Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Shintarou Noguchi

Ryo Sase

Byeongil An

A temporal change of a turbo rotation speed of a turbocharger is detected for each cycle of an engine. A first vibration component corresponding to each of cylinders is specified from a pulsation component included in the temporal change of the turbo rotation speed, and the first vibration components for each of the cylinders are integrated over a plurality of cycles. A variation of combustion states in the plurality of cylinders is calculated by comparing integration results among the cylinders.

Operating state determination device for engine, vehicle, operating state determination method for engine

The present invention provides a device and method for detecting a misfire in an engine, the device being provided with: a rotation speed sensor () as a supercharger rotation speed measurement unit for measuring a rotation speed (Nt) of a supercharger (); a misfire index calculation unit () that calculates a misfire index (Yt) from a degree of change in the rotation speed (Nt) of the supercharger (), the rotation speed being measured by the rotation speed sensor (); and a misfire determination unit () that determines a misfire in an engine () when the misfire index (Yt) calculated by the misfire index calculation unit () exceeds a pre-set determination value (D).

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Tokyo, Japan

Shintarou Noguchi