New energy vehicle angular displacement sensor

Abstract

The utility model provides a new energy vehicle angular displacement sensor, and relates to the field of angular displacement sensors. The angular displacement sensor for the new energy vehicle comprises a shell which is internally provided with a partition plate, and the partition plate divides the interior of the shell into a first cavity and a second cavity; a first light source and a first receiving assembly are arranged in the first cavity; a second light source and a second receiving assembly are arranged in the second cavity; the rotating shaft is rotatably arranged in the shell in a penetrating manner; the grating module comprises a first grating disc and a second grating disc; the first grating disc is arranged in the first cavity; the second grating disc is arranged in the second cavity; wherein the first grating disc and the second grating disc are connected with the rotating shaft; when the rotating shaft rotates, the first grating disc and the second grating disc can be synchronously driven to rotate, so that angular displacement signals are sent to the first receiving assembly and the second receiving assembly; the angular displacement sensor provided by the utility model has higher accuracy and stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of angular displacement sensor, concretely to a new energy vehicle angular displacement sensor. BACKGROUND

[0002] Angular displacement sensor is widely used in new energy vehicles, especially in motor control system, steering system and wheel positioning and suspension system, the high precision and high reliability of angular displacement sensor make it one of the indispensable sensors of modern vehicles. Angular displacement sensor adopts non-contact design, compared with other traditional angular displacement measuring instruments such as synchronous analyzer and potentiometer, the long-term reliability is effectively improved. Its unique design can still ensure the measurement accuracy without using movable parts such as slip ring, vane, contact vernier and brush.

[0003] The existing angular displacement sensor mainly has a hall sensor, the hall sensor detects angular displacement based on magnetic field change, has simple structure and low cost, but is susceptible to external magnetic field interference, temperature stability is insufficient, and resolution is usually limited, especially in high-precision occasions, it may not be applicable. Optical sensors have certain advantages in these aspects, the optical sensor of the prior art mainly has an encoder, such as an absolute encoder, an incremental encoder, and a grating, or a structure of a photodiode cooperating with a code disc. Usually, LED light source can be used, the change of light is detected by photoelectric detector through grating or reflective code disc, and then the angle is calculated. In addition, the absolute encoder can use multiple code channels, each code channel corresponds to different binary bits, and the absolute position is directly read. Alternatively, the incremental encoder can determine the position by counting pulses. However, the optical angular displacement sensor is susceptible to dust and impurities in the air when working for a long time in a complex and harsh environment, which can cause large measurement error. UTILITY MODEL CONTENTS

[0004] The utility model discloses to solve the problem that the optical angular displacement sensor of prior art is susceptible to dust and impurities in the air in a complex and harsh environment, which can cause large measurement error, and provides a new energy vehicle angular displacement sensor that can adapt to complex and harsh driving environment and reduce the influence of dust and pollution in the air on the detection result of the angular displacement sensor.

[0005] The utility model adopts the technical scheme of:

[0006] A new energy vehicle angular displacement sensor comprises:

[0007] A shell is provided with a partition plate inside, the partition plate divides the inside of the shell into a first chamber and a second chamber, a first light source and a first receiving assembly are arranged in the first chamber, a second light source and a second receiving assembly are arranged in the second chamber,

[0008] a rotating shaft, which is arranged to rotate in the housing; and

[0009] a grating module, which comprises a first grating disc and a second grating disc; the first grating disc is arranged in the first chamber; the second grating disc is arranged in the second chamber;

[0010] The first grating disc and the second grating disc are both connected with the rotating shaft; when the rotating shaft rotates, the first grating disc and the second grating disc can be synchronously driven to rotate, thereby emitting an angular displacement signal to the first receiving assembly and the second receiving assembly.

[0011] Further, a first mounting hole is arranged on one side of the housing; a mounting groove is arranged inside the other side of the housing opposite to the first mounting hole; a second mounting hole is arranged on the partition plate; the rotating shaft is arranged in sequence through the first mounting hole and the second mounting hole; and an end of the rotating shaft extending into the housing is arranged in the mounting groove.

