105-605: The Volkswagen Zwickau-Mosel Plant (German: Volkswagenwerk Zwickau ) is an automobile factory in today's Zwickau district of Mosel , Germany. Founded on 26 September 1990, together with the Chemnitz plant and the Transparent Factory , it belongs to Volkswagen Sachsen , based in Zwickau. Currently (as of spring 2019), the Zwickau plant has about 8,000 employees. Signalling a milestone the last combustion vehicle
210-433: A carburetor or fuel injection as port injection or direct injection . Most SI engines have a single spark plug per cylinder but some have 2 . A head gasket prevents the gas from leaking between the cylinder head and the engine block. The opening and closing of the valves is controlled by one or several camshafts and springs—or in some engines—a desmodromic mechanism that uses no springs. The camshaft may press directly
315-409: A deflector head . Pistons are open at the bottom and hollow except for an integral reinforcement structure (the piston web). When an engine is working, the gas pressure in the combustion chamber exerts a force on the piston crown which is transferred through its web to a gudgeon pin . Each piston has rings fitted around its circumference that mostly prevent the gases from leaking into the crankcase or
420-428: A gas engine . Also in 1794, Robert Street patented an internal combustion engine, which was also the first to use liquid fuel , and built an engine around that time. In 1798, John Stevens built the first American internal combustion engine. In 1807, French engineers Nicéphore Niépce (who went on to invent photography ) and Claude Niépce ran a prototype internal combustion engine, using controlled dust explosions,
525-470: A locomotive operated by electricity.) In boating, an internal combustion engine that is installed in the hull is referred to as an engine, but the engines that sit on the transom are referred to as motors. Reciprocating piston engines are by far the most common power source for land and water vehicles , including automobiles , motorcycles , ships and to a lesser extent, locomotives (some are electrical but most use diesel engines ). Rotary engines of
630-594: A battery and charging system; nevertheless, this system is secondary and is added by manufacturers as a luxury for the ease of starting, turning fuel on and off (which can also be done via a switch or mechanical apparatus), and for running auxiliary electrical components and accessories. Most new engines rely on electrical and electronic engine control units (ECU) that also adjust the combustion process to increase efficiency and reduce emissions. Surfaces in contact and relative motion to other surfaces require lubrication to reduce wear, noise and increase efficiency by reducing
735-404: A carefully timed high-voltage to the proper cylinder. This spark, via the spark plug, ignites the air-fuel mixture in the engine's cylinders. While gasoline internal combustion engines are much easier to start in cold weather than diesel engines, they can still have cold weather starting problems under extreme conditions. For years, the solution was to park the car in heated areas. In some parts of
840-499: A common power source for lawnmowers , string trimmers , chain saws , leafblowers , pressure washers , snowmobiles , jet skis , outboard motors , mopeds , and motorcycles . There are several possible ways to classify internal combustion engines. By number of strokes: By type of ignition: By mechanical/thermodynamic cycle (these cycles are infrequently used but are commonly found in hybrid vehicles , along with other vehicles manufactured for fuel efficiency ): The base of
945-617: A form of internal combustion engine, though of a type so specialized that they are commonly treated as a separate category, along with weaponry such as mortars and anti-aircraft cannons.) In contrast, in external combustion engines , such as steam or Stirling engines , energy is delivered to a working fluid not consisting of, mixed with, or contaminated by combustion products. Working fluids for external combustion engines include air, hot water, pressurized water or even boiler -heated liquid sodium . While there are many stationary applications, most ICEs are used in mobile applications and are
1050-452: A hand crank. Larger engines typically power their starting motors and ignition systems using the electrical energy stored in a lead–acid battery . The battery's charged state is maintained by an automotive alternator or (previously) a generator which uses engine power to create electrical energy storage. The battery supplies electrical power for starting when the engine has a starting motor system, and supplies electrical power when
1155-408: A problem would occur as the compression ratio increased as the fuel was igniting due to the rise in temperature that resulted. Charles Kettering developed a lead additive which allowed higher compression ratios, which was progressively abandoned for automotive use from the 1970s onward, partly due to lead poisoning concerns. The fuel mixture is ignited at different progressions of the piston in
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#17327876347171260-731: A reciprocating internal combustion engine is the engine block , which is typically made of cast iron (due to its good wear resistance and low cost) or aluminum . In the latter case, the cylinder liners are made of cast iron or steel, or a coating such as nikasil or alusil . The engine block contains the cylinders . In engines with more than one cylinder they are usually arranged either in 1 row ( straight engine ) or 2 rows ( boxer engine or V engine ); 3 or 4 rows are occasionally used ( W engine ) in contemporary engines, and other engine configurations are possible and have been used. Single-cylinder engines (or thumpers ) are common for motorcycles and other small engines found in light machinery. On
