Engine start abnormality diagnosis apparatus

An engine start abnormality diagnosis apparatus determines a cause of a long cranking abnormality in which, when an engine including cylinders is started, start of the engine is not completed even if a cranking period is equal to or greater than a predetermined time. The engine start abnormality dia...

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Bibliographische Detailangaben
Hauptverfasser:	Degura, Kyouhei, Matsuda, Noriyuki, Oota, Yasuhiro, Iizuka, Kei
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBUSTION ENGINES COMBUSTION ENGINES IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INTERNAL-COMBUSTION PISTON ENGINES LIGHTING MECHANICAL ENGINEERING STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDEDFOR STARTING OF COMBUSTION ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	An engine start abnormality diagnosis apparatus determines a cause of a long cranking abnormality in which, when an engine including cylinders is started, start of the engine is not completed even if a cranking period is equal to or greater than a predetermined time. The engine start abnormality diagnosis apparatus includes a rotation speed detector and an abnormality diagnosis processor. The rotation speed detector detects a rotation speed of a crankshaft of the engine when at least one of the cylinders is in a latter stage of a compression stroke. The abnormality diagnosis processor determines that the cause of the long cranking abnormality is an electric system abnormality when the rotation speed is less than a predetermined threshold, and determines that the cause of the long cranking abnormality is a combustion abnormality when the rotation speed is equal to or greater than the threshold.