WO2022148509A1 - Système de freinage à frein à commande électrique d'un véhicule, utilisation et véhicule équipé d'un système de freinage à frein à commande électrique - Google Patents

Système de freinage à frein à commande électrique d'un véhicule, utilisation et véhicule équipé d'un système de freinage à frein à commande électrique Download PDF

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Publication number
WO2022148509A1
WO2022148509A1 PCT/DE2021/100972 DE2021100972W WO2022148509A1 WO 2022148509 A1 WO2022148509 A1 WO 2022148509A1 DE 2021100972 W DE2021100972 W DE 2021100972W WO 2022148509 A1 WO2022148509 A1 WO 2022148509A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
vehicle
braking system
wire braking
unit
Prior art date
Application number
PCT/DE2021/100972
Other languages
German (de)
English (en)
Inventor
Daniel Faber
Jan-Erik Moseberg
Kevin Gaschbauer
Alexander Hausmann
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to CN202180089792.2A priority Critical patent/CN116685510A/zh
Publication of WO2022148509A1 publication Critical patent/WO2022148509A1/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
    • 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
    • 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

Definitions

  • Vehicle brake-by-wire braking system use and vehicle having a brake-by-wire braking system
  • the present invention relates to a brake-by-wire braking system of a vehicle, the use of a brake-by-wire braking system in a vehicle and a vehicle with such a brake-by-wire braking system.
  • a by-wire brake system or a parking brake system for a motor vehicle is known in the prior art, in which a driver's braking request is detected by sensors by actuating a brake pedal.
  • the brake is no longer controlled directly via hydraulics, but via electrical impulses and microprocessor-controlled motors.
  • Sensors are arranged on the brake pedal, with which the driver's braking request is recognized by force and/or displacement measurements. Electrical lines transmit the braking request to a control unit.
  • a parking brake system is a braking system which builds up a holding force without a permanent supply of energy, through which a vehicle is prevented from rolling away. Such systems must be able to hold a vehicle securely in position, even when the vehicle is parked on a slope.
  • the systems known from the prior art either use self-locking gears, through which the brake system is actuated (EPB brake caliper) or use a locking system to lock the brake (conventional parking brake lever). generate braking force and only when the vehicle is to drive by pneumatic pressure to push back these springs.
  • a brake-by-wire brake system with hydraulic fail-safe behavior is known from EP 1 818235 B1.
  • the control is done here by means of two mechanical locks.
  • GB 2443921 A discloses a motor vehicle brake system which includes an emergency brake cylinder, an electrically controllable pressure supply device and an electronic control unit. If the by-wire function is not operational due to a possible failure of the electrically controllable pressure supply device, the brake system switches to a fallback mode in which a conventional direct hydraulic coupling of the chambers of a tandem master brake cylinder to the wheel brakes is restored. This means that a vehicle equipped with such a "by-wire" brake system can be braked with actuating energy provided by the driver by actuating a brake pedal even if the pressure supply device fails, an electronic unit fails and an electrical energy supply fails.
  • a brake-by-wire brake system of a vehicle having at least one hydraulically actuated brake unit, which is assigned to one wheel of the vehicle, at least one Flaupt brake cylinder, which is connected to the respective brake unit by means of hydraulic lines, at least one motor, which has at least one gearbox controls the at least one master brake cylinder, wherein at least one locking mechanism is provided between the motor and the master brake cylinder, wherein this locking mechanism has at least one spring element and a mechanical locking unit.
  • the brake-by-wire brake system comprises a hydraulically actuated te brake unit, which is assigned to one wheel, preferably four wheels are seen here, and at least one master brake cylinder.
  • the Bremsein unit is hydraulically at least indirectly connected to the master cylinder of the braking device.
  • Two wheels form a vehicle axis, preferably in front of a front axle and a rear axle is provided, each driving vehicle axis can be assigned a master brake cylinder, as well as other regulations are conceivable.
