WO2007068616A1 - Procede de determination d'une zone de surcharge d'un frein electrique - Google Patents

Procede de determination d'une zone de surcharge d'un frein electrique Download PDF

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Publication number
WO2007068616A1
WO2007068616A1 PCT/EP2006/069266 EP2006069266W WO2007068616A1 WO 2007068616 A1 WO2007068616 A1 WO 2007068616A1 EP 2006069266 W EP2006069266 W EP 2006069266W WO 2007068616 A1 WO2007068616 A1 WO 2007068616A1
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WO
WIPO (PCT)
Prior art keywords
electric motor
overload
current consumption
extreme
time
Prior art date
Application number
PCT/EP2006/069266
Other languages
German (de)
English (en)
Inventor
Dirk Grobe
Martin Kissling
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2007068616A1 publication Critical patent/WO2007068616A1/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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting

Definitions

  • the invention relates to a method for determining an overload range of an electric brake, a corresponding computing unit, a corresponding computer program and a corresponding computer program product.
  • the electric parking brake (EPB, also called electromechanical parking brake EMF) is operated by the vehicle interior by means of a switch or push button.
  • EMF electromechanical parking brake EMF
  • the electric parking brake in various situations, the driver a useful help or contribute to additional safety.
  • the electric parking brake can be activated manually or automatically depending on the situation.
  • the brake is usually detected by means of an electric motor, which can be connected to the brake directly or via cable pull.
  • an electric motor which can be connected to the brake directly or via cable pull.
  • the rope is tensioned with a predetermined force or applied to the brake with a predetermined force.
  • electric parking brakes are typically with equipped with a slip clutch. Due to the design principle of the slip clutch slip on reaching the predetermined / adjustable overload components through or past each other, thus damaging the brake is avoided. In this situation, the
  • Braking force can not be increased further, otherwise damage to the engine, the cable or other mechanical components is expected.
  • Atlas Copco electric tools detect a slip clutch area acoustically.
  • microphones are arranged in the tool, which are provided for receiving the friction clutch noise. If the friction clutch noise is detected, the power supply to the electric motor is interrupted. For electric parking brakes, such a method is not suitable because it is error-prone and responsive.
  • the problem therefore arises of specifying a method for determining an overload range of an electric brake with which an overload condition can be detected quickly and reliably in order to avoid damage to the brake system as far as possible.
  • an overload range of an electric brake in particular a parking brake, is determined on the basis of a current consumption of the electric motor which drives or actuates the brake.
  • the power consumption is particularly easy to detect in an electric motor, as no consuming measuring devices are needed. Based on the current consumption, a conclusion about the load condition is possible.
  • the overload range is determined by a time course, i. a temporal change, the power consumption of the electric motor determines.
  • this is conventionally equipped with an overload protection, such as a slip clutch. If the brake is in the overload range, the overload protection leads to a characteristic course of the power consumption, as will be explained in detail in the following description of the preferred example of a friction clutch.
  • the method is not limited to this embodiment, but can always be used when the overload range is noticeable by a temporal change in the current consumption of the electric motor.
  • an overload condition can be determined particularly simply, reliably and above all in real time. This can be advantageously dispensed with the measured values of an existing force sensor, which often provides incorrect values in an overload region, and therefore does not meet regulatory requirements regularly.
  • legal requirements can be met with the described solution.
  • the overload range is determined based on at least one parameter of at least one extreme point, ie a local maximum or minimum, in the time course of the current consumption of the electric motor. The temporal course of the
  • the at least one parameter is selected from the group: a) type of extreme point, wherein in particular a distinction is made between maximum and minimum; b) Validity of the extreme point, in particular between a valid and an invalid or withdrawn
  • the current consumption can be characterized particularly reliably.
  • the overload range is determined based on the number of valid extreme points within a predetermined period in the time course of the current consumption of the electric motor, wherein a valid extreme point defined by the predetermined threshold value of the current difference.
  • the current consumption can be characterized quickly and reliably by means of only three parameters.
  • the limits used for the parameters can be set once before starting the procedure. They can be obtained, for example, from a measurement.
  • An arithmetic unit according to the invention has computation means for the steps of a method according to the invention by feeders. It can be designed in particular as a control unit in a motor vehicle.
  • a further advantageous embodiment of the inventive computing unit has means for determining extreme points in the time course of the measured values.
  • a computer or microprocessor program according to the invention contains program code means for carrying out the method according to the invention when the program is executed on a computer, a microprocessor or a corresponding arithmetic unit, in particular the arithmetic unit according to the invention.
