EP1750984A1 - Procede pour freiner un vehicule au moyen d'une installation de freinage a commande fluidique, et installation de freinage - Google Patents

Procede pour freiner un vehicule au moyen d'une installation de freinage a commande fluidique, et installation de freinage

Info

Publication number
EP1750984A1
EP1750984A1 EP05754196A EP05754196A EP1750984A1 EP 1750984 A1 EP1750984 A1 EP 1750984A1 EP 05754196 A EP05754196 A EP 05754196A EP 05754196 A EP05754196 A EP 05754196A EP 1750984 A1 EP1750984 A1 EP 1750984A1
Authority
EP
European Patent Office
Prior art keywords
brake
fluid
vehicle
force generator
units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05754196A
Other languages
German (de)
English (en)
Inventor
Josef Knechtges
Frank Heller
Jan Grundmann
Christian Chemnitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Active Safety GmbH
Original Assignee
Lucas Automotive GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucas Automotive GmbH filed Critical Lucas Automotive GmbH
Publication of EP1750984A1 publication Critical patent/EP1750984A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B60T13/142—Systems with master cylinder
    • B60T13/147—In combination with distributor valve
    • 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
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • 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
    • B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • 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
    • B60T8/48—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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4845—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems using a booster or a master cylinder for traction control
    • B60T8/4854—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems using a booster or a master cylinder for traction control pneumatic boosters

