Hybrid power automobile work mode control method

Abstract

The invention relates to a hybrid power automobile work mode control method, which comprises the following steps that the position of an accelerator pedal corresponds to a certain automobile speed, and a corresponding relationship between the pedal position and the automobile speed is obtained; an automobile speed change rate from the current automobile speed to a target automobile speed is calculated, and the automobile speed control increment is calculated according to the automobile speed change rate; in the hybrid power automobile work mode switching process, an engine accelerator changes according to the set change rate, and a speed regulation command of a motor is determined according to the motor rotating speed control increment. The hybrid power automobile work mode control method has the advantages that the output torque of an engine does not need to be precisely estimated, the running stability of vehicles, particularly the running stability in the mode switching process can be maintained all the time, the mechanical impact is reduced, and the driving comfort and the robustness in the mode switching control process are improved.

Description

technical field [0001] The invention relates to the control of a hybrid electric vehicle, in particular to a method for controlling a working mode of a hybrid electric vehicle. Background technique [0002] Parallel hybrid electric vehicles have working modes such as pure electric drive, pure engine drive, joint drive of motor and engine, and engine-driven motor power generation. When the system switches between these working modes, there are engine output torque and motor output torque. A sudden change will affect the speed stability. At present, in order to control the stability of the vehicle speed, it is usually achieved by maintaining the output torque of the hybrid power system, that is, estimating the output torque of the engine, and then adjusting the torque of the motor to compensate for the fluctuation of the engine torque, so as to achieve two The total output torque changes smoothly, so as to meet the torque demand for stable vehicle speed. The disadvantage of t...

AI Technical Summary

Problems solved by technology

[0002] Parallel hybrid electric vehicles have working modes such as pure electric drive, pure engine drive, joint drive of motor and engine, and engine-driven motor power generation. When the system switches between these working modes, there are engine output torque and motor output torque. A sudden change will affect the speed stability

At present, in order to control the stability of the vehicle speed, it is usually achieved by maintaining the output torque of the hybrid power system, that is, estimating the output torque of the engine, and then adjusting the torque of the motor to compensate for the fluctuation of the engine torque, so as to achieve two The total output torque changes smoothly, so as to meet the torque demand for stable vehicle speed. The disadvantage of this method is that the factors affecting the engine torque are very complicated, and it is difficult to achieve a more accurate estimation. The torque feedback of the motor is used in practical applications. Therefore, the control method based on engine torque estimation and motor torque feedback has poor adaptability and cannot meet the needs of actual driving.

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