  • a computer or microprocessor program product contains program code means which are stored on a machine- or computer-readable data carrier in order to carry out a method according to the invention if the program product is stored on a computer, a microprocessor or on a corresponding arithmetic unit, in particular the arithmetic unit according to the invention, is performed.
  • Suitable data carriers are in particular floppy disks, hard disks, flash memories, EEPROMs, CD-ROMs, u.a.m. It is also possible to download a program via computer networks (Internet, intranet, etc.).
  • FIG. 1 shows a functional graph of a schematic time profile of the current consumption
  • FIG. 2 a shows a flow chart for distinguishing extreme points in a time profile of the current consumption
  • FIG. 2b shows a flowchart for determining an overload region on the basis of parameters relating to the extreme points
  • FIG. 3 shows a further functional graph of a schematic time profile of the current consumption, wherein extreme points are distinguished.
  • FIG. 4 shows a measuring graph in which a time profile of the current consumption, the number of extreme points, the number of valid extreme points and the overload range is shown.
  • a functional graph is designated as a whole by 100, which represents a schematic time profile of the current consumption 120.
  • the current consumption I is plotted on an axis 121 against the time t on an axis 122.
  • the time course 120 can be divided into three areas.
  • the current consumption shows a rising course up to a first maximum 110 and then a falling course up to a first minimum 111. This is the start-up range of the motor in which the current consumption first rises sharply before it reaches conventional operating values reached.
  • a second area 102 the course of the current again shows an increasing behavior up to a next maximum 112.
  • This area 102 corresponds to the normal operating range of the parking brake. The stronger the parking brake is applied, the higher the current consumption of the electric motor.
  • a plurality of maxima and minima e.g. 113, 114, each other.
  • This course of current consumption is caused by an active slip clutch and can be detected quickly and reliably by the embodiment of the method according to the invention described below.
  • FIG. 2a shows a flowchart showing how extreme points can be determined in a preferred manner.
  • the method begins in a method step 200 each with a new measured value.
  • a step 201 the first or the next measured value is selected.
  • a method step 202 it is determined whether the selected measured value is an extreme point.
  • all methods known in the prior art for example differential calculus, can be used. It has proven to be particularly simple and reliable, the current difference from the current to the previous measuring point with the current difference from the previous to the previous one To compare measuring point. Current differences with a value of zero are preferably ignored. If these two current differences have different signs, the previous measuring point is an extreme point. In this case, the process proceeds to a step 203, otherwise the process returns to the step 201. From the sign of the current difference, the nature of the extreme point can be determined. The detection of an extreme point is carried out by always the "last direction" is held, so the sign of
  • the method checks whether it is a valid extreme point, i. whether the current difference of the current to the previous extreme exceeds a threshold ⁇ I and whether the nature of the current extreme point differs from the type of the previous extreme point. For this purpose, in a method step 203, the current difference of the current to the previous extreme point is calculated.
  • the method proceeds to a step 204 in which the amount of the calculated current difference is compared with the predetermined threshold value ⁇ I. If the amount is greater than the predetermined threshold, a step 205 is continued, otherwise with a step 206.
  • method step 206 it is checked whether the preceding extreme point is a valid extreme point. If the current extreme point is the first detected extreme point, this check is considered successful. If the previous extreme point is not a valid extreme point, the method returns to step 201. Is it on the other hand? at the last extreme point around a valid extreme point, a branch is made to a method step 207.
  • step 207 an associated entry of the last extreme point in an extreme point table 220 is removed.
  • the extreme points are stored, for example, with their associated parameters current, time and type. It has, for example, three columns 221, 222, 223, which record the said parameters line by line in order, so that the parameters of the current extreme point in the table are arranged to be readable.
  • method step 205 it is determined whether the type (maximum, minimum) of the current extreme point differs from the type of the previous valid extreme point. If it does not differ, the method is continued with method step 201. Are the differences?
  • the types of the two extreme points are branched from one another to a step 208. If it is the first detected extreme point, its current value is used as a current difference and also branches to step 208.
  • method step 208 the parameters of the current extreme point are entered in table 220.
  • the determination of the overload range is carried out, as will be explained in greater detail with reference to FIG. 2B.
  • a method step 210 the number of valid extreme points which have hitherto occurred is compared with a predetermined threshold value nD. If the predetermined number of valid extreme points has not yet been reached, the method returns to step 201 of FIG. 2a.
  • the time interval within which the extreme points have occurred is determined in a method step 211.
  • a method step 212 the time interval is compared with a predetermined threshold value. If the time is greater than the predetermined threshold, no overload is determined and the method continues with step 201 of Figure 2A.
  • the time interval is smaller than the predetermined threshold value, it is determined or signaled in a step 213 that the brake is in an overload range.
