EP2132069A1 - Procédé d'étalonnage de soupapes analogisées dans un dispositif de régulation de pression - Google Patents

Procédé d'étalonnage de soupapes analogisées dans un dispositif de régulation de pression

Info

Publication number
EP2132069A1
EP2132069A1 EP08701657A EP08701657A EP2132069A1 EP 2132069 A1 EP2132069 A1 EP 2132069A1 EP 08701657 A EP08701657 A EP 08701657A EP 08701657 A EP08701657 A EP 08701657A EP 2132069 A1 EP2132069 A1 EP 2132069A1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
calibration
current
coil
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Withdrawn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
EP08701657A
Other languages
German (de)
English (en)
Inventor
Mirco Loos
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and 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 and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP2132069A1 publication Critical patent/EP2132069A1/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Withdrawn legal-status Critical Current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
    • 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/04—Suspension or damping

Definitions

  • the invention relates to a method according to the preamble of claim 1 and to a motor vehicle brake pressure regulating device according to the preamble of claim 16.
  • a / D valves are in principle conventional electromagnetic (solenoid) switching valves, which are controlled by means of a pulse width modulated current (PWM) in such a way that the valve stem assumes a floating position.
  • PWM pulse width modulated current
  • the opening flow is known to the flow of a normally open valve, which is just sufficient, at a certain pressure differential to keep the valve closed.
  • the opening current characteristic current over differential pressure
  • calibration of the regulating A / D valve
  • certain pressure values are specified and pointwise determined flow points, which reflect the opening flow behavior of the valve.
  • a correspondingly obtained curve or support points for this curve can then be stored in the controller of the electronic brake system for later use.
  • the above-described calibration process to be performed individually for each individual valve due to minor manufacturing tolerances to be taken into account requires additional time and makes the production process of the valves produced in large quantities in brake systems overall very complicated.
  • the aim of the invention is to provide a calibration method for determining calibration values, in particular for an opening flow curve, which can be automatically and automatically initiated by the electronic control unit after installation in a motor vehicle, without the use of a pressure sensor or a pressure sensor magnetic / electrical Messeselements takes place.
  • a calibration of an electromagnetic valve is carried out in an electronically controlled pressure control device in which the prevailing at the valve to be calibrated differential pressure periodically modulates and applied to the corresponding valve coil electrical signal to the valve spool or evaluated on an additional measuring coil for calibration.
  • the electrical signal is, in particular, the electrical induction signal and / or the coil current profile and / or the voltage profile at the valve coil or at an additional measuring coil.
  • the valve coil is preferably supplied with an offset current.
  • the offset current is a current from a current source that flows through the valve during the calibration measurement so that it can be opened or closed more easily, for example by hydraulic pressure pulses acting on it. This does not mean, however, that this current must necessarily always remain constant. Rather, it is according to an embodiment of the calibration so that the current is lowered in accordance with a ramp. During a calibration measurement (recording of a measuring point), the current is still sufficiently constant even with a continuous lowering, so that one can speak of a measurement or calibration at constant current. In principle, however, it is also conceivable to carry out a calibration measurement without an offset current as long as the pressure pulsations are sufficient to produce a measurable valve reaction. The latter will rarely be the case.
  • the valve coil current is preferably applied to a (relative to a certain time) by means of a current regulator. point) predetermined setpoint adjusted. Since in general a controller does not show ideal behavior, the coil current adjusted by the regulator is changed by a hydraulically provoked ram motion. For example, if a periodic excitation of the plunger made, then results in a periodic current waveform whose amplitude depends inter alia on the quality of the regulator and the strength of the excitation. In this case, the instantaneous desired value can also be continuously changed according to a curve, which is preferred according to the method. The curve is particularly easy a particularly preferred straight line or ramp.
  • the setpoint value modulated by the valve movement for example the coil voltage
  • the actual value of the controller is evaluated, which is according to the embodiment of the valve coil current.
  • the magnetic flux is measured in the region of the magnetic circuit of the valve coil with known magnetic sensor means.
  • a pick-up coil can be arranged in the magnetic field of the coil.
  • a calibration of the valve is preferably carried out by measuring the opening or closing current.
