Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-10-21
1999-07-27
Poon, Peter M.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031132, 303DIG11, B60T 840
Patent
active
059278285
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic automotive vehicle brake system with brake slip control and automatic brake management for example for traction control or driving dynamics control.
German patent No. 42 32 311 discloses a hydraulic automotive vehicle brake system with an anti-lock device which, for improvement of the vehicle tracking behavior, includes automatic brake management for driving dynamics control. Special arrangements are required both for driving dynamics control and for traction slip control to provide sufficiently quickly the pressure fluid necessary for brake management by way of a pump. The brake system disclosed in the prior art document includes a separate auxiliary pressure supply means upstream of, i.e. on the suction side of, the pump circuit of the brake system. The auxiliary pressure supply means is an auxiliary pressure pump with a precharging piston for supplying and making available a sufficient amount of pressure fluid for each pump circuit, and a plurality of valves. This arrangement involves relatively extensive effort and structure.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a hydraulic automotive vehicle brake system with brake slip control and automatic brake management so that a quick response of the pump, responsible for the supply of the wheel brakes, is achieved with relatively little expenditure by the provision of an unrestricted, sufficient amount of pressure fluid.
According to the present invention, this object is achieved in that the pressure fluid accumulator is partly charged for automatic brake management. This requires a possibility of closing the pressure fluid connection between the pressure fluid accumulator and the suction side of the pump. To terminate the partial charging operation, excessive pressure fluid volume can be withdrawn from the pressure fluid accumulator. This arrangement prevents premature exhaustion of the capacity of the pressure fluid accumulator.
Further details of the present invention are described in the following by way of several embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 is a view of the principle circuit scheme and construction of a first embodiment of the present invention.
FIG. 2 is an alternative design of the valve assembly shown in FIG. 1.
FIG. 3 is a favorable design of the non-return valve disclosed in FIGS. 1 and 2, along with further features relevant to the present invention.
FIG. 4 is a view of an embodiment of a pressure fluid accumulator including the necessary circuit arrangement.
FIG. 5 is a view of functional and constructive features for the operation of the multi-way valves in conjunction with the complete circuitry design.
DETAILED DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the principal circuitry design for the operation of a wheel brake 12 which is appropriate for traction control and driving dynamics control by way of brake slip control and automatic brake management. A main pressure line 13 leading to the wheel brake 12 is connected to the braking pressure generator 9. Arranged in line 13 is an electromagnetically operable separating valve 14, in parallel thereto a pressure-limiting valve 15 and a non-return valve 16 closing in the direction of the braking pressure generator. Further, pressure modulation valves 17, 17' are interposed between the separating valve 14 and the wheel brake 12. The pressure modulation valve 17 is an inlet valve which is open in its electromagnetically deenergized, initial position. Pressure modulation valve 17', in its initial position, electromagnetically closes the pressure fluid connection between the wheel brake 12 and a pressure fluid accumulator 5. The pressure fluid accumulator 5 generally includes a charging piston 10 which, for being sealed in the housing, has a sleeve seal 18 and an annular seal 19 at its periphery. In the illustration shown, the charging piston 10 adopts a position which corresponds to a partial charge of the pressure fluid accumulator 5.
REFERENCES:
patent: 5152586 (1992-10-01), Burgdorf
patent: 5290098 (1994-03-01), Burgdorf et al.
patent: 5411326 (1995-05-01), Linhoff
ITT Manufacturing Enterprises Inc.
Poon Peter M.
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