A TAS sensor torque calibration device for an electro-hydraulic steering gear

Abstract

The utility model relates to the torsion detection field, concretely relates to a TAS sensor torque calibration device for electro-hydraulic steering gear, including torsion wrench testing instrument, first frock, second frock, third frock, standard torque sensor and TAS sensor, the torsion wrench testing instrument is connected with TAS sensor one end through first frock, and the other end of TAS sensor is connected with standard torque sensor through second frock and third frock, wherein TAS sensor is connected with control acquisition unit still, the device structure is simple, can transform the deformation angle signal of torsion bar in its inside to the torque of TAS, then is associated with standard torque value, realizes the quantitative evaluation of the rigidity of torsion bar after assembling, and the reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of torque detection, specifically to a torque calibration device for a TAS sensor used in an electro-hydraulic steering gear. Background Technology

[0002] As the commercial vehicle market continues to develop towards intelligence, the pure hydraulic power steering (HPS) widely used in commercial vehicle steering systems is gradually being replaced by the electro-hydraulic power steering (EHPS). The EHPS mainly consists of a pure hydraulic steering gear, an electric control mechanical part, and a motor controller assembly. The electric control mechanical part is equipped with a torque angle sensor assembly. When the steering wheel is turned while the car is in motion, the torsion bar will deform. At this time, there is a relative angle difference between the upper and lower halves of the torque angle sensor (TAS). The TAS sensor measures the steering wheel torque by detecting this relative angle.

[0003] In practical applications, torsion bar stiffness plays a crucial role in steering feel and handling. If the torsion bar stiffness is too high, the steering wheel will feel noticeably stiff and lack elasticity when turning, making it difficult to operate and affecting the driving experience. On the other hand, if the torsion bar stiffness is too low, the steering wheel will feel too loose and unable to provide timely feedback on the actual road feel, making it difficult to accurately grasp the vehicle's driving status. Therefore, the accuracy of torsion bar stiffness is of paramount importance.

[0004] After the steering gear is assembled in batches, it is necessary to verify the consistency of the torsion bar stiffness. However, once the torsion bar is assembled into the steering gear assembly, it is difficult to test its stiffness independently. Steering gear manufacturers often have to rely on the stiffness coefficient provided by the torsion bar supplier to adjust the performance of the EHPS electro-hydraulic steering gear, which cannot guarantee accuracy.

[0005] In addition, the torque range of the EHPS electro-hydraulic steering motor is usually only ±8Nm, and the control accuracy needs to reach 0.1N. Traditional torque loading calibration equipment is difficult to meet the requirements of precise torque control in such a small range, which further increases the difficulty of debugging and testing. Utility Model Content

[0006] The purpose of this invention is to provide a torque calibration device for a TAS sensor used in an electro-hydraulic steering gear. By testing the angle change corresponding to different torques applied to the TAS sensor, the device converts the angle change into the deformation of the torsion bar itself, and compares it with the deformation stiffness provided by the torsion bar manufacturer to evaluate the consistency of the torsion bar stiffness.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model discloses a torque calibration device for a TAS sensor used in an electro-hydraulic steering gear, comprising a torque wrench calibrator, a first tooling, a second tooling, a third tooling, a standard torque sensor, and a TAS sensor.

[0009] The torque wrench calibrator is connected to one end of the TAS sensor via a first fixture, and the other end of the TAS sensor is connected to a standard torque sensor via a second and a third fixture. The TAS sensor is also connected to a control and acquisition unit.

[0010] As a further improvement, the first tooling is provided with a groove adapted to the torque wrench calibrator, wherein the bottom of the groove is provided with a connection port.

[0011] As a further improvement, the second tooling includes a base and a protrusion, wherein the protrusion is provided in the middle of the base and is hollow, and a plurality of first bolt holes are provided at intervals along the edge of the base.

[0012] As a further improvement, the protrusion is adapted to the input axis of the TAS sensor.

[0013] As a further improvement, the third tooling is provided with a connecting hole in the middle and a second bolt hole at the edge of the third tooling that is adapted to the first bolt hole.

[0014] As a further improvement, the first tooling, the second tooling, the third tooling, the standard torque sensor, and the TAS sensor are all coaxially connected.

[0015] As a further improvement, the control acquisition unit includes a connected EHPS motor controller assembly and a host computer, and the EHPS motor controller assembly is communicatively connected to the TAS sensor via a wiring harness.

[0016] As a further improvement, the control acquisition unit compares the angle data acquired from the TAS sensor with the torque data from the standard torque sensor.

[0017] As a further improvement, an adjustment unit is also included, which is connected to a torque wrench calibrator.

