Apparatus for learn-controlling air-fuel ratio for internal comb

Internal-combustion engines – Charge forming device – Fuel injection system

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123440, 123416, 123417, F02M 5100

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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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patent: 4726344 (1988-02-01), Ando et al
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patent: 4748956 (1988-06-01), Iwaki

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