Definitions

  • the present invention relates to a method for braking a vehicle by means of a fluidically controllable vehicle brake system and a corresponding vehicle brake system, the vehicle brake system each having a fluidically controllable brake unit assigned to a vehicle wheel, which is fluidically coupled to a brake force generator via at least one fluid circuit, in which at least one Fluid circuit, a pump device for conveying brake fluid is provided, by means of which at least one of the brake units can be supplied with brake fluid regardless of an activation of the brake force generator, and wherein control valves are provided in the fluid circuit, by means of which the brake force generator can be fluidly coupled to the brake units and the pump device and can be decoupled from them.
  • Document DE 101 10 658 C1 shows a hydraulic vehicle brake system in which two separate fluid circuits can be supplied with brake fluid via a master brake cylinder. Two brake units are assigned to each fluid circuit, a brake unit of a front wheel and a brake unit of a rear wheel. Control valves are provided to control the respective brake units. In addition, a pump device is assigned to both fluid circuits, by means of which the brake units can be controlled independently of pressure generation via the master brake cylinder. This makes it possible to implement electronic control systems, such as an electronic stability program (ESP).
  • ESP electronic stability program
  • a fluid pressure which can be detected by means of a fluid sensor, is built up in the at least one fluid circuit via the braking force generator, so that a braking effect is achieved on the at least two braking units, i.e. these are tightened.
  • the fluidic connection between the braking force generator and the rest of the respective fluid circuit is then interrupted, so that activation of the pump device and resulting pressure fluctuations or vibrations in the fluid circuit cannot spread into the braking force generator.
  • Only after the control valves have been closed is the pump device activated and subsequently brake fluid is conveyed via the pump device from one brake unit of the fluid circuit to the other brake unit of the fluid circuit.
  • the method according to the invention thus ensures that the action of the pump device neither leads to disturbing noises in the vehicle interior nor to an unusual relenting of the brake pedal.
  • a "braking force generator” is intended to mean both an arrangement in which a fluid pressure in the at least one fluid circuit is generated via a brake pedal, a brake booster and a master brake cylinder connected to it will also include an arrangement in which a brake pedal actuation is detected and in accordance with the latter then a fluid pressure is generated in the at least one fluid circuit without directly utilizing the pedal actuation force exerted on the brake pedal.
  • the expression “brake force generator” is also intended to include such arrangements, who use the pedal actuation force exerted on the brake pedal only partially or only in certain (emergency) operating situations.
  • a further development of the present invention provides that the pump device is controlled in accordance with certain parameters, for example the vehicle inclination and / and the vehicle weight or / and the wheel speed or / and the operating position of a parking brake switch and / or the brake pedal actuation or / and the yaw rate or / and the lateral acceleration or / and the fluid pressure generated by the braking force generator.
  • a parking brake switch and / or the brake pedal actuation or / and the yaw rate or / and the lateral acceleration or / and the fluid pressure generated by the braking force generator With regard to activation of the parking brake function, it is thus possible to prevent it until the speed output by each of the wheel sensors has dropped to a specific limit value or even to zero.
  • a further development of the invention provides that at least one fluid reservoir is assigned to each of the fluid circuits.
  • the fluid reservoir can thus in each case be filled with brake fluid in states in which a sufficiently high fluid pressure is available, this brake fluid then being able to be removed again if necessary.
  • the brake fluid which may be pressurized, to be temporarily stored in the fluid reservoir and for the pump device to deliver it to the other brake unit in step C).
  • the driver may feel that the pedal actuation force exerted on the brake pedal and the resulting fluid pressure in the at least a fluid circuit is not sufficient to safely park the vehicle. For example, the vehicle continues to roll at low speed despite the brake pedal being depressed. In this state, the driver will continue to depress the brake pedal in order to build up a higher fluid pressure in the at least one fluid circuit and ultimately increase the braking force.
  • a further development of the invention provides that when the fluid pressure is increased by the braking force generator during step B), the control valves are activated in such a way that further braking fluid from the braking force generator is temporarily stored in the fluid reservoir and then the braking force generator from the brake units and the pump device by closing the control valves is decoupled.
  • the fluid pressure additionally generated in the braking force generator can also be used to activate the parking brake function.
  • control valves are activated according to a pulse method, for example a pulse width modulation method.
  • a pulse width modulation method the opening or closing pulse width of the respective control valve can be varied within a period of time. This makes it possible to close the respective control valve with a holding force which corresponds to the fluid pressure at the start of the activation of the parking brake function.
  • the pump device it can be provided according to the invention that it is designed as a return pump in the fluid circuit, in particular as part of an electronic control system, for example an electronic stability system and / and an anti-lock system and / and a traction control system and / and an automatic speed control system ,
