CN100485307C - Rotational angle detector - Google Patents

Rotational angle detector Download PDF

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Publication number
CN100485307C
CN100485307C CNB2006101412536A CN200610141253A CN100485307C CN 100485307 C CN100485307 C CN 100485307C CN B2006101412536 A CNB2006101412536 A CN B2006101412536A CN 200610141253 A CN200610141253 A CN 200610141253A CN 100485307 C CN100485307 C CN 100485307C
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China
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detection
mentioned
detection bodies
bodies
rotation
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Expired - Fee Related
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CNB2006101412536A
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Chinese (zh)
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CN1952589A (en
Inventor
白发升三
马场裕介
富野泰范
大西贤英
野田宏充
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

A rotational angle detector has a rotary body, a first detecting unit rotating in cooperation with the rotary body, a second detecting unit rotating in cooperation with the first detecting unit, and an auxiliary detecting unit rotating in cooperation with the rotary body and the second detecting unit. The rotational angle detector has a first detecting element, a second detecting element, and a controller. The first detecting element detects rotation of the first detecting unit, and the second detecting element detects rotation of the second detecting unit. The controller detects a rotational angle of the rotary body based on a detection signal supplied from the first detecting element and a detection signal supplied from the second detecting element.

Description

Rotation angle detection apparatus
Technical field
The present invention relates to a kind of rotation angle detection apparatus, for example can be used for, the anglec of rotation of automobile steering mechanism detects.
Background technology
In recent years, the high performance of automobile is constantly progressive, thereby the anglec of rotation of using rotation angle detection apparatus to detect steering mechanism is carried out the vehicle of various controls and constantly increased.Below use Fig. 4 explanation rotation angle detection apparatus in the past.Fig. 4 is the exploded perspective view of the major part of rotation angle detection apparatus in the past.
Rotary body 21 has gear part 21A in periphery, has a linkage portion 21B who links of the steering mechanism's (not having diagram) that is used for and connects central authorities simultaneously.Detection bodies 22 has gear part 22A in periphery, and detection bodies 24 has gear part 24A in periphery.Gear part 22A and gear part 21A engagement.Gear part 24A and gear part 22A engagement.In the central authorities of detection bodies 22, the central authorities of detection bodies 24, magnet 23A, magnet 25A are installed respectively by embedding to be shaped to wait.The diameter of these gears and the number of teeth, rotary body 21 maximums, detection bodies 22, detection bodies 24 reduce in order.
Almost parallel be arranged on detection bodies 22,24 above the upper and lower surface of distribution printed circuit board (PCB) 28 on, form a plurality of Wiring patterns (not having diagram).In addition with respectively with magnet 23A, magnet 25A over against mode, magnetic detecting element 23B, 25B are installed on distribution printed circuit board (PCB) 28.In addition, distribution printed circuit board (PCB) 28 has the control part 29 that is made of electronic units such as microcomputers.Control part 29 links together with magnetic detecting element 23B, 25B.
As mentioned above, rotation angle detection apparatus constitutes by following parts: the 1st detecting element that is made of magnet 23A and magnetic detecting element 23B, the 2nd detecting element and the control part 29 that are made of magnet 25A and magnetic detecting element 25B.
Control part 29 waits the circuit (not having diagram) with automobile body to link together by web member (do not have diagram), and the axle perforation of steering mechanism is on the linkage portion 21B of rotary body 21.Thus, this rotation angle detection apparatus is installed on the automobile.
