Wiper control system

Abstract

The application discloses a wiper control system and relates to the technical field of wiper control. The system comprises a wiper electronic controller and a wiper motor. A slow gear power output circuit and a fast gear power output circuit for driving the wiper motor to work are arranged between the wiper electronic controller and the wiper motor. The system further comprises a wiper return detection circuit and a brake control circuit. The wiper return detection circuit is used for detecting whether the wiper motor reaches a wiper return line zero position. The wiper electronic controller is used for controlling the brake control circuit to turn on the wiper motor coil and the wiper return line when it is detected that the wiper motor reaches the wiper return line zero position. In the application, the brake control circuit is directly connected to the wiper return line, and a large current generated by the brake does not flow through the internal ground line of the wiper electronic controller, so that the influence of large current common ground interference and electromagnetic interference on the wiper electronic controller and vehicle electronic devices is eliminated.

Description

Technical Field

[0001] This application relates to the field of windshield wiper control technology, specifically to a windshield wiper control system. Background Technology

[0002] Windshield wipers are devices used to wipe away raindrops and dust adhering to a vehicle's windshield to improve the driver's visibility and ensure driving safety. Currently, windshield wiper motors are primarily controlled electronically. However, existing electronic control methods have the following drawbacks: 1. The instantaneous large current generated when the motor brakes can interfere with the normal operation of other electronic devices and even cause damage to them; 2. In the fast mode, a high voltage induced electromotive force will be generated in the slow mode circuit, which will damage the components on the slow mode side. 3. The large current generated when the mechanical structure of the wiper is obstructed, as well as the short circuit in the power output line of the wiper electronic controller, can damage the wiper electronic controller and cause the wipers to malfunction. Summary of the Invention

[0003] In view of the deficiencies in the existing technology, the technical problem to be solved by this application is: how to achieve safe control of windshield wipers.

[0004] To achieve the above objectives, this application provides a windshield wiper control system, which includes a windshield wiper electronic controller and a windshield wiper motor; Between the wiper electronic controller and the wiper motor, there are slow power output circuits and fast power output circuits for driving the wiper motor. The system also includes a wiper return detection circuit and a brake control circuit; The wiper return detection circuit is used to detect whether the wiper motor has reached the zero point position of the wiper return line. The wiper electronic controller is used to control the brake control circuit to connect the wiper motor coil and the wiper return line when the wiper motor reaches the zero position of the wiper return line.

[0005] In one embodiment, the slow power output circuit and the fast power output circuit are the same, both including a gate high-side drive control circuit and a first power MOSFET. The drain of the first power MOSFET is connected to the power supply voltage; The gate (G) of the first power MOSFET is connected to the gate high-side drive control circuit; The source (S) terminal of the first power MOSFET is connected to the wiper motor via an alloy resistor.

[0006] In one embodiment, the gate high-side drive control circuit includes a first electronic switch. One end of the first electronic switch is connected to the gate drive voltage, and the other end is connected to the gate of the first power MOSFET through the first current limiting resistor; A first discharge resistor is provided between the first current-limiting resistor and the first power MOSFET, and the output terminal of the first discharge resistor is grounded.

[0007] In one embodiment, a current detection circuit and an overcurrent and short-circuit detection circuit are connected in parallel on the alloy resistor and the drain of the first power MOSFET. The current detection circuit is used to monitor the operating current of the wiper motor in real time. The overcurrent short circuit detection circuit is used to determine whether an overcurrent short circuit has occurred based on the voltage difference between the first power MOSFET and the alloy resistor.

[0008] In one embodiment, a protection control circuit is connected in parallel between the gate of the first power MOSFET and the current detection circuit and the overcurrent and short-circuit detection circuit; the protection control circuit includes a second electronic switch, a second discharge resistor and a second current limiting resistor. The second discharge resistor and the second current-limiting resistor are connected in parallel and connected to the base of the second electronic switch. The emitter of the second electronic switch is connected in parallel with the second discharge resistor and then grounded.

