Limping method and control system of hybrid power system based on p2 structure

Abstract

The invention discloses a limp method and control system based on a P2 structure hybrid power system. The limp method includes the following steps: firstly control the clutch to disengage, and when the clutch is in the disengaged state, start the engine through a starter motor, and the engine enters an idle state, Obtain the speed SpeedRef corresponding to the counter electromotive force of the ISG motor; control the engine Engine to execute the speed regulation command, so that the speed is adjusted to SpeedRef; the engine Engine reduces the torque; enable the ISG motor controller, and the ISG motor speed is adjusted to SpeedPower; obtain the optimal economic point Torque T out , the engine performs a torque adjustment action, and the torque is adjusted to T out ; Calculate the required torque T of the vehicle need ; compare T out and T need , when T out ≥T need , the ISG motor charges the power battery, when T out <T need When , the output power of the engine remains unchanged, and the required power P of the whole vehicle is reduced need , to achieve limp. It solves the problem that the vehicle still needs to drive when the battery cannot be discharged or the discharge power is not enough to start the engine, and ensures that the vehicle can drive.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a limp method and control system based on a P2 structure hybrid power system. Background technique [0002] In recent years, major national ministries and commissions have issued a series of policies on promoting the development of new energy vehicles, and hybrid vehicles have also developed rapidly. The P2 structure hybrid power system has become the mainstream of the hybrid power system because of its advantages such as cost and fuel saving effect. [0003] At present, the research of the P2 structure hybrid power system is the control method under the normal mode. According to the basic control method, it is a general method to control the operation mode of the whole vehicle. However, when there is an abnormal mode, the general control method cannot meet the driving needs. The abnormal mode specifically refers to when the power battery cannot be discharged or the ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a limp method and control system based on a P2 structure hybrid power system, which solves the problem that the vehicle still needs to drive when the battery cannot be discharged or the discharge power is not enough to start the engine, and ensures that the vehicle can driving

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