1365-422: A separate ICE as an auxiliary power unit . Wankel engines are fitted to many unmanned aerial vehicles . ICEs drive large electric generators that power electrical grids. They are found in the form of combustion turbines with a typical electrical output in the range of some 100 MW. Combined cycle power plants use the high temperature exhaust to boil and superheat water steam to run a steam turbine . Thus,
1470-481: A separate blower avoids many of the shortcomings of crankcase scavenging, at the expense of increased complexity which means a higher cost and an increase in maintenance requirement. An engine of this type uses ports or valves for intake and valves for exhaust, except opposed piston engines , which may also use ports for exhaust. The blower is usually of the Roots-type but other types have been used too. This design
1575-416: A separate crankcase ventilation system. The cylinder head is attached to the engine block by numerous bolts or studs . It has several functions. The cylinder head seals the cylinders on the side opposite to the pistons; it contains short ducts (the ports ) for intake and exhaust and the associated intake valves that open to let the cylinder be filled with fresh air and exhaust valves that open to allow
1680-405: Is a fly-back system, using interruption of electrical primary system current through some type of synchronized interrupter. The interrupter can be either contact points or a power transistor. The problem with this type of ignition is that as RPM increases the availability of electrical energy decreases. This is especially a problem, since the amount of energy needed to ignite a more dense fuel mixture
1785-543: Is also a factory of the supplier GKN Driveline , which operates out of the old VEB Saschenring part of the plant that was constructed in the late 1970 to manufacture Trabants. In 2019 the factory was completely converted to the production of electric cars . The last internal combustion engine (ICE) vehicle rolled off the Zwickau plant on 26 June 2020. The car is a seventh generation Golf R Estate with 2.0-litre petrol engine in Oryx White Pearl Effect. It
1890-421: Is also why diesel and HCCI engines are more susceptible to cold-starting issues, although they run just as well in cold weather once started. Light duty diesel engines with indirect injection in automobiles and light trucks employ glowplugs (or other pre-heating: see Cummins ISB#6BT ) that pre-heat the combustion chamber just before starting to reduce no-start conditions in cold weather. Most diesels also have
1995-503: Is commonplace in CI engines, and has been occasionally used in SI engines. CI engines that use a blower typically use uniflow scavenging . In this design the cylinder wall contains several intake ports placed uniformly spaced along the circumference just above the position that the piston crown reaches when at BDC. An exhaust valve or several like that of 4-stroke engines is used. The final part of
2100-542: Is driven downward with power, it first uncovers the exhaust port where the burned fuel is expelled under high pressure and then the intake port where the process has been completed and will keep repeating. Later engines used a type of porting devised by the Deutz company to improve performance. It was called the Schnurle Reverse Flow system. DKW licensed this design for all their motorcycles. Their DKW RT 125
2205-415: Is held in place relative to the engine block by main bearings , which allow it to rotate. Bulkheads in the crankcase form a half of every main bearing; the other half is a detachable cap. In some cases a single main bearing deck is used rather than several smaller caps. A connecting rod is connected to offset sections of the crankshaft (the crankpins ) in one end and to the piston in the other end through
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#17327876347172310-406: Is higher. The result was often a high RPM misfire. Capacitor discharge ignition was developed. It produces a rising voltage that is sent to the spark plug. CD system voltages can reach 60,000 volts. CD ignitions use step-up transformers . The step-up transformer uses energy stored in a capacitance to generate electric spark . With either system, a mechanical or electrical control system provides
2415-445: Is not possible to dedicate a stroke exclusively for each of them. Starting at TDC the cycle consists of: While a 4-stroke engine uses the piston as a positive displacement pump to accomplish scavenging taking 2 of the 4 strokes, a 2-stroke engine uses the last part of the power stroke and the first part of the compression stroke for combined intake and exhaust. The work required to displace the charge and exhaust gases comes from either
2520-514: Is the Wärtsilä-Sulzer RTA96-C turbocharged 2-stroke diesel, used in large container ships. It is the most efficient and powerful reciprocating internal combustion engine in the world with a thermal efficiency over 50%. For comparison, the most efficient small four-stroke engines are around 43% thermally-efficient (SAE 900648); size is an advantage for efficiency due to the increase in the ratio of volume to surface area. See
2625-686: Is the 9,512,001th ICE vehicle produced in the plant, effectively ended 116 years of ICE vehicle assembly in Zwickau-Mosel. Production of the Audi Q4 e-tron began at the plant in 2021, marking the first time that Audis have been manufactured in Zwickau in the post-war period. 50°47′36″N 12°29′14″E / 50.79333°N 12.48722°E / 50.79333; 12.48722 Zwickau Zwickau ( German pronunciation: [ˈtsvɪkaʊ] ; Upper Sorbian : Šwikawa ; Czech : Cvikov or Zvíkov ; Polish : Ćwików )
