Patent ID: 8291893
Filing Date: 2012-10-23
Classification: F02D,G01N

Abstract:
1. A device for determining activation of an exhaust gas sensor, comprising: a heater for heating the exhaust gas sensor at a time of start of an internal combustion engine; acquiring means which acquires a physical amount having a correlation with a temperature of the exhaust gas sensor; and determining means which determines an activation state of the exhaust gas sensor based on whether or not such a time period that desorbed species are substantially eliminated from the exhaust gas sensor has elapsed after the adsorbed species which are exhaust gas components adsorbed on the exhaust gas sensor start to be desorbed, at the time of start of the internal combustion engine, wherein the determining means includes temperature determining means which determines whether or not the temperature of the exhaust gas sensor has reached a predetermined temperature which is set in advance within a temperature region not lower than a desorption start temperature which is a temperature at which the adsorbed species which are the exhaust gas components adsorbed on the exhaust gas sensor start to be desorbed, based on the physical amount, and activation determining means which determines the activation state of the exhaust gas sensor based on an elapsed time from a time point when the temperature of the exhaust gas sensor reaches the predetermined temperature.