Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
  • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
  • B60T8/3655—Continuously controlled electromagnetic valves
  • B60T8/366—Valve details
  • B60T8/367—Seat valves, e.g. poppet valves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
  • B60T15/02—Application and release valves
  • B60T15/025—Electrically controlled valves
  • B60T15/028—Electrically controlled valves in hydraulic systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
  • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
  • B60T8/3655—Continuously controlled electromagnetic valves
  • B60T8/366—Valve details
  • B60T8/3665—Sliding valves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/44—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
  • B60T8/441—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters

Definitions

• Hydraulic brake system that can be operated with external power
• the invention relates to a hydraulic brake system for motor vehicles which can be actuated by external power and which has a master brake cylinder which is preceded by a hydraulic brake booster which has an intensifier piston and a working chamber to which an auxiliary pressure source can be connected, a valve device which can be actuated by means of an electromagnetic drive being provided in a first switching position a hydraulic connection between the working chamber and a pressure-free pressure medium reservoir and in a second switching position a connection between the working chamber and the auxiliary pressure source.
• Such a brake system is such. B. known from DE 32 41 662 C2.
• the valve device of the known brake system preferably consists of a normally open and a normally closed solenoid valve, which are designed as digitally controllable valves, which are controlled by a differently long maximum opening (pulse width modulation) and thus for the regulation or metering of the in the working chamber controlled hydraulic pressure are less suitable.
• the invention is therefore based on the object of improving a hydraulic brake system of the type mentioned which can be actuated by external force in such a way that a comfortable response behavior is ensured while at the same time reducing the noise produced during operation.
• valve device should be very small, on the one hand enable rapid braking and on the other hand ensure fine volume metering in the normal braking function.
• valve device is formed by an analog controllable slide valve.
• the slide valve is formed by a slide guided in a sleeve-shaped housing body, which has two control edges, of which the first control edge forms a first variable throttle cross section with a corresponding control edge on the housing body, which forms the hydraulic connection between the Controls working chamber and the unpressurized pressure medium reservoir and the second control edge with a second control edge on the housing body forms a second variable throttle cross-section that controls the hydraulic connection between the working chamber and the auxiliary pressure source.
• the slide is hollow and has a bore which enables a connection between a connection assigned to the auxiliary pressure source and a connection assigned to the working chamber.
• pressure equalization is achieved on both sides of the slide according to the invention, so that the electromagnetic drive can be dimensioned correspondingly smaller.
• the invention also creates the possibility of using one and the same multi-way valve for different vehicle classes.
• a gap seal is provided between the connection assigned to the auxiliary pressure source and the connection assigned to the pressure medium reservoir, which is formed by the radial play between the slide and the housing body.
• a contact seal is connected in series with the gap seal, which is preferably designed as a prestressed elastomer, in particular teflon, seal.
• the separating effect of the second throttle cross section is increased according to a particularly advantageous embodiment of the invention in that the second control edge on the slide forms a seat valve with a stop designed as a sealing seat, which is connected in series with the second throttle cross section.
• the stop which preferably defines the first switching or the starting position of the slide, can be designed, for example, as a cone or ball seat or can be formed by an elastomeric ring element, for example an O-ring.
• means which enable sensing of the slide position and whose output signals can be fed to an electronic controller influencing the electromagnetic drive. It is particularly useful if the electromagnetic drive is designed as a proportional magnet.
• An increase in the operational safety of the brake system according to the invention is achieved in a very particularly advantageous manner in that a check valve which blocks the pressure medium reservoir container is integrated in the connection between the working chamber and the pressure medium reservoir container in the valve device. It also makes sense if the second control edge still overlaps the second control edge of the housing body after lifting off the sealing seat and only opens the second throttle cross-section when this second control edge is passed.
• FIG. 1 is a circuit diagram of the brake system according to the invention.
• FIG. 2 shows a valve device used in the brake system according to FIG. 1 in an axial sectional view.
• the hydraulic brake system according to the invention shown in FIG. 1 consists of a pressure transmitter which can be actuated by means of an actuating pedal 1, preferably a tandem master brake cylinder 2, which is operatively connected upstream of a hydraulic brake booster 3.
• the tandem master cylinder 2 has pressure chambers 6, 7 which are separated from one another by two pistons 4, 5 and which are connected to an unpressurized pressure medium reservoir 8.
• At the pressure chambers 6, 7 are, preferably with the interposition of an ABS modulator 9, which is only indicated schematically, wheel brakes 10, 11, 12 and 13 assigned to the vehicle wheels and pressure sensors 14, 15 are connected.
• the aforementioned hydraulic brake booster 3 essentially consists of a working chamber 18 delimited in the housing 16 of the master brake cylinder 2 by an booster piston 17, to which a hydraulic auxiliary pressure source 19 can be connected and which can be connected to the pressure medium reservoir 8.
• the connection between the working chamber 18 and the auxiliary pressure source 19 and the pressure medium reservoir 8 is preferably carried out by means of an electromagnetically actuated 3/3-way valve 20.
• the force is transmitted from the booster piston 17 to the first master cylinder piston 4 by means of a rubber-elastic reaction disk 21, which at the same time is a Transmission of the actuating force introduced at the operating pedal 1 and applied by the vehicle driver is made possible.
