TWI264390B - Vehicle rear view system - Google Patents

Abstract

A vehicle rear view system includes a mirror and a Hall sensing module having a Hall sensor and a magnetic body. The Hall sensing module is coupled with the mirror through the Hall sensor or the magnetic body. The magnetic providing a magnetic field for the Hall sensor to output an original voltage signal, and when the mirror is moved, the Hall sensor outputs a deflection voltage signal which is different from the original voltage signal due to a magnetic flux change.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a vehicle rearview mirror system, and more particularly to sensing a position change of a rearview mirror using a Hall sensor. Vehicle rearview mirror system. [Prior Art]

Vehicle rearview mirrors are used to allow the driver to view the conditions on either side or behind the vehicle to ensure safe driving. The conventional car is equipped with rear view mirrors that are manual and electric. The manual rearview mirror must be in direct contact with the mirror body for adjustment, while the electric rearview mirror's driver only needs to press the adjustment button in the car to achieve the adjustment. When the mirror is changed by the external force and the position is changed, it must be re-adjusted, causing inconvenience in use. Therefore, the P-tool knows that the rear-view mirror uses a resistive sensor, and the application of the variable resistance principle is used. The brush moves on the carbon film to detect a change in the resistance value and thereby measure the amount of displacement. The driving of the brush is performed by a mechanism, and is divided into an angular motion form and a linear motion form. Conventional resistive sensors are configured to embed resistors in the mirrors and record the in-line resistance values at an angle to the mirror. When the mirror surface is affected by external force, the resistance value of the resistor changes. At this time, according to the change of the resistance value, the direction and rotation amount of the correction rotation required for the vertical two axes of the mirror surface are calculated to achieve the purpose of automatic positioning. However, due to temperature or moisture factors, the carbon film will shrink or expand. In addition, the brush also has a problem of friction, which may cause wear and contact failure after a period of use, and the resistance value may also change. Because the resistance value will increase with the increase of the environment 5 1264390 and its own temperature, and the frequency characteristics of the resistor are exemplified by the carbon resistance resistor or the DC resistance, the resistance values below 2 〇KHZ are the same. However, due to the influence of the capacitance distribution on the resistor, the resistance value usually decreases with the increase of the frequency. Therefore, in the harsh environment, the mirror can not be accurately positioned by the resistive positioning. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle rearview mirror system that allows the self-aligning function of the rearview mirror to operate in a harsh vehicle environment. Another object of the present invention is to provide a vehicle rear view mirror system that reduces the influence of positioning accuracy due to environmental changes. In accordance with the above objects of the present invention, a vehicle-assisted rear view i system is proposed. The vehicle rearview mirror system includes a mirror surface and a Hall sensing module. The Hall sensing module includes a Hall sensor and a magnetic body, a Hall sensor or a magnetic body coupled to the mirror. The Hall sensor is located in a magnetic field generated by the magnetic body and outputs an initial voltage signal; when the mirror sensor or the magnetic body is mirror-displaced, a Hall sensor is generated. The magnetic flux changes, and the sensor will sense this change in magnetic flux. According to the invention, the vehicle (four) mirror system comprises a mirror surface, two groups of Hall sensing modules and a control module. The control module includes two drivers and a & circuit. The two sets of Hall sensing modules are disposed on the axis of rotation of the mirror, respectively, which are responsible for the rotational sensing of two different axes of rotation, and the two axes of rotation are perpendicular to each other. In accordance with another preferred embodiment of the present invention, the source of the magnetic field of the Hall sensor is designed to be provided by a - magnetized link. By magnetizing the connecting rod, in the system 1264390

