CN103528601A - Non-contact compound torque and angle position sensor - Google Patents
Non-contact compound torque and angle position sensor Download PDFInfo
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- CN103528601A CN103528601A CN201310461236.0A CN201310461236A CN103528601A CN 103528601 A CN103528601 A CN 103528601A CN 201310461236 A CN201310461236 A CN 201310461236A CN 103528601 A CN103528601 A CN 103528601A
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Abstract
The invention discloses a non-contact compound torque and angle position sensor, which comprises a driving gear assembly, a driven gear assembly, a measuring circuit and tested elements, wherein the driving gear assembly comprises two driving gears which are in coaxial rotation, the driven gear assembly is engaged with the driving gear assembly and is driven to rotate by the driving gear assembly, the measuring circuit is arranged between the two driving gears, the tested elements are arranged on the driven gear assembly and is driven to rotate by the driven gear assembly, the measuring circuit measures the rotating angle of the tested elements, and the torque and the angle position are calculated according to the rotating angle. The non-contact compound torque and angle position sensor has the advantages that the torque and the angle position are simultaneously calculated, the measuring range is wide, the precision is high, the structure is compact, and the assembly is simple.
Description
Technical field
The invention belongs to automobile electric booster steering system (EPS) technology, especially a kind of magnetosensitive angle chip poor direction of measurement dish simultaneously that takes measurement of an angle that utilizes is handled noncontact combined type moment of torsion and the angular position sensor of torque and steering wheel angle position.
Background technology
Known ground, automobile electric booster steering system EPS is generally comprised of power steering electric machine controller ECU, torque sensor, direct current generator with clutch coupling, reduction gear turbine and worm, mechanical steering device (comprise bearing circle input and output shaft, turn to torsion bar, steering column, steering drive axle, gear, tooth bar etc.) five parts.The Torsion rod signal decision-making power-assisted size that controller ECU detects by torque sensor, sends the action that current-order is controlled power-assisted steering motor.First, driver's steering wheel rotation, has applied certain operating torque to bearing circle, turns to torsion bar generation deformation, and torque sensor detects this deformation quantity.Meanwhile, vehicle speed sensor (being positioned at ABS system) is measured vehicle current driving speed, and motor is also input to ECU current signal and motor corner (position).Then, required dreamboat assist torque when ECU goes out to implement power steering according to internal control policy calculation, is converted into current-order and issues motor; Finally, the assist torque that motor produces on mechanical steering device, overcomes steering resisting moment with together with driver's operating torque through reducing gear amplification, realizes that vehicle is light to be turned to.Strictly, the high-grade EPS system of the overwhelming majority and the middle-grade EPS system of part are except above-mentioned Power assisted control function, also will have the damping control function that reduces bearing circle shake and the active aligning control function that bearing circle is taken to zero-bit, ECU realizes these two functions need to gather steering wheel angle positional information accurately simultaneously.
EPS system realizes three control functions simultaneously just must arrange bearing circle angular position sensor.When driver applies operating torque, bearing circle rotates necessarily (circle or a multi-turn) angle, steering wheel angle position transducer detects this angle position and is converted to electric signal and is defeated by controller ECU, according to the zero drift of the steering wheel angle position of this signal representative and controller calculating, ECU controls assist motor and produces corresponding damping, by assist motor, bearing circle is taken back to zero-bit.Existing torque sensor will detect operating torque and steering wheel angle position simultaneously, is contact (pot) combined type moment of torsion and angular position sensor, is installed on steering column.Moment of torsion and angular position information are slided on the thick-film resistor pattern on two pcb boards and are obtained respectively by a plurality of Assembled electric brushes, and the brush moment of torsion voltage signal that angle among a small circle can output linearity that slides, is directly defeated by ECU sampling and uses; Brush slips over multi-turn thick-film resistor and meter number of turns resistance is exportable every circle voltage signal and meter number of turns voltage signal, then by ECU sampling calculated direction dish angle position.The shortcoming of this contact potential meter formula sensor be fragile, the life-span is short, not only produce very high replacement cost after sale, and have a strong impact on EPS system performance.
Existing another kind of conventional torque sensor only can detect operating torque, is noncontact (electromagnetic coupled) torque sensor, comprises based on electromagnetic induction coil principle and magnetosensitive effect principle.The leakage field ring edge of sensor is enclosed within ferromagnetism tooth bar or permanent magnet outside, both relative motions, and the ferromagnetic bar of exposure or permanent magnet area change and cause the inductance of coil or the magnetic flux change that magneto-dependent sensor detects, and directly export proportional voltage signal.But, in limited steering column space, the structural design of this class torque sensor is very complicated, increase angle position measurement function and become noncontact (electromagnetic coupled) combined type moment of torsion and angular position sensor, certainly will increase again structural complexity, and tubing string space do not allow completely, this is a more scabrous technical matters.
