The Research Of Key Technology For AEB Pedestrian Detective Equipment

With the development of automotive active safety technology,regional traffic accident death toll is gradually decreased,but the trend of vehicle frontal crash death toll is rising year by year.The development of sensor technology and integrated circuit technology promotes the improvement of the function of driving assistant system,Equiping the advanced driving assistant system with high reliability has become the trend of the development of the vehicle at the present stage.According to data,equipped with automatic Emergency Braking systems(AEB)of the vehicle can greatly improve the pedestrian safety.Europe and China are successively introduced AEB system test articles of association.Therefore,the pedestrian AEB system function test has important practical significance.In view of the pedestrian AEB function test,this paper describes the research of key technology for AEB pedestrian testing equipment.According to 2018 C-NCAP and 2015 E-NCAP about the test requirements of AEB pedestrian system,this paper design the entire structure of the AEB pedestrian test equipment,puts forward the system function modules in the dummy,pulley systems,drive control system,the difference of precise positioning system,wireless communication system design requirements.For each function module design requirements for the following system hardware design:design the having real appearance size,infrared and radar characteristic of dummy and the dummy supporting plate;The pulley system structure design;design the driving control system controller,the main chip STM32F767 is used in information analysis,processing and controlling each module,STM32F103 as controlled chip is used to control motor.Selected the cole Morgan 0,62 KW servo motor and servo drive as the motor and servo drive system;Choose NRF24L01 chip as the system of wireless communication module;select and design the difference precise positioning module on the hardware.Based on the design of the overall equipment architecture,each function module and the system hardware,this paper descripes the software platform and the system control algorithm:transplants the software platform FreeRTOS to the main chip STM32F767;Through to the base station and rover synchronous observation of four satellites,carrier phase decomposition,realize the cm-level positioning;Designed to avoid the flexible impact,realize the dummy speed,position precision control of S type curve of the motor acceleration and deceleration control algorithm;design the linkage control algorithm to match the autonomous robot joint test system under various AEB pedestrians test scenarios.Verified by test,the identified performance of AEB pedestrians tesiting system dummies are good,the AEB pedestrian testing equipment of the testing performance is good,can satisfy more correctly for AEB system function test requirements in 2018 C-NCAP and 2015 E-NCAP.