[0018] As a further improvement, the adjustment unit, torque wrench calibrator, first tooling, second tooling, third tooling, standard torque sensor, and TAS sensor are all mounted on a horizontal platform.

[0019] Compared with the prior art, this utility model achieves the following technical effects:

[0020] This device connects the TAS sensor to a standard torque sensor via a first fixture, a second fixture, and a third fixture. It converts the torque applied to the TAS into a deformation angle signal of the internal torsion bar, and then correlates it with the standard torque value to achieve a quantitative assessment of the stiffness of the assembled torsion bar. By using a torque wrench calibrator to provide the input torque, the standard torque sensor monitors the transmitted value and the TAS sensor synchronously outputs the torsion bar deformation angle, avoiding the accuracy loss caused by excessive range in traditional equipment and meeting the control requirements in micro-torque scenarios.

[0021] In addition, this device can quickly achieve the positioning and installation of the wrench calibrator, TAS sensor and standard torque sensor through the first tooling, second tooling and third tooling, making it highly applicable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0023] Figure 2 This is a schematic diagram of the first tooling structure in this embodiment;

[0024] Figure 3 This is a schematic diagram of the second tooling structure in this embodiment;

[0025] Figure 4 This is a schematic diagram of the third tooling structure in this embodiment;

[0026] Figure 5 This is a schematic diagram illustrating the torque variation in this embodiment;

[0027] Figure 6 This is a schematic diagram of the angle change of the TAS sensor in this embodiment.

[0028] Reference numerals: 1. Horizontal platform; 2. Adjustment unit; 3. Standard torque sensor; 4. Third tooling; 4.1. Second bolt hole; 4.2. Connection hole; 5. Second tooling; 5.1. Base; 5.2. Protrusion; 5.3. First bolt hole; 6. TAS sensor; 7. Torque wrench calibrator; 8. First tooling; 8.1. Groove; 8.2. Connection port; 9. Wiring harness; 10. EHPS motor controller assembly. Detailed Implementation

[0029] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0030] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] See Figure 1 This embodiment proposes a torque calibration device for a TAS sensor in an electro-hydraulic steering gear, including a torque wrench calibrator 7, a first fixture 8, a second fixture 5, a third fixture 4, a standard torque sensor 3, and a TAS sensor 6. The torque wrench calibrator 7 is connected to one end of the TAS sensor 6 through the first fixture 8, and the other end of the TAS sensor 6 is connected to the standard torque sensor 3 through the second fixture 5 and the third fixture 4. The TAS sensor 6 is also connected to a control acquisition unit.

[0032] In this embodiment, the entire device is installed on the horizontal platform 1, which can reduce the interference of gravity direction deviation on the detection of TAS sensor 6, thereby improving the detection effect. A torque wrench calibrator 7 is used as the torque input source. One end of the torque wrench calibrator 7 is connected to the matching adjustment unit 2. The torque wrench calibrator 7 is driven by the adjustment unit 2 to apply torque. The torque wrench calibrator 7 and the adjustment unit 2 are existing standard instruments, so their specific structures are not described here.

[0033] In this embodiment, one end of the TAS sensor 6 is connected to the torque wrench calibrator 7 via the first fixture 8, and the other end is connected to the standard torque sensor 3 via the second fixture 5 and the third fixture 4; see also Figure 2 The first tooling 8 structure in this embodiment includes a groove 8.1, wherein the bottom of the groove 8.1 is provided with a connection port 8.2. The groove 8.1 in the first tooling 8 is used to be connected to the output shaft of the torque wrench calibrator 7, and the connection port 8.2 in the middle of the bottom of the groove 8.1 is used to connect to the top of the TAS sensor 6. The positioning of the torque wrench calibrator 7 and the TAS sensor 6 can be quickly achieved by the first tooling 8.

[0034] See Figure 3 In this embodiment, the second tooling 5 includes a base 5.1 and a protrusion 5.2. The base 5.1 has a protrusion 5.2 in the middle, which is hollow. The base 5.1 has a plurality of first bolt holes 5.3 spaced apart on its edge. The diameter of the hollow protrusion 5.2 is clearance-fitted with the output shaft of the TAS sensor 6. The base 5.1 has eight first threaded holes evenly distributed on it. See [reference needed] Figure 4 In this embodiment, the third tooling 4 has a connecting hole 4.2 in the middle, which is interference-fitted with the input shaft of the torque sensor. The edge of the third tooling 4 has a second bolt hole, the position of which corresponds exactly to the position of the first bolt hole 5.3, and a rigid connection is achieved by M6 bolts. During installation, the second tooling 5 and the third tooling 4 are coaxially arranged to ensure installation accuracy.

