WO2022167023A1 - Verfahren zur ansteuerung eines elektrischen magnetventils - Google Patents
Verfahren zur ansteuerung eines elektrischen magnetventils Download PDFInfo
- Publication number
- WO2022167023A1 WO2022167023A1 PCT/DE2021/200230 DE2021200230W WO2022167023A1 WO 2022167023 A1 WO2022167023 A1 WO 2022167023A1 DE 2021200230 W DE2021200230 W DE 2021200230W WO 2022167023 A1 WO2022167023 A1 WO 2022167023A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solenoid valve
- switching means
- connection
- supply voltage
- ground potential
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 7
- 238000009499 grossing Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 230000006399 behavior Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000011045 prefiltration Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
-
- 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
- B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
- B60T8/3655—Continuously controlled electromagnetic valves
- B60T8/366—Valve details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
- H01F2007/185—Monitoring or fail-safe circuits with armature position measurement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F2007/1888—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings using pulse width modulation
Definitions
- Electric solenoid valves have been known for decades and are used in motor vehicles in brake systems and for chassis control, for example for adapting the damper behavior.
- Solenoid valves represent an essentially inductive electrical load, which, as is known, reacts with a corresponding delay to voltage changes and, in particular, has the known lag behavior and induction of a countervoltage even when the supply voltage is switched off.
- the solenoid valve is often used in a highly dynamic working environment, which on the one hand requires the specified position of the solenoid valve to be reached and maintained very quickly, and on the other hand is exposed to significantly fluctuating loads on the working medium controlled by the valve, so that the solenoid valve is exposed to this Changes in the working medium is exposed to constant impulses, which in turn have to be compensated for by the electrical control.
- DE 10 2005 032 085 A1 shows in FIG. 1 a generally suitable circuit arrangement made up of transistors T1 and T2 and diodes D1 and D2 and describes in para Adjustment of the working point.
- the transistor T2 is not used to regulate the operating point and is therefore also not pulse-width modulated.
- DE 10 2005 032 085 A1 teaches as a further development a circuit arrangement according to FIG. 3 with an additional switching means T3 and a further freewheeling diode D3, which, instead of the supply voltage V+, also switches on the on-board voltage source Vbat as an alternative, also on the high side of the inductive load under PWM control becomes.
- US Pat. No. 5,940,262 A also describes a control circuit for an electromagnetic device, e.g. a valve, with the corresponding two switching means and freewheeling diodes, whereby the second switching means 22, which is also arranged at ground potential, i.e. the low side, is switched on and off, but not switched in pulse-width modulated fashion.
- an electromagnetic device e.g. a valve
- the second switching means 22 which is also arranged at ground potential, i.e. the low side, is switched on and off, but not switched in pulse-width modulated fashion.
- the object of the invention is to specify a method for controlling an electric solenoid valve which, on the one hand, can be used to control different operating points in a cost-effective manner and, on the other hand, quickly and yet stably.
- a first connection of the solenoid valve can be connected to the supply voltage in a switchable manner via a first switching means and this first connection of the solenoid valve is also permanently connected to the Ground potential is connected.
- the polarity of this 1 is of course exactly opposite to the supply voltage present when the switching means is closed. Only at This freewheeling diode becomes conductive when the supply voltage of the solenoid valve, which was previously energized via the supply voltage, is switched off and the corresponding reverse voltage induction is applied.
- the second connection of the solenoid valve is switchably connected to ground potential via a second switching means and this second connection of the solenoid valve is permanently connected to the supply voltage via a second freewheeling diode, the polarity of which is of course the opposite of the supply voltage.
- the solenoid valve When the second switching means is closed, the solenoid valve is adjusted in its first working direction to a predetermined position and held there, as is also customary in the prior art by pulse-width-modulated closing of the first switching means.
- the current through the solenoid valve is measured by oversampling, ie at a sampling frequency that is preferably a multiple of the clock frequency of the pulse width modulation.
- smoothing then takes place at least also by averaging or integration, preferably in combination with an additional filter, in particular a low-pass filter.
- additional filter in particular a low-pass filter.
- the combination of, for example, analog filtering with a cut-off frequency adapted to the sampling rate and subsequent additional digital smoothing by averaging or integration proves to be particularly preferred in the present application, as this on the one hand eliminates high-frequency interference from the pulse-width module level control or, for example, from vibrations in the working medium can be compensated, on the other hand the signal behavior is not delayed too much by the filtering.