[0012] Further, the rotating shaft is respectively arranged with a first bearing, a second bearing and a third bearing between the first mounting hole, the second mounting hole and the mounting groove.

[0013] Further, the rotating shaft is respectively arranged with a first shaft sleeve, a second shaft sleeve and a third shaft sleeve between the first bearing, the second bearing and the third bearing and the inner ring of the first bearing, the second bearing and the third bearing.

[0014] Further, an end cover is detachably arranged on the housing and located on the side where the first mounting hole is arranged.

[0015] Further, the application further comprises:

[0016] a difference warning module, which is arranged outside the housing; the difference warning module is electrically connected with the first receiving assembly and the second receiving assembly, and can emit a warning signal according to the difference value of the angular displacement signals fed back by the first receiving assembly and the second receiving assembly.

[0017] Further, the first light source and the second light source are respectively arranged inside the two opposite side walls of the housing; the first receiving assembly and the second receiving assembly are respectively arranged on the two sides of the partition plate; and the first receiving assembly and the second receiving assembly are both electrically connected with the signal processing assembly.

[0018] Further, the first receiving assembly and the second receiving assembly both comprise a fixed grating and a linear array CMOS sensing element.

[0019] Further, the first light source and the second light source both comprise a plurality of infrared pulse LED light sources.

[0020] Further, the infrared pulse LED light source is externally provided with a collimating lens.

[0021] The utility model discloses the beneficial effect is:

[0022] 1. The utility model discloses a shell is provided with the baffle in, and the first chamber and second chamber are separated, then set up two groups of light source module in the first chamber and second chamber respectively, grating module and photoelectric receiving module, and the rotation of two groups of grating modules is driven by a pivot, realize multiple module compound detection, avoid the detection error of single detection module affected by dust, strengthen the anti -interference ability of angular displacement sensor, solve the problem that the optical angular displacement sensor in the prior art is easily affected by dust and impurity in the air in the complex bad environment, leads to the problem of big measurement result error,

[0023] 2. The utility model discloses still set up photoelectric receiving module's first receiving subassembly and second receiving subassembly on the baffle simultaneously, make two with same signal processing subassembly electricity be connected, share same signal processing subassembly to reduce the cost of electric element. DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiment of the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is the three-dimensional schematic view of the sensor of the utility model embodiment;

[0026] Figure 2 It is the three-dimensional perspective view of the sensor of the utility model embodiment;

[0027] Figure 3 It is the section view of the sensor of the utility model embodiment;

[0028] Figure 4 It is the section view of the shell of the utility model embodiment.

[0029] Sign significance: 100 - shell, 102 - installation slot, 110 - first chamber, 120 - second chamber, 130 - baffle, 132 - second mounting hole, 140 - end cover, 142 - first mounting hole, 150 - lug;

[0030] 200 - pivot, 210 - first shaft sleeve, 212 - first bearing, 220 - second shaft sleeve, 222 - second bearing, 230 - third shaft sleeve, 232 - third bearing;

[0031] 300 - light source module, 310 - first light source, 320 - second light source;

[0032] 400 - grating module, 410 - first grating disc, 420 - second grating disc;

[0033] 500 - photoelectric receiving module, 510 - first receiving assembly, 512 - first fixed grating, 514 - first linear array CMOS sensing element, 520 - second receiving assembly, 522 - second fixed grating, 524 - second linear array CMOS sensing element. DETAILED DESCRIPTION

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0036] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] The commonly used angular displacement sensor includes a Hall angular displacement sensor, which is an angular displacement sensor that detects angular displacement by magnetic field change. However, the Hall sensor is very susceptible to external magnetic field sources, and the temperature stability is also poor, which may cause the measured current reading to be distorted. In addition, there are angular displacement sensors that use optical principles, but optical angular displacement sensors are easily affected by dust and impurities in the air when used for a long time in complex and harsh environments, which may also cause the measurement result to have a large error.

