Air-fuel ratio controller for internal combustion engine

Details Air-fuel ratio controller for internal combustion engine Air-fuel ratio controller for internal combustion engine

1998-07-28

1999-08-10

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

12333922, 123674, 123680, F02M 300

Patent

active

059342480

ABSTRACT:
An air-fuel ratio controller for an internal combustion engine, which controller is capable of: properly correcting an air-fuel ratio after a start-up explosion; preventing inconveniences such as occurrence of an engine stall, a decrease in an engine rotational speed, and a discharge of exhaust gases containing harmful components; and, allocating an idle time-learning value with reference to a rotational engine speed that is obtained at the time of engine start-up, thereby enhancing convenience of use. To this end, the air-fuel ratio controller is provided with an additional feature whereby it is determined, in executing a rotational engine speed-determining item of an idle time-learning region condition, that the rotational engine speed-determining item is satisfied when a rotational engine speed is equal to or less than a value obtained by addition of an ISC target rotational speed and a predetermined value, the predetermined value including either a fixed value or a variable value, the variable value being mapped on a table for each water temperature.

REFERENCES:
patent: 4747379 (1988-05-01), Oba
patent: 4864997 (1989-09-01), Miyachi
patent: 5269272 (1993-12-01), Nakaniwa
patent: 5337557 (1994-08-01), Toyoda
patent: 5722368 (1998-03-01), Sakai

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