EP1928713A1 - Procede et dispositif de serrage d'un frein de stationnement hydraulique - Google Patents

Procede et dispositif de serrage d'un frein de stationnement hydraulique

Info

Publication number
EP1928713A1
EP1928713A1 EP06792295A EP06792295A EP1928713A1 EP 1928713 A1 EP1928713 A1 EP 1928713A1 EP 06792295 A EP06792295 A EP 06792295A EP 06792295 A EP06792295 A EP 06792295A EP 1928713 A1 EP1928713 A1 EP 1928713A1
Authority
EP
European Patent Office
Prior art keywords
parking brake
pressure
clamping force
electric motor
hydraulic pressure
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Withdrawn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
EP06792295A
Other languages
German (de)
English (en)
Inventor
Josef Knechtges
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 EP1928713A1 publication Critical patent/EP1928713A1/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Withdrawn legal-status Critical Current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
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/08—Brake-action initiating means for personal initiation hand actuated
    • B60T7/10—Disposition of hand control
    • B60T7/107—Disposition of hand control with electrical power assistance
    • 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
    • B60T8/404—Control of the pump unit
    • B60T8/4054—Control of the pump unit involving the delivery pressure control
    • 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

Definitions

  • the invention generally relates to the field of hydraulic parking brakes.
  • the invention is directed to such parking brakes in which an electromotive-operated pressure transducer unit is provided for establishing a hydraulic pressure.
  • a hydraulic vehicle brake which can be used both as a service brake and as a parking brake (also called parking brake).
  • a service brake hydraulic fluid is introduced under pressure into a hydraulic chamber delimited by a movable brake piston in the usual way.
  • the pressure buildup in the hydraulic chamber leads to the displacement of the brake piston and a friction lining cooperating with the brake piston in the direction of a brake disc which is braked by the pressed-on friction lining.
  • the vehicle brake can be used not only as a service brake, but also as a parking brake, it has an electric motor operated mother / spindle assembly.
  • the nut / spindle arrangement allows a mechanical actuation of the brake piston and a locking of the brake piston in a state in which the friction lining is pressed against the brake disc.
  • the electromotive drive for the nut / spindle arrangement must be dimensioned correspondingly high performance.
  • the mother / spindle arrangement is actuated as a function of the hydraulic pressure prevailing in the parking brake circuit. To determine the hydraulic pressure in the parking brake operation so far pressure sensors are provided.
  • the invention is based on the object of specifying a technique for the pressure-sensorless determination of the hydraulic pressure prevailing in the parking brake circuit.
  • a method of tensioning a hydraulic parking brake comprising the steps of generating a tensioning force by building up a hydraulic pressure in a parking brake circuit using a pressure generator unit driven by an electric motor, detecting at least one engine related parameter Conclusion on the prevailing hydraulic pressure in the parking brake circuit, and the driving of a clamping force assistance device in dependence on the detected engine-related parameter includes.
  • the control of the clamping force-supporting device is thus not, at least not exclusively, in response to a signal from a pressure sensor. Rather, a motor-related parameter is considered in the control, which allows a conclusion on the pressure prevailing in the parking brake circuit hydraulic pressure. For example, the tensioning assistance device can then
  • the detected engine-related parameter indicates a sufficiently high hydraulic pressure in the parking brake circuit.
  • the value of the detected parameter are compared with a predefined value (eg a threshold value).
  • engine-related parameters that allow a conclusion on the pressure prevailing in a brake circuit and in particular in the parking brake hydraulic pressure. These parameters include, for example, the motor drive torque. The higher the drive torque of the electric motor, the higher is the pressure prevailing in the brake circuit hydraulic pressure as a rule.
  • the pressure-dependent parameters also include the power consumption (for example, the power requirement) of the electric motor, which also makes it possible to draw conclusions about the engine drive torque. If the electric motor is controlled by means of pulse width modulation, an average power consumption can be determined from the pulse widths. The average power consumption can be determined by time integration or extrapolation of the pulses.
  • the speed of the electric motor (or the speed of the coupled to the electric motor pressure transducer unit) may be called. For example, a decrease in the speed with unchanged control to a pressure increase (and vice versa).
  • Speed detection is preferably based on a measurement of the generator voltage generated by the electric motor.
  • the generated generator voltage is in a fixed relationship to the engine speed. If the electric motor is controlled by means of pulse width modulation, the generator voltage can be measured during the pulse pauses.