[0009] In one embodiment, the collector of the second electronic switch, the gate of the first power MOSFET, and the first discharge resistor are connected in parallel, and one end of the second current-limiting resistor is connected to the current detection circuit and the overcurrent and short-circuit detection circuit.

[0010] In one embodiment, the wiper motor coil includes a base winding and a fast-speed winding; The output terminal of the slow power output circuit is connected to the base winding through a first diode, wherein the cathode of the first diode is connected to the base winding through a slow line. The basic winding, fast-shift winding, and brake control circuit are connected in parallel and then connected to the output terminal of the fast-shift power output circuit. The output terminal of the fast-shift winding is grounded.

[0011] In one embodiment, after the output terminal of the fast-gear power output circuit is connected to the brake control circuit through the fast-gear line, the basic winding and the fast-gear winding are connected in parallel with the fast-gear line.

[0012] In one embodiment, the brake control circuit includes a second power MOSFET, a third electronic switch, a third discharge resistor, and a third current-limiting resistor. One end of the third electronic switch is connected to the brake drive voltage, and the other end is connected to the input terminal of the third current limiting resistor; The output terminal of the third current-limiting resistor is connected in parallel with the input terminal of the third discharge resistor, and then connected to the gate of the second power MOSFET. The output terminal of the third discharge resistor is grounded. The drain, the output terminal of the base winding, and the fast-mode line of the second power MOSFET are connected in parallel; The source (S) of the second power MOSFET is connected in parallel with the wiper return detection circuit and then connected to the wiper return line.

[0013] In one embodiment, the wiper return detection circuit includes a second diode, a grounding resistor, a pull-up resistor, a fourth current-limiting resistor, and a filter capacitor. The second diode, the fourth current-limiting resistor, and the filter capacitor are connected in parallel and then connected to one end of the pull-up resistor. The other end of the pull-up resistor is connected to the working voltage of the wiper electronic controller, and one end of the filter capacitor is grounded. The cathode of the second diode, the input terminal of the grounding resistor, and the source terminal of the second power MOSFET are connected in parallel and then connected to the wiper return line.

[0014] Compared with the prior art, the advantages of this application are: 1. By directly connecting the brake control circuit to the wiper return line, the large current generated by braking does not flow through the internal ground wire of the wiper electronic controller, eliminating large current grounding interference and reducing the impact of electromagnetic interference on the wiper electronic controller and vehicle electronic components.

[0015] 2. When operating in high speed mode, the slow speed power output circuit is isolated and protected by diodes to block the high voltage induced electromotive force generated by the basic winding and prevent the slow speed power output circuit from being damaged by high voltage.

[0016] 3. The system achieves first-level overcurrent protection through current detection, second-level overcurrent protection through overcurrent and short-circuit detection units and protection control circuits, and third-level overheat protection through alloy resistors. It can cope with various faults such as wiper mechanical obstruction, circuit short circuit, and failure of the first power MOSFET, avoid overheating damage to components, and effectively improve the safety and reliability of the control circuit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a power output circuit diagram in an embodiment of this application; Figure 2 This is a circuit diagram of the wiper motor high-side control and brake control in an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation. First, some of the technical terms used in this application will be explained to help those skilled in the art understand this application.

[0021] Return line: This is the line connected to the return switch. When the wiper motor housing is grounded, the return switch contacts the motor housing when the wiper motor moves to a certain position, and remains disconnected from the motor housing at other positions.

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0023] This application provides a wiper control system, which includes a wiper electronic controller and a wiper motor; Between the wiper electronic controller and the wiper motor, there are slow power output circuits and fast power output circuits for driving the wiper motor. The system also includes a wiper return detection circuit and a brake control circuit; The wiper return detection circuit is used to detect whether the wiper motor has reached the zero point position of the wiper return line. When both the slow and fast power output circuits are off (i.e., in intermittent or off mode), the wiper electronic controller detects whether the wiper motor has reached the zero point of the wiper return line. If so, it controls the brake circuit to connect the wiper motor's fast and return lines, releasing the energy from the wiper motor's coils through the return line. Otherwise, the brake control circuit remains off. This direct energy release via the return line prevents the large current generated by braking from flowing through the wiper electronic controller's internal ground wire, eliminating high-current grounding interference and reducing the impact of electromagnetic interference on the wiper electronic controller and the vehicle's electronic components.

