Control circuit for preventing car window / skylight from being drawn in during opening and closing

Abstract

The utility model provides a control circuit for preventing an automobile window / skylight from being drawn in during opening and closing, and belongs to the technical field of automobiles. The motor control circuit is electrically connected with the input interface and the output interface of the control chip, the motor control circuit is electrically connected with the driving motor, the control chip can control the driving motor to stop and rotate forwards and backwards, in addition, the current sampling circuit is electrically connected between the motor control circuit and the AD interface of the control chip, and the current sampling circuit is electrically connected with the current sampling circuit. Therefore, the running current of the driving motor can flow into the current sampling circuit, the running current is converted into a voltage signal through the current sampling circuit, and the voltage signal is input to the AD interface of the control chip, so that the control chip can monitor the magnitude of the running current of the driving motor in real time. Whether an involving problem occurs is directly judged according to the change of the running current of the driving motor, so that the interference of external environmental factors on a judgment result is avoided, the judgment accuracy is improved, and the normal use of the car window / skylight is ensured.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, specifically to a control circuit for preventing entanglement during the opening and closing of car windows / sunroofs. Background Technology

[0002] With the development of automotive electrification, car windows / sunroofs are typically driven by motors to open and close. However, when drivers and passengers use the car and open / close the windows / sunroof, there is a risk of accidentally getting fingers or other body parts or foreign objects stuck in the gaps of the glass. If this is not detected and reacted to in time when the glass is raised or lowered, it can easily cause accidental injury. Therefore, improving the accuracy of the anti-entrapment detection during the opening and closing of car windows / sunroofs is extremely important.

[0003] Currently, existing methods for preventing car windows / sunroofs from being pulled in during opening and closing include determining whether an obstacle is being pinched based on the number of pulses. For example, patent CN103758431A discloses an anti-pinch control method and system for electric car windows. This method connects the controller to a microcontroller minimum system via serial communication, connects the motor drive module to the stepper motor, and further connects the microcontroller minimum system to the motor drive module, infrared LEDs, and infrared detection modules. In use, a Hall element corresponds to a magnetic ring on the stepper motor shaft. During the window raising and lowering process, the stepper motor moves, and the movement of the stepper motor is converted into the number of Hall signal pulses through the cooperation of the Hall element and the magnetic ring. The position of the window is determined by the number and duration of the Hall signal pulses. When the window is in the anti-pinch zone, infrared light is emitted by the infrared LEDs, and the intensity of the infrared light is detected by the infrared detection module. The microcontroller minimum system compares the intensity of the emitted infrared light with the intensity of the detected infrared light. When the intensity difference is greater than a threshold, a signal is sent to the controller, which then controls the window to stop or reverse its movement. Although the above methods can achieve anti-entrapment detection, they rely solely on the number of Hall signal pulses and changes in infrared light intensity to determine the presence of factors such as motor drive slippage, dust, or obstructions. This makes them highly susceptible to interference from external environmental factors, leading to misjudgments during the judgment process, affecting the accuracy of the judgment, and consequently impacting the normal use of the car window / sunroof. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this paper aims to provide a control circuit for preventing foreign objects from being drawn into the windows / sunroof during opening and closing. This circuit electrically connects both the motor control circuit and the current sampling circuit to a control chip, and the drive motor is electrically connected to the motor control circuit. The current sampling circuit samples the operating current of the drive motor, converts it into a voltage signal, and sends it back to the control chip. The control chip monitors the magnitude of the operating current in the drive motor, ensuring that the drive motor stops or reverses in case of abnormal current conditions. This directly prevents foreign objects from being drawn into the windows / sunroof at the source, improving accuracy and ensuring the normal use of the windows / sunroof.

[0005] The specific technical solution is as follows:

[0006] A control circuit for preventing car windows / sunroofs from being pulled in during opening and closing, used to control the stop and forward / reverse rotation of a drive motor, is characterized by comprising: a control chip, a motor control circuit, and a current sampling circuit. The motor control circuit is electrically connected to the input and output interfaces of the control chip and to the drive motor. Simultaneously, the current sampling circuit is electrically connected to the motor control circuit and is also electrically connected to the AD interface of the control chip.

