Valves and valve actuation – Electrically actuated valve – Including solenoid
Utility Patent
1998-11-20
2001-01-02
Rivell, John (Department: 3753)
Valves and valve actuation
Electrically actuated valve
Including solenoid
C251S129180, C137S271000, C239S585100
Utility Patent
active
06168136
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a gas valve which is to be arranged in the intake port of a combustion engine according to the preamble of claim
1
.
BACKGROUND OF THE INVENTION
WO 94/15092 describes the general layout for a gas injector for an internal combustion engine.
The introduction of a gaseous medium into an internal combustion engine requires very accurate metering while, on the other hand, the valve which is used for this purpose needs to be as sturdy as possible. Attempts are being made to achieve sequential injection of fuel. On the one hand, this ensures still more accurate metering of the fuel to each individual cylinder and, on the other hand, there is no longer a risk of fire back particularly during injection of gas.
Fire back occurs in particular if, during starting, the intake port is completely filled with a combustible mixture, an intake valve is opened and, during starting, the sparking plug associated with the intake valve in question sparks. This can result in considerable damage to the intake port or air filter. By means of sequential injection as close as possible to the intake valves, the amount of fuel which is present in the intake manifold can be considerably reduced, as a result of which the effects of fire back are eliminated or, at any rate, limited.
By introducing the fuel as close as possible to the intake valves, the combustion engine will react particularly quickly to movements of the accelerator pedal.
However, the use of sequential injection requires a separate valve for each cylinder, which valve is able to inject the entire quantity of gas which is required for one operating cycle within the time for which the intake valve in question is open.
The maximum metering accuracy is achieved if the injection time required for each engine is equal to or shorter than the opening time of the intake valve.
SUMMARY OF THE INVENTION
This means, on the one hand, that the metering accuracy of each valve needs to be particularly high, while, on the otherhand, the cost price has to be as low as possible, in order to make sequential injection possible in an economically viable manner.
As a result, it should be possible to adapt a valve of this kind in a simple manner to different combustion engines.
The objects described above are achieved with a gas valve as described above having the characterising features of claim
1
.
The invention is based on the insight that the valve lift of the valve, which is to a large extent the defining parameter for the amount of gas flowing through, can be made adjustable in a simple manner by enclosing the valve body between two parallel plates which define the valve lift of the valve body. The distance between these two parallel plates is fixed by an adjusting ring.
If the valve has to be adapted to a different combustion engine, the adjusting ring can simply be made thicker or thinner.
The valve lift is of great importance, since the time for injecting gas is relatively short and the amount of gas which has to flow through is relatively large.
In a typical example, the valve is in an at least partially open position for 25% of the time.
A typical valve lift of the valve body is 0.25 mm.
In accordance with an advantageous embodiment of the invention, the gas is injected via an annular duct through a series of radial intake openings arranged in the circumference of the adjusting ring.
The actuating part is preferably of electrical form and comprises an actuating rod which is arranged in a translational manner with respect to the valve housing and, at the end remote from the valve body, is provided with a ferromagnetic member which is arranged so as to interact with a coil, and return means being arranged on the actuating element.
The problems which may possibly arise in guiding the valve body/actuating rod with respect to the remaining parts of the housing can be solved by arranging a diaphragm at that location. By providing the actuating rod with a further diaphragm, these diaphragms can be used to provide guidance. That means that it is not necessary to provide a sliding-contact bearing. This is particularly important in order to avoid the lubrication problems which arise when using vaporous LPG or gaseous LNG.
The actuating coil described above may be designed in any manner known from the prior art, but preferably it comprises a ferromagnetic core around which a winding is arranged, which core comprises a free end face, the actuating member comprising a cylindrical part provided with an end face designed to interact with the end face of the core.
Preferably, the return means comprise a spring which acts on the ferromagnetic member. This spring serves to take up considerable loads. Accelerations of 3000-4000 m/s
2
are not unusual. It should be pointed out that the actuating rod described above also has damping and resilient properties.
REFERENCES:
patent: 4365747 (1982-12-01), Knapp et al.
patent: 4662567 (1987-05-01), Knapp
patent: 4917351 (1990-04-01), Lindbloom et al.
patent: 5374029 (1994-12-01), Bailey
patent: 0 581 391 (1994-02-01), None
patent: WO 94/15092 (1994-07-01), None
Den Hartog Marcus Johannes Petrus Gerardus
Jaasma Servatius Alfons Maria
Rivell John
Vialle Beheer B.V.
Young & Thompson
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