Denso Corporation

Nippondenso Co., Ltd.

Jun Ozeki

Masakazu Ninomiya

Junya Morikawa

Toshiaki Kikuchi

Kazunori Kishita

A throttle opening range is divided into regions corresponding to the opening positions, and a deviation between an actual intake air suction state and a predetermined suction state provided for each of the divided regions is calculated. Intake system abnormality such as air cleaner clogging or intake pipe leakage is determined, if the deviation changes in a predetermined increasing or decreasing direction over a plurality of the divided regions. The air suction state may be represented by an intake pipe pressure or intake air flow quantity.

Intake system failure detecting device and method for engines

An apparatus for controlling a quantity of fuel injected into an internal combustion engine comprises a sensor for detecting atomspheric pressure, a sensor for detecting a load condition of an internal combustion engine, and an electronic control device including a microprocessor. The CPU functions to perform the processing steps including: step of setting a reference fuel injection quantity in accordance with a load condition of the engine, step of detecting a transient condition of the engine, step of setting a transient correction value in accordance with the transient condition of the engine, step of correcting the transient correction value to be decreased as the atmospheric pressure decreases, and step of setting a quantity of injection fuel supplied to the engine in accordance with the set value of the reference fuel injection quantity and the corrected transient correction value, whereby a deviation of an air fuel ratio from an appropriate value can be prevented even under a transient condition where atmospheric pressure varies.

Growing community of inventors

Nagoya, Japan

Jun Ozeki