WO2020025187A1 - Procédé de fonctionnement d'un système de freinage auxiliaire hydraulique et/ou d'un système de freinage actionné par une force extérieure - Google Patents

Procédé de fonctionnement d'un système de freinage auxiliaire hydraulique et/ou d'un système de freinage actionné par une force extérieure Download PDF

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Publication number
WO2020025187A1
WO2020025187A1 PCT/EP2019/063554 EP2019063554W WO2020025187A1 WO 2020025187 A1 WO2020025187 A1 WO 2020025187A1 EP 2019063554 W EP2019063554 W EP 2019063554W WO 2020025187 A1 WO2020025187 A1 WO 2020025187A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
master
vehicle
cylinder
brake system
Prior art date
Application number
PCT/EP2019/063554
Other languages
German (de)
English (en)
Inventor
Andreas SWACZINNA
Tim-Philipp Jesse
Peter Ziegler
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2020025187A1 publication Critical patent/WO2020025187A1/fr

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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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • 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
    • B60T13/16—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 pumps directly, i.e. without interposition of accumulators or reservoirs
    • B60T13/18—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 pumps directly, i.e. without interposition of accumulators or reservoirs with control of pump output delivery, e.g. by distributor 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
    • 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
    • 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
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • 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
    • 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
    • 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
    • B60T13/74—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 electrical assistance or drive
    • 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
    • B60T13/74—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 electrical assistance or drive
    • B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/226—Devices for monitoring or checking brake systems; Signal devices using devices being responsive to the difference between the fluid pressions in conduits of multiple braking 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
    • B60T8/40—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
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • 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
    • B60T8/88—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/92—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means automatically taking corrective action
    • 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
    • B60T2220/00—Monitoring, detecting driver behaviour; Signalling thereof; Counteracting thereof
    • B60T2220/04—Pedal travel sensor, stroke sensor; Sensing brake request
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/402—Back-up
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/403—Brake circuit failure

