Patent ID: 7222483
Filing Date: 2007-05-29
Classification: F01N,Y02T

Abstract:
1. A device for supplying secondary air, comprising: a secondary air passage for supplying secondary air, to an exhaust passage of an engine, upstream of an exhaust purification device provided in the exhaust passage; a pump provided in the secondary air passage for supplying a secondary air; a battery used for driving the pump; battery voltage detecting means for detecting a voltage of the battery; at least one opening-closing means for opening and closing the secondary air passage; a pressure sensor provided between the pump and the opening-closing means for detecting a pressure in the secondary air passage; malfunction detecting means for detecting a malfunction of at least one of the pump and the opening-closing means on the basis of at least one of the pressures detected when the opening-closing means opens the secondary air passage and when the opening-closing means closes the secondary air passage; and malfunction detection ceasing means for ceasing the malfunction detection by the malfunction detecting means when the voltage of the battery changes by a value larger than a predetermined value when the pressure sensor detects a malfunction of the pressure variation in the secondary air passage for detecting a malfunction of at least one of the pump and the opening-closing means by the malfunction detecting means.