Control method for four-wheel-driven hybrid electric vehicle

Abstract

The invention provides a control method for a four-wheel-driven hybrid electric vehicle. The control method comprises the first step of detecting ignition key signals, torque required by the vehicle, the charge state of a power battery and vehicle speed signals, and the second step of controlling the vehicle to switch between multiple working modes according to the ignition key signals, the torque required by the vehicle, the charge state of the power battery and the vehicle speed signals. According to the control method, the multiple working modes are adopted, and the advantages of four-wheel-driven hybrid power can be given to full play. Through switching between the multiple working modes, the vehicle can be in an optimal working state all the time, so that fuel consumption is lowered. In addition, through distribution of the torque of all components in different working modes, the working efficiency of an engine, an ISG motor and a rear axle motor can be optimized, so that the fuel consumption of the whole vehicle is further lowered.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a control method for a four-wheel-drive hybrid electric vehicle. Background technique [0002] At present, with the emergence of four-wheel drive hybrid vehicles, along with the control of four-wheel drive hybrid vehicles, in the existing control method for controlling electric four-wheel drive hybrid vehicles, such as the technical solution disclosed in the application number: 201010238351.8, The vehicle working mode is divided into driving preparation mode, pure electric mode, engine starting mode, normal mode and braking mode, a total of 5 working modes. In addition, as in the technical solution disclosed in the application number: 200910040759.1, the vehicle working mode is divided into There are a total of 5 working modes: low-speed pure electric mode, engine high-efficiency mode, high-speed mode, strong hybrid four-wheel drive mode and energy recovery mode....

AI Technical Summary

Problems solved by technology

[0003] However, the vehicle emissions performance is not controlled during engine shutdown dynamics, resulting in poor emissions performance

In addition, when the speed of the vehicle is low or the power system of the front axle fails, the control of the vehicle is not considered, resulting in potential safety hazards for the vehicle

In addition, insufficient consideration is given to the working mode of the front axle drive. When the front axle is driven, it may be the front axle parallel power generation mode (the front axle engine is partially powered to drive the vehicle, and part of the power is generated by the ISG at the same time), and it may be the front axle parallel connection. Driving mode (the engine and ISG both output driving force), but none of the existing methods are involved, and the control of the vehicle is not perfect

In addition, as in the above-mentioned control method, the transition conditions between working modes are not clear, and it is difficult to implement in practical applications.

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