Toyota Jidosha Kabushiki Kaisha

Masanobu Tamura

Hiroshi Takahashi

Kunihiko Sato

In a double air-fuel ratio sensor system including two air-fuel ratio sensors, upstream and downstream of a catalyst converter provided in an exhaust gas passage, a skip amount is calculated in accordance with the output of the downstream-side air-fuel ratio sensor, and a skip operation is performed upon an air-fuel ratio correction amount FAF by the skip amount when the output of the upstream-side air-fuel ratio sensor is switched from the rich side to the lean side, or vice versa. When the skip amount is larger than a predetermined value, the skip amount is divided into a plurality of amounts, thus enabling a plurality of skip operations to be performed upon the air-fuel ratio correction amount FAF.

Double air-fuel ratio sensor system having divided-skip function

A fuel injection control system for an internal combustion engine including: a cold start injection valve provided inside an intake pipe for performing fuel injection on cold starts; a switch for controlling energization of the cold start injection valve; a starter drive state detector for judging if a starter is being driven; a clock for detecting, by the starter drive state detector, a change of the starter from a nonoperating state to an operating state and for counting time elapsed from the detected change; and start controller which designates a starting fuel injection when the elapsed time counted by the clock is a first predetermined period or more and which prohibits the starting fuel injection when the elapsed time is a second predetermined period or more greater than the first predetermined period.

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Toyota, Japan

Masanobu Tamura