CN1369695A - Photoelectric torque sensor for vehicle - Google Patents
Photoelectric torque sensor for vehicle Download PDFInfo
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- CN1369695A CN1369695A CN 02116308 CN02116308A CN1369695A CN 1369695 A CN1369695 A CN 1369695A CN 02116308 CN02116308 CN 02116308 CN 02116308 A CN02116308 A CN 02116308A CN 1369695 A CN1369695 A CN 1369695A
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Abstract
A torque transducer in photoelectric type for vehicle belonging to special electronic equipment of transport vehicle is a photoelectric torque transducer in non-contacting type, which mainly composes of two photoelectric cells, a light-transparent arm with light-transparent hole and a light barrier arm with light-uiding hole, luminous diode, torsion bar and pencil of conducting line. The light transparent arm and light barrier arm are fixed at two ends of torsion bar separately, the photoelectric cell and luminous diode will be placed at outer side of light-transparent arm and light barrier arm separately and the conducting wires of photoelectric cell and luminous diode will be connected with outside through winding box. The invented transducer has simple structure, high accuracy measurement and no limitative of measuring range and it is especially good for measurement of steering torque in power-assisted steering system.
Description
Technical field
The invention belongs to haulage vehicle special electronic equipment technical field, particularly the structural design of the photoelectric torque sensor in the electric boosting steering system is a kind of non-contact type photoelectricity torque sensor.
Technical background
Automobile electric booster steering system (EPS) the special photoelectric formula torque sensor that Britain's Lucas (Lucas) company released in 1992 has characteristics such as Electro Magnetic Compatibility is good, antijamming capability is strong.The structure of this sensor mainly is made up of torsion bar 6, light source 4, code- disc 2 and 3, photoelectric commutator 1 and 1 ' etc. as shown in Figure 1.Code- disc 2 and 3 is separately fixed at the two ends of torsion bar 6, light source 4 is arranged in the outside of code- disc 2 and 3 with photoelectric commutator 1 and 1 ', and is fixed on the housing, and two circle light-conductive hole and shading regions are along the circumferential direction all arranged on each code-disc, shown in Fig. 2 a and Fig. 2 b, the two arranged alternate.On the code-disc 2 two circle light hole differs a phasing degree (Fig. 2 a), the circle of two on the code-disc 3 light hole phase place identical (Fig. 2 b).Pass two circle light holes of code- disc 3 and 2 from the light of light source 4, project respectively on photoelectric commutator 1 and 1 '.The degree of overlapping of two circle light holes changes with the relative rotation at torsion bar 6 two ends on the code- disc 2 and 3, thereby is also changed by the output voltage that photoelectric commutator 1 and 1 ' converts to thereupon.This output voltage can not be affected owing to code- disc 2 and 3 rotations with it, only changes with the torque that acts on the torsion bar 6.
There are the following problems for this sensor:
One, two code- discs 2 and 3 respectively are provided with the light hole of several equidistant equiphases or staggered phase place, thereby quite high to dimensional accuracy, form accuracy and the position accuracy demand of two circle light holes, make the machining expense of code-disc and associated components exceed the expense of used electron device far away.
Its two, the precision of this sensor is about 10%, so low precision is difficult to improve the controlling level of electric boosting steering system (EPS) system.
Summary of the invention
The objective of the invention is to propose a kind of photoelectric torque sensor for vehicle simple in structure, with low cost, that measuring accuracy is higher that has in order to overcome the weak point of prior art.
The present invention is achieved through the following technical solutions: a kind of photoelectric torque sensor for vehicle, mainly forms by light source, photoelectric commutator, torsion bar and the code-disc that is installed in the torsion bar two ends, and it is characterized in that: light emitting diode of described light source employing; Described photoelectric commutator adopts two photoelectric cells; Described code-disc adopts a printing opacity arm and the arm that is in the light that has light-conductive hole that has light hole; Described light emitting diode is aimed at the light-conductive hole of the arm that is in the light, and is installed in the outside of the arm that is in the light, and with the arm left rotation and right rotation that is in the light; Described two photoelectric cells are fixed on the lateral surface of printing opacity arm light hole.
