Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1990-03-30
1991-11-05
Okonsky, David A.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
123 73C, 123432, F02B 7502
Patent
active
050623958
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a two-stroke internal combustion engine.
BACKGROUND ART
In a two-stroke internal combustion engine, there is a period during which both the intake port and the exhaust port are open. Therefore, the phenomenon occurs in which the fuel supplied in the cylinders is exhausted into the exhaust port in the unburnt state, i.e., so-called "blowby" occurs. When blowby occurs, there are the problems of deterioration of the rate of fuel consumption, an increase in the emission of toxic exhaust, etc., so it is necessary to reduce such blowby. Toward this end, it is possible to provide a fuel injection valve for directly spraying fuel in the cylinder and to delay the fuel injection timing of the fuel injection valve so as to reduce the blowby.
However, in the case of direct injection of fuel into a cylinder, it is not possible to sufficiently disperse and atomize the fuel by the flow of intake air as in the case of injecting fuel into an intake port. Further, if the fuel injection timing is delayed, as the time from the injection of the fuel to the ignition becomes shorter, it is not possible to vaporize the fuel sufficiently. Therefore, there is the problem that good ignition and combustion cannot be obtained.
As a countermeasure, Japanese National Publication (Tokuhyo) No. 63-50032 discloses a two-stroke internal combustion engine which has an intake port and exhaust port on the inner peripheral side surface of the cylinder to enable direct injection of fuel in the cylinder, said two-stroke internal combustion engine injecting into the cylinder at least 80 percent of the amount of fuel injection before the closing of the exhaust port during high load engine operation so as to improve the dispersion and atomization of fuel in high load engine operation.
However, such a two-stroke internal combustion engine tries to improve the dispersion and atomization of fuel just by lengthening the time from the injection of fuel in the cylinder to its ignition, so the dispersion of the fuel and the atomization and vaporization of the fuel are still insufficient and therefore it is not possible to obtain excellent ignition and combustion.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a two-stroke internal combustion engine which enables easy ignition of the fuel and excellent combustion after ignition.
According to the present invention, there is provided a two-stroke internal combustion engine provided with a piston which moves reciprocatively in a cylinder, a cylinder head which has an inner wall surface, at least one intake valve which is arranged on the cylinder head inner wall surface, at least one exhaust valve which is arranged on the cylinder head inner wall surface, a masking means which is arranged between the intake valve and the exhaust valve and closes the opening between the peripheral edge of the intake valve and valve seat positioned at the exhaust valve side, a fuel injection means which is arranged at the peripheral side portion of the cylinder head inner wall of the intake valve side, and a control means which controls the fuel injection from the fuel injection means to the cylinder, the control means starting the fuel injection from the fuel injection means to the cylinder when the intake valve is opening.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side sectional view of a two-stroke internal combustion engine of a first embodiment of the present invention;
FIG. 2 is a view showing the inner wall surface of the cylinder head of FIG. 1;
FIG. 3 is a diagrammatic perspective view along the arrow III of FIG. 1;
FIG. 4 is a diagrammatic perspective view along the arrow IV of FIG. 1;
FIG. 5 is a graph of the opening period etc. of the intake and exhaust valves and an air blast valve;
FIG. 6 is a view of the state of fuel atomization in a combustion chamber;
FIG. 7 is a side sectional view of a two-stroke internal combustion engine of a second embodiment of the present invention;
FIG. 8 is a view showing the cylinder head inner w
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Okonsky David A.
Toyota Jidosha & Kabushiki Kaisha
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