Honda Giken Kogyo Kabushiki Kaisha

Kentaro Yokoo

Toshikazu Oketani

Hiroyuki Sugiura

Yoichi Iwata

Yoshitaka Hibino

Tetsu Teshirogi

Yoshihisa Hara

Akira Hashimoto

Akira Katoh

Naoki Iida

Masaaki Tomii

In an exhaust secondary air supply system including an electric air pump and a flow rate control valve disposed in an air supply passage connected to an exhaust passage of an engine, the electric air pump is first driven after the start of the engine, and the flow rate control valve is then opened after a lapse of a predetermined time. At a time after starting the driving of the electric air pump, the abnormality of the electric air pump is detected by comparing a deviation between the current before and after driving of the electric air pump with a predetermined reference value. After opening of the flow rate control valve, the abnormality of the flow rate control valve is detected by comparing the deviation between the current before and after the opening of the flow rate control valve with a predetermined reference value.

Abnormality detecting device for exhaust secondary air supplying system

A control system for an internal combustion engine has a catalyst arranged in the exhaust system, for purifying exhaust gases emitted from the engine. An ECU controls operation of the engine, based on at least one predetermined control parameter, and detects a temperature state of the catalyst at the start of the engine. The at least one predetermined control parameter is changed, based on the detected temperature state of the catalyst, after the start of the engine.

Control system for internal combustion engines and control system for

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Wako, Japan

Kentaro Yokoo