Vehicle and electric steering oil pump control method and system thereof

Abstract

The invention provides a vehicle and an electric steering oil pump control method and system thereof, and belongs to the field of vehicle power steering. The method comprises the steps that the working mode of an electric steering oil pump is determined according to the current road mode and gear of a vehicle; wherein if the current road mode of the vehicle is a non-ice-snow mode, when the current gear of the vehicle is a neutral gear, the electric steering oil pump is controlled to work in the first mode, and in the first mode, the rotating speed of the steering motor is determined according to the load current in the running process of the steering motor; when the current gear of the vehicle is the forward gear, the electric steering oil pump is controlled to work in the second mode, in the second mode, the rotating speed of the steering motor is determined according to the vehicle speed of the whole vehicle, and the higher the vehicle speed is, the lower the rotating speed of the steering motor is. The working modes of the electric steering oil pump are divided more meticulously according to the current road mode and gear of the vehicle, different working conditions of the vehicle can be adapted, the rotating speed of the steering motor can be controlled more accurately, and the method is safer and more reliable.

Description

technical field [0001] The invention relates to a vehicle and its electric steering oil pump control method and system, belonging to the technical field of vehicle power steering. Background technique [0002] With the development of new energy technology, electric steering oil pumps are generally used as the steering power source of the whole vehicle on pure electric, plug-in, fuel cell and other new energy commercial vehicles. Generally, the electric steering oil pump is driven by the steering motor. The higher the speed of the steering motor, the greater the output flow of the electric steering oil pump, and the greater the steering assistance provided to the vehicle. [0003] There are two main working modes of the existing electric steering oil pump: [0004] Mode 1: The rotation speed of the steering motor is determined according to the load current during the operation of the steering motor. When the load current is greater than the set value, the steering motor is c...

AI Technical Summary

Problems solved by technology

Mode 2 considers to control the steering motor to run at a low speed when the vehicle speed is high to provide a small steering assist to ensure driving safety, but since the steering motor always works at a low speed when the vehicle is stationary, if the driver needs to turn at a large angle at this time, It is necessary to provide a lot of force to turn the steering wheel to complete the steering, and the driving experience is poor

[0006] To sum up, mode 1 can well meet the driver's demand for steering assistance when the vehicle speed is low, but there are potential safety hazards when the vehicle speed is high; mode 2 can ensure driving safety when the vehicle speed is high, and the driving experience is better when the vehicle is stationary. Therefore, the working mode of the existing electric steering oil pump cannot adapt to different working conditions of the vehicle, and it is difficult to meet the driver's demand for steering assistance and driving safety at the same time

Images