Feature of the present invention is that also the lead of described two photoelectric cells and a light emitting diode accumulates a wire harness, and described wire harness coiling line is placed in the Wiinding cartridge.
The area of light hole is the twice of light-conductive hole area on the arm of being in the light on the described printing opacity arm, or the two area equates.
The fan-shaped light hole of described printing opacity arm has the side by side left and right or upper and lower two kinds of arrangements that stagger, no gap or gapped between two light holes.
Described two photoelectric cells are square or rectangular, and be arranged side by side or arrange up and down, no gap or gapped between two photoelectric cells, and corresponding one by one with the layout of the fan-shaped light hole of printing opacity arm.
The area of fan-shaped light hole is in two scopes that photoelectric cell contained on the described printing opacity arm.
The present invention compared with prior art, have the following advantages: owing to have one or two fan-shaped light hole on the printing opacity arm, the arm that is in the light has only a fan-shaped light-conductive hole, thereby compared with the code-disc that has two several light holes of circle in the prior art, simple in structure, easily guarantee the size and dimension precision, so with low cost.In addition, light emitting diode is constant with the relative position of the arm light-conductive hole that is in the light, be that the light intensity that light emitting diode is radiated at the light-conductive hole sectorial area is stable, and light source 4 is fixed on the housing with photoelectric commutator 1 and 1 ' in the prior art, when two code- discs 3 and 2 relatively rotate, light source 4 is incident upon that the light intensity on the light hole sectorial area changes on the code-disc, and mismachining tolerance because of each light hole sectorial area, when two code-discs rotate together, increased the unevenness of light distribution, so photoelectric torque sensor for vehicle of the present invention has effectively overcome the not high defective of measuring accuracy in the prior art.For the car about weight on front axle 1000kg, the measurement range of torque is 0～10Nm, and measuring accuracy can reach 2～3%, and the linearity is 2～3%.The present invention be suitable for the haulage vehicle torque measurement, be particularly suitable for rotating the torque measurement of the electric boosting steering system that the number of turns is limited, velocity of rotation is lower.
Description of drawings
Fig. 1 is the structural representation of existing a kind of photoelectric torque sensor for vehicle.
Fig. 2 a is the structural representation of Fig. 1 code-disc 2.
Fig. 2 b is the structural representation of Fig. 1 code-disc 3.
Fig. 3 is the structural representation of a kind of photoelectric torque sensor for vehicle embodiment of the present invention.
Fig. 4 a and Fig. 4 b are the synoptic diagram of photoelectric cell 1 of the present invention and the about 1 ' arrangements.
Fig. 4 c and Fig. 4 d are the photoelectric cell 1 of the present invention and 1 ' synoptic diagram of arrangement up and down.
Fig. 5 a and Fig. 5 b have the structural representation of the printing opacity arm of light hole for the present invention.
Fig. 6 a and Fig. 6 b have the structural representation of the arm that is in the light of light-conductive hole for the present invention.
Fig. 7 a arranges and be in the light centre position synoptic diagram after the arm combination of a type printing opacity arm and a ' type for photoelectric cell 1 of the present invention and about 1 '.
Fig. 7 b turns clockwise+position view behind the θ for the relative printing opacity arm of arm that is in the light among Fig. 7 a of the present invention.
Fig. 8 a arranges up and down and b type printing opacity arm and b ' the type centre position synoptic diagram of arm after making up that be in the light for photoelectric cell 1 of the present invention and 1 '.
Fig. 8 b turns clockwise+position view behind the θ for the relative printing opacity arm of arm that is in the light among Fig. 8 a of the present invention.
Fig. 9 is the synoptic diagram of wire harness coiling line in the embodiment of the invention.
Figure 10 is the characteristic synoptic diagram of the embodiment of the invention.
Figure 11 is the synoptic diagram of photoelectric torque sensor for vehicle embodiment general structure of the present invention.
Embodiment
Describe content of the present invention in detail below in conjunction with drawings and Examples.
