Research On The Braking System Of Unmanned Intelligent Vehicle

With the rapid development of automobile technology, vehicle control technology hasmade great progress. The use of computer technology to achieve intelligent vehicle becomean important direction for the development of automotive technology. In recent years,domestic and foreign research institutions and enterprises to carry out a series of unmannedintelligent vehicle research. Unmanned intelligent vehicle through the sensors aware of theirsurroundings, through the host computer analysis and calculate to get the path planning.Finally, by controlling the steering and speed to achieve autonomous driving. Intelligentvehicle control system is divided into the upper planning system and the underlying controlsystems. The Upper planning system was completed to gather information, analysis andplanning, to send commands and other tasks.While, the underlying control system is achievethe direct control of the vehicle. Braking system as the underlying part of the control systemis closely related to the safe operation of unmanned vehicles.Therefore, the design of highstability, and high reliability characteristics of the brake control system, and research on itscharacteristics have become an important part of intelligent vehicle development.This paper intends to modeling and analysis on unmanned intelligent car brake system,on the base of the vehicle modification on brake system design, build and refit from theprototype vehicle, developed the hardware and software two key module, proposed amathematical model of the control system, using the method of add mechanical componentscontrol the brake pedal, selected the DSP driver module by changing the PWM pulse widthcontrol DC motor input voltage for different torque method, designed a set of DC servo motoras the power source for the actuator to control the brake pedal. Around the motor controlsystem, designed the motor drive module, hydraulic close-loop feedback module. For motordrive module design of hardware and software to achieve the speed of the servo motor andservo brake line pressure. The actuator established mathematical model to analyze thenonlinear mathematical model of brake systems and simplified mathematical model of brakesystems, to make preparations for the simulation analysis. Using MATLAB/Simulinksimulation to simulate the step response of emergency braking condition, slight slope tosimulate the response of the braking conditions, consistent with the simulation results showthat the brake control system can meet the braking requirements of unmanned intelligentvehicle.This article aims at raise some initial summary of the experiences on unmanned vehiclebraking system successfully developed. The research for the automotive active safety, vehicleintelligent brake control and the auxiliary driving technology provides some beneficialattempt to help reduce and relieve physical and mental fatigue of drivers.