Dimming motor device for automobile headlamp and automobile

Abstract

The utility model discloses a dimming motor device for an automobile headlamp and an automobile. The dimming motor device comprises a dimming motor (1), a microcontroller unit (2) and an H bridge (3), a motor connecting end of the H bridge is connected with a power input end of the dimming motor, a control signal interface of the H bridge is connected with a digital signal interface of the microcontroller unit, an analog signal input end of the microcontroller unit receives a feedback signal of the dimming motor, and a communication signal interface of the microcontroller unit is in communication connection with an automobile central control screen system. The control signal is sent by the central control screen system and is used for controlling the light height of the headlamp. The communication signal interface of the microcontroller unit in the dimming motor device is in communication connection with the central control screen system, and the central control screen system transmits the on-off action control signal of the software switch to the microcontroller unit, so that the light height of the headlamp can be controlled through the central control screen system.

Description

Technical Field

[0001] The utility model relates to an electric control component for a car headlight, in particular to a dimming motor device for a car headlight and a car. Background Art

[0002] At present, the dimming motors used in car lights on the market usually use brushed DC motors or two-phase stepper motors. The DC motor is usually used in conjunction with the headlight height adjustment switch. The driver adjusts the light height by turning the switch. It is a manual adjustment device. The stepper motor is driven by a stepper motor driver chip and cooperates with the height sensor installed on the vehicle chassis to achieve automatic adjustment of the light height.

[0003] The current problem is:

[0004] 1) The control signal for the DC dimming motor is an analog voltage signal, which cannot accept PWM, LIN, CAN and other signals. As a result, the dimming motor cannot be controlled through the car's central control screen system.

[0005] 2) The DC dimming motor does not support the sleep wake-up function, has a maximum static current of 12mA, and has a large loss.

[0006] In addition, some other background technologies (or concepts) involved in the present utility model are further described as follows:

[0007] H-Bridge is an electronic circuit structure, also known as a bridge circuit or motor drive circuit. It is usually composed of four power switches (such as bipolar power transistors, field effect transistors or insulated gate bipolar transistors), which are connected into an "H" shape. The main function of the H-bridge is to control the direction of the current so that the current can flow in both directions, thereby realizing the forward and reverse (including speed) control of the motor.

[0008] In the H-bridge rectifier, the four power switches can be controlled to open or close by the drive circuit. By changing the combination of the switch states of these four switches, the direction and magnitude of the current can be controlled, thereby achieving precise control of the motor. For example, in the pulse width modulation (PWM) drive waveform, the H-bridge rectifier can be used to efficiently control DC motors, bipolar stepper motors, etc. Summary of the invention

[0009] The utility model aims to provide a dimming motor device for automobile headlights, which can receive a control signal from a central control screen system to control the action of the dimming motor.

[0010] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0011] A dimming motor device for automobile headlights, the automobile having a central control screen system, the dimming motor device comprising a dimming motor; the dimming motor device also comprising a microcontroller unit and an H-bridge; the motor connection end of the H-bridge is connected to the power input end of the dimming motor, the control signal interface of the H-bridge is connected to the digital signal interface of the microcontroller unit, the analog signal input end of the microcontroller unit receives a feedback signal from the dimming motor, and the communication signal interface of the microcontroller unit is communicatively connected to the automobile central control screen system to receive a control signal from the central control screen system for controlling the light height of the headlights.

[0012] Furthermore, the communication signal interface of the microcontroller unit is connected to the CAN bus inside the car through a CAN signal converter, and the communication signal interface of the microcontroller unit is communicatively connected to the car's central control screen system through the CAN bus.

[0013] Furthermore, the communication signal interface of the microcontroller unit is connected to the LIN bus inside the car through a LIN signal converter, and the communication signal interface of the microcontroller unit is communicatively connected to the car's central control screen system through the LIN bus.

[0014] Furthermore, the dimming motor device also includes a potentiometer, the ball head rod of the dimming motor is fixedly connected to a potentiometer slider of the potentiometer, and the analog signal input end of the microcontroller unit is connected to a sliding potential end of the potentiometer.

[0015] Furthermore, the dimming motor device also includes a filter, and the filter is arranged at the access point of the external power supply.

[0016] Furthermore, the dimming motor device further includes an LDO regulator, and the microcontroller unit is connected to a power supply via the LDO regulator.

[0017] A car adopts the dimming motor device as described above.

