System for confirming position of rearview mirror and vehicle

Abstract

The invention discloses a system for confirming the position of a rearview mirror and a vehicle, an acquisition module is composed of two AD sampling ports arranged on an MCU module, and the two AD sampling ports are used for synchronously and respectively acquiring the power supply voltage and the position voltage of a rearview mirror adjusting motor, so that the MCU module can perform quotient operation on the power supply voltage and the position voltage; the two AD sampling ports are used for synchronous acquisition, so that voltage fluctuation interference during AD independent sampling can be effectively avoided, voltage fluctuation errors are reduced, the acquired power supply voltage and position voltage are more accurate, the position of the rearview mirror is accurately confirmed, meanwhile, the two AD sampling ports of the MCU module are occupied to realize judgment of the position signal, and the judgment accuracy is improved. And functions can be realized without adding extra modules, so that system wire harnesses and cost are greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to the position confirmation of automobile rearview mirrors. Background Art

[0002] Currently, the mirror angle of vehicle rearview mirrors is usually adjusted by a motor. During the motor adjustment process, the rearview mirror is usually flipped up and down and swung left and right with the X-axis and Y-axis of the rearview mirror as the rotation axes. The adjustment range is usually within 1 / 2 of the space above, below, left, and right of the rearview mirror. Due to the viewing angle problem of the rearview mirror, the X-axis and Y-axis are not at the center position of the rearview mirror, resulting in a small rotation angle of the rearview mirror mirror surface, and the driver cannot accurately confirm the adjustment position of the rearview mirror.

[0003] Chinese Patent with Publication No. CN 118876864 A discloses a control device for a vehicle rearview mirror, including: the controller of the vehicle can respond to a rearview mirror deployment request, obtain the memory information determined by the divided voltage of the position potentiometer and the supply voltage of the rearview mirror before the last folding from the memory, determine the target position of the rearview mirror according to the memory information, and control the rearview mirror to deploy to the target position.

[0004] However, separately collecting the divided voltage and the supply voltage will be interfered by voltage fluctuations and cannot accurately and reliably determine the accurate position of the rearview mirror.

[0005] Therefore, how to accurately confirm the adjustment position of the rearview mirror to accurately control the adjustment angle of the rearview mirror has become an urgent problem to be solved in this field. Summary of the Invention

[0006] Based on the defects of the prior art, the purpose of the present invention is to provide a system and a vehicle that can accurately confirm the position of the rearview mirror.

[0007] To achieve the above purpose, the system for confirming the position of the rearview mirror provided by the present invention is used in cooperation with the adjustment motor of the rearview mirror and includes an MCU module and a collection module

[0008] The collection module is composed of two AD sampling ports arranged on the MCU module. The two AD sampling ports are configured to synchronously and separately collect the power supply voltage and the position voltage of the adjustment motor,

[0009] The MCU module is configured to perform a quotient operation on the power supply voltage and the position voltage to determine the position signal of the rearview mirror.

[0010] Further, the adjustment motor includes a drive power supply and a position sensor. The power supply voltage is the voltage of the drive power supply, and the position voltage is the voltage of the position sensor.

[0011] Further, the power supply voltage is the standard voltage obtained by the acquisition module after dividing the driving power supply of the adjustment motor through a resistor.

[0012] Further, the position voltage is the voltage obtained by the acquisition module after dividing the power supply voltage through the resistance of the adjustment motor itself and the internal resistance of the adjustment motor.

[0013] Further, the position sensor is composed of a sliding rheostat.

[0014] Further, an internal voltage division acquisition circuit is provided between the driving power supply output port of the adjustment motor and the acquisition input port of the acquisition module, and the internal voltage division acquisition circuit is connected to the internal operation circuit of the adjustment motor.

[0015] Further, the acquisition input ports are respectively composed of the first AD sampling port and the second AD sampling port of the MCU module.

[0016] Further, the internal voltage division acquisition circuit includes a power supply voltage acquisition circuit, a position voltage acquisition circuit, and a motor control module circuit connected in parallel. The motor control module circuit is configured to control the operation state of the adjustment motor, and the power supply voltage acquisition circuit and the position voltage acquisition circuit are configured to move synchronously and respectively acquire the power supply voltage and the position voltage.

[0017] Further, voltage division resistors are respectively connected in series in the power supply voltage acquisition circuit and the position voltage acquisition circuit.

