Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Patent
1997-01-27
1998-05-26
Dombroske, George M.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
73115, 73116, 731173, G01M 1500
Patent
active
057583072
ABSTRACT:
A misfire detection system and method for use in conjunction with an internal combustion engine. An engine cylinder has a pressure sensor disposed therein for providing a signal indicative of the pressure in the cylinder's combustion chamber. Compression pressure measurements are obtained at crankshaft angles reached prior to the top dead center position of piston travel. For crankshaft angles greater than that at which top dead center is reached, the pressure measurements are reflected about a vertical axis extending through the top dead center point. The reflected compression pressures for crankshaft angles reached after the top dead center point are subtracted from the actual compression chamber measurements obtained over those crankshaft angles during the power stroke of the engine. The difference values are integrated over a range of crankshaft angles to produce a difference pressure integral which is normalized through multiplication by an optional factor and then subsequent division by the maximum pressure occurring in the compression chamber during the engine's power stroke. The resulting normalized integral value is compared to a threshold, below which partial or complete engine misfire is presumed.
REFERENCES:
patent: 4050296 (1977-09-01), Benedict
patent: 4147054 (1979-04-01), Hohenberg et al.
patent: 4539841 (1985-09-01), Schroeder et al.
patent: 4892075 (1990-01-01), Iriyama et al.
patent: 5020360 (1991-06-01), Brosi et al.
patent: 5105657 (1992-04-01), Nakaniwa
patent: 5109825 (1992-05-01), Joos et al.
patent: 5193513 (1993-03-01), Marko et al.
patent: 5351528 (1994-10-01), Fukui et al.
patent: 5386723 (1995-02-01), Wier
patent: 5415036 (1995-05-01), Park
patent: 5442954 (1995-08-01), Fukui et al.
patent: 5505077 (1996-04-01), Fukui et al.
patent: 5559280 (1996-09-01), Kovacich et al.
patent: 5563332 (1996-10-01), Yasuda
patent: 5571958 (1996-11-01), Hoshina
patent: 5574217 (1996-11-01), McCombie
Sae Technical Paper No. 940379--A New Combustion Pressure Sensor for Advanced Engine Management--Mar. 1994.
Haefner Donald R.
Mazur Joseph S.
Dombroske George M.
Eaton Corporation
Johnston Roger A.
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