Steering control method of drive-by-wire hydraulic steering system of commercial vehicle

Abstract

The invention discloses a steering control method of a drive-by-wire hydraulic steering system of a commercial vehicle. The drive-by-wire hydraulic steering system comprises a steering wheel module, amechanical steering module, a hydraulic transmission module and a control module. An electronic control unit (ECU) in the control module outputs signals to control the operation of a hydraulic pump driving motor and an electromagnetic reversing valve, and drives a connecting rod mechanism to change the turning angle of wheels by changing oil pressure on two sides of a piston of a hydraulic cylinder; and the ECU also outputs current signals and feeds corresponding steering feel back to a driver through a steering feel motor to complete drive-by-wire hydraulic steering. When the drive-by-wire hydraulic steering fails, the ECU outputs commands to engage a failure clutch to start the mechanical steering module. The steering control method of the drive-by-wire hydraulic steering system of thecommercial vehicle is capable of intelligently setting a variable transmission ratio so as to improve the response ability and safety of the steering system of the commercial vehicle and improve the steering performance of the vehicle in general. In addition, in the event of failure of the drive-by-wire hydraulic steering, the steering system can be switched to a reliable mechanical transmission so as to ensure the operability of vehicle steering by the driver in emergencies and ensure the safety of the vehicle.

Description

technical field [0001] The invention belongs to the technical field of steering systems, in particular to a steering control method for a commercial vehicle by-wire hydraulic steering system. Background technique [0002] The steer-by-wire system overcomes various limitations of the mechanical structure in the traditional steering system, and can set the steering transmission ratio arbitrarily, which is the development direction of the future vehicle steering system. The driver only inputs the rotation angle command of the steering wheel. Under the condition of maintaining stable steering, the ECU (Electronic Control Unit) determines the reasonable wheel rotation angle according to the relevant control algorithm according to the input rotation angle of the steering wheel and the current driving state of the vehicle, so as to realize accurate steering wheel rotation. turn. The steering-by-wire system also needs to provide the driver with a simulated "road feel" to optimize t...

AI Technical Summary

Problems solved by technology

However, the angular transmission ratio of the existing hydraulic steering system is a fixed value. When the bus is running in situ or at a low speed, it is often necessary to perform large-angle steering, and the driver needs to input a larger steering wheel angle to complete the steering request, which increases the driver's workload Working intensity; otherwise, the steering wheel will be too sensitive when driving at high speed

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