Hybrid electric vehicle power assembly control method used for series structure

Abstract

The invention discloses a hybrid electric vehicle power assembly control method used for a series structure. When a vehicle is static, in the process that an engine enters in an idle speed charging working condition from a no-load idle speed working condition, a motor can quickly work to the rotation speed close to that of the engine in a rotation speed control mode, then in combination with a front-end clutch, rotation speed fluctuation of the engine can be greatly avoided, and the fuel economy of the engine is improved. When the vehicle is static, in the process that the engine enters in a vehicle starting working condition from the idle speed charging working condition, the charging torque of the motor is reduced to 0 firstly, then the front-end clutch is disengaged, the motor quickly works to the 0 rotation speed in the rotation speed control mode, then a gearbox is combined with a gear-shifting clutch, power output delay generated in the starting process can be greatly reduced, and the driving feeling is improved. The problems of engine rotation speed impact generated when the front-end clutch of the hybrid electric vehicle of the series structure is engaged and power transmission delay generated when the front-end clutch of the hybrid electric vehicle of the series structure is disengaged are solved.

Description

technical field [0001] The invention relates to a hybrid electric vehicle, in particular to a hybrid electric vehicle powertrain control method for a series structure (the motor is located between the engine and the gearbox). Background technique [0002] For series hybrid electric vehicles, especially the series powertrain structure (referred to as P2 structure) in which the motor is located between the engine and the gearbox, a set of front-end clutch 3 is usually installed between the engine 1 and the gearbox 4 to control the engine power coupling or decoupling. Usually the motor input shaft 12 is connected with the output shaft of the front clutch 13, and the motor output shaft 13 is connected with the gearbox 4 input shaft. The gearbox 4 transmits the power transmitted by the motor 2 and the engine 1, and outputs it through the shifting mechanism or the shifting clutch 5, thereby driving the vehicle, see figure 1 . [0003] Generally, a P2 structure vehicle needs to ...

AI Technical Summary

Problems solved by technology

However, due to the moment of inertia of the motor and the front-end clutch, it takes a long time for the motor to completely drop from the original idling charging speed to zero speed (generally about 2 to 5 seconds), resulting in lag and delay in power output

If the gear shift mechanism or shift clutch is directly engaged before the motor speed is completely reduced to zero, it may cause a shock when the vehicle starts, resulting in poor driving experience at the start

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