Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1988-01-20
1989-01-31
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, 123416, 123417, F02M 5100
Patent
active
048008575
ABSTRACT:
An apparatus for learn-controlling the air-fuel ratio for an internal combustion engine is disclosed. Every time area-wise learning correction coefficients for a predetermined number of different engine running condition areas are corrected, it is judged whether or not the deviations of the present area-wise learning correction coefficients for said areas from a reference value have the same direction. If all the deviations have the same direction, a mean value of said deviations or a minimum value among the deviations in terms of the absolute value is calculated. The calculated mean or minimum value is added to a global learning correction coefficient stored in global learning correction coefficient storing means to thereby rewrite the stored data. The mean or minimum value is regarded as a deviation component due to a change in the air density which may uniformly be employed for all the areas and is substituted for the global learning correction coefficient. Thus, it is possible to promptly learn a deviation component due to a change in the air density, and it is therefore possible to effect excellent learning control of the air-fuel ratio even when the vehicle abruptly goes up or down a slope.
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Nelli Raymond A.
Nippon Denshi Kiki Co., Ltd.
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