AIR FLOW RATE SENSOR CALIBRATION DEVICE

PROBLEM TO BE SOLVED: To provide an air flow rate sensor calibration device which performs control for completely shutting off an EGR during traveling without increasing NOemission and achieves improvement in detection accuracy of the intake air quantity.SOLUTION: The air flow rate sensor calibratio...

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Bibliographische Detailangaben
Hauptverfasser:	HANAMURA YOSHIFUMI, ISHII NOBUTAKA, ASO MITSUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MECHANICAL ENGINEERING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an air flow rate sensor calibration device which performs control for completely shutting off an EGR during traveling without increasing NOemission and achieves improvement in detection accuracy of the intake air quantity.SOLUTION: The air flow rate sensor calibration device includes: an engine brake detecting part 4 which detects that the speed is being reduced by the operation of an engine brake by turning the accelerator off during traveling; an EGR complete shut-off control part 6 which performs control for completely shutting off an EGR valve 5 during deceleration with the engine brake; a basic formula calculation part 7 which calculates the intake air quantity by a basic formula when the EGR is completely shut-off; a volumetric efficiency correction calculation part 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 part 9 which learns a difference between the calculated value of the intake air quantity and the value of the intake air quantity detected by an MAF sensor 3 and stores the difference as a calibrated value; and a calibration calculation part 10 which adds the calibrated value to the value of the intake air quantity detected by the MAF sensor 3 and sets the result as the intake air quantity.