Apparatus for controlling the air-fuel ratio of an internal comb

Details Apparatus for controlling the air-fuel ratio of an internal comb Apparatus for controlling the air-fuel ratio of an internal comb

1984-03-26

1985-07-02

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 123492, F02B 308

Patent

active

045261474

ABSTRACT:
The invention is directed to an apparatus for controlling the air-fuel ratio, in particular of an internal combustion engine. The apparatus includes a sensor responsive to this ratio such as an oxygen sensor or the like and a circuit arrangement for evaluating the sensor output signal. The circuit arrangement includes means to compensate for the offset voltage influence thereby permitting a precise control of the air-fuel ratio in a Lambda range in which the dependent relationship between the sensor output and the sensor input signals is barely distinctive. For this purpose, the influence of the offset voltage of the control amplifiers used is measured at regular or irregular intervals and stored in analog or digital format. On the one hand, this stored quantity may be used to apply to the inputs of the control amplifiers a compensating voltage acting in opposition to the input offset voltage or, on the other hand, to subtract from the operational amplifier output the voltage portion resulting from offset voltages. The apparatus of the invention is also suitable for controlling the air-fuel ratio of heating equipment.

REFERENCES:
patent: 4393841 (1983-07-01), Drews et al.
patent: 4445482 (1984-05-01), Hasegawa et al.
patent: 4449508 (1984-05-01), Glockler et al.
patent: 4450812 (1984-05-01), Otsuka et al.
patent: 4454846 (1984-06-01), Suzuki et al.

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