Nissan Motor Company Limited

Toyota Jidosha Kabushiki Kaisha

Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Okamura Kenji

Hiroshi Kobayashi

Toshifumi Ichio

Takahito Nakashima

Kazuhiro Aoki

Kohki Sone

Tanaka Tetsuji

Shimoda Hiroki

Ono Junichi

Otsuka Takuji

Hirai Hiroki

Tabata Masaaki

A system for feedback control of air/fuel ratio in an IC engine, utilizing a recently developed 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 one side and a reference electrode on the other side facing a substrate. There is a circuit to supply a heating current to the heater and force a DC current to flow in the solid electrolyte layer to cause migration of oxygen ions through the solid electrolyte toward the reference electrode to thereby establish a reference oxygen partial pressure on the reference side of the solid electrolyte layer. To prevent lowering of this oxygen partial pressure while the engine is operated under a high-load condition and the feedback control is discontinued to feed the engine with a fuel-enriched mixture, the control system includes operating condition sensor means and switching means to interrupt the supply of the current to the heater in response to a command signal from the sensor means and, optionally, current regulating means to increase the intensity of current flowing in the solid electrolyte also in response to the command signal.

System for feedback control of air/fuel ratio in IC engine with

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Zushi, Japan

Okamura Kenji