A light adjusting motor device for an automobile headlamp

Abstract

The utility model relates to a kind of automobile headlamp dimmer motor device, including dimmer motor end, car body end and user end, the motor is equipped in the dimmer motor end, the user end is input dimming demand and sends dimming demand to car body end, micro control unit and drive unit are equipped in the car body end, the micro control unit controls drive unit drive motor forward rotation or reverse rotation by comparing dimming demand with existing dimmer motor voltage.The utility model has the advantages that when there is no new dimming instruction, the motor does not act, there is no misoperation due to voltage change, and the whole device has good anti-interference performance and low cost, and high flexibility when used.

Description

Technical Field

[0001] This utility model relates to the field of automotive headlight electronic control, and in particular to an automotive headlight dimming motor device. Background Technology

[0002] Currently, the traditional control method for automotive headlight dimming motors is a mechanical DIP switch, which outputs a voltage signal through resistor voltage division. However, this method is gradually being replaced by large-screen control. Since current integrated circuits for dimming motors can only recognize voltage signals, existing technologies either convert the pulse-width modulation (PWM) signal from the central control unit to a DC voltage signal for the dimming motor via a conversion circuit at the vehicle side, or directly output the PWM signal at the vehicle side, with the dimming motor internally converting the PWM signal to a DC signal.

[0003] However, the above method has the following drawbacks: the conversion circuit needs to increase the circuit cost regardless of whether it is at the vehicle body end or the dimming motor end; the whole solution is still limited by the dedicated chip for motor drive, that is, it can only recognize voltage signals. The chip is expensive and mostly consists of imported components. Furthermore, the dedicated chip is limited by the signal voltage and power supply voltage. Voltage fluctuations at any end will cause the chip to misidentify. It has poor anti-interference ability and cannot achieve full voltage range coverage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a car headlight dimming motor device with good anti-interference performance in view of the above-mentioned existing technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a car headlight dimming motor device, including a dimming motor end, a body end and a user end. The dimming motor end is equipped with a motor. The user end inputs dimming requirements and transmits the dimming requirements to the body end. The body end is equipped with a microcontroller unit and a drive unit. The microcontroller unit controls the drive unit to drive the motor to rotate forward or backward by comparing the dimming requirements with the existing dimming motor voltage.

[0006] In order for the microcontroller to receive the existing dimming motor voltage information, the dimming motor terminal is further provided with a potentiometer that can provide real-time feedback on the position of the motor ball head. The microcontroller receives the voltage feedback signal from the potentiometer and compares the received voltage feedback signal with the dimming requirements input by the user.

[0007] In order for the potentiometer to reflect the voltage condition of the motor rotation, the potentiometer is further slidably connected to the motor.

[0008] In order to enable the drive unit to be controlled by the microcontroller unit and drive the motor to rotate in both directions, the drive unit is further defined as an H-bridge, with the input end of the H-bridge connected to the microcontroller unit and the output end connected to the motor.

[0009] The drive unit can have another structure. Preferably, the drive unit includes an IC chip that can calculate the number of motor rotations by identifying motor current ripple. The IC chip and the microcontroller unit transmit information through the IIC communication protocol.

[0010] Compared with the prior art, the advantages of this utility model are as follows: the microcontroller unit in the automotive headlight dimming motor device controls the drive unit to drive the motor to rotate forward or backward by comparing the dimming demand with the existing dimming motor voltage. When there is no new dimming command, the motor does not move, and there will be no situation of false operation due to voltage changes. It has good anti-interference performance, and the entire device has low cost and high flexibility in use. Attached Figure Description

[0011] Figure 1 This is a system framework diagram of Embodiment 1 of this utility model;

[0012] Figure 2 This is a system framework diagram of Embodiment 2 of this utility model. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0014] Example 1

[0015] Figure 1 shows one of the preferred embodiments of this utility model. This embodiment of an automotive headlight dimming motor device includes a dimming motor end 1, a vehicle body end 2, and a user end 3.

[0016] The dimming motor end 1 contains a motor 11 and a potentiometer 12 that can provide real-time feedback on the position of the motor ball head. The potentiometer 12 is slidably connected to the motor 11. The body end 2 contains a microcontroller 21 and an H-bridge 22. The input end of the H-bridge 22 is connected to the microcontroller 21, and the output end is connected to the motor 11.

[0017] In this embodiment, the user terminal 3 inputs a dimming requirement and transmits the dimming requirement to the vehicle body terminal 2. The microcontroller unit 21 receives the voltage feedback signal from the potentiometer 12 and compares the received voltage feedback signal with the dimming requirement input by the user terminal 3. The microcontroller unit 21 controls the H-bridge 22 to drive the motor 11 to rotate forward or backward by comparing the two.