In above-mentioned structure, after the driver rotates steering mechanism when travelling, rotary body 21 rotations, thereby detection bodies 22 and rotary body 21 interlock rotations, thereby detection bodies 24 and detection bodies 22 interlock rotations.Magnet 23A, 25A also rotate along with these rotations. Magnetic detecting element 23B, 25B detect the magnetic field intensity of the variation of magnet 23A, 25A as the detection signal of being made of the voltage waveform of sine and cosine.These detection signals are transfused to control part 29 with jagged data waveform.Here, because the number of teeth of detection bodies 22 is different with the number of teeth of detection bodies 24, rotational speed is also different, so the detection signal of detection bodies 22 and detection bodies 24 is different and dephased data waveforms of mutual cycle.
Control part 29 is according to the computing of stipulating from two of magnetic detecting element 23B, 25B different detection signals and the number of teeth separately, thereby detects the anglec of rotation of rotary body 21.That is to say that control part 29 detects the anglec of rotation of steering mechanism.The electronic circuit of detected signal input automobile body, thus carry out the various controls of vehicle.This rotation angle detection apparatus for example spy open have in the 2005-3625 communique disclosed.
But in above-mentioned rotation angle detection apparatus in the past, if produced defective or breakage on detection bodies 22 or detection bodies 24, then control part 29 detects the wrong anglec of rotation according to the detection signal of magnetic detecting element 23B, 25B.In order to address this problem, will improve the intensity of detection bodies 22,24, make it to be difficult to produce defective or breakage, obtain long durable years, so just must increase detection bodies 22,24 or use high-intensity material.
Summary of the invention
Rotation angle detection apparatus of the present invention comprises: rotary body, and with rotary body interlock and the 1st detection bodies of rotation, the 2nd detection bodies of rotation and with rotary body and the interlock of the 2nd detection bodies and the auxiliary detection body of rotation with the interlock of the 1st detection bodies.In addition, rotation angle detection apparatus of the present invention also comprises: the 1st detecting element, the 2nd detecting element, and control part.The 1st detecting element detects the rotation of the 1st detection bodies, and the 2nd detecting element detects the rotation of the 2nd detection bodies.Control part is by from the detection signal of the 1st detecting element with detect the anglec of rotation of rotary body from the detection signal of the 2nd detecting element.In this simple structure, the 1st detection bodies, the 2nd detection bodies, these three detection bodies of auxiliary detection body link always and rotate, even therefore produce under the situation of some defectives or breakage in each detection bodies, control part also can correctly detect the anglec of rotation of rotary body.
Description of drawings
Fig. 1 is the exploded perspective view of major part that utilizes the rotation angle detection apparatus of embodiments of the present invention.
Fig. 2 is the sectional view of major part that utilizes the rotation angle detection apparatus of embodiments of the present invention.
Fig. 3 is the exploded perspective view of major part that utilizes other rotation angle detection apparatus of embodiments of the present invention.
Fig. 4 is the exploded perspective view of the major part of rotation angle detection apparatus in the past.
Embodiment
Fig. 1 is the exploded perspective view of major part that utilizes the rotation angle detection apparatus of embodiments of the present invention, and Fig. 2 is its sectional view.Utilize the rotation angle detection apparatus of present embodiment to comprise: rotary body 1, the 1 detection bodies 2 (hereinafter referred to as detection bodies 2), the 2nd detection bodies 4 (hereinafter referred to as detection bodies 4), auxiliary detection body 6 (hereinafter referred to as detection bodies 6) and distribution printed circuit board (PCB) 8.
Rotary body 1 has gear part 1A in periphery, has a linkage portion 1B who links of the steering mechanism's (not having diagram) that is used for and connects central authorities simultaneously.Detection bodies 2 has gear part 2A in periphery, and detection bodies 4 has gear part 4A in periphery.Detection bodies 6 has gear part 6A in periphery.Gear part 2A and gear part 1A engagement.Gear part 4A and gear part 2A engagement.Gear part 6 and gear part 1A, gear part 4A engagement.Rotary body 1, detection bodies 2,4,6 all are made of insulating resin or metal.The diameter of these gears and the number of teeth, rotary body 1 maximum, detection bodies 2 is identical with detection bodies 6, and detection bodies 4 is all littler than them.For example, the number of teeth of gear part 1A is 65, and gear part 2A and gear part 6A are 26, and gear part 4A is 25.
