CN114136519A - Automobile half-axle dynamic torque testing system - Google Patents
Automobile half-axle dynamic torque testing system Download PDFInfo
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- CN114136519A CN114136519A CN202111475234.8A CN202111475234A CN114136519A CN 114136519 A CN114136519 A CN 114136519A CN 202111475234 A CN202111475234 A CN 202111475234A CN 114136519 A CN114136519 A CN 114136519A
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 230000008859 change Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000001228 spectrum Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
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- 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
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- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses an automobile half-axle dynamic torque testing system, which abandons an online slip ring type testing framework, and builds a brand-new testing scheme based on an engine, a gearbox, a half axle, a strain gauge, a transmitting unit, an external antenna, a signal acquisition device and a computing mechanism, wherein the gearbox is respectively connected with the engine and the half axle, the strain gauge and the transmitting unit are respectively arranged on the half axle, and the transmitting unit is respectively connected with the strain gauge and the external antenna through electric signals; the torque generated by the engine is transmitted to the half shaft through the gearbox, so that the half shaft generates torsional deformation, the strain gauge induces the torsional deformation and then enables the output voltage of the transmitting unit to change, the external antenna sends the voltage variation to the computer through the signal acquisition device, and the computer converts the voltage value into a torque value through pre-rack calibration data, so that the dynamic torque of the half shaft can be measured. The invention avoids the defects of the existing testing mode and provides reliable support for the testing of the automobile load spectrum and the monitoring of the half shaft dynamic torque.
Description
Technical Field
The invention relates to the field of axle testing, in particular to a dynamic torque testing system for an automobile half shaft.
Background
In the research and development process of automobiles, a half-shaft torque test is an important index for evaluating the reliability of automobiles and is also an important index for evaluating engines and motors. The monitoring to the car semi-axis moment of torsion can discover unusual operating condition to semi-axis moment of torsion test data collection and analysis can provide the basis for failure diagnosis, prevent that the axle from transshipping deformation, fatigue fracture, thereby reduce the occurence of failure, guarantee safe operation.
The existing half shaft torque measurement environment is poor, the space is small, and the half shaft torque measurement environment is easy to be subjected to electromagnetic interference, particularly, the method for measuring the half shaft torque uses an online slip ring principle, the rotation speed of the half shaft is high, an electric slip ring is required to be in direct contact with a shaft during testing, so that large abrasion and obvious heating can be generated, the test mechanism is large in required space and not easy to install, and the difficulty in measuring the dynamic torque of the half shaft is large due to the reasons.
Disclosure of Invention
In view of the above, the present invention aims to provide a dynamic torque testing system for an automobile half shaft, so as to solve the shortcomings of the current dynamic torque mode of the automobile half shaft.
The technical scheme adopted by the invention is as follows:
an automotive axle shaft dynamic torque testing system comprising: the device comprises an engine, a gearbox, a half shaft, a strain gauge, a transmitting unit, an external antenna, a signal acquisition device and a computer;
the gearbox is respectively and mechanically connected with the engine and the half shaft, the strain gauge and the transmitting unit are respectively and fixedly arranged on the half shaft, and the transmitting unit is respectively and electrically connected with the strain gauge and the external antenna;
the engine is used for generating torque and transmitting the torque to the half shafts through the gearbox, so that the half shafts are subjected to torsional deformation;
the strain gauge is used for sensing the torsional deformation and triggering the output voltage of the transmitting unit to change;
the transmitting unit is used for transmitting the voltage variation to the signal acquisition device through the external antenna;
and the computer is used for converting the voltage value into a torque value according to the pre-rack calibration data after receiving the voltage variation sent by the signal acquisition device, so as to obtain a half-shaft dynamic torque test result.
In at least one possible implementation manner, the test system further includes: and the signal conditioning device is respectively in electric signal connection with the external antenna and the signal acquisition device and is used for conditioning and transmitting signals transmitted by the antenna.
In at least one possible implementation, the strain gauge is affixed to a predetermined mark on the axle shaft.
In at least one possible implementation manner, the number of the strain gauges is multiple, and the strain gauges form a strain gauge full bridge.
In at least one possible implementation manner, a plurality of strain gauges are welded to form the strain gauge full bridge.
In at least one possible implementation manner, the external antenna adopts a pre-wound coil structure.
In at least one possible implementation manner, the external antenna is fixed in a reserved area on the frame.
In at least one possible implementation manner, the signal acquisition device is in electrical signal connection with the computer through a network cable.
In at least one possible implementation manner, the obtaining manner of the gantry calibration data includes:
installing a half shaft provided with a transmitting unit and a full bridge of a strain gauge on a rack, and fixing a coil type external antenna on the rack;
continuously acquiring a plurality of voltage values output by a transmitting unit through an external antenna and a plurality of torque values provided by a rack in the calibration process according to a preset calibration working condition;
and fitting the acquired voltage value and the acquired torque value to obtain the calibration data of the rack representing the relation between the torque and the output voltage.
In at least one possible implementation, the fitting process includes fitting using a least squares method.
