WO2018046045A1 - Method for adjusting temperature compensation of a hydraulic clutch system - Google Patents
Method for adjusting temperature compensation of a hydraulic clutch system Download PDFInfo
- Publication number
- WO2018046045A1 WO2018046045A1 PCT/DE2017/100672 DE2017100672W WO2018046045A1 WO 2018046045 A1 WO2018046045 A1 WO 2018046045A1 DE 2017100672 W DE2017100672 W DE 2017100672W WO 2018046045 A1 WO2018046045 A1 WO 2018046045A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature compensation
- ellipse
- clutch
- piston
- determined
- Prior art date
Links
Classifications
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0227—Source of pressure producing the clutch engagement or disengagement action within a circuit; Means for initiating command action in power assisted devices
- F16D2048/0233—Source of pressure producing the clutch engagement or disengagement action within a circuit; Means for initiating command action in power assisted devices by rotary pump actuation
- F16D2048/0251—Electric motor driving a piston, e.g. for actuating the master cylinder
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
- F16D2048/026—The controlling actuation is directly performed by the pressure source, i.e. there is no intermediate valve for controlling flow or pressure
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
- F16D2048/0296—Hydraulic circuits controlled exclusively by hydraulic pressure, i.e. with no electrically controlled valves
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/501—Relating the actuator
- F16D2500/5018—Calibration or recalibration of the actuator
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/502—Relating the clutch
- F16D2500/50236—Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/502—Relating the clutch
- F16D2500/50245—Calibration or recalibration of the clutch touch-point
- F16D2500/50266—Way of detection
- F16D2500/50275—Estimation of the displacement of the clutch touch-point due to the modification of relevant parameters, e.g. temperature, wear
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70402—Actuator parameters
- F16D2500/70406—Pressure
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/706—Strategy of control
- F16D2500/70605—Adaptive correction; Modifying control system parameters, e.g. gains, constants, look-up tables
Definitions
- the invention relates to a method for adapting a temperature compensation of a hydraulic clutch system, in which a clutch is actuated by an electrohydraulic clutch actuator, wherein a piston mounted in a master cylinder is moved axially, which via a pressure medium contained in a hydrostatic path to a clutch actuating slave cylinder acts, wherein an actuating travel of the piston of the master cylinder is changed in response to a change in temperature.
- a method for controlling a clutch actuator for actuating a clutch of a motor vehicle in which the clutch actuator comprises a master cylinder with a piston axially movably mounted therein, which under construction of a pressure in a hydrostatic transmission path having a pressure medium travels a maximum actuation path to open the clutch via a slave cylinder, wherein the piston in the non-actuated state releases a connection opening of the master cylinder to a surge tank for volume compensation of the pressure medium.
- the coupling system is protected from damage, after the volume compensation of the pressure medium, the maximum actuating travel of the piston of the master cylinder in response to a change in temperature, which occurred after the volume compensation has been reduced. If the liquid expands, the compensation actuator moves the clutch actuator in such a way that the expansion is counteracted. Likewise with a contraction of the liquid during a cooling process.
- the invention has for its object to provide a method for adapting a temperature compensation of a hydraulic clutch system, which improves the solution described.
- the stationary clutch actuator in which the piston assumes a predetermined position, is controlled with a periodic test sequence in such a way that a change in position about the predetermined given position of the piston of the master cylinder is produced without influence on a clutch torque, each in a test sequence, a pressure hysteresis via a Aktorweg descriptive ellipse is determined and determined during a temperature compensation ellipse with respect to a deviation with a parallel to the Aktorweg extending horizontal determined without temperature compensation Ellipse is compared, wherein in a deviation of the determined during the temperature compensation ellipse of the horizontal of the determined without temperature compensation ellipse an adaptation of the temperature compensation takes place.
- the advantage of comparing the ellipses is that it is possible to determine whether the temperature compensation was sufficient or whether the temperature compensation had to be adjusted. An adaptation always takes place when the ellipse determined with the temperature compensation fluctuates up and down around the horizontal. Depending on the direction in which the ellipse deflects, the temperature compensation is too weak or too strong, which causes an incorrect correction of the Aktorweges. This is compensated by the subsequent adaptation.
- the test sequence is designed as a rectangular signal or as a trapezoidal signal or as a sinusoidal signal, wherein the selected waveform of the test sequence remains unchanged over the periods of the test sequence at a constant amplitude.
- the smaller actuator path required for the temperature compensation to be compensated by the temperature compensation is further reduced.
- the displacement of the ellipse below the horizontal indicates a lower pressure level, which means that there is more fluid in the system than expected. Therefore, the already smaller correction path of the actuator must be further reduced to compensate for the small pressure.
