Operating state determination device for engine, vehicle, operating state determination method for engine
AssigneeMitsubishi Heavy Industries Engine & Turbocharger, Ltd.
InventorsRyo Sase, Shintarou Noguchi, Byeongil An
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Abstract
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.
Claims15
An operating state determination device for an engine mounted with a turbocharger and including a plurality of cylinders, the device comprising:
- a turbo rotation speed sensor detecting a temporal change of a turbo rotation speed of the turbocharger, for each cycle of the engine;
- and a processor and a storage medium storing program that causes the processor to:
- specify a first vibration component which is a waveform corresponding to each of the cylinders from the temporal change of the turbo rotation speed in one cycle of the engine;
- first integrate a frequency of an amplitude of the first vibration components for each of the cylinders over a plurality of cycles of the engine;
- and calculate a variation of combustion states in the plurality of cylinders by comparing integration results of the first integrating step among the cylinders, wherein the specifying step specifies the first vibration component based on a temporally increasing region of the temporal change, and wherein the program further causes the processor to:
- determine presence or absence of an abnormality in the engine based on the calculation result of the calculate step.
An operating state determination device for an engine mounted with a turbocharger and including a plurality of cylinders, the device comprising:
- a turbo rotation speed sensor detecting a temporal change of a turbo rotation speed of the turbocharger, for each cycle of the engine;
- and a processor and a storage medium storing program that causes the processor to:
- specify a first vibration component which is a waveform corresponding to each of the cylinders from the temporal change of the turbo rotation speed in one cycle of the engine;
- first integrate the first vibration components for each of the cylinders over a plurality of cycles of the engine;
- calculate a variation of combustion states in the plurality of cylinders by comparing integration results of the first integrate step among the cylinders;
- and specify a rank of the first vibration component for each of the cylinders included in the temporal change of the turbo rotation speed, for each cycle of the engine, wherein the first integrate step integrates a frequency of the ranks for each of the cylinders over the plurality of cycles of the engine.
An operating state determination method for an engine mounted with a turbocharger and including a plurality of cylinders, the method comprising:
- a step of detecting a temporal change of a turbo rotation speed of the turbocharger, for each cycle of the engine;
- a step of specifying a first vibration component which is a waveform corresponding to each of the cylinders from the temporal change of the turbo rotation speed in one cycle of the engine;
- a step of integrating a frequency of an amplitude of the first vibration components for each of the cylinders over a plurality of cycles of the engine;
- a step of calculating a variation of combustion states in the plurality of cylinders by comparing integration results of the first vibration components among the cylinders;
- and a step of determining presence or absence of an abnormality in the engine based on the calculation result of the calculate step, wherein the step of specifying the first vibration component includes specifying the first vibration component based on a temporally increasing region of the temporal change of the turbo rotation speed.
Dependencies are inferred from the claim text.