And a Hall sensing module 120a. The Hall sensing module 120a includes a Hall sensor 122a and a magnetic body 124a. The magnetic body 124a provides a magnetic field to the Hall sensor 122a, and the Hall sensor 122a correspondingly outputs an initial voltage signal. The Hall sensing module 120a is coupled to the mirror 11 by a Hall sensor 122a or a magnetic body 124a. When the components of the Hall sensing module 12〇a and the mirror surface u〇 are displaced with the mirror surface 110, the magnetic flux passing through the Hall sensor 122a thus generates a magnetic flux change, and the Hall sensor 1222a senses the magnetic flux change, and The output is different from the bias voltage signal of one of the initial voltage signals, thereby judging the displacement state of the mirror 11 〇. Referring also to FIG. 1B, a schematic diagram of a control module in a preferred embodiment of a vehicle rear view mirror in accordance with the present invention is shown. In a preferred embodiment, the vehicle rearview mirror system includes a mirror 110, a frame 1〇2, two sets of Hall sensing modules 120a and 120b, and a control module 13〇. The mirror 11 is disposed at the opening of the frame 102, and the control module 13 is electrically connected to the Hall sensors 122a, 122b to receive signals from the Hall sensors 122a, 12, and simultaneously coupled to the mirror 110. To adjust the position of the mirror 11〇. In this example, the control module 130 includes two driving devices 15A, 15B and a control circuit 140. The driving device is used to adjust the position of the mirror 110 and is electrically connected to the control circuit 14 , for example, a servo motor. Alternatively, the gearing mechanism can be more connected, the design of which depends on different requirements, and the two-axis horse f can also be used to drive both axial directions. The first Hall sensing module 12 includes a first Hall sensor 122a and a first magnetic body 12, and the second Hall sensing module 120b includes a second Hall sensor 122. Please control the rotation of the drive unit ^—^ and include a § ** </ RTI> </ RTI> </ RTI> for recording a location data. 1264390 The component of each Hall sensing module coupled to the mirror 110, that is, the Hall sensor or the magnetic body, is disposed on the two rotation axes 114, 116 of the mirror surface 110. The two rotation axes are perpendicular to each other. . In this embodiment, the Hall sensor is disposed on the mirror 11 ’, for example, on the outer edge of the mirror. In order for the Hall sensing unit to be responsible for sensing a direction of rotation, the Hall sensor is further disposed at a position passing through the axis of rotation of the mirror 110 to set the first Hall sensor 122a through the first axis of rotation 114, and second The Hall sensor 122b is disposed through the second axis of rotation 116 to make the circuit design simple and convenient.

The magnetic body is disposed adjacent to the frame 102 of one of the Hall sensors. In consideration of design convenience and inductive sensitivity, preferably, the rotation axes, that is, the first magnetic body 124a are disposed on the first rotation axis 114, and the second magnetic body 124b is disposed on the second rotation axis. 116 on. The operation of this system is described below. First, the driver adjusts the suitable mirror position, which is called the standard position. Since the Hall sensor receives a standard magnetic flux from the magnetic body, a standard voltage signal is generated, and the standard voltage signal is output to the control through a line. The module is converted into the corresponding standard position data, and the standard position data is recorded by using the memory. When the position of the mirror is changed by external force, the driver wants to return the mirror position. When the system is started next time, it only needs to adjust to the setting of the standard position data stored in the memory. At this time, because the position of the mirror surface changes, the Hall sensor disposed on the mirror surface also has a positional change at the same time. The relative position of the Hall sensor and the magnetic body must also change, and the Hall sensor senses The magnetic flux will also be different from the standard magnetic flux, and the output voltage signal is also different from the standard voltage signal, which is called the bias voltage signal. For example, if the mirror 110 is rotated by a 1264390 angle along the first axis of rotation m, the direction of rotation is as indicated by the arrow 112. At this time, the third sensor 122a in the first Hall sensing module 12A is There is no relative displacement between the first magnetic bodies 124a. Therefore, the voltage signal output by the first Hall sensor 122a is the same as the voltage signal of the private standard. However, the rotation causes the second Hall sensor 122b to be relatively displaced from the second magnetic body 124b, so the magnetic flux is different from the standard magnetic flux, and the voltage signal output by the second Hall sensor 122b is different from the standard voltage signal. .