[0007] The aforementioned control circuit for preventing entanglement during the opening and closing of a car window / sunroof includes a motor control circuit comprising a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a packaged diode, a Zener diode, an automotive relay, a bidirectional TVS diode array, a first capacitor, a second capacitor, and a third capacitor. The base (B) pin of the first transistor is connected in series with the first resistor and then electrically connected to the first input / output interface of the control chip. The emitter (E) pin of the first transistor is grounded, and the collector (C) pin is electrically connected to pin 4 of the automotive relay. The positive terminal of the power supply is connected to the first diode and then electrically connected to pins 2 and 3 of the automotive relay. The base (B) pin of the second transistor is connected in series with the second resistor and then electrically connected to the second input / output interface of the control chip. The emitter (E) pin of the second transistor... The first transistor is grounded, and its C pin is electrically connected to pin 1 of a packaged diode. The pin 2 of the packaged diode is electrically connected to pin C of the first transistor. Pin 3 of the packaged diode is connected in series with a Zener diode and then grounded. The C pin of the second transistor is also electrically connected to pin 1 of the automotive relay. The B pins of the first and second transistors are also grounded after being connected in series with a third resistor and a fourth resistor, respectively. Meanwhile, pin 5 of the automotive relay is electrically connected to the current sampling circuit. Pin 8 of the automotive relay is electrically connected to the positive terminal of the power supply. Pins 6 and 7 of the automotive relay are electrically connected to the two poles of the drive motor, respectively. In addition, a bidirectional TVS diode array and a first capacitor are connected in parallel between the two poles of the drive motor. Furthermore, the two poles of the drive motor are grounded after being connected in series with a second capacitor and a third capacitor, respectively.

[0008] In the aforementioned control circuit for preventing entanglement during the opening and closing of car windows / sunroofs, a test point is connected to the C pin of the first transistor.

[0009] The aforementioned control circuit for preventing entanglement during the opening and closing of car windows / sunroofs includes a current sampling circuit comprising an operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor. Pin 3 of the operational amplifier is connected in series with the fifth resistor and then electrically connected to pin 5 of the automotive relay. Pin 5 of the automotive relay is connected to ground via a parallel circuit of the sixth resistor and the fourth capacitor. Pin 3 of the operational amplifier is also connected in series with the seventh resistor and then grounded. Simultaneously, pin 5 of the operational amplifier is electrically connected to the positive terminal of the power supply and connected in series with the fifth capacitor and then grounded. Pin 1 of the operational amplifier is connected in series with the eighth resistor and then electrically connected to the AD interface of the control chip. The AD interface of the control chip is also connected in series with the sixth capacitor and then grounded. Pin 2 of the operational amplifier is grounded. Pin 4 of the operational amplifier is connected in series with a parallel circuit of the ninth resistor and the seventh capacitor and then electrically connected to pin 1 of the operational amplifier. Pin 4 of the operational amplifier is also connected in series with the tenth resistor and then grounded.

[0010] The aforementioned control circuit for preventing car windows / sunroofs from being pulled in during opening and closing uses a control chip model R5F10AGGCLFB.

[0011] In the aforementioned control circuit for preventing entanglement during the opening and closing of car windows / sunroofs, both the first and second transistors are NPN type transistors.

[0012] In the aforementioned control circuit for preventing entanglement during the opening and closing of car windows / sunroofs, both the first and second transistors are model BC817-40Q.

[0013] The aforementioned control circuit for preventing entanglement during the opening and closing of car windows / sunroofs uses an automotive relay with the model number HFKJ-T / 12-BZSPT.

[0014] The aforementioned control circuit for preventing entanglement during the opening and closing of car windows / sunroofs uses a BAV70Q packaged diode.

[0015] The positive effects of the above technical solution are:

[0016] The aforementioned control circuit for preventing foreign objects from being pulled in during the opening and closing of car windows / sunroofs electrically connects the motor control circuit to the input and output interfaces of the control chip, and also electrically connects the drive motor to the motor control circuit. This enables control over the stop and forward / reverse rotation of the drive motor. Furthermore, a current sampling circuit is installed between the motor control circuit and the AD interface of the control chip. This circuit samples the operating current of the drive motor, converts it into a voltage signal, and sends it back to the control chip. This allows the control chip to monitor the magnitude of the operating current in the drive motor in real time. When the operating current suddenly increases, it can determine that an object is being pulled in, directly preventing foreign objects from being pulled in at the source. This improves the accuracy of the judgment and ensures the normal use of the car windows / sunroofs. Attached Figure Description

[0017] Figure 1 A simplified structural diagram of an embodiment of the control circuit for preventing entanglement during the opening and closing of a car window / sunroof according to this utility model;

[0018] Figure 2 A circuit diagram of a motor control circuit according to a preferred embodiment of the present invention;

[0019] Figure 3 This is a circuit diagram of a current sampling circuit according to a preferred embodiment of the present invention.

