WO2001014189A1 - Systeme de freinage et procede permettant de faire fonctionner ledit systeme - Google Patents

Systeme de freinage et procede permettant de faire fonctionner ledit systeme Download PDF

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Publication number
WO2001014189A1
WO2001014189A1 PCT/EP2000/008192 EP0008192W WO0114189A1 WO 2001014189 A1 WO2001014189 A1 WO 2001014189A1 EP 0008192 W EP0008192 W EP 0008192W WO 0114189 A1 WO0114189 A1 WO 0114189A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
pressure
brake system
control
pressure gradient
Prior art date
Application number
PCT/EP2000/008192
Other languages
German (de)
English (en)
Inventor
Jose Gonzalez
Thorsten Neu
Original Assignee
Continental Teves Ag & Co. Ohg
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
Priority claimed from DE10004183A external-priority patent/DE10004183A1/de
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Publication of WO2001014189A1 publication Critical patent/WO2001014189A1/fr

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
    • B60T13/66—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
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • 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
    • B60T8/321—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 deceleration
    • B60T8/3255—Systems in which the braking action is dependent on brake pedal data
    • B60T8/3275—Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity
    • 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
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
    • B60T8/4881—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems having priming means
    • 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
    • B60T8/90—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 using a simulated speed signal to test speed responsive control means
    • 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
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/03—Brake assistants

