Patent ID: 7647764
Filing Date: 2010-01-19
Classification: F01N,F02D,Y02T

Abstract:
1. A method for determining an error in temperature measurement of an exhaust-gas treatment system of a combustion engine, comprising: providing a first variable that characterizes an exhaust gas mass flow rate in the exhaust-gas treatment system; providing a second variable corresponding to a temperature that characterizes an exhaust-gas temperature upstream from the exhaust-gas treatment system; measuring, by a temperature sensor, at least one of a third variable corresponding to a measured temperature that characterizes the exhaust-gas treatment system and a fourth variable corresponding to a measured temperature that characterizes an exhaust gas temperature downstream from the exhaust-gas treatment system; calculating at least one of a fifth variable corresponding to a calculated temperature that characterizes the exhaust-gas treatment system and a sixth variable corresponding to a calculated temperature that characterizes the exhaust gas temperature downstream from the exhaust-gas treatment system, wherein the fifth variable and the sixth variable are calculated using the first variable and the second variable; calculating a difference between: a) one of the third variable and the fourth variable; and b) one of the fifth variable and the sixth variable; comparing the calculated difference with a threshold value; and recognizing an error when the calculated difference is greater than the threshold value.