CN102589772B - Electric power steering system torque sensor - Google Patents
Electric power steering system torque sensor Download PDFInfo
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- CN102589772B CN102589772B CN 201210075409 CN201210075409A CN102589772B CN 102589772 B CN102589772 B CN 102589772B CN 201210075409 CN201210075409 CN 201210075409 CN 201210075409 A CN201210075409 A CN 201210075409A CN 102589772 B CN102589772 B CN 102589772B
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Abstract
A novel electric power steering system torque sensor comprises casings, a speed reduction mechanism, an output shaft, a torsion bar, an input shaft and a sensing part. The lower portion of the input shaft is installed on an upper casing through a bearing, a lower casing supports the lower portion of the output shaft through a bearing, and the input shaft is connected with the output shaft through the torsion bar, the sensing part of the sensor serves as the coinciding portion for installing the input shaft and the output shaft. In the sensing part, the tail end of the input shaft is embedded into a magnetic pole, a sensing ring retainer is installed at the upper portion of the output shaft, a sensing ring is embedded in the retainer, a magnetic line conveying ring is arranged on an outer ring of the sensing ring in matching mode, the magnetic line conveying ring is embedded in a support frame of the conveying ring, and the support frame of the conveying ring and the sensor are formed into a whole through a mould. Simultaneously, two support lugs extend from the magnetic line conveying ring and lead a magnetic line from the magnetic pole inside the sensor to the position of a socket. The novel electric power steering system torque sensor is good in integration performance, small in measurement errors, simple in real time compensation and capable of effectively reducing production cost and prolonging service life of associated equipment.
Description
Technical field
The present invention relates to a kind of torque sensor of automobile electric booster steering system, furtherly, is a kind of non-contact torque sensor structure.
Background technology
Automobile steering system is an important vehicle chassis component of automobile, involves the rideability of automobile.The performance of steering directly has influence on the control stability of automobile, and it reduces traffic hazard and protection driver's personal safety for the safety of guaranteeing vehicle, alleviates driver's labour intensity important role.
Electric boosting steering system is a kind of power steering system that the power-assisted energy is provided by motor: when driver's steering wheel rotation, torque sensor is started working, the displacement that relatively rotates that input shaft and output shaft are produced under the torsion bar effect becomes electric signal and passes to the ECU(controller), ECU has size according to sense of rotation and the power-assisted electric current of the signal deciding motor of vehicle speed sensor and torque sensor, thereby complete real-time power-assisted steering, controls.Therefore it can realize providing different power-assisted effects by motor at an easy rate when the speed of a motor vehicle is different, guarantees automobile light and flexible when low speed driving, reliable and stable while running at high speed.
The development of current domestic electric boosting steering system (Electronic Power Steering is called for short EPS) is rapid, and early 5 years research and development manufacturing enterprises develop into tens by several families and even go up hundred.Due to the raising of domestic automobile integral level, EPS is proposed to prior performance index and reliability requirement.Because the requirement that EPS is reached safely to technology is very high, the large vitals (sensor and ECU) of in EPS two is had higher requirement so, because ECU controls the power-assisted size according to torque signal, the sensor that is in so the signal source front end requires just higher.
EPS mainly is comprised of torque sensor, vehicle speed sensor, assist motor and reducing gear, ECU control module.The size of general EPS power-assisted is only relevant to the speed of a motor vehicle, namely what is often called speed of a motor vehicle induction type.External last century the nineties the EPS product in, particularly the manufacturer of Japan is main mainly with touch sensor, the sensor of the contact that domestic early stage or even present most of manufacturer all still adopts, the sensor that only has the domestic production producer employing magneto-electric of only a few, and at the initial stage in this century, EPS sensor development both domestic and external has presented the state that all sorts of flowers contend, and magneto-electric is arranged, photo-electric, reluctance type, Hall-type etc., and just multiply two or three kind of structure with regard to the magneto-electric principle.Therefore, develop advanced EPS sensor the development of EPS industry is had to far-reaching influence.
Summary of the invention
Technical matters solved by the invention is to provide a kind of novel electric boosting steering system torque sensor, and this torque sensor structural volume is little, simple in structure.In process of production, facilitate the sensor zeroing, thereby use simply, reduced manufacturing cost.Facilitate arrangement, reduced installing space, with low cost.