  • a pump device which is already present in the brake system can therefore be used to implement the invention.
  • An advantageous embodiment of the invention provides that two fluid circuits are provided, each fluid circuit being fluidly coupled to a brake unit assigned to a front wheel and to a brake unit assigned to a rear wheel. Furthermore, it can be provided that the vehicle wheels respectively assigned to a fluid circuit are arranged diagonally on the vehicle. In this connection, it can further be provided according to the invention that brake fluid is conveyed from the front wheel to the rear wheel in step C).
  • the invention further relates to a vehicle brake system, each having a fluidically controllable brake unit assigned to a vehicle wheel, which is fluidically coupled to a braking force generator via at least one fluid circuit, a pump device for conveying brake fluid being provided in the at least one fluid circuit, by means of which, independently of an activation of the Brake force generator at least one of the brake units can be supplied with brake fluid, and wherein control valves are provided in the fluid circuit, by means of which the brake force generator can be fluidically coupled to and decoupled from the brake units and the pump device.
  • the braking force generator builds up a fluid pressure in the at least one fluid circuit in order to fluidly control at least two of the braking units, that the control valves can also be controlled such that the braking force generator is fluidly decoupled from the braking units and the pump device and that after the fluidic decoupling of the braking force generator, the pump device conveys brake fluid from one of the at least two braking units to the other of the at least two braking units.
  • the vehicle brake system has sensors for determining the vehicle inclination and / and the vehicle weight or / and the wheel speed or / and an operating position of a parking brake switch or / and the current deflection of a brake pedal or / and the lateral acceleration of the vehicle or / and Yaw rate of the vehicle and / or the fluid pressure generated by the braking force generator.
  • the vehicle brake system according to the invention is preferably designed such that at least one fluid reservoir is assigned to each of the fluid circuits.
  • Fig. 1 is a schematic representation of a vehicle brake system according to the invention.
  • Fig. 2 is a flow chart to explain the method according to the invention.
  • FIG. 1 An embodiment of a vehicle brake system according to the invention is generally designated 10 in FIG. 1.
  • This comprises a first fluid circuit 12 and a second fluid circuit 14.
  • the two fluid circuits 12 and 14 are fluidly coupled to a tandem master brake cylinder 16, the fluid circuit 12 being supplied with brake fluid by displacing a secondary piston 18 from a secondary pressure chamber 20, and the fluid circuit 14 by moving a primary piston 22 is fed with brake fluid from a primary pressure chamber 24.
  • the master brake cylinder 16 is coupled in a conventional manner to a vacuum brake booster 26 which can be actuated via a brake pedal, not shown.
  • the fluid circuits 12 and 14 are fluidly connected to brake units 28, 30, 32, 34, the brake unit 28 being assigned to the left rear wheel, the brake unit 30 to the right front wheel, the brake unit 32 to the left front wheel and the brake unit 34 to the right rear wheel of the vehicle , This assignment is a so-called diagonal division.
  • other divisions can also be present, for example a front-axle-rear-axle division.
  • Each brake unit 28, 30, 32, 34 is assigned an inlet valve 36, 38, 40, 42, which can be controlled separately via an electronic control unit (not shown). Furthermore, each brake unit 28, 30, 32, 34 is assigned an outlet valve 44, 46, 48, 50, which can also be controlled separately via the electronic control unit. Both fluid circuits 12 and 14 are fluidly coupled to a pump device 52. An ABS or ESP functionality can be implemented, for example, via the inlet valves 36, 38, 40, 42, the outlet valves 44, 46, 48, 50 and the pump device 52. The inlet valves 36, 38, 40, 42 are actuated using a PWM (pulse width modulation) method. This results in a high degree of variability in the control of these control valves.
  • PWM pulse width modulation
  • Each of the fluid circuits 12 and 14 is also provided with a fluid reservoir 54 and 56, in which brake fluid can be temporarily stored under pressure, if necessary.
  • each of the fluid circuits 12 and 14 is associated with a pair of control valves 58 and 60 and 62 and 64.
  • the control valves 58, 60, 62 and 64 can also be controlled separately via the electronic control unit using a PWM (pulse width modulation) method, so that a high degree of variability can be achieved in the control of these control valves.
  • the control valves 58, 60, 62 and 64 are arranged in the two fluid circuits 12 and 14 as follows: the control valves 58 and 60 are assigned to the fluid circuit 12 and thus to the brake units 28 and 30; the control valves 62 and 64 are assigned to the fluid circuit 14 and thus to the brake units 32 and 34.
  • This arrangement makes it possible to fluidly decouple the individual brake units 28, 30, 32 and 34 from the master brake cylinder 16, so that an activation of the pump device 52 and a resulting circulation of brake fluid in the individual fluid circuits 12 and 14 has no effect on the master brake cylinder 16.
  • FIG. 1 also shows that a pressure sensor 66 is arranged in the fluid circuit 14. 1 also shows a series of check valves and two pressure relief valves 68 and 70, one of which is assigned to the fluid circuit 12 and the other to the fluid circuit 14. These pressure relief valves 68 and 70 serve as overload protection.
  • overload protection function can also be implemented integrally on control valves which are already present instead of by means of the additional pressure limiting valves 68 and 70 by mechanical and / or electronic measures.
  • DE 101 10 658 Cl The operation of the vehicle brake system 10 during service braking, i.e. when braking the vehicle while driving, is described in detail in the aforementioned DE 101 10 658 Cl and is therefore not explained again in detail here.
