AIR FLOW RATE SENSOR CALIBRATION DEVICE

摘要

Provided is an air flow rate sensor calibration device which enables control for completely shutting off EGR during traveling without increasing NOx emission and enables improvement in the detection accuracy of intake air quantity. An air flow rate sensor calibration device is provided with: an engine brake detection unit (4) which detects that the speed is being reduced by the activation of an engine brake caused by the release of an accelerator during traveling; an EGR complete shut-off control unit (6) which performs control for completely shutting off an EGR valve (5) while the speed is being reduced by the activation of the engine brake; a basic formula calculation unit (7) which calculates the intake air quantity by a basic formula when EGR is completely shut-off; a volumetric efficiency correction calculation unit (8) which corrects and calculates a variation in volumetric efficiency by multiplying the value calculated by the basic formula by a correction term; a calibrated value storage unit (9) which learns a difference between the calculated value of the intake air quantity and the detected value of the intake air quantity by an MAF sensor (3) and stores the difference as the calibrated value; and a calibration calculation unit (10) which adds the calibrated value to the detected value of the intake air quantity by the MAF sensor (3) and sets the result as the intake air quantity.