In the central authorities of detection bodies 2, the central authorities of detection bodies 4, the central authorities of detection bodies 6, by embedding to be shaped to wait the 1st magnet 3A (hereinafter referred to as magnet 3A), the 2nd magnet 5A (hereinafter referred to as magnet 5A), auxiliary magnet 7A (hereinafter referred to as magnet 7A) are installed respectively.Almost parallel be arranged on detection bodies 2,4,6 above the upper and lower surface of distribution printed circuit board (PCB) 8 on, be formed with a plurality of Wiring patterns (not having diagram).In addition with respectively with magnet 3A, 5A, 7A over against mode, magnetic detecting element 3B, 5B, 7B such as anisotropic magnetoresistive (AMR) element are installed on distribution printed circuit board (PCB) 8.Respectively by mutually over against magnet 3A and magnetic detecting element 3B form the 1st detecting element, form the 2nd detecting element by magnet 5A and magnetic detecting element 5B equally, form the auxiliary detection element by magnet 7A and magnetic detecting element 7B.
Distribution printed circuit board (PCB) 8 has the control part 10 that is made of electronic components such as microcomputers in addition.Control part 10 links together with magnetic detecting element 3B, 5B, 7B.
The 11A of tube portion, the 11B of tube portion, the insulating resin retainer 12 that are arranged at insulating resin housing 11 can keep detection bodies 2, auxiliary detection body 6, detection bodies 4 respectively rotatably.Retainer 12 is installed on the sliding tray 11C of the bottom surface of housing 11 movably.Housing 11 is provided with the hole in addition, and this hole is used to make the axle with the steering mechanism of the linkage portion 1B interlock of rotary body 1 to pass through.
Wire form springs 13 comprises: the central portion 13A that is reeling and from extended left part 13B of central portion 13A and right part 13C.13 one-tenth on spring is case of bending slightly, and central portion 13A inserts and remains on from the outstanding maintaining part 11D of housing 11.And left part 13B card ends on fastener 11E, simultaneously the contacts side surfaces of right part 13C and maintaining part 12.By this structure, spring 13 compresses (pushing) on detection bodies 2 and detection bodies 6 with detection bodies 4.That is to say that spring 13 is to be used for detection bodies 4 is pressed on elastic body on detection bodies 2 and the detection bodies 6.
By above structure, will with housing 11 over against reciprocity housing (do not have diagram) and housing 11 make up, just constituted the rotation angle detection apparatus of present embodiment.
Control part 10 waits the electronic circuit (not having diagram) with automobile body to link together by connector (do not have diagram), the linkage portion 1B that spool runs through rotary body 1 of steering mechanism's (not having diagram).Like this, this rotation angle detection apparatus just is installed on the automobile.
In above-mentioned structure, if in motion, i.e. under the state of left-hand tools angle detection device energising, the driver rotates steering mechanism, then rotary body 1 rotation.Detection bodies 2,4,6 is also rotated with rotary body 1 interlock.Be accompanied by the rotation of each detection bodies, magnet 3A, 5A, 7A also rotate.Magnetic detecting element 3B, 5B, 7B detect the magnetic field intensity of the variation of magnet 3A, 5A, 7A as the detection signal that the voltage waveform by sine and cosine constitutes.
These detection signals are transfused to control part 10 with jagged data waveform.The number of teeth of the number of teeth of detection bodies 2 and detection bodies 6 is identical and rotational speed is also identical, and is relative therewith, and the number of teeth difference of detection bodies 4 and rotational speed are also different.Therefore, the detection signal of detection bodies 4 is compared with detection bodies 2 and detection bodies 6, is different and dephased data waveform of cycle.
The computing that control part 10 is stipulated according to two different detection signals that obtain from detection bodies 2 and detection bodies 4 and the number of teeth separately, thus detect the anglec of rotation of rotary body 1.That is to say that control part 10 detects the anglec of rotation of steering mechanism.The electronic circuit of detected signal input automobile body, thus carry out the various controls of vehicle.The detailed method of the computing anglec of rotation is opened in the 2005-3625 communique open for example spy.