Summary of the invention
It is high that the present invention has overcome in prior art the fast maintenance cost of contact potential meter formula depletion sensor, torque sensor complex structure, and the defects such as unicity are measured in moment of torsion and angle position, noncontact combined type moment of torsion and angular position sensor that a kind of direction of measurement dish is simultaneously handled moment of torsion and steering wheel angle position have been proposed
Combined type moment of torsion and an angular position sensor, comprising: the driving gear assembly of coaxial rotating; With the follower gear assembly of described driving gear assembly engagement, described follower gear assembly is rotated by described driving gear Component driver; Be arranged on the metering circuit between described driving gear assembly; And be arranged on the detected element on described follower gear assembly, and described detected element is via described follower gear assembly driven rotary, and described metering circuit is measured the anglec of rotation of described detected element, according to described anglec of rotation calculated torque and angle position.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described driving gear assembly comprises the first driving gear and the second driving gear; Described the first driving gear and described the second driving gear coaxially arrange.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described the first driving gear comprises the first main body, the outer rim of described the first main body is provided with the first gear part, the axle center of described the first main body is provided with the first hollow bulb, the first hollow posts body raising up around described the first hollow bulb setting; The inside surface of described the first hollow posts body is provided with outward extending the first rotor; The top of described hollow posts body is provided with a pair of deep-slotted chip breaker; Described the second driving gear comprises the second main body, the outer rim of described the second main body is provided with the second gear part, described the second main body axle center be provided with the second hollow bulb, the the second hollow posts body raising up around described the second hollow bulb setting, the inside surface of described the second hollow posts body is provided with outward extending the second rotor, described the second main body is provided with boss, and described boss contacts with the top of described the first hollow posts body.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described the first main body is identical with described the second main body, and described the first gear part is identical with the number of teeth of described the second gear part.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described follower gear assembly comprises at least 2 follower gears; Described follower gear comprise follower gear portion and with the fixing linkage portion of described follower gear portion; Described follower gear portion and the engagement of described driving gear assembly, and with described driving gear assembly rotation; In described linkage portion, be provided with described detected element.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described follower gear assembly comprises 3 follower gears: the first follower gear, the second follower gear and the 3rd follower gear; Described the first follower gear is different from the number of gears of described the second follower gear.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described metering circuit comprises circuit main body, at least one sensing element; Described sensing element is arranged in described circuit main body; Described sensing element is measured the anglec of rotation of described detected element, by described circuit main body, calculates described moment of torsion and described angle position.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, described sensing element is right against described detected element setting.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, further comprise the telegraph circuit being connected with described metering circuit.
Noncontact combined type moment of torsion and angular position sensor that the present invention proposes, further comprise the housing being arranged on outside described driving gear assembly and described follower gear assembly.
Noncontact combined type moment of torsion of the present invention and angular position sensor are applied in electric direction converter of vehicle, ingehious design gear drive group, apply three magnetosensitive angle chips and ask between two poor method energy while calculated torque and angle position, measurement range is large, precision is high, and compact conformation, assembling are simply.
Accompanying drawing explanation
Fig. 1 is the cut-away view of noncontact combined type moment of torsion of the present invention and angular position sensor.
Fig. 2 is the schematic diagram of noncontact combined type moment of torsion and angular position sensor.
Fig. 3 is the schematic diagram of metering circuit.
Fig. 4 is the schematic diagram of base.
Fig. 5 is the schematic diagram of top cover.
Fig. 6 is the schematic diagram of the first driving gear and follower gear thereof.
Fig. 7 is the schematic diagram of the second driving gear and follower gear thereof.
Fig. 8 is the schematic diagram of first follower gear.
Fig. 9 is the schematic diagram of second follower gear.
Figure 10 is the schematic diagram of the 3rd follower gear.
Embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the content of mentioning specially below, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
What Fig. 1 to Figure 10 showed is noncontact combined type moment of torsion and the angular position sensor being applied in automobile electric booster steering system EPS, and its skin is housing.Consult Fig. 4 and Fig. 5, housing comprises the base 1 and top cover 8 cooperatively interacting, and base 1 and top cover 8 form the cylindrical housings of hollows, and base 1 is hollow with the center of top cover 8, thereby the present invention is arranged in EPS.Between base 1 and top cover 8, be provided with driving gear assembly, with the follower gear assembly of driving gear assembly engagement.The turning to input shaft and turn to output shaft to be connected and synchronize rotation of driving gear assembly and bearing circle, thus drive follower gear assembly to do rotation without acceptance of persons.In driving gear assembly, be provided with metering circuit 5, on follower gear assembly, be provided with detected element.When steering wheel rotation causes the rotation of follower gear assembly, metering circuit 5 is by measuring the anglec of rotation of detected element, thus the moment of torsion of direction of measurement dish and angle position thereof.
