Development of Vehicle End-of-line Emission Auto Detection System with Double Idle Method Based on OBD

For the traditional vehicle end-of-line emission detection system which is hard to control engine's high idle running, we propose an auto emission detect system based on OBD to control the engine's double idle. The system consists of the emission detect software VCI system, emission analyzer and database server, etc., which can control the engine's speed precisely and realize auto detection. The test result shows that the system improves engine speed stability in high idle running detection, reduce detection time and lowers labor intensity, and improves the automation level of end-of-line emission detection.