WO2013000598A1 - Procédé de fonctionnement pour frein à commande électrique, frein à commande électrique et système de freinage - Google Patents

Procédé de fonctionnement pour frein à commande électrique, frein à commande électrique et système de freinage Download PDF

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Publication number
WO2013000598A1
WO2013000598A1 PCT/EP2012/056898 EP2012056898W WO2013000598A1 WO 2013000598 A1 WO2013000598 A1 WO 2013000598A1 EP 2012056898 W EP2012056898 W EP 2012056898W WO 2013000598 A1 WO2013000598 A1 WO 2013000598A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
pressure
motor
clutch
power train
Prior art date
Application number
PCT/EP2012/056898
Other languages
German (de)
English (en)
Inventor
Kai Schade
Paul Linhoff
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
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Publication of WO2013000598A1 publication Critical patent/WO2013000598A1/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
    • 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
    • B60T13/741—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 an ultimate actuator

Definitions

  • the invention relates to a method for operating an electrically actuated brake with an electric motor and a power train, which transmits the torque of the motor to an actuator, which converts a rotational movement into a translational movement of a brake element, wherein the pressure buildup of the motor in
  • Pressure build-up direction rotates and thereby presses the brake element against a brake body. It further relates to an associated electrically actuated brake and an associated brake system.
  • the brakes are controlled electronically ("by wire") by means of a control and regulation unit
  • the driver's braking request in such systems is determined by an actuation unit with a brake pedal, for example the pedal travel the way that the brake pedal ⁇ inserted by pressing the driver's back, as measured by an appropriate sensor and the control and regulating unit is used as an input variable to the SET ⁇ development of the corresponding brake pressure or the corresponding tightening force in the brakes.
  • the driver's braking intention is to a certain extent in a target braking torque is converted, which the control and regulating unit as a target size for Adjustment of the corresponding brake pressure is used.
  • the driver is characterized by the
  • Actuation of the brakes decoupled. This allows z. As the implementation of safety routines such as ABS, ESP, TCS, etc., in which the brake pressure is wheel individually and briefly increased and decreased several times without the driver feels these processes on the foot. The so-called “pumping" of the brake pedal can be avoided in this way.
  • Electromechanically actuated or electromechanical brakes are often used in the abovementioned brake systems.
  • the application of such brakes is carried out by the driving of an electric motor whose rota ⁇ toric movement of the motor shaft is converted by an actuator in a translational movement.
  • the actuator may be configured, for example, as a ball screw (KGT), wherein upon rotation of the spindle by the rotor (via an intermediate gear) a rotatably mounted on the spindle Spindelmut ⁇ ter is placed in a translational movement, whereby then the brake piston is moved.
  • KKT ball screw
  • actuatable wheel brakes of the brake system can be actuated electrically by means of an electrically controllable pressure supply device.
  • an electrically controllable pressure supply device for this is the
  • Brake pressures are generated on small time scales.
  • the motor and the actuator are directly coupled via a power train.
  • the mechanical output quantity (pressure force) and the mechanical input quantity (motor position or speed) are direct
  • ABS anti-lock braking system
  • ESP electronic stability program
  • Traction Control System (TCS), 7) are both extremely large and fast pressure or force strokes as well as fast
  • the invention is therefore based on the object to improve this Situ ⁇ tion and the different requirements for electrically actuated brakes and their operation in
  • the above object is, in particular in fast control operations achieved in a first variant in that for pressure build the Kupp ⁇ lung is substantially completely engaged, and the motor rotates in the direction of pressure buildup, and that to reduce the pressure, the clutch is substantially is completely disengaged.
  • substantially complete engagement or disengagement is meant that disengages completely or almost completely, which means ranges of about 90 to 100%.
  • it is preferably an electrically actuated brake with an electric motor and a power train, the torque of the engine to a
  • Actuator transmits, which converts a rotary motion via a hydraulic pump into a translational movement of a brake element.