  • the activation can be effected as a function of two or more detected motor-related parameters.
  • the clamping force support device can be actuated when the power consumption increases with decreasing speed. Both an increasing power consumption and a decreasing speed indicate a pressure increase in the parking brake circuit.
  • the clamping force support device is preferably designed to generate a clamping force (in addition to the hydraulically applied pressure) and / or to maintain a generated clamping force. It can be around a (eg motor-driven) mechanical device about the nature of a mother / spindle arrangement act.
  • a method for sensorless determination of the hydraulic pressure in a brake circuit, in particular a parking brake circuit, with an electromotive operated and controlled by pulse width modulation pressure transmitter unit includes the steps of integrating or extrapolating the pulses to determine a motor-related parameter in terms of average power consumption and determining the hydraulic pressure based on the determined power consumption.
  • the invention further provides a device for tensioning a hydraulic parking brake.
  • the device comprises an electric motor, a pressure transmitter unit driven by the electric motor which builds up a hydraulic pressure to generate a clamping force in a parking brake circuit, a clamping force support device for the parking brake and a control device for detecting at least one motor-related parameter, which draws a conclusion on the in Parking brake circuit allowed hydraulic pressure, and for
  • the pressure transmitter unit is provided either specifically and exclusively for the purpose according to the invention or a component already present in the brake system. So it may be at the pressure transmitter unit to a
  • Component of a system for driving stability improvement such as an ABS or ESP pump act.
  • FIG. 1 shows a hydraulic parking brake system with a tensioning device according to the invention
  • FIG. FIG. 2 is a flowchart of a first embodiment of a method for tensioning a parking brake
  • FIG. 3 shows a flowchart of a second exemplary embodiment of a method for tensioning a parking brake.
  • Fig. 1 shows an embodiment of a brake system 10 with hydraulic parking brake functionality.
  • the brake system 10 includes two separate ones
  • Hydraulic circuits with a brake circuit distribution for example, the x-split type.
  • a brake circuit distribution for example, the x-split type.
  • only a single hydraulic circuit 12 with only a single wheel brake 14 is shown in more detail in FIG.
  • Brake pressure generator unit 16 is provided.
  • the brake pressure generator unit 16 comprises a brake pedal 18, a brake booster 20, a master cylinder 22 coupled to both brake circuits, and a pressureless reservoir 24 for hydraulic fluid.
  • the invention could also be implemented in brake-by-wire systems.
  • valve arrangements 26, 28, 30, 32, a pressure accumulator 34 for hydraulic fluid and an ESP hydraulic unit with an electric motor 36 and a pressure generator unit 38 driven by the electric motor 36 in the form of a pump are provided in the usual way intended.
  • the valve 26 is associated with an overpressure component 40.
  • a clamping force assistance device 42 as well as a control device 44 electrically coupled to the clamping force assistance device 42 and the electric motor 36 are used.
  • the clamping force support device 42 includes in the exemplary embodiment a mechanical locking component, for example in the form of a nut / spindle arrangement and a motor drive provided for this purpose (both are not shown in FIG. 1).
  • the pressure generator 38 driven by the electric motor 36 is closed when the valves 26 are closed and 32 and opened valves 28 and 30 in the resulting parking brake circuit, first, a hydraulic pressure is built up.
  • the building up hydraulic pressure generated in the wheel brake 14 a clamping force.
  • the motor drive torque generated by the electric motor 36 is then evaluated as a measure of the pressure prevailing in the parking brake circuit hydraulic pressure. As soon as the motor drive torque reaches or exceeds a predetermined value, the control device 44 activates the clamping force assistance device 42 in order to mechanically increase and / or maintain the lo hydraulically generated application force.
  • the motor drive torque can be determined, for example, from the measured power consumption of the electric motor 36.
  • Parking brake (HPB) explained.
  • the driver activates the parking brake by actuating an HPB switch.
  • the hydraulic parking brake could also be activated independently of an explicit driver's request and automatically by a controller (e.g., when stopping and starting on the mountain).
  • control unit of the electric motor of an ESP or ABS feed pump by means of pulse width modulation (PWM) according to a predetermined control program
  • the electric motor is supplied with a predetermined pulse voltage Uimpuis during the (variable) pulse duration.
  • the electric motor is thus energized during the pulse duration and energized during the break time.
  • the ratio of pulse duration (“switch-on time”) to pause time (“switch-off time”) determines the speed of the motor, as this is due to its