- the larger actuator path required by the temperature compensation for the adaptation of the temperature compensation is further increased. If the ellipse moves to a higher pressure level, this means that there is less liquid in the coupling system than expected, so that the temperature compensation sator required greater actuator travel must be further increased to compensate for the higher pressure.
- the ellipses are compared with respect to a respective center. This is particularly advantageous because it must be assumed that existing boundary conditions between the test sequences can cause a rotation of the ellipse.
- the temperature compensation is determined from an estimated temperature of the pressure medium and a fluid expansion of the pressure medium is corrected as a function of a temperature difference since the last volume compensation. From this the compensation of the actuator travel on the slave cylinder can be reliably adjusted.
- the temperature compensation is limited by an upper and a lower pressure limit. Due to this limitation, other malfunctions that are outside the pressure limits can be checked by the same method.
- a leakage is detected if the upper or lower pressure limit is exceeded or fallen below by a predetermined pressure value difference.
- the adaptation of the temperature compensation takes place in an open position of the unactuated closed clutch. This ensures that additional movement of the clutch actuator is not noticeable in the vehicle.
- 3 shows an embodiment of a pressure curve
- 4 shows an embodiment for a parameterization of an ellipse of the pressure curve
- Fig. 5 shows an embodiment of the method according to the invention.
- a schematic construction of a hydraulic coupling system 1 for use in a motor vehicle is shown.
- the clutch system 1 comprises on the encoder side 2, the control unit 3, which controls an electric motor 4, which in turn drives a spindle gear 5 for converting the rotational movement of the electric motor 4 in a translational movement of the piston 6, which is mounted within the master cylinder 7.
- the electric motor 4, the piston 6 and the master cylinder 7 form the hydrostatic clutch actuator 17th
- the master cylinder 7, the hydraulic line 9 and the slave cylinder 1 1 thereby form the hydrostatic path.
- the pressure p in the hydrostatic section is measured by a pressure sensor 14, which is positioned on the master cylinder 7.
- the change in position is detected via a displacement sensor 13 on the master cylinder 7.
- the master cylinder 7 is connected to a surge tank 15, wherein a connection opening 16 of the master cylinder 7 is released by the piston 6 of the master cylinder 7 when the piston 6 is in a predetermined position.
- the piston 6 reaches this position by this is moved from the position shown to the left.
- the pressure medium 8 is usually unconfirmed and the pressure p in the master cylinder 7 minimal.
- This process is also called sniffing and the position of the piston 6, in which the connection opening 16 is released, is referred to as a sniffer position.
- FIG. 3 shows an exemplary embodiment of a pressure curve during the movement of the piston 6 in the master cylinder 7.
- the pressure p in the hydrostatic section is plotted against the position of the piston 6.
- the reciprocating motion of the clutch actuator 17 generates a pressure hysteresis, which is considered below as an ellipse, which is characterized by a minimum pressure and a maximum pressure.
- a test sequence consisting of several periods is applied to the electric motor 4 when the clutch actuator is stationary in an open position of the clutch 12.
- This test sequence which is output by the electric motor 4, can be output as a rectangular signal, as a trapezoidal signal or as a sinusoidal signal with a respectively constant amplitude.
- the test sequence acting on the piston 6 causes the piston 6 to move by a predetermined target position x (FIG. 2). Due to the constant amplitude of the piston 6 moves to its desired position x with a change in position ⁇ , - ⁇ .
- the triggered by the test sequence change in position of the piston 6 is to be chosen so low that it has no effect on the clutch torque of the clutch 12, which means that the actuated open clutch 12 transmits no clutch torque even when applying the test sequence.
- the test sequence consists of several periods, over these periods, the shape of the excitation signal as well as its amplitude remains unchanged. Due to these constant boundary conditions, the ellipse can be parameterized.
- the ellipsis parameters include a minimum pressure value, a maximum pressure value, a minimum position, a maximum position, and a center point. These parameters of the ellipse are shown schematically in FIG. In order to better parameterize the ellipse, the measured pressure signal and the measured position signal are smoothed by filtering. Since it is possible that the boundary conditions existing between the test sequences cause a rotation of the ellipse, an evaluation of the center of the ellipse is given priority over the minimum and maximum pressure. FIG.
- FIG. 5 shows a pressure-path characteristic in which several ellipses measured during the test cycle are shown.
- the ellipse E1 was determined without temperature compensation immediately after a snooping process.
- the ellipses E2, E3, E4 and E5 were recorded during a test cycle in which the temperature compensation was active.