2730-466: Is the birthplace of composer Robert Schumann . Zwickau has historically been one of the centres of the German automotive industry. It is the cradle of Audi and its forerunner Horch . Horchwerke AG Zwickau was founded there in 1904 and was renamed to Audiwerke Zwickau AG in 1909. Zwickau was also the seat of VEB Sachsenring (now Sachsenring GmbH), which produced East Germany 's most popular car,
2835-518: Is the fourth-largest city of Saxony , Germany, after Leipzig , Dresden and Chemnitz , with around 88,000 inhabitants,. The West Saxon city is situated in the valley of the Zwickau Mulde (German: Zwickauer Mulde ; progression: Mulde → Elbe → North Sea ), and lies in a string of cities sitting in the densely populated foreland of the Elster and Ore Mountains stretching from Plauen in
2940-459: Is used to propel, move or power whatever the engine is attached to. The first commercially successful internal combustion engine was created by Étienne Lenoir around 1860, and the first modern internal combustion engine, known as the Otto engine , was created in 1876 by Nicolaus Otto . The term internal combustion engine usually refers to an engine in which combustion is intermittent , such as
3045-704: The Audi Q4 e-tron began at the Zwickau-Mosel plant, marking the return of the manufacture of Audi badged cars in Zwickau for the first time in over 80 years. Two major industrial facilities of the Soviet SDAG Wismut were situated in the city: the uranium mill in Zwickau-Crossen, producing uranium concentrate from ores mined in the Erzgebirge and Thuringia, and the machine building plant in Zwickau-Cainsdorf producing equipment for
3150-911: The Czarny Legion [ pl ] Polish underground resistance organization from Gostyń was held in Zwickau, after which 12 members were executed in Dresden , and several dozen were imprisoned in Nazi concentration camps , where 37 of them died. In May 1942, five Polish students of the Salesian Oratory in Poznań , known as the Poznań Five [ pl ] or five of the 108 Blessed Polish Martyrs of World War II , were imprisoned in Zwickau, before being executed in Dresden. A subcamp of
3255-562: The Czech Republic . The core element of Zwickau's urban public transport system is the Zwickau tramway network ; the system is also the prototype of the so-called Zwickau Model for such systems. The closest airport is Leipzig-Altenburg , which has no scheduled commercial flights. The nearest major airports are Leipzig/Halle Airport and Dresden Airport , both of which offer a large number of national and international flights. In
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3360-473: The European Route of Industrial Heritage (EIRH). Zwickau is twinned with: Internal combustion engine An internal combustion engine ( ICE or IC engine ) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of
3465-613: The Flossenbürg concentration camp was located in Zwickau, whose prisoners were mostly Poles and Russians, but also Italians, French, Hungarians, Jews, Czechs, Germans and others. On 17 April 1945, US troops entered the city. They withdrew on 30 June 1945 and handed Zwickau to the Soviet Red Army . Between 1944 and 2003, the city had a population of over 100,000. A major employer is Volkswagen which assembles its ID.3, ID.4 and ID.5 models, as well as Audi and Cupra EV's in
3570-472: The Gothic church of St. Mary (1451–1536), with a spire 285 ft (87 m) high and a bell weighing 51 tons . The church contains an altar with wood carvings, eight paintings by Michael Wohlgemuth and a pietà in carved and painted wood by Peter Breuer . The late Gothic church of St. Catharine has an altar piece ascribed to Lucas Cranach the elder , and is remembered because Thomas Müntzer
3675-529: The Horch automobile plant was founded, followed by the Audi factory in 1909. In 1932 both brands were incorporated into Auto Union but retained their independent trademarks. Auto Union racing cars , developed by Ferdinand Porsche and Robert Eberan von Eberhorst , driven by Bernd Rosemeyer , Hans Stuck , Tazio Nuvolari , Ernst von Delius , became well known nationally and internationally. During World War II,
3780-618: The Pyréolophore , which was granted a patent by Napoleon Bonaparte . This engine powered a boat on the Saône river in France. In the same year, Swiss engineer François Isaac de Rivaz invented a hydrogen-based internal combustion engine and powered the engine by electric spark. In 1808, De Rivaz fitted his invention to a primitive working vehicle – "the world's first internal combustion powered automobile". In 1823, Samuel Brown patented
3885-737: The Trabant , in Zwickau. Since 1990, there is a large Volkswagen plant in Zwickau-Mosel . The 167-kilometre (104-mile)-long Zwickau Mulde River, originating in Schöneck/Vogtl. in the Western Ore Mountains , traverses the city in a south to north direction. It enters Zwickau between Zwickau-Cainsdorf and Zwickau-Bockwa, and leaves at Zwickau-Schlunzig near the Volkswagen plant, and is spanned by 17 bridges within
3990-473: The external links for an in-cylinder combustion video in a 2-stroke, optically accessible motorcycle engine. Dugald Clerk developed the first two-cycle engine in 1879. It used a separate cylinder which functioned as a pump in order to transfer the fuel mixture to the cylinder. In 1899 John Day simplified Clerk's design into the type of 2 cycle engine that is very widely used today. Day cycle engines are crankcase scavenged and port timed. The crankcase and
4095-551: The "Friemann & Wolf" factory. Coal mining ceased in 1978. About 230 million tonnes had been mined to a depth of over 1,000 metres. In 1992 Zwickau's last coke oven plant was closed. Many industrial branches developed in the city in the wake of the coal mining industry: mining equipment, iron and steel works, textile, machinery in addition to chemical, porcelain, paper, glass, dyestuffs, wire goods, tinware, stockings, and curtains. There were also steam saw-mills, diamond and glass polishing works, iron-foundries, and breweries. In 1904