[0024] In one embodiment, reference is made to Figure 1 As shown, the slow power output circuit and the fast power output circuit are the same, both of which include a gate high-side drive control circuit and a first power MOS (Metal Oxide Semiconductor) transistor T1; The drain of the first power MOSFET T1 is connected to the power supply voltage VC; The gate of the first power MOSFET T1 is connected to the gate high-side drive control circuit; The source (S) of the first power MOSFET T1 is connected to the wiper motor via an alloy resistor RL (used as a sensing resistor).

[0025] Furthermore, referring to Figure 1 As shown, the gate high-side drive control circuit includes a first electronic switch K1; One end of the first electronic switch K1 is connected to the gate drive voltage VG, and the other end is connected to the gate of the first power MOSFET T1 through the first current limiting resistor R1. A first discharge resistor R2 is provided between the first current-limiting resistor R1 and the first power MOSFET T1, and the output terminal of the first discharge resistor R2 is grounded.

[0026] When the first electronic switch K1 is closed, the first power MOSFET T1 outputs voltage VOUT through the gate drive voltage VG; when the first electronic switch K1 is open, the first power MOSFET T1 shuts off its output.

[0027] Furthermore, referring to Figure 1 As shown, a current detection circuit and an overcurrent and short-circuit detection circuit are connected in parallel on the alloy resistor RL and the drain of the first power MOSFET T1.

[0028] The current detection circuit is used to monitor the operating current of the wiper motor in real time. This operating current is obtained through the following methods: The power supply voltage VC and voltage VOUT are divided by resistors to obtain the voltage divider signal; The voltage divider signal is differentially amplified to generate the MCU_ADC signal, which is then uploaded to the windshield wiper electronic controller. The wiper electronic controller obtains the output current value of the first power MOSFET T1, which is the operating current of the wiper motor, based on the MCU_ADC signal.

[0029] The overcurrent short-circuit detection circuit is used to determine whether an overcurrent short circuit has occurred based on the voltage difference ΔV (which corresponds to the output current value) between the first power MOSFET T1 and the alloy resistor RL. The determination of this overcurrent short circuit includes the following methods: Monitor the voltage difference ΔV between the first power MOSFET T1 and the alloy resistor RL (this can be monitored through a voltage divider resistor network). When the pressure difference ΔV is determined to be greater than the preset overcurrent threshold or short circuit threshold within a specified time period (the pressure difference ΔV can be determined by setting a comparison circuit and the specified time period can be determined by setting a delay circuit), a fault is determined to have occurred (exceeding the overcurrent threshold is an overcurrent fault, and exceeding the short circuit threshold is a short circuit fault), and then the Cprotect signal is output to the wiper electronic controller.

[0030] Reference Figure 1 As shown, a protection control circuit is connected in parallel between the gate of the first power MOSFET T1 and the current detection circuit and the overcurrent and short circuit detection circuit.

[0031] The aforementioned protection and control circuit includes a second electronic switch Q1 (transistor), a second discharge resistor R3, and a second current-limiting resistor R4; The second discharge resistor R3 and the second current limiting resistor R4 are connected in parallel and connected to the base of the second electronic switch Q1. The emitter of the second electronic switch Q1 is connected in parallel with the second discharge resistor R3 and then grounded.

[0032] Reference Figure 1 As shown, the collector of the second electronic switch Q1, the gate of the first power MOSFET T1, and the first discharge resistor R2 are connected in parallel, and one end of the second current limiting resistor R4 is connected to the current detection circuit and the overcurrent and short circuit detection circuit.