  • the opening or closing current is in particular the current which flows during a valve movement. This is measured at a differential pressure in the vicinity of 0 bar, in particular at less than 0.5 bar.
  • a measurement at a differential pressure of exactly 0 bar is in principle not possible according to the method according to the invention, since a certain small differential pressure is required to open the valve to be calibrated.
  • valve coil current for detecting the switching point of the valve for example, linear, increased or decreased.
  • the switching point of the valve is determined by a change in the electrical signal measured at the valve.
  • the above-mentioned periodic differential pressure is caused by an acting on the valve, conveying hydraulic pump, which is in particular part of the pressure control device.
  • the escape of the conveying means from the region between the pump and the calibration valve can preferably be made possible by a further open electromagnetic valve connected to this circuit.
  • the valve to be calibrated is concerned around an isolation valve or an intake valve of an electric brake control unit.
  • a component already present in the device for example, valve, check valve, orifice, pressure accumulator, etc. is preferably used. If the amplitude of the differential pressure is increased by this measure, there is advantageously also an increase in the amplitude or amplitude change of the electrical measuring signal evaluated for the calibration.
  • the isolation valve is preferably opened only partially.
  • “partially open” does not mean that the valve is actually open at each pressure. Rather, it is meant that the valve current is selected so that the valve opens at a certain current-dependent differential pressure.
  • the partial opening of the separating valve used for amplification thus takes place, for example, with a valve current, in which the valve opens even at a fairly low differential pressure.
  • the inlet valve can be partially opened in order to increase the differential pressure amplitude.
  • the electric current which is passed through the coil of the respective reinforcing valve for this purpose, has a thickness which corresponds to an opening pressure of preferably about 0.5 to about 8 bar. Particularly preferably, this range is between about 2 to about 4 bar.
  • the calibration is only after installation of the pressure control device in a Nutzanengine, in particular in a Vehicle, without external pressurization automatically made by the device.
  • a Nutzanengine for example, in a motor vehicle.
  • the control device comprises a per se known current control circuit, which in particular allows multi-channel current control.
  • the current control circuit is equipped with a measuring circuit known per se for determining the coil current.
  • the coil current can be measured continuously or averaged and, if necessary, precisely regulated.
  • the current controller used to drive the A / D valve is used quasi "as a sensor".
  • a hydrodynamic in particular via the hydraulic system of the brake system, for example via the pump of the brake system, a pressure modulation is performed in such a way that the A / D valve performs a plunger movement.
  • the differential pressure at the valve is preferably modulated periodically or pulsed with an amplitude which opens the A / D valve.
  • the result of the periodic opening of the valve resulting plunger movement of the controlled valve leads to a reaction to the coil current through the voltage induced in the valve coil.
  • the current regulator then tries to readjust the actual current, which has been changed by the periodic ram movement, to the preset desired current.
  • the valve opening or closing point is preferably determined by evaluating the oscillation signal of the coil current curve.
  • the amplitude of the current curve is considered. If, for example, the valve stem begins to move when the offset current is lowered at a certain time, this can be recognized by a higher amplitude of the valve current. This increase in amplitude normally extends to a certain limited offset current range in which the valve is sensitive to pressure pulsations. In principle, however, the curve can also be evaluated with regard to the frequency or other parameters, provided that a valve movement can still be detected with sufficient accuracy.
  • the offset current flowing at the time of the thus detected valve reaction then corresponds quite accurately to the sought calibration value, which should indicate the opening or closing current at a differential pressure near 0 bar.
  • the method described above describes one way in which the opening or closing flow of a valve can be measured at a differential pressure of close to 0 bar.
  • a corresponding opening or closing current measurement is carried out, which, however, is representative of a differential pressure greater than 0 bar.
  • This is possible, in particular in which the previously described pressure reduction at another valve, which is not calibrated, is withdrawn, so that the pressure in the area between the pump outlet and the calibration valve increases significantly.
  • This differential pressure increase results in the calibration of an inlet valve, for example, when the isolation valve is closed slightly further than in the above-described 0 bar measurement.
  • the invention also relates to an electronically controlled motor vehicle brake pressure control device having at least one ABS control program according to claim 16. This is in particular a control device for a hydraulic pressure.
