Toyota Jidosha Kabushiki Kaisha

Fujitsu Ten Limited

Kaoru Otsuka

Takayoshi Kawai

Shinji Sadakane

Noriyasu Adachi

Keisuke Sasaki

Shigehiro Sugihira

Hiroyuki Sugihara

Naoto Kato

Koji Miwa

Shinichi Soejima

Takeru Yoshida

Takayuki Demura

Hiroyuki Tanaka

Isao Chinzei

Kazuya Suzuki

Yasuhiro Oi

Takahiro Tsukagoshi

Kiyonori Takahashi

Koichi Kitaura

Kenji Inoshita

Ryutaro Moriguchi

Yoshito Aibara

Junya Nishimura

A vehicle includes an internal combustion engine including an exhaust passage, a catalyst provided in the exhaust passage, and an electronic control unit. When the engine stop condition is established, the electronic control unit stops fuel injection and increases a catalyst inflow oxygen amount that is an amount of oxygen flowing into the catalyst by a specified oxygen increase amount. The engine stop condition is a condition for stopping operation of the internal combustion engine. The specified oxygen increase amount is larger than an increased part of the catalyst inflow oxygen amount that is increased by the stop of the fuel injection.

Vehicle and control method for vehicle

An electronic control unit of a control device for an internal combustion engine executes, for a first cycle, first drive processing for controlling an actuator such that a pin drive operation is executed for switching from a first cam to a second cam, executes second drive processing for controlling the actuator such that the pin drive operation is executed again for a second cycle, and executes abnormality determination processing for determining that a cam switching mechanism has an abnormality in a case where a pin returns to a reference position by using a pin return section following a cam switching section of the first cycle after the execution of the first drive processing and the pin returns to the reference position by using the pin return section following the cam switching section of the second cycle after the execution of the second drive processing.

Control device for internal combustion engine

In a system that selects a large-cam as a driving cam at a time of a start of an engine, when an engine stop request is output, it is determined whether there is a small-cam cylinder for which a small-cam is selected as the driving cam. In a case where it is determined that there is a small-cam cylinder, a switching command for switching the driving cam from the small-cam to the large-cam is output. When an engine start request is output, the above determination is performed again. In a case where it is determined that there is a small-cam cylinder, the switching command is output to all solenoid actuators again. In addition, the drive of the fuel injector is suspended until the switching operation of the driving cam is completed for all cylinders.

Internal combustion engine system

At crank angle CAat which the switch request of the drive cam was issued, the ejection operations of the pins at all the solenoid actuators started simultaneously. The ejected pins are seated on the cam carriers at crank angle CA. The pin seated on the cam carrier moves along the grooves in accordance with the rotation of the cam carrier. The earliest finish timing of the switch operation of the drive cam is at crank angle CA(#4 cylinder). At the crank angle CA, drive of the fuel injector and the ignition device in each cylinder is permitted.

In starting the engine, if it is determined that large cams are not completely prepared for all driving cams, valve closing timings of all intake valves are changed by driving the VVT so that all of the cylinders have equal in-cylinder filling efficiency. A fuel injection amount of each cylinder is determined by a feedforward control assuming that the large cams are completely prepared for all of the driving cams. When the valve closing timing of all of the intake valves are changed by driving the VVT to equalize the in-cylinder filling efficiencies of all of the cylinders, all of the cylinders have substantially equal in-cylinder air-fuel ratios.

A control device for an internal combustion engine is provided. The control device includes means which controls fuel injection by a fuel injection device, and means which controls the throttle. The fuel injection control means sequentially restarts fuel injection for each cylinder in accordance with an ignition sequence among cylinders when cancellation conditions of fuel cut are satisfied during implementation of the fuel cut. Meanwhile, the throttle control means firstly controls the throttle to a closing side when the cancellation conditions of fuel cut are satisfied. The throttle is controlled to the closing side, whereby the air amount in the intake pipe is decreased, and the air amount in a cylinder which is the basis of calculation of a fuel injection amount is also decreased.

There is provided an air supply apparatus for an engine comprising a plurality of exhaust pipes and catalysts arranged in the exhaust pipes, respectively, the apparatus comprising devices for supplying air into the interior of the corresponding exhaust pipes upstream of the corresponding catalysts, respectively.

Air supply apparatus

An air-fuel ratio control system for a multi-cylinder internal combustion engine is equipped with an exhaust emission control catalyst disposed in an exhaust passage of the engine, air-fuel ratio control means for controlling an air-fuel ratio of at least one of the plurality of cylinders, and an exhaust gas temperature sensor operating as catalyst temperature detection. During a cold start of the engine, the air-fuel ratio control means achieves one of rich-state and stoichiometric operation in all of the cylinders until the temperature of the exhaust emission control catalyst reaches a predetermined temperature. After the temperature of the exhaust emission control catalyst has reached the predetermined temperature, the air-fuel ratio control means starts lean-state operation in a first portion of the plurality of cylinders while maintaining rich-state operation in a second portion of the plurality of cylinders.

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Mishima, Japan

Kaoru Otsuka