[0039] In order to solve the problems of the angular displacement sensor in the prior art, the embodiment provides a new energy vehicle angular displacement sensor, which can be applied to the motor control system, steering system, wheel positioning or suspension system of a new energy vehicle, and can perform real-time detection and feedback of angular displacement. The new energy vehicle angular displacement sensor can adapt to complex and harsh driving environments, and reduce the influence of dust and pollution in the air on the detection results of the angular displacement sensor. At the same time, the new energy vehicle angular displacement sensor of the embodiment measures the angular displacement by using the optical principle, which has the advantages of not being easily disturbed by the magnetic field source and high temperature stability compared with the Hall sensor. Please refer to Figures 1-4 The new energy vehicle angular displacement sensor mainly includes a shell 100, a rotating shaft 200, a light source module 300, a grating module 400, and a photoelectric receiving module 500.

[0040] The shell 100 is the external protection and shielding structure of the new energy vehicle angular displacement sensor of the embodiment. As shown in Figure 3 、 Figure 4 , the shell 100 is approximately in the form of a cylindrical barrel structure, the inside of the shell 100 is hollow, and a partition plate 130 is arranged in the inside of the shell 100, the partition plate 130 is arranged perpendicular to the axial direction of the shell 100 and is located at the middle position in the shell 100, and the inside of the shell 100 is divided into a first chamber 110 and a second chamber 120; and the middle part of the partition plate 130 is provided with a second mounting hole 132 for passing through the rotating shaft 200. At the same time, an end cover 140 is arranged on the end of the shell 100 close to the first chamber 110, the middle part of the end cover 140 is provided with a first mounting hole 142 for passing through the rotating shaft 200, and the end cover 140 and the partition plate 130 are designed to be detachable, so that when there is dust or impurities in the inside of the sensor, the first chamber 110 and the second chamber 120 in the inside of the shell 100 can be conveniently opened for cleaning. Furthermore, an installation groove 102 is arranged in the inside of the end of the shell 100 close to the second chamber 120 for arranging the rotating shaft 200; a protrusion 150 is arranged on the outside of the shell 100 corresponding to the installation groove 102, and the protrusion 150 is used for abutting to the external mounting plate to install and fix the detection position of the new energy vehicle angular displacement sensor of the embodiment on the new energy vehicle.

[0041] The rotating shaft 200 is used to transmit the change of the angular displacement of the detection object outside the shell 100 to the grating module 400. The rotating shaft 200 is rotatably arranged in the shell 100, and one end of the rotating shaft 200 extends outside the shell 100 and is used to connect the external detection object. The middle part of the rotating shaft 200 is sleeved with a first shaft sleeve 210 and a second shaft sleeve 220, the first shaft sleeve 210 and the second shaft sleeve 220 are respectively embedded in the inner rings of a first bearing 212 and a second bearing, and are rotatably arranged in a first mounting hole 142 and a second mounting hole 132 of the shell 100 through the first bearing 212 and the second bearing 222. The end of the rotating shaft 200 extending into the shell 100 is sleeved with a third shaft sleeve 230, the third shaft sleeve 230 is embedded in the inner ring of a third bearing 232, and is rotatably arranged in a mounting groove 102 of the shell 100 through the third bearing 232. The first shaft sleeve 210, the second shaft sleeve 220 and the third shaft sleeve 230 can protect the rotating shaft 200 and maintain its stability. In the embodiment, the rotating shaft 200 passes through the first chamber 110 and the second chamber 120 at the same time, so that the change of the angular displacement can be transmitted to two different parts of the grating module 400 in the first chamber 110 and the second chamber 120 at the same time.

[0042] The grating module 400 is connected with the rotating shaft 200, and can convert the physical change of the angular displacement of the rotating shaft 200 into the change of the pattern coding position on the grating disc. In the embodiment, the grating module 400 mainly includes a first grating disc 410 and a second grating disc 420, and the first grating disc 410 and the second grating disc 420 are sleeved on the rotating shaft 200. The first grating disc 410 is arranged between the first shaft sleeve 210 and the second shaft sleeve 220 and located in the first chamber 110, and the second grating disc 420 is arranged between the second shaft sleeve 220 and the third shaft sleeve 230 and located in the second chamber 120. In addition, the first grating disc 410 and the second grating disc 420 are provided with different pattern codings in different radial directions to distinguish different change states of the angular displacement.

