Honda Motor Co., Ltd.

Yuki Takano

Toshifumi Osawa

Masaki Cho

Tsuyoshi Takizawa

Nobuyuki Kishi

Takanori Osuka

Tetsuya Kaneko

Tomiyuki Sasaki

Tomoyuki Takewaka

Osamu Nishioka

Takahiro Kitamura

Kazuya Tajiri

Hiroyuki Natsui

Ryosuke Ibata

Shunji Akamatsu

Shinji Fujita

Shinya Nakano

Satoko Sakiyama

Kenta Onishi

Katsunori Murakami

A diagnosis apparatus of a fuel supply system includes an operation state detector, an air-fuel ratio sensor, a fuel injection amount calculator, a threshold value table, an abnormality information acquiring device, and an abnormality determining device. In the threshold value table, operation ranges of an internal combustion engine are provided based on an engine speed and a throttle opening. In the threshold value table, a lean side threshold value and a rich side threshold value of an air-fuel ratio correction factor to determine abnormality of the fuel supply system are set beforehand for each of the operation ranges. The abnormality information acquiring device is configured to determine whether the air-fuel ratio correction factor has exceeded the lean side threshold value or the rich side threshold value extracted from the threshold value table according to an operation state so as to acquire abnormality information.

Diagnosis device for fuel supply system

An internal combustion engine for being mounted laterally on a saddle-type vehicle includes an AC generator disposed on an end portion of a crankshaft which is supported in a crankcase. An ACG cover covers the AC generator from outside widthwise across the vehicle. The ACG cover includes an electric power transmission line cover bulging portion covering electric power transmission lines extending to the ACG cover and bulging sideways outwardly widthwise across the vehicle. A crank angle sensor is disposed behind the electric power transmission line cover bulging portion in a vehicle front-back direction. The crank angle sensor is thus protected from flying stones, etc. without an increase in the number of parts used and an increase in the weight of the internal combustion engine.

Internal combustion engine

An exhaust emission purification control device for an engine that accurately estimates an accumulated oxygen amount of a catalyst at a terminating time of a reduction treatment which includes a secondary air injector that injects secondary air within an exhaust path, a sensor which detects an air-fuel ratio in a downstream side of a catylyst, a count-value accumulator which estimates an accumulated oxygen amount (a count value) in the catalyst during the secondary air injection, and a rich spike controller which performs rich injection after the secondary air injection. The device includes a count-value corrector that multiplies the count value after the secondary air injection by a correction coefficient derived from an output value SVOof the Osensor during termination of reduction treatment, so as to estimate the accumulated oxygen amount during the termination of the reduction treatment.

Exhaust emission purification control device for engine

Growing community of inventors

Wako, Japan

Yuki Takano