Denso Corporation

Nippondenso Co., Ltd.

Kenichi Ono

Mikiyasu Matsuoka

Yuji Yamada

Takao Mishima

Takamasa Oguri

Atsushi Suzuki

Masumi Kinugawa

Masakazu Ninomiya

An Osensor has a sensor element, which includes a solid electrolyte layer and a pair of electrodes. The solid electrolyte layer is held between the electrodes. The electrodes include an atmosphere side electrode, which becomes a positive side at a time of outputting an electromotive force from the sensor element, and an exhaust side electrode, which becomes a negative side at the time of outputting the electromotive force from the sensor element. A resistor is provided in an electric path that connects between the atmosphere side electrode and a ground. When the sensor element generates the electromotive force, the resistor conducts an electric current, which is generated while using the electromotive force as an electric power source, to induce a change in an output characteristic of the Osensor.

Gas sensor control apparatus

An Osensor has a sensor element, which includes a solid electrolyte layer and a pair of electrodes. The solid electrolyte layer is held between the electrodes, which includes an atmosphere side electrode and an exhaust side electrode. A constant current circuit is installed in an electric path, which connects between the atmosphere side electrode and a ground, to induce a flow of a predetermined constant electric current between the electrodes through the solid electrolyte layer. When the sensor element generates an electromotive force, the constant current circuit conducts an electric current, which is generated while using the electromotive force of the sensor element as an electric power source, to induce the flow of the predetermined constant electric current between the electrodes in an electromotive force range, which is equal to or larger than an electromotive force of the sensor element generated at a stoichiometric air-to-fuel ratio.

An air-fuel ratio control system for an internal combustion engine is provided. This system has an upstream air-fuel ratio sensor arranged upstream of a catalytic converter and a downstream air-fuel ratio sensor arranged downstream thereof, and learns a given feedback control parameter upon reversal of an air-fuel ratio between rich and lean sides based on the downstream air-fuel ratio sensor. The system also learns the given feedback control parameter when preselected conditions are met even if the air-fuel ratio is not reversed. Additionally, the system, when brought under open-loop control from feedback control, stores the given control parameter. Upon resumption of the feedback control, when the air-fuel ratio shows the same status, the stored given control parameter is used. Further, the system controls the air-fuel ratio based on the output from the downstream air-fuel ratio sensor when it moves out of a preselected range.

Air-fuel ratio control apparatus for internal combustion engines

An internal combustion engine control device is constructed to estimate an engine air intake quantity based on an engine speed when the engine is running in an intake air pulsation generating range to control the engine in accordance with the air intake quantity thus estimated. The estimated air intake quantity is corrected by a correction value which is related to the density of the intake air.

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Kariya, Japan

Kenichi Ono