Method for controlling air/fuel ratio in internal combustion eng

Details Method for controlling air/fuel ratio in internal combustion eng Method for controlling air/fuel ratio in internal combustion eng

1981-10-16

1984-02-14

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123480, 123489, 36443106, F02B 300

Patent

active

044309767

ABSTRACT:
In a feedback control system for air/fuel ratio control of an internal combustion engine, an integration correcting amount is derived from the output signal of a gas sensor indicative of the concentration of an exhaust gas component, and an engine condition correcting amount is selected from a memory in which a plurality of engine condition correcting amounts are prestored in the form of a map. The engine condition correcting amount is renewed in accordance with the variation in the value of the integration correcting amount only within a given period of time or within an interval corresponding to a given number of rotations of the engine crankshaft from an instant of detection of the variation of the gas sensor output level. Thus, the engine condition correcting amount is renewed only when the output signal level of the gas sensor is reliable. In the case that the gas sensor output level does not change for a relatively long period of time, the integration correction amount is set to a standard value, while the engine condition correcting amount is not changed, using prestored data.

REFERENCES:
patent: 4306523 (1981-12-01), Takeda
patent: 4319451 (1982-03-01), Tajima et al.
patent: 4321903 (1982-03-01), Kondo et al.
patent: 4345561 (1982-08-01), Kondo et al.
patent: 4348727 (1982-09-01), Kobayashi et al.
patent: 4348728 (1982-09-01), Sagisaka et al.
patent: 4355616 (1982-10-01), Tamura et al.
patent: 4365299 (1982-12-01), Kondo et al.

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