CN107121054B - Device for simulating forces on a vehicle actuating element - Google Patents
Device for simulating forces on a vehicle actuating element Download PDFInfo
- Publication number
- CN107121054B CN107121054B CN201710096452.8A CN201710096452A CN107121054B CN 107121054 B CN107121054 B CN 107121054B CN 201710096452 A CN201710096452 A CN 201710096452A CN 107121054 B CN107121054 B CN 107121054B
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- housing
- measuring unit
- moving element
- sensor
- stroke measuring
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
- G05G5/03—Means for enhancing the operator's awareness of arrival of the controlling member at a command or datum position; Providing feel, e.g. means for creating a counterforce
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/30—Controlling members actuated by foot
- G05G1/38—Controlling members actuated by foot comprising means to continuously detect pedal position
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/30—Controlling members actuated by foot
- G05G1/44—Controlling members actuated by foot pivoting
Abstract
The invention relates to a device for force simulation on an actuating element of a vehicle, preferably an accelerator pedal force simulator, which provides tactile feedback about a defined force/travel characteristic, wherein a moving element mounted axially movably in a housing is connected to the actuating element. The device for accurately determining the position of a moving element in a pedal force simulator also comprises an integrated travel measuring unit for determining the position of the moving element, which travel measuring unit comprises a sensor positioned on the housing inside or outside the housing, wherein a target operatively connected to the sensor is fixed on the moving element.
Description
Technical Field
The invention relates to a device for force simulation on an actuating element of a vehicle, preferably on a pedal force simulator, which provides tactile feedback about a defined force/travel characteristic, wherein a moving element, which is mounted axially movably in a housing, is connected to the actuating element.
Background
In clutch systems relating to the clutch-by-wire principle, the clutch is actuated by an electric motor, which in some cases is regulated by a clutch pedal actuated by the driver. However, the driver should feel the same force-stroke course on the pedal when engaging and disengaging the clutch, as is felt in conventional disengaging systems. Information about the actuating travel of the pedal or pedal force simulator is required for actuating the electric motor. In this case, the master cylinder of a conventional release system should be replaced by a component which generates the same force/stroke course acting on the clutch pedal as in a conventional release system. In particular, in the hydraulic actuating cylinder of a conventional separating system, the working stroke of the piston of the separating system is measured in the pressure chamber. Here, one target is located on the piston and the sensor is located outside the pressure chamber. Such a stroke measurement is not possible because the pedal force simulator has no pressure chamber.
Disclosure of Invention
The object on which the invention is based is to specify a device for force simulation on an actuating element of a vehicle, in which actuating element a reliable travel measurement of a moving element of the device is generated.
According to the invention, this object is achieved in that an integrated stroke measuring unit for determining the position of a moving element is provided, which stroke measuring unit comprises a sensor which is positioned inside the housing or is fixed to the housing outside the housing, wherein a target which is operatively connected to the sensor is fixed to the moving element. This has the advantage that fewer individual components are required and a smaller tolerance chain arises when the stroke measuring unit is integrated into the pedal force simulator.
In one variant, the stroke measuring unit is designed as a resistive stroke measuring unit. Such a resistive travel measuring unit can be arranged particularly simply and cost-effectively on a device for force simulation and at the same time is durable, which is therefore suitable for use in a vehicle.
In one embodiment, the resistive path-measuring unit is designed as a potentiometer, wherein a sensor designed as a resistive element is mounted on the housing inner wall, wherein the resistive element can be connected at its two ends to a voltage source, and an electrical sliding contact is arranged as a target on the moving element, wherein the electrical sliding contact is in mechanical contact with the resistive element. Since such potentiometers are partial voltage meters, the voltage output by the potentiometer is suitable as a characteristic for the stroke traveled by the moving element.
Alternatively, instead of potentiometers, solutions as incremental stroke receivers with gray code can also be used.
In one variant, the travel measuring unit is designed as an inductive travel measuring unit. Since, in the case of such an inductive travel measuring unit, mechanical contact during travel measurement is eliminated, the inductive travel measuring unit is a particularly insensitive device for determining the position of the moving element.
