A control method for a single-shaft parallel hybrid system

Abstract

The invention discloses a control method of a monoaxial parallel hybrid power system, which can improve control reliability and safety and full combines working characteristics of an engine and a motor for torque distribution so as to improve the working efficiency of the engine, the motor and a battery. The control method comprises the steps of detecting and judging whether a brake pedal and an acceleration pedal move or not, if the brake pedal and the acceleration pedal move at the same time, or the brake pedal and the acceleration pedal both do not move or only the brake pedal moves, outputting a brake torque according to the position of the brake pedal; if the brake pedal does not move and the acceleration pedal moves, calibrating and outputting a required driving torque. The method realizes priority in braking, improves driving safety of a vehicle, avoids safety accidents caused by maloperation of the acceleration pedal, and reduces the damage to the vehicle caused by the fact that the acceleration pedal and the brake pedal are triggered at the same time; when the brake pedal and the acceleration pedal both have no action, the vehicle is controlled to enter a brake mode to perform braking sliding, and fully recovers braking energy.

Description

technical field [0001] The invention relates to the technical field of automobile power systems, in particular to a control method for a single-shaft parallel hybrid power system. Background technique [0002] A hybrid power system refers to a power system that uses a motor and an engine as a power source to provide driving torque. It can be combined with traditional internal combustion engine technology to greatly improve fuel consumption and reduce emissions, and has been widely used. [0003] According to the number of power sources and the way of power transmission, hybrid electric vehicles can be divided into series type, parallel type and hybrid type. Among them, the single-shaft parallel hybrid electric vehicle is a kind of parallel mild hybrid power. Its structural feature is that the engine and the electric motor are mixed on one shaft, and the electric motor used can perform power assist and power generation at the same time. It is currently widely used. Hybrid sc...

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Problems solved by technology

[0006] It can be seen that in the prior art, the torque distribution is completely based on the SOC value of the battery. However, this control method does not divide the SOC carefully enough, and does not fully consider the working characteristics of the motor, engine and battery, and cannot replace the torque output scheme according to actual needs. , and it is impossible to make the engine, motor and battery work in the high-efficiency area

[0007] More importantly, the torque output is completely controlled according to the SOC value, and it does not fully consider how to calibrate the required driving torque and how to adjust the required driving torque according to the vehicle and road conditions; moreover, if the brake pedal and the accelerator pedal are simultaneously work or not work at the same time, that is to say, when it is impossible to judge whether the demanded drive torque is less than zero, the control method in the prior art will be disordered

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