  • FIG. 3 shows a further functional graph 300, in which a time profile of the current consumption 303 on an axis I, which is denoted by 302, is plotted against an axis 301 on the time t.
  • the time profile 303 is composed of a number of measuring points 304, 305, 306, etc., each having a current and a time value. As is usual, the measuring points are connected by a connected line, which represents the time profile 303 of the current consumption.
  • a first minimum is designated 304.
  • the area to the left of the minimum 304 represents the starting area of the motor, which is disregarded according to the preferred embodiment. It makes sense to do this by starting the initial range from zero to a first one Maximum (not shown) up to the first minimum 304 not to be considered.
  • each measuring point 305 following the measuring point 304 is examined.
  • the method reaches the measuring point 308, it marks a measuring point 307 as a maximum, since the current difference between the measuring points 308 and 307 has a different sign than the current difference between the measuring points 307 and 306.
  • the amount of current difference between the extreme points 307 and 304 is determined and compared with the predetermined threshold .DELTA.I. Since the current difference in the selected example is greater than the predetermined threshold ⁇ I, the extreme point 307 is characterized as a valid maximum.
  • the other measuring points are characterized in sequence, until finally the measuring point 309 is recognized as an extreme point. Since the current difference of the measuring points 309 and 307 is also greater than the predetermined threshold value .DELTA.I, the measuring point 309 is initially also characterized as a valid minimum.
  • the method is continued until a measuring point 310 is recognized as maximum. Since the current difference between the extreme points 310 and 309 does not reach the predetermined threshold value ⁇ I in the selected example, the extreme point 310 is not characterized as a valid extreme point. In the episode gem. 2a, the preceding extreme point 309 is also withdrawn, ie characterized as invalid, and removed from the table of valid extreme points 220. Furthermore, it is noted that the last extreme point was invalid. In the further implementation of the method, the measuring point 311 is next recognized as a minimum. Since the current difference between the extreme points 311 and 307 (309 and 310 are invalid) is larger than the predetermined one
  • Threshold is ⁇ I, the extreme point 311 is recognized as a valid minimum. This procedure is carried out for all other measuring points.
  • the number of valid extreme points is compared with a predetermined threshold value. If the number is greater than the predetermined threshold value, then the period in which these extreme points have occurred is determined and in turn compared with a predetermined threshold value. If the time duration is less than the predetermined threshold value, an overload range is detected and the electric motor is stopped.
  • an overload range of an electric brake can be determined quickly, easily and safely.
  • FIG. 4 shows a measurement graph 400 in which a time profile of the current consumption 410, the number of extreme points 420, the number of valid extreme points 430 and the determination of the overload region 440 is shown.
  • the time course is plotted against the time t on an axis 401.
  • the motor for starting the brake is started, which is shown by a dashed line 402.
  • the time profile of the current consumption 410 is on an axis for a current consumption I, denoted by 411, the time profile of the number of extreme points 420 on an axis for a numerical value n, denoted 421, the time profile of the number of valid Extreme points 430 on an axis for a numerical value n * denoted 431, and the time course of the determination of the overload region 440 on an axis for the overload region for the values 0 and 1, denoted 441.
  • the value 1 corresponds to a recognized overload range.
  • the time profile of the current consumption 410 in turn first passes through the starting region 101 of the motor.
  • the start-up area is characterized by three extreme points 412, 413 and 414, which increase the number of payers 420 to a value 3 up to a time 422.
  • the attraction region 102 of the electric motor runs. If the maximum 415 is detected, the payer 420 of the detected extreme points increases to the value 4 at a time 423, the payer level 430 of the valid detected extreme points to a value 1 at a time 432. As can be seen in the illustration, the first detected Extreme points up to the time 423 have not been registered as valid extreme points because the start-up area 101 of the motor is disregarded in the preferred embodiment.
  • the extreme point 416 is recognized as a valid minimum, which increases the payload of the detected extreme points 420 to one Time 424 and the Zahlerstand the valid detected extreme points 430 at a time 433 each increased by a numerical value.
  • Detected extreme point which in turn increases the Zahlerstand the detected extreme points 420 at a time 425 and the Zahlerstand the valid detected extreme points 430 at a time 434 each by a numerical value.
  • the following minimum 418 is not recognized as a valid extreme point because of the too low current difference to the maximum 417, for which reason the number of states of the detected extreme points 420 is not increased at this time.
  • the number of the recognized valid extreme points 430 is again reduced by one number at a time 435. It is therefore a retracted extreme point.
  • the subsequent extreme point 419 is again recognized as a valid extreme point, which, as already described in detail, the two Zahlerstande increases again.
  • the predetermined threshold nD which has been set to 5 in this example, is reached for the predetermined time, resulting in detection of an overload region. Therefore, the timing of the determination of the overload area 440 at this time 403 is set to the value 1.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