4200-574: The 13th century. Zwickau was a free imperial city from 1290 to 1323, but was subsequently granted to the Margraviate of Meissen . Although regional mining began in 1316, extensive mining increased with the discovery of silver in the Schneeberg in 1470. Because of the silver ore deposits in the Erzgebirge, Zwickau developed in the 15th and 16th centuries and grew to be an important economic and cultural centre of Saxony. Its nine churches include
4305-619: The 7th century AD. The name Zwickau is probably a Germanization of the Sorbian toponym Šwikawa , which derives from Svarozič , the Slavic Sun and fire god. In the 10th century, German settlers began arriving and the native Slavs were Germanized. A trading place known as terretorio Zcwickaw (in Medieval Latin ) was mentioned in 1118. The settlement received a town charter in 1212, and hosted Franciscans and Cistercians during
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4410-700: The Nazi government operated a satellite camp of the Flossenbürg concentration camp in Zwickau which was sited near the Horch Auto Union plant. The Nazi administration built a hard labour prison camp at Osterstein Castle . Both camps were liberated by the US Army in 1945. On 1 August 1945 military administration was handed over to the Soviet Army. The Auto Union factories of Horch and Audi were dismantled by
4515-650: The Phaeton and Bentley Continental series (50,000 each). Since 2017, bodies for the Bentley Bentayga and since 2018 bodies for the Lamborghini Urus have been produced at the Zwickau plant. On 11 May 2004 the festive event for the 100th anniversary of the founding of Horch. High-ranking persons from politics and economics appreciated the scientific and technical achievements of the car makers from southwest Saxony in their greetings. Directly adjacent
4620-822: The Reformation. In 1520 Martin Luther dedicated his treatise "On the Freedom of the Christian Man" to his friend Hermann Muehlpfort, the Lord Mayor of Zwickau. The Anabaptist movement of 1525 began at Zwickau under the inspiration of the " Zwickau prophets ". After Wittenberg, it became the first city in Europe to join the Lutheran Reformation . The late Gothic Gewandhaus (cloth merchants' hall),
4725-827: The Soviets; Auto Union relocated to Ingolstadt , Bavaria, evolving into the present day Audi company. In 1948 all large companies were seized by the East German government. With the founding of the German Democratic Republic in 1949 in East Germany, post-war reconstruction began. In 1958 the Horch and Audi factories were merged into the Sachsenring plant. At the Sachsenring automotive plant
4830-536: The VW model series Golf and Passat left the production lines of the Volkswagen plant every day. With 250,000 vehicles, 2010 was a record result. In addition, there are the bodies for the luxury class vehicles Phaeton and Bentley Continental GT , which are completely painted with special transporters in the " Transparent Factory " Dresden or after Crewe in England. Since 2001, around 100,000 bodies have been produced for
4935-619: The Wankel design are used in some automobiles, aircraft and motorcycles. These are collectively known as internal-combustion-engine vehicles (ICEV). Where high power-to-weight ratios are required, internal combustion engines appear in the form of combustion turbines , or sometimes Wankel engines. Powered aircraft typically use an ICE which may be a reciprocating engine. Airplanes can instead use jet engines and helicopters can instead employ turboshafts ; both of which are types of turbines. In addition to providing propulsion, aircraft may employ
5040-478: The Zwickau-Mosel vehicle plant. Coal mining is mentioned as early as 1348. However, mining on an industrial scale first started in the early 19th century. The coal mines of Zwickau and the neighbouring Oelsnitz-Lugau coalfield contributed significantly to the industrialisation of the region and the city. In 1885 Carl Wolf invented an improved gas-detecting safety mining-lamp. He held the first world patent for it. Together with his business partner Friemann he founded
5145-489: The associated process. While an engine is in operation, the crankshaft rotates continuously at a nearly constant speed . In a 4-stroke ICE, each piston experiences 2 strokes per crankshaft revolution in the following order. Starting the description at TDC, these are: The defining characteristic of this kind of engine is that each piston completes a cycle every crankshaft revolution. The 4 processes of intake, compression, power and exhaust take place in only 2 strokes so that it
5250-492: The automobile industry. The former VEB Sachsenring manufacturing site was acquired by Volkswagen in 1990 and has since been redeveloped as an engine and transmission manufacturing facility. Nowadays the headquarters of Volkswagen-Saxony Ltd. (a VW subsidiary) is in the northern part of Zwickau. Audi together with the city of Zwickau operates the August Horch Museum in the former Audi works. In 2021, production of
5355-578: The centre of Zwickau being largely demolished - only the historic Audi factory building was retained and now houses the August Horch Museum Zwickau . The new expanded manufacturing plant was completed in 1993. The suburb Mosel was incorporated into Zwickau on 1 January 1999. In 2007, they officially introduced the new factory designation Volkswagen-Fahrzeugwerk Zwickau . Since production began in 1990, around 6 million Volkswagen vehicles have been delivered. In 2010, 1,350 vehicles of
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#17327876347175460-482: The city and the nearby Ore Mountains . Zwickau is the birthplace of the composer Robert Schumann . The house where he was born in 1810 still stands in the marketplace. This is now called Robert Schumann House and is a museum dedicated to him. The histories of the Audi and Horch automobile factories are presented at the August Horch Museum Zwickau . The museum is an Anchor Point of
