Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2011-03-01
2011-03-01
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
C073S114330
Reexamination Certificate
active
07899608
ABSTRACT:
A method of identifying misfires in an engine including: running the engine; measuring the pressure pulses from the exhaust; generating a waveform from the measured pulses; dividing the waveform into segments; associating each waveform segment with the cylinder which generated the pulse; and examining each segment for features which indicate a misfire. Also disclosed is methodology for checking the performance of an engine including cam timing and identifying the probable cause(s) of misfires. This includes generating a cylinder pressure waveform from the measured pressure changes in a cylinder and analyzing the magnitude and timing of at least one of the pressure changes in such cylinder. Further disclosed is methodology for analyzing the pressure changes in the engine's intake manifold and in the crankcase. Finally, additional diagnostic procedures are disclosed for: checking the ignition timing of an engine; and using the apparatus and methods with additional instrumentation including gas analyzers.
REFERENCES:
patent: 4441360 (1984-04-01), Dooley et al.
patent: 4622939 (1986-11-01), Matekunas
patent: 5355713 (1994-10-01), Scourtes et al.
patent: 6560526 (2003-05-01), Matekunas et al.
Pederson Neal R.
Thompson Bernie C.
Morgan DeWitt M.
Vo Hieu T
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