  • the entire braking system is controlled by at least one motor.
  • two stationary disc rotor motors are provided, but it is also conceivable to use other electric motors for this application.
  • the brake-by-wire braking system is implemented by so-called redundant engine operation, in which a locking mechanism is provided between the engine and the at least one master brake cylinder.
  • This locking mechanism has at least one spring element and a mechanical locking unit.
  • the advantage of the braking system according to the invention is that a fail-safe braking system is provided. In certain braking and/or parking situations, for example as soon as a vehicle is to be parked on a slope, the hydraulic system of the brake system can suffer from a so-called leak, which can lead to a loss of braking torque at the wheels. Due to the fact that the spring element acts as a kind of energy store and interacts with the mechanical locking unit, it is possible to maintain the hydraulic pressure and thus the brake pressure.
  • the locking mechanism is connected to the at least one gear for activation by means of a connecting element the.
  • the motor it is possible for the motor to activate the locking mechanism, i.e. the spring and the mechanical locking unit, via the gearbox.
  • the gearbox When controlling it is necessary to activate both elements of the locking mechanism, as it must be ensured that the required braking pressure can be maintained. In this way, a reliable and safe braking system can be guaranteed.
  • the spring element is preferably connected to the at least two master brake cylinders by means of a lever element.
  • a master brake cylinder is provided for each vehicle axle, which engages in each case on the lever element.
  • a particular advantage is the use of a balance beam as a lever element, which distributes the activation forces to the master brake cylinders through its leverage ratio. In this way, the master brake cylinder of the braking device can be actuated and a deceleration of the vehicle can be implemented.
  • the mechanical locking unit has a blocking link and a blocking element guided in it.
  • the at least one gear is preferably a transmission gear and/or a linear gear. Both types of transmission are preferably provided.
  • the transmission designed as a step-up transmission connects to a second transmission, namely a linear transmission.
  • Rack and pinion gears, ball screw drives, planetary roller screw drives or the like are conceivable as linear gears.
  • the at least one hydraulically actuated te brake unit is designed as a hydraulic friction brake.
  • FIG. 1 Further aspects of the invention relate to the use of a brake-by-wire braking system according to the invention in a vehicle and a vehicle with at least two parallel spaced wheels, and a brake ke-by-wire braking system according to the invention.
  • FIG. 1 shows a schematic representation of a brake-by-wire brake system according to the invention
  • FIG. 2 shows a schematic representation of a locking link of a mechanical locking unit of the brake-by-wire brake system according to the invention
  • FIG. 3 shows a schematic representation of a locking bolt of the mechanical locking unit of the brake-by-wire brake system according to the invention
  • Fig. 6a-b shows a schematic representation of the mechanical locking unit in a third position
  • FIG. 7 shows a schematic representation of the brake-by-wire brake system according to the invention in a first braking state position
  • 8 shows a schematic representation of the brake-by-wire brake system according to the invention in a second braking state position
  • FIG. 9 shows a schematic representation of the brake-by-wire brake system according to the invention in a third braking state position
  • FIG. 10 shows a schematic representation of the brake-by-wire brake system according to the invention in the event of a fault.
  • the brake system 1 shows a schematic representation of a brake-by-wire brake system 1 according to the invention.
  • the brake system 1 has two stationary motors 2, which are designed as disc rotor motors.
  • the two motors 2 are connected to two gears 3, 4 in this exemplary embodiment.
  • the gear 3 is designed as a reduction gear 5 and the motors 2 are connected to this.
  • the gear 3 connects to the other gear 4 , which is a linear gear 6 .
  • this gear 4 has a pinion 7 and a rack 8 .
  • the linear gear is a locking mechanism 9 in connection, which at least one spring element 10, which is designed as a compression spring, and a me chanical locking unit 11 has.