[0020] In the attached diagram: 1. Control chip; 2. Motor control circuit; 21a. First transistor; 21b. Second transistor; 22a. First resistor; 22b. Second resistor; 22c. Third resistor; 22d. Fourth resistor; 23. First diode; 24. Packaged diode; 25. Zener diode; 26. Automotive relay; 27. Bidirectional TVS diode array; 28a. First capacitor; 28b. Second capacitor; 28c. Third capacitor; 29. ​​Test point; 3. Current sampling circuit; 31. Operational amplifier; 32a. Fifth resistor; 32b. Sixth resistor; 32c. Seventh resistor; 32d. Eighth resistor; 32e. Ninth resistor; 32f. Tenth resistor; 33a. Fourth capacitor; 33b. Fifth capacitor; 33c. Sixth capacitor; 33d. Seventh capacitor; 4. Drive motor. Detailed Implementation

[0021] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 3 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0022] Figure 1 This is a simplified structural diagram of an embodiment of the control circuit for preventing entanglement during the opening and closing of a car window / sunroof, according to this utility model. Figure 1As shown, the anti-winding control circuit provided in this embodiment is used to control the stop and forward / reverse rotation of the drive motor to meet the anti-winding requirements. At this time, the anti-winding control circuit includes: a control chip 1, a motor control circuit 2, and a current sampling circuit 3, and the control chip 1, motor control circuit 2, and current sampling circuit 3 are arranged on the same circuit board.

[0023] Specifically, the input and output interfaces of control chip 1 include a first input and output interface and a second input and output interface, which are used to control the stop and forward / reverse rotation of drive motor 4, respectively. At this time, the motor control circuit 2 is electrically connected to the input and output interfaces of control chip 1, such as... Figure 1 Channels ① and ⑥ are used. Furthermore, the motor control circuit 2 is electrically connected to the drive motor 4, as shown below. Figure 1 Channels ② and ③ allow control chip 1 to input control signals to motor control circuit 2 via input and output interfaces. Motor control circuit 2 then controls the drive motor 4 to stop and rotate in both directions, meeting the anti-entanglement requirements. Simultaneously, current sampling circuit 3 is electrically connected to motor control circuit 2, and also electrically connected to the AD interface of control chip 1. Figure 1 In channels ④ and ⑤, during operation, the operating current of the drive motor 4 flows into the current sampling circuit 3. The sampling resistor in the current sampling circuit 3 converts the operating current into a voltage signal, which is then transmitted back to the control chip 1 via the AD interface. This satisfies the control chip 1's requirement for real-time monitoring of the driving motor 4's operating current. Because if a foreign object is caught in the drive motor 4 during the opening and closing of the window / sunroof, the operating current of the drive motor 4 will change due to the change in the drive motor 4's operating resistance, causing the driving motor 4's operating current to increase instantaneously. Therefore, the control chip 1 can obtain real-time information on whether an object has been caught, directly judging the prevention of catching from the source—the drive motor 4. This avoids interference from external environmental factors, improves the accuracy of the judgment, and ensures the normal use of the window / sunroof.