  • the content of DE 101 10 658 Cl is to be included in this disclosure by reference to it.
  • step S1 the system is started in step S1, for example by the driver pressing the brake pedal in accordance with step S2 and pressing a parking brake button in the vehicle interior in accordance with step S3.
  • a fluid pressure is built up in the fluid circuits 12 and 14 via the brake force generator comprising the master brake cylinder 16 and the brake booster 26.
  • This fluid pressure is detected by means of the pressure sensor 66 in the fluid circuit 14 and by means of a corresponding pressure sensor, not shown, in the fluid circuit 12, as indicated in step S4, and stored in an electronic control unit, not shown.
  • step S5 it is then checked whether all starting conditions are fulfilled, for example whether the brake pedal has been actuated by the driver, whether the car is at a standstill or / and whether the shift lever of a vehicle equipped with an automatic transmission is in the “parking” position. If the starting conditions are met, control parameters are subsequently loaded in step S6 from the electronic control unit (not shown in FIG. 1), such as the current inclination of the vehicle, the total vehicle weight, the speed at the individual wheels, the current deflection of the brake pedal, the lateral acceleration of the vehicle, the yaw rate or the like. These control parameters are recorded by further sensors, not shown in FIG. 1. On the basis of this information, parameters for controlling the control valves 60 and 62 are calculated, for example the pulse width of a pulse width modulation method with which the control valves 60 and 62 are controlled. In step S7, the
  • Control valves 60 and 62 are closed using the calculated pulse width in accordance with the pulse width modulation method. Control valves 58 and 64 are also closed.
  • the pump device 52 is then activated in accordance with step S8. With the activation of the pump device 52, the inlet valves 38 and 40 of the brake units 30 and 32 assigned to the front wheels are closed in step S9 with the aid of the pulse-width modulation method with a holding force which corresponds to the fluid pressure at the start of the activation of the parking brake function.
  • step S10 it is monitored whether the driver further increases the fluid pressure in the fluid circuits 12 and 14 by pressing the brake pedal harder or again.
  • Such an increase in pressure would take place, for example, if the driver wanted to park the vehicle on an inclined road by depressing the brake pedal to a certain extent and noting that the vehicle had not yet come to a complete standstill despite the brake pedal already being depressed. In such a situation, the driver will depress the brake pedal more, so that the vehicle stops safely on the inclined road.
  • step S10 If it is recognized in step S10 that the fluid pressure is further increased by the driver, then an additional amount of brake fluid is delivered from the master brake cylinder 16 into the brake units 28, 30, 32 and 34 and then into the fluid reservoirs 54 and 56, the pulse width of the Inlet valves 38 and 40 of the brake units 30 and 32 assigned to the front wheels are adapted to the current fluid pressure.
  • step S10 If no further pressure increase is detected in step S10, the system proceeds to the next step S11. In this step, the exhaust valves 46 and 48 of the brake units 30 and 32 assigned to the front wheels opened and brake fluid drained into the fluid reservoirs 54 and 64.
  • step S12 taking into account the other control parameters loaded in step S6, the electronic control unit calculates whether the brake fluid volume stored in the fluid stores 54 and 56 is sufficient to build up a sufficiently high fluid pressure in the brake units 28 and 34 so that a reliable parking brake effect is ensured ,
  • the inlet valves 36 and 42 of the brake units 28 and 34 assigned to the rear wheels are opened and the inlet valves 36 and 42 of the brake units 30 and 32 assigned to the front wheels are closed. Furthermore, the outlet valves 44 and 50 of the brake units 28 and 34 assigned to the rear wheels are closed and the outlet valves 46 and 48 of the brake units 30 and 32 assigned to the front wheels are opened to discharge brake fluid into the fluid reservoirs 54 and 56.
  • the pump device 52 delivers brake fluid from the ones assigned to the front wheels in step S13 Brake units 30 and 32 to the brake units 28 and 34 assigned to the rear wheels, so that a fluid pressure builds up in the latter, which leads to a sufficient tightening of the brake units 28 and 34.
  • step S14 the system checks whether the brake fluid diverted from the brake units 30 and 32 of the front axle into the brake units 28 and 34 of the rear axle is sufficient to achieve a reliable parking brake effect. If it turns out that this is not the case, the system jumps back to step S8 and further brake fluid is delivered from the master brake cylinder 16 into the fluid reservoirs 54 and 56. If, on the other hand, step S14 shows that the brake fluid volume stored in the fluid stores 54 and 56 is sufficient to activate a reliable parking brake function, the brake units 28 and 34 are blocked in step S15 in a customary manner, for example by respectively blocking a mechanical parking brake arrangement. The parking brake function is now activated so that the vehicle is safely parked in step S16.
  • the brake pedal only has to be depressed sufficiently again or it can be one of the preceding ones described methods for activating the parking brake function analog algorithm can be started. In both cases, the mechanical parking brake arrangement of the brake units 28 and 34 is released. The vehicle brake system is then again in a state in which normal service braking can be carried out.
  • the invention described above makes it possible to utilize a fluidically actuated vehicle brake system to activate a parking brake function, the activation of the pump device required for this in the interior of the vehicle not leading to disruptive noises and also not being felt by the driver through an unusual relenting of the brake pedal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)

