动力总成匹配技术-英文.ppt

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1、PowertrainMatchingJohnBucknellDaimlerChryslerPowertrainSystemsEngineeringSeptember30,2006WhatisPowertrainMatching?SelectingtherightengineandgearingforagivenapplicationNotjustperformance,butgivingthedrivertheexpectedresponsetopedalinputsInautomotiveapplicationsdelvesdeeperintotransmissionshifts

2、chedulesasfueleconomyisheavilyimpactedAlittlesidestorytogetyouintherightmindsetwhichillustratesthedifferencebetweenmotorheadsandeveryoneelseTheStoryofPowerandthePowerParadigm(theearlylifeofElectronicThrottleControlatChrysler)TheBeginningDriverpushesonPedaltomovevehiclePedalformerlyknownas

3、GasPedal,andbeforethat,AcceleratorPedalPedalDriverDriverIntentRelatestoPedalPositionPedalPositionFootoffPedalFlooredSlowdownMaintainspeedSpeedupalittleSpeedupalotDriverIntentDriverIntentDriverIntentisessentiallyaccelerationrate(+or-)Sincepedalpositionisrelatedtodriverintent,pedalpositionisrela

4、tedtodesiredvehicleacceleration.AccelerationRelatestoPedalPositionPedalPositionFootoffPedalFlooredVehicleAccelerationVehicleAccelerationNewton’sFirstLaw:F=maVehiclemassisconstant(ignoringfuelusage,washersolventspray,andanyfluidleaks)So,ForceisproportionaltoaccelerationForceRelatestoPedalPositi

5、onPedalPositionFootoffPedalFlooredForceAppliedtoVehicleWhereDoestheForceComeFrom?Engineproducessometorque,ataspeed:Transmission:IgnoringLosses,ofCourseWhereDoestheForceComeFrom?Axle:IgnoringLosses,ofCourseWhereDoestheForceComeFrom?Tire:IgnoringLosses,ofCourseInteresting,butnottheendoftheStory.

6、WhereDoestheForceComeFrom?Note:WhereDoestheForceComeFrom?Power-therateatwhichworkisdone:PowerisForcetimesVelocity(linear)PowerisTorquetimesRotationalSpeed(rotary)WhereDoestheForceComeFrom?Engineproducespower:WhereDoestheForceComeFrom?Transmission:IgnoringLosses,ofCourseWhereDoestheForceComeFro

7、m?Axle:IgnoringLosses,ofCourseWhereDoestheForceComeFrom?Tire:IgnoringLosses,ofCourseWhereDoestheForceComeFrom?Powerisconserved:POWERISABSOLUTETorqueisrelative(dependsongearratio)IgnoringLosses,ofCourseWhereDoestheForceComeFrom?Theforcec