The invention has the main design concept that an online slip ring type test framework is abandoned, and a brand-new test scheme is established based on an engine, a gearbox, a half shaft, a strain gauge, a transmitting unit, an external antenna, a signal acquisition device and a computer, wherein the gearbox is respectively connected with the engine and the half shaft, the strain gauge and the transmitting unit are respectively arranged on the half shaft, and the transmitting unit is respectively connected with the strain gauge and the external antenna through electric signals; the torque generated by the engine is transmitted to the half shaft through the gearbox, so that the half shaft generates torsional deformation, the strain gauge induces the torsional deformation and then enables the output voltage of the transmitting unit to change, the external antenna sends the voltage variation to the computer through the signal acquisition device, and the computer converts the voltage value into a torque value through pre-rack calibration data, so that the dynamic torque of the half shaft can be measured. The invention avoids the defects of the existing testing mode, provides reliable support for the test of the automobile load spectrum and the monitoring of the dynamic torque of the half shaft, and further provides effective testing data for the formulation of the differential fatigue test outline.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an automobile half-shaft dynamic torque testing system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Before developing the embodiments of the present invention, the principle on which the present invention is designed will be explained first: by applying a torque to the half-shafts, the half-shafts will deform, and tests have found that the deformation is greatest in the 45 and 135 directions, and the following formula for the amount of deformation can be used as a basis:
where D and D are the inner and outer diameters of the half-shafts, respectively, and G is the inherent property of the half-shafts, as can be seen from the formula, the deformation amount is in direct proportion to the torque, so that it is considered that the deformation amount of the half-shafts is measured by using the torque resistance strain gauges intersected at an angle of 45 ° (135 °), the resistance variation amount of which is necessarily in linear relation to the deformation amount, and the resistance variation amount is also in linear relation to the output voltage of the transmitting unit, that is, the half-shaft torque M and the output voltage Vout of the transmitting unit have the following relation:
M＝KVout
since the K value can be calibrated on the gantry in advance, the half-shaft torque can be obtained according to the output voltage value of the transmitting unit.
Based on this, the invention proposes an embodiment of a dynamic torque testing system for automobile half-shafts, specifically, as shown in fig. 1, which includes: the device comprises an engine 1, a gearbox 2, a half shaft 3, a strain gauge 4 (a resistance strain gauge), a transmitting unit 5, an external antenna 6, a signal acquisition device 7 and a computer 8. Wherein, the transmission case 2 is mechanically connected to the engine 1 and the half shaft 3 respectively (understandably, the outer end of the half shaft 3 can be mechanically connected to a wheel), the strain gauge 4 and the transmitting unit 5 are fixedly arranged on the half shaft 3 respectively, and the transmitting unit 5 is electrically connected to the strain gauge 4 and the external antenna 6 respectively;
the engine 1 is used for generating torque and transmitting the torque to the half shaft 3 through the gearbox 2, so that the half shaft 3 is subjected to torsional deformation;
the strain gauge 4 is used for inducing the torsional deformation and triggering the output voltage of the transmitting unit 5 to change;
the transmitting unit 5 is used for transmitting the voltage variation to the signal acquisition device 7 through the external antenna 6;
and the computer 8 is used for converting the voltage value into a torque value according to the pre-rack calibration data after receiving the voltage variation sent by the signal acquisition device 7, so as to obtain a half-axle dynamic torque test result.
Further, the automobile half-shaft dynamic torque testing system further comprises: and the signal conditioning device 9 is electrically connected with the external antenna 6 and the signal acquisition device 7 respectively, and is used for conditioning signals transmitted by the antenna.
Further, the strain gauge 4 is adhered to a preset mark on the half shaft 3.
Further, the number of the strain gauges 4 is multiple, and a strain gauge full bridge is formed.
Further, a plurality of the strain gauges 4 are welded to form the strain gauge full bridge.
Further, the external antenna 6 adopts a pre-wound coil structure.
Further, the external antenna 6 is fixed in a reserved area on the frame.
Further, the signal acquisition device 7 is connected with the computer 8 through a network cable in an electric signal mode.
Further, the obtaining of the gantry calibration data includes:
installing a half shaft provided with a transmitting unit and a full bridge of a strain gauge on a rack, and fixing a coil type external antenna on the rack;
continuously collecting a voltage value of the transmitting unit and a torque value provided by the rack in the calibration process according to a preset calibration working condition;
and fitting the acquired voltage value and the acquired torque value to obtain the calibration data (namely the aforementioned K value) of the rack representing the relation between the torque and the output voltage.
Further, the fitting process includes fitting using a least squares method.
