Torque control method in mode switching process of hybrid electric vehicle

Abstract

The invention provides a torque control method in a mode switching process of a hybrid electric vehicle, which comprises the following steps of firstly, analyzing a driver model to obtain required power of the whole vehicle, and obtaining rotating speed of driving wheels according to vehicle speed, then estimating the sliding friction locking torque of a first clutch, the sliding friction lockingtorque of a second clutch and the driving torque of the driving shaft by using an observer method, smoothing the whole vehicle required power to obtain filtered whole vehicle required power, limitingthe filtered whole vehicle required power to obtain whole vehicle limited required power, and calculating to obtain final required torque of the whole vehicle, constructing a linear programming problem, and calculating to obtain required torques of a small motor and a large motor, and finally, according to the required torques of the small motor and the large motor and the actual power of the engine, using a staged control and calibration method of the first clutch and the second clutch to correspondingly obtain the required torques of the engine, the first clutch and the second clutch. The method is simple and feasible, and safe and efficient distribution of the torque required by the double motors is achieved.

Description

technical field [0001] The invention relates to the field of automobile control, in particular to a torque control method during mode switching of a hybrid electric vehicle. Background technique [0002] During the driving process of the hybrid electric vehicle, gears will be switched according to the working conditions and the driver's intention. Correspondingly, the working mode of the hybrid system used by the hybrid electric vehicle will change accordingly. For switching between different working modes , will involve torque distribution, and 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 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 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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