摘  要：針對汽車尾氣成分動態(tài)檢測的需要，設計不分光紅外檢測氣室、控制系統(tǒng)及上位機軟件，開發(fā)出簡易瞬態(tài)工況檢測儀。該控制系統(tǒng)以ARM7為核心，傳感器信號經(jīng)放大、A/D轉(zhuǎn)換等調(diào)理后實時顯示尾氣各成分的濃度并存儲。檢測儀經(jīng)USB接口把檢測數(shù)據(jù)傳遞給工控機，利用上位機軟件對各成分濃度、流量進行統(tǒng)計，分析出汽車在各工況的排放等。經(jīng)實驗驗證：該檢測儀可滿足動態(tài)檢測各工況尾氣成分和流量的需要，檢測結(jié)果直接決定環(huán)保標志的發(fā)放，方便實用。
關(guān)鍵詞：簡易瞬態(tài)工況；尾氣；檢測；ARM7；USB接口
中圖分類號：X830.2；X734.201；TM930.12；TP277     文獻標志碼：A      文章編號：1674-5124（2013）05-0006-05
Design of dynamic testing system for automotive exhaust components
LIU Jian-chun， SHAO Ming-liang
（Department of Mechanics Engineering，Xiamen University of Technology，Xiamen 361024，China）
Abstract: 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 car 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.
Key words: sample transient working condition； exhaust gas； test； ARM7； USB interface