  • the control unit determines the integral mean value 35 of the pulse voltage Uimpuis.
  • the measurements required for this purpose can be carried out, for example, after each PWM period. However, it would also be conceivable, starting from the current measured value, the expected measured values in the To extrapolate the future and to calculate the integral mean value of the pulse voltage Uimpuis on the basis of the extrapolated values.
  • the integral mean value of the pulse voltage calculated in step 206 is a measure of the average power consumption of the electric motor and therefore allows a conclusion on the motor drive torque and based on empirical determination of the prevailing in the parking brake circuit hydraulic pressure.
  • Pulse voltage Uimpu is a predetermined reference value U ref . already reached or exceeded. From reaching or exceeding the reference value U re f. can be concluded that the electric motor is heavily loaded and a sufficiently high hydraulic pressure prevails in the parking brake circuit. If the comparison in step 208 leads to a negative result, the method branches back to step 206. Otherwise, in a next step 210, a clamping force assistance device is actuated in order to at least maintain the (pre-) clamping force of the parking brake resulting from the hydraulic pressure and the parking brake thus convert into a preferably mechanically closed state.
  • the clamping force support device may be equipped for this purpose with a self-locking mechanism, so that the clamping force support device after closing the parking brake in step 210 no longer requires a further electrical power supply.
  • FIG. 3 shows in a flow chart 300 a further embodiment of a
  • Steps 302, 304 and 306 correspond to steps 202, 204 and 206 already explained with reference to FIG. 2.
  • pump speed np is additionally determined by pe (or alternatively the engine speed). The determination of the speed is based on the knowledge that a time-decreasing speed indicates a stronger engine load and thus an increasing hydraulic pressure in the parking brake circuit.
  • the speed detection can be characterized, for example take place that during the pause time between the pulses, the electromotive force induced by the electric motor (also called generator voltage UG) measured and evaluated as a measure of the pump speed.
  • step 208 In connection with step 208 explained review of the integral mean value of the pulse voltage Ui mpu is performed. If this mean value the reference value U ref . is exceeded, it is checked in a next step 312 whether the pump speed npumpe below a speed reference value n re f. lies. If this is not the case, the method branches from step 312 back to step 308. Otherwise, the method continues with step 314, which corresponds to step 210 already explained above. The checks in steps 310 and 312 cause activation of the tensioning assistance device as power consumption increases as the speed decreases.
  • Figs. 2 and 3 embodiments of inventive method can be implemented, for example, in the brake system shown in Fig. 1 or in a differently designed brake system.
  • the reference values Uref. and riref. can be practically determined and then stored in the control device.
  • the pressure in the parking brake circuit can also be determined, or at least estimated, without force sensors by evaluating engine-related parameters.
  • the invention therefore allows the implementation of a pressure sensorless system.
  • the invention may also be implemented (e.g., as a fallback solution) in systems equipped with pressure sensors.
  • the invention makes it possible to end the pressure build-up in the parking brake circuit at the earliest possible time. This protects the vehicle battery (especially when the vehicle engine is switched off) and prevents a pressure-calibrating, but noisy, overflow of pressure compensating valves.
  • the approach used namely the detection of a motor-related parameter that allows a conclusion on the hydraulic pressure, but can also be used for hydraulic pressure determination in a service brake circuit.
  • the steps 204 to 208 according to Rg. 2 and 304 to 312 according to FIG. 3 can also be used for determining the hydraulic pressure in a service brake circuit.
  • the service brake circuit can be, for example, an electrohydraulic brake circuit based on the break-by-wire principle.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif de serrage d'un frein de stationnement hydraulique. Ce procédé consiste à générer une force de serrage par l'établissement d'une pression hydraulique dans un circuit de frein de stationnement à l'aide d'une unité capteur de pression (38) entraînée par un moteur électrique (36) ; puis à détecter au moins un paramètre lié au moteur et qui permet un retour à la pression hydraulique régnant dans le circuit du freins de stationnement et enfin à commander un dispositif d'assistance à la force de serrage (42) en fonction du paramètre détecté lié au moteur, ce qui rend superflu tout capteur de pression.
EP06792295A 2005-09-30 2006-09-27 Procede et dispositif de serrage d'un frein de stationnement hydraulique Withdrawn EP1928713A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005046991.4A DE102005046991B4 (de) 2005-09-30 2005-09-30 Verfahren und Vorrichtung zum Spannen einer hydraulischen Parkbremse
PCT/EP2006/009409 WO2007039217A1 (fr) 2005-09-30 2006-09-27 Procede et dispositif de serrage d'un frein de stationnement hydraulique

