Patent Number: 8,495,910

Title: Air-fuel ratio estimating/detecting device

Abstract: An air-fuel ratio estimating device can include an amount of fuel injected calculating unit which can estimate the amount of fuel injected GF for each cycle on the basis of a driving time Tout of a fuel injection valve. A proportional constant calculating section determines a proportional constant K, using the estimated charging efficiency CE and the amount of fuel injected Gf, when the output value of a sensor is in a transition region R. When the sensor output value is not in the transition region R, an air-fuel ratio A/F is estimated from the determined proportional constant K, a charging efficiency CE calculated by a calculating section, and the amount of fuel injected Gf.

Inventors: Nishida; Kenji (Wako, JP), Kaneko; Tetsuya (Wako, JP), Sasaki; Tomiyuki (Wako, JP), Wagatsuma; Shinichi (Wako, JP), Honma; Satoshi (Wako, JP), Sakamoto; Naoki (Wako, JP)

Assignee: Honda Motor Co., Ltd.

International Classification: G01M 15/10 (20060101)

Expiration Date: 2021-07-30 0:00:00