In one embodiment, the inductive stroke measuring unit is designed as a dip core coil, which comprises a coil, which extends along the inner wall of the housing and is fastened to this inner wall, and a ferromagnetic core, which is positioned as a target on one end side of the moving element, wherein the coil is connected with both ends to a voltage source. Such a submerged core coil is very durable and allows reliable stroke measurements.
In an alternative, the inductive stroke measuring unit is designed as a differential transformer or as an eddy current sensor.
Advantageously, the coils of the differential transformer are cast into or encapsulated by a housing, wherein the coils are directly contacted for feeding and evaluation on the evaluation electronics.
In the case of an eddy current sensor, the conductor is fixed to the moving element. By means of the high-frequency magnetic field generated in the sensor, eddy currents are generated by the moving element when it is moved. The change in impedance produced by the eddy currents is used as a measure of the position of the moving element. Since a contactless measurement method is used here, which detects only conductive materials, this measurement method is insensitive to contamination and can therefore be used reliably.
In a further alternative, the stroke measuring unit is designed as a magnetostatic stroke measuring unit. The measuring method also works in a contactless manner and thus allows wear-free travel measurement.
In one variant, a permanent magnet is arranged as a target on the moving element, said permanent magnet being in operative connection with a hall sensor positioned on the inner or outer wall of the housing. Since the hall sensor can be produced in large numbers, a particularly cost-effective embodiment is provided here.
In one embodiment, the hall sensor is implemented either on a circuit board or as a lead frame IC.
In one embodiment, the sensor is integrated into the housing or is fixed in a separate measuring unit housing located on the outside of the housing. If the travel measuring unit is a separate measuring unit housing which is fixed on the outside of the housing of the device for force simulation, standard solutions which are present in themselves can be used for different devices for force simulation by means of these additional sensors, which can be arranged simply during assembly. In particular, the tolerance chain is reduced in the case of additional sensors, in which case the target is fixed on the moving element, and the target can be easily replaced in the case of maintenance service.
In a further embodiment, the hall sensor is positioned in a lead frame assembly which is integrated on the housing or is arranged on the circuit board together with the sensor electronics in the measuring cell housing. Both variants can be embodied as additional sensors or can be integrated into the housing of the device for force simulation. In particular, when the hall sensor is positioned on the housing outer wall and is therefore used as an additional solution, a simple handling can be achieved when assembling the sensor.
In one variant, the travel measuring unit is designed as an optical or capacitive travel measuring unit.
In an alternative, in order to convert the linear movement of the moving element, a toothed rack as target is arranged on the moving element, with which toothed rack a toothed wheel is engaged which executes a rotational movement as a function of the linear movement, which rotational movement is detected by a contactless rotation sensor arranged in or on the housing. The resolution and accuracy of the sensor can be improved in this variant, if necessary, by means of the possible transmission ratios.
Drawings
The invention allows for a variety of embodiments. Many of these embodiments should be further explained in light of the figures shown in the accompanying drawings.
The figures show:
figure 1 is a schematic diagram of a by-wire clutch system for a vehicle,
figure 2 an embodiment of a pedal force simulator with a resistive stroke measuring unit,
figure 3 shows an embodiment of the pedal force simulator with an inductive stroke measuring unit,
figure 4 shows an embodiment of the pedal force simulator with a magnetostatic stroke measuring unit,
figure 5 an embodiment of a pedal force simulator with an eddy current sensor,
figure 6 is a further embodiment of a pedal force simulator with an eddy current sensor,
figure 7 an embodiment of the pedal force simulator with an optical stroke measuring unit,
figure 8 shows another embodiment of the pedal force simulator with an optical travel measuring unit,
figure 9 an embodiment of the pedal force simulator with a translation-rotation-stroke measuring unit,
figure 10 shows an embodiment of the pedal force simulator according to the invention with a stroke measuring unit as an additional sensor,
figure 11 shows another embodiment of the pedal force simulator with a stroke measuring unit as an additional sensor,
Detailed Description
Fig. 1 shows a schematic diagram of a Clutch System 1, in which a Clutch 2 is actuated by a Clutch-by-Wire System (Clutch-by-Wire System). In such a system, an accelerator pedal 3 to be actuated by the driver is connected to a pedal force simulator 4, on which a sensor 5 is arranged, which transmits the movement of the pedal force simulator 4 to a control unit of an electric motor 6. In this case, the electric motor 6 actuates the clutch 2 via a hydraulic path 7, for example, as a function of the stroke change measured by the sensor 5.
