Research on Launch Management Control in Hybrid Vehicles

The launch management strategy of the P2.5 hybrid system is based on the creep force calculation, the traction force arbitration and launch force control. The specific contents are as below:1)The creep control. The base creep force is based on the pedal map and oil temperature. The cancellation conditions of creep force are defined.2)The traction force arbitration. The creep force is sent to this part and the traction force is based on the drive mode, the acceleration pedal map and the vehicle speed.3)The launch torque control. The purpose is to control clutch torque during launch and to send the lock up flag out when launch is finished. There is also a P-controller that controls the desired slip, this can to some extent compensate for poor engine/clutch torque accuracy. The launch control is based on the P-control of the slip speed and the drive compensation is defined.4)The torque arbitration control. There are two crankshaft torque requirements arbitration and crankshaft torque limit transmission. The slow limitation through transmission control is used to protect the gearbox from overload and temporarily reduce the crankshaft torque during gear shifting. The fast limit is only used to temporarily reduce the crankshaft torque during shifting.The vehicle results are conducted and show that launch torque strategy can also meet the driver torque by the motor and avoid the drop of the engine speed.