[0024] Figure 2 This is a circuit diagram of a motor control circuit according to a preferred embodiment of the present invention. Figure 1 and Figure 2As shown, the motor control circuit 2 includes a first transistor 21a, a second transistor 21b, a first resistor 22a, a second resistor 22b, a third resistor 22c, a fourth resistor 22d, a first diode 23, a packaged diode 24, a Zener diode 25, an automotive relay 26, a bidirectional TVS diode array 27, a first capacitor 28a, a second capacitor 28b, and a third capacitor 28c. First, the B pin of the first transistor 21a is connected in series with the first resistor 22a and then electrically connected to the first input / output interface of the control chip 1. Preferably, the control chip 1 is a control chip of model R5F10AGGCLFB. Furthermore, the E pin of the first transistor 21a is grounded, and the C pin of the first transistor 21a is electrically connected to pin 4 of the automotive relay 26. The automotive relay 26 is preferably of model HFKJ-T / 12-BZSPT, and the first transistor 21a is preferably an NPN transistor, with the preferred model being BC817-40Q. In addition, the positive terminal of the power supply is electrically connected to the first diode 23, and then electrically connected to pins 2 and 3 of the automotive relay 26. The B pin of the second transistor 21b is connected in series with the second resistor 22b and then electrically connected to the second input and output interface of the control chip 1. The E pin of the second transistor 21b is grounded, and the C pin is electrically connected to pin 1 of a packaged diode 24. The pin 2 of the packaged diode 24 is electrically connected to the C pin of the first transistor 21a. The pin 3 of the packaged diode 24 is connected in series with a Zener diode 25 and then grounded. Preferably, the packaged diode 24 is a BAV70Q. Furthermore, the C pin of the second transistor 21b is also electrically connected to pin 1 of the automotive relay 26. The B pins of the first transistor 21a and the second transistor 21b are also connected in series with the third resistor 22c and the fourth resistor 22d, respectively, and then grounded. Preferably, the second transistor 21b is also an NPN transistor, and its model is BC817-40Q. Meanwhile, pin 5 of the automotive relay 26 is electrically connected to the current sampling circuit 3, pin 8 of the automotive relay 26 is electrically connected to the positive terminal of the power supply, and pins 6 and 7 of the automotive relay 26 are electrically connected to the two poles of the drive motor 4, respectively. At the same time, a bidirectional TVS diode array 27 and a first capacitor 28a are connected in parallel between the two poles of the drive motor 4. Furthermore, the two poles of the drive motor 4 are connected in series with a second capacitor 28b and a third capacitor 28c, respectively, and then grounded. At this time, the control signals of the first input and output interface and the second input and output interface of the control chip 1 can be converted to control the drive motor 4 to stop and reverse, thereby controlling the normal operation of the drive motor 4 and stopping or reversing it in the event of entanglement, thus improving the safety of use.

[0025] More specifically, a test point 29 is electrically connected to the C pin of the first transistor 21a in the motor control circuit 2, which facilitates testing and verification by the testing personnel to ensure that the circuit can operate normally.

[0026] Figure 3 This is a circuit diagram of a current sampling circuit according to a preferred embodiment of the present invention. Figure 1 , Figure 2 as well as Figure 3 As shown, the current sampling circuit 3 includes an operational amplifier 31, a fifth resistor 32a, a sixth resistor 32b, a seventh resistor 32c, an eighth resistor 32d, a ninth resistor 32e, a tenth resistor 32f, a fourth capacitor 33a, a fifth capacitor 33b, a sixth capacitor 33c, and a seventh capacitor 33d. Pin 3 of the operational amplifier 31 is connected in series with the fifth resistor 32a and then electrically connected to pin 5 of the automotive relay 26. The sixth resistor 32b and the fourth capacitor 33a form a parallel circuit. Pin 5 of the automotive relay is connected to ground after being grounded by the parallel circuit of the sixth resistor 32b and the fourth capacitor 33a. Pin 3 of the operational amplifier 31 is also connected in series with the seventh resistor 32c and then grounded. Simultaneously, pin 5 of the operational amplifier 31 is electrically connected to the positive terminal of the power supply. Pin 5 of the operational amplifier 31 is also connected in series with the fifth capacitor 33b and then grounded. Pin 1 of the operational amplifier 31 is connected in series with the eighth resistor 32d and then electrically connected to the AD interface of the control chip 1. The AD interface of the control chip 1 is also connected in series with the sixth capacitor 33c and then grounded. Additionally, pins of the operational amplifier 31... Pin 2 is grounded. The ninth resistor 32e and the seventh capacitor 33d form a parallel circuit. Furthermore, pin 4 of the operational amplifier 31 is connected in series with the parallel circuit of the ninth resistor 32e and the seventh capacitor 33d, and then electrically connected to pin 1 of the operational amplifier 31. Additionally, pin 4 of the operational amplifier 31 is connected in series with the tenth resistor 32f and then grounded. This allows the operating current of the drive motor 4 in the motor control circuit 2 to flow into the current sampling circuit 3. The operating current is converted into a voltage signal through the sampling resistor. After the voltage signal is amplified and filtered by the operational amplifier 31, it is input to the AD interface of the control chip 1. This ensures that the control chip 1 can monitor the magnitude of the operating current of the drive motor 4 in real time, providing data support for accurate judgment of anti-entanglement.