5565-473: The city centre there are three museums: an art museum from the 19th century and the houses of priests from 13th century, both located next to St. Mary's church. Just around the corner there is the Robert-Schumann museum. The museums offer different collections dedicated to the history of the city, as well as art and a mineralogical, palaeontological and geological collection with many specimens from
5670-825: The city of Glauchau . Zwickau is home to the University of Applied Sciences Zwickau , with about 4,700 students and two campuses within the boundaries of Zwickau. Dr. Martin Luther School (German: Dr. Martin Luther Schule ) is a grade 1–4 school of the Evangelical Lutheran Free Church in Zwickau. The first freely elected mayor after German reunification was Rainer Eichhorn of the Christian Democratic Union (CDU), who served from 1990 to 2001. The mayor
5775-477: The city. The Silver Road , Saxony's longest tourist route, connects Dresden with Zwickau. Zwickau can be reached by car via the nearby Autobahn s A4 and A72 , the main railway station ( Zwickau Hauptbahnhof ), via a public airfield which takes light aircraft, and by bike along the Zwickau Mulde River on the so-called Mulderadweg. The region around Zwickau was settled by Sorbs as early as
5880-619: The combustion gases to escape. The valves are often poppet valves but they can also be rotary valves or sleeve valves . However, 2-stroke crankcase scavenged engines connect the gas ports directly to the cylinder wall without poppet valves; the piston controls their opening and occlusion instead. The cylinder head also holds the spark plug in the case of spark ignition engines and the injector for engines that use direct injection. All CI (compression ignition) engines use fuel injection, usually direct injection but some engines instead use indirect injection . SI (spark ignition) engines can use
5985-460: The compact Trabant cars were manufactured. These small cars had a two-cylinder, two-stroke engine. The car was the first vehicle in the world to be industrially manufactured with a plastic car body. The production of the Trabant was discontinued after German reunification, but Volkswagen built a new factory in the nearby Mosel area to the north of the city and Sachsenring is now a supplier for
6090-455: The compressed air and combustion products and slide continuously within it while the engine is in operation. In smaller engines, the pistons are made of aluminum; while in larger applications, they are typically made of cast iron. In performance applications, pistons can also be titanium or forged steel for greater strength. The top surface of the piston is called its crown and is typically flat or concave. Some two-stroke engines use pistons with
6195-432: The compressed charge, four-cycle engine. In 1879, Karl Benz patented a reliable two-stroke gasoline engine. Later, in 1886, Benz began the first commercial production of motor vehicles with an internal combustion engine, in which a three-wheeled, four-cycle engine and chassis formed a single unit. In 1892, Rudolf Diesel developed the first compressed charge, compression ignition engine. In 1926, Robert Goddard launched
6300-410: The corresponding ports. The intake manifold connects to the air filter directly, or to a carburetor when one is present, which is then connected to the air filter . It distributes the air incoming from these devices to the individual cylinders. The exhaust manifold is the first component in the exhaust system . It collects the exhaust gases from the cylinders and drives it to the following component in
6405-400: The crankcase or a separate blower. For scavenging, expulsion of burned gas and entry of fresh mix, two main approaches are described: Loop scavenging, and Uniflow scavenging. SAE news published in the 2010s that 'Loop Scavenging' is better under any circumstance than Uniflow Scavenging. Some SI engines are crankcase scavenged and do not use poppet valves. Instead, the crankcase and the part of
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#17327876347176510-401: The crankcase pressure is slightly below intake pressure, to let it be filled with a new charge; this happens when the piston is moving upwards. When the piston is moving downwards the pressure in the crankcase increases and the reed valve closes promptly, then the charge in the crankcase is compressed. When the piston is moving downwards, it also uncovers the exhaust port and the transfer port and
6615-413: The crankcase to the port in the cylinder to provide for intake and another from the exhaust port to the exhaust pipe. The height of the port in relationship to the length of the cylinder is called the "port timing". On the first upstroke of the engine there would be no fuel inducted into the cylinder as the crankcase was empty. On the downstroke, the piston now compresses the fuel mix, which has lubricated
6720-431: The cylinder below the piston is used as a pump. The intake port is connected to the crankcase through a reed valve or a rotary disk valve driven by the engine. For each cylinder, a transfer port connects in one end to the crankcase and in the other end to the cylinder wall. The exhaust port is connected directly to the cylinder wall. The transfer and exhaust port are opened and closed by the piston. The reed valve opens when
6825-411: The cylinder block has fins protruding away from it to cool the engine by directly transferring heat to the air. The cylinder walls are usually finished by honing to obtain a cross hatch , which is able to retain more oil. A too rough surface would quickly harm the engine by excessive wear on the piston. The pistons are short cylindrical parts which seal one end of the cylinder from the high pressure of
