Research And Development Of Steering Wheel Return Simulation System

With the development of economic construction,the rate of traffic accidents has increased.It seriously threats people's lives and property,and causes the losses for the society and the individuals.Therefore,the research of the safety factors of people-vehicle-road closed-loop system has important practical significance and application value for preventing and avoiding traffic accidents.Base on vehicle driving simulator,our group have researched deeply on the factor of traffic accidents. This paper researches on steering wheel return simulation system as a part of touching simulation system of vehicle driving simulator.Steering wheel return simulation system which imitates real steering wheel return system can enhance the fidelity and immersion of vehicle driving simulator,increase the tactility of driver's action and be more reliable of the traffic safety experimental date.First of all,this paper introduces the development and present situation of vehicle driving simulator and vehicle steering system.And then,the paper takes vehicle mechanical steering system as studying object,analyses mathematical model of steering aligning torque,and establishes the model of steering aligning torque for experimental car.Base on the model of steering aligning torque,the paper sets steering wheel angle pulse function for simplifying mathematical model.And the paper analyses system requirements and chooses moment motor as generating component.It constructs steering wheel return simulation system which is composed of DC torque motor,DC regulated power supply,displacement sensor,collecting card,SCM circuit board and industrial computer.Based on the existing mechanism of vehicle driving simulator,the system has transformed a part of mechanical structure for installment and movement.Thesis focuses on the hardware and software of steering wheel return simulation system.Digital-to-analog conversion circuit,motor drive control circuit, serial communication circuit,etc is introduced in hardware design part.Therefore, the paper analyses PBC design and gives the picture of it.Based on the analysis of the main content of the software design,serial communication module,signal acquisition module,digital-to-analog conversion module and motor driver module is introduced in detail.Also process flow chart was drawn and some of the key code was given in the software part.Finally,the paper has carried on the test experiment.According to the experiment,the parameters of the model of steering wheel aligning torque is regulated for suiting vehicle driving simulator better.And some of the collection data of steering wheel return experiment is given,which indicates that the steering wheel return simulation system meets the design requirements.