- the actual position of the solenoid valve is preferably derived indirectly from the current detected by the solenoid valve.
- a corresponding device for controlling an electric solenoid valve with a memory with a corresponding control method and a control unit for carrying out this control method is claimed, since this represents a customary tradable unit.
- the invention is explained in more detail below using exemplary embodiments with reference to the figures.
- the figures each show a solenoid valve 1 with its two connections 1.1 and 1.1
- This load circuit is connected to the 1st connection 1.1 via the 1st switching means HS to the supply voltage U and the freewheeling diode D1, which has the opposite polarity to this supply voltage U and which is permanently and firmly connected to the ground potential from the 1st connection 1.1 of the solenoid valve, in particular no parallel ones Switching means or the like are provided.
- the 2nd freewheeling diode D2 is permanently connected to the supply voltage U, but with opposite polarity to the supply voltage U.
- the 2nd connection 1.2 is switchably connected to the ground potential via the 2nd switching means LS.
- the two switching means HS and LS are shown here in the figures in a sketchy manner as switches, but are of course designed as power transistors in the practical embodiment, with a decisive advantage of this circuit arrangement presented here being that only these 2 switching means are required as switching means in the load circuit shown here and just no 4 switching means, as usual in an H-bridge.
- So-called buck converters are usually used in control units for shock absorbers in order to adjust the current of the solenoid valves.
- the buck converter can adjust voltages approximately in the range between 0V and the supply voltage, usually the battery voltage in vehicles.
- FIG. 1 shows how, when the second switching device LS is closed, the solenoid valve 1 is adjusted in its first working direction to a predetermined position and held there by pulse width modulated closing of the first switching device HS.
- the current shown here in broken lines in FIG. 1 now flows from the supply voltage U via the closed HS through the solenoid valve 1 and via the closed LS.
- a freewheeling circuit is also formed via the freewheeling diode D1, as sketched in FIG. 1 with dots.
- the average voltage across the solenoid valve 1, ie between the connections 1.1 and 1.2, according to the selected PWM ratio reaches only a portion of the supply voltage U, or a correspondingly lower current is established.
- the current and thus ultimately the position of the solenoid valve can be adjusted by regulating the voltage at the solenoid valve. Steep rising edges can be realized with this circuit, while the falling edges would be flat if the induced voltage could not be reduced more quickly via the freewheeling diodes.
- a negative voltage must be applied to the solenoid valve so that the falling edge is also steeper.
- This can be implemented by expanding the circuit, as shown in FIG.
- both switching means HS and LS are first opened, so that the current has to flow through the coil via the power supply and the two freewheeling diodes D1 and D2.
- the voltage from the voltage source thus counteracts the flow of current, which means that the magnetic field of the coil and the current through the coil are reduced more quickly.
- this switch is preferably also PWM-controlled.
- the falling edge not only becomes steeper as a result, but can also be controlled over time.
- the freewheeling circuit shown in dotted lines in Figure 2 can become effective again by closing the second switching means LS and the voltage or the Affect current via solenoid valve 1.
- the control algorithm is thus modified in such a way that the lower limit of the set voltage is extended from 0V to minus 11-Batt and any desired intermediate value can be set via pulse width modulation.
- a special algorithm is used to decide which switching means, in particular power FET, is currently open, closed or clocked with a specific pulse width (PWM).
- PWM pulse width
- Figure 4 now outlines the particularly preferred embodiment of the current measurement, in which the current I (through the solenoid valve 1 - not shown here) by oversampling compared to the clock frequency of the pulse width modulation of the activation of at least one of the switching means and subsequent smoothing at least also by averaging or integration done.
- 4 has a so-called “shunt”, ie the lower resistance 4.1 above, in the load circuit of the solenoid valve 1 and the voltage drop across this is detected by a differential amplifier 4.2.
- a simple Nyquist filter 4.3 that is to say a low-pass filter, is initially connected upstream, which is based on the desired oversampling of the downstream analog/digital converter 4.4.
- the sampling rate of the 4.4. Be greater than those interference frequencies of the PWM that are to be suppressed. This provides complete sampling of the current signal to be measured. With a correspondingly high sampling rate, however, the pre-filter 4.3 can be designed with a very wide bandwidth and react quickly to changes.