[0033] Based on this, when the Cprotect signal is output to the wiper electronic controller, the protection control circuit is turned on, which can pull down the gate voltage of the first power MOSFET T1, thereby turning off the output of the first power MOSFET T1 and realizing hardware protection against overcurrent and short circuit.

[0034] This system achieves first-level overcurrent protection through current detection, second-level overcurrent protection through the overcurrent and short-circuit detection unit and protection control circuit, and third-level overheat protection through the alloy resistor RL. It can cope with various faults such as mechanical obstruction of the wiper, short circuit in the circuit, and failure of the first power MOSFET T1, avoiding overheating damage to the device and effectively improving safety and reliability.

[0035] In one embodiment, the wiper motor coil includes a base winding and a fast winding; wherein the number of turns in the base winding is L1 and the number of turns in the fast winding is L2. The output terminal of the slow power output circuit is connected to the base winding through the first diode D1, wherein the cathode of the first diode D1 is connected to the base winding through the slow power line. The basic winding, fast-shift winding, and brake control circuit are connected in parallel and then connected to the output terminal of the fast-shift power output circuit. The output terminal of the fast-shift winding is grounded.

[0036] Based on this, when the fast power output circuit is working, only the fast winding is used; when the slow power output circuit is working, the basic winding and the fast winding are used together to form a slow winding with L1+L2 turns.

[0037] In this way, by setting the first diode D1, the slow power output circuit is isolated and protected when the fast mode is working, blocking the high voltage induced electromotive force generated by the basic winding and preventing the slow power output circuit from being damaged by high voltage.

[0038] Furthermore, referring to Figure 2 As shown, after the output terminal of the fast-gear power output circuit is connected to the brake control circuit through the fast-gear line, the basic winding and the fast-gear winding are connected in parallel on the fast-gear line to ensure the parallel connection of the basic winding, the fast-gear winding, and the brake control circuit.

[0039] The reason for connecting the brake control circuit to the fast gear cable instead of the slow gear cable here is as follows: The windshield wiper has four operating modes: high speed, low speed, intermittent speed, and OFF. The mode can only be changed between two adjacent modes. The motor braking is only required when the wiper motor is in the intermittent speed mode (the wiper motor works intermittently) and the OFF speed mode (the wiper motor stops working). In both cases, braking occurs after the power output circuit in the low speed mode has stopped outputting power.

[0040] When the high-speed power output circuit is working, the induced electromotive force generated on the slow-speed line is nearly twice the power supply voltage VC; while when the slow-speed power output circuit is working (i.e., low-speed), the voltage on the high-speed line is only slightly higher than the power supply voltage VC.

[0041] Therefore, if the brake control circuit is connected to the slow gear line, the discharge current will be greater, meaning the brake control circuit will be subjected to a higher voltage surge.

[0042] Alternatively, an overvoltage protection device may need to be added to the brake control circuit.

[0043] After the brake control circuit is connected to the fast gear line, the induced voltage at the fast gear line terminal will decrease. Therefore, when the wiper motor switches from slow gear (i.e., low speed) to OFF, there is no need to add overvoltage protection devices and current limiting resistors to the brake control circuit.

[0044] Therefore, when the brake control circuit is connected to the fast gear line, the brake discharge current can be reduced, and the impact of the high voltage induced electromotive force generated by the basic winding on the brake control circuit can be avoided. This reduces the voltage withstand requirements of the brake control circuit components, thereby reducing the number of external overvoltage protection devices, simplifying the circuit structure, and lowering costs.

[0045] In one embodiment, reference is made to Figure 2As shown, the brake control circuit and the wiper return detection circuit are connected in parallel and then connected to the wiper return line.