  • the invention is based on the consideration that an essential reason for the above design compromises in the design of the electric motor of an electric
  • operable brake is in the direct or rigid coupling of the motor and actuator.
  • this design conflict or compromise can be avoided by resolving this rigid or direct connection and by switching a clutch into the power train which transfers the torque of the electric motor to the actuator, the latter being controlled in this way in that the pressure build-up is almost or completely engaged, so that the full torque of the engine is available, but that it is almost or completely decoupled for pressure reduction.
  • a pressure reduction can be achieved without the motor has to change its direction of rotation. That is, in order to enable a short-term pressure reduction, it is sufficient to decouple the actuator from the engine. Once disengaged, the speed and direction of rotation of the motor are arbitrary in some ways, as they are irrelevant due to the non-existing frictional connection.
  • the decoupling can be achieved in ⁇ example by a controllable coupling in the form of a (mechanical) coupling. In this way, the pressure / actual force can decrease (pressure build-up) while the engine speed is maintained, increases or only slightly sinks. Thus, the engine can be large, heavy and powerful designed, without compromises must be made in the rapid pressure reduction.
  • the clutch is substantially fully engaged and the motor is rotated in reverse to the pressure buildup direction.
  • the direction of rotation of the motor between pressure build-up and pressure reduction is reversed.
  • the clutch is substantially fully engaged. In this case, both the pressure build-up and the pressure reduction, a direct coupling or almost complete coupling zwi ⁇ 's actuator and motor is given.
  • the clutch is substantially fully engaged and the motor rotates in the opposite direction to the pressure build-up direction, and wherein during braking operations with automatic brake control for pressure reduction, the clutch is substantially completely disengaged and the engine rotates in the pressure build-up direction.
  • the direction of rotation is not reversed and the pressure reduction exclu ⁇ Lich realized by a complete or nearly complete From ⁇ coupling of the clutch. In this way, pressure can be quickly built up again by engaging the clutch. This can also happen several times in a sequence. Only when the control process is completed and the driver no longer expresses a braking request, the direction of rotation of the motor is set opposite to the pressure build-up direction to reduce the pressure in the brake.
  • the motor is rotated in the pressure build-up direction until the control process is completed.
  • an electrically operable brake with an electric motor and a power train, which transmits the torque of the motor to an actuator, which converts a rotational movement into a translational movement of a brake element, wherein the pressure buildup of the engine in pressure build ⁇ rotates direction and thereby presses the brake element against a brake body, wherein in the power train, a clutch is connected.
  • the brake may be an electromechanically or hydraulically actuated brake.
  • the actuator comprises an at least partially hydraulic coupling between
  • the electrically actuated brake advantageously has a power train with a transmission, wherein the clutch is arranged in the power train between the engine and transmission. This point in the power path deals with comparatively high speeds and comparatively small torques, which allows a compact design of the clutch.
  • the clutch is advantageously designed as rheological Kupp ⁇ lung with a magneto or elektrorheologi-'s material.
  • a rheological material changes its state of aggregation depending on the strength of an applied magnetic or electric field. If there is no electromagnetic field, at ordinary operating temperatures in the range from -40 to 150 ° C, the rheological material is in liquid aggregate ⁇ state before. By applying an electromagnetic field, the physical state of this material can be changed from liquid to solid in an analogous, ie continuous, manner.
  • Such a clutch has the advantages over other clutches such as friction clutches or multi-plate clutches that it is extremely maintenance-free and reliable.
  • the amendments ⁇ conclusions of the states of matter from liquid to solid liquid again, etc., are for all practical purposes and use during the typical life of an EMF of about 15 years completely reversible. Such a coupling also has no wear parts .
  • control unit can also be integrated in the brake, whereby an advantageous embodiment of a
  • electromechanical brake is realized.
  • the advantages of the invention are, in particular, that an adjustable clutch in the power train which decouples the motor from the actuator, an improvement in the speed of braking force build-up and degradation can be achieved in electro-hydraulic or mechatronic brake systems.
