Internal-combustion engines – Charge forming device – Fuel flow regulation between the pump and the charge-forming...
Patent
1995-07-10
1997-12-30
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel flow regulation between the pump and the charge-forming...
123462, F02M 3704, F02M 4100
Patent
active
057018731
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a control device for a filling-ratio adjusting pump with at least one displacement space which works on the suction-throttle principle with a positive variation in volume of the displacement space or of the displacement spaces, which obtains the liquid to be conveyed from a liquid reservoir, having a free surface loaded with a gas pressure, usually atmospheric pressure, by means of a conduit or, if appropriate, via a hydraulic system, but without a supply of gas.
BACKGROUND ART
Filling-ratio adjusting pumps are hydrostatic pumps with a displacement effect by means of lifting pistons (for example, radial piston pump, axial piston pump, in-line pump) or rotary or pivoting piston pumps (for example, vane-cell pump, blocking-vane pump, roller-cell pump). The invention relates only to those filling-ratio adjusting pumps which work on the principle of suction throttling with a positive displacement movement. In these, a partial filling of the displacement space occurs as a result of a controlled cavitation in the compressed liquid. Both pistons with an oscillating movement and rotary displacers (vane-cell pump, blocking-vane pump, etc.) can be considered as positively moved displacers.
To increase the energy efficiency in hydrostatic systems, there has already long been the desire for an increased use of adjusting pumps. However, the currently obtainable designs of such adjusting pumps, which are mostly produced on the principle of stroke adjustment, are still too expensive for many uses or have too low an efficiency during part conveyance, that is to say at a low filling ratio.
At the same time, on account of the gain/cost ratio of the electronics which rises undiminished, there is a continuing trend towards the interlinking of electronics and fluid technology, so that there is a growing demand for a direct, but nevertheless cost-effective electrical control of adjusting pumps.
To be incorporated into regulating systems (in the form of actuating members), future adjusting pumps must have specific conveyed-stream characteristics and must reproduce these accurately, with low hysteresis and sufficient rapidity (that is to say, for example, without a long idle time). As is known, for actuating members in control loops, such properties are in part indispensable and in part at least of considerable advantage.
Furthermore, a high conveying uniformity of the individual displacers relative to one another is important, on the one hand on account of the noise generation and on account of any consumers relying on uniformity and, on the other hand, so that no additional disturbances of different frequency which could irritate a controller are carried into the high-pressure system.
Hydrostatic filling-ratio adjusting pumps of this type can be employed in many areas of use in vehicle, industrial, aeronautical and water hydraulics and, in particular, for general motor-vehicle hydraulics and the so-called common-rail diesel injection systems. By the use of the phase-control principle in such filling-ratio adjusting pumps (see the list of literature references at the end of the description), very high efficiencies can be achieved even during part conveyance and, in particular, even in the case of low-viscosity media, very high pressures and the lowest possible rotational speed. Particularly in contrast to this stroke-adjusting pump, in the phase-controlled pump, with a decreasing conveyed quantity per work cycle, there is also a reduction in the duration of pressure loading of the displacer bodies and the lost work associated with it (such as, for example, piston-gap leakage). This property of leakage insensitivity results, in addition to other reasons (see 2 and 4 of the list of literature references at the end of the description), in the particular suitability of such pumps for the common-rail diesel injection technique.
Such a reason is also the low consumption of energy or of force for the adjustment, since this frequently takes place via the adjustment of a throttle in the low-pr
REFERENCES:
patent: 2653543 (1953-09-01), Mott
patent: 4406264 (1983-09-01), Mowbray
patent: 4474158 (1984-10-01), Mowbray
patent: 4660523 (1987-04-01), Brauer
patent: 5094216 (1992-03-01), Miyaki
patent: 5115783 (1992-05-01), Nakamura
patent: 5197441 (1993-03-01), Green
patent: 5220894 (1993-06-01), Straubel
patent: 5479899 (1996-01-01), Phelps
Eidgenoessische Technische Hochschule Laboratorium Fuer
Miller Carl S.
LandOfFree
Control device for a filling-ratio adjusting pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control device for a filling-ratio adjusting pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control device for a filling-ratio adjusting pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-194537