Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2005-11-22
2005-11-22
Argenbright, Tony M. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C701S029000, C701S101000, C701S102000, C701S110000, C073S116070, C073S117020, C073S117020, C073S118040
Reexamination Certificate
active
06968268
ABSTRACT:
A misfire detector calculates the engine speed fluctuation quantity Δωn for a predetermined period of time on the basis of the average engine speed on, which is the reciprocal of the time T120n that the crankshaft of the engine takes to turn 120 degrees. By comparing the calculated engine speed fluctuation quantity Δωn with a misfire determination value REF, from which it can be determined whether the engine is misfiring, the misfire detector determines whether the engine is misfiring. The misfire detector detects the rotational fluctuation per combustion stroke of each engine cylinder and learns the variation of the detected rotational fluctuation values during normal combustion. From this learned value and the detected rotational fluctuation value per combustion stroke of the cylinder, the misfire detector determines whether the cylinder is misfiring or not.
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Ma gawa Yoshinori
Wakahara Keiji
Yamada Jun
Argenbright Tony M.
DENSO Corporation
Hoang Johnny H.
Nixon & Vanderhye P.C.
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