Electronic control hydraulic power steering system controller and control method thereof

Abstract

The invention provides an electronic control hydraulic power steering system controller and a control method thereof. The controller comprises a microprocessor module, a power module connected with the microprocessor module, a signal conditioning module, a controller area network (CAN) module and a driver module. When a vehicle steers on site or at low speed, the controller meets the requirement for low-speed steering handiness. When the vehicle steers at high speed, the controller meets the requirement for high-speed handling stability. When the vehicle steers urgently, the controller ensures steering responsiveness. When the vehicle steers in full loading, the controller executes a control program according to assist characteristics of the vehicle at a speed lower than the current speed and enhances road feel in steering. A single chip microcomputer is adopted as a control core of the controller. Due to the fact that signals are transmitted mainly in a digital form, the controller is strong in anti-interference capacity and can enable control to achieve optimization by optimizing the curve the assist characteristics and control parameters.

Description

Technical field [0001] The invention relates to the technical field of electronically controlled hydraulic power steering, in particular to an electronically controlled hydraulic power steering system controller and a control method thereof. Background technique [0002] Traditional cars use hydraulic power steering systems, and the power-assisted characteristics of the steering system are fixed, that is, the magnitude of the steering power is not adjusted accordingly with different steering conditions. For example, when a car is turning at a high speed, the driver will feel unclear on the road due to the large steering assistance, and feel that the car is "fluttering", so the car's handling stability and driving safety cannot be guaranteed. In order to improve the steering stability of the car, the power-assisted characteristics of the improved hydraulic power steering system are flatter and longer in the small steering torque area, sacrificing the portability of low-speed steer...

AI Technical Summary

Problems solved by technology

The patent "Electronic Control Hydraulic Power Steering Gear Assembly" (CN200620066801.9) uses a stepping motor to adjust the size of the orifice of the bypass valve to control the flow of hydraulic oil entering the steering control valve, and the controller adjusts the bypass valve according to the vehicle speed The size of the orifice hole ensures low-speed steering portability and high-speed steering stability; the patent "A Valve Characteristic Electronically Controlled Hydraulic Steering System" (CN200620127131.7) proposes that an electromagnetic proportional throttle valve be connected in parallel in the oil circuit of the steering gear. The control unit timely changes the coil current of the electromagnetic proportional throttle valve according to the vehicle speed signal to change the size of the throttle valve orifice, but this patent does not give the specific scheme and control method of the controller; the patent "automotive electronically controlled hydraulic power steering system "(CN200320118460.1) proposes to connect the solenoid valve in parallel between the oil inlet pipe and the oil return pipe of the steering gear, and the control device controls the opening of the solenoid valve port according to the signal of the vehicle speed sensor to adjust the pressure of the steering system, so that the steering wheel operated by the driver It has a lighter feel when the car is at low speed, and has a heavier feel when it is high speed, and the corresponding control circuit is given, but because the controller uses an analog circuit, the controller is easily interfered, and the control parameters are fixed, so it cannot be adapted to work. changes in conditions, and no method of control is given

[0004] To sum up, the existing steering system has the following technical problems: the hydraulic power steering system cannot take into account the steering portability and handling stability and has high energy consumption; Requirements for high steering power

The controller of the electronically controlled hydraulic steering system based on bypass valve orifice adjustment uses an analog circuit, which has poor anti-interference ability, fixed control parameters, and does not consider the control method under extreme conditions

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