- the cut-off frequency of the pre-filter 4.3 only has to be defined according to the Nyquist theorem based on the desired sampling rate of the oversampling.
- a DMA 4.5 and a ring memory 4.6 and subsequent integrator or summation generator 4.7 are provided in this exemplary embodiment, with the mean value of the stream being calculated from the total value divided by the number of sampled values based on the known number of sampled values of the oversampling by the solenoid valve.
- the DC component in the current signal is therefore determined independently of the position of the measurement window.
- the DC component superimposed on the fluctuating current signal can thus be determined within the measurement interval plus the settling time of the Nyqu ist filter.
- this has the further advantage that the length of the measurement interval can be adjusted via software and thus the period duration or frequency of the PWM to be filtered out.
- it is often necessary to configure the PWM frequency customer-specifically, ie different PWM frequencies are used.
- the proposed method it is possible to adapt a current measuring circuit once developed to different PWM frequencies by software configuration.
- the invention presented is preferably used for a solenoid valve of an actively controllable chassis component, in particular an adaptable damper.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112021007011.8T DE112021007011A5 (de) | 2021-02-04 | 2021-12-01 | Verfahren zur Ansteuerung eines elektrischen Magnetventils |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021201015.6 | 2021-02-04 | ||
DE102021201015.6A DE102021201015A1 (de) | 2021-02-04 | 2021-02-04 | Vorrichtung und Verfahren zur Ansteuerung eines elektrischen Magnetventils |
Publications (1)
Publication Number | Publication Date |
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WO2022167023A1 true WO2022167023A1 (de) | 2022-08-11 |
Family
ID=78845077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2021/200230 WO2022167023A1 (de) | 2021-02-04 | 2021-12-01 | Verfahren zur ansteuerung eines elektrischen magnetventils |
Country Status (2)
Country | Link |
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DE (2) | DE102021201015A1 (de) |
WO (1) | WO2022167023A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022111814A1 (de) * | 2022-05-11 | 2023-11-16 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Stromversorgungsschaltung für einen Aktuator eines Magnetventils, Ventilanordnung für ein Bremssystem eines Kraftfahrzeugs, und Verfahren zur Stromversorgung eines Aktuators eines Magnetventils |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5940262A (en) | 1996-09-20 | 1999-08-17 | Lucas Industries Public Limited Company | Control circuit for an electromagnetic device for controlling an electromagnetic fuel control valve |
DE102005032085A1 (de) | 2005-07-08 | 2007-01-18 | Siemens Ag | Vorrichtung zur Leistungsverringerung beim Betrieb einer induktiven Last |
DE102011002544A1 (de) * | 2011-01-12 | 2012-07-12 | Zf Friedrichshafen Ag | Magnetventil sowie Verfahren zum Betreiben des Magnetventils |
EP3524847A1 (de) * | 2018-02-12 | 2019-08-14 | Rausch und Pausch GmbH | Magnetventil und verfahren zur herstellung eines magnetventils |
-
2021
- 2021-02-04 DE DE102021201015.6A patent/DE102021201015A1/de not_active Withdrawn
- 2021-12-01 DE DE112021007011.8T patent/DE112021007011A5/de active Pending
- 2021-12-01 WO PCT/DE2021/200230 patent/WO2022167023A1/de active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5940262A (en) | 1996-09-20 | 1999-08-17 | Lucas Industries Public Limited Company | Control circuit for an electromagnetic device for controlling an electromagnetic fuel control valve |
DE102005032085A1 (de) | 2005-07-08 | 2007-01-18 | Siemens Ag | Vorrichtung zur Leistungsverringerung beim Betrieb einer induktiven Last |
DE102011002544A1 (de) * | 2011-01-12 | 2012-07-12 | Zf Friedrichshafen Ag | Magnetventil sowie Verfahren zum Betreiben des Magnetventils |
EP3524847A1 (de) * | 2018-02-12 | 2019-08-14 | Rausch und Pausch GmbH | Magnetventil und verfahren zur herstellung eines magnetventils |
Also Published As
Publication number | Publication date |
---|---|
DE112021007011A5 (de) | 2023-12-07 |
DE102021201015A1 (de) | 2022-08-04 |
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