Technical matters solved by the invention realizes by the following technical solutions:
A kind of novel electric boosting steering system torque sensor, comprise: housing, reducing gear, output shaft, torsion bar, input shaft and sensing element, wherein, housing comprises upper shell and lower house two parts, reducing gear is arranged on the end of sensor, and connects output shaft, and the output shaft front end connects input shaft, the input shaft bottom is arranged on upper shell by bearing, and lower house is by bearings output shaft bottom; Described output shaft hollow, input shaft rear portion hollow, both connect by torsion bar by center section, simultaneously, the input shaft rear portion also has the column type groove, and column type groove internal diameter is inserting output shaft to be as the criterion, make output shaft and input shaft after assembling completes, can partially overlap in its junction.
The sensing element of sensor is arranged on the intersection of input shaft and output shaft, and is enclosed in upper shell, comprises magnetic pole, inductance loop, Hall element and sensor.Described magnetic pole embeds the input the tip of the axis, for the equally distributed magnetic pole of the magnetic line of force, the top of output shaft and input shaft end intersection, coordinate the inductance loop retainer be installed, embedded the inductance loop of soft magnet material in retainer, the inductance loop belt edge has toothing; Be combined with the magnet-wire transmission ring in the inductance loop outer ring, the magnet-wire transmission ring is embedded in the transmission ring bracing frame by Shooting Technique, transmission ring bracing frame and sensor socket are made of one by mould, and the magnet-wire transmission ring is extended with two journal stirrups, be inserted with hall device between two journal stirrups, for the magnetic line of force is drawn out to the sensor socket place from the sensor internal magnetic pole.
Whole transducing part utilizes Hall element to detect magnetic field and the variation thereof of the intersection of input shaft and output shaft, at Hall element rear portion connecting sensor plug, and by sensor socket, torque signal is outputed on the external treatment device.
In the present invention, because magnetic pole is N/S the two poles of the earth alternative arrangement, therefore, described inductance loop should comprise upper and lower two, and the profile of tooth of the toothing of upper and lower two inductance loops should stagger, simultaneously, the magnet-wire transmission ring is also two of left and right, form like this two magnetic line of force closed loops, because electric power steering torsion bar left-right rotation angle is ± 4 °, so in rotating ± 4 °, monotone increasing of two flux loop, a monotone decreasing, in order to reduce error in data-gathering process.
In the present invention, Hall element is the programmable hall element, simultaneously, its underpart also is connected with a control circuit board, thereby after inducing the input torque size, by two flux loop process processing of circuit, the main road voltage of output transducer characteristic and bypass voltage, and the monotonicity of two-way characteristic is contrary.
Beneficial effect of the present invention is:
1. the invention enables each part of sensor to be embedded on interior each part of EPS reducer shell, make each part of sensor break the whole up into parts, reduced like this supporting structure of the housing of sensor own and relevant sensing element.Make cost, smaller volume, the advantages such as storage part minimizing;
2. magnet is embedded on input shaft, the magnetic induction parts is made to endless belt dentation wringing fit and install on output shaft.When the driver inputs a moment of torsion, the input shaft that the upper and lower two ends of torsion bar connect and output shaft will the output relative angular displacements, make like this induced field even.Due to steering column, due to the error on manufacturing, cause can producing enough end play after using certain hour, the method for the uniform magnetic pole of employing input shaft will be not too responsive to end play;
3. patent of the present invention adopts programmable hall, and integrating external circuit and single-chip microcomputer, Hall components and parts one reduce external disturbance.Owing to adopting the programmable hall device, so torque sensor centering in real time adjusts the sensor zero point current potential, but also real-Time Compensation change more simple.The backlash compensation caused comprising temperature and alignment error;
4. whole sensor is installed separately mechanical part, magnetic line of force sensing part and programmable hall device, circuit board section, has formed in sensor outer member separately, key component and common separately, the parts that easily worn part and reliable parts separate.Due to mechanical part, magnetic line of force induction noncontact, not fragile, and on programmable hall device, circuit board, electron device burns out or lost efficacy after long-time use, programmable hall device and circuit board are made on plug, and mechanical part, magnetic line of force sensing part are placed on (in reducer shell) in socket, if electron device break, as long as the replacing plug, and dismounting is simple, can not touch the mechanical part in reducer shell.Maintenance cost is low.
The accompanying drawing explanation
The schematic diagram that Fig. 1 is preferred embodiment of the present invention.