A kind of photoelectric torque sensor for vehicle (as shown in Figure 3) of the present invention's design mainly is made of photoelectric cell 1 and 1 ', printing opacity arm 2 and the arm 3 that is in the light, light emitting diode 4, wire harness 5 and torsion bar 6.The printing opacity arm 2 and the arm 3 that is in the light are separately fixed at the two ends of torsion bar 6, and two photoelectric cells 1 and 1 ' are fixed on the outer surface of printing opacity arm 2, and light emitting diode 4 is aimed at the light-conductive hole of the arm 3 that is in the light, and is installed in the outside of the arm 3 that is in the light, and can be with rotation therewith.
Light hole 7 (Fig. 5 a and Fig. 5 b) is arranged on the printing opacity arm 2, light-conductive hole 7 ' (Fig. 6 a and Fig. 6 b) is arranged on the arm 3 that is in the light, and on the printing opacity arm 2 area of light hole 7 be in the light light-conductive hole 7 ' area on the arm 3 twice (Fig. 5 a and Fig. 6 a) or the two equate (Fig. 5 b and Fig. 6 b).After the symmetrical center line of the printing opacity arm 2 and the arm 3 that is in the light overlaps, be installed to the two ends of torsion bar 6.
Principle of work of the present invention is as follows:
When torsion bar 6 produced relative rotation θ under external load function, photoelectric cell 1 on the printing opacity arm 2 and 1 ' light-receiving area changed (increase, another minimizing), and the short-circuit current of photoelectric cell 1 and 1 ' output also changes thereupon.The rotational angle theta of difference and the external applied load or the torsion bar 6 of the short-circuit current of photoelectric cell 1 and 1 ' output is in direct ratio, and with the together irrelevant to rotation of printing opacity arm 2 with the arm 3 that is in the light, this sensor characteristic curve (becoming voltage by current conversion) is as shown in figure 10.When light emitting diode 4, photoelectric cell 1 and 1 ' together rotated (about 2 circles), wire harness 5 took up in Wiinding cartridge or loosens.
The photoelectric cell 1 and 1 ' that the present invention proposes is square or rectangular, and two kinds of arrangements are arranged:
About arrange: the square or rectangular photoelectric cell 1 and 1 ' of two standards is arranged side by side, and does not stay the gap between the two or leaves certain clearance (Fig. 4 a and Fig. 4 b).
Arrange up and down: the square or rectangular photoelectric cell 1 and 1 ' of two standards arranges up and down, do not stay the gap or leave certain clearance between about the two, but about must be staggeredly arranged (Fig. 4 c and Fig. 4 d).
The area that photoelectric cell 1 and 1 ' is accepted light is subjected to the restriction of light hole 7 and light-conductive hole 7 ' on the printing opacity arm 2 and the arm 3 that is in the light.
The printing opacity arm that the present invention proposes has the structure of two kinds of light holes:
A type printing opacity arm: shown in Fig. 5 a, it is that the fan-shaped light hole 7 of 2S is distributed on the annulus of (r1-r2) that an area is arranged on the printing opacity arm, about arrange.
B type printing opacity arm: shown in Fig. 5 b, it is that the fan-shaped light hole 7 of S is distributed in respectively on (r1-r2) and two annulus (r2-r3) that two areas are arranged on the printing opacity arm, and is staggeredly arranged up and down.
The arm that is in the light that the present invention proposes also has the structure of two kinds of light-conductive holes:
A ' the type arm that is in the light: shown in Fig. 6 a, it is the fan-shaped light-conductive hole 7 ' of S that an area is arranged on the arm that is in the light, and is distributed on the annulus of (r1-r2).
B ' the type arm that is in the light: shown in Fig. 6 b, it is the fan-shaped light-conductive hole 7 ' of 2S that an area is arranged on the arm that is in the light, and is distributed on the annulus of (r1-r3).
