Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1988-09-26
1990-04-10
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123489, 204425, F02D 4114, G01N 2758
Patent
active
049150774
ABSTRACT:
An air-fuel control apparatus comprises an air-fuel ratio sensor comprising a gap portion for introducing exhaust gas generated from an engine, a solid electrolyte oxygen pump for controlling a partial pressure of oxygen in the gap portion and a solid electrolyte oxygen sensor producing an electromotive force in response to a proportion of the partial pressure of oxygen in the gap portion and a partial pressure of oxygen in other than the gap portion. The air-fuel control apparatus is further provided with an electronic control device including a pump current stopping means which controls a pump current from the solid electrolyte oxygen pump so that the electromotive force generated by the solid electrolyte oxygen sensor is maintained at a constant value, and controls not to feed the pump current when the engine is stopped, and a control device which operates the optimum quantity of fuel supply to thereby effect an air-fuel control by a gas mixture producing mean in an operational condition that the engine is not subjected to a feed-back control on the basis of an output signal from the air-fuel ratio sensor, and controls not to feed a pump current by the actuation of the pump current stopping means when the revolution number of the engine is determined to be lower than a predetermined value, i.e. the engine is stopped in an operational condition that the engine is subjected to the feed-back control on the basis of the pump current.
REFERENCES:
patent: 4665874 (1987-05-01), Kawanabe et al.
patent: 4698209 (1987-10-01), Hashimoto et al.
patent: 4707241 (1987-11-01), Nakagawa et al.
patent: 4753203 (1988-06-01), Yamada
patent: 4762604 (1988-08-01), Asakura et al.
patent: 4765298 (1988-08-01), Kojima et al.
Inoue Hitoshi
Nishida Shin-ichi
Takahashi Toshihisa
Uchinami Masanobu
Mitsubishi Denki & Kabushiki Kaisha
Wolfe Willis R.
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