Research On Modeling And Simulation Of Steer-by-wire System For Electric Forklift

The steer-by-wire (SBW) system is a kind of widely used power steering system in vehicle area, which is one of the research highlights and cutting-edge technologies in today’s steering technology fields. The difference from traditional mechanical steering system is that the mechanical connection between steering wheel and steering wheel is replaced by control signal. SBW can get rid of limitation of tradition steer system, which can not only design force transfer trait freely, but design angle transfer trait for vehicle steering. SBW is an important innovation which brings infinity design space and great improve steer capability. As a key technology of measuring the performance of an electric forklift, steering performance has a great impact on flexible working of the forklift. Therefore, the research work of steer-by-wire system for electric forklift has great theoretical and practical significance.Firstly, the steering system and steer-by-wire development and research status are described in this paper. Secondly, system structure, performance characteristics and key technologies of SBW system are briefly described. On this basis, a SBW system dynamic model and linear two-degrees-freedom vehicle model are established. In order to meet the demand of a operational stability of a vehicle, after analyzing the factors of a angle transmission ratio of steering system, the ideal angle transmission ratio is presented, control algorithm about front-wheel corner for SBW system is designed. To improve a car’s steering characteristics, PID control algorithm is realized, and simulation is done. The result shows that the algorithm is good for SBW, can enhance the vehicle’s operation stability and security. Finally, before the study road feeling control strategy, we firstly have a control of the actuator’s torque which is the basis of realizing road feeling and the actuator must be have a slowly torque and good position tracking. Moreover, the paper gives a control on the target current of road feeling motor in order to make the motor transport suitable torque to driver.