6930-407: The cylinder. Because there is no obstruction in the cylinder of the fuel to move directly out of the exhaust port prior to the piston rising far enough to close the port, early engines used a high domed piston to slow down the flow of fuel. Later the fuel was "resonated" back into the cylinder using an expansion chamber design. When the piston rose close to TDC, a spark ignited the fuel. As the piston
7035-414: The cylinder. At low rpm, the spark is timed to occur close to the piston achieving top dead center. In order to produce more power, as rpm rises the spark is advanced sooner during piston movement. The spark occurs while the fuel is still being compressed progressively more as rpm rises. The necessary high voltage, typically 10,000 volts, is supplied by an induction coil or transformer. The induction coil
7140-413: The early engines which used Hot Tube ignition. When Bosch developed the magneto it became the primary system for producing electricity to energize a spark plug. Many small engines still use magneto ignition. Small engines are started by hand cranking using a recoil starter or hand crank. Prior to Charles F. Kettering of Delco's development of the automotive starter all gasoline engined automobiles used
7245-453: The efficiency is higher because more energy is extracted from the fuel than what could be extracted by the combustion engine alone. Combined cycle power plants achieve efficiencies in the range of 50–60%. In a smaller scale, stationary engines like gas engines or diesel generators are used for backup or for providing electrical power to areas not connected to an electric grid . Small engines (usually 2‐stroke gasoline/petrol engines) are
7350-543: The engine is off. The battery also supplies electrical power during rare run conditions where the alternator cannot maintain more than 13.8 volts (for a common 12 V automotive electrical system). As alternator voltage falls below 13.8 volts, the lead-acid storage battery increasingly picks up electrical load. During virtually all running conditions, including normal idle conditions, the alternator supplies primary electrical power. Some systems disable alternator field (rotor) power during wide-open throttle conditions. Disabling
7455-435: The field reduces alternator pulley mechanical loading to nearly zero, maximizing crankshaft power. In this case, the battery supplies all primary electrical power. Gasoline engines take in a mixture of air and gasoline and compress it by the movement of the piston from bottom dead center to top dead center when the fuel is at maximum compression. The reduction in the size of the swept area of the cylinder and taking into account
7560-671: The first internal combustion engine to be applied industrially. In 1854, in the UK, the Italian inventors Eugenio Barsanti and Felice Matteucci obtained the certification: "Obtaining Motive Power by the Explosion of Gases". In 1857 the Great Seal Patent Office conceded them patent No.1655 for the invention of an "Improved Apparatus for Obtaining Motive Power from Gases". Barsanti and Matteucci obtained other patents for
7665-595: The first liquid-fueled rocket. In 1939, the Heinkel He 178 became the world's first jet aircraft . At one time, the word engine (via Old French , from Latin ingenium , "ability") meant any piece of machinery —a sense that persists in expressions such as siege engine . A "motor" (from Latin motor , "mover") is any machine that produces mechanical power . Traditionally, electric motors are not referred to as "engines"; however, combustion engines are often referred to as "motors". (An electric engine refers to
7770-604: The following conditions: The main advantage of 2-stroke engines of this type is mechanical simplicity and a higher power-to-weight ratio than their 4-stroke counterparts. Despite having twice as many power strokes per cycle, less than twice the power of a comparable 4-stroke engine is attainable in practice. In the US, 2-stroke engines were banned for road vehicles due to the pollution. Off-road only motorcycles are still often 2-stroke but are rarely road legal. However, many thousands of 2-stroke lawn maintenance engines are in use. Using
7875-517: The gudgeon pin and thus transfers the force and translates the reciprocating motion of the pistons to the circular motion of the crankshaft. The end of the connecting rod attached to the gudgeon pin is called its small end, and the other end, where it is connected to the crankshaft, the big end. The big end has a detachable half to allow assembly around the crankshaft. It is kept together to the connecting rod by removable bolts. The cylinder head has an intake manifold and an exhaust manifold attached to
7980-505: The high temperature and pressure created by the engine in its compression process. The compression level that occurs is usually twice or more than a gasoline engine. Diesel engines take in air only, and shortly before peak compression, spray a small quantity of diesel fuel into the cylinder via a fuel injector that allows the fuel to instantly ignite. HCCI type engines take in both air and fuel, but continue to rely on an unaided auto-combustion process, due to higher pressures and temperature. This
8085-399: The high- temperature and high- pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons ( piston engine ), turbine blades ( gas turbine ), a rotor (Wankel engine) , or a nozzle ( jet engine ). This force moves the component over a distance. This process transforms chemical energy into kinetic energy which