Abstract

L'invention concerne un procédé pour freiner un véhicule au moyen d'une installation de freinage de véhicule à commande fluidique (10). Selon l'invention, cette installation de freinage de véhicule (10) comprend une unité de freinage à commande fluidique (28, 30, 32, 34) associée à chaque roue de véhicule, ces unités de freinage étant couplées de manière fluidique à un générateur de force de freinage (16, 26) par l'intermédiaire d'au moins un circuit fluidique (12, 14). Un dispositif de pompage (52) servant à alimenter au moins une des unités de freinage (28, 30, 32, 34) en fluide de freinage indépendamment de l'activation du générateur de force de freinage (16, 26) est prévu dans le(s) circuit(s) fluidique(s) (12, 14) pour transporter le fluide de freinage. Des soupapes de commande (58, 60, 62, 64) sont prévues dans le circuit fluidique (12, 14) pour coupler et découpler de manière fluidique le générateur de force de freinage (16, 26) avec les unités de freinage (28, 30, 32, 34) et le dispositif de pompage (52). Pour induire de manière confortable un état de freinage de stationnement, le procédé comprend les étapes qui consistent : A) à établir une pression fluidique dans le(s) circuit(s) fluidique(s) (12, 14) par l'intermédiaire du générateur de force de freinage (16, 26), de manière qu'au moins deux des unités de freinage (28, 30, 32, 34) soient commandées de manière fluidique ; B) à découpler le générateur de force de freinage (16, 26) des unités de freinage (28, 30, 32, 34) et du dispositif de pompage (52), par fermeture des soupapes de commande (58, 60, 62, 64) ; C) à activer le dispositif de pompage (dans deux unités de freinage) et à transporter le fluide de freinage, d'une des deux unités de freinage (30, 32) vers l'autre des deux unités de freinage (28, 34).
EP05754196A 2004-05-24 2005-05-19 Procede pour freiner un vehicule au moyen d'une installation de freinage a commande fluidique, et installation de freinage Withdrawn EP1750984A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004025402A DE102004025402B4 (de) 2004-05-24 2004-05-24 Verfahren zum Bremsen eines Fahrzeugs mittels einer fluidisch ansteuerbaren Fahrzeugbremsanlage und Fahrzeugbremsanlage
PCT/EP2005/005455 WO2005115816A1 (fr) 2004-05-24 2005-05-19 Procede pour freiner un vehicule au moyen d'une installation de freinage a commande fluidique, et installation de freinage

Publications (1)

Publication Number Publication Date
EP1750984A1 true EP1750984A1 (fr) 2007-02-14

Family

ID=34970881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05754196A Withdrawn EP1750984A1 (fr) 2004-05-24 2005-05-19 Procede pour freiner un vehicule au moyen d'une installation de freinage a commande fluidique, et installation de freinage

Country Status (7)

Country Link
US (1) US7654619B2 (fr)
EP (1) EP1750984A1 (fr)
JP (1) JP2008500217A (fr)
KR (1) KR20070026526A (fr)
CN (1) CN100475620C (fr)
DE (1) DE102004025402B4 (fr)
WO (1) WO2005115816A1 (fr)

Families Citing this family (12)

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DE102005059937A1 (de) * 2004-12-21 2006-07-13 Continental Teves Ag & Co. Ohg Verfahren zum Betrieb einer hydraulischen Bremsanlage für Kraftfahrzeuge
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US20080061624A1 (en) 2008-03-13
WO2005115816A1 (fr) 2005-12-08
US7654619B2 (en) 2010-02-02
CN100475620C (zh) 2009-04-08
CN1956869A (zh) 2007-05-02
KR20070026526A (ko) 2007-03-08
DE102004025402B4 (de) 2006-05-11
DE102004025402A1 (de) 2005-12-22

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