| CPC F02D 41/401 (2013.01) [F02D 13/0234 (2013.01); F02D 41/009 (2013.01); F02D 2041/389 (2013.01); F02D 2200/024 (2013.01)] | 11 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 at a specific timing after an intake valve of the cylinder of the engine is closed;
outputting to a controller, by an in-cylinder pressure sensor, a signal corresponding to a pressure inside the cylinder at least at a timing when a specific crank angle period has passed from the fuel injection timing; and
determining, by the controller, a property of the fuel injected by the injector, by comparing a pressure value measured by the in-cylinder pressure sensor with a reference pressure value inside the cylinder measured at a timing when the specific crank angle period has passed after a standard fuel is injected into the cylinder at the specific timing, 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,
a corresponding plurality of in-cylinder pressure sensors for the plurality of cylinders output the pressure values of the plurality of cylinders,
the controller compares an average value of the plurality of pressure values with the reference pressure value to determine the property, and
the specific crank angle period is set to be shorter as the cycle progresses such that the pressure value is measured without an effect of temperature increase inside the cylinder.
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