In summary, the main design concept of the present invention is that an online slip-ring test architecture is abandoned, and a completely new test scheme is constructed based on an engine, a transmission case, a half shaft, a strain gauge, a transmitting unit, an external antenna, a signal acquisition device, and a computer, specifically, the transmission case is respectively connected with the engine and the half shaft, the strain gauge and the transmitting unit are respectively arranged on the half shaft, and the transmitting unit is respectively connected with the strain gauge and the external antenna through electrical signals; the torque generated by the engine is transmitted to the half shaft through the gearbox, so that the half shaft generates torsional deformation, the strain gauge induces the torsional deformation and then enables the output voltage of the transmitting unit to change, the external antenna sends the voltage variation to the computer through the signal acquisition device, and the computer converts the voltage value into a torque value through pre-rack calibration data, so that the dynamic torque of the half shaft can be measured. The invention avoids the defects of the existing testing mode, provides reliable support for the test of the automobile load spectrum and the monitoring of the dynamic torque of the half shaft, and further provides effective testing data for the formulation of the differential fatigue test outline.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.
Claims (10)
1. An automotive axle shaft dynamic torque testing system, comprising: the device comprises an engine, a gearbox, a half shaft, a strain gauge, a transmitting unit, an external antenna, a signal acquisition device and a computer;
the gearbox is respectively and mechanically connected with the engine and the half shaft, the strain gauge and the transmitting unit are respectively and fixedly arranged on the half shaft, and the transmitting unit is respectively and electrically connected with the strain gauge and the external antenna;
the engine is used for generating torque and transmitting the torque to the half shafts through the gearbox, so that the half shafts are subjected to torsional deformation;
the strain gauge is used for sensing the torsional deformation and triggering the output voltage of the transmitting unit to change;
the transmitting unit is used for transmitting the voltage variation to the signal acquisition device through the external antenna;
and the computer is used for converting the voltage value into a torque value according to the pre-rack calibration data after receiving the voltage variation sent by the signal acquisition device, so as to obtain a half-shaft dynamic torque test result.
2. The automotive axle shaft dynamic torque testing system of claim 1, further comprising: and the signal conditioning device is respectively in electric signal connection with the external antenna and the signal acquisition device and is used for conditioning and transmitting signals transmitted by the antenna.
3. The automotive axle shaft dynamic torque testing system of claim 1, wherein the strain gauge is affixed to the axle shaft at a predetermined marking.
4. The automotive half-shaft dynamic torque testing system according to claim 1, wherein the number of the strain gauges is multiple, and the strain gauges form a full-bridge strain gauge.
5. The automotive half shaft dynamic torque testing system of claim 4, wherein a plurality of the strain gages are welded into the full strain gage bridge.
6. The system for testing dynamic torque of automotive half shafts according to claim 1, wherein the external antenna is of a pre-wound coil structure.
7. The system for testing dynamic torque of automotive half shafts according to claim 1, wherein the external antenna is fixed to a reserved area on the frame.
8. The automotive half-shaft dynamic torque testing system according to claim 1, wherein the signal acquisition device is in electrical signal connection with the computer through a network cable.
9. The system for testing the dynamic torque of the automobile half shaft according to any one of claims 1 to 8, wherein the bench calibration data is obtained in a manner that includes:
installing a half shaft provided with a transmitting unit and a full bridge of a strain gauge on a rack, and fixing a coil type external antenna on the rack;
continuously acquiring a plurality of voltage values output by a transmitting unit through an external antenna and a plurality of torque values provided by a rack in the calibration process according to a preset calibration working condition;
and fitting the acquired voltage value and the acquired torque value to obtain the calibration data of the rack representing the relation between the torque and the output voltage.
10. The automotive axle shaft dynamic torque testing system of claim 9, wherein the fitting process includes fitting using a least squares method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111475234.8A CN114136519A (en) | 2021-12-03 | 2021-12-03 | Automobile half-axle dynamic torque testing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111475234.8A CN114136519A (en) | 2021-12-03 | 2021-12-03 | Automobile half-axle dynamic torque testing system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674571A (en) * | 2014-01-03 | 2014-03-26 | 重庆市科学技术研究院 | Automatic transmission loading spectrum collecting and compiling method used for indoor bench test |
| CN109470389A (en) * | 2018-11-27 | 2019-03-15 | 上海应用技术大学 | Strain-type torch measuring system and method |
| CN111044189A (en) * | 2019-12-24 | 2020-04-21 | 中国第一汽车股份有限公司 | Testing device and testing method for transmission efficiency of plug-in hybrid power transmission |
| CN111829706A (en) * | 2020-08-04 | 2020-10-27 | 中国汽车工程研究院股份有限公司 | Half-shaft torque calibration device and working method thereof |
-
2021
- 2021-12-03 CN CN202111475234.8A patent/CN114136519A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674571A (en) * | 2014-01-03 | 2014-03-26 | 重庆市科学技术研究院 | Automatic transmission loading spectrum collecting and compiling method used for indoor bench test |
| CN109470389A (en) * | 2018-11-27 | 2019-03-15 | 上海应用技术大学 | Strain-type torch measuring system and method |
| CN111044189A (en) * | 2019-12-24 | 2020-04-21 | 中国第一汽车股份有限公司 | Testing device and testing method for transmission efficiency of plug-in hybrid power transmission |
| CN111829706A (en) * | 2020-08-04 | 2020-10-27 | 中国汽车工程研究院股份有限公司 | Half-shaft torque calibration device and working method thereof |
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