| CPC F02D 41/401 (2013.01) [F02D 13/0234 (2013.01); F02D 35/023 (2013.01); F02D 41/009 (2013.01)] | 14 Claims |
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1. A method of controlling an engine, comprising the steps of:
during motoring of the engine, injecting, by an injector, fuel for analysis into a cylinder of the engine at a specific timing after an intake valve of the cylinder is closed;
acquiring, by a controller, a crank angle period from a start timing of the fuel injection to a timing of a pressure inside the cylinder reaching a reference pressure, in response to signals of a crank angle sensor and an in-cylinder pressure sensor; and
determining, by the controller, a property of the fuel injected by the injector by comparing the acquired crank angle period with a reference crank angle period, the reference crank angle period being from an injection start timing when a standard fuel is injected into the cylinder to a timing of the pressure inside the cylinder reaching the reference pressure, wherein
the cylinder is one of a plurality of cylinders,
the cylinder into which the injector injects the fuel for analysis is the cylinder, out of the plurality of cylinders, whose intake valve is closed first after a crankshaft of the engine starts rotation,
for each of the plurality of cylinders, the injector injects the fuel for analysis as a cycle of the engine progresses,
the controller acquires the crank angle period for each of the plurality of cylinders,
the controller compares an average value of the acquired plurality of crank angle periods with the reference crank angle period to determine the property, and
the reference pressure becomes lower as the cycle of the engine progresses.
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