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
Vo, Hieu T. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C123S406580
Reexamination Certificate
active
06968269
ABSTRACT:
To detect a stroke reliably at the time of the start of the engine when a stroke cannot be detected based on crank pulses alone.A stroke is detected based on a difference ΔN between the engine rotational speeds at top and bottom dead centers and a flag FNis changed depending upon whether a temporary stroke set before a stroke has been detected and the detected stroke coincide with each other or not. Simultaneously, a stroke is detected based on a difference ΔP between the intake air pressures at two bottom dead centers and a flag Fpis changed depending upon whether a temporary stroke set before a stroke has been detected and the detected stroke coincide with each other or not. Then, when the flags FNand Fpcoincide with each other, the stroke detection is completed. When the detected stroke differs from the temporary stroke, the stroke is shifted by a phase of 360° and the crank pulses are renumbered.
REFERENCES:
patent: 6340020 (2002-01-01), Yamazaki et al.
patent: 2004/0244471 (2004-12-01), Sawada et al.
patent: 2004/0255902 (2004-12-01), Sawada et al.
patent: 2004/0261767 (2004-12-01), Sawada et al.
patent: 2005/0021220 (2005-01-01), Nakamura et al.
patent: 2000-352348 (2000-12-01), None
patent: 2002-147269 (2002-05-01), None
Hogan & Hartson LLP
Vo Hieu T.
Yamaha Hatsudoki Kabushiki Kaisha
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