[0018] To achieve the above object, the vehicle provided by the present invention includes a rearview mirror and a control unit, and the system for confirming the position of the rearview mirror is provided in the vehicle.

[0019] For the system and vehicle for confirming the position of the rearview mirror provided by the present invention, the acquisition module is composed of two AD sampling ports provided on the MCU module, and synchronously and respectively acquires the power supply voltage and the position voltage of the rearview mirror adjustment motor through the two AD sampling ports, so that the MCU module can perform a quotient operation on the power supply voltage and the position voltage to determine the position signal of the rearview mirror. The synchronous acquisition of the two AD sampling ports can effectively avoid the voltage fluctuation interference during single AD sampling, making the acquired power supply voltage and position voltage more accurate. Judging the position of the rearview mirror through the ratio of the power supply voltage and the position voltage can effectively reduce the voltage fluctuation error, thereby accurately confirming the position of the rearview mirror. At the same time, the judgment of the position signal can be realized by occupying two AD sampling ports of the MCU module, without adding additional modules to realize the function, thereby greatly reducing the system wiring harness and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 System block diagram for confirming the position of the rearview mirror provided by the present invention;

[0022] Figure 2 An example of the system for confirming the position of the rearview mirror provided by the present invention

[0023] Figure 3 is Figure 2 Circuit diagram of the example;

[0024] Figure 4 Working flowchart of the system for confirming the position of the rearview mirror provided by the present invention.

[0025] Reference numerals:

[0026] 1. MCU module; 11. First AD sampling port; 12. Second AD sampling port; 2. Acquisition module; 3. Internal voltage division acquisition circuit; 31. Power supply voltage acquisition circuit; 32. Position voltage acquisition circuit; 33. Motor control module circuit; 4. Internal operation circuit. Detailed implementation manners

[0027] In order to make the technical means, creative features, achieved purposes and functions implemented by the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0028] Refer to Figure 1 , which shows an example of the system for confirming the position of the rearview mirror provided by the present invention.

[0029] As can be seen from the figure, the system for confirming the position of the rearview mirror in this example is used in cooperation with the adjustment motor of the rearview mirror, and mainly includes an MCU module 1 and an acquisition module 2.

[0030] The acquisition module 2 is composed of two AD sampling ports provided on the MCU module 1. The two AD sampling ports are configured to synchronously and separately acquire the power supply voltage and the position voltage of the adjustment motor, so as to reduce the voltage fluctuation of separate acquisition, and thus acquire more accurate power supply voltage and position voltage. The acquisition module 2 can realize the judgment of the position signal by occupying two AD sampling ports of the MCU module 1, and does not need to add an additional module to realize the function, thereby greatly reducing the system wiring harness and cost.

[0031] Furthermore, the MCU module 1 is configured to perform a quotient operation on the power supply voltage and the position voltage to determine the position signal of the rearview mirror, and obtain the position of the rearview mirror through the ratio of the power supply voltage and the position voltage, which can effectively reduce the interference of voltage fluctuation, and thus accurately confirm the position of the rearview mirror.

[0032] Among them, a driving power supply and a position sensor are provided in the internal operation circuit of the rearview mirror adjustment motor. Preferably, the position sensor is composed of a sliding rheostat. When the position state of the sliding rheostat changes, the resistance value and voltage of the sliding rheostat also change, and it can adjust the output current magnitude of the driving power supply in the internal operation circuit of the adjustment motor, thereby controlling the operation state of the adjustment motor. Therefore, when the adjustment motor moves, the position state, resistance value, and voltage of the sliding rheostat will also change accordingly, while the resistance value and voltage of the driving power supply remain unchanged.

[0033] Thus, the acquisition module 2 acquires the resistance in the adjustment motor to obtain the power supply voltage and position voltage of the adjustment motor, and transmits the power supply voltage and position voltage back to the MCU module 1 in real time to provide position confirmation data for the MCU module 1.

[0034] Further, the power supply voltage is the driving power supply voltage of the adjustment motor, and the position voltage is the position sensor of the adjustment motor, that is, the voltage of the sliding rheostat. The position voltage will change with the movement of the adjustment motor. According to Ohm's law, the MCU module 1 performs a quotient operation on the power supply voltage and position voltage acquired by the acquisition module 2, and can obtain the distribution ratio of the position voltage in the internal operation circuit of the adjustment motor, which can reflect the position state of the sliding rheostat, thereby obtaining the movement state of the adjustment motor to obtain the position signal of the rearview mirror.