Specifically as shown in Figure 1, driving gear assembly comprises the first driving gear 2 and the second driving gear 6.The first driving gear and the second driving gear can coaxial rotatings.
The first driving gear 2 is arranged in base 1.Consult Fig. 6, the first driving gear 2 comprises the first main body of dish type, and the outer rim of the first main body is provided with the first gear part, and the number of teeth of the first gear part is 135.The axle center of the first main body is provided with the first hollow bulb, the first hollow posts body 22 raising up around the first hollow bulb setting.
Preferably, be provided with to keeper 19, the first hollow posts bodies 22 of upper process and be nested on keeper 19 on base 1, the inside surface of the first hollow posts body 22 is provided with the first rotor 23 extending to base 1; The top of hollow posts body 22 is provided with a pair of deep-slotted chip breaker 11a, 11b.As shown in Figure 2, the first rotor 23 comprises at least 6 axial location claws, and the axial location claw of the first rotor 23 buckles into turning in input shaft of bearing circle and is connected with it, thereby makes the first driving gear 2 and turn to input shaft synchronous rotary.
The second driving gear 6 is arranged in top cover; Consult Fig. 7, the second driving gear 6 comprises the second main body of dish type, and its modulus is identical with the first main body.The outer rim of the second main body is provided with the second gear part, and the number of teeth of the second gear part is 135.The second main body axle center be provided with the second hollow bulb, the second hollow posts body 21 raising up around the second hollow bulb setting.
Preferably, on top cover 8, be provided with to the inside surface of pilot hole 20, the second hollow posts bodies 21 of upper process and be provided with to the second rotor 24 extending in the pilot hole 20 of top cover 8.As shown in Figure 2, the second rotor 24 comprises at least 6 axial location claws, and the axial location claw of the second rotor 24 buckles into turning in output shaft of bearing circle and is connected with it, thereby makes the second driving gear 6 and turn to output shaft synchronous rotation.The side contacting with the first driving gear 2 in the second main body is provided with two boss 10a, 10b, and boss 10a contacts with the top of the first hollow posts body with boss 10b.When boss 10a and boss 10b fall into deep-slotted chip breaker 11a, during 11b, the first driving gear 2 is synchronizeed rotation with the second driving gear 6.
Follower gear assembly comprises at least 2 follower gears, and 2 follower gears produce when rotating that absolute angle is poor or relative angle is poor.In the present embodiment, follower gear assembly comprises 3 follower gears: the first follower gear 3, the second follower gear 4 and the 3rd follower gear 7.Consult Fig. 8, the first follower gear 3 comprises the 3b of follower gear portion, and the linkage portion 3c being connected with the 3b of follower gear portion.The axle center of the 3b of follower gear portion is hollow, and mate with the reference column 3d being arranged on base 1 in the axle center of this hollow, thereby the first follower gear 3 is fixed on base 1 and can rotates around reference column 3d.The number of teeth of the 3b of follower gear portion is 16.In linkage portion 3c, be provided with detected element 3a.
Similarly, consult Fig. 9, the second follower gear 4 comprises the 4b of follower gear portion, and the linkage portion 4c being connected with the 4b of follower gear portion.The axle center of the 4b of follower gear portion is hollow, and mate with the reference column 4d being arranged on base 1 in the axle center of this hollow, thereby the second follower gear 4 is fixed on base 1 and can rotates around reference column 4d.The number of teeth of the 4b of follower gear portion is 17.Because the number of teeth of the 4b of follower gear portion is different from the number of teeth of the 3b of follower gear portion, thereby it is poor to form when rotated absolute angle.In linkage portion 4c, be provided with detected element 4a.
Consult Figure 10, the 3rd follower gear 7 comprises the 7b of follower gear portion, and the linkage portion 7c being connected with the 7b of follower gear portion.The axle center of the 7b of follower gear portion is hollow, and mate with the reference column 7d being arranged on top cover 8 in the axle center of this hollow, thereby the 3rd follower gear 7 is fixed on base 1 and can rotates around reference column 7d.The number of teeth of the 7b of follower gear portion is 16.In linkage portion 7c, be provided with detected element 7a.The number of teeth of the 7b of follower gear portion is identical with the number of teeth of the 3b of follower gear portion, but in actual use, the second driving gear 6 can lag behind the first driving gear 2 rotations, therefore between the first follower gear 3 and the 3rd follower gear 7, can produce relative angle poor.