  • Fig. 1 is a schematic representation of a braking device for ABS and ESP control operations
  • Fig. 2 is a diagram of the time course of the coil current of a valve to be calibrated.
  • tandem master cylinder 5 is connected to hydraulic unit 6 (HCU) of an electronic vehicle brake system.
  • Electronic unit 7 comprises a microprocessor / controllerystem with which the actuators and sensors contained in the valve block can be electronically controlled or measured.
  • Hydraulic unit 6 comprises two brake circuits I and II.
  • each of the brake circuits comprises two wheel pressure circuits (A, B or C, D), each with one inlet 3 or 3 'and one outlet valve 4 or 4'.
  • the electronics of the ECU 7 comprise a multi-channel current regulator, which allows independent regulation of the currents through the coils of the valves 2, 2 '(isolation valves) and the inlet valves 3, 3'.
  • Reference numerals 8 and 8 ' denote normally closed electronic switching valves.
  • In leading to the master cylinder 5 hydraulic line 8 is a Input pressure sensor 9.
  • the illustrated brake system does not include any other pressure sensors in the wheel pressure circuits themselves.
  • pump 1 When carrying out the calibration procedure, pump 1 is switched on to generate pressure pulsations on the valve to be calibrated.
  • the calibration will be described below using the inlet valve 3 as an example.
  • Calibration of other A / D valves, such as the isolation valve 2 can be done analogously.
  • a periodic differential pressure is produced at inlet valve 3, which in the case of a completely closed inlet valve does not necessarily lead to an opening of the inlet valve. Only when the current through the coil of the isolation valve, for example, ramped lowered, resulting in a suitable current range periodic plunger movements.
  • the plunger movements occur especially in the area of the balance of forces between the spring force of the return spring and the magnetic force of the valve spool.
  • the calibration measurement to be carried out here for a differential pressure of 0 bar is conveniently carried out in a state of the hydraulic system in which the pressure in line 12 is also in the range of the atmospheric pressure.
  • the curves in FIG. 2 represent the time profile of the valve coil current of the inlet valve 3.
  • the number of recorded measured values is plotted on the x-axis of the diagram.
  • the x-axis can also be understood as a time axis since the measuring points were recorded at regular, constant intervals.
  • the y-axis represents the current which is measured in the current regulator at the flow channel associated with the inlet valve 3.
  • first pump 1 is switched on and separating valve 2 is acted upon by a current which corresponds to an opening pressure of about 3 bar.
  • the pressure pulsations of pump 1 pass via line 13 to the separating valve 2 and are reflected there.
  • a portion of the pumped by pump 1 hydraulic fluid can equally escape through valve 2, so that the average pressure in line 13 does not increase much above 0 bar (about 0 to 3 bar).
  • the amplified pressure pulsations then reach the side of intake valve 3 facing the pump.
  • valve 3 is first energized with almost the full current and thus substantially completely closed. Since no pressure prevails on the side facing the wheel cylinder, a pulsating pressure difference builds up on valve 3. Now, according to a ramp, the setpoint value for the coil current of valve 3 is reduced. The pressure pulsations are still insufficient to cause the plunger of valve 3 to move. Meanwhile, the current curve of valve 3 within the electronics unit is regularly measured and stored at short, equidistant intervals (n measuring points). The measured current values are plotted in FIG. 2 as curve 15. Since the PWM current regulator oscillates slightly, current pulsations with a comparatively small amplitude of approximately 10 measuring units can be recognized.
  • the offset current (setpoint current) in valve coil 3 is slowly reduced in a ramp.
  • the valve stem of valve 3 is pressurized by the pressure Pulsations is movable, changes the recorded current curve.
  • Curve 16 shows the course of the coil current in the steady state and know an amplitude of over 80 units of measurement. For purposes of illustration, the curve is in the same range of points as curve 15. However, these are current values measured at a later time.
  • the current range of the offset current in which the current curve with increased amplitude can be seen, is used as opening current of the valve at a pressure difference of about 0 bar. The calibration process for valve 3 is completed.
  • the calibration method described above allows a valve calibration in the motor vehicle.
  • a calibration of the valves in the factory or at the motor vehicle manufacturer can be advantageously eliminated. It is particularly expedient if the calibration method described above is carried out in the wake of the brake system after switching off the ignition or while driving in suitable situations.
  • a particularly suitable situation is given in particular when the vehicle is currently executing an acceleration process.
  • the method is configured such that a termination or interruption of the calibration process takes place in the event of an inappropriate driving situation. In these non-suitable driving situations, proper functioning of the brake system has the highest priority.
  • the calibration value which was determined for a pressure difference of 0 bar, can preferably be used to correct an already stored opening flow characteristic for the valve.

