涡轮增压控制技术(讲义).pdf

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1、涡轮增压发动机匹配，控制与标定技术2017-7-22北京AirflowAlgorithmOverview,DescriptionandCalibration空气流量，压力和温度的模型和标定OverviewofAirflowAlgorithm•Singlealgorithmforengineflowvariables,basedonphysicalmodelsofflow:•PressureStateEstimator•enginemassflows•enginemanifoldpressures•T

2、emperatureStateEstimator•enginegastemperatures•ProvidesengineflowvariablesandcalibrationsrequiredbyEMScontrol,diagnosticandestimationalgorithms:•Fueling•Spark•Purge•EGR/VVT•AirControl(Torque-baseds/w)Sec.1.1.2Value:•Easytounderstandtheinteractionbetwee

3、nthesub-systems;forexample:throttleflow->fillingdynamics->portflow•Easytoaddandsubtractsub-systems•AIR•SystemswithandwithoutEGRvalves•ETCsystemswithoutIAC•Solidbaseofinputs(estimationorcalibrations)tomoreadvancedalgorithms•torque-basedalgorithms•air/EG

4、Rcontrol•camphasingAlgorithmDescriptionOverviewSensorMeasurementsPressurePressureEstimatesEstimatesFlowFlowEstimatesEstimatesActuatorCommandsTemperatureTemperatureEstimatesEstimatesFigure3,Sec.3.2AlgorithmDescriptionFlowsFlowEstimationModelsInletPressu

5、reOutletPressureValveFlowPositionInletTemperatureFlow=F(InletPressure,InletTemperature,valveposition)*F(pressureratio)OutletPressureInletPressure2x2D3D161.4141.21215Sonic110FlowFlow100.88*0.6OR56StandardFlow[g/s]40.40200215010.20.81000.6050010203040506

6、070809010000.400.10.20.30.40.50.60.70.80.91ValvePosition00.2ValvePositionPressureRatioValvePositionPressureRatioPressureRatioSec.3.2.1.12DValveFlowEstimationModelsHard-CodedPressureImplementedfor:1.4RatioEffectThrottleValve1.2EGRValve10.8IdleAirValv

7、e0.6ValveInletDensityCorrection0.4Temperature0.2from0ValveInlet00.10.20.30.40.50.60.70.80.91StandardConditionsPressureRatioPressurePressureRatio/ValveEffectTableValveValveOutletPressure*Valve*MassFlowPressureRatioEstimateMassFlowValvePositionValveSonic

8、under(ifvariable)FlowCalTableStandardConditions250200Sonic150CalTableFlow100SonicStandardFlow[g/s]5000102030405060708090100Sec.3.2.1.1ValvePositionValvePosition3DFlowEstimationModelPurgeFlow–Linerestrictionsforce3Drepresentation–Flowth