[0046] The brake control circuit includes a second power MOSFET T2, a third electronic switch K2, a third discharge resistor R5, and a third current limiting resistor R6; One end of the third electronic switch K2 is connected to the brake drive voltage VL, and the other end is connected to the input of the third current limiting resistor R6. The output terminal of the third current-limiting resistor R6 is connected in parallel with the input terminal of the third discharge resistor R5, and then connected to the gate of the second power MOSFET T2. The output terminal of the third discharge resistor R5 is grounded. The drain of the second power MOSFET T2, the output terminal of the basic winding, and the input terminal of the fast winding are connected in parallel. The output terminal of the fast power output circuit is connected to the drain of the second power MOSFET T2 through the fast line. The source (S) of the second power MOSFET T2 is connected in parallel with the wiper return detection circuit and then connected to the wiper return line.

[0047] Furthermore, referring to Figure 2 As shown, the wiper return detection circuit includes a second diode D2, a grounding resistor R7, a pull-up resistor R8, a fourth current-limiting resistor R9, and a filter capacitor C1. The second diode D2, the fourth current-limiting resistor R9, and the filter capacitor C1 are connected in parallel and then connected to one end of the pull-up resistor R8. The other end of the pull-up resistor R8 is connected to the working voltage VCC of the wiper electronic controller, and one end of the filter capacitor C1 is grounded. The cathode of the second diode D2, the input terminal of the grounding resistor R7, and the source of the second power MOSFET T2 are connected in parallel and then connected to the wiper return line.

[0048] When the wiper motor reaches the zero point of the wiper return line, a low-level MCU_IRQ signal is output through the fourth current-limiting resistor R9 and sent to the wiper electronic controller; when the wiper motor has not reached the zero point of the wiper return line, a high-level MCU_IRQ signal is output through the fourth current-limiting resistor R9 and sent to the wiper electronic controller.

[0049] Based on this, refer to Figure 2 As shown, after the wiper electronic controller receives the low-level MCU_IRQ signal, it sends a CONL signal to the brake control circuit to control the third electronic switch K2 to close. The second power MOSFET T2 is turned on by the brake drive voltage VL, and the energy in the basic winding and fast-shift winding is introduced into the wiper return line for release.

[0050] This braking control only activates when the wiper return line reaches the zero position, ensuring that the wiper blades stop precisely at the fixed position on the windshield, thus improving wiper stopping accuracy.

[0051] The aforementioned wiper motor controls the wiper's high-speed, low-speed, intermittent, and OFF modes by switching on and off the fast-speed and slow-speed power output circuits. Specifically, the fast-speed mode is activated when the fast-speed power output circuit is active, the low-speed mode is activated when the slow-speed power output circuit is active, the intermittent mode is activated when the slow-speed power output circuit is intermittent, and the OFF mode is activated when both the fast and slow-speed power outputs are off.

[0052] The process for controlling the high-speed power output circuit includes: The wiper electronic controller receives the fast mode input command and outputs the CONH signal to the fast mode power output circuit (i.e., the gate high-side drive control circuit). At this time, the first electronic switch K1 in the control fast mode power output circuit is closed, and the first power MOSFET T1 outputs voltage VOUT through the gate drive voltage VG. The voltage VOUT drives the fast mode winding through the fast mode line, so that the wiper motor performs high-speed operation.

[0053] The process for slow-speed power output control includes: The wiper electronic controller receives the slow speed input command and outputs the CONH signal to the slow speed power output circuit (i.e., the gate high-side drive control circuit). At this time, the first electronic switch K1 in the slow speed power output circuit is closed, and the first power MOSFET T1 outputs voltage VOUT through the gate drive voltage VG. After passing through the first diode D1, the voltage VOUT drives the slow speed winding through the slow speed line, so that the wiper motor performs low speed operation.

[0054] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0055] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0056] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0057] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0058] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0059] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0060] The above are merely specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the scope of the claims.

Claims

1. A wiper control system, characterized in that, The system includes an electronic wiper controller and a wiper motor; Between the wiper electronic controller and the wiper motor, there are slow power output circuits and fast power output circuits for driving the wiper motor. The system also includes a wiper return detection circuit and a brake control circuit; The wiper return detection circuit is used to detect whether the wiper motor has reached the zero point position of the wiper return line. The wiper electronic controller is used to control the brake control circuit to connect the wiper motor coil and the wiper return line when the wiper motor reaches the zero position of the wiper return line.

