Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Reexamination Certificate
2005-07-12
2005-07-12
Chin, Gary (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
C701S029000, C340S450300
Reexamination Certificate
active
06917865
ABSTRACT:
There is provided an engine oil degradation-determining system which is capable of accurately detecting whether or not engine oil has been replenished, to thereby enhance accuracy of determination as to a degradation level of engine oil in use, at a low cost. A crankshaft angle sensor detects the engine rotational speed of an internal combustion engine. An ECU calculates a cumulative revolution number indicative of a degradation level of engine oil. An oil level sensor detects an oil level of the engine oil. When the detected oil level, which was equal to or lower than a predetermined lower limit level before stoppage of the engine, is equal to or higher than a predetermined higher limit level after start operation following the stoppage, the calculated cumulative revolution number is corrected in the direction of indicating a lower degradation level.
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patent: 5006829 (1991-04-01), Miyamoto et al.
patent: 6463967 (2002-10-01), Boyle
Arai Takashi
Hashimoto Hiroshi
Chin Gary
Honda Motor Co. Ltd.
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