Therefore, it is poor poor with relative angle that follower gear assembly produces absolute angle when rotating simultaneously, makes the present invention can be poor according to absolute angle and angle position and the moment of torsion of direction of measurement dish of poor while of relative angle.
Further, base 1 is provided with three and establishes threaded cylinder 14a, 14b, and 14c, is provided with accordingly three and establishes threaded cylinder 15a on top cover 8,15b, 15c, is correspondingly provided with three through hole 17a, 17b, 17c in metering circuit 5. Cylinder 14a, 14b, the top of 14c is provided with ladder-type structure, through hole 17a, 17b, 17c mates with this ladder-type structure.Metering circuit 5 is fixed in this ladder-type structure, cylinder 14a, and 14b, 14c and cylinder 15a, 15b, 15c passes through three bolt 13a, 13b, 13c fixes.
Preferably, the outer race of telegraph circuit 18 is provided with buckle structure 9, thus guard electrode circuit 18.Buckle structure 9 comprises buckle 9a and draw-in groove 9b, and buckle 9a and draw-in groove 9b are separately positioned on the outside of base 1 and top cover 8.Buckle 9a and draw-in groove 9b can also be integral setting with base 1 and top cover 8.
When rotating of steering wheel, connect the middle torsion bar generation deformation that turns to input shaft and turn to output shaft, with the first driving gear 2 that turns to output shaft to be connected by clockwise rotating, the first driving gear 2 drives the first follower gear 3 and the second follower gear 4 rotations with its engagement, but the number of teeth of the first follower gear 3 and the second follower gear 4 is different, causes that the different generation absolute angle of all angular velocity of slewing circle is poor.Rotate by clockwise hysteresis the first driving gear 2 with the second driving gear 6 that turns to input shaft to be connected, the second driving gear 6 drives the 3rd follower gear 7 rotations with its engagement.The number of teeth of the 3rd follower gear 7 is identical with the first follower gear 3, and because the second driving gear 6 is pressed clockwise hysteresis in the first driving gear 2 rotations, it is poor that the 3rd follower gear 7 and the first follower gear 3 produce relative angle.Metering circuit 5 is by sensing element 12a, 12b, it is poor poor with absolute angle that 12c measures relative angle, calculate to the poor proportional moment of torsion of relative angle and with the poor proportional angle position of absolute angle, and torque axis is turned to moment of torsion voltage signal, angle position is converted into angle position voltage signal, finally by telegraph circuit 18, exports.
Steering wheel return timing, the initial position of the first follower gear 3, the second follower gear 4 and the 3rd follower gear 7 is respectively α
30, α
40, α
70, bearing circle forwards angular position to, and the position of engaged wheel becomes α
3, α
4.The absolute angle of steering wheel angle position θ and follower gear 3, follower gear 4 is poor
relation as shown in the formula:
Wherein, Z represents the number of teeth of gear,
be the first driving gear 2 respectively with the gear ratio of the first follower gear 3 and the second follower gear 4, this example is
with
In like manner, when bearing circle forwards angular position to, the relation of the poor β of relative angle of the moment of torsion M that Torsion rod produces and the first follower gear 3, the 3rd follower gear 7 as shown in the formula:
Wherein, K
tfor the mechanical stiffness of torsion bar, in this example, the mechanical stiffness of torsion bar is 2.
As can be seen here, the gear ratio of the first driving gear 2 and the first follower gear 3, the second follower gear 4 and difference is larger between the two, measurable steering wheel angle scope is larger, and mechanical location skew, the chip error that the factors such as error cause of dispatching from the factory is down to when measuring torsion bar moment of torsion
thereby gear ratio is larger, error is less, and precision is higher.
Protection content of the present invention is not limited to above embodiment.Do not deviating under the spirit and scope of inventive concept, variation and advantage that those skilled in the art can expect are all included in the present invention, and take appending claims as protection domain.
Claims (10)
1. noncontact combined type moment of torsion and an angular position sensor, is characterized in that, comprising:
The driving gear assembly of coaxial rotating;
With the follower gear assembly of described driving gear assembly engagement, described follower gear assembly is rotated by described driving gear Component driver;
Be arranged on the metering circuit between described driving gear assembly; And
Be arranged on the detected element on described follower gear assembly,
Described detected element is via described follower gear assembly driven rotary, and described metering circuit is measured the anglec of rotation of described detected element, according to described anglec of rotation calculated torque and angle position.
