Measuring and testing – Internal combustion engine or related engine system or... – Fuel system or part thereof
Reexamination Certificate
2010-02-17
2011-12-13
Kirkland, III, Freddie (Department: 2855)
Measuring and testing
Internal combustion engine or related engine system or...
Fuel system or part thereof
Reexamination Certificate
active
08074504
ABSTRACT:
The present invention provides a malfunction diagnosing apparatus for an engine which enables selection of a fuel to be supplied to a tank from fuels having different properties. The apparatus includes a determining unit determining whether fuel has been supplied to the tank, a sensor detecting a property of the fuel supplied from the tank to an injection valve, an air-fuel ratio control unit determining an air-fuel ratio correction amount according to a difference between a target air-fuel ratio and an actual air-fuel ratio and according to the property of the fuel sensed by the sensor to correct a fuel injection quantity using the air-fuel ratio correction amount, and a diagnosing unit that definitively diagnoses malfunctions of the determining unit, the sensor, and a fuel system, based on a combination of a determination by the determining unit, detection by the sensor, and the air-fuel ratio correction amount or the difference.
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Nishikawa Seiichiro
Suzuki Yusaku
Denso Corporation
Kirkland, III Freddie
Nixon & Vanderhye PC
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