Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1986-09-17
1988-06-21
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, 123486, 123436, F02M 5100
Patent
active
047519061
ABSTRACT:
A method of effecting feedback control of the air-fuel ratio of an air-fuel mixture supplied to an internal combustion engine to a first predetermined value, by correcting a basic fuel supply quantity by the use of a correction coefficient variable in response to the output of an exhaust gas ingredient concentration sensor, when the engine is operating in a predetermined feedback control region. A predetermined engine low-load operating region outside the predetermined feedcback control region is defined by at least one parameter representing load on the engine. When the engine enters the predetermined low-load operating region, the correction coefficient is gradually decreased until the air-fuel ratio of the air-fuel mixture is increased to a second predetermined value leaner than the first predetermined value. When the engine enters the predetermined feedback control region from the predetermined low-load operating region, the initial value of the correction coefficient is set to the product of a value of the correction coefficient obtained immediately before the engine enters the predetermined feedback control region and a predetermined enriching coefficient, and the set initial value is gradually increased until the air-fuel ratio of the air-fuel mixture is decreased to the first predetermined value.
REFERENCES:
patent: 4584979 (1986-04-01), Fujimura et al.
patent: 4592325 (1986-06-01), Nakagawa
patent: 4601809 (1986-06-01), Kitahara
patent: 4608956 (1986-09-01), Katoh et al.
patent: 4644921 (1987-02-01), Kobayashi et al.
patent: 4646699 (1987-05-01), Yasuoka et al.
Wazaki Yoshio
Yatabe Fumio
Honda Giken Kogyo K.K.
Lesler Arthur L.
Nelli Raymond A.
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