汽车尾气成分动态检测技术研究

针对汽车尾气成分动态检测的需要，设计不分光红外检测气室、控制系统及上位机软件，开发出简易瞬态工况检测仪。该控制系统以ARM7为核心，传感器信号经放大、A／D转换等调理后实时显示尾气各成分的浓度并存储。检测仪经USB接口把检测数据传递给工控机，利用上位机软件对各成分浓度、流量进行统计，分析出汽车在各工况的排放等。经实验验证：该检测仪可满足动态检测各工况尾气成分和流量的需要，检测结果直接决定环保标志的发放，方便实用。

Design of dynamic testing system for automotive exhaust components

For the need of dynamic vehicle exhaust composition detection, the authors designed non-dispersive infrared gas detection chamber, control system and PC software, and developed a simple transient detector. The control system takes ARM7 as the core, the signal of sensor is amplified and conversed by A/D module, and each concentration of exhaust component is displayed and stored in real time. The data produced by detecting instrument were transferred to the computer through USB interface, the statistics of each component concentration and flow was carried out through PC software, and the emission of the ear in different conditions was analyzed. The experimental results showed that the instrument can dynamically detect gas composition and flow for cars in different working conditions. The test results directly determine the environmental issue, and the method is convenient and practical.