Toyota Jidosha Kabushiki Kaisha

Motonari Yarino

Susumu Hashimoto

Tatsuo Kobayashi

Tomojiro Sugimoto

Naoya Kaneko

Noriyuki Takada

Atsushi Inoue

Eriko Matsumura

Daisuke Uchida

Yoshiyuki Kitazume

A combustion chamber structure in which an installation hole of the injector is improved to realize a rapid combustion and to reduce an unburned hydrocarbon. In the combustion chamber, a leading end of an injector is withdrawn from an upper end of an opening of an installation hole, and an additionally expanded surface area is formed on an upper inner surface of the installation hole from a portion to which the leading end of the injector is situated to an opening end of the installation hole. An angle between the additionally expanded surface area and a joint surface of a cylinder head is narrower than an angle between a center axis of the installation hole and the joint surface.

Combustion chamber structure for internal combustion engine

In a cylinder head according to an example of the present disclosure, a pair of intake ports communicating with the common combustion chamber are formed so that the wall thickness of the port walls on opposing sides is relatively small and the wall thickness of the port walls on reversing sides is relatively large. Herein, the opposing side is the side on which the port walls of the pair of the intake ports face each other. The reversing side is the side opposite to the opposing side. That is, the reversing side is the side on which the port walls of the pair of the intake ports face away from each other. An inter-ports flow path for flowing the cooling water is formed between the port walls on the opposing sides of the pair of the intake ports.

Cylinder head

The invention relates to a control device applied to a cylinder injection type of the engine (). The control device carries out a fuel injection while changing a penetration force of the injected fuel by changing a maximum value of a lift amount of the valve body () of the injector (). Further, the control device controls an ignition timing on the basis of the engine operation state. The control device changes an end timing of a preceding injection carried out immediately before the ignition timing such that a time period between the end timing of the preceding injection and the ignition timing under a state where a first value is set as the maximum value of the valve body lift amount in the preceding injection, is longer than a time period between the end timing of the preceding injection and the ignition timing under a state that a second value larger than the first value is set as the maximum value of the valve body lift amount in the preceding injection.

Control device for cylinder direct injection type of internal combustion engine

An engine controller according to one aspect of the invention is applied to a cylinder injection engine including a fuel injection valve that directly injects fuel into a cylinder. The engine controller determines whether knocking is occurring based on a signal from a knocking sensor. When the knocking is occurring, the engine controller performs partial lift fuel injection at a predetermined timing close to an ignition timing. The partial lift fuel injection is performed with a lift amount of a valve body of the fuel injection valve limited within a range between a minimum lift amount (0) and a partial lift amount, which is smaller than a maximum lift amount.

Engine controller

In order to achieve stable combustion in an internal combustion engine, the engine includes a fuel injection valve having a first nozzle hole and a second nozzle hole, and an spark plug disposed at a position through which the swirling flow flows, and which is at the downstream side of the flow of the swirling flow from an extension line of the first nozzle hole and at the upstream side of the flow of the swirling flow from an extension line of the second nozzle hole, for igniting a spray of fuel injected from the fuel injection valve, wherein the first nozzle hole and the second nozzle hole are formed in such a manner that the shortest distance from the extension line of the first nozzle hole to the spark plug becomes longer than the shortest distance from the extension line of the second nozzle hole to the spark plug.

Internal combustion engine

The invention relates to a control device applied to a cylinder injection type of an internal combustion engine (). The control device control a disperse parameter for changing a degree of a spread of the fuel spray injected from the injector () such that the maximum degree of the spread of the fuel spray under a state where an amount of the fuel adhering to the spark generation part () of the spark plug () at the ignition timing corresponds to a first amount, is smaller than the maximum degree of the spread of the fuel spray under a state where the amount of the fuel adhering to the spark generation part at the ignition timing corresponds to a second amount smaller than said first amount.

Control device for internal combustion engine

A fuel injection valve () is provided with a plurality of injection holes () arranged at intervals in a lateral direction, when a direction in which a central axis (CL) of the cylinder () extends is a vertical direction, so that the plurality of injection holes () are directed radially. The plurality of injection holes () are configured such that, when an angle formed between two adjacent injection axes, among a plurality of injection axes (Axf) defining the respective injection directions of the injection holes, is an included angle, the included angle (&#x3b8;1) formed by two injection axes closest to the central axis of the cylinder () is the smallest of all the included angles (&#x3b8;1, &#x3b8;2, &#x3b8;3).

Fuel injection apparatus for internal combustion engine

A fuel injection device is equipped with a fuel injection valve that is mounted in an engine body and injects fuel containing air bubbles, and void fraction adjustment means that changes a void fraction of the fuel that is to be injected from the fuel injection valve. The void ratio adjustment means increases the fuel pressure of the fuel to be injected from the fuel injection valve when an increase of the void fraction is requested. The void fraction adjustment means adjusts the void fraction of the fuel by changing temperature of the fuel to be injected from the fuel injection valve. By appropriately controlling the void fraction, both fuel atomization and securement of the net amount of fuel can be achieved.

Fuel injection device

In a fuel injection nozzle for an internal combustion engine, a first cavity is disposed downstream of a valve seat in a direction in which fuel flows. A second cavity is disposed downstream of the first cavity in the direction in which the fuel flows. A fuel passage connects the first cavity to the second cavity. Fuel injection holes () lead to the second cavity. With this configuration, when the fuel flows through the first fuel passage, cavitation is induced. Cavitation bubbles flow into the second cavity along with the fuel. When the fuel is retained in the second cavity, the cavitation bubbles are uniformly mixed into the fuel. The fuel, which has been sufficiently mixed with the cavitation bubbles, is injected from the fuel injection holes.

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Sunto-gun, Japan

Motonari Yarino