Aisan Kogyo Kabushiki Kaisha

Kensuke Hiroi

Mamoru Yoshioka

Makoto Fukui

Shinji Kawai

Kasumi Mishima

Tsutomu Kuniyoshi

Hirokazu Tashita

A blow-by gas returning (BGV) apparatus includes a blow-by gas storage unit, a throttle device placed in an intake passage, a BGV passage for allowing blow-by gas to flow to the intake passage downstream of the throttle device for recirculation, and a PCV valve for regulating a flow rate of blow-by gas. An abnormality diagnosis device includes an air flow meter to detect an intake amount in the intake passage upstream of the throttle device and an electronic control unit (ECU) for diagnosis. The ECU controls the PCV valve to a first opening degree and a second opening degree when an engine is during deceleration fuel cut, and diagnoses abnormality of the BGV apparatus based on a first intake amount detected under control with the first opening degree and a second intake amount detected under control with the second opening degree.

Growing community of inventors

Nagoya, Japan

Kensuke Hiroi