On-line monitoring system for secondary air valve

The invention provides an on-line monitoring system for a secondary air valve. The on-line monitoring system comprises an engine, a secondary air control valve, the secondary air valve, a secondary air pump, an exhaust pipe, a linear oxygen sensor, a control module and a secondary air device on-line monitoring module. Under the situation that the preset condition is met, the practical secondary air flow rate is determined by the secondary air device on-line monitoring module on the basis of data collected by the linear oxygen sensor and the control module, the theoretical secondary air flow rate is determined on the basis of a preset method, and sealing monitoring is achieved on the secondary air valve by comparing the difference between the practical secondary air flow rate and the theoretical secondary air flow rate. According to the on-line monitoring system for the secondary air valve, the stable and reliable diagnosis result can be obtained, and the regulatory requirements are metaccordingly. 本发明提供种二次空气阀