Internal Combustion Engines

← Back to document page

4InternalCombustionEnginesInternalcombus tionenginesaredevicesthatgenerateworkusi ngtheproductsofcom-bustionastheworkingfl uidratherthanasa ,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

  System, Ignition, Ignition system