The sensor plug schematic cross-section that Fig. 2 is preferred embodiment of the present invention.
The local amplification assumption diagram of the sensor that Fig. 3 is preferred embodiment of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Preferred embodiment referring to a kind of novel electric boosting steering system torque sensor of Fig. 1, its input shaft 9 bottoms are arranged on upper shell 1 by bearing, lower house 3 is by bearings output shaft 2 bottoms, when at input shaft 9 input torque, because torsion bar 4 is flexible members, between output shaft 2 and input shaft 9, will produce differential seat angle.After producing differential seat angle, just have changes of magnetic field between magnetic pole 8 and inductance loop 6, because magnetic pole 8 is distributed on the circumference of input shaft 9 bottoms, and N/S is interspersed, the inductance loop 6 be arranged on output shaft 2 by transmission ring bracing frame 10 is also to be staggered circle distribution, in limited angle, when inductance loop 6 pressed on ring magnetic fields increase, 6 times ring magnetic fields of inductance loop reduce, by magnet-wire transmission ring 7, the magnetic line of force is delivered on transmission ring bracing frame 10, namely magnetic field is incorporated on sensor socket 14 simultaneously, when sensor plug 12 inserts sensor socket, because programmable hall device 11 and circuit board 13 are included in sensor plug, programmable hall device 11 is just disposed in magnetic field, because the variation in magnetic field will cause the variation of programmable hall device 11 output voltages, the sensor moment of torsion magnitude of voltage of the processing stable output of process circuit board 13.
When there is no the moment of torsion input, the magnetic field in sensor and the magnetic field of inductance loop 6 and magnet-wire transmission ring 7 keep a constant value constant, and in adjusting through oversampling circuit plate 13 (zeroing), the torque sensor output voltage values is zero.
In order to save installing space, the while simplified structure, in the present embodiment, magnetic pole 8 is embedded on input shaft 9, with input shaft 9, have a style of one's own, inductance loop 6 is ensconced in inductance loop retainer 5 by injection moulding, inductance loop retainer 5 is installed with output shaft 2 wringing fits, transmission ring bracing frame 10 and sensor socket 14 are made of one, and transmission ring bracing frame 10 is also inlayed and is encircled within it, the journal stirrup of magnet-wire transmission ring 7 stretches out in sensor socket 14, programmable hall device 11 and circuit board 13 are included on sensor plug 12, after sensor plug 12 is inserted to sensor socket 14, whole flux loop has just been set up.After the interlock circuit on circuit board 13 is processed with regard to output transducer moment of torsion magnitude of voltage.
Above demonstration and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (5)
1. a novel electric boosting steering system torque sensor, comprise housing, reducing gear, output shaft, torsion bar, input shaft and sensing element, it is characterized in that, housing comprises upper shell and lower house two parts, reducing gear is arranged on the end of sensor and connects output shaft, the output shaft front end connects input shaft, and the input shaft bottom is arranged on upper shell by bearing, and lower house is by bearings output shaft bottom; Described output shaft hollow, input shaft rear portion hollow, both connect by torsion bar by center section, simultaneously, the input shaft rear portion also has the column type groove, and column type groove internal diameter is inserting output shaft to be as the criterion, make output shaft and input shaft after assembling completes, can partially overlap in its junction; The sensing element of sensor is arranged on the intersection of input shaft and output shaft, and is enclosed in upper shell, comprises magnetic pole, inductance loop, Hall element and circuit board.
2. a kind of novel electric boosting steering system torque sensor according to claim 1, it is characterized in that, in described sensing element, magnetic pole embeds the input the tip of the axis, for the equally distributed magnetic pole of the magnetic line of force, the top of output shaft and input shaft end intersection, coordinate the inductance loop retainer be installed, embedded the inductance loop of soft magnet material in retainer, the inductance loop belt edge has toothing.
3. a kind of novel electric boosting steering system torque sensor according to claim 1, it is characterized in that, be combined with the magnet-wire transmission ring in the inductance loop outer ring, the magnet-wire transmission ring is embedded in the transmission ring bracing frame by Shooting Technique, transmission ring bracing frame and sensor socket are made of one by mould, and the magnet-wire transmission ring is extended with two journal stirrups, between two journal stirrups, be inserted with hall device.
4. a kind of novel electric boosting steering system torque sensor according to claim 1, is characterized in that, described inductance loop should comprise upper and lower two, and the profile of tooth of the toothing of upper and lower two inductance loops should stagger.
