Internal combustion engine

Details Internal combustion engine Internal combustion engine

2000-06-21

2001-11-06

Lo, Weilun (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

C123S090150, C123S306000, C123S308000, C123S432000

Reexamination Certificate

active

06311653

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to improvements in an internal combustion engine, and more particularly to improvements in an internal combustion engine of the type wherein intake valves are electromagnetically operated.
Hitherto an internal combustion engine of the type wherein an engine valve is operated to make its opening and closing action twice in one engine cycle has been disclosed in Japanese Patent Provisional Publication No. 5-157008. The engine is provided with a storage chamber communicable with a combustion chamber or engine cylinder. The engine valve or storage chamber valve is movably disposed between the storage chamber and the combustion chamber. The storage chamber valve makes its first opening and closing action in expansion stroke thereby temporarily storing combustion or burnt gas into the storage chamber. Thereafter, the storage chamber valve makes its second opening and closing action in compression stroke thereby returning or recirculating cooled burnt gas back into the combustion chamber.
SUMMARY OF THE INVENTION
However, the above conventional engine requires a port for the storage chamber and the storage chamber valve in addition to intake and exhaust ports and intake and exhaust valves. Further, the storage chamber valve requires a valve operating mechanism therefore. This complicates the structure of the engine, making the engine large-sized and complicating the shape of the combustion chamber.
In general, on a combustion chamber wall, the area for intake and exhaust valves (ports) is limited. Accordingly, in case of providing the port for the storage chamber, the area for the intake and exhaust valves (ports) is reduced upon addition of the storage chamber valve.
Furthermore, in the above conventional engine, operation of the intake and exhaust valves and the storage chamber valve is not electromagnetically controlled, and therefore the opening and closing action of the storage chamber valve cannot be made twice in one stroke of the engine cycle thereby making it impossible to appropriately control intake air. Consequently, it is required to provide other systems such as an intake air control system which is adapted to change the length and volume of an intake manifold, for example, in accordance with load conditions of the engine. This will unavoidably make the engine and peripheral devices large-sized.
It is an object of the present invention to provide an improved internal combustion engine which can effectively overcome drawbacks encountered in conventional internal combustion engines of the similar natures.
Another object of the present invention is provide an improved internal combustion engine which can largely improve a volumetric efficiency of the engine without making the engine complicated and large-sized.
An internal combustion engine of the present invention comprises an intake valve. An electromagnetic actuator is provided for actuating the intake valve so that the intake valve makes its opening and closing action. A control unit is provided for controlling the electromagnetic actuator in accordance with engine operating conditions. The control unit is arranged to control the electromagnetic actuator in a manner to cause the intake valve to make first and second opening and closing actions in an intake stroke in synchronism with intake air pulsation. The first opening and closing action is before in time the second opening and closing action.


REFERENCES:
patent: 4829947 (1989-05-01), Lequesne
patent: 5216987 (1993-06-01), Clarke
patent: 5494007 (1996-02-01), Schroeder et al.
patent: 5669341 (1997-09-01), Ushirono et al.
patent: 6182621 (2001-02-01), Salber et al.
patent: 197 33 139 (1999-02-01), None
patent: 0 854 280 (1998-07-01), None
patent: 5-157008 (1993-06-01), None

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