Patent ID: 7107762
Filing Date: 2006-09-19
Classification: F01N

Abstract:
1. A secondary air supplying apparatus comprising: secondary air supplying means for supplying secondary air to upstream of an emission purifying device in an exhaust system of an internal combustion engine; coolant temperature detecting means for detecting a temperature of a coolant for the engine; intake air temperature detecting means for detecting a temperature of intake air; supply controlling means for actuating the secondary air supplying means in accordance with a predetermined secondary air supply condition; and summing means for summing an actuation period of the secondary air supplying means and storing a sum, wherein the supply controlling means stops the supply of secondary air by the secondary air supplying means if the sum by the summing means reaches a predetermined upper limit, and wherein the summing means resets the sum if at a predetermined point before the actuation of the secondary air supplying means a difference between the coolant temperature detected by the coolant temperature detecting means and the intake air temperature detected by the intake air temperature detecting means is not more than a first predetermined value.