Definitions

  • the invention relates to a method for operating a hydraulic auxiliary and / or external vehicle brake system with the features of the preamble of claim 1.
  • International patent application WO 2012/150 120 A1 discloses a hydraulic auxiliary and external power vehicle brake system with a master brake cylinder which can be actuated by muscle power by means of a brake pedal.
  • the known vehicle brake system has a power brake pressure generator with a piston-cylinder unit, the piston of which can be displaced with an electric motor via a screw drive in the cylinder in order to generate a brake pressure.
  • Service braking is carried out as external power braking, in which brake pressure is generated with the external power brake pressure generator.
  • the master brake cylinder is hydraulically separated from the vehicle brake system by closing a separating valve.
  • the master brake cylinder serves as a setpoint generator for the brake pressure to be generated with the power brake pressure generator.
  • the brake pressure is generated as usual by muscle power with the master brake cylinder.
  • the known vehicle brake system has an electrohydraulic brake booster with a hydraulic pump which can be driven by an electric motor and which increases a master brake cylinder pressure. Disclosure of the invention
  • the method according to the invention with the features of claim 1 provides a relationship between a wheel brake pressure in at least one wheel brake and an actuating force of a master brake cylinder and / or to change an actuation path of the master brake cylinder and / or a master brake cylinder pressure in the master brake cylinder, in particular to reduce the wheel brake pressure in the at least one wheel brake in relation to the actuation force and / or the actuation path of the master brake cylinder and / or the master brake cylinder pressure.
  • a vehicle driver receives haptic feedback that something has changed in the vehicle brake system. In particular, the vehicle driver gets the feeling that the vehicle brake system brakes worse.
  • a fault in a vehicle brake system is, for example, a failure of a wheel brake or a brake circuit.
  • a functional restriction is, for example, air in the vehicle brake system, which is compensated for in the case of external power braking and is therefore not noticed by the vehicle driver. If the power brake pressure generator fails, the air becomes noticeable through an extended actuation path of the master brake cylinder due to the compressibility of brake fluid containing air.
  • the invention is intended in particular for so-called “hidden errors”, which means errors that the vehicle driver would not perceive without the method according to the invention, for example because it is compensated for by a brake booster or the external power brake pressure generator or has an effect on a further error Have braking behavior of the vehicle brake system.
  • FIG. 1 shows a diagram of a hydraulic auxiliary and external vehicle brake system to explain the method according to the invention.
  • Figure 2 shows a pedal characteristic curve
  • the hydraulic vehicle brake system shown in simplified form in FIG. 1 is an auxiliary and external vehicle brake system. It has a master brake cylinder 1 to which one or preferably several brake circuits, each with one or more hydraulic wheel brakes 2, are connected. A single-circuit master brake cylinder 1 is drawn, to which a brake circuit is connected.
  • the vehicle brake system preferably has a two-circuit master brake cylinder 1, to which two brake circuits, each with one or more wheel brakes 2, are connected. For example, the vehicle brake system has two wheel brakes 2 in each brake circuit.
  • the master brake cylinder 1 can be actuated with muscle power by means of a brake pedal 3 or a hand brake lever (not shown) and has a controllable, electromechanical brake booster 4.
  • the brake booster 4 amplifies the actuating force exerted by muscle force on the master brake cylinder 1, strictly speaking on a piston of the master brake cylinder 1.
  • the master brake cylinder 1 can be a controllable vacuum brake booster, for example, or the vehicle brake system can use an electro-hydraulic brake have power booster.
  • Auxiliary vehicle brake system means that the master brake cylinder 1 and thus the vehicle brake system can be actuated with muscular strength by an amplifying force of the brake booster.
  • An electrohydraulic brake booster instead increases a brake pressure generated with the master cylinder 1.
  • the brake booster 4 is controllable, which means that its gain can be adjusted or changed.
  • the vehicle brake system has an electronic control unit 5 which receives signals from a pedal travel sensor 6, a pedal force sensor (not shown) and / or from a pressure sensor 7 which is connected to the master brake cylinder 1.
  • the signals of the pedal travel sensor 6, the pedal force sensor and the pressure sensor 7 are dependent on one another, in principle one of the measured variables is sufficient as the input signal of the control device 5. For redundancy, another of the three variables or all three variables can be measured.
  • the vehicle brake system has an external brake pressure generator 8 with a piston-cylinder unit 9, the piston 10 of which can be displaced in a cylinder 12 by means of a screw drive (not shown) in order to generate a brake pressure in the vehicle brake system with an electric motor 11.
  • the cylinder 12 of the piston-cylinder unit 9 of the external brake pressure generator 8 can be hydraulically connected to the vehicle brake system by an external power valve 13.
  • a brake pressure is generated with the external power brake pressure generator 8 and the brake pressure (s) are applied to the wheel brake (s) 2 by opening the external power valve 13.
  • the main brake cylinder 1 is hydraulically separated from the vehicle brake system by closing a separating valve 14.
  • the master brake cylinder 1 serves as a setpoint generator for the brake pressure to be generated by the external power brake pressure generator 8, which is regulated by the control unit 5 as a function of the pedal force, the pedal travel and / or the master brake cylinder pressure.
  • a pressure sensor 15 is connected to the cylinder 12 of the external brake pressure generator 8.
  • one or more brake circuits and / or one or more re or all wheel brakes 2 have a pressure sensor for pressure control (not shown).
  • the wheel brake 2 or the wheel brakes 2 are actuated only in the event of a fault or a failure of the power brake pressure generator 8.