[0035] See Figure 4In this embodiment, the control and acquisition unit includes an EHPS motor controller assembly 10 and a host computer. The EHPS motor controller assembly 10 is connected to the TAS sensor 6 via a wiring harness 9. The EHPS motor controller assembly 10 is also connected to the host computer, which is preferably a PC. The host computer allows the EHPS motor controller assembly 10 to be configured with parameters and can also acquire the detected data in real time, making it convenient for personnel to plot the data as curves.

[0036] The procedure for using this device is as follows:

[0037] During installation, the entire device is placed on a horizontal platform 14. The input shaft of the TAS sensor 6 is connected to the second fixture 5. The torque wrench calibrator 7 is connected to the top of the TAS sensor 6 through the first fixture 8. The bottom of the TAS sensor 6 is connected to the standard torque sensor 3 through the third fixture 4. The TAS sensor 6 is connected to the EHPS motor controller assembly 10 and the host computer (not shown in the figure) through the wiring harness 9.

[0038] Calibration method: Divide the full-range standard input of TAS sensor 6 into several discontinuities and take the value of each point as the standard input value. First, record the torque zero point and angle zero point in the free state. Then, through the adjustment unit 2, rotate the torque wrench calibrator 7 clockwise (right turn) so that the torque generated by the torque wrench is T14. After the output stabilizes, read and record the angle value A14 collected by TAS sensor 6 through the host computer. Then rotate the torque wrench so that the torque generated is T2. Then read and record the angle value A2 collected by TAS sensor 6 through the host computer. Continue in this manner until the torque Tn is reached and the angle An is recorded. Then rotate counterclockwise from large to small to zero point. After the output stabilizes, record the output value corresponding to each input value. After the clockwise (right turn) calibration is completed, the counterclockwise (left turn) calibration is performed again using the above method.

[0039] List the input and output data in a table or plot a curve to complete the calibration process. Then, convert the curve data into the deformation of the torsion bar itself, compare the deformation of the torsion bar with the strain stiffness provided by the torsion bar manufacturer, and evaluate the consistency of the torsion bar stiffness based on the comparison results.

[0040] See Figure 5 and Figure 6 , Figure 5 The graph obtained using the method of this embodiment illustrates different magnitudes of torque applied to the TAS sensor 6. Figure 6 The graph obtained using the method of this embodiment shows the angle change of the TAS sensor 6 through the change in torque.

[0041] The device provided in this embodiment has the characteristics of strong applicability, simple structure, high reliability and easy implementation. In addition, this device is not only suitable for the calibration of EHPS electro-hydraulic steering system, but also for the TAS torque calibration requirements of EPS pure electric steering system.

[0042] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A torque calibration device for a TAS sensor in an electro-hydraulic steering gear, characterized in that, Includes a torque wrench calibrator, a first tooling, a second tooling, a third tooling, a standard torque sensor, and a TAS sensor; The torque wrench calibrator is connected to one end of the TAS sensor via a first fixture, and the other end of the TAS sensor is connected to a standard torque sensor via a second and a third fixture. The TAS sensor is also connected to a control and acquisition unit.

2. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 1, characterized in that, The first tooling is provided with a groove adapted to the torque wrench calibrator, wherein the bottom of the groove is provided with a connection port.

3. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 1, characterized in that, The second tooling includes a base and a protrusion. The base has a protrusion in the middle, which is hollow. The base has a plurality of first bolt holes spaced apart on its edge.

4. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 3, characterized in that, The protrusion is adapted to the input axis of the TAS sensor.

5. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 1, characterized in that, The third tooling has a connecting hole in the middle and a second bolt hole at the edge that is adapted to the first bolt hole.

6. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 1, characterized in that, The first tooling, the second tooling, the third tooling, the standard torque sensor, and the TAS sensor are all coaxially connected.

7. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 1, characterized in that, The control and acquisition unit includes an EHPS motor controller assembly and a host computer connected together. The EHPS motor controller assembly is connected to the TAS sensor via a wiring harness.

8. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 7, characterized in that, The control acquisition unit compares the angle data acquired from the TAS sensor with the torque data from the standard torque sensor.

9. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 1, characterized in that, It also includes an adjustment unit, which is connected to a torque wrench calibrator.

10. The torque calibration device for a TAS sensor in an electro-hydraulic steering gear according to claim 9, characterized in that, The adjustment unit, torque wrench calibrator, first tooling, second tooling, third tooling, standard torque sensor, and TAS sensor are all mounted on a horizontal platform.

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