[0043] The light source module 300 is used to emit detection light, and the detection light passing through the grating disc of the grating module 400 can show the position change and generate a detection light signal. In the embodiment, the light source module 300 includes a first light source 310 and a second light source 320. The first light source 310 is arranged on the inner side of the end cover 140 and located in the first chamber 110, and irradiates the first grating disc 410 in the first chamber 110; the second light source 320 is arranged on the inner side of the end of the mounting groove 102 of the shell 100 and located in the second chamber 120, and irradiates the second grating disc 420 in the second chamber 120. The first light source 310 and the second light source 320 are composed of a plurality of infrared pulse LED light sources.

[0044] The photoelectric receiving module 500 is used for receiving the detection light signal generated by the detection light passing through the grating. The photoelectric receiving module 500 of the embodiment is arranged on the partition plate 130, and the photoelectric receiving module 500 includes a first receiving assembly 510 and a second receiving assembly 520, which are arranged on the two sides of the partition plate 130, respectively. The first receiving assembly 510 is provided with a first fixed grating 512 and a first linear array CMOS sensing element 514; and the second receiving assembly 520 is provided with a second fixed grating 522 and a second linear array CMOS sensing element 524. The first linear array CMOS sensing element 514 and the second linear array CMOS sensing element 524 are both provided with a plurality of elements and are uniformly distributed along the radial direction. When the rotating shaft 200 rotates, the first grating disc 410 and the second grating disc 420 rotate relative to the fixed grating, a phase difference is generated through the change of light intensity, and then two sets of angle light signals are synchronously obtained. The angle light signals are collected by the linear array CMOS sensing element, and are converted into electrical signals by the signal processing assembly, and are further transmitted to the information processing and control device outside the sensor.

[0045] A specific working mode of the embodiment is as follows:

[0046] Firstly, the new energy vehicle angle displacement sensor of the embodiment is installed at a position to be detected, and one end of the rotating shaft 200 extending out of the shell 100 is connected with the detection object. Then, the sensor starts to work. When the detection object has an angle displacement during the working process, the rotating shaft 200 rotates, and simultaneously drives the first grating disc 410 and the second grating disc 420 to rotate synchronously. The rotation of the first grating disc 410 and the second grating disc 420 causes the change of the detection light passing through the two discs, so that the first receiving assembly 510 and the second receiving assembly 520 synchronously receive the angle light signals, generate corresponding current signals, and then output the angle displacement electrical signals to the outside through the photoelectric receiving module 500, so as to complete the real-time and rapid detection of the angle displacement.

[0047] In the embodiment, the new energy vehicle angle displacement sensor divides the first chamber 110 and the second chamber 120 by arranging the partition plate 130 in the shell 100, and then arranges two sets of light source modules 300, grating modules 400 and photoelectric receiving modules 500 in the first chamber 110 and the second chamber 120, respectively. The rotation of the two sets of grating modules 400 is driven by a rotating shaft 200, so as to realize the multi-module composite detection, avoid the detection error caused by the influence of dust on the single detection module, enhance the anti-interference ability of the angle displacement sensor, and solve the problem that the optical angle displacement sensor in the prior art is easily affected by dust and impurities in the air in a complex and harsh environment, resulting in a large error of the measurement result.

[0048] Meanwhile, the first receiving assembly 510 and the second receiving assembly 520 of the photoelectric receiving module 500 are arranged on the partition plate 130 simultaneously, so that the two can be electrically connected with the same signal processing assembly and share the same signal processing assembly, thereby reducing the cost of electrical components.

[0049] Further, the new energy vehicle angular displacement sensor of the embodiment is further provided with a difference warning module (not shown in the figure) electrically connected with the photoelectric receiving module 500 outside the shell 100, the difference warning module can calculate the deviation value of the angular displacement electrical signals fed back by the first receiving assembly 510 and the second receiving assembly 520. When the deviation value exceeds the set threshold value, the difference warning module can send a warning signal to the external control device, showing that the internal part of the angular displacement sensor is interfered by dust and sundries at this time. The operator can open the end cover 140 in time, disassemble the partition plate 130 for cleaning, and exclude the error data in time after observing the warning signal.