  • Each wheel brake 2 is assigned an inlet valve 16 and an outlet valve 17, with which slip control systems such as anti-lock protection, traction control systems, and driving dynamics or anti-skid control systems are possible in a manner known per se.
  • slip control systems such as anti-lock protection, traction control systems, and driving dynamics or anti-skid control systems are possible in a manner known per se.
  • ABS, ASR and FDR or ESP are used for these slip rules.
  • the brake pressure control takes place with the external force brake pressure generator 8 and / or the intake valves 16 and exhaust valves 17
  • valves 13, 14, 16, 17 are 2/2-way solenoid valves, but this is not essential for the invention.
  • a linear, a degressive or a progressive dependency between the wheel brake pressure in the / n wheel brake / n 2 and the pedal travel and / or the pedal force of the master brake cylinder 1 and / or the master brake cylinder pressure is possible.
  • the dependency is referred to here as the pedal characteristic and in the described embodiment is progressive as shown in curve 18 in FIG. 2, which shows the pedal travel s on the abscissa and the wheel brake pressure p on the ordinate.
  • different wheel brake pressures are possible in the wheel brakes 2, provided the vehicle brake system has a plurality of wheel brakes 2 with inlet and outlet valves 16, 17.
  • the pedal characteristic is progressive, that is, the wheel brake pressure increases disproportionately with increasing pedal travel and pedal force.
  • a linear, degressive, progressive and basically any dependency between the wheel brake pressure and the pedal travel, the pedal force and / or the master cylinder pressure is possible with the external brake pressure generator 8 and / or the controllable brake booster 4.
  • the dependency between the wheel brake pressure is on the one hand and the pedal travel, the pedal force and / or the master brake cylinder pressure on the other hand changed, in particular reduced, so that a vehicle driver has the feeling that the vehicle brake system is braking less well.
  • the vehicle driver is made aware of the fault or the functional limitation of the vehicle brake system.
  • a possible fault is air in the vehicle brake system, which makes the brake fluid compressible. If the vehicle brake system was actuated by external power with the external brake pressure generator 8, the fault would not be noticed without the inventive method, because the master brake cylinder 1 is hydraulically separated from the vehicle brake system by closing the isolating valve 14 and with the external brake pressure generator 8 despite the compressibility of the brake fluid by the Setpoint-dependent brake pressure or wheel brake pressure is generated. It is a so-called “hidden fault”, which is not perceptible to the vehicle driver or is only perceived if the vehicle brake system is actuated with the master brake cylinder 1 in the event of a malfunction or failure of the power brake pressure generator 8.
  • Such faults or functional restrictions can be detected using test methods that are carried out automatically by the electronic control unit 5 and in which one Pressure generated by the external brake pressure generator 8, the valves 13, 14, 16, 17 switched differently and pressures with the pressure sensors 7, 15 and movements of the external brake pressure generator 8 are measured. If the values deviate from the values with a fully functional vehicle brake system, this indicates a functional restriction or an error. If no deviations are measured, the vehicle brake system is considered to be fully functional and has the pedal characteristic provided for it, in the embodiment described the progressive pedal characteristic represented by curve 18 in the diagram in FIG. 2.
  • the pedal characteristic is changed as written, in the described embodiment of the invention the ratio between the wheel brake pressure and the actuation path and / or the actuation force of the master cylinder 1 and / or the master cylinder pressure is reduced.
  • a variant of the method according to the invention provides that at the same time the progression of the pedal characteristic is increased as shown in curve 19 in FIG. 2. This means that when the master brake cylinder 1 is actuated, the wheel brake pressure initially increases less and later than in the case of a fully functional vehicle brake system.
  • the curves 18, 19 intersect at a point 20 at which the wheel brake pressure, the actuation force, the actuation travel and the master cylinder pressure are the same in the event of a fault or a functional restriction of the vehicle brake system as in the case of a fully functional vehicle brake system. If the pressure increases further, the curve 19 of the pedal characteristic can continue to rise more, the same or less strongly than in the case of a fully functional vehicle brake system when the vehicle brake system is impaired or defective.
  • point 20 can be specified as required by law, for example for a vehicle deceleration of 6.43 m / s 2 with a pedal force of 500 N. At point 20, a higher full deceleration than the legally prescribed deceleration is also possible.
  • the full deceleration is a vehicle deceleration for the respective vehicle brake system and a vehicle equipped with it with the pedal force of 500 N. As written, it is higher than the legally prescribed vehicle deceleration and typically corresponds to the acceleration due to gravity of 9.81 m / s 2 ,
  • a variant of the method according to the invention provides, for example, an optical, acoustic and / or haptic warning of the vehicle driver in the event of an error or a functional restriction of the vehicle brake system, the optical warning 21 being shown in FIG. 1 with the symbol of a light source 21.
  • the pedal characteristic can be changed as shown by curve 22 in FIG. 2 in such a way that in point 23 a lower deceleration, for example a statutory deceleration, occurs for example with the pedal force of 500 N.
  • an optical and / or other warning prescribed deceleration of 2.44 m / s 2 with the pedal force of 500 N is reached.
  • a haptic warning of one or a functional restriction of the vehicle brake system in addition to the changed pedal characteristics, it is possible, for example, to reduce the power of a drive motor and / or to limit the speed of a motor vehicle.
  • comfort functions and / or automated driving functions such as cruise control and / or adaptive cruise control (preferably speed-dependent distance control to a vehicle in front, abbreviation: ACC, English: Adaptive Cruise Control). All of these warnings alert a driver that something is wrong.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