  • a connecting element 12 is provided, which activates the spring element 10 and the mechanical locking unit 11 by linear displacement of the toothed rack 8 .
  • a detailed description of the mechanical locking unit 11 is given in the following figures.
  • the spring element 10 interacts with a lever element 13 .
  • This lever element 13 is designed as a balance beam 14, which distributes the activation forces to two identical master brake cylinders 15 by a lever ratio.
  • the balance ken 14 is linearly guided and movable.
  • the brake master cylinders 15 are installed in a stationary manner as part of a chassis and are in a parallel alignment with each other.
  • Each brake master cylinder 15 controls a brake unit 16, 17 of an axle.
  • the front axle and rear axle are understood here as axles.
  • This actuation of the brake units 16, 17 takes place via hydraulic lines 18, 19 which are connected to the respective brake units 16, 17.
  • the brake units 16, 17 are designed as hydraulic friction brakes, such hydraulic friction brakes being able to be implemented, for example, by a drum or disc brake.
  • a friction brake or brake unit is provided for each wheel 20 .
  • FIG. 2 and FIG. 3 show the main components of the mechanical locking unit 13.
  • This locking unit has the task of maintaining the hydraulic pressure in the system without additional expenditure of energy.
  • this system consists of a movable blocking link 21 and a stationary blocking element 22, which is guided through the blocking link 21.
  • FIG. 2 shows a schematic representation of a locking link 21
  • FIG. 3 shows a schematic representation of a locking element 22, which is designed as a locking pin. The blocking element is fixed in place and is self-locking in every position.
  • FIG. 4 shows the mechanical locking unit 11 in a first position.
  • the pressure in the system is equal to 0 bar and the blocking element 22 is in its starting position.
  • FIG. 5 shows the blocking element 22 in its spear position/storage position, ie the hydraulic pressure is maintained here without any additional expenditure of energy.
  • the spring element 10 which is supported on the one hand on the incompressible, pressurized master brake cylinders 15 and on the other hand on the connecting element 12, attempts to press back the toothed rack 8.
  • the two figures 6a and 6b show the position of the mechanical locking unit 11 at maximum hydraulic pressure in the brake system 1.
  • Figures 7 to 9 show the brake-by-wire braking system 1 in different braking status positions.
  • Figure 7 shows the system in an open state, i.e. the mechanical locking unit 11 is in the position described in Figure 4, the lever element 13 is in a vertical position.
  • Figure 8 shows the system in a parking lock condition, i.e. the mechanical locking unit 11 is in the position described in Figure 5.
  • the pinion moves by a distance S1 in the axial direction, whereby the toothed rod is shifted in the direction of the connecting element 12 and consequently the Fe derelement 10 acts on the lever element 13 .
  • This is shifted from its horizontal position and moves by a distance S2 towards the horizontal.
  • Figure 9 shows the system in a full braking position, i.e. the mechanical locking unit 11 is in the position described in Figure 6b.
  • the pinion moves by a further distance S1 in the axial direction, as a result of which the toothed rack is shifted further in the direction of the connecting element 12 and consequently the spring element 10 acts on the lever element 13 .
  • This is moved further by a distance S2 in the horizontal direction.
  • FIG. 10 shows brake-by-wire brake system 1 in the event of an error.
  • the hydraulic fail-safe parking brake is shown as soon as there is a fault, such as a leak in a brake circuit.
  • the spring element 10 pushes the piston 24 of the master brake cylinder 15 down. This matches with an idle travel 25 of the piston 24.
  • a drop rate 26 of 0.05 ml/s which is known from the literature, it can still take a certain amount of time (approx. 10 h +) the vehicle must be held.
  • the hydraulic pressure in the still active brake circuit can now be maintained by means of the spring element and the linearly displaceable lever element 13 . It is thus possible to park the vehicle safely on a slope despite a leak in a brake circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Regulating Braking Force (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

