Electric motor zero torque control bisynchronous shifting method for hybrid vehicle

Abstract

The invention relates to an electric motor zero torque control bisynchronous shifting method for hybrid vehicles, belonging to the technical field of modern transportation. The method is characterized in that vehicle speed ua and throttle valve alpha are monitored to identify shifting points; throttle percentage is reduced and the electric motor torque is increased; when throttle percentage is less than the given threshold value, a clutch is separated and the electric motor torque is controlled to be zero and original shift is restored; engine speed is adjusted to matched target speed ne, meanwhile zero torque control is performed on the electric motor and a zero torque control map, input voltage Uin and input current Iin corresponding to the given inverter matched target speed nm are inquired and the electric motor speed is controlled to reach the matched target speed nm; when the deviation between the electric motor speed nm and the matched target speed nm of the electric motor is less than the given threshold value, a new shift is moved to; electric motor torque output is restored; when the deviation between the engine speed ne and the matched target speed ne is less than the given threshold value, the clutch is combined; finally, engine torque output is restored. The invention has the effects and benefits of reducing shifting impact, shortening power interruption time and improving shifting comfort.

Description

technical field [0001] The invention belongs to the technical field of modern traffic, and relates to a control method for a power assembly of a hybrid electric vehicle, in particular to a shifting method for a hybrid electric vehicle using an electronically controlled mechanical automatic transmission. Background technique [0002] Energy saving and environmental protection are the two major themes in the development of the automobile industry today. Because hybrid vehicles not only inherit the advantages of high specific energy and high specific power of traditional engines, but also make up for the short driving range of pure electric vehicles, and significantly improve the fuel economy and emission performance of the whole vehicle, it has become the most industrialized vehicle at present. Models with globalization and marketization prospects. There are three types of hybrid electric vehicle powertrain structures: series, parallel and hybrid. In space, the axes of the o...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: Aiming at the shortcomings of the large moment of inertia at the input end of the parallel hybrid electric vehicle transmission that adopts an electronically controlled mechanical automatic transmission, which causes difficulty in shifting gears, a zero-torque control double synchronous motor for hybrid electric vehicles is proposed. The gear shifting method uses the motor zero torque control method to match the motor target speed, so that the moment of inertia at the input end of the transmission is close to zero during the gear shifting process, reducing the shifting impact and improving the shifting quality; the engine is also controlled to match the target speed, so that The speed difference between the main and driven friction plates of the clutch is reduced, further reducing power loss and improving system efficiency

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