Air-fuel ratio controller

Details Air-fuel ratio controller Air-fuel ratio controller

1981-07-23

1982-12-21

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Gaseous fuel and air mixer

123440, F02M 5102

Patent

active

043643647

ABSTRACT:
An air-fuel ratio controller adjusts the pressure of gaseous hydrocarbon fuel delivered to an internal combustion engine in order to minimize the emission of undesirable gases, specifically carbon monoxide and oxides of nitrogen. The controller includes a zirconium oxide sensor exposed to the engine exhaust gases, a thermocouple temperature sensor, an electronic signal conditioner which provides a linearized ramp signal, adjustable threshold trigger circuits which fire relays at specific ramp signal values and provide fail-safe operation, electropneumatic valves which respond to the relays and provide a fluid control signal, suitable adjustable flow restrictions and a gas pressure regulator which responds to the fluid control signal and regulates the pressure and thus the flow of gas to the internal combustion engine. Changes in the oxygen content of the exhaust gas are sensed by the zirconium oxide sensor and this change causes the electric valves to pressurize or depressurize the gas pressure regulator diaphragm causing an increase or decrease in the pressure of the gas delivered to the engine thus driving the exhaust gas oxygen level toward the desired value.

REFERENCES:
patent: 4046120 (1977-09-01), Laprade et al.
patent: 4102313 (1978-07-01), Laprade et al.
patent: 4188919 (1980-02-01), Bruce
patent: 4294214 (1981-10-01), Treible et al.

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