[0035] Specifically, when the acquisition module 2 transmits the power supply voltage and position voltage back to the MCU module 1, the MCU module 1 will clamp the voltage to protect the internal circuit of the MCU module 1. In order to enable the MCU module 1 to obtain the accurate power supply voltage and position voltage, the power supply voltage is defined as the standard voltage after the driving power supply of the adjustment motor is divided by a resistor by the acquisition module 2. Correspondingly, the position voltage is defined as the voltage after the power supply voltage is divided by the resistance of the adjustment motor itself and the resistance in the internal operation circuit of the adjustment motor by the acquisition module 2, so that the acquisition module 2 can divide the power supply voltage and position voltage and then transmit them back to the MCU module 1, avoiding the clamping of the power supply voltage and position voltage by the clamping circuit inside the MUC module 1, reducing energy loss, and ensuring the accurate values of the power supply voltage and position voltage.

[0036] At the same time, the acquisition module 2 is composed of two AD sampling ports on the MCU module 1, and no additional module is required to implement the function, thus greatly reducing the system wiring harness and cost. Moreover, by synchronously acquiring the power supply voltage and position voltage through the two AD sampling ports respectively, the two AD sampling ports can sample the two voltage signals at the same moment, which can more accurately reflect the states of the power supply voltage and position voltage at the same moment, thereby improving the acquisition accuracy and reducing the voltage interference fluctuation caused by separate acquisition.

[0037] Further, the power supply voltage and the position voltage are essentially collected after resistor voltage division. However, during the process of adjusting the motor startup, there will be slight voltage interference fluctuations inside the adjusting motor. Therefore, by calculating the ratio of the power supply voltage and the position voltage through a quotient operation to determine the position of the rearview mirror, the voltage interference fluctuations can be effectively eliminated and the judgment accuracy can be improved.

[0038] To illustrate the specific implementation process of this solution, the following is an example of the acquisition and judgment scheme of this system.

[0039] Combined with Figures 2 to 4 , specifically, an internal voltage division acquisition circuit 3 is set between the drive power output port of the adjusting motor and the acquisition input port of the acquisition module 2. The acquisition input port is composed of the first AD sampling port 11 and the first AD sampling port 12 of the MCU module 1. Moreover, the internal voltage division acquisition circuit 3 is connected to the internal operation circuit 4 of the adjusting motor, and the first AD sampling port 11 and the first AD sampling port 12 are used to respectively collect the power supply voltage and the position voltage in the internal operation circuit 4 of the adjusting motor through the internal voltage division acquisition circuit 3.

[0040] Further, the internal voltage division acquisition circuit 3 includes a power supply voltage acquisition circuit 31, a position voltage acquisition circuit 32 and a motor control module circuit 33 connected in parallel, so that the motor control module circuit 33 controls the operation state of the adjusting motor, and the power supply voltage acquisition circuit 31 and the position voltage acquisition circuit 32 can operate synchronously to respectively collect the power supply voltage and the position voltage, reducing the voltage fluctuation interference.

[0041] Among them, a second capacitor C2 and a third capacitor C3 are connected in parallel in the motor control module circuit 33, and the second capacitor C2 and the third capacitor C3 are respectively connected to both ends of the adjusting motor M to control the operation state of the adjusting motor M.

[0042] In the power supply voltage acquisition circuit 31, the first end of the drive power output port of the adjusting motor is connected in series with a first voltage dividing resistor R1 and a second voltage dividing resistor R2. The second end of the drive power output port is connected to the first end of a first capacitor C1. The second end of the first capacitor C1 is connected to the first end of a sliding rheostat R39 in the internal operation circuit 4. The third end of the first capacitor C1 is connected to the second capacitor C2 of the motor control module circuit 33. The output branch between the first voltage dividing resistor R1 and the second voltage dividing resistor R2 is connected to the first AD sampling port 11 of the MCU module, so that the voltage of the drive power output port of the adjusting motor can be divided by the first voltage dividing resistor R1 and the second voltage dividing resistor R2 and then output to the first AD sampling port 11 to collect the power supply voltage and transmit it back to the MCU module 1 in real time.

[0043] Further, the second terminal of the sliding rheostat R39 is connected to the fifth capacitor C5 in the position voltage acquisition circuit 32, and the sliding contact of the sliding rheostat R39 is connected to the fourth capacitor C4 in the voltage acquisition circuit 32. The fourth capacitor C4 is connected in series with the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4. The output branch between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 is connected to the second AD sampling port of the MCU module, so that the voltage of the sliding rheostat R39 can be divided by the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 and then output to the second AD sampling port 12 to collect the position voltage and transmit it back to the MCU module 1 in real time.