L'invention concerne un procédé de détermination d'une zone de surcharge (103) d'un frein électrique entraîné par un moteur électrique, notamment d'un frein de stationnement. La zone de surcharge (103) est déterminée à l'aide de la consommation de courant (120) du moteur électrique. L'invention permet de déterminer rapidement, facilement et sûrement une zone de surcharge d'un frein électrique.
PCT/EP2006/069266 2005-12-15 2006-12-04 Procede de determination d'une zone de surcharge d'un frein electrique WO2007068616A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005060022.0 2005-12-15
DE200510060022 DE102005060022A1 (de) 2005-12-15 2005-12-15 Verfahren zur Bestimmung eines Überlastbereichs einer elektrischen Bremse

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Publication Number Publication Date
WO2007068616A1 true WO2007068616A1 (fr) 2007-06-21

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WO (1) WO2007068616A1 (fr)

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
KR101670675B1 (ko) 2015-05-26 2016-10-31 주식회사 만도 전자식 주차 브레이크 시스템 및 그 제어방법
DE102019128741A1 (de) * 2019-10-24 2021-04-29 Zf Active Safety Gmbh Verfahren zur Sensierung einer Bewegung eines Bewegungsteiles einer elektromechanischen Bremse, elektronisch gesteuertes Bremssystem, Computerprogrammprodukt, Steuergerät und Kraftfahrzeug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835353A (en) * 1954-03-23 1958-05-20 Bingham Herbrand Corp Power operated emergency brake
WO1990015743A2 (fr) * 1989-06-20 1990-12-27 Volkswagen Aktiengesellschaft Dispositif d'actionnement du frein de stationnement de vehicules a moteur
US5069000A (en) * 1990-03-22 1991-12-03 Masco Industries, Inc. Reversing apparatus for powered vehicle door systems
US6068352A (en) * 1996-08-20 2000-05-30 Tekonsha Engineering Company Microprocessor-based control for trailer brakes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10152423C2 (de) * 2001-10-24 2003-08-21 Lucas Automotive Gmbh Scheibenbremse
DE10361042B3 (de) * 2003-12-23 2005-05-25 Lucas Automotive Gmbh Feststellbremse und Verfahren zur Steuerung derselben
DE502005011044D1 (de) * 2004-09-01 2011-04-14 Continental Teves Ag & Co Ohg Vorrichtung und verfahren zum betrieb einer elektromechanisch betätigbaren feststellbremse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835353A (en) * 1954-03-23 1958-05-20 Bingham Herbrand Corp Power operated emergency brake
WO1990015743A2 (fr) * 1989-06-20 1990-12-27 Volkswagen Aktiengesellschaft Dispositif d'actionnement du frein de stationnement de vehicules a moteur
US5069000A (en) * 1990-03-22 1991-12-03 Masco Industries, Inc. Reversing apparatus for powered vehicle door systems
US6068352A (en) * 1996-08-20 2000-05-30 Tekonsha Engineering Company Microprocessor-based control for trailer brakes

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