Control method utilizing motor to start engine for double-clutch type hybrid electric vehicle

Abstract

This method takes a new type of single-motor, dual-clutch hybrid vehicle as the research object, and proposes a control method for the process of the electric motor starting the engine (hereinafter referred to as the electric starter) during driving. Firstly, by analyzing its structural composition and working mode, the system dynamics model is established, the working area of ​​the hybrid electric vehicle is divided, and the corresponding torque management strategy is formulated; then in the actual application process, by calculating the demand torque, battery SOC value and motor speed to judge whether the conditions for starting the engine with the motor are met; when the conditions for starting the motor are met, the mode will be switched, and a command to engage the torque-limiting clutch will be issued, and the hydraulic cylinder oil pressure of the torque-limiting clutch and the specified torque will be coordinated and controlled strategy, coordinate and control the torque of the motor, engine, and the torque of the torque-limiting clutch to realize the process of electric starting. The present invention utilizes the characteristic of rapid response of the motor to increase or decrease the torque of the motor in time according to the control strategy to provide the required torque for starting the engine during driving or compensate for the lack of engine torque, reduce the impact of the switching process, and improve the ride comfort of the hybrid electric vehicle .

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a single-motor double-clutch hybrid electric vehicle as a research object, and a control method for starting an engine through a motor when the vehicle is running is proposed. Background technique [0002] Since the 1990s, major automobile companies in Japan, the United States, and Europe have devoted themselves to the development of hybrid vehicles. After entering the 21st century, various countries have accelerated the process of industrialization of hybrid electric vehicles, and successively launched different forms of hybrid electric vehicle products. However, hybrid vehicles have multiple working modes, and there is a process of switching between working modes. During this process, large torque fluctuations are likely to occur, and torque coordination control is required to reduce the impact and improve the operating mode. The smoothness of the switching pr...

AI Technical Summary

Problems solved by technology

In terms of structure, more double-motor structures are used. Compared with single-motor, its main advantage is stable operation, but the cost is higher.

For the single-motor double-clutch structure strong hybrid electric vehicle in this paper, the structural cost is low, but its dynamic process is complex, and coordinated control is even more important.

If the control is not proper, it will cause the motor to start the engine, prolong the engine starting time, produce a large impact, and deteriorate the ride comfort of the car.

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