Publications (1)

Publication Number Publication Date
EP1928713A1 true EP1928713A1 (fr) 2008-06-11

Family

ID=37733996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06792295A Withdrawn EP1928713A1 (fr) 2005-09-30 2006-09-27 Procede et dispositif de serrage d'un frein de stationnement hydraulique

Country Status (5)

Country Link
US (1) US20100033009A1 (fr)
EP (1) EP1928713A1 (fr)
CN (1) CN101304908B (fr)
DE (1) DE102005046991B4 (fr)
WO (1) WO2007039217A1 (fr)

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DE102009047127B4 (de) * 2009-11-25 2023-07-27 Robert Bosch Gmbh Verfahren zum Betreiben einer Feststellbremse eines Fahrzeugs
DE102010040572A1 (de) * 2010-09-10 2012-03-15 Robert Bosch Gmbh Verfahren zum Einstellen der von einer Feststellbremse ausgeübten Klemmkraft
DE102011079362B4 (de) * 2011-07-19 2024-08-08 Continental Automotive Technologies GmbH Verfahren zum Nachspannen einer elektromechanischen Bremse und elektromechanische Bremse
DE102011080169A1 (de) 2011-08-01 2013-02-07 Robert Bosch Gmbh Kommunikationsanbindung für Sensorik in Fahrzeug-Regelsystemen
KR101942918B1 (ko) * 2012-05-03 2019-01-28 삼성전자주식회사 칩 온 필름 패키지 및 이를 포함하는 장치 어셈블리
KR101575432B1 (ko) * 2013-12-19 2015-12-07 현대자동차주식회사 변속기 파킹조작장치 제어방법
DE102016222045A1 (de) * 2016-11-10 2018-05-17 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben einer Bremsanlage eines Kraftfahrzeugs, Bremsanlage
US10611356B2 (en) * 2018-03-30 2020-04-07 Veoneer Us, Inc. System and method for transient wake up of processor controlling a motor of a brake booster subsystem
JP7484771B2 (ja) 2021-02-26 2024-05-16 株式会社アドヴィックス 制御装置

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Also Published As

Publication number Publication date
DE102005046991A1 (de) 2007-04-12
DE102005046991B4 (de) 2019-10-17
US20100033009A1 (en) 2010-02-11
CN101304908B (zh) 2011-05-18
CN101304908A (zh) 2008-11-12
WO2007039217A1 (fr) 2007-04-12

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