2. The wiper control system as described in claim 1, characterized in that: The slow power output circuit and the fast power output circuit are the same, both including a gate high-side drive control circuit and a first power MOSFET. The drain of the first power MOSFET is connected to the power supply voltage; The gate (G) of the first power MOSFET is connected to the gate high-side drive control circuit; The source (S) terminal of the first power MOSFET is connected to the wiper motor via an alloy resistor.

3. The wiper control system as described in claim 2, characterized in that: The gate high-side drive control circuit includes a first electronic switch. One end of the first electronic switch is connected to the gate drive voltage, and the other end is connected to the gate of the first power MOSFET through the first current limiting resistor; A first discharge resistor is provided between the first current-limiting resistor and the first power MOSFET, and the output terminal of the first discharge resistor is grounded.

4. The wiper control system as described in claim 3, characterized in that: A current detection circuit and an overcurrent and short-circuit detection circuit are connected in parallel on the drain of the alloy resistor and the first power MOSFET. The current detection circuit is used to monitor the operating current of the wiper motor in real time. The overcurrent short circuit detection circuit is used to determine whether an overcurrent short circuit has occurred based on the voltage difference between the first power MOSFET and the alloy resistor.

5. The wiper control system as described in claim 4, characterized in that: A protection control circuit is connected in parallel between the gate of the first power MOSFET and the current detection circuit and the overcurrent and short-circuit detection circuit; the protection control circuit includes a second electronic switch, a second discharge resistor and a second current limiting resistor; The second discharge resistor and the second current-limiting resistor are connected in parallel and connected to the base of the second electronic switch. The emitter of the second electronic switch is connected in parallel with the second discharge resistor and then grounded.

6. The wiper control system as described in claim 5, characterized in that: The collector of the second electronic switch, the gate of the first power MOSFET, and the first discharge resistor are connected in parallel, and one end of the second current-limiting resistor is connected to the current detection circuit and the overcurrent and short-circuit detection circuit.

7. The wiper control system as described in claim 6, characterized in that: The wiper motor coil includes a basic winding and a fast-speed winding; The output terminal of the slow power output circuit is connected to the base winding through a first diode, wherein the cathode of the first diode is connected to the base winding through a slow line. The basic winding, fast-shift winding, and brake control circuit are connected in parallel and then connected to the output terminal of the fast-shift power output circuit. The output terminal of the fast-shift winding is grounded.

8. The wiper control system as described in claim 7, characterized in that: After the output terminal of the fast-gear power output circuit is connected to the brake control circuit through the fast-gear line, the basic winding and the fast-gear winding are connected in parallel with the fast-gear line.

9. The wiper control system as described in claim 8, characterized in that: The brake control circuit includes a second power MOSFET, a third electronic switch, a third discharge resistor, and a third current-limiting resistor. One end of the third electronic switch is connected to the brake drive voltage, and the other end is connected to the input terminal of the third current limiting resistor; The output terminal of the third current-limiting resistor is connected in parallel with the input terminal of the third discharge resistor and then connected to the gate of the second power MOSFET. The output terminal of the third discharge resistor is grounded. The drain, the output terminal of the base winding, and the fast-mode line of the second power MOSFET are connected in parallel; The source (S) of the second power MOSFET is connected in parallel with the wiper return detection circuit and then connected to the wiper return line.

10. The wiper control system as described in claim 9, characterized in that: The wiper return detection circuit includes a second diode, a grounding resistor, a pull-up resistor, a fourth current-limiting resistor, and a filter capacitor. The second diode, the fourth current-limiting resistor, and the filter capacitor are connected in parallel and then connected to one end of the pull-up resistor. The other end of the pull-up resistor is connected to the working voltage of the wiper electronic controller, and one end of the filter capacitor is grounded. The cathode of the second diode, the input terminal of the grounding resistor, and the source terminal of the second power MOSFET are connected in parallel and then connected to the wiper return line.

Images