Air-fuel control having two stages of operation

Details Air-fuel control having two stages of operation Air-fuel control having two stages of operation

1992-12-11

1993-10-12

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

60285, F02M 5100

Patent

active

052516059

ABSTRACT:
An air-fuel control that has two stages of operation. The control includes an EGO sensor interconnected to the exhaust system of an engine and a control assembly. In a first stage of operation, the engine is allowed to operate in an open loop condition. Periodically, however, the control momentarily moves to a second stage of operation. When in the second state, the control assembly ramps up the air-fuel ratio of the air-fuel mixture supplied to the engine until the EGO sensor changes state. The amount that the air-fuel ratio changed during this process is then compared with a nominal value to compute a correction factor. The correction factor is then used during the next open loop interval to increase or decrease the signal applied to the air-fuel distribution control and achieve a more optimum air-fuel mixture.

REFERENCES:
patent: 4494374 (1985-01-01), Kitahara et al.
patent: 4502444 (1985-03-01), Rubbo et al.
patent: 4594984 (1986-01-01), Raff et al.
patent: 4601273 (1986-07-01), Kitahara et al.
patent: 4825837 (1989-05-01), Nakagawa
patent: 4953351 (1990-09-01), Motz et al.
patent: 4993393 (1991-02-01), Hosoda et al.

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