Toyota Jidosha Kabushiki Kaisha

Kazunori Kojima

Junichi Kako

Akihiro Katayama

Naohide Fuwa

Naoto Kato

Toshinari Nagai

Daisuke Kobayashi

Koichi Ueda

An air-fuel ratio control apparatus of an internal combustion engine according to the present invention is provided with oxygen storage amount estimating means, downstream exhaust air-fuel ratio detecting means, maximum oxygen storage amount estimating means, and air-fuel ratio target setting means. The oxygen storage amount estimating means estimates an oxygen storage amount of an exhaust purifying catalyst, based on a history of an oxygen adsorption/desorption amount of the exhaust purifying catalyst located on an exhaust path. The downstream exhaust air-fuel ratio detecting means is located downstream of the exhaust purifying catalyst and detects an exhaust air-fuel ratio downstream of the exhaust purifying catalyst. The maximum oxygen storage amount estimating means estimates a maximum oxygen storage amount, based on an oxygen storage amount estimate when the exhaust air-fuel ratio detected is a predetermined air-fuel ratio. This permits effective utilization of oxygen occlusion capability of the exhaust purifying catalyst and improvement in exhaust purification performance.

Air-fuel ratio control apparatus of internal combustion engine

A fuel injection amount control apparatus estimates an intake air amount for a present or coming suction stroke of a cylinder based on an estimated throttle opening, and calculates a pre-correction estimated necessary fuel amount based on the intake air amount. The apparatus also calculates an actual intake air amount based on an actual throttle opening at the end of the previous suction stroke, and calculates an actual necessary fuel amount based on the actual intake air amount. The apparatus then calculates an actual intake fuel amount based on an actual fuel injection amount for the previous suction stroke and a forward fuel behavior model, calculates a normal estimated necessary fuel amount by correcting the pre-correction necessary fuel amount according to a difference between the actual necessary fuel amount and the actual intake fuel amount, and calculates a fuel injection amount for this suction stroke, based on a reverse fuel behavior model, so as to induct fuel of the normal estimated necessary fuel amount into the cylinder.

Fuel injection amount control method and apparatus of internal combustion engine

A fuel injection amount control apparatus of an internal combustion engine is arranged to start injection of a fuel into an intake passage of the engine when a certain engine start condition is satisfied, and stop the injection of the fuel when a certain engine stop condition is satisfied. The control apparatus estimates an amount of fuel deposited on an intake passage forming member that defines the intake passage, and determines a fuel injection amount based on the estimated fuel deposition amount. The control apparatus also executes a particular process for making an actual fuel deposition amount on the intake passage forming member substantially equal to zero, after the engine stop condition is satisfied and before the injection of the fuel is started under a condition that the engine start condition is satisfied.

Fuel injection amount control apparatus and method of internal combustion engine

In a fuel injection control apparatus of an internal combustion engine for controlling a fuel supply quantities by making use of a fuel behavior model obtained by modeling the dynamic behavior of fuel flowing from injector into combustion chamber of cylinder of engine, the fuel behavior model is configured to estimate the dynamic fuel behavior such as attachment onto and detachment from a wall surface, e.g., using separate quantities, a wall surface adhesion quantity Fwv(k) of a low boiling point component and a wall surface adhesion quantity Fwp(k) of a high boiling point component at each time k, and to control an injected fuel quantity Fi(k) so that a fuel quantity Fc(k) of fuel flowing into the cylinder becomes a target value.

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Susono, Japan

Kazunori Kojima