Landscapes

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

Abstract

L'invention concerne un procédé selon lequel on entreprend un étalonnage d'une soupape électromagnétique (2, 3) dans un dispositif de régulation de pression. Selon ce procédé, la pression différentielle régnant au niveau de la soupape (2, 3) à étalonner est périodiquement modulée, et le signal électrique appliqué à la bobine de la soupape (2, 3) est évalué sur la bobine de soupape ou sur une bobine de mesure supplémentaire pour l'étalonnage. L'invention concerne en outre un dispositif de régulation de la pression de freinage d'un véhicule automobile à commande électronique, dans lequel le procédé ci-dessus peut être mis en oevre.
EP08701657A 2007-03-05 2008-01-23 Procédé d'étalonnage de soupapes analogisées dans un dispositif de régulation de pression Withdrawn EP2132069A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007010514A DE102007010514A1 (de) 2007-03-05 2007-03-05 Verfahren zur Kalibrierung von analogisierten Ventilen in einer Druckregelvorrichtung
PCT/EP2008/050781 WO2008107219A1 (fr) 2007-03-05 2008-01-23 Procédé d'étalonnage de soupapes analogisées dans un dispositif de régulation de pression

Publications (1)

Publication Number Publication Date
EP2132069A1 true EP2132069A1 (fr) 2009-12-16

Family

ID=39167831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08701657A Withdrawn EP2132069A1 (fr) 2007-03-05 2008-01-23 Procédé d'étalonnage de soupapes analogisées dans un dispositif de régulation de pression

Country Status (7)

Country Link
US (1) US20100090521A1 (fr)
EP (1) EP2132069A1 (fr)
JP (1) JP2010520427A (fr)
KR (1) KR20090116799A (fr)
CN (1) CN101626927A (fr)
DE (1) DE102007010514A1 (fr)
WO (1) WO2008107219A1 (fr)

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DE102008006653A1 (de) * 2008-01-30 2009-08-06 Continental Teves Ag & Co. Ohg Verfahren zur Konditionierung eines Regelventils
DE102009034333B4 (de) 2008-10-17 2021-03-04 Continental Teves Ag & Co. Ohg Verfahren zur Beeinflussung des Drehverhaltens einer Fluid-Pumpe in einem Kraftfahrzeugbremssystem
DE102010003183A1 (de) 2010-03-23 2011-09-29 Continental Teves Ag & Co. Ohg Erkennung und Vermeidung von schwingenden Ventilen
DE102010032929A1 (de) * 2010-07-30 2012-02-02 Lucas Automotive Gmbh Verfahren zum Betreiben eines elektrisch steuerbaren Bremssystems
DE102011005984A1 (de) * 2011-03-23 2012-09-27 Robert Bosch Gmbh Verfahren und System zur Kompensation eines mangelnden Druckaufbaus im Bremssystem eines Fahrzeugs
DE102011075295A1 (de) 2011-05-05 2012-11-08 Continental Teves Ag & Co. Ohg Verfahren zur Kalibrierung eines analog regelnden Hydraulikventils
DE102011086706A1 (de) * 2011-11-21 2013-05-23 Robert Bosch Gmbh Verfahren zum Verblenden eines Generator-Bremsmoments eines Generators eines rekuperativen Bremssystems mit zwei Bremskreisen und Steuervorrichtung für ein rekuperatives Bremssystem mit zwei Bremskreisen
CN103364138B (zh) * 2011-12-23 2015-03-11 合肥工业大学 一种对差压传感器进行压力波动标定的方法
DE102013203599B4 (de) * 2012-03-06 2023-09-28 Continental Automotive Technologies GmbH Verfahren zur Kalibrierung von analog angesteuerten hydraulischen Ventilen und eine Bremsanlage
DE102012215353A1 (de) * 2012-08-29 2014-03-06 Continental Teves Ag & Co. Ohg Schaltumkehrverfahren für ein analogisiert betriebenes Magnetventil, elektrohydraulische Bremsanlage und Verwendung der elektrohydraulischen Bremsanlage
US9112443B2 (en) * 2012-08-30 2015-08-18 Nxp B.V. Current controlled actuator driver with improved accuracy at low current
DE102014222573A1 (de) * 2014-11-05 2016-05-12 Robert Bosch Gmbh Hydraulikeinrichtung einer Fahrzeugbremsanlage
DE102016200118A1 (de) 2016-01-08 2017-07-13 Continental Teves Ag & Co. Ohg Verfahren zur Bestimmung des Öffnungsstromes eines analog angesteuerten Ventils und Druckregelvorrichtung
US11667272B2 (en) * 2019-01-24 2023-06-06 ZF Active Safety US Inc. Vehicle brake system with adaptive pressure calibration
CN111946466B (zh) * 2020-07-06 2022-06-21 江苏大学 一种双燃料发动机甲醇压力调节系统及其控制方法
CN115076440A (zh) * 2022-05-07 2022-09-20 中联重科股份有限公司 用于比例电磁阀的电流标定的方法、处理器及装置

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EP0825942B1 (fr) * 1995-05-18 1999-03-10 LUCAS INDUSTRIES public limited company Dispositif de vanne electromagnetique et systeme de freinage de vehicules pourvus d'un tel dispositif
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JP5142443B2 (ja) * 2000-09-27 2013-02-13 コンティネンタル・テーベス・アクチエンゲゼルシヤフト・ウント・コンパニー・オッフェネ・ハンデルスゲゼルシヤフト 電子制御可能なブレーキ操作システムを制御する方法と制御システム
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EP1478557B1 (fr) * 2002-02-14 2015-01-28 Continental Teves AG & Co. oHG Procede pour regler une pression de freinage donnee variable
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Also Published As

Publication number Publication date
DE102007010514A1 (de) 2008-09-11
CN101626927A (zh) 2010-01-13
US20100090521A1 (en) 2010-04-15
WO2008107219A1 (fr) 2008-09-12
JP2010520427A (ja) 2010-06-10
KR20090116799A (ko) 2009-11-11

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