Definitions

  • the invention relates to an anti-lock brake system for driving stability and / or traction control, in particular for motor vehicles, and to a method for operating such a brake system, which can be operated by the driver and / or by an external brake device, a brake pressure transmitter, a hydraulic unit connected between the brake pressure transmitter and the wheel brakes for wheel-specific brake pressure modulation on the wheel brakes and a control device for controlling the hydraulic unit and / or the third-party brake device depending on the operating and driving state variables detected by sensors.
  • Such a brake system is known for example from EP 0 770 012 B1.
  • a brake booster active booster equipped with an additional solenoid valve is described, which enables the brake pressure to be set independently of the driver by means of electrical control.
  • a so-called brake assistant BA can be implemented, which is able to recognize emergency braking situations and, if necessary, automatically by means of electrical control. to build up a maximum required braking force support.
  • An electrically controllable brake booster can not only be used for a brake assistant, but also for an electronic stability program (ESP) or Intelligent Cruise Control (ICC).
  • ESP electronic stability program
  • ICC Intelligent Cruise Control
  • the electrically controllable brake booster is used to ensure that the brake pressure builds up quickly, which is required for stabilization.
  • ICC pick-up appropriate external control of the brake booster can be used to perform a metered automatic braking to maintain a required safety distance from the person in front.
  • a brake assistant function can be activated, for example, if a determined pressure gradient exceeds a predetermined threshold value. At low temperatures (T ⁇ 10 C C), however, so high dynamic pressures can arise in the brake system that the pressure gradient during normal operation can exceed the trigger threshold for actuating the brake assistant.
  • a brake assistant can also be drawn via a displacement sensor, from the signals of which the speed of the brake pedal actuation is derived. Is by comparing the determined speed of actuation If an emergency braking situation is detected with a predefined speed threshold, the solenoid valve is activated to build up a maximum auxiliary power of the amplifier.
  • this speed threshold may be difficult to reach at low temperatures.
  • the object of the invention is to provide a brake system and em method for operating a brake system which enable the external brake device to function properly at all temperatures.
  • the invention provides that the control parameters of the external braking device are adapted as a function of the ambient temperature. This enables the functionality, the system dynamics and / or the noise behavior to be optimized.
  • the ambient temperature can therefore be deduced from the detected pressure gradient with a given electrical control of the external brake device and, for example, the triggering threshold of the third-party brake device can be adjusted accordingly.
  • the signals of a pressure sensor monitoring the master brake cylinder pressure can be used, which is included as standard in brake systems with an electronic stability program (ESP). No additional sensors are therefore required for brake systems with an ESP system.
  • ESP electronic stability program
  • the signals of a separate temperature sensor or one already provided in the vehicle could also be used to record the ambient temperature.
  • the measurement of the pressure gradient can take place during a check of the brake system, for example, after restarting the ignition, in which the electromagnet in the brake booster is controlled with a ramp-like increasing current or an increasing pulse width ratio and that to achieve a predetermined pressure (e.g. 5 bar) the required maximum current value I m a ⁇ or the maximum pulse width PWM max is determined.
  • a check is carried out, for example, in vehicles with an ESP system and booster pre-charging after each restart of the ignition.
  • the accuracy of the temperature detection can be improved in an advantageous manner by forming a product of the detected pressure gradient and the maximum current value I max or the maximum pulse width PWM max . Based this product can be concluded with a relatively high accuracy of the ambient temperature, especially in the interesting, lower temperature range.
  • a control of the external braking device that is adapted to the ambient temperature can thus be achieved without separate sensors, using the sensors that are present anyway.
  • the temperature can be adjusted, for example, by raising the pressure gradient threshold for triggering the third-party brake device at low temperatures or lowering the threshold for the speed of the brake pedal actuation to trigger a brake assistant function.
  • Such an adjustment is expediently carried out after restarting the ignition.
  • a check could also be carried out e.g. be repeated after a stop.
  • Fig. 1 is a schematic representation of a motor vehicle brake system
  • Fig. 2 em diagram for explaining a temperature detection by a test pulse when checking the brake system.
  • the motor vehicle brake system shown schematically in Fig. 1 consists essentially of a brake pressure sensor 1 which can be actuated and / or electrically controlled by the driver, a hydraulic unit 6 connected between the brake pressure sensor 1 and the wheel brakes 2, 3, 4 and 5 for a wheel-selective brake pressure modulation if required on the wheel brakes and a control device 7 for the electrical control of the hydraulic unit 6 and / or the brake pressure sensor 1 as a function of the operating and driving state variables detected by sensors.
  • the brake pressure transmitter 1 which can be actuated by the driver by means of a brake pedal 8, consists of a pneumatic brake booster 9, for example, which is followed by a master brake cylinder 10, which is preferably designed as a tandem master cylinder.
  • the pressure spaces of the master brake cylinder 10, which are not shown in detail, can be connected to a pressure medium reservoir 11.
  • the brake pedal 8 is coupled to an actuating rod 12 for actuating a control valve 13, which controls the build-up of a pneumatic differential pressure in the housing of the vacuum brake booster.
  • a brake light switch 15 that is operatively connected to the brake pedal 8 enables the driver to recognize that the brake booster 9 has been activated or that the electromagnet 14 is actuated. Adjust of the brake booster 9, the brake pedal 8 is carried along and thus the brake light switch 15 is reversed. An actuation of the brake booster 9 initiated by the driver can be detected by using a release switch 16.
  • the brake system shown in Fig. 1 has two identically constructed brake circuits I, II, so that the following description of one brake circuit also applies to the other.
  • the hydraulic unit 6 connected between the two pressure outlets of the main brake cylinder 10 and the hydraulic lines 6 leading to the wheel brakes 2, 3, 4, and 5 has an engine-pump unit which consists of a hydraulic recovery pump 17 driven by an electric motor, not shown , whose suction side is connected to one of the two pressure spaces of the master brake cylinder 10 via a first check valve 18 and an electromagnetically actuated switching valve 19. From the pressure side of the recovery pump 17, the pressure medium flows via a second check valve 20 and a steaming chamber 21 to a hydraulic node 22. Connected to this are both a line section 23 leading to the first wheel brake cylinder 2 and a line section 24 leading to the second wheel brake cylinder 3 Line 25 connects the pressure side of the recovery pump 17 to the tandem master cylinder 10.
  • a preferably electromagnetically actuated isolation valve 26 is connected between the node 22 and the master brake cylinder 10. which both a third check valve 27 and em pressure relief valve 28 are connected in parallel.
  • a parallel connection of an inlet valve 29 with a fourth check valve 30 and an outlet valve 31 are used to modulate the pressure applied in the first wheel brake cylinder 2, the aforementioned parallel connection being inserted in the line section 23 and the outlet valve 31 for the purpose of reducing the wheel brake pressure, a connection between the first wheel brake cylinder 2 and a low-pressure accumulator 32 enables, which is connected via a fifth check valve 33 to the suction side of the recovery pump 17.
  • a second parallel connection of a second inlet valve 34 with a sixth check valve 35 and a second outlet valve 36 are provided, the parallel connection mentioned in the line section 24 is inserted and the outlet valve 36 for the purpose of reducing the wheel brake pressure establishes a connection between the second wheel brake cylinder 38 and the low-pressure accumulator 32.
  • means for detecting the master brake cylinder pressures are provided in both brake circuits I, II, preferably by means of the first and second brake circuits I, II connected pressure sensors 37 and 38 are formed, the output signals together with further signals from sensors 39 to 42, which, for example, information about the
  • control parameters for the third-party brake device such as the triggering threshold for activating a brake assistant function
  • the control parameters for the third-party brake device can be adapted to the existing temperature conditions.
  • the solenoid 14 is controlled by a test pulse shown in FIG. 1 with a ramp-like current and the maximum current value I max required to achieve a predetermined pressure is detected
  • the test pulse can be used to derive the ambient temperature from the product of the pressure gradient and maximum current value I max .
  • the pressure gradient threshold for triggering external braking or the threshold for the actuation speed of the brake pedal to trigger a brake assistant function are adapted.

