[0040] figure 1 Shown is a parallel hybrid power system, which includes vehicle controller HCU 1, ISG motor controller IPU2, power battery 3, transmission controller TCU4, continuously variable transmission CVT5, clutch 6, ISG motor 7 (hereinafter referred to as motor), engine 8 , engine controller ECU9.
[0041] The method of the present invention uses the vehicle controller HCU1 as a carrier, and is realized through a parallel hybrid power system including this control method. The following five different situations are combined. Figure 7 The technical implementation process of the present invention will be described.
[0042]Motor assist case 1 (see figure 2 ):
[0043] 1) The vehicle drives to a certain state, the driver's demand torque Tq_drv_req=160Nm, Tq_boost=120Nm, Tq_drv_req> Tq_boost, needs the motor to assist, the vehicle controller HCU1 distributes the target torque to the engine as Tq_ice_req=120Nm, and distributes it to the motor target torque Tq_mg_req=40Nm, at this time, the transmission controller TCU4 judges that the torque of the transmission input shaft needs to be reduced, and sends the target value of torque reduction Tq_trans_in_req=100Nm to the HCU through CAN communication, and the effective flag of torque reduction demand Flag_tq_reduct=1;
[0044] 2) Assuming that the current output torque of the engine is Tq_ice_act=120Nm, the output torque of the motor is Tq_mg_act=40Nm, the torque of the transmission input shaft is Tq_tran_in_act, the torque of the transmission input shaft is equal to the sum of the engine output torque and the motor output torque, Tq_tran_in_act=Tq_ice_act+Tq_mg_act =120+40=160Nm;
[0045] 3) The torque value that needs to be reduced on the basis of the current torque output DeltaTorqueReduct = Tq_trans_in_req - Tq_tran_in_act=100-160=-60Nm, DeltaTorqueReduct<0 and Flag_tq_reduct=1, proceed to the following steps for torque reduction control;
[0046] 4) The HCU coordinates and controls the torque of the engine and the motor according to the current working state of the motor to achieve the purpose of torque reduction.
[0047] Set the target value TorqueMGReduct of the motor after torque reduction, the minimum operating torque of the motor is TorqueMGMin=-110Nm; the target value of the engine after torque reduction is TorqueICEReduct.
[0048] Because Tq_mg_act=40Nm >0, the current motor is working in booster mode, and the priority is to reduce the motor torque. The specific method is as follows:
[0049] |DeltaTorqueReduct|=|-60|=60Nm,
[0050] Tq_mg_act=40Nm,
[0051] So |DeltaTorqueReduct|>= Tq_mg_act,
[0052] So TorqueMGReduct = 0Nm, Flag_tq_mg_reduct=1,
[0053] TorqueICEReduct = Tq_trans_in_req=100Nm, Flag_tq_ice_reduct=1.
[0054]
[0055] Motor assist case 2 (see image 3 ):
[0056] 1) When the vehicle drives to a certain state, the driver's demand torque is equal to Tq_drv_req=130Nm, Tq_boost=110Nm, Tq_drv_req> Tq_boost, the motor is required to assist, and the vehicle controller HCU1 allocates the engine target torque Tq_ice_req=100Nm, which is allocated to the motor target torque Tq_mg_req=30Nm, at this time, the transmission controller TCU4 judges that the torque of the transmission input shaft needs to be reduced, and sends the target value of torque reduction Tq_trans_in_req=110Nm to the HCU through CAN communication, and the effective flag of torque reduction demand Flag_tq_reduct=1;
[0057] 2) Set the current output torque of the engine as Tq_ice_act=100Nm, the output torque of the motor as Tq_mg_act=30Nm, and the torque of the transmission input shaft as Tq_tran_in_act, which is equal to the sum of the output torque of the engine and the output torque of the motor, Tq_tran_in_act=Tq_ice_act+Tq_mg_act=100+30= 130Nm;
[0058] 3) The torque value that needs to be reduced on the basis of the current torque output DeltaTorqueReduct = Tq_trans_in_req - Tq_tran_in_act=110-130=-20Nm, DeltaTorqueReduct<0, and Flag_tq_reduct=1, proceed to the following steps for torque reduction control;
[0059] 4) The HCU coordinates and controls the torque of the engine and the motor according to the current working state of the motor to achieve the purpose of torque reduction.
[0060] Set the target value TorqueMGReduct of the motor after torque reduction, the minimum operating torque of the motor is TorqueMGMin=-110Nm; the target value of the engine after torque reduction is TorqueICEReduct.
[0061] Because Tq_mg_act=30Nm >0, the current motor is working in booster mode, and the motor torque should be reduced first. The specific method is as follows:
[0062] |DeltaTorqueReduct|=|-20|=20Nm,
[0063] Tq_mg_act=30Nm,
[0064] So |DeltaTorqueReduct|
[0065] So TorqueMGReduct = Tq_mg_req+ DeltaTorqueReduct=30-20=10Nm, Flag_tq_mg_reduct=1,
[0066] TorqueICEReduct = Tq_ice_req=100Nm, Flag_tq_mg_reduct=0.
