Patent ID: 6604007
Filing Date: 2003-08-05
Classification: F02D,G01M

Abstract:
A test method for verifying correct production of engines having first and second fueling characteristics, wherein fueling of each of the engines is controlled by a respective electronic control module, wherein engines having the first fueling characteristic are designed to be equipped with a first type of exhaust gas oxygen sensor, and engines having the second fueling characteristic are designed to be equipped with a second type of exhaust gas oxygen sensor, and wherein each such exhaust gas oxygen sensor includes a heater element that is supplied with electrical current by the respective electronic control module during operation of a respective engine, the test method comprising the steps of:specifying an electrical resistance of the heater elements of said first and second types of exhaust gas oxygen sensors such that the electrical resistance of heater elements for the first type of exhaust gas oxygen sensor fall in a first range, and the electrical resistance of the heater elements for the second type of exhaust gas oxygen sensor fall in a second range; storing a calibration parameter in the electronic control module for each engine, where the parameter stored in engines having the first fueling characteristic corresponds to said first range of electrical resistance, and the parameter stored in engines having the second fueling characteristic corresponds to said second range of electrical resistance; starting a produced engine equipped with an exhaust gas oxygen sensor; detecting an electrical current supplied to the equipped exhaust gas oxygen sensor by the respective electronic control module; comparing the detected electrical current to the calibration parameter stored in the respective electronic control module; and indicating that the equipped exhaust gas oxygen sensor matches the produced engine if the detected electrical current matches the stored calibration parameter, and that the equipped exhaust gas oxygen sensor fails to match the produced engine if the detected electrical current does not match the stored calibration parameter.