La présente invention concerne un système de freinage à frein à commande électrique d'un véhicule, comprenant au moins une unité de frein à commande hydraulique (16, 17), qui est associée à une roue (20) du véhicule dans chaque cas, au moins un maître-cylindre de frein (15), qui est raccordé à l'unité de frein respective (16, 17) au moyen de conduites hydrauliques (19, 18), au moins un moteur (2), qui actionne ledit au moins un maître-cylindre de frein (15) par l'intermédiaire d'au moins une transmission (3, 4), un mécanisme de blocage (9) étant prévu entre le moteur (2) et le ou les maîtres-cylindres de frein (15), ledit mécanisme de blocage (9) comportant au moins un élément ressort (10) et une unité de verrouillage mécanique (11).
PCT/DE2021/100972 2021-01-08 2021-12-06 Système de freinage à frein à commande électrique d'un véhicule, utilisation et véhicule équipé d'un système de freinage à frein à commande électrique WO2022148509A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180089792.2A CN116685510A (zh) 2021-01-08 2021-12-06 车辆的线控制动系统，应用和具有线控制动系统的车辆

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021100202.8A DE102021100202B3 (de) 2021-01-08 2021-01-08 Brake-by-wire-Bremssystem eines Fahrzeug, Verwendung und Fahrzeug mit einem Brake-by-wire-Bremssystem
DE102021100202.8 2021-01-08

Publications (1)

Publication Number Publication Date
WO2022148509A1 true WO2022148509A1 (fr) 2022-07-14

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PCT/DE2021/100972 WO2022148509A1 (fr) 2021-01-08 2021-12-06 Système de freinage à frein à commande électrique d'un véhicule, utilisation et véhicule équipé d'un système de freinage à frein à commande électrique

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CN (1) CN116685510A (fr)
DE (1) DE102021100202B3 (fr)
WO (1) WO2022148509A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023002334A1 (de) 2023-06-09 2024-02-08 Mercedes-Benz Group AG Kraftwagen mit einer Betriebsbremse sowie Verfahren zum Betreiben einer solchen Betriebsbremse

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2443921A (en) 2006-11-02 2008-05-21 Trw Ltd Fail-safe hydraulic braking system
JP2008213688A (ja) * 2007-03-06 2008-09-18 Isao Matsuno 車両用ブレーキ装置
EP1818235B1 (fr) 2006-02-14 2011-05-18 Delphi Technologies, Inc. Système de freinage de type 'freinage électronique' à sécurité hydraulique intégrée
DE102010001939A1 (de) * 2010-02-15 2011-08-18 Robert Bosch GmbH, 70469 Bremskraftverstärker sowie Verfahren und Vorrichtung zu dessen Betrieb
US20110253489A1 (en) * 2010-04-16 2011-10-20 Ward Gregory A Apparatus and a System for Mitigating Wheel Skidding In a Manual Brake System
US20120061193A1 (en) * 2010-09-13 2012-03-15 Jochen Mayer Braking system for a vehicle
CN103950442A (zh) * 2014-04-14 2014-07-30 同济大学 可调杠杆支点的机械式电子液压制动系统
US20170072928A1 (en) * 2015-09-11 2017-03-16 Mando Corporation Electric brake system
US20170297546A1 (en) * 2015-02-27 2017-10-19 Hitachi Automotive Systems, Ltd. Brake control device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818235B1 (fr) 2006-02-14 2011-05-18 Delphi Technologies, Inc. Système de freinage de type 'freinage électronique' à sécurité hydraulique intégrée
GB2443921A (en) 2006-11-02 2008-05-21 Trw Ltd Fail-safe hydraulic braking system
JP2008213688A (ja) * 2007-03-06 2008-09-18 Isao Matsuno 車両用ブレーキ装置
DE102010001939A1 (de) * 2010-02-15 2011-08-18 Robert Bosch GmbH, 70469 Bremskraftverstärker sowie Verfahren und Vorrichtung zu dessen Betrieb
US20110253489A1 (en) * 2010-04-16 2011-10-20 Ward Gregory A Apparatus and a System for Mitigating Wheel Skidding In a Manual Brake System
US20120061193A1 (en) * 2010-09-13 2012-03-15 Jochen Mayer Braking system for a vehicle
CN103950442A (zh) * 2014-04-14 2014-07-30 同济大学 可调杠杆支点的机械式电子液压制动系统
US20170297546A1 (en) * 2015-02-27 2017-10-19 Hitachi Automotive Systems, Ltd. Brake control device
US20170072928A1 (en) * 2015-09-11 2017-03-16 Mando Corporation Electric brake system

Also Published As

Publication number Publication date
DE102021100202B3 (de) 2021-11-18
CN116685510A (zh) 2023-09-01

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