Afin d'attirer l'attention du conducteur sur un défaut ou une limitation fonctionnelle d'un système de freinage hydraulique auxiliaire et/ou actionné par une force extérieure d'un véhicule, l'invention propose de réduire la pression de freinage d'une roue en fonction d'une force de pédale ou de la course de pédale.
PCT/EP2019/063554 2018-08-01 2019-05-25 Procédé de fonctionnement d'un système de freinage auxiliaire hydraulique et/ou d'un système de freinage actionné par une force extérieure WO2020025187A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018212852.9 2018-08-01
DE102018212852.9A DE102018212852A1 (de) 2018-08-01 2018-08-01 Verfahren zum Betrieb einer hydraulischen Hilfskraft- und/oder Fremdkraft-Fahrzeugbremsanlage

Publications (1)

Publication Number Publication Date
WO2020025187A1 true WO2020025187A1 (fr) 2020-02-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/063554 WO2020025187A1 (fr) 2018-08-01 2019-05-25 Procédé de fonctionnement d'un système de freinage auxiliaire hydraulique et/ou d'un système de freinage actionné par une force extérieure

Country Status (2)

Country Link
DE (1) DE102018212852A1 (fr)
WO (1) WO2020025187A1 (fr)

Cited By (1)

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US11926304B2 (en) 2021-06-10 2024-03-12 Ford Global Technologies, Llc System and method for providing a brake fade indication

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022204509A1 (de) 2022-05-09 2023-11-09 Continental Teves Ag & Co. Ohg Verfahren zur Überprüfung einer Bremsanlage und Bremsanlage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561190A1 (fr) * 1984-03-16 1985-09-20 Bosch Gmbh Robert Procede pour signaler des perturbations dans le systeme de freinage d'un vehicule par une reaction sur la pedale de frein et servofrein hydraulique pour sa mise en oeuvre
GB2345276A (en) * 1998-12-31 2000-07-05 Lucas Ind Plc Vehicle system malfunction warning method
EP1916167A2 (fr) * 2006-10-27 2008-04-30 Hitachi, Ltd. Dispositif de contrôle de freinage
WO2012150120A1 (fr) 2011-05-05 2012-11-08 Continental Teves Ag & Co. Ohg Système de freinage pour véhicules automobiles ainsi que procédé pour faire fonctionner le système de freinage
US20170297546A1 (en) * 2015-02-27 2017-10-19 Hitachi Automotive Systems, Ltd. Brake control device
US20180105156A1 (en) * 2015-03-31 2018-04-19 Hitachi Automotive Systems, Ltd. Brake control apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561190A1 (fr) * 1984-03-16 1985-09-20 Bosch Gmbh Robert Procede pour signaler des perturbations dans le systeme de freinage d'un vehicule par une reaction sur la pedale de frein et servofrein hydraulique pour sa mise en oeuvre
GB2345276A (en) * 1998-12-31 2000-07-05 Lucas Ind Plc Vehicle system malfunction warning method
EP1916167A2 (fr) * 2006-10-27 2008-04-30 Hitachi, Ltd. Dispositif de contrôle de freinage
WO2012150120A1 (fr) 2011-05-05 2012-11-08 Continental Teves Ag & Co. Ohg Système de freinage pour véhicules automobiles ainsi que procédé pour faire fonctionner le système de freinage
US20170297546A1 (en) * 2015-02-27 2017-10-19 Hitachi Automotive Systems, Ltd. Brake control device
US20180105156A1 (en) * 2015-03-31 2018-04-19 Hitachi Automotive Systems, Ltd. Brake control apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11926304B2 (en) 2021-06-10 2024-03-12 Ford Global Technologies, Llc System and method for providing a brake fade indication

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