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1、How Does A Car Work?Car Sub-Systems of InterestTorque ConverterEngineTransmissionDifferentialTiresCarBodyEngineFour CyclesIntakeCompressionCombustionExhaustSimplified Engine ModelUse SI units!Torque in Nm,velocity in rad/s and Power in WCar Sub-Systems of InterestTorque ConverterEngineTransmissionDi
2、fferentialTiresCarBodyTorque ConverterTorque ConverterThe model of a torque converter is fairly complex and highly nonlinearWe will not consider it in this class.If you need it,it will be provided to you as a Matlab function.Car Sub-Systems of InterestTorque ConverterEngineTransmissionDifferentialTi
3、resCarBodyTransmissionPurpose:provide large power at all vehicle velocitiesTransmissionmorecompactsunplanetringModel of a TransmissionAssumptions:No friction or other lossesNo inertiaReduces the rotational velocity:Increases the torquewhere n is the transmission ratio and subscript in refers to the
4、shaft connected to the torque converter.Car Sub-Systems of InterestTorque ConverterEngineTransmissionDifferentialTiresCarBodyDifferentialModel of a Differential Same as TransmissionAssumptions:Car drives in a straight lineNo friction or other losses;no inertiaReduces the rotational velocity:Increase
5、s the torquewhere n is the transmission ratio and subscript in refers to the shaft connected to the transmission.Model of a WheelAssumptions:Car drives in a straight lineNo slip;no tire deformation;no friction losses;no inertiaConverts rotational velocity into translational velocity:Converts torque into force:where R is the radius of the wheel.Model of the Car BodyWind Resistance:Gravitational Force:Tire Resistance:Putting It All TogetherExamples of Other Models in Vehicle DesignComputational Fluid DynamicsNoise,Vibration,and HarshnessCrash TestingThermalStress Analysis