Diagnostic method and diagnostic system for multicylinder internal combustion engine

A diagnostic method for a multicylinder internal combustion engine is provided. The method comprises determining that malfunction pertaining to the air-fuel ratio has occurred when degree of the rotational fluctuation is equal to or more than a first determination value; determining that malfunction...

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Bibliographische Detailangaben
1. Verfasser:	HINO SEIJI
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 IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES 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 TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	A diagnostic method for a multicylinder internal combustion engine is provided. The method comprises determining that malfunction pertaining to the air-fuel ratio has occurred when degree of the rotational fluctuation is equal to or more than a first determination value; determining that malfunction pertaining to the air-fuel ratio has not occurred when the degree of the rotational fluctuation is equal to or less than a second determination value that is smaller than the first determination value; and changing mode of engine control when the degree of the rotational fluctuation is smaller than the first determination value and greater than the second determination value. After the changing, the determining that malfunction pertaining to the air-fuel ratio has occurred is repeated.