[0018] Compared with the prior art, the dimming motor device of the utility model has the following beneficial effects:

[0019] 1) The communication signal interface of the microcontroller unit in the dimming motor device is connected to the central control screen system. The central control screen system transmits the switch action control signal of the software switch to the microcontroller unit, so that the dimming motor action can be controlled by the central control screen system to control the height of the headlights, thereby improving the control effect of the car;

[0020] 2) In the dimming motor device of the present invention, a sleep wake-up program is provided in the microcontroller unit for the dimming motor, and the sleep wake-up program can control the dimming motor to enter a sleep state, thereby achieving lower sleep power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The electrical schematic diagram of a dimming motor device according to one embodiment of the utility model is shown in FIG. Figure 1 In the process, the communication signal interface of the microcontroller unit receives the transmission signal of the automobile CAN bus;

[0022] Figure 2 The electrical schematic diagram of a dimming motor device according to another embodiment of the present invention is shown in FIG. Figure 2 In the process, the communication signal interface of the microcontroller unit receives the transmission signal of the vehicle LIN bus. DETAILED DESCRIPTION

[0023] The utility model is further described below with specific embodiments:

[0024] This embodiment provides a dimming motor device for a car headlight, which can receive a control signal from a central control screen system to control the operation of a dimming motor 1.

[0025] See also Figure 1 The dimming motor device of this embodiment includes a dimming motor 1 and a complete set of digital control circuit modules set for the dimming motor 1.

[0026] It should be noted that the dimming motor 1 is a DC motor, which is a device in the prior art, and is used to provide driving force for the dimming device, and drives the ball head rod of the dimming device to extend and retract forward and backward through a multi-stage transmission mechanism. The ball head rod cooperates with the low beam / high beam module of the car headlight to drive the module to rotate, thereby realizing the adjustment of the light irradiation angle.

[0027] The dimming motor 1 has a power input end (including two connecting ends, a positive pole and a negative pole) and a ball head rod.

[0028] The H-bridge 3 is a device of the prior art, and is used to drive the dimming motor 1 to rotate. In addition, the H-bridge 3 can also control the forward and reverse rotation and the speed of the dimming motor 1 according to a control signal.

[0029] Specifically,

[0030] The H-bridge 3 has a power supply connection terminal (including two connection terminals), a motor connection terminal (including two connection terminals, a positive electrode and a negative electrode), and a control signal interface.

[0031] The power connection end is used to connect to a power source to receive power input;

[0032] The motor connection end is used to connect the motor to provide electric power to drive the motor to rotate;

[0033] The control signal interface is used to receive a control signal to control the forward and reverse rotation and speed of the dimming motor 1 .

[0034] The microcontroller unit 2 is a device of the prior art, and has a power input terminal, a ground terminal, an analog signal input terminal, a digital signal interface, and a communication signal interface.

[0035] The LDO regulator 5 is a device of the prior art, which has a power input terminal and a power output terminal. The LDO regulator 5 is used to receive power input from the power input terminal and then convert it into power with a stable voltage to output power from the power output terminal.

[0036] The filter 4 is a device in the prior art, which is used to filter out unnecessary frequency components in the power supply to improve the power supply quality.

[0037] The communication signal converter 6 is a device of the prior art, which is used to convert the communication signal. In this embodiment, the signal communicated with the microcontroller unit 2 is a CAN signal, so the communication signal converter 6 adopts a CAN signal converter. In other embodiments, the corresponding communication signal converter 6 is adopted according to the selection of the signal communicated with the microcontroller unit 2. For example, for the LIN signal, a LIN signal converter is adopted.

[0038] The potentiometer 7 is a device of the prior art, which has two fixed potential terminals and a potential slider, on which a sliding potential terminal is arranged.

[0039] In this embodiment, the connection between the various devices is set as follows:

[0040] The power connection end of the H-bridge 3 is connected to a pre-configured external power supply, the motor connection end of the H-bridge 3 is connected to the power input end of the dimming motor 1, the control signal interface of the H-bridge 3 is connected to the digital signal interface of the microcontroller unit 2, the power input end of the microcontroller unit 2 is connected to the power supply through the LDO regulator 5, and the ground end of the microcontroller unit 2 is grounded.

[0041] The ball head rod of the dimming motor 1 is fixedly connected to the potential slider of the potentiometer 7, and the analog signal input end of the microcontroller unit 2 is connected to the sliding potential end of the potentiometer 7. In this way, the dimming position of the dimming device can be known by understanding the potential signal output by the sliding potential end of the potentiometer 7. The two fixed potential ends of the potentiometer 7 are grounded and connected to the power supply respectively.

[0042] The communication signal interface of the microcontroller unit 2 is connected to the communication signal converter 6. The microcontroller unit 2 receives external communication signals through the communication signal converter 6, mainly receiving the control signal of "controlling the height of the headlights" sent by the automobile central control screen system. In this embodiment, the communication signal interface of the microcontroller unit 2 receives the transmission signal of the automobile CAN bus.