• the transmission of the actuating force is preferably a push rod 22 coupled to the actuating pedal 1 and guided in the booster piston 17.
• an electronic sensor device 23 is provided which detects the movement of the booster piston 17 and whose signals are fed to an electronic control unit 24, which is only indicated schematically affects both the pressure modulation in an ABS control case and for the control of the
• Auxiliary pressure source 19 provides.
• the control unit 24 is also supplied with the output signals of the previously mentioned pressure sensors 14, 15 and a third pressure sensor 25 which detects the pressure applied by the auxiliary pressure source 19.
• Reference number 26 denotes a housing block which accommodates an electromagnetic drive 27.
• the electromagnetic drive 27 comprises a coil 28, the connections 29 of which emerge on the front side 30 of the housing block 26 and an armature 32 which can be displaced in a longitudinal direction 31 of the valve.
• the armature 32 extends in the opposite direction to the front side 30 of the housing block 26 a push rod 33 which is fixedly connected to a slide 34 which has a continuous opening 35 extending in the longitudinal direction 31.
• a sleeve-shaped housing body 36 is attached in a pressure-tight manner, which accommodates the slide 34 so that it can move in the longitudinal direction 31.
• the sleeve-shaped housing body 36 has two radially extending openings 37, 38 spaced apart from one another in the longitudinal direction 31, in each of which a filter 39 or 40 is arranged.
• the radial opening 37 forms a connection for the pressure medium reservoir 8 mentioned above.
• the opening 38 forms a connection which is connected to the working chamber 18 of the hydraulic booster 3.
• the longitudinal opening 35 opens into a connection 41 to which the pressure side of the auxiliary pressure source 19 is connected.
• the sleeve-shaped housing body 36 is sealingly received in a further housing block, not shown.
• a spring 43 is provided which is supported at one end against a radially inwardly projecting step 44 and at the other end against the end face 42 of the slide 34 and into it Preloads longitudinal direction 31 on the electromagnetic drive 27.
• the slide 34 forms with its end face 45 facing the electromagnetic drive 27 and with an elastomeric ring element 46 which, forming a sealing seat, bears against the housing block 26, a seat valve 47.
• a first radial collar 51 formed on the slide 34 forms a first control edge 48 which, together with a corresponding control edge 50 of the sleeve-shaped housing body 36, forms a first variable throttle cross section 52 between the connection 38 to the working chamber 18 and the radial opening 37 to the pressure medium reservoir 8.
• the slide 34 is designed as a hollow slide, so that via its opening 35, pressure and flow communication is established between the section adjacent to the auxiliary pressure source end 42 of the slide 34 and the section adjacent to the anchor end 45 of the slide 34.
• the end face 45 of the slide 34 forms a second control edge 54 which, with a corresponding control edge 56 of the housing body 36, forms a second variable throttle cross-section 58 between the auxiliary pressure source 19 and the working chamber 18, which can be changed by moving the slide 34 and can be opened or closed.
• the valve device 20 is shown in its initial position.
• the slide 34 is in the de-energized state of the electromagnetic drive 27 under the pretension of the spring 43 in its first end position, in which the throttle cross section 52 between the working chamber 18 and the pressure medium reservoir 8 is opened to the maximum.
• control edge 54 towards the working chamber 18 has passed over the control edge 56, so that the working chamber 18 is separated from the auxiliary pressure source 19 in terms of flow.
• the seat valve 47 is also closed, that is to say the control edge 54 of the slide 34 is pressed against the elastomeric ring element 46 in a sealing manner by the spring 43.
• the electromagnetic drive 27 is energized and the armature moves against the action of the spring 43 in the longitudinal direction 31 to its second end position to the right.
• the slide 34 is moved in the same direction and the seat valve 47 is opened by lifting the control edge 54 of the slide 34 from the elastomeric ring element 46 and the control edge 54 sweeping over the control edge 56, so that a progressively increasing throttle cross section 58 between the auxiliary pressure source 19 and the working chamber 18 is opened so that a pressure build-up in the working chamber 18 of the hydraulic brake booster 3 takes place.
• a pressure maintenance phase can also be initiated.
• This is achieved in a particularly advantageous manner by a combination of pulse width and pulse amplitude modulation of the control signals for the electromagnetic drive 27, in that the armature 32 and thus the plunger 33 and slide 34 are moved back as far as the direction of the starting position relative to the pressure build-up position, not shown, described above that the control edge 54 of the slide 34 assigned to the auxiliary pressure source 19 has just reached or slightly overlaps the corresponding control edge 56.
• the control edge 48 of the slide 34 on the working chamber side is also in the region of its corresponding control edge 50.
• a gap seal which separates the auxiliary pressure source closure 41 from the container connection 37 and which is formed and determined by the radial play between the slide 34 and the housing body 36.
• a contact seal 59 in the form of a further elastomeric ring element in the axial direction is provided in the area mentioned in the multi-way valve 20 shown, which seals the gap between slide 34 and sleeve-shaped housing body 36.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Electromagnetism (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Fluid Mechanics (AREA)
• Braking Systems And Boosters (AREA)
• Regulating Braking Force (AREA)
• Valves And Accessory Devices For Braking Systems (AREA)
• Magnetically Actuated Valves (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7823537

Family Applications (1)

Country Status (9)

Families Citing this family (13)

Family Cites Families (17)

• 1997
  • 1997-03-15 DE DE19710862A patent/DE19710862A1/de not_active Withdrawn
• 1998
  • 1998-03-13 CZ CZ983666A patent/CZ366698A3/cs unknown
  • 1998-03-13 PL PL98329921A patent/PL329921A1/xx unknown
  • 1998-03-13 US US09/180,817 patent/US6213568B1/en not_active Expired - Fee Related
  • 1998-03-13 WO PCT/EP1998/001482 patent/WO1998041430A1/de not_active Application Discontinuation
  • 1998-03-13 HU HU0001553A patent/HUP0001553A3/hu unknown
  • 1998-03-13 EP EP98912477A patent/EP0917513A1/de not_active Withdrawn
  • 1998-03-13 AU AU67300/98A patent/AU6730098A/en not_active Abandoned
  • 1998-03-13 JP JP54012598A patent/JP2001504416A/ja not_active Withdrawn

Non-Patent Citations (1)

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