FAULT DIAGNOSTIC UNIT FOR EXHAUST GAS EXTRACTION CONTROL DEVICE Russian patent published in 2017 - IPC F01N3/20 

FIELD: engines and pumps.

SUBSTANCE: in the fault diagnostic unit for the exhaust gas control device according to the invention equipped with an exhaust gas control device including a stress concentration meter catalyst, a feed device supplying ammonia to the exhaust gas control device, an WGFM device enabling some of the exhaust gas to flow back into the inlet pipe from the exhaust pipe downstream than the feeder, a receiving means for obtaining the incoming amount of NO_x as the amount of NO_x flowing into the exhaust gas control device, and the diagnostic tool for diagnosing the fault of the exhaust gas control device using the incoming amount of NO_x received by the receiving means as a parameter, diagnosis of a fault in the exhaust gas control device is not available when the amount of ammonia allowed to flow back along with exhaust gases through the WGFM device exceeds the upper limit value.

EFFECT: increased accuracy of the fault diagnosis.

4 cl, 7 dwg