Air-fuel ratio control system for automotive engine

Details Air-fuel ratio control system for automotive engine Air-fuel ratio control system for automotive engine

1990-02-14

1991-02-12

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123419, F02D 3300, F02M 700

Patent

active

049915550

ABSTRACT:
An air-fuel ratio control system for an automotive engine controls an air-fuel ratio at which fuel is delivered to the automotive engine to a desirable lean air-fuel ratio so as to maintain the automotive engine to operate with a predetermined degree of instability less than an allowable degree of instability. The air-fuel ratio control system sets a desirable lean air-fuel ratio to an air-fuel ratio shifted toward a side of more rich air-fuel ratios by a predetermined value from the leanest air-fuel ratio at which the automotive engine operates with a predetermined degree of instability and a lower guard of air-fuel ratio to an air-fuel ratio shifted toward a side of more lean air-fuel ratios by a predetermined value from the desirable lean air-fuel ratio.

REFERENCES:
patent: 4064846 (1977-12-01), Latsch et al.
patent: 4232643 (1980-11-01), Leshner et al.
patent: 4502442 (1985-03-01), Takakuwa et al.
patent: 4543934 (1985-10-01), Morita et al.
patent: 4683856 (1987-08-01), Matsuura et al.

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