- a horizontal line is laid through the center of the ellipse E1, which runs parallel to the actuator path.
- the position of the ellipses E2, E3, E4, E5 in the pressure direction should not change with a proper compensation of the temperature expansion upon heating of the pressure medium 8 or a temperature compression on cooling of the pressure medium 8 with respect to the ellipse E1. This is the case with the ellipses E2 and E4, since their centers remain on the horizontal.
- the ellipses E2, E4 can definitely travel in the direction of the path axis since the current position of the clutch actuator 17 changes as a function of the compensation value.
- the ellipses E3 and E5 move up and down in the printing direction with respect to the horizontal, which is an indication that the compensation of the temperature expansion is too weak or too strong. If the ellipse moves to a higher pressure level (ellipse E3), this indicates that there is less pressure medium 8 in the coupling system 1 than assumed.
- the temperature compensation is therefore adapted so that the actually provided by the temperature compensation longer path of the clutch actuator 17 is further increased to compensate for the higher pressure.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112017004523.1T DE112017004523A5 (en) | 2016-09-09 | 2017-08-09 | Method for adapting a temperature compensation of a hydraulic clutch system |
KR1020197006583A KR20190045203A (en) | 2016-09-09 | 2017-08-09 | Method for adjusting the temperature compensation of a hydraulic clutch system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016217207.7A DE102016217207A1 (en) | 2016-09-09 | 2016-09-09 | Method for adapting a temperature compensation of a hydraulic clutch system |
DE102016217207.7 | 2016-09-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018046045A1 true WO2018046045A1 (en) | 2018-03-15 |
Family
ID=59683357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2017/100672 WO2018046045A1 (en) | 2016-09-09 | 2017-08-09 | Method for adjusting temperature compensation of a hydraulic clutch system |
Country Status (3)
Country | Link |
---|---|
KR (1) | KR20190045203A (en) |
DE (2) | DE102016217207A1 (en) |
WO (1) | WO2018046045A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19857707A1 (en) * | 1997-12-23 | 1999-06-24 | Luk Getriebe Systeme Gmbh | Clutch for vehicle transmission |
EP1632689A2 (en) * | 2004-09-03 | 2006-03-08 | LuK Lamellen und Kupplungsbau Beteiligungs KG | Method for clutch control, specially for parallel shifting transmission with wet clutch or double wet clutch |
WO2014012541A1 (en) * | 2012-07-17 | 2014-01-23 | Schaeffler Technologies AG & Co. KG | Method for determining parameters of a friction clutch device |
DE102014219029A1 (en) | 2014-09-22 | 2016-03-24 | Schaeffler Technologies AG & Co. KG | Method and device for controlling a clutch actuator for actuating a clutch, preferably a non-actuated closed clutch for a motor vehicle |
DE102015200981A1 (en) * | 2015-01-22 | 2016-07-28 | Schaeffler Technologies AG & Co. KG | Method for controlling a mechanical power transmitted by a friction clutch device |
-
2016
- 2016-09-09 DE DE102016217207.7A patent/DE102016217207A1/en not_active Withdrawn
-
2017
- 2017-08-09 DE DE112017004523.1T patent/DE112017004523A5/en active Pending
- 2017-08-09 KR KR1020197006583A patent/KR20190045203A/en not_active Application Discontinuation
- 2017-08-09 WO PCT/DE2017/100672 patent/WO2018046045A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19857707A1 (en) * | 1997-12-23 | 1999-06-24 | Luk Getriebe Systeme Gmbh | Clutch for vehicle transmission |
EP1632689A2 (en) * | 2004-09-03 | 2006-03-08 | LuK Lamellen und Kupplungsbau Beteiligungs KG | Method for clutch control, specially for parallel shifting transmission with wet clutch or double wet clutch |
WO2014012541A1 (en) * | 2012-07-17 | 2014-01-23 | Schaeffler Technologies AG & Co. KG | Method for determining parameters of a friction clutch device |
DE102014219029A1 (en) | 2014-09-22 | 2016-03-24 | Schaeffler Technologies AG & Co. KG | Method and device for controlling a clutch actuator for actuating a clutch, preferably a non-actuated closed clutch for a motor vehicle |
DE102015200981A1 (en) * | 2015-01-22 | 2016-07-28 | Schaeffler Technologies AG & Co. KG | Method for controlling a mechanical power transmitted by a friction clutch device |
Also Published As
Publication number | Publication date |
---|---|
KR20190045203A (en) | 2019-05-02 |
DE112017004523A5 (en) | 2019-05-23 |
DE102016217207A1 (en) | 2018-03-15 |
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