F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
123/60, 341/38.1
F02D 41/14 (2006.01) F02D 41/34 (2006.01) F02D 41/36 (2006.01) F02B 1/04 (2006.01)
Patent
CA 1293554
- 1 - Abstract: The present invention relates to a method for feedback controlling air-fuel ratio of the mixture supplied to an internal combustion engine having a pluraltiy of cylinders. The method 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 and determining a fundamental feedback correction coefficient .beta.0 for a cylinder of which air fuel ratio is feedback controlled next. The method further includes the steps of retrieving a learning correction coefficient .beta.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.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. As a result, 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.
591759
Amano Matsuo
Ishii Junichi
Kurihara Nobuo
Sato Nobuo
Amano Matsuo
Hitachi Ltd.
Ishii Junichi
Kirby Eades Gale Baker
Kurihara Nobuo
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