  • electro-hydraulic brake systems to the eccentric shaft end of the pump motor from the Mo ⁇ door shaft by said coupling can be separated.
  • ⁇ by such braking systems can be cost-effectively constructed with ⁇ space, weight and power consumption advantages.
  • FIG. 1 is an electromechanical brake according to the prior
  • FIG. 2 shows a typical application or pressure buildup characteristic
  • FIG. 3 an electrically actuated brake in one
  • FIG. 4 Pressure buildup characteristic for a brake according to
  • FIG. 1 A first figure.
  • FIG. 5 is a generalized pressure buildup curve for egg ⁇ ne brake according to FIG. Third
  • I Mot phase k and k Re u i ng b denote a constant, respectively the current, ⁇ 1 is the angular velocity, ⁇ 1 whose time derivative and the rotational moment J of the armature, the pinion and the gear, that is, the total rotation torque.
  • FIG. 1 The in FIG. 1 system is limited in principle by the direct coupling of motor 8 and ball screw 20 and Bremskol ⁇ ben 26 and the consequent direct reduction of the mechanical braking torque M MeCh with increasing ⁇ 1 . From a certain quotient F / t or a certain time derivation of the force F, F, either certain forces are no longer or only at all approachable very slowly.
  • FIG. 3 The in FIG. 3 is shown in a highly schematic manner
  • Electrically actuated brake 4 comprises, in a preferred disclosed embodiment, an electric motor 8 with pinion 10, a gear 14, a ball screw 20, a brake piston 26 and a brake pad 32.
  • a hydraulic operative connection / coupling 22 is arranged between the ball screw 20 and the brake piston 26.
  • Ball screw 20 and optionally active connection / coupling 22 thus form an actuator, which rotates a movement of the spindle nut rotatably mounted in the spindle of the ball screw in a
  • the parameter shall designate the degree of coupling.
  • Brake 2 of FIG. 1 applies during heavy pressure build-up:
  • the brake 4 according to FIG. 3 is the force F due to the
  • FIG. 4 is plotted on the abscissa 46 of the rotation angle ⁇ and on the ordinate 40, the corresponding ⁇ de force exerted by a brake force F.
  • FIG. 5 A similar diagram for operating a brake 4 according to the invention with a coupling 60 is shown in FIG. 5 is shown.
  • the rotation angle cp On the x-axis 90 is the rotation angle cp, on the y-axis 96 is the degree of coupling and on the z-axis 102, the force F is plotted.
  • P 2 again corresponds to the presence of a high clamping force, for example during the Blocking the wheel.
  • the characteristic along the y-axis 96 to the point P 3 * is now followed. How depicting ⁇ development can be seen at this, the engine speed need not be reduced in pressure reduction in this way.
  • the degradation of the Dru ⁇ ckes so happens here to some extent along the y-axis 96 perpendicular to the x-axis 90 is entirely due to the Ansteue- tion of the clutch 60th
  • the mechatronic drive can be dropped as quickly as possible in the event of a failure of the higher-level control unit, for example because of a defect in the hardware, a loss of the supply voltage, a fault in the software or the like further pressure build-up can be prevented, because when switching off (de-energized state), the electromagnetic excitation of the clutch is eliminated and then opens due to their normally open property.
  • Brake system can be an improvement for any type
  • engine-actuated application can be achieved, in which both repeated rapid reversal of the actuator motor as well as high speeds and speed gradients occur equally.
  • Fields of application are, for example, purely electromechanically actuated brakes with a corresponding electric motor for clamping force, electro-hydraulic brake systems with a pressure supply device with an electric motor or electro-hydraulically / electromechanically combined braking systems.
  • quick position ⁇ change can be achieved in ABS operations.
  • Electric motor operable piston of a piston-cylinder arrangement the electric motor for recovering delivery volume can be quickly reduced and so a regular, rapid pressure build-up can be achieved.
  • electrohydraulic brake systems with a piston pump the concepts presented here can find application.
  • the pump motor eccentric activating the piston pump are decoupled from the pump motor shaft, so that they can assume variable relative speeds (also with opposite sign / direction of rotation) due to the decoupling degree which can be controlled analogously.
  • the pump motor is kept at a predetermined speed, e.g. because a continuous control intervention is expected while the piston pump is temporarily disconnected, and does not need to start up at a resumption.
  • these systems can be provided by the introduction of a clutch in the power train for a rapid pressure reduction, which