Landscapes

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

Abstract

Système de freinage antiblocage destiné à la régulation de la stabilité directionnelle et/ou de l'antipatinage à l'accélération, en particulier pour véhicules à moteur, et procédé permettant de faire fonctionner ledit système. Ce dernier comporte un cylindre (1) pouvant être actionné par le conducteur et/ou par un dispositif de freinage auxiliaire (14), une unité hydraulique (6) montée entre le cylindre (1) et les freins (2, 3, 4, 5) de roue pour la modulation individuelle pour chaque roue de la pression de freinage sur les freins des roues et un dispositif de commande (7) destiné à commander l'unité hydraulique (6) et/ou le dispositif de freinage auxiliaire (14) en fonction des grandeurs d'état de conduite et de fonctionnement relevées par des capteurs. Pour garantir une fonction appropriée du dispositif de freinage auxiliaire à toutes les températures, les paramètres de commande du dispositif de freinage auxiliaire (14) peuvent être adaptés en fonction de la température ambiante.
PCT/EP2000/008192 1999-08-24 2000-08-22 Systeme de freinage et procede permettant de faire fonctionner ledit systeme WO2001014189A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19939875 1999-08-24
DE19939875.5 1999-08-24
DE10004183A DE10004183A1 (de) 1999-08-24 2000-02-01 Bremsanlage und Verfahren zu deren Betrieb
DE10004183.3 2000-02-01

Publications (1)

Publication Number Publication Date
WO2001014189A1 true WO2001014189A1 (fr) 2001-03-01

Family

ID=26004130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/008192 WO2001014189A1 (fr) 1999-08-24 2000-08-22 Systeme de freinage et procede permettant de faire fonctionner ledit systeme

Country Status (1)

Country Link
WO (1) WO2001014189A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5607209A (en) * 1994-06-06 1997-03-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Braking apparatus and braking method for vehicle
DE19604126A1 (de) * 1996-02-06 1997-08-07 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung der Bremsanlage eines Fahrzeugs
EP0867350A2 (fr) * 1997-03-27 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Système de contrÔle de freinage pour véhicules
DE19744112C1 (de) * 1997-10-06 1998-10-22 Lucas Ind Plc Fahrzeugbremsanlage eines Kraftfahrzeuges
DE19725241A1 (de) * 1997-06-14 1998-12-17 Itt Mfg Enterprises Inc Verfahren zum Ansteuern einer Kraftfahrzeugbremsanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5607209A (en) * 1994-06-06 1997-03-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Braking apparatus and braking method for vehicle
DE19604126A1 (de) * 1996-02-06 1997-08-07 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung der Bremsanlage eines Fahrzeugs
EP0867350A2 (fr) * 1997-03-27 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Système de contrÔle de freinage pour véhicules
DE19725241A1 (de) * 1997-06-14 1998-12-17 Itt Mfg Enterprises Inc Verfahren zum Ansteuern einer Kraftfahrzeugbremsanlage
DE19744112C1 (de) * 1997-10-06 1998-10-22 Lucas Ind Plc Fahrzeugbremsanlage eines Kraftfahrzeuges

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