Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1981-02-04
1982-12-28
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
204195S, 204 1T, G01N 2704, F02B 300, F02B 308, G01N 2758
Patent
active
043656048
ABSTRACT:
A system for feedback control of air/fuel ratio in an IC engine, utilizing an oxygen-sensitive device which is provided with a heater and disposed in exhaust gas to provide a feedback signal. This device has a porous solid electrolyte layer with a measurement electrode layer on the outside and a reference electrode layer on the inside facing a substrate. The control system includes a sub-system to apply a voltage to the heater and force a DC current to flow through the solid electrolyte layer to cause migration of oxygen ions therethrough to thereby establish a reference oxygen partial pressure on the inner side of the solid electrolyte layer. To prevent great changes in the reference oxygen partial pressure by the influence of the exhaust gas temperature, the sub-system comprises sensors to detect the engine operating condition and control means for gradually varying both said voltage and said current according as the detected operating condition varies. For example, the voltage and current may be varied each by using a combination of a variable resistor and a stepping motor or a combination of fixed resistances and electrically controllable switches connected respectively in parallel with the resistances.
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Nelli Raymond A.
Nissan Motor Co,. Ltd.
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