Air-fuel ratio control apparatus for use in engine

Details Air-fuel ratio control apparatus for use in engine Air-fuel ratio control apparatus for use in engine

1991-12-10

1993-09-14

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123695, F02D 4114

Patent

active

052439526

ABSTRACT:
An air-fuel ratio control apparatus for an internal combustion engine which is equipped with an air-fuel ratio sensor for sensing an actual air-fuel ratio of a mixture to be introduced into the engine and a target air-fuel ratio setting section for setting a target air-fuel ratio of the engine. Also included is a controlled-amount calculating section for setting an optimal feedback gain on the basis of a predetermined dynamic model of the engine to calculate a controlled amount in accordance with the predetermined optimal feedback gain so that the actual air-fuel ratio becomes equal to the target air-fuel ratio. A fuel supply amount to the engine is determined on the basis of the calculated controlled amount, and the control responsiveness of the controlled-amount calculating section is suppressed when the engine is in a speed-decreasing state. This arrangement can adequately control the air-fuel ratio of the engine irrespective of the engine speed-decreasing state.

REFERENCES:
patent: 4241710 (1980-12-01), Peterson, Jr. et al.
patent: 4270503 (1981-06-01), Pomerantz
patent: 4466411 (1984-08-01), Hasegawa et al.
patent: 4489696 (1984-12-01), Kobayashi et al.
patent: 4561403 (1985-12-01), Oyama et al.
patent: 4628883 (1986-12-01), Kataoka

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