[0067]
[0068] Motor charging case 1 (see Figure 4 ):
[0069] 1) The vehicle drives to a certain state, the driver's demand torque is equal to Tq_drv_req=80Nm, the battery state of charge SOC=40, SOC_charge=60, SOC
[0070] 2) Set the current output torque of the engine as Tq_ice_act=100Nm, the output torque of the motor as Tq_mg_act=-20Nm, and the torque of the transmission input shaft as Tq_tran_in_act, which is equal to the sum of the output torque of the engine and the output torque of the motor, Tq_tran_in_act=Tq_ice_act+Tq_mg_act=100-20 =80Nm;
[0071] 3) The torque value that needs to be reduced on the basis of the current torque output DeltaTorqueReduct = Tq_trans_in_req - Tq_tran_in_act=50-80=-30Nm, DeltaTorqueReduct<0, and Flag_tq_reduct=1, proceed to the following steps for torque reduction control;
[0072] 4) The HCU coordinates and controls the torque of the engine and the motor according to the current working state of the motor to achieve the purpose of torque reduction.
[0073] Set the target value TorqueMGReduct of the motor after torque reduction, the minimum operating torque of the motor is TorqueMGMin=-110Nm; the target value of the engine after torque reduction is TorqueICEReduct.
[0074] Because Tq_mg_act=-20Nm < 0, the current motor is working in the charging mode, and the priority is to increase the motor torque. The specific method is as follows:
[0075] DeltaTorqueReduct+ Tq_mg_act=-30-20=-50Nm,
[0076] TorqueMGMin=-110Nm,
[0077] So DeltaTorqueReduct + Tq_mg_act > TorqueMGMin,
[0078] So TorqueMGReduct = Tq_mg_req + DeltaTorqueReduct=-20-30=-50Nm,
[0079] Flag_tq_mg_reduct=1,
[0080] TorqueICEReduct = Tq_ice_req=100Nm, Flag_tq_ice_reduct=0.
[0081]
[0082] Motor charging case 2 (see Figure 5 ):
[0083] 1) The vehicle drives to a certain state, the driver's demand torque is equal to Tq_drv_req=80Nm, the battery state of charge SOC=40, SOC_charge=60, SOC
[0084] 2) Set the current output torque of the engine as Tq_ice_act=100Nm, the output torque of the motor as Tq_mg_act=-20Nm, and the torque of the transmission input shaft as Tq_tran_in_act, which is equal to the sum of the output torque of the engine and the output torque of the motor, Tq_tran_in_act=Tq_ice_act+Tq_mg_act=100-20 =80Nm;
[0085]3) The torque value that needs to be reduced on the basis of the current torque output DeltaTorqueReduct = Tq_trans_in_req - Tq_tran_in_act=20-80=-60Nm, DeltaTorqueReduct<0, and Flag_tq_reduct=1, proceed to the following steps for torque reduction control;
[0086] 4) The HCU coordinates and controls the torque of the engine and the motor according to the current working state of the motor to achieve the purpose of torque reduction.
[0087] Set the target value TorqueMGReduct of the motor after torque reduction, the minimum operating torque of the motor is TorqueMGMin=-50Nm; the target value of the engine after torque reduction is TorqueICEReduct.
[0088] Because Tq_mg_act=-20Nm < 0, the current motor is working in the charging mode, and the priority is to increase the motor torque. The specific method is as follows:
[0089] DeltaTorqueReduct+ Tq_mg_act=-60-20=-80Nm,
[0090] TorqueMGMin=-50Nm,
[0091] So DeltaTorqueReduct+ Tq_mg_act< TorqueMGMin,
[0092] So TorqueMGReduct = TorqueMGMin=-50Nm, Flag_tq_mg_reduct=1,
[0093] TorqueICEReduct = Tq_ice_req+DeltaTorqueReduct+ Tq_mg_req –TorqueMGMin
[0094] =100-60-20-(-50)=70Nm,
[0095] Flag_tq_ice_reduct=1.
[0096]
[0097] The engine works alone (see Image 6 ):
[0098] 1) The vehicle drives to a certain state, the driver's demand torque Tq_drv_req=80Nm, Tq_boost=110Nm, Tq_drv_req SOC_charge, also does not need The motor works in charging mode. The vehicle controller HCU1 assigns the engine target torque Tq_ice_req=80Nm, and the motor target torque Tq_mg_req=0Nm. At this time, the transmission controller TCU4 judges that the transmission input shaft torque needs to be reduced, and sends a torque reduction signal to the HCU through CAN communication. Target value Tq_trans_in_req=40Nm, torque reduction demand valid flag Flag_tq_reduct=1;
[0099] 2) Set the current output torque of the engine as Tq_ice_act=80Nm, the output torque of the motor as Tq_mg_act=0Nm, and the torque of the transmission input shaft as Tq_tran_in_act, which is equal to the sum of the output torque of the engine and the output torque of the motor, Tq_tran_in_act=Tq_ice_act+Tq_mg_act=80-0= 80Nm;
[0100] 3) The torque value that needs to be reduced on the basis of the current torque output DeltaTorqueReduct = Tq_trans_in_req - Tq_tran_in_act=40-80=-40Nm, DeltaTorqueReduct<0, and Flag_tq_reduct=1, proceed to the following steps for torque reduction control;
[0101] 4) The HCU coordinates and controls the torque of the engine and the motor according to the current working state of the motor to achieve the purpose of torque reduction.
[0102] Set the target value TorqueMGReduct of the motor after torque reduction, the minimum operating torque of the motor is TorqueMGMin=-50Nm; the target value of the engine after torque reduction is TorqueICEReduct.
[0103] Because Tq_mg_act=0, the current motor is not working, and the engine drives the vehicle alone. The specific method is as follows:
[0104] TorqueMGReduct=0, Flag_tq_mg_reduct=0,
[0105] TorqueICEReduct = Tq_trans_in_req=40Nm, Flag_tq_ice_reduct=1.
