Torque control method in hybrid electric vehicle mode switching process

Abstract

The invention provides a torque control method in the mode switching process of a hybrid electric vehicle. First, the driver model is analyzed to obtain the required power of the whole vehicle, and the rotational speed of the driving wheel is obtained according to the vehicle speed; then the observer method is used to estimate the friction lock of the first clutch. The locking torque, the friction locking torque of the second clutch and the driving torque of the drive shaft; then, the required power of the whole vehicle is smoothed to obtain the required power of the whole vehicle after filtering, and the required power of the whole vehicle after filtering is limited to obtain the limited required power of the whole vehicle, Calculate the final required torque of the whole vehicle; then construct a linear programming problem to calculate the required torque of the small motor and the large motor; finally, apply the split of the first clutch and the second clutch according to the required torque of the small motor and the large motor and the actual power of the engine. Phase control and calibration method, correspondingly obtain the required torque of the engine, the first clutch and the second clutch. The method of the invention is simple and feasible, and realizes the safe and efficient distribution of the torque demanded by the dual motors.

Description

technical field [0001] The invention relates to the field of vehicle control, in particular to a torque control method during mode switching of a hybrid vehicle. Background technique [0002] During the driving process of the hybrid vehicle, the gear switch will be performed according to the working conditions and the driver's intention. Accordingly, the working mode of the hybrid system used by the hybrid vehicle will change accordingly. For the switching between different working modes , will involve torque distribution, whether the torque distribution is appropriate will ultimately affect the system efficiency of the power system and the fuel consumption of the vehicle. The most important thing in torque distribution is the torque distribution of the two motors. If the distributed torque exceeds the limit of the motor capacity, the output torque will deviate from the driver's power demand, and the lever posture cannot be effectively adjusted to the optimal working point o...

AI Technical Summary

Problems solved by technology

The most critical thing in torque distribution is the torque distribution of the two motors. If the distributed torque exceeds the limit of the motor capacity, the output torque will deviate from the driver's power demand, and the lever posture cannot be effectively adjusted to the optimal operating point of the engine. Possible drive train torsional vibration problems

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