[0027] The control circuit for preventing entanglement during the opening and closing of car windows / sunroofs provided in this embodiment includes a control chip 1, a motor control circuit 2, and a current sampling circuit 3. By electrically connecting the input and output interfaces of the motor control circuit 2 and the control chip 1, and simultaneously electrically connecting the motor control circuit 2 to the drive motor 4, the control chip 1 can control the stop and forward / reverse rotation of the drive motor 4. In addition, the current sampling circuit 3 is electrically connected between the motor control circuit 2 and the AD interface of the control chip 1, so that the operating current of the drive motor 4 can flow into the current sampling circuit 3. The current sampling circuit 3 converts the operating current into a voltage signal and inputs it to the AD interface of the control chip 1. This enables the control chip 1 to monitor the magnitude of the operating current of the drive motor 4 in real time, and directly judge whether an entanglement problem has occurred based on the change in the operating current of the drive motor 4. This avoids interference from external environmental factors on the judgment result, improves the accuracy of the judgment, and ensures the normal use of the car window / sunroof.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A control circuit for preventing entanglement during the opening and closing of vehicle windows / sunroofs, used to control the stop and forward / reverse rotation of the drive motor, characterized in that, include: The system includes a control chip, a motor control circuit, and a current sampling circuit. The motor control circuit is electrically connected to the input and output interfaces of the control chip and to the drive motor. The current sampling circuit is also electrically connected to the motor control circuit and to the control circuit D interface of the control chip for preventing entanglement during window / sunroof opening and closing.

2. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 1, characterized in that, The motor control circuit includes a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a packaged diode, a Zener diode, an automotive relay, a bidirectional TVS diode array, a first capacitor, a second capacitor, and a third capacitor. The base (B) pin of the first transistor is connected in series with the first resistor and then electrically connected to the first input / output interface of the control chip. The emitter (E) pin of the first transistor is grounded, and the collector (C) pin is electrically connected to pin 4 of the automotive relay. The positive terminal of the power supply is connected to the first diode and then electrically connected to pins 2 and 3 of the automotive relay. The base (B) pin of the second transistor is connected in series with the second resistor and then electrically connected to the second input / output interface of the control chip. The emitter (E) pin of the second transistor is grounded, and the collector (C) pin is electrically connected to pin 1 of one of the packaged diodes. Furthermore, pin 2 of the packaged diode is electrically connected to pin C of the first transistor, pin 3 of the packaged diode is connected in series with a Zener diode and then grounded, and pin C of the second transistor is also electrically connected to pin 1 of the automotive relay. Pins B of the first transistor and the second transistor are also connected in series with the third resistor and the fourth resistor, respectively, and then grounded. Meanwhile, pin 5 of the automotive relay is electrically connected to the current sampling circuit, pin 8 of the automotive relay is electrically connected to the positive terminal of the power supply, and pins 6 and 7 of the automotive relay are respectively electrically connected to the two poles of the drive motor. In addition, the bidirectional TVS diode array and the first capacitor are connected in parallel between the two poles of the drive motor, and the two poles of the drive motor are respectively connected in series with the second capacitor and the third capacitor and then grounded.

3. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 2, characterized in that, A test point is connected to the C pin of the first transistor.

4. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 2 or 3, characterized in that, The current sampling circuit includes an operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor. Pin 3 of the operational amplifier is connected in series with the fifth resistor and then electrically connected to pin 5 of the automotive relay. Pin 5 of the automotive relay is connected to ground via a parallel circuit of the sixth resistor and the fourth capacitor. Pin 3 of the operational amplifier is also connected in series with the seventh resistor and then grounded. Simultaneously, pin 5 of the operational amplifier is electrically connected to the positive terminal of the power supply and connected in series with the fifth capacitor before being grounded. Pin 1 of the operational amplifier is connected in series with the eighth resistor and then electrically connected to the control circuit D interface of the control chip for preventing entanglement during window / sunroof opening and closing. The control circuit D interface of the control chip for preventing entanglement during window / sunroof opening and closing is also connected in series with the sixth capacitor and then grounded. Pin 2 of the operational amplifier is grounded. Pin 4 of the operational amplifier is connected in series with the parallel circuit of the ninth resistor and the seventh capacitor and then electrically connected to pin 1 of the operational amplifier. Pin 4 of the operational amplifier is also connected in series with the tenth resistor and then grounded.

5. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 1, characterized in that, The control chip is model R5F10, which is a control circuit for preventing entanglement when opening and closing car windows / sunroofs, called GGCLFB.

6. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 4, characterized in that, Both the first transistor and the second transistor are NPN type transistors.

7. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 6, characterized in that, Both the first transistor and the second transistor are model BC817-40Q.

8. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 2, characterized in that, The model number of the automotive relay is HFKJ-T / 12-BZSPT.

9. The control circuit for preventing entanglement during opening and closing of vehicle windows / sunroofs according to claim 2, characterized in that, The packaged diode is model B, which is a control circuit V70Q for preventing entanglement when opening and closing car windows / sunroofs.

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