[0018] The dimming motor device has three voltage levels at its motor terminal 1, with voltage values ​​of 1V (level 1), 2V (level 2), and 3V (level 3). The specific operating process of this embodiment is as follows:

[0019] Step 1: Assume that the dimming motor terminal 1 is currently in position 1, and potentiometer 12 feeds back 1V voltage to the vehicle body terminal 2;

[0020] Step 2: The user terminal 3 inputs the dimming requirement of level 2. The vehicle terminal 2 compares the required voltage of 2V with the current voltage of 1V fed back by potentiometer 12. The microcontroller unit 21 controls the H-bridge 22 to drive the motor 11 to rotate forward. The motor 11 drives the potentiometer 12 to slide, and the voltage of the potentiometer 12 increases. When it reaches 2V, the microcontroller unit 21 closes the H-bridge, and the motor 11 stops rotating. This action ends.

[0021] Step 3: User terminal 3 inputs the dimming requirement for level 1 again. Vehicle terminal 2 compares the required voltage (1V) with the current voltage (2V) of potentiometer 12. Microcontroller 21 controls H-bridge 22 to drive motor 11 in reverse. Motor 11 drives potentiometer 12 to slide, and the voltage of potentiometer 12 decreases. When it reaches 1V, microcontroller 21 closes H-bridge, and motor 11 stops rotating. This action ends.

[0022] In this embodiment, the dimming motor terminal 1 consists only of a motor 11 and a potentiometer 12, while the vehicle body terminal 2 only requires one voltage sampling line and an H-bridge 22, greatly reducing costs. When there is no new dimming command, the motor 11 does not operate, preventing malfunctions due to voltage changes. The dimming motor terminal 1's dimming level and travel distance are set by the vehicle body terminal software, allowing for flexible and customizable settings to match different headlight designs without additional hardware investment.

[0023] Example 2

[0024] like Figure 2 As shown, the difference between this embodiment and embodiment one is that: the body end 2 is equipped with a microcontroller unit 21 and an IC chip 23, while the dimming motor end 1 only has a motor 11. The IC chip 23 can calculate the number of rotations of the motor 11 by identifying the current ripple of the motor 11. The IC chip 23 and the microcontroller unit 21 transmit information through the IIC communication protocol.

[0025] The specific working process of this embodiment is as follows:

[0026] Step 1: The vehicle body drives the motor 11 to rotate in the reverse direction until it stops at the stall position, which is recorded as gear 1. Based on the last set position (e.g., gear 2) at the vehicle body end 2, drive the motor 11 to rotate forward 300 times (calculated by the dedicated IC chip to calculate the motor running current ripple according to the transmission ratio definition) and then stop the motor. The operation is complete (this calibration operation is performed after the first power-on and after a cumulative run of N times).

[0027] Step 2: The user terminal 3 inputs the dimming requirement of level 3, the vehicle terminal 2 compares with the previous setting of level 2, and then the micro control unit 21 drives the motor 11 to rotate forward 300 times and stop through the control IC chip 23, and the action ends.

[0028] Step 3: User terminal 3 inputs the dimming requirement of level 2 again. Vehicle terminal 2 compares with the previous setting of level 3. Then, micro control unit 21 drives motor 11 to reverse 300 times and stop through control IC chip 23, and the action ends.

[0029] In this embodiment, the dimming motor end 1 consists only of the motor 11, while the vehicle body end 2 only requires one IC chip 23 with ripple acquisition, and the wiring harness is significantly reduced, greatly reducing costs. When there is no new dimming command, the motor 11 does not operate, and there is no possibility of malfunction due to voltage changes. The dimming motor end 1's dimming level and movement distance are set by the vehicle body end software, which can be freely set, offering high flexibility and allowing it to match different headlight designs without additional hardware investment.

Claims

1. A kind of automobile headlight dimmer motor device, including dimmer motor end (1), car body end (2) and user end (3), motor (11) is equipped in the dimmer motor end (1), the user end (3) input dimming demand and send dimming demand to car body end (2), it is characterized by: The vehicle body end (2) is provided with a micro control unit (21) and a drive unit. The micro control unit (21) controls the drive unit to drive the motor (11) to rotate forward or backward by comparing the dimming requirements with the existing dimming motor voltage.

2. The automotive headlight dimming motor device according to claim 1, characterized in that: The dimming motor end (1) is equipped with a potentiometer (12) that can provide real-time feedback on the position of the motor ball head. The microcontroller unit (21) receives the voltage feedback signal from the potentiometer (12) and compares the received voltage feedback signal with the dimming requirements input by the user terminal (3).

3. The automotive headlight dimming motor device according to claim 2, characterized in that: The potentiometer (12) is slidably connected to the motor (11).

4. The automotive headlight dimming motor device according to claim 2, characterized in that: The drive unit is an H-bridge (22), the input end of which is connected to the microcontroller unit (21), and the output end is connected to the motor (11).

5. The automotive headlight dimming motor device according to claim 1, characterized in that: The drive unit (22) includes an IC chip (23) that can calculate the number of rotations of the motor (11) by identifying the current ripple of the motor (11). The IC chip (23) and the microcontroller unit (21) transmit information through the IIC communication protocol.

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