[0050] Preferably, in the embodiment, the infrared pulse LED light source of the first light source 310 and the second light source 320 adopts an 850nm infrared light source, so as to reduce the environmental light interference and improve the signal-to-noise ratio through PWM pulse modulation. Meanwhile, a collimating lens is arranged outside the infrared pulse LED light source to ensure that the light is uniformly irradiated to the surface of the first grating disc 410 and the second grating disc 420.

[0051] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model and are not used to limit the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A new energy vehicle angular displacement sensor, characterized in that, The utility model relates to a kind of optical angle sensor, including: Shell (100), inside being provided with partition (130), the partition (130) is divided into first chamber (110) and second chamber (120) in the shell (100) inside;First light source (310) and first receiving component (510) are arranged in the first chamber (110);Second light source (320) and second receiving component (520) are arranged in the second chamber (120); Rotating shaft (200), rotating and being arranged in the shell (100); Grating module (400), including first grating disc (410) and second grating disc (420);The first grating disc (410) is arranged in the first chamber (110);Second grating disc (420) is arranged in the second chamber (120); Wherein, the first grating disc (410) and second grating disc (420) are connected with the rotating shaft (200);When the rotating shaft (200) rotates, the first grating disc (410) and second grating disc (420) can be synchronously driven to rotate, to emit angular displacement signal to the first receiving component (510) and second receiving component (520).

2. The new energy vehicle angular displacement sensor according to claim 1, wherein, One side of the shell (100) is provided with a first mounting hole (142), and the other side of the shell (100) is provided with an installation groove (102) inside. The partition (130) is provided with a second mounting hole (132). The rotating shaft (200) passes through the first mounting hole (142) and the second mounting hole (132) in sequence, and the end of the rotating shaft (200) extending into the shell (100) is arranged in the installation groove (102).

3. The new energy vehicle angular displacement sensor according to claim 2, characterized in that, The rotating shaft (200) is provided with a first bearing (212), a second bearing (222) and a third bearing (232) between the first mounting hole (142), the second mounting hole (132) and the installation groove (102) respectively.

4. The new energy vehicle angular displacement sensor according to claim 3, characterized in that, The rotating shaft (200) is provided with a first shaft sleeve (210), a second shaft sleeve (220) and a third shaft sleeve (230) between the inner ring of the first bearing (212), the second bearing (222) and the third bearing (232) respectively.

5. The new energy vehicle angular displacement sensor according to claim 2, wherein, The end cover (140) is detachably arranged on one side of the shell (100) where the first mounting hole (142) is arranged.

6. The new energy vehicle angular displacement sensor according to claim 1, wherein, Further comprising: Difference early warning module, arranged outside the shell (100); The difference early warning module is electrically connected with the first receiving component (510) and the second receiving component (520), and can emit a warning signal according to the difference value of the angular displacement signals fed back by the first receiving component (510) and the second receiving component (520).

7. The new energy vehicle angular displacement sensor according to claim 1, wherein, The first light source (310) and the second light source (320) are arranged inside the opposite two side walls of the shell (100) respectively. The first receiving component (510) and the second receiving component (520) are arranged on both sides of the partition (130). The first receiving component (510) and the second receiving component (520) are electrically connected with the signal processing component.

8. The new energy vehicle angular displacement sensor according to claim 1, wherein, The first receiving component (510) and the second receiving component (520) each comprise a fixed grating and a linear array CMOS sensing element.

9. The new energy vehicle angular displacement sensor according to any one of claims 1-8, characterized in that, The first light source (310) and the second light source (320) each comprise a plurality of infrared pulse LED light sources.

10. The new energy vehicle angular displacement sensor according to claim 9, characterized in that, The infrared pulse LED light source is externally provided with a collimating lens.

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