8190-416: The higher pressure of the charge in the crankcase makes it enter the cylinder through the transfer port, blowing the exhaust gases. Lubrication is accomplished by adding two-stroke oil to the fuel in small ratios. Petroil refers to the mix of gasoline with the aforesaid oil. This kind of 2-stroke engine has a lower efficiency than comparable 4-strokes engines and releases more polluting exhaust gases for
8295-451: The highest thermal efficiencies among internal combustion engines of any kind. Some diesel–electric locomotive engines operate on the 2-stroke cycle. The most powerful of them have a brake power of around 4.5 MW or 6,000 HP . The EMD SD90MAC class of locomotives are an example of such. The comparable class GE AC6000CW , whose prime mover has almost the same brake power, uses a 4-stroke engine. An example of this type of engine
8400-419: The intake manifold is an air sleeve that feeds the intake ports. The intake ports are placed at a horizontal angle to the cylinder wall (I.e: they are in plane of the piston crown) to give a swirl to the incoming charge to improve combustion. The largest reciprocating IC are low speed CI engines of this type; they are used for marine propulsion (see marine diesel engine ) or electric power generation and achieve
8505-429: The inventor of the diesel engine, Rudolf Diesel , was using peanut oil to run his engines. Renewable fuels are commonly blended with fossil fuels. Hydrogen , which is rarely used, can be obtained from either fossil fuels or renewable energy. Various scientists and engineers contributed to the development of internal combustion engines. In 1791, John Barber developed the gas turbine . In 1794 Thomas Mead patented
8610-453: The modern Audi company evolved. VEB Sachsenring was established by the DDR in the 1950s to manufacture a national automobile - the Trabant - out of the former Auto Union works. Between 1978 and 1982, VEB Saschenring constructed a new factory on the outskirts of Zwickau in nearby Mosel, as the old facilities had increasingly become inadequate. Due to the traditions of automotive engineering in
8715-454: The more familiar two-stroke and four-stroke piston engines, along with variants, such as the six-stroke piston engine and the Wankel rotary engine . A second class of internal combustion engines use continuous combustion: gas turbines , jet engines and most rocket engines , each of which are internal combustion engines on the same principle as previously described. ( Firearms are also
8820-407: The oil into the combustion chamber. A ventilation system drives the small amount of gas that escapes past the pistons during normal operation (the blow-by gases) out of the crankcase so that it does not accumulate contaminating the oil and creating corrosion. In two-stroke gasoline engines the crankcase is part of the air–fuel path and due to the continuous flow of it, two-stroke engines do not need
8925-402: The outer side of the cylinder, passages that contain cooling fluid are cast into the engine block whereas, in some heavy duty engines, the passages are the types of removable cylinder sleeves which can be replaceable. Water-cooled engines contain passages in the engine block where cooling fluid circulates (the water jacket ). Some small engines are air-cooled, and instead of having a water jacket
9030-460: The part of the cylinder below the exhaust port is used as a pump. The operation of the Day cycle engine begins when the crankshaft is turned so that the piston moves from BDC upward (toward the head) creating a vacuum in the crankcase/cylinder area. The carburetor then feeds the fuel mixture into the crankcase through a reed valve or a rotary disk valve (driven by the engine). There are cast in ducts from
9135-427: The path. The exhaust system of an ICE may also include a catalytic converter and muffler . The final section in the path of the exhaust gases is the tailpipe . The top dead center (TDC) of a piston is the position where it is nearest to the valves; bottom dead center (BDC) is the opposite position where it is furthest from them. A stroke is the movement of a piston from TDC to BDC or vice versa, together with
9240-412: The piston in the cylinder and the bearings due to the fuel mix having oil added to it. As the piston moves downward it first uncovers the exhaust, but on the first stroke there is no burnt fuel to exhaust. As the piston moves downward further, it uncovers the intake port which has a duct that runs to the crankcase. Since the fuel mix in the crankcase is under pressure, the mix moves through the duct and into
9345-409: The power wasting in overcoming friction , or to make the mechanism work at all. Also, the lubricant used can reduce excess heat and provide additional cooling to components. At the very least, an engine requires lubrication in the following parts: In 2-stroke crankcase scavenged engines, the interior of the crankcase, and therefore the crankshaft, connecting rod and bottom of the pistons are sprayed by
9450-403: The primary power supply for vehicles such as cars , aircraft and boats . ICEs are typically powered by hydrocarbon -based fuels like natural gas , gasoline , diesel fuel , or ethanol . Renewable fuels like biodiesel are used in compression ignition (CI) engines and bioethanol or ETBE (ethyl tert-butyl ether) produced from bioethanol in spark ignition (SI) engines. As early as 1900
9555-632: The region and because of the skilled workers potential, Volkswagen decided as the first large enterprise of the Federal Republic to build up a completely new plant in Saxony and provided for it considerable investments. As a result, other investors settled in the region. Already in the final phase of the GDR the Trabant 1.1 was built in the newer Mosel plant from 1989 with a four-cylinder four-stroke engine manufactured under VW license. The production
