Engine shutdown control method, system and hybrid electric vehicle

Abstract

The invention discloses an engine shutdown control method, a system and a hybrid electric vehicle. The method comprises the following steps: when the engine shutdown demand exists, judging whether thecurrent power system mode is a parallel mode or not; if not, controlling the engine shutdown; if not, controlling the engine shutdown; if not, controlling the engine shutdown. If yes, obtaining the current torque of the engine and the power generation torque of the ISG motor in the parallel mode, obtaining the compensation torque of the ISG motor according to the current torque of the engine, andcontrolling the ISG motor to work according to the target torque; Obtaining the current offset drive torque of the ISG motor to the engine, obtaining the assist target torque according to the currentoffset drive torque, and controlling the front drive motor to work according to the assist target torque; Whether the engine torque coordination is completed is judged according to the current torqueof the engine. If so, the control clutch is disconnected, and the engine is stopped after the clutch is disconnected. The invention makes up for the loss of the power of the whole vehicle, ensures that the power of the whole vehicle will not be attenuated, and obtains better driving performance.

Description

technical field [0001] The invention relates to the field of power vehicles, in particular to an engine shutdown control method, system and a hybrid vehicle. Background technique [0002] Plug-in hybrid electric vehicles can not only obtain power energy through external charging, but also provide power through the combustion of gasoline in the engine, taking into account the cleanliness and environmental protection of pure electric vehicles, as well as the long driving range and convenient energy acquisition of hybrid vehicles. At the same time, the multi-mode transmission system of the dual motors on the front axle, the gearbox with clutch and the motor on the rear axle combines the advantages of the series system (the engine participates in power generation) and the parallel system (the engine participates in power generation and directly participates in driving). The combination of bridge double motors and gearbox with clutch realizes the switching between series mode and...

AI Technical Summary

Problems solved by technology

[0003] The shutdown process of the multi-mode transmission system involves two processes: switching from parallel mode to series mode and switching from series mode to pure electric mode. During the transition from parallel mode to series mode, when the engine performs torque coordination, the engine When the driving torque of the hybrid vehicle is converted to the generating torque, the ISG (Integrated Starter / Generator, integrated starter / generator) motor will offset the driving torque of the engine, reducing the power generation of the electric system (including the ISG motor and engine) of the hybrid vehicle. Causes the power of the hybrid vehicle to weaken and reduce the driver's driving experience

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