The control circuit 140 receives the bias voltage signal, converts it into the corresponding displacement position data, and compares it with the standard position data, so that the required angle compensation amount can be outputted, and a control signal is transmitted to the driving device 150a' The driving device 15〇a is caused to change the position of the mirror 11〇 to achieve precise automatic positioning. Referring to Figure 2, there is shown a schematic view of another preferred embodiment of a vehicle rear view mirror system in accordance with the present invention. In another preferred embodiment of the present invention, the vehicle rearview mirror system includes a base 202 and a magnetizing link 224, and the magnetizing link 224 protrudes from the connecting rod shaft hole 220 of the base 202. . The link for adjusting the mirror angle in the rear view mirror of the vehicle is magnetized to become a permanent magnet, like the magnetic body in the above embodiment. The Hall sensor 222 is disposed on the pedestal adjacent to the magnetizing link 224 and is located on a first axis of rotation 214. The magnetized magnetizing link 224 provides a magnetic field to the Hall sensor 222. When the mirror 210 is displaced by an external force and is offset by an angular position, the magnetizing link 224 connected to the mirror 210 moves, so The magnetic flux induced by the sensor 222 also makes a difference, and the output voltage signal is different. The design of such a magnetizing link not only saves the cost of the additional 1264390, but also saves the time cost of setting the magnetic body, which will greatly increase the production capacity. It should be noted that, in order to simplify the description, only one Hall sensor 222 and the magnetizing link 224 are illustrated, which are responsible for the rotation of the mirror 21〇-rotation axis 214 direction, familiar with the art. After referring to the above description, it will be understood that the combination of means for performing a second rotation axis 216 in the direction of rotation is also the same as the foregoing.

Referring to Figure 3, there is shown a schematic view of another preferred embodiment of a vehicle rear view mirror system in accordance with the present invention. In another preferred embodiment, one of the ball joints 324 supporting the mirror support 302 is magnetized. The magnetized ball joint 324 is used to provide a mirror support 302-rotating fulcrum to rotate the mirror surface while providing a magnetic field. In the Hall sensor 322, the Hall sensor 322 is disposed near the magnetizing ball joint 324. In this example, two Hall sensors 322 are respectively disposed on the mirror bearing 302, close to the charging device. The ball joint 324 is at the bearing 304 and is located on the two axes of rotation 314 and 316. When the position of the mirror changes, that is, the magnetic ball joint 324 rotates, the magnetic flux sensed by the Hall sensor 322 also changes, thereby achieving the purpose of detecting the movement of the mirror position. It will be apparent from the above-described preferred embodiments of the present invention that the application of the present invention has the following advantages. The vehicle rearview mirror of the present invention provides a good performance for the conventional rearview mirror using the resistive sensing device by the Hall sensing module including the magnetic body and the Hall sensor which are not susceptible to temperature. The solution not only effectively improves the range of the vehicle conditions applicable to the rearview mirror, but also achieves good positioning accuracy. The invention can act as a magnetic body in the Hall sensing module by magnetizing the internal components of the rear view mirror of the vehicle, which is more advantageous for the speed of production and the cost. The present invention has been disclosed in the preferred embodiments, such as J1, and is not intended to limit the invention, and various modifications and refinements may be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. [Simple description of the map]

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; A schematic diagram of an example. Figure 1B is a schematic illustration of a control module in a preferred embodiment of a vehicle rearview mirror system in accordance with the present invention. Figure 2 is a schematic illustration of another preferred embodiment of a vehicle rearview mirror system in accordance with the present invention. Figure 3 is a schematic illustration of another preferred embodiment of a vehicle rearview mirror system in accordance with the present invention. [Main component symbol description] 102: Frame 112: Arrow 116: Second rotation axis 120b: Second Hall sensing module 122b: Second Hall sensor 124b · Second magnetic body 110: Mirror 114: A rotation axis 120a: first Hall sensing module 122a: first Hall sensor 124a · first magnetic body 130: control module 12 1264390

140: control circuit 150a, 150b: drive device 202: base 214: first axis of rotation 222: Hall sensor 226: link shaft hole 302: mirror bearing body 314, 316: axis of rotation 324: ball joint 142: Memory 210 · Mirror 216 : Second axis of rotation 224 : Magnetizing link 304 : Bearing 322 : Hall sensor

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Claims (1)

