Page - 294 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2016,9, 997 In thediagram,Tcmd is thedriverdemandtorque;AssistISGMotor is thepower-assistingmarkof ISGmotor;AssistAllMotor is thepower-assistingmarkofallmotors;v is thevehiclevelocity;vMaxElec is themaximumspeedofpureelectricdriving;SOClow andSOChigh refer to the lowerandupper limitof thebatteryworkingSOC, respectively;Englow andEnghigh refer to the lowerandupper limitof the engineworkingarea, respectively. 3.1.3. TorqueDistributionStrategy inBrakingMode ForHEVs, thereare twosetsofbrakingsystem: theconventionalmechanicalbrakingsystem,and motorregenerativebrakingsystem.Whenbraking, themechanicalbrakingsystemshouldcoordinate with themotors toprovide thedemandedbrakingtorqueforbrakingsafety, recover theexcesskinetic energy,andimprove thevehicleefficiencyaswell. Thebrakingcontrol strategy,which is shownin Figure13, is formulatedbasedonthebatterySOCandthebrakingpedalopening. highSOC SOC< highSOC SOC< Figure13.Control logicflowdiagramofbrakingmode. 3.2. KeyParametersofHEVLogicThresholdEnergyManagementStrategy Accordingto theoptimalworkingareadivisionof theengineandmotor, thedriver’s intention parsing, and the torquedistributionstrategy indifferentworkingmodes, theenergymanagement strategybasedonalogic threshold isestablishedintheMATLAB/Simulink.Afterstudyingtheenergy control strategy, the influencingparameters,whicharepresentedinTable9, canbeobtained. These 294