Denso Corporation

Masahiro Yokoi

Jun Hasegawa

Yoshihito Suzuki

Yusaku Suzuki

Hiroaki Fujii

Tomoaki Nakano

Hiroshi Katsurahara

Kaoru Oda

Osamu Fukasawa

Tsutomu Furuhashi

Atsushi Koike

Taro Tabata

Kota Noguchi

A fuel injection valve is for injecting fuel to cause combustion in an internal combustion engine. An injection rate adjuster is for adjusting an injection rate of the fuel injected by the fuel injection valve. A control device for the internal combustion engine includes a signal generator, and an outputter. The signal generator generates a command signal to cause the injection rate adjuster to adjust the injection rate based on a parameter, which is to estimate an internal EGR amount in which a part of exhaust gas remains in a cylinder. The outputter outputs the command signal to the injection rate adjuster.

Control device for internal combustion engine

An engine () is a cylinder injection engine, and includes an injector () that directly injects a fuel into a combustion chamber (), and an ignition plug () that generates an ignition spark in the combustion chamber (). An ECU () performs multiple first injections to each produce an air-fuel mixture of a lean air-fuel ratio in the combustion chamber () before an ignition in one combustion cycle of the engine, and performs a second injection to produce an air-fuel mixture of a rich air-fuel ratio in the combustion chamber () before the ignition and after the first injection. In particular, the ECU implements the multiple first injections in such a manner that the first injection implemented early among the multiple first injections produces an air-fuel mixture leaner than that of the first injection implemented subsequently. The ECU implements the second injection only once immediately before an ignition timing.

Direct injection engine controlling device

A fuel injection control device for an engine executes a split injection constructed by a fixed injection and a variable injection. A required injection amount of the fixed injection is set in a low range. A required injection amount of the variable injection is set in a high range. An injection amount in the high range is larger than that of the low range. The required injection amount of the variable injection is changed within the high range while the required injection amount of the fixed injection is fixed when a load of the engine is varied while the split injection is performed. An injection control characteristic is corrected based on an actual air-fuel ratio detected before the load is varied and an actual air-fuel ratio detected after the load is varied.

Fuel injection control device for engine

A movable portion is movable from a closed position, in which the movable portion is in contact with a valve element, to an opened position so as to supply fuel from a fuel portion to a compression chamber through a fuel passage. A drive control unit supplies of a small driving current, which is sufficient to maintain the movable portion at the closed position, to a coil portion so as to move the movable portion from the opened position to the closed position. The drive control unit switches the supply of the small driving current to supply of the large driving current in the course of the movement of the movable portion to the closed position by supplying the small driving current.

Fuel supply apparatus

A fuel supply apparatus includes a movable unit, a coil, a drive circuit portion, and a drive control portion. The drive circuit portion energizes the coil with a drive electric current of a first value such that the movable unit is displaced from an opening-side position to a closing-side position. The drive circuit portion energizes the coil with the drive electric current of a second value that is smaller than the first value such that the movable unit is held at the closing-side position. The drive control portion controls the drive circuit portion to change the drive electric current from the first value to the second value while the movable unit is being displaced toward the closing-side position based on energization of the coil with the drive electric current of the first value.

During cylinder cut-off in which fuel injection for some cylinder(s) is halted, a variable valve operation mechanism or the halted cylinder is controlled based on an operating state of the engine whereby engine vibration is reduced during cylinder cut-off operation. The variable valve operation mechanism may be controlled based on a maximum internal pressure of a combustion cylinder in which fuel injection is continued during the cylinder cut-off operation.

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Kariya, Japan

Masahiro Yokoi