Method for feedback controlling air and fuel ratio of the mixtur

Details Method for feedback controlling air and fuel ratio of the mixtur Method for feedback controlling air and fuel ratio of the mixtur

1989-02-14

1990-06-19

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123492, 123493, F02D 4114

Patent

active

049343289

ABSTRACT:
A method for feedback controlling air-fuel ratio of the mixture supplied to an internal combustion engine having a plurality of cylinders comprises the steps of, detecting respective air-fuel ratios of the exhaust gas from the respective cylinders with an air-fuel ratio sensor having a substantially linear output characteristic; calculating an average air-fuel ratio by using the latest detected air-fuel ratios of the respective cylinders; determining a fundamental feedback correction coefficient .beta..sub.0 for a cylinder of which air fuel ratio is feedback controlled next; retrieving a learning correction coefficient .beta..sub.1 for the cylinder of which air-fuel ratio is feedback controlled next from a learning map prepared by learning for the corresponding cylinder; and determining new learning correction coefficients .beta..sub.1 for the respective cylinders using respective deviations of the respective detected current air-fuel ratios from the latest average air-fuel ratio calculated in the previous step, whereby air-fuel ratio control at any desired air-fuel ratio is carried out with a high accuracy and with a uniform air-fuel ratio throughout the whole cylinders.

REFERENCES:
patent: 4467770 (1984-08-01), Arimura et al.
patent: 4483300 (1984-11-01), Hosaka et al.
patent: 4627402 (1986-12-01), Saito et al.
patent: 4703430 (1987-10-01), Amano et al.
patent: 4766870 (1988-08-01), Nakajima et al.

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