Patent ID: 6742379
Filing Date: 2004-06-01
Classification: F02D,G01N

Abstract:
An intake air oxygen concentration sensor calibration, device comprising:an oxygen concentration sensor provided in a prescribed arrangement along an intake passageway of an internal combustion engine to detect a concentration of oxygen contained in intake air; intake passageway pressure detection means that detects pressure in the intake passageway; calibration coefficient calculation means that calculates a calibration coefficient used to calibrate an output of the oxygen concentration sensor based on the intake passageway pressure detected by the intake passageway pressure detection means and a reference output value of the oxygen concentration sensor previously stored in memory; calibration means that calibrates the output of the oxygen concentration sensor based on the calibration coefficient calculated by the calibration coefficient calculation means; air-fuel ratio detection means that is provided in a prescribed arrangement along an exhaust passageway of the internal combustion engine to detect an exhaust air-fuel ratio of an exhaust gas; and calibration coefficient correction means that corrects the calibration coefficient based on one of an air-fuel ratio feedback correction coefficient calculated from the exhaust air-fuel ratio detected by the air-fuel ratio detection means and the exhaust air-fuel ratio itself detected by the air-fuel ratio detection means.