5. a kind of novel electric boosting steering system torque sensor according to claim 1, is characterized in that, described Hall element is the programmable hall element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210075409 CN102589772B (en) | 2012-03-21 | 2012-03-21 | Electric power steering system torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210075409 CN102589772B (en) | 2012-03-21 | 2012-03-21 | Electric power steering system torque sensor |
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| Publication Number | Publication Date |
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| CN102589772A CN102589772A (en) | 2012-07-18 |
| CN102589772B true CN102589772B (en) | 2013-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210075409 Active CN102589772B (en) | 2012-03-21 | 2012-03-21 | Electric power steering system torque sensor |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201800005297A1 (en) | 2018-05-11 | 2019-11-11 | BICYCLE CRANK AND RELATIVE CRANKSET | |
| IT201800005299A1 (en) | 2018-05-11 | 2019-11-11 | BICYCLE COMPONENT EQUIPPED WITH STRESS / DEFORMATION SENSOR COMPENSATED FOR TEMPERATURE | |
| CA3042547A1 (en) | 2018-05-11 | 2019-11-11 | Campagnolo S.R.L. | Bicycle crankarm provided with electric/electronic system |
| IT201800005294A1 (en) | 2018-05-11 | 2019-11-11 | COMPONENT OF BICYCLE IN COMPOSITE MATERIAL AND RELATED MANUFACTURING PROCESS | |
| IT201800005302A1 (en) | 2018-05-11 | 2019-11-11 | TRANSMISSION SIDE BICYCLE CRANK, EQUIPPED WITH STRESS / DEFORMATION DETECTOR FOR A TORQUE OR POWER METER, AS WELL AS RELATED METHODS | |
| CN110653992A (en) * | 2018-06-29 | 2020-01-07 | 长城汽车股份有限公司 | Torque sensor housing and method of manufacturing the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002272076A (en) * | 2001-03-06 | 2002-09-20 | Kofu Meidensha:Kk | Direct drive brushless motor |
| CN1433514A (en) * | 1999-12-04 | 2003-07-30 | 罗伯特-博希股份公司 | Sensor system for detecting angle of rotation and/or torque |
| CN2927017Y (en) * | 2006-06-30 | 2007-07-25 | 上海自动化仪表股份有限公司 | Torque-inspecting mechanism of electric executing mechanism |
| CN101013055A (en) * | 2006-01-31 | 2007-08-08 | 株式会社捷太格特 | Torque detection device |
| CN201096565Y (en) * | 2007-09-04 | 2008-08-06 | 刘海平 | Electric motor-assisted vehicle moment sensing device |
| CN201983887U (en) * | 2010-12-09 | 2011-09-21 | 天津市松正电动汽车技术股份有限公司 | Non-contact torque sensor and electric power-assisted steering system |
-
2012
- 2012-03-21 CN CN 201210075409 patent/CN102589772B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1433514A (en) * | 1999-12-04 | 2003-07-30 | 罗伯特-博希股份公司 | Sensor system for detecting angle of rotation and/or torque |
| JP2002272076A (en) * | 2001-03-06 | 2002-09-20 | Kofu Meidensha:Kk | Direct drive brushless motor |
| CN101013055A (en) * | 2006-01-31 | 2007-08-08 | 株式会社捷太格特 | Torque detection device |
| CN2927017Y (en) * | 2006-06-30 | 2007-07-25 | 上海自动化仪表股份有限公司 | Torque-inspecting mechanism of electric executing mechanism |
| CN201096565Y (en) * | 2007-09-04 | 2008-08-06 | 刘海平 | Electric motor-assisted vehicle moment sensing device |
| CN201983887U (en) * | 2010-12-09 | 2011-09-21 | 天津市松正电动汽车技术股份有限公司 | Non-contact torque sensor and electric power-assisted steering system |
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| CN102589772A (en) | 2012-07-18 |
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Effective date of registration: 20210207 Address after: 412000 Room 201, 100 Hangkong Road, Lusong District, Zhuzhou City, Hunan Province Patentee after: Hunan Dongjia Intelligent Technology Co.,Ltd. Address before: Dong Jia Duan High-tech Industrial Park in Hunan province Zhuzhou city Lusong District 412000 Patentee before: ZHUZHOU ELITE ELECTRO MECHANICAL Co.,Ltd. |