UNCOMMON DIAGNOSIS DEVICE OF A SECONDARY AIR SYSTEM

摘要

The present invention relates to an apparatus for diagnosing abnormalities of a secondary air system.;According to the configuration of the present invention, the secondary air pump 1 for generating secondary air is supplied to the exhaust manifold 4 through the combination valve 2, and is reacted according to the degree of negative pressure of the surge tank 3. The solenoid valve (5) is operated to regulate the opening degree of the combination valve (2) to interrupt the supply of secondary air, wherein the temperature sensor (10) is installed around the combination valve (2) to exhaust the The exhaust gas flows back from the manifold 4 to detect an increase in the temperature in the circuit, and the abnormal diagnosis circuit 20 sends the abnormal confirmation signal to the ECU 6 as a signal for control.;By the configuration of the present invention, it is a very useful invention, such as to detect the abnormal phenomenon that the exhaust gas flows back from the exhaust management (4) to promote vehicle safety by failure diagnosis.