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Braking Systems And Boosters (AREA)
  • Regulating Braking Force (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

L'invention concerne un procédé de fonctionnement pour frein (4) à commande électrique, comportant un moteur électrique (8) et une chaîne cinématique qui transmet le couple du moteur (8) à un actionneur transformant un mouvement de rotation en un mouvement de translation d'un élément de freinage, le moteur (8) tournant dans le sens de montée en pression pour faire monter la pression et poussant ainsi l'élément de freinage contre un corps de freinage, un embrayage (60) étant monté dans la chaîne cinématique, permettant aux freins à commande électrique et à leur fonctionnement de satisfaire à diverses exigences de puissance et de rapidité de la montée en pression et de la baisse de pression. A cet effet, l'embrayage (60) est sensiblement embrayé à fond et le moteur (8) tourne dans le sens de montée en pression pour faire monter la pression, et l'embrayage (60) est sensiblement débrayé à fond pour faire baisser la pression.
PCT/EP2012/056898 2011-06-29 2012-04-16 Procédé de fonctionnement pour frein à commande électrique, frein à commande électrique et système de freinage WO2013000598A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110078272 DE102011078272A1 (de) 2011-06-29 2011-06-29 Verfahren zum Betreiben einer elektrisch betätigbaren Bremse, elektrisch betätigbare Bremse und Bremssystem
DE102011078272.9 2011-06-29

Publications (1)

Publication Number Publication Date
WO2013000598A1 true WO2013000598A1 (fr) 2013-01-03

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DE (1) DE102011078272A1 (fr)
WO (1) WO2013000598A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016066122A1 (fr) 2014-10-29 2016-05-06 Bwi (Shanghai) Co., Ltd. Ensemble servofrein

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955080A1 (de) * 1999-11-15 2001-05-17 Continental Teves Ag & Co Ohg Betätigungseinheit für eine elektromechanisch betätigbare Feststellbremse für Kraftfahrzeuge
GB2366341A (en) * 2000-09-02 2002-03-06 Bosch Gmbh Robert Improving rapid reversal of an electric motor driven brake actuator having a brake lock
DE102004012355A1 (de) 2003-03-18 2004-09-30 Continental Teves Ag & Co. Ohg Betätigungseinheit für eine elektromechanisch betätigbare Scheibenbremse
US20070074938A1 (en) * 2004-03-29 2007-04-05 Han-Yong Cho Brake actuating apparatus using an electric motor
WO2010069679A1 (fr) * 2008-12-18 2010-06-24 Robert Bosch Gmbh Procédé de commande d'un actionnement de frein d'un véhicule hybride
WO2011029812A1 (fr) 2009-09-11 2011-03-17 Continental Teves Ag & Co. Ohg Installation de freinage pour véhicules automobiles et procédé pour son fonctionnement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955080A1 (de) * 1999-11-15 2001-05-17 Continental Teves Ag & Co Ohg Betätigungseinheit für eine elektromechanisch betätigbare Feststellbremse für Kraftfahrzeuge
GB2366341A (en) * 2000-09-02 2002-03-06 Bosch Gmbh Robert Improving rapid reversal of an electric motor driven brake actuator having a brake lock
DE102004012355A1 (de) 2003-03-18 2004-09-30 Continental Teves Ag & Co. Ohg Betätigungseinheit für eine elektromechanisch betätigbare Scheibenbremse
US20070074938A1 (en) * 2004-03-29 2007-04-05 Han-Yong Cho Brake actuating apparatus using an electric motor
WO2010069679A1 (fr) * 2008-12-18 2010-06-24 Robert Bosch Gmbh Procédé de commande d'un actionnement de frein d'un véhicule hybride
WO2011029812A1 (fr) 2009-09-11 2011-03-17 Continental Teves Ag & Co. Ohg Installation de freinage pour véhicules automobiles et procédé pour son fonctionnement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016066122A1 (fr) 2014-10-29 2016-05-06 Bwi (Shanghai) Co., Ltd. Ensemble servofrein
EP3212478A4 (fr) * 2014-10-29 2018-05-09 BWI (Shanghai) Co., Ltd. Ensemble servofrein

Also Published As

Publication number Publication date
DE102011078272A1 (de) 2013-01-03

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