基于STM32的智能车载路试仪的设计

Design of Motorcycle Test Instrument Based on the STM32

目前所有的摩托车车载路试仪均为手动控制车速,为解决手动控制车速存在测量误差大,效率低的问题,智能车载路试仪采用STM32F103ZE微控制器作为控制核心,利用MT3329GPS模块测量车辆速度,微控制器计算GPS模块测得车速与设定车速的偏差,通过步进电机调节摩托车节气门开度,实现摩托车自动定速行驶、自动加减速等功能,以完成摩托车加速行驶噪声、最高车速、制动性能等道路试验项目;试验结果表明,设备的速度误差为±0.6%(50km/h时),距离误差为±1%;定速行驶时,车辆速度偏差小于±2%,优于标准要求。

At present all of the motorcycle vehicle road test instrument are manual control speed, and to solve the existing manual con- trol speed measurement＇ s problem of low efficiency and measurement error, Motorcycle Test Instrument using STM32F103ZE micro con- troller as control core, MT3329 GPS module measuring vehicle speed, the microcontroller computing GPS module measured the speed of the car and set the speed deviation, through stepping motor to adjust the motorcycle throttle opening, realize automatic constant speed driving and automatic deceleration function, to complete motorcycle acceleration running noise, top speed, braking performance etc road test pro- jects. Test results show that the speed of the device error is ±0. 6% （at 50 km/h）, distance error is ± 1%; At constant speed, vehicle speed deviation is less than -± 2 %, better than standard requirement.