1264390 X. Patent application scope: 1 · A vehicle rearview mirror system comprising at least a mirror surface; and at least one Hall sensing module comprising at least: a Hall sensor; and a magnetic body providing a magnetic field The Hall sensor causes the Hall sensor to output an initial voltage signal, = /, the Hall sensing module is caused by the Hall sensor or the magnetic body [,: mirror surface combination] when the mirror surface is displaced, the Hall sensor senses a magnetic field, And outputting a bias voltage signal different from the initial voltage signal. The singular eyesight range is the middle π narration I early lion jun mirror system, the dry 隹 sensor is coupled to the ^, the mirror, the The magnetic system is located on a frame and is close to one of the Hall sensors. Brothers 3. As in the scope of the patent application, the magnetic system is lightly coupled to the vehicle rearview mirror system of the item, wherein the magnetic sensor is located adjacent to the magnetic body. . 4. The number of Hall sensing modules according to the scope of the patent application is one of the second axes of rotation of the mirror surface on one of the first axes of rotation of the mirror. The vehicle rear view mirror system of the present invention, wherein the first Hall sensing module is located in the stomach and the second Hall sensing module is located in the vehicle according to the fourth aspect of the patent application. a mirror system, wherein the first axis of rotation and the second axis of rotation are perpendicular to each other. 6. The vehicle rearview mirror system of claim 2, further comprising a control circuit, the control circuit respectively receiving and converting the standard voltage signal and the bias voltage signal to become a standard position data and a displacement position =Bei material 'According to the standard position data and the displacement position data, an angle compensation amount is calculated. 7. The vehicle rearview mirror system of claim 6, wherein the control circuit has a memory, the memory records the standard position data, and the vehicle is as described in claim 6 The mirror system further includes a driving device electrically connected to the control circuit and coupled to the mirror, and is controlled by the control circuit to adjust the mirror surface. 9. A vehicle rearview mirror system comprising at least one mirror surface; at least one magnetizing link having a permanent magnet coupled to the mirror surface for urging the mirror surface to change a position of the mirror surface; and a mull sensor 'located near the magnetizing link, wherein the magnetizing link provides a magnetic field to the Hall sensor, so that the Hall sensor outputs an initial voltage signal, when the magnetizing link is pushed and follows the 15 !264390 Mirror displacement 'The Hall senses II sense _ flux change and outputs a bias voltage signal different from one of the initial voltage signals. 10. The vehicle rearview mirror system of claim 9, wherein the number of magnetizing cups is two and is respectively connected to the position on the two axes of rotation of the mirror. A vehicle mirror system as claimed in claim 10, wherein the axes of rotation are perpendicular to each other. 12. The vehicle rearview mirror system of claim 9, further comprising a control circuit, wherein the control circuit receives and converts the standard voltage signal of the Hall sensor and the biased electric castle signal respectively. A standard position data and a displacement position data 'calculate an angle compensation amount according to the standard position data and the displacement position data. 13. The handle mirror system of claim 12, wherein the control circuit has a note, and the memory records the standard position data. 14. The vehicle rearview mirror system of claim 12 further comprising - (four) means & the (four) circuit electrically connected to the mirror surface, controlled by the control circuit to adjust the mirror surface. 15. The vehicle rearview mirror system of claim 9, wherein the Hall sensor is located on a base adjacent to the magnetizing link - position 16. A vehicle rear view mirror system, at least The utility model comprises a mirror surface; a 曰-magnetizing ball joint having a permanent magnet, (4) a mirror surface for providing the mirror surface and a pivot point; and a sensory sense of being located near the magnetizing ball joint. The magnetic ball joint provides a magnetic field to the Hall sensor, so that the Hall sensor outputs an initial voltage signal, and when the magnetic ball joint rotates along with the mirror surface, the Hall sensor senses one The magnetic flux changes and the output = the same as the bias voltage signal of one of the initial voltage signals. The vehicle rear view mirror system of claim 16, further comprising a control circuit, the control circuit respectively receiving and converting the standard voltage signal of the Hall sensor and the bias voltage signal to become a The standard position data and the displacement position data are calculated according to the standard position data and the displacement position data. The vehicle rear view mirror system of claim 17, wherein the control circuit has a memory that records the standard position data. 19. The vehicle rearview mirror system of claim 17 further comprising a drive device electrically coupled to the control circuit and coupled to the mirror surface </ RTI> controlled by the control circuit to adjust the mirror surface. The vehicle mirror system of claim 16, wherein the Hall sensor is located on a mirror support adjacent one of the magnetizing ball joints. 18