Detection bodies 6 and rotary body 1 and detection bodies 4 engagements.That is to say, constitute three detection bodies and rotate in linkage.Therefore, even just in case some defectives of some generations or breakage in each detection bodies, adjacent detection bodies also can be rotated in linkage.For example, even the part that is meshed with detection bodies 2 of detection bodies 4 produces defective, detection bodies 4 can be by the partial rotation that is meshed with detection bodies 6.And when the defect part of the mate of detection bodies 4 is meshed with detection bodies 6, the mate of flawless detection bodies 4 and detection bodies 2 engagements.
Like this, even produce in certain gear of each detection bodies under the situation of defective or breakage, their rotation also can be carried out always in linkage, thereby control part 10 can normally detect the anglec of rotation of rotary body 1.Therefore, will each detection bodies not form bigger shape, the perhaps special higher material of working strength.Like this, the rotation angle detection apparatus of present embodiment is the easy structure of only having added auxiliary detection body 6, does not need to form bigger shape.Therefore the rotation angle detection apparatus of present embodiment can use comparatively cheap material to constitute, and has long durable years.
In addition as mentioned above, magnet 7A and the magnetic detecting element 7B that is used to detect detection bodies 6 rotations preferably are set.Detect the poor of the detection signal that obtains from detecting element 3B, 7B by control part 10, control part 10 can detect up-set condition.For example, under the situation that produces the up-set condition that rotary body 1 and detection bodies 2 or rotary body 1 separate with detection bodies 6 etc., even the side's output detection signal from magnetic detecting element 3B, 7B, can output detection signal from the opposing party yet.Control part 10 can detect this up-set condition.Thereby can prevent to detect the wrong anglec of rotation effectively.
The detection signal that obtains from magnetic detecting element 5B, 7B of control part 10 and then preferred detection is poor in addition.Thus, even under the situation that detection bodies 2 is separated as mentioned above, thereby the detection signal from magnetic detecting element 7B that control part 10 also can obtain according to the rotation by detection bodies 6 detects the anglec of rotation of rotary body 1.
And then as mentioned above, preferably be provided as elastomeric spring 13.Spring 13 is pressed on detection bodies 4 on detection bodies 2 and the detection bodies 6 indirectly by pushing the retainer 12 that detection bodies 4 is installed.So,, can not produce error by this gap because the state that does not promptly have a backlash with the little gap of trying one's best between the gear of each detection bodies is rotated.Can detect the anglec of rotation accurately like this.
Next explanation being used for except that spring 13 is pressed on elastic body on detection bodies 2 and the detection bodies 6 with detection bodies 4.Fig. 3 is the exploded perspective view of major part of other rotation angle detection apparatus of embodiment of the present invention.
In this structure, housing 31 is provided with a 31A of portion, and the 31A of tube portion can keep detection bodies 4 rotatably.In addition, plate-shaped springs 33 is installed on the groove of the 31A of portion 34 with crooked slightly state.Spring 33 is pushed the side of the 4B of bearing portion of the lower face side of detection bodies 4 among Fig. 2, thereby detection bodies 4 is pressed on detection bodies 6 and the detection bodies 2.That is to say that spring 33 directly is pressed on detection bodies 4 on detection bodies 2 and the detection bodies 6.Detection bodies 4 only moves in the interstice coverage between the axle in the 4B of bearing portion of detection bodies 4 and the 31A of tube portion thus.Other structure is identical with Fig. 1.In this structure, spring 33 is identical with the effect that spring 13 is risen.
In addition, in the rotation angle detection apparatus of Fig. 1, Fig. 3, be formed with gear in the periphery of rotary body 1, detection bodies 2,4,6, but be not limited thereto.Except that gear, also can form the jog that can transmit rotation or high friction part etc. in the periphery of rotary body 1 and detection bodies 2,4,6, thus rotation in linkage mutually.
As mentioned above, rotation angle detection apparatus of the present invention can correctly detect the anglec of rotation, and while low price and simple structure are so reliability increases.This rotation angle detection apparatus can be used for the anglec of rotation detection of automobile steering mechanism etc.

