Internal-combustion engines – Combustion chamber means having fuel injection only – Having a particular relationship between injection and...
Reexamination Certificate
2001-02-22
2003-07-08
Hirsch, Paul J. (Department: 3754)
Internal-combustion engines
Combustion chamber means having fuel injection only
Having a particular relationship between injection and...
C123S306000, C123S430000
Reexamination Certificate
active
06588399
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a fuel injection method of an internal combustion engine and in particularly to a fuel injection method of an internal combustion engine in which an atomization of a fuel spray injected from a fuel injector is heightened and the fuel spray is supplied to an intake manifold, and a fuel injection apparatus of an internal combustion engine and in particularly to a fuel injection apparatus of an internal combustion engine in which an atomization of a fuel spray injected from a fuel injector is heightened and the fuel spray is supplied to an intake manifold.
2. Prior Art
Recently, from an aspect of an environment protection, exhaust gas regulations and fuel consumption regulations in the automobile field have been enforced exclusively from year to year. As a result of these requirements, improvements in an exhaust gas purification and the fuel consumption of an internal combustion engine and various kinds of internal combustion engines (such as a lean burn engine and a direct injection engine etc.) have been proposed.
In the above stated direct injection engine, there is a problem from a manufacturing cost in accordance with many alternations about an engine base, and it has needed to provide a piston head which has a specific shape configuration and requires some surrounding devices. As a result, there is continued desire for an improvement of combustion in an internal combustion engine using the above stated lean burn engine.
The above stated lean burn engine is an engine in which an air-fuel mixture is performed to lean and burn by employing a fuel injection system in which a multi point injection (MPI) system for carrying out a fuel injection from a fuel injector which is provided on a respective cylinders. The fuel injection is synchronized to an intake stroke so that a lean characteristic of the air-fuel mixture is performed.
On the other hand, by gathering a rich air-fuel mixture in which a spark is enabled to carry out at a surrounding portion of an ignition plug, an improvement of the fuel consumption can be attained in the internal combustion engine and an improvement of an exhaust gas purification can be attained in the internal combustion engine. As to the techniques relating to the improvements of the lean burn engine, such techniques are shown in Japanese application patent laid-open publication Hei 8-177,689 and Japanese application patent laid-open publication Hei 11-159,424.
In the above stated prior arts, in light of the adhesion of the injection fuel to an intake port, and the cylinder etc. of the engine, this adhesion invites an aggravation of the exhaust gas purification. In other words, to dissolve a fuel wet characteristic, an atomization of particle diameters (grain diameter or grain sizes), such as 80-100 &mgr;m, of the injection fuel and further an advance arrangement structure of an injection hole portion of the fuel injector (the injection hole portion of the fuel injector is near the intake port) are carried out. The fuel consumption in the internal combustion engine and the improvement of the exhaust gas performance in the internal combustion engine are thereby attained.
In accordance with the advance arrangement structure of the injection hole portion of the fuel injector, by carrying out the atomization of the particle diameters in the above stated injection fuel, however the aggravation of the exhaust gas performance in the internal combustion engine according to the adhesion of the injection fuel to the cylinder etc. may be dissolved.
However, since the kinetic energy of the above stated atomized injection fuel is smaller than the kinetic energy of the injection fuel having the ordinary particle diameters, there is a problem of a delay in time of the injection, fuel in which a penetrating force of the fuel injection is made small and a time is delayed for the injection fuel to reach the cylinder from the fuel injection apparatus (i.e., the fuel injector). Because of the delay in time of the injection fuel, there is a problem in which all of the injection fuel can not enter in a combustion chamber of the engine during an intake stroke time. In other words, the delay in time of the injection fuel of the fuel injector to the combustion chamber of the engine is a transportation delay.
Herein, the inventors of the present invention have determined that the delay in time of the injection fuel (all of the fuel can not be entered in the combustion chamber of the engine during the intake stroke time) makes it difficult for the injection to be synchronized to the intake stroke time in the fuel injection system in which the MPI (multi-point injection) system is performed. As a result, it is necessary to reduce the delay in time of the injection fuel during the intake stroke time.
However, in the above stated prior art, only the fuel wet characteristic can be reduced. There is no particular consideration about the dissolution of the delay in time of the injection fuel during the intake stroke time or the transportation delay of the injection fuel during the intake stroke time.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a fuel injection method of an internal combustion engine and a fuel injection apparatus of an internal combustion engine. In such a fuel injection apparatus (i.e., a fuel injector) performed by a MPI (a multi-point injection) system, a quality of an air-fuel mixture in a cylinder and a formation condition of the air-fuel mixture in a cylinder can be improved.
Another object of the present invention is to provide a fuel injection method of an internal combustion engine and a fuel injection apparatus of an internal combustion engine, in a fuel injection apparatus (a fuel injector) which is performed by a MPI (a multi-point injection) system, so that an atomization degree of a fuel spray injected from a fuel injector can be more heightened (i.e., increased) and the fuel spray into an combustion chamber can be more suitably supplied.
A further object of the present invention is to provide a fuel injection method of an internal combustion engine and a fuel injection apparatus of an internal combustion engine. In such a fuel injection apparatus (a fuel injector) performed by a MPI (a multi-point injection) system, an orientation (i.e., a directionality or a directional movement) of a fuel spray to be subjected to the injection of a fuel injector can be suitably adjusted and a shape of the fuel spray can be suitably adjusted.
A further object of the present invention is to provide a fuel injection method of an internal combustion engine and a fuel injection apparatus of an internal combustion engine. In such a fuel injection apparatus (a fuel injector) performed by a MPI (a multi-point injection) system, a delay time of an injection fuel injected from a fuel injector can be lessened.
In a fuel injection apparatus of an internal combustion engine according to the present invention, basically, the fuel injection apparatus of the internal combustion engine comprises an intake valve device for opening and closing an intake port, a fuel injector driven in accordance with a control signal from an engine control device which is arranged in an upstream side of the intake valve device, and an intake air flow control device arranged near an upstream side of the fuel injector. A fuel injection is synchronized with an intake stroke of the internal combustion engine. A fuel spray injected from the fuel injector is generated to orient to an inner wall face which is an opposed side of an inner wall face of a cylinder head of a side of the fuel injection. When the intake valve device is opened, an intake air flow having a strong fluidization, which flows in from the intake air control device, transports the fuel spray.
In the fuel injection apparatus of the internal combustion engine according to the present invention, the fuel injection system in which during the intake stroke a multi-point injection (MPI) system is synchronized and an optimum fuel injectio
Kadomukai Yuzo
Miyajima Ayumu
Nagano Masami
Okamoto Yoshio
Someno Tadashi
Antonelli Terry Stout & Kraus LLP
Hirsch Paul J.
Hitachi , Ltd.
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