Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-06-26
1998-12-08
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123458, F02M 3704
Patent
active
058456228
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fluid metering device according to the preamble of claim 1.
In general, the flow rate is controlled with a single control valve whose orifice can be varied continuously. Such a control has a number of drawbacks. When there is for instance the need to control the flow rate of the valve on the basis of more than one quantity, this is only possible in an electronic manner. This entails the drawback that the control characteristic of the valve in respect of one quantity should generally be different from the control characteristic in respect of another quantity. For example, one quantity may require a very fine, rapid control, whereas, by contrast, the other quantity on the basis of which control takes place requires a slow control characteristic, whereby great variations in flow rate are realized.
The control characteristic of the valve is not only determined by the shape of the valve port, but also by the energizing means by means of which the valve is adjusted. Also in respect of the energizing means, with the known fluid metering devices a compromise should in each case be reached between the requirements set by the different quantities on the basis of which the flow rate is controlled. For instance, energizing means that have to be able to realize a small adjustment in a rapid manner will, constructionally, differ completely from energizing means that have to be able to realize a great adjustment at a low speed.
The realization of different control characteristics for different quantities is not possible with a normal control valve, as a consequence of which, for controlling the flow rate in conventional systems, fluid pressure control by means of, for instance, a pressure regulator is resorted to. However, such a fluid pressure control for a flow control on the basis of a first quantity disturbs the flow control by means of the valve on the basis of a second quantity.
The object of the invention is to provide a fluid metering device without the aforementioned drawbacks. Hence, a fluid metering device having different control characteristics.
To this end, the fluid metering device of the type mentioned in the preamble is characterized by the characterizing features of claim 1.
Because of the presence of two separate regulating plungers, each being controlled by energizing means of its own, the control characteristics can be properly adapted to the quantity on the basis of which the position of the regulating plunger is controlled. That is to say, the shape and dimensions of the outlet ports can be adapted to the desired control behavior and for the choice of the energizing means, the desired control behavior for the relevant quantity can be taken into account as well. On the other hand, it is also possible to control the position of the two regulating plungers on the basis of only one quantity measured, with one regulating plunger serving for the coarse adjustment and the other regulating plunger realizing the fine adjustment.
In a further elaboration of the invention, which is in particular suitable when the fluid metering device is not only intended for controlling the flow rate output, but also serves to distribute a single flow stream over a number of different flow streams, the fluid metering device is characterized by the features of claim 2.
A fluid metering device of such design can be of a compact construction and can be manufactured in an economical manner.
Further elaborations of the invention are described in subclaims and will be specified hereinafter with reference to the accompanying drawing, wherein:
FIG. 1 shows a section taken on line I--I in FIG. 2; and
FIG. 2 shows a section taken on line II--II in FIG. 1.
The fluid metering device shown in the drawing is intended to form a part of a fuel supply system of an internal combustion engine provided with combustion chambers, such as for instance cylinders. The exemplary embodiment shown in intended for the fuel supply system of a combustion engine having seven or fewer cylinders and comprises one supply line connec
REFERENCES:
patent: 4184465 (1980-01-01), Nakazeki
patent: 4459952 (1984-07-01), Holstein
patent: 4469070 (1984-09-01), Rassey
patent: 4492191 (1985-01-01), Aoki
patent: 4604981 (1986-08-01), Dazzi
patent: 4615322 (1986-10-01), Dazzi
patent: 4664084 (1987-05-01), Wheelock
patent: 5341785 (1994-08-01), Meaney
patent: 5479899 (1996-01-01), Phelps
LandOfFree
Fluid metering device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid metering device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid metering device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-168501