Fig. 2 shows an exemplary embodiment for a pedal force simulator 4, which is a device for force simulation on an accelerator pedal 3 and is designed with a resistive travel measuring unit 8. The pedal force simulator 4 comprises a housing 9 in which a displacement element 10 is mounted so as to be axially movable and which is connected to a piston rod 11 via a connecting element, not shown in detail. In the housing 9, a moving element 10, which may be a piston, for example, is surrounded by a plurality of helical springs 12. These helical springs 12 rest against the housing base 13 and are pressed or released when the moving element 10 is actuated. The housing 9 has a projection 14 on the end facing the helical spring 12, in which the potentiometer is seated. The potentiometer is a resistance element 15 which extends on the wall of a bottom slot 16 inside the housing 9 and the two ends 17, 18 of which are led out of the housing 9 and connected to a control and evaluation unit, not shown in detail, such as a control unit or a local microcontroller. An electrical sliding contact 19 is fastened to the end face of the moving element 10 that fits into the bottom recess 16, said electrical sliding contact mechanically contacting the resistive element 15 as a function of the position of the moving element 10, as a result of which a partial voltage is generated, and the voltage tapped by the control device at the resistive element 15 is evaluated as a measure for the position of the moving element 10.
In fig. 3, an alternative is shown, in which a dip core coil 20 is arranged instead of a potentiometer. In this inductive measuring method, the coil 21 extends along the inner wall of the bottom slot 16 of the housing 9 and is connected to the control and evaluation unit by means of two ends 22, 23, which are also outside the housing 9. On the end face of the moving element 10, an axially extending ferromagnetic core 24 is arranged, which is immersed in the coil 21 or pulled back therefrom when the position is changed. Since the magnetic field changes due to the immersion of the ferromagnetic core 24 and the voltage on the coil 21 therefore also changes, the voltage is also evaluated here as a measure for the position of the mobile unit 10. The immersed core coil is preferably implemented differentially in order to compensate for measurement inaccuracies.
Fig. 4 shows a static magnetic stroke measuring unit 25 of the pedal force simulator 4. Here, a permanent magnet 26, which has a north-south orientation in the axial direction and is configured as a target, is arranged on the end side of the moving element 10. When the moving element 10 moves, the permanent magnet 26 passes by a hall sensor 27, which detects the magnetic field and thus the position of the moving element and outputs this position to the control unit.
Fig. 5 shows a further exemplary embodiment of pedal force simulator 4, in which the travel measuring unit is designed as an eddy current sensor. On the end side of the moving element 10, the electrically conductive material 28 is arranged as a target in which eddy currents are generated by a high-frequency magnetic field generated by an eddy current sensor 29, wherein an impedance change is caused in the eddy current sensor depending on the distance from the eddy current sensor 29 arranged on the end of the housing 9 of the pedal force simulator 4. The eddy current resistance on the coil varies according to the different axial spacing between the target and the eddy current sensor 29 and is therefore a measure for the position of the moving element 10.
In an alternative shown in fig. 6, the permanent magnet 30 arranged on the end face of the moving element 10 is configured in the form of a wedge in the longitudinal extension of the pedal force simulator 4. The eddy-current sensor 29 is arranged here on the longitudinal side of the bottom slot 16 of the housing 9. When the moving element 10 moves, the radial distance between the wedge-shaped permanent magnet 30 and the fixedly mounted eddy current sensor 29 changes, as a result of which an impedance change also occurs in the coil of the eddy current sensor 29 and corresponding stroke information is output as a result of the radial distance between the wedge-shaped permanent magnet 30 and the eddy current sensor 29.
In fig. 7 and 8, the pedal force simulator 4 is configured with an optical stroke measuring unit. The optical path measuring unit comprises a transmitting/receiving unit 31 which transmits optical signals and is arranged on the housing bottom 13 according to fig. 7. The target positioned on the end face of the moving member 10 is configured to send the light emitted by the transmitting/receiving unit 31 back to the reflector 32 of the transmitting/receiving unit. The transmission/reception unit 31 comprises evaluation electronics, not shown in detail, which carry out the transit time measurement of the optical signals and from which the real-time position of the mobile element 10 is deduced.