[0043] The filter 4 is arranged at the line where the external power supply is connected. The microcontroller unit 2 and the communication signal converter 6 are both powered by the external power supply after passing through the filter 4 and the LDO regulator 5 , and the H bridge 3 and the potentiometer 7 are powered by the external power supply after passing through the filter 4 .

[0044] In this embodiment, a software switch for controlling the height of the headlights is provided in the central control screen system of the car. The central control screen system converts the "switch action of the software switch" into a control signal and transmits the control signal to the CAN signal converter ( Figure 1 The CAN signal converter converts the CAN signal into an SPI signal and transmits it to the microcontroller unit 2 in the dimming motor device. The microcontroller unit 2 controls the dimming motor 1 to rotate through the H bridge 3 according to the received control signal. The ball head rod of the dimming motor 1 drives the potential slider of the potentiometer 7 to slide. The microcontroller unit 2 receives the potential signal output by the sliding potential end of the potentiometer 7, and analyzes and judges the potential signal to determine whether the dimming motor 1 is rotated to the right position, and controls the rotation of the dimming motor 1 according to the control signal and the potential signal.

[0045] In this way, the effect of "controlling the action of dimming motor 1 through the central control screen system to control the light height of the headlights" is achieved.

[0046] See also Figure 2 In another embodiment, the LIN bus can also be used instead of the CAN bus, that is, the central control screen system transmits the "switch action of the software switch" control signal to the microcontroller unit 2 through the LIN bus inside the car, which can also achieve the effect of "controlling the action of the dimming motor 1 through the central control screen system to control the light height of the headlights".

[0047] It should be noted that the microcontroller unit 2 is provided with a program for controlling the specific operation of the dimming motor 1, and the program in the microcontroller unit 2 is not an innovation of this case. As long as the specific function of the dimming motor 1 is determined, any computer software company can compile a control program for the corresponding function implementation. Therefore, the program set in the microcontroller unit 2 should be regarded as prior art.

[0048] The dimming motor device of this embodiment has the following advantages:

[0049] 1) A microcontroller unit 2 is provided in the dimming motor device of this embodiment, and the dimming motor 1 is controlled by the microcontroller unit 2, and the communication signal interface of the microcontroller unit 2 is connected to the central control screen system for communication. The central control screen system transmits the "switch action of the software switch" control signal to the microcontroller unit 2, thereby achieving the effect of "controlling the action of the dimming motor 1 through the central control screen system to control the height of the headlights", thereby improving the control effect of the car;

[0050] 2) In the dimming motor device of the present embodiment, a sleep wake-up program is provided in the microcontroller unit 2 for the dimming motor. The sleep wake-up program can control the dimming motor 1 to enter a sleep state. Through software settings, the dimming motor 1 can enter a sleep state when there is no signal on the CAN bus / LIN bus, thereby achieving lower sleep power consumption.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dimming motor device for a car headlight, the car having a central control screen system, the dimming motor device comprising a dimming motor (1); Features: The dimming motor device also includes a microcontroller unit (2) and an H-bridge (3); The motor connection end of the H bridge (3) is connected to the power input end of the dimming motor (1). The control signal interface of the H bridge (3) is connected to the digital signal interface of the microcontroller unit (2). The analog signal input terminal of the microcontroller unit (2) receives the feedback signal of the dimming motor (1). The communication signal interface of the microcontroller unit (2) is connected to the automobile central control screen system for communication so as to receive a control signal for controlling the light height of the headlights sent by the central control screen system.

2. The dimming motor device for automobile headlights according to claim 1, characterized in that: The communication signal interface of the microcontroller unit (2) is connected to the CAN bus inside the car via a CAN signal converter, and the communication signal interface of the microcontroller unit (2) is communicatively connected to the central control screen system of the car via the CAN bus.

3. The dimming motor device for automobile headlights according to claim 1, characterized in that: The communication signal interface of the microcontroller unit (2) is connected to the LIN bus inside the car via a LIN signal converter, and the communication signal interface of the microcontroller unit (2) is communicatively connected to the central control screen system of the car via the LIN bus.

4. The dimming motor device for automobile headlights according to claim 1, characterized in that: The dimming motor device also includes a potentiometer (7), the ball head rod of the dimming motor (1) is fixedly connected to the potential slider of the potentiometer (7), and the analog signal input end of the microcontroller unit (2) is connected to the sliding potential end of the potentiometer (7).

5. The dimming motor device for automobile headlights according to claim 1, characterized in that: The dimming motor device further comprises a filter (4), and the filter (4) is arranged at the access point of the external power supply.

6. The dimming motor device for automobile headlights according to claim 1, characterized in that: The dimming motor device further comprises an LDO voltage regulator (5), and the microcontroller unit (2) is connected to a power supply via the LDO voltage regulator (5).

7. A car, characterized in that: The automobile adopts the dimming motor device according to any one of claims 1 to 6.

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