[0044] The internally voltage-dividing acquisition circuit 3 thus formed can synchronously and separately collect the power supply voltage and the position voltage after resistor voltage division through the two AD sampling ports of the MCU module 1 to obtain accurate power supply voltage and position voltage and transmit them to the MCU module 1 in real time.

[0045] Further, the MCU module 1 performs a quotient operation on the power supply voltage and the position voltage to obtain the distribution ratio of the power supply voltage and the position voltage in the internal operation circuit 4 of the adjusting motor, and reduces voltage fluctuation interference, so as to accurately reflect the position state of the sliding rheostat R39, obtain the motion state of the adjusting motor, and obtain the position signal of the rearview mirror, so as to accurately control the adjusting position of the rearview mirror.

[0046] Thus, the system for confirming the position of the rearview mirror provided by the present invention is constituted.

[0047] Further, the present invention also provides a vehicle, including a rearview mirror and a control unit. The vehicle is provided with the system for confirming the position of the rearview mirror constituted by the above solution to accurately control the adjusting position of the rearview mirror.

[0048] The system and vehicle for confirming the position of the rearview mirror provided by the present invention, the acquisition module is constituted by two AD sampling ports arranged on the MCU module, and synchronously and separately collect the power supply voltage and the position voltage of the rearview mirror adjusting motor through the two AD sampling ports, so that the MCU module can perform a quotient operation on the power supply voltage and the position voltage to determine the position signal of the rearview mirror, can effectively reduce the voltage fluctuation error, make the collected power supply voltage and position voltage more accurate, and thus accurately confirm the position of the rearview mirror. At the same time, the judgment of the position signal can be realized by occupying the two AD sampling ports of the MCU module, and no additional module is required to implement the function, thus greatly reducing the system wiring harness and cost.

[0049] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for confirming the position of a rearview mirror, which is used in cooperation with the adjustment motor of the rearview mirror, characterized in that It includes an MCU module and a collection module. The collection module is composed of two AD sampling ports arranged on the MCU module. The two AD sampling ports are configured to synchronously and respectively collect the power supply voltage and the position voltage of the adjustment motor. The MCU module is configured to perform a quotient operation on the power supply voltage and the position voltage to determine the position signal of the rearview mirror.

2. The system for confirming the position of the rearview mirror according to claim 1, wherein The adjustment motor includes a drive power supply and a position sensor. The power supply voltage is the voltage of the drive power supply, and the position voltage is the voltage of the position sensor.

3. The system for confirming the position of the rearview mirror according to claim 2, wherein, The power supply voltage is the standard voltage after the drive power supply of the adjustment motor is voltage-divided by a resistor by the collection module.

4. The system for confirming the position of the rearview mirror according to claim 2, wherein The position voltage is the voltage after the power supply voltage is voltage-divided by the resistance of the adjustment motor itself and the internal resistance of the adjustment motor by the collection module.

5. The system for confirming the position of the rearview mirror according to claim 4, wherein, The position sensor is composed of a sliding rheostat.

6. The system for confirming the position of the rearview mirror according to claim 2, characterized in that, An internal voltage-dividing collection circuit is provided between the drive power supply output port of the adjustment motor and the collection input port of the collection module. The internal voltage-dividing collection circuit is connected to the internal operation circuit of the adjustment motor.

7. The system for confirming the position of the rearview mirror according to claim 6, wherein The collection input port is respectively composed of the first AD sampling port and the second AD sampling port of the MCU module.

8. The system for confirming the position of the rearview mirror according to claim 6, wherein The internal voltage-dividing collection circuit includes a parallel power supply voltage collection circuit, a position voltage collection circuit, and a motor control module circuit. The motor control module circuit is configured to control the operation state of the adjustment motor. The power supply voltage collection circuit and the position voltage collection circuit are configured to move synchronously and respectively collect the power supply voltage and the position voltage.

9. The system for confirming the position of the rearview mirror according to claim 8, characterized in that, Voltage-dividing resistors are respectively connected in series in the power supply voltage collection circuit and the position voltage collection circuit.

10. A vehicle, comprising a rearview mirror and a control unit, characterized in that, The vehicle is provided with the system for confirming the position of the rearview mirror according to any one of claims 1 to 9.

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