In contrast to fig. 7, in fig. 8, the reflector 33 arranged on the end face of the moving element 10 is designed in a wedge-shaped manner in the axial extension of the pedal force simulator 4, wherein the transmitter/receiver unit 31 is located on the outer longitudinal side on the bottom slot 16 of the housing 9. In this arrangement, the radial spacing between the transmit/receive unit 31 and the reflector 33 may vary. The resulting optical signal transit time difference is used as a measure for the position of the moving element 10.
Fig. 9 shows an exemplary embodiment of a pedal force simulator 4 with a measuring unit, in which the linear movement of the displacement element 10 is converted into a rotational movement. A toothed rack 34 is arranged in the axial direction on the end face of the moving element 10, by means of which toothed wheel 36 mounted on a shaft 35 is set in rotational motion during the movement of the moving element 10. This rotary movement is detected by a contactless rotary sensor 37 which operates according to a magnetic or inductive measuring principle, wherein the number of increments of the gear wheel which are traversed in the rotary movement is a measure for the position of the moving element 10.
The solution shown in the exemplary embodiment can be used not only as a solution integrated in the housing 9 of the pedal force simulator 4, but also as a so-called additional sensor, such as the one illustrated in fig. 10 and 11 by way of example by the magnetostatic travel measuring unit 25. Even in the presence of these additional sensors, the permanent magnet 26 is in any case arranged on the end side of the moving element 10. The hall sensor 27 is located on a circuit board 39 together with the sensor electronics 38, which are located outside the housing 9 in a sensor housing with a lead frame on the housing 9, which at the same time comprises an outwardly protruding plug 40. The sensor housing is arranged parallel to the bottom slot 16 of the housing 9, in which the permanent magnet 26 moves.
In the alternative shown in fig. 11, the additional sensor is arranged outside the housing 9 on the housing bottom 13 of the housing 9 of the pedal force simulator 4 and comprises a movement chamber 41 for the permanent magnet 26. In this case, the end face of the displacement element 10 is guided out through the housing base 13 of the housing 9 of the pedal force simulator 4 and moves the permanent magnet 26 in a movement chamber 41 extending parallel to the hall sensor 27. The permanent magnet 26 is therefore located outside the pedal force simulator 4 and is prestressed by a helical spring 42, which, in the absence of a movement, returns the moving element 10 into the initial position. The movement chamber 41 together with the hall sensor forms a separate measuring unit housing 43, which can be easily assembled as an additional sensor.
List of reference numerals
1 Clutch System
2 Clutch
3 Accelerator pedal
4 pedal force simulator
5 sensor
6 electric motor
7 hydraulic road section
8 resistance type stroke measuring unit
9 casing
10 moving element
11 piston rod
12 helical spring
13 bottom of the shell
14 projection
15 resistance element
16 bottom notch
17 resistive element end
18 ends of resistive element
19 sliding contact part
20 immersed core coil
21 coil
22 coil end
23 coil end
24 ferromagnetic core
25 magnetostatic stroke measuring unit
26 permanent magnet
27 Hall sensor
28 conductive material
29 eddy current sensor
30 permanent magnet
31 transmitting/receiving unit
32 reflector
33 Reflector
34 rack
35 shaft
36 gear
37 rotation sensor
38 sensor electronics
39 circuit board
40 plug
41 motion cavity
42 helical spring
43 measuring cell housing
Claims (10)
1. Device for force simulation on an actuating element of a vehicle, which is an accelerator pedal force simulator, which provides tactile feedback about a defined force/travel characteristic, wherein a moving element (10) which is mounted axially movably in a housing (9) is connected to the actuating element (3),
one end of the moving element (10) protrudes into a bottom slot (16) of the housing (9) or into a cavity (41) attached to the housing (9),
an integrated travel measurement unit (8, 20, 25) for determining the position of the moving element (10) is also provided, said travel measurement unit comprising a sensor (15, 21, 27, 29, 31) which is positioned inside the housing (9) or outside the housing, wherein a target (19, 24, 26, 30, 32, 33) which is operatively connected to the sensor (17, 21, 27, 29, 31) is fixed on the moving element (10);
the target (19, 24, 26, 30, 32, 33) is fixed on the one end of the moving element (10), and the target (19, 24, 26, 30, 32, 33) is located in the bottom notch or in the cavity.