9660-452: The same invention in France, Belgium and Piedmont between 1857 and 1859. In 1860, Belgian engineer Jean Joseph Etienne Lenoir produced a gas-fired internal combustion engine. In 1864, Nicolaus Otto patented the first atmospheric gas engine. In 1872, American George Brayton invented the first commercial liquid-fueled internal combustion engine. In 1876, Nicolaus Otto began working with Gottlieb Daimler and Wilhelm Maybach , patented
9765-552: The southwest via Zwickau, Chemnitz and Freiberg to Dresden in the northeast. Zwickau is the seat of the Zwickau District , the most densely populated district in the new states of Germany . Zwickau is the seat of the West Saxon University of Zwickau (German: Westsächsische Hochschule Zwickau ) with campuses in Zwickau, Markneukirchen , Reichenbach im Vogtland and Schneeberg (Erzgebirge) . The city
9870-400: The stem of the valve or may act upon a rocker arm , again, either directly or through a pushrod . The crankcase is sealed at the bottom with a sump that collects the falling oil during normal operation to be cycled again. The cavity created between the cylinder block and the sump houses a crankshaft that converts the reciprocating motion of the pistons to rotational motion. The crankshaft
9975-452: The uranium mines and mills of East Germany. Uranium milling ended in 1989, and after the unification the Wismut machine building plant was sold to a private investor. Zwickau is bounded by Mülsen , Reinsdorf , Wilkau-Hasslau , Hirschfeld ( Verwaltungsgemeinschaft Kirchberg ), Lichtentanne , Werdau , Neukirchen , Crimmitschau , Dennheritz ( Verwaltungsgemeinschaft Crimmitschau ), and
10080-423: The volume of the combustion chamber is described by a ratio. Early engines had compression ratios of 6 to 1. As compression ratios were increased, the efficiency of the engine increased as well. With early induction and ignition systems the compression ratios had to be kept low. With advances in fuel technology and combustion management, high-performance engines can run reliably at 12:1 ratio. With low octane fuel,
10185-627: The winter sports areas around Johanngeorgenstadt and the Vogtland. In the Old Town the Cathedral and the Gewandhaus (cloth merchants' hall) originate in the 16th century and when Schneeberg silver was traded. In the 19th century the city's economy was driven by industrial coal mining and later by automobile manufacturing. During World War II , in 1942, a Nazi show trial of the members of
10290-549: The world, the oil was actually drained and heated overnight and returned to the engine for cold starts. In the early 1950s, the gasoline Gasifier unit was developed, where, on cold weather starts, raw gasoline was diverted to the unit where part of the fuel was burned causing the other part to become a hot vapor sent directly to the intake valve manifold. This unit was quite popular until electric engine block heaters became standard on gasoline engines sold in cold climates. For ignition, diesel, PPC and HCCI engines rely solely on
10395-637: Was built in 1522–24 and is now converted into a theatre. The city was seriously damaged during the Thirty Years' War . The old city of Zwickau, perched on a hill, is surrounded by heights with extensive forests and a municipal park. Near the city are the Hartenstein area, for example, with Stein and Wolfsbrunn castles and the Prinzenhöhle cave, as well as the Auersberg peak (1019 meters) and
10500-655: Was discontinued in 1991, because parallel to this one the mass production of the Volkswagen Polo Mk2 had already started on 21 May 1990 in the Mosel factory. On 15 February 1991, the production of the Volkswagen Golf Mk2 began parallel to the Polo production. Volkswagen also began construction of a major expansion of the Mosel plant following the unification of Germany , with he old Saschenring site in
10605-597: Was elected. The most recent city council election was held on 9 June 2024, and the results were as follows: The city is close to the A4 (Dresden-Erfurt) and A72 (Hof-Chemnitz) Autobahn s. Zwickau Hauptbahnhof is on the Dresden–Werdau line , part of the Saxon-Franconian trunk line , connecting Nuremberg and Dresden. There are further railway connections to Leipzig as well as Karlovy Vary and Cheb in
10710-616: Was once pastor there (1520–22). The city hall was begun in 1404 and rebuilt many times since. The municipal archives include documents dating back to the 13th century. Early printed books from the Middle Ages, historical documents, letters and books are kept in the City Archives (e.g. Meister Singer volumes by Hans Sachs (1494–1576)), and in the School Library founded by scholars and by the city clerk Stephan Roth during
10815-405: Was one of the first motor vehicles to achieve over 100 mpg as a result. Internal combustion engines require ignition of the mixture, either by spark ignition (SI) or compression ignition (CI) . Before the invention of reliable electrical methods, hot tube and flame methods were used. Experimental engines with laser ignition have been built. The spark-ignition engine was a refinement of
10920-524: Was originally chosen by the city council, but since 1994 has been directly elected. Dietmar Vettermann , also of the CDU, served from 2001 until 2008. He was succeeded by Pia Findeiß of the Social Democratic Party (SPD), who was in office until 2020. The most recent mayoral election was held on 20 September 2020, with a runoff held on 11 October, at which Constance Arndt (Bürger für Zwickau)
11025-671: Was produced on 26 June 2020. With the founding of Horch and Audi in 1904 and 1909 respectively, Zwickau became the cradle of the Saxon automobile industry. Following the partition of Germany after the Second World War , and the formation of East Germany (DDR), all private enterprise was seized by the government, which included the former Audi and Horch factories in Zwickau, with their parent Auto Union formally relocating to Ingolstadt in West Germany in 1949, from where
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