2. noncontact combined type moment of torsion as claimed in claim 1 and angular position sensor, is characterized in that: described driving gear assembly comprises the first driving gear and the second driving gear; Described the first driving gear and described the second driving gear coaxially arrange.
3. noncontact combined type moment of torsion as claimed in claim 2 and angular position sensor, is characterized in that:
Described the first driving gear comprises the first main body, and the outer rim of described the first main body is provided with the first gear part, and the axle center of described the first main body is provided with the first hollow bulb, the first hollow posts body raising up around described the first hollow bulb setting; The inside surface of described the first hollow posts body is provided with outward extending the first rotor; The top of described hollow posts body is provided with a pair of deep-slotted chip breaker;
Described the second driving gear comprises the second main body, the outer rim of described the second main body is provided with the second gear part, the axle center of described the second main body is provided with the second hollow bulb, the the second hollow posts body raising up around described the second hollow bulb setting, the inside surface of described the second hollow posts body is provided with outward extending the second rotor, described the second main body is provided with boss, and described boss contacts with the top of described the first hollow posts body.
4. noncontact combined type moment of torsion as claimed in claim 3 and angular position sensor, is characterized in that: described the first main body is identical with described the second main body, and described the first gear part is identical with the number of teeth of described the second gear part.
5. noncontact combined type moment of torsion as claimed in claim 1 and angular position sensor, is characterized in that: described follower gear assembly comprises at least 2 follower gears; Described follower gear comprise follower gear portion and with the fixing linkage portion of described follower gear portion; Described follower gear portion and the engagement of described driving gear assembly, and with described driving gear assembly rotation; In described linkage portion, be provided with described detected element.
6. noncontact combined type moment of torsion as claimed in claim 5 and angular position sensor, is characterized in that: described follower gear assembly comprises 3 follower gears: the first follower gear, the second follower gear and the 3rd follower gear; Described the first follower gear is different from the number of gears of described the second follower gear.
7. noncontact combined type moment of torsion as claimed in claim 1 and angular position sensor, is characterized in that: described metering circuit comprises circuit main body, at least one sensing element;
Described sensing element is arranged in described circuit main body; Described sensing element is measured the anglec of rotation of described detected element, by described circuit main body, calculates described moment of torsion and described angle position.
8. noncontact combined type moment of torsion as claimed in claim 7 and angular position sensor, is characterized in that: described sensing element is right against described detected element setting.
9. noncontact combined type moment of torsion as claimed in claim 1 and angular position sensor, is characterized in that: further comprise the telegraph circuit being connected with described metering circuit.
10. noncontact combined type moment of torsion as claimed in claim 1 and angular position sensor, is characterized in that: further comprise the housing being arranged on outside described driving gear assembly and described follower gear assembly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310461236.0A CN103528601A (en) | 2013-09-30 | 2013-09-30 | Non-contact compound torque and angle position sensor |
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| CN201310461236.0A CN103528601A (en) | 2013-09-30 | 2013-09-30 | Non-contact compound torque and angle position sensor |
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| CN201310461236.0A Pending CN103528601A (en) | 2013-09-30 | 2013-09-30 | Non-contact compound torque and angle position sensor |
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| CN103982623A (en) * | 2014-05-16 | 2014-08-13 | 江苏宇海环保设备有限公司 | Gear component |
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| CN107923803A (en) * | 2015-10-20 | 2018-04-17 | 伊格尔工业股份有限公司 | Contactless torque measuring method |
| CN109737994A (en) * | 2019-01-07 | 2019-05-10 | 上海自动化仪表有限公司 | The multiple circles absolute value encoder and measurement method of MODBUS-RTU |
| CN111845919A (en) * | 2020-07-03 | 2020-10-30 | 深圳怡丰自动化科技有限公司 | Steering wheel and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103983394A (en) * | 2014-05-09 | 2014-08-13 | 华东师范大学 | Torque sensor |
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| CN109737994A (en) * | 2019-01-07 | 2019-05-10 | 上海自动化仪表有限公司 | The multiple circles absolute value encoder and measurement method of MODBUS-RTU |
| CN111845919A (en) * | 2020-07-03 | 2020-10-30 | 深圳怡丰自动化科技有限公司 | Steering wheel and control method thereof |
| CN111845919B (en) * | 2020-07-03 | 2023-09-01 | 深圳怡丰自动化科技有限公司 | Steering wheel and control method thereof |
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Application publication date: 20140122 |