Toyota Jidosha Kabushiki Kaisha

Tatsuro Shimada

Masashi Hakariya

Yoshihisa Oda

Isao Nakajima

Masanao Idogawa

Koji Ichikawa

Toshihiro Kato

Tomohiko Satomi

Yasushi Iwazaki

Hiroshi Miyamoto

Tokiji Ito

Yuya Yoshikawa

Takuya Matsumoto

Yoshifumi Matsuda

Hiroaki Tsuji

Masahide Okada

Shinichi Nakagoshi

Kiyotaka Kushihama

When the vehicle is stopped and removal of deposits is not required, and forced charging of a power storage device is not being performed, the controller controls the fuel supply device so that a supply fuel pressure is at the first fuel pressure. When the vehicle is stopped and the removal of deposits is required, and the forced charging of the power storage device is being performed, the controller controls the fuel supply device so that the supply fuel pressure is at a second fuel pressure higher than the first fuel pressure. When the vehicle is stopped and the removal of deposits is required, and the forced charging of the power storage device is not being performed, the controller controls the fuel supply device so that the supply fuel pressure is at a third fuel pressure higher than the first fuel pressure and lower than the second fuel pressure.

Hybrid electric vehicle

A hybrid electric vehicle includes an engine having an in-cylinder injection valve, a fuel supply device that supplies fuel to the in-cylinder injection valve, a motor that can generate an electric power through the use of a motive power output from the engine and can output a running motive power, and an electrical storage device that exchanges electric power with the motor. A deposit removal process where deposits adherent to the in-cylinder injection valve are removed by setting a pressure of fuel supplied to the in-cylinder injection valve to a predetermined pressure higher than a normal pressure and injecting fuel from the in-cylinder injection valve is performed during the performance of a forcible charging process for the electrical storage device, and the forcible charging process is continued until the pressure of fuel is returned to the normal pressure after the end of the deposit removal process.

A fuel injection amount control apparatus comprises an air-fuel ratio sensor disposed between an exhaust gas merging portion and an upstream catalyst. The control apparatus performs a feedback correction on an amount of fuel to be injected by the fuel injection valve so that an air-fuel ratio represented by the output value of the upstream air-fuel ratio sensor becomes equal to a target air-fuel ratio set at stoichiometric air-fuel ratio. The control apparatus obtains an air-fuel ratio imbalance indicating value, which becomes larger as a difference in air-fuel ratio of each of the mixtures supplied to each of the combustion chambers among the cylinders becomes larger, and performs an increasing correction to the instructed fuel injection amount in such a manner that an air-fuel ratio determined by the instructed fuel injection amount becomes richer than the stoichiometric air-fuel ratio as the obtained air-fuel ratio imbalance indicating value increases.

Fuel injection amount control apparatus for an internal combustion engine

An abnormality detecting device of an internal combustion engine according to the present invention includes a sensor nick abnormality detecting unit configured to detect a nick abnormality in a detecting element of a downstream side sensor which is provided in a downstream side of an exhaust gas purifying catalyst in an exhaust passage and generates an output corresponding to an oxygen concentration in exhaust gas, on the basis of a matter that a distribution of an output of the downstream side sensor is biased to an area in which the air-fuel ratio is leaner than a theoretical air-fuel ratio, and an inhibiting unit configured to inhibit detection of the nick abnormality of the detecting element by the sensor nick abnormality detecting unit in the case that an intake air amount exceeds a predetermined amount.

Abnormality detecting device of internal combustion engine

In an engine having a plurality of cylinders in which a plurality of fuel injection valves are provided respectively, fuel is injected at a predetermined injection ratio, and an abnormality of air-fuel ratio variation is detected. If a fuel injection amount of at least one of the plurality of the fuel injection valves is smaller than a predetermined reference value, the fuel injection amount is increased so as to become equal to or larger than the reference value.

Air-fuel ratio variation abnormality detecting device and air-fuel ratio variation abnormality detecting method

The invention provides an inter-cylinder air-fuel ratio imbalance abnormality detection device for a multi-cylinder internal combustion engine, in which when abnormality detection processing of detecting an inter-cylinder air-fuel ratio imbalance abnormality on the basis of revolution speed fluctuations of the multi-cylinder internal combustion engine and ignition timing control for controlling the ignition timing so as to restrict revolution speed fluctuations in the multi-cylinder internal combustion engine are implemented, the implementation of the ignition timing control is restricted when the abnormality detection processing is implemented, and an abnormality detection method to be used in such a device.

Inter-cylinder air-fuel ratio imbalance abnormality detection device for multi-cylinder internal combustion engine and abnormality detection method therefor

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Toyota, Japan

Tatsuro Shimada