Control method and power system of hybrid electric vehicle during mode switching

Abstract

The invention discloses a control method in the mode switching of a hybrid power automobile. The control method includes the following steps that: when the hybrid power automobile is switched from a pure electric mode to a hybrid power mode, the position L of a clutch is detected, the required torque Ter of an engine and a required torque of a driving motor are obtained; the transfer torque Tc of the clutch is calculated according to L, and the target rotation speed of the engine is calculated according to the rotation speed of the input shaft of a gearbox, the target torque Tcr of the clutch is calculated according to Ter, and the target position of the clench is obtained according to Tcr; the working state of the engine is judged; and the torque and rotation speed of the engine are controlled according to the working state of the engine, and at the same time, the torque of the driving motor is controlled, and the combining speed of the clutch is controlled. With the control method adopted, power loss in a mode switching process can be avoided, and the dynamic performance and comfort of the hybrid power automobile can be improved. The invention also discloses a power system of a hybrid power automobile.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method for hybrid electric vehicle mode switching and a hybrid electric vehicle power system. Background technique [0002] Hybrid electric vehicles generally include idling start-stop, hybrid, pure electric and regenerative braking and other working modes. It is necessary to reasonably determine and switch to the corresponding working mode to meet the driving needs of the driver and the vehicle. Among the various working modes, the control when switching from pure electric working mode to hybrid working mode is the most complicated, which has always been a technical difficulty in the mode switching of hybrid electric vehicles. [0003] A hybrid vehicle mode switching torque control method is also proposed in the related art. Although it can avoid the step-like increase or decrease of the current actual torque of the motor when the mode jumps or switches, it cannot...

AI Technical Summary

Problems solved by technology

Among the various working modes, the control when switching from the pure electric working mode to the hybrid working mode is the most complicated, which has always been a technical difficulty in the mode switching of hybrid electric vehicles

[0003] A hybrid vehicle mode switching torque control method is also proposed in the related art. Although it can avoid the step-like increase or decrease of the current actual torque of the motor when the mode jumps or switches, it cannot avoid the hybrid vehicle mode switching torque control method. The lack of power or even power interruption during the switching process reduces the power and comfort of hybrid vehicles

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