Transcription of Internal Combustion Engines
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Internal Combustion Engines
4 InternalCombustionEnginesInternalcombust ionenginesaredevicesthatgenerateworkusin gtheproductsofcom-bustionastheworkingflu idratherthanasa ,thecombustionis carriedoutina mannerthatproduceshigh-pressurecombustio nprod-uctsthatcanbeexpandedthrougha introducesa :(1)thesparkignitionengine,whichisusedpr imarilyinautomobiles;(2)thedieselengine, whichisusedinlargevehiclesandindustrials ystemswheretheimprovementsincycleefficie ncymakeitadvantageousoverthemorecompacta ndlighter-weightsparkignitionengine;and( 3)thegasturbine, ,unburnedhydrocarbons, , , ,car-bonmonoxide, , pistonmovesupanddownina cylinder,transmittingitsmotionthrougha (topdeadcenter)B=crankanglePistonPistonr odCrankB=180 (bottomdeadcenter) ; ; ;stroke4, ,thesparkplugisfired, burningmixtureexpands, , ,highpoweris
The ignition system is designed to ignite the air-fuelmixture at the optimum in stant. Prior to the implementation of emission controls, engine power was the primary concern in ignition timing. As engine speed increases, optimal power output is achieved 0.3 'I-, ~ 0' 0.2 ~ u l.L (f) III 0.1 Figure 4.2 Variation of actual and indi
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