2. The device according to claim 1, characterized in that the stroke measuring unit is configured as a resistive stroke measuring unit (8).
3. Device according to claim 2, characterized in that the resistive stroke measuring unit (8) is configured as a potentiometer, wherein a sensor configured as a resistive element (15) is mounted on an inner wall of the housing (9), wherein the resistive element (15) can be connected to a voltage source on both ends (17, 18) of the resistive element, and an electrical sliding contact (19) as a target is arranged on the moving element (10), which electrical sliding contact is in mechanical contact with the resistive element (15).
4. The device according to claim 3, characterized in that the stroke measuring unit is configured as an inductive stroke measuring unit (20).
5. The device according to claim 4, characterized in that the inductive stroke measuring unit (20) is configured as a sunk core coil comprising a coil (21) which extends along and is fixed on the inner wall of the housing (9) and a ferromagnetic core (24) which is positioned as a target on one end side of the moving element (10), wherein the coil (21) is connected with a manipulation and evaluation unit by means of two ends (22, 23).
6. Device according to claim 4, characterized in that the inductive stroke measuring unit is configured as a differential transformer or as an eddy current sensor (29).
7. The device according to claim 4, characterized in that the inductive stroke measuring unit is configured as a magnetostatic stroke measuring unit (25).
8. Device according to claim 7, characterized in that a permanent magnet (26) as target is arranged on the moving element (10), which permanent magnet is in operative connection with a Hall sensor (27) positioned on the inner or outer wall of the housing (9).
9. Device according to any of the preceding claims, characterized in that the sensor (15, 21, 27, 29, 31) is integrated into the housing (9) or is fixed in a separate measuring unit housing (43) located on the housing (9) outside it.
10. The device according to claim 1, characterized in that the travel measurement unit is configured as an optical or capacitive travel measurement unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016202721.2 | 2016-02-23 | ||
| DE102016202721 | 2016-02-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107121054A CN107121054A (en) | 2017-09-01 |
| CN107121054B true CN107121054B (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710096452.8A Active CN107121054B (en) | 2016-02-23 | 2017-02-22 | Device for simulating forces on a vehicle actuating element |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107121054B (en) |
| DE (1) | DE102017102418A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017215387A1 (en) * | 2017-09-01 | 2019-03-07 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Position determination of an actuating element |
| CN107784891B (en) * | 2017-12-13 | 2023-07-11 | 吉林大学 | Steering feel simulation and rotation angle measurement device for simulation driving system |
| CN109613938A (en) * | 2019-01-10 | 2019-04-12 | 南京感控通化工产品经营部 | A kind of personal control multistage speed adjusting method |
| CN109849882B (en) * | 2019-03-06 | 2021-08-06 | 上海擎度汽车科技有限公司 | Force simulator |
| CN113090472B (en) * | 2019-12-23 | 2023-02-28 | 新疆金风科技股份有限公司 | Displacement sensor, method for monitoring bolt looseness of tower barrel and wind generating set |
| DE102020117448A1 (en) | 2020-07-02 | 2022-01-05 | Schaeffler Technologies AG & Co. KG | Sensor arrangement for position detection and a coupling system with the sensor arrangement |
| WO2023210601A1 (en) * | 2022-04-29 | 2023-11-02 | 株式会社デンソー | Pedal device |
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- 2017-02-22 CN CN201710096452.8A patent/CN107121054B/en active Active
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| CN104245448A (en) * | 2012-02-14 | 2014-12-24 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Main brake cylinder having a device for the contactless monitoring of the position and movement of a linearly movable piston |
| CN105221828A (en) * | 2014-06-27 | 2016-01-06 | 比尔克特韦尔克有限公司 | Comprise the valve of tappet and sensor |
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Also Published As
| Publication number | Publication date |
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| CN107121054A (en) | 2017-09-01 |
| DE102017102418A1 (en) | 2017-08-24 |
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