基于可变计数门限的车检器设计

Design of vehicle detector based on variable count threshold

设计了一种基于可变计数门限的车检器,用于公路上检测机动车行驶速度和统计行车流量。车检器以ATMEL公司的8 bit低功耗AVR单片机ATmega16A为控制器,通过LC谐振电路将车辆通过情况转化为谐振频率的变化,单片机对变化的谐振频率信号进行分析和处理,最后通过RS485总线将检测结果发送给上位机。此车检器在实验室环境下工作稳定,能够在2.5 ms内完成一次检测,对公路交通监测与管理有较大实用价值。

This paper designs a vehicle detector based on variable count threshold which can be used to detect the speed of motor vehicle and the traffic flow on the road. The core ehip of this deviee is a high-performance, low-power AVR 8-bit microeontroller-ATmega16A produced by ATMEL. The LC oscillator circuit turns the existence case of vehicles into changes in the resonant frequency which can be analyzed and processed by the controller, then the device transmits the test results to the host device via RS485 bus. The vehicle detector works stably in a laboratory environment, and can finish a vehicle detection within 2.5 ms, which has a practical value on the monitoring and management of the current highway traffic.