Claims (4)

1. a rotation angle detection apparatus is characterized in that, comprising:
Rotary body;
Contact and the 1st detection bodies of rotation with above-mentioned rotary body with above-mentioned rotary body interlock;
The 2nd detection bodies of leaving with above-mentioned rotary body, contacting and rotate with the rotational speed different with above-mentioned the 1st detection bodies with above-mentioned the 1st detection bodies interlock with above-mentioned the 1st detection bodies;
Contact with above-mentioned the 2nd detection bodies with above-mentioned rotary body and with above-mentioned rotary body and the interlock of above-mentioned the 2nd detection bodies and the auxiliary detection body of rotation; With
Only by the 1st detecting element of the rotation that detects above-mentioned the 1st detection bodies with detect the detecting element group that the 2nd detecting element of the rotation of above-mentioned the 2nd detection bodies constitutes;
According to from the detection signal of above-mentioned the 1st detecting element with detect the control part of the anglec of rotation of above-mentioned rotary body from the detection signal of above-mentioned the 2nd detecting element.
2. rotation angle detection apparatus as claimed in claim 1 is characterized in that:
Also comprise the auxiliary detection element that detects above-mentioned auxiliary detection body rotation;
Above-mentioned control part detects on a certain side of above-mentioned the 1st detection bodies and above-mentioned auxiliary detection body and has produced undesired situation according to from poor with from the detection signal of above-mentioned the 1st detecting element of the detection signal of above-mentioned auxiliary detection element.
3. rotation angle detection apparatus as claimed in claim 2 is characterized in that:
Above-mentioned control part is detecting when having produced undesired situation on above-mentioned the 1st detection bodies, according to from the detection signal of above-mentioned auxiliary detection element with detect the anglec of rotation of above-mentioned rotary body from the detection signal of above-mentioned the 2nd detecting element.
4. rotation angle detection apparatus as claimed in claim 1 is characterized in that:
Also comprise and be used for above-mentioned the 2nd detection bodies is pressed on elastic body on above-mentioned the 1st detection bodies and the above-mentioned auxiliary detection body.
CNB2006101412536A 2005-10-20 2006-09-29 Rotational angle detector Expired - Fee Related CN100485307C (en)

Applications Claiming Priority (3)

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JP2005305490 2005-10-20
JP305490/2005 2005-10-20
JP101753/2006 2006-04-03

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CN100485307C true CN100485307C (en) 2009-05-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103038607A (en) * 2010-06-23 2013-04-10 利奥波德·科世达责任有限股份公司 Angle sensor
CN103261843A (en) * 2010-12-22 2013-08-21 罗伯特·博世有限公司 Angle sensor, gear wheel for angle sensor and method for producing such gear wheel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009018893A1 (en) * 2009-04-24 2010-10-28 Leopold Kostal Gmbh & Co. Kg angle sensor
CN101975549B (en) * 2010-10-15 2012-05-23 昌辉汽车电气系统（安徽）有限公司 Oversized range absolute position angular transducer and angular detection method of absolute position
CN103786773B (en) * 2012-10-30 2016-02-03 重庆长安汽车股份有限公司 A kind of mounting structure of corner of vehicle steering wheel sensor
JP6357660B2 (en) * 2015-01-05 2018-07-18 パナソニックＩｐマネジメント株式会社 Rotation angle detection device and rotation angle detection unit using the same
DE102016115310A1 (en) * 2016-08-18 2018-02-22 Valeo Schalter Und Sensoren Gmbh Sensor system for determining an absolute angle of rotation of a shaft, method for determining an absolute angle of rotation of a shaft and vehicle with a sensor system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103038607A (en) * 2010-06-23 2013-04-10 利奥波德·科世达责任有限股份公司 Angle sensor
CN103038607B (en) * 2010-06-23 2015-09-23 利奥波德·科世达责任有限股份公司 Angular transducer
CN103261843A (en) * 2010-12-22 2013-08-21 罗伯特·博世有限公司 Angle sensor, gear wheel for angle sensor and method for producing such gear wheel
CN103261843B (en) * 2010-12-22 2016-01-27 罗伯特·博世有限公司 Angular transducer, for the gear of angular transducer and the method for the manufacture of such gear
US9513102B2 (en) 2010-12-22 2016-12-06 Robert Bosch Gmbh Angle sensor, gear wheel for an angle sensor and method for producing such a gear wheel

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