The present invention proposes two kinds of array modes on the basis of the arm that is in the light of the printing opacity arm of above-mentioned two kinds of photronic arrangements, two kinds of light holes and two kinds of light-conductive holes:
A ' a type combination: a ' type be in the light arm be placed on a type printing opacity arm above, and the symmetrical center line of the two is coincided, shown in Fig. 7 a.Be characterized in that a ' the type arm area that is in the light is that the light-conductive hole 7 ' of S is that each retaining of light hole about 7 of 2S goes half (Fig. 7 a profile line part) with a type printing opacity arm area.If with this as the centre position, when a ' type be in the light the relative a type of arm printing opacity arm turn clockwise+during the θ angle, then half of a type printing opacity arm right side light hole 7 (area is S) all opened, and left side light hole 7 half (area is S) is blocked (Fig. 7 b) entirely.In like manner, when a ' type be in the light the relative a type of arm printing opacity arm be rotated counterclockwise-during the θ angle, half of a type printing opacity arm left side light hole 7 all opened, and half of right side light hole 7 is blocked (not shown) entirely.
B ' b type combination: b ' type be in the light arm be placed on b type printing opacity arm above, and the symmetrical center line of the two is coincided, shown in Fig. 8 a.Be characterized in b ' type be in the light the arm area be 2S light-conductive hole 7 ' with b type printing opacity arm area be 2S light hole 7 up and down each retaining go half (Fig. 8 a profile line part).If with this as the centre position, when b ' type be in the light the relative b type of arm printing opacity arm turn clockwise+during the θ angle, then b ' the type arm light-conductive hole 7 ' that is in the light is all opened (Fig. 8 b) with b type printing opacity arm lower right light hole 7, and upper left side light hole 7 is blocked entirely.On the contrary, when b ' type be in the light the relative b type of arm printing opacity arm be rotated counterclockwise-during the θ angle, then the be in the light light-conductive hole 7 ' of arm of b ' type is all opened b type printing opacity arm upper left side light hole 7, and b type printing opacity arm lower right side light hole 7 is blocked (not shown) entirely.Cross spider zone among Fig. 8 a and Fig. 8 b is the part that the light-conductive hole 7 ' of arm blocked by the printing opacity arm that is in the light.
From above-mentioned two kinds combination as can be known: as fixing the photoelectric cell 1 and 1 ' that two areas are not less than S at the light hole 7 of printing opacity arm 2 (a type or b type), the area that is fan-shaped light hole on the described printing opacity arm is in two scopes that photoelectric cell contained, then the light of being launched by light emitting diode 4 is radiated on photoelectric cell 1 and 1 ' by the light-conductive hole 7 ' on the arm 3 that is in the light (a ' type or b ' type), just can obtain the photoelectricity torque sensor with differential characteristic as shown in figure 10.Dot-and-dash line among Fig. 7 a, 7b, 8a and the 8b is the fixed position of photoelectric cell 1 and 1 '.
Among the present invention, photoelectric cell 1 and 1 ' output current convert the signal wire and the light emitting diode 4 input voltage electrical power source lines of voltage to, do not need to be connected with extraneous by special device (restrictor ring with contactor etc.), but the two lead is accumulated single line bundle 5, along circumferencial direction coiling line (Fig. 9) in Wiinding cartridge, and be delivered directly to outside.
Embodiment
The present invention has designed a kind of car electric power steering (EPS) system photoelectric torque sensor, and concrete structure as shown in figure 11.
Present embodiment has adopted a ' a type array mode: two photoelectric cells 1 and 1 ' are fixed on along the circumferential direction on the lateral surface of light hole of a type printing opacity arm 2 abreast; The be in the light light-conductive hole of arm 3 of a ' types of aiming at light emitting diode 4 is fixed on the sleeve 8.The printing opacity arm 2 and the arm 3 that is in the light are installed in the inner of output shaft 17 and sleeve 8 respectively, and the outer end of sleeve 8 is pressed in the inner of input shaft 11, and are fixed together with pin 14 and 13 two ends with output shaft 17 and sleeve 8 and torsion bar 6 respectively.Photoelectric cell 1 and 1 ' and the lead of light emitting diode 4 links to each other with the external world by Wiinding cartridge 5.
Under the effect of external applied load, when input shaft 11 relative output shafts 17 produced relative rotation θ, printing opacity arm 2 also produced relative displacement with the arm 3 that is in the light, and has changed the light-receiving area of light hole, and then has changed photronic output short circuit current.This output quantity has been reacted the size and the direction of torque, and its family curve (becoming voltage by current conversion) as shown in figure 10.
