Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1982-10-07
1985-07-02
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60285, 123440, 123489, 123589, F01N 320, F02B 3300
Patent
active
045260010
ABSTRACT:
A method for controlling the air-to-fuel ratio fed to an engine or other combustion device provides for periodically adjusting the air-to-fuel ratio to stoichiometric or near stoichiometric, within the response range of the conventional exhaust gas sensor employed. This establishes a reference point from which the setting of an air-to-fuel ratio proportioning device (e.g., carburetor) is established by moving its adjustment means a selected distance from its setting at the reference point. The selected value may be outside the normal response range of the sensor, either rich or lean of stoichiometric. The apparatus may include a sensor which generates an output signal which is compared against a reference signal by a comparator. When the output signal exceeds (or falls below) the reference signal, a timer to operate the proportioning device adjustment means in the desired direction for a stated interval of time is actuated. A separate timer operates the adjustment means towards stoichiometric at selected intervals to periodically establish the reference point.
REFERENCES:
patent: 3354931 (1967-11-01), Risse
patent: 3782347 (1974-01-01), Schmidt
patent: 4024706 (1977-05-01), Adawi
patent: 4088095 (1978-05-01), Aono
patent: 4099491 (1978-07-01), Reddy
patent: 4112880 (1978-09-01), Asano
patent: 4143623 (1979-03-01), Norimatsu
patent: 4169440 (1979-10-01), Taplin
patent: 4202301 (1980-05-01), Early
patent: 4377143 (1983-03-01), Hamburg
Burns Kenneth R.
Early Jack J.
Engelhard Corporation
Hart Douglas
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