When printing opacity arm 2 be in the light arm 3 together when a certain direction is rotated about two circles, the wire harness of light emitting diode 4 and photoelectric cell 1 and 1 ' takes up in Wiinding cartridge 5 or loosens.
The torque measurement scope of present embodiment is 0～10Nm, measuring accuracy 3%, and the linearity is 3%, is applicable to the torque measurement of weight on front axle 1000kg left and right sides car electric boosting steering system.
Claims (7)
1, a kind of photoelectric torque sensor for vehicle mainly is made up of light source, photoelectric commutator, torsion bar and the code-disc that is installed in the torsion bar two ends, it is characterized in that: light emitting diode of described light source employing; Described photoelectric commutator adopts two photoelectric cells; Described code-disc adopts a printing opacity arm and the arm that is in the light that has light-conductive hole that has light hole; Described light emitting diode is aimed at the light-conductive hole of the arm that is in the light, and is installed in the outside of the arm that is in the light, and with the arm left rotation and right rotation that is in the light; Described two photoelectric cells are fixed on the lateral surface of printing opacity arm light hole.
2, according to the described photoelectric torque sensor for vehicle of claim 1, it is characterized in that: the lead of described two photoelectric cells and a light emitting diode accumulates a wire harness, and described wire harness coiling line is placed in the Wiinding cartridge.
3, according to the described photoelectric torque sensor for vehicle of claim 1, it is characterized in that: have one or two fan-shaped light hole on the described printing opacity arm; The described arm that is in the light has a fan-shaped light-conductive hole.
4, according to the described photoelectric torque sensor for vehicle of claim 3, it is characterized in that: the area of light hole is the twice of light-conductive hole area on the arm of being in the light on the described printing opacity arm, or the two area equates.
5, according to the described photoelectric torque sensor for vehicle of claim 1-4, it is characterized in that: the fan-shaped light hole of described printing opacity arm has the side by side left and right or upper and lower two kinds of arrangements that stagger, no gap or gapped between two light holes.
6, according to the described photoelectric torque sensor for vehicle of claim 5, it is characterized in that: described two photoelectric cells are square or rectangular, be arranged side by side or arrange up and down, no gap or gapped between two photoelectric cells, and corresponding one by one with the layout of the fan-shaped light hole of printing opacity arm.
7, according to claim 1,3 or 4 described photoelectric torque sensor for vehicle, it is characterized in that: the area of fan-shaped light hole is in two scopes that photoelectric cell contained on the described printing opacity arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021163081A CN1156678C (en) | 2002-03-22 | 2002-03-22 | Photoelectric torque sensor for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021163081A CN1156678C (en) | 2002-03-22 | 2002-03-22 | Photoelectric torque sensor for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1369695A true CN1369695A (en) | 2002-09-18 |
| CN1156678C CN1156678C (en) | 2004-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021163081A Expired - Fee Related CN1156678C (en) | 2002-03-22 | 2002-03-22 | Photoelectric torque sensor for vehicle |
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| Country | Link |
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| CN (1) | CN1156678C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792034A (en) * | 2014-01-22 | 2014-05-14 | 中国矿业大学 | Axial differential type mine hoist spindle torque detecting device |
-
2002
- 2002-03-22 CN CNB021163081A patent/CN1156678C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792034A (en) * | 2014-01-22 | 2014-05-14 | 中国矿业大学 | Axial differential type mine hoist spindle torque detecting device |
| WO2015109716A1 (en) * | 2014-01-22 | 2015-07-30 | 中国矿业大学 | Axial differential mine hoist main shaft torque measurement device |
| CN103792034B (en) * | 2014-01-22 | 2016-06-29 | 中国矿业大学 | A kind of axial difference dynamic formula mine hoist main-shaft torque detecting device |
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| Publication number | Publication date |
|---|---|
| CN1156678C (en) | 2004-07-07 |
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Granted publication date: 20040707 Termination date: 20130322 |