Electromagnetic brake trailer synchronous braking device

Abstract

The utility model relates to the field of electromagnetic brake trailers, and specifically discloses an electromagnetic brake trailer synchronous braking device, including a synchronous brake control body, a trailer end connector in the form of a plug connected to the left end of the synchronous brake control body, and a tractor end connector in the form of a plug connected to the right end; a controller circuit board is arranged inside the synchronous brake control body, and a synchronous brake controller, a wireless communication module, an accelerometer chip and an external power supply module are arranged on the controller circuit board, and the synchronous brake controller is electrically connected to the trailer end connector, the tractor end connector, the wireless communication module, the accelerometer chip and the external power supply module respectively. The utility model controls the braking force by detecting the acceleration of the tractor to achieve smooth braking, and is connected to the tractor and the trailer end through a connector, which is plug-and-play, reduces the complexity of the wiring between the tractor and the trailer end, reduces the risk of component falling off, and improves safety.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic brake trailers, in particular to a synchronous braking device for electromagnetic brake trailers. Background Art

[0002] The use of passenger cars towing trailers is gradually becoming popular. The brake control of trailers mainly includes impact brakes, electromagnetic brakes, etc. Electromagnetic brakes mainly control the separation and braking of power transmission through direct current. The tractor outputs a brake signal to the trailer, so that the electromagnetic brake coil is energized and closes, outputting braking force.

[0003] The brake synchronizer, which is usually installed later, detects the brake light signal and gradually outputs the maximum braking force according to the time. When the tractor brakes urgently, the brake synchronizer outputs a gradually increasing braking force, and the braking force of the trailer is less than that of the tractor, which creates an impact on the tractor; when the tractor lightly steps on the brake, the brake synchronizer's braking force gradually increases. When it is greater than the braking force of the tractor, it drags the tractor, affecting the driving experience. In addition, due to the need for power supply and parameter adjustment, the brake synchronizer is usually installed in the cab, and the wiring harness needs to be arranged between the tractor and the trailer, which makes installation inconvenient, and there is a risk of the trailer-side wiring harness or brake synchronizer falling off, posing a safety hazard. Summary of the invention

[0004] In order to solve the above problems, the utility model provides an electromagnetic brake trailer synchronous braking device, which controls the braking force by detecting the acceleration of the tractor to achieve smooth braking, and is connected to the tractor and the trailer end through a joint, which is plug-and-play, reducing the complexity of wiring between the tractor and the trailer end, reducing the risk of parts falling off, and improving safety.

[0005] The technical solution of the utility model is: an electromagnetic brake trailer synchronous braking device, including a synchronous braking control body, a trailer end connector in the form of a plug connected to the left end of the synchronous braking control body, and a tractor end connector in the form of a plug; a controller circuit board is arranged inside the synchronous braking control body, and a synchronous braking controller, a wireless communication module, an accelerometer chip and a peripheral power supply module are arranged on the controller circuit board, and the synchronous braking controller is electrically connected to the trailer end connector, the tractor end connector, the wireless communication module, the accelerometer chip and the peripheral power supply module respectively.

[0006] In an optional embodiment, a trailer end socket for inserting the trailer end plug is provided in the trailer end connector, a socket protection cover is provided on the trailer end connector, and the trailer end socket is electrically connected to the synchronous brake controller.

[0007] In an optional embodiment, a tractor-end socket for inserting the tractor-end plug is provided in the tractor-end connector, and the tractor-end socket is electrically connected to the synchronous brake controller.

[0008] In an optional embodiment, a power conversion module is electrically connected between the synchronous brake controller and the peripheral power supply module, and the power conversion module includes a chip U1, a resistor R16, a resistor R17, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C13, a capacitor C27 and a diode D2;

[0009] The anode of the diode D2 is connected to the first power supply voltage, the cathode of the diode D2 is connected to the anode of the capacitor C4, and the cathode of the capacitor C4 is grounded;

[0010] The voltage input terminal of the chip U1 is connected to the cathode of the diode D2, connected to ground via the capacitor C3, and connected to ground via the series resistor R16 and the resistor R17; the voltage output terminal of the chip U1 outputs the second supply voltage, connected to ground via the capacitor C2, connected to the anode of the capacitor C27, and the cathode of the capacitor C27 is connected to ground; the common ground terminal of the chip U1 is grounded;

[0011] A node between the resistor R16 and the resistor R17 is connected to the ground through the capacitor C13 and is connected to the first signal input terminal of the synchronous brake controller.

[0012] In an optional embodiment, the synchronous brake controller is electrically connected to a trailer connection detection module, and the trailer connection detection module includes a resistor R21, a resistor R22, a resistor R88, a resistor R89, a resistor R90, a resistor R91, a resistor R92, a PNP transistor Q12, an NPN transistor Q13, a capacitor C17, and an inductor L1;

[0013] The emitter of the transistor Q12 is connected to the first power supply voltage, the base is connected to the collector of the transistor Q13, and the collector is connected to the first end of the resistor R92; the second end of the resistor R92 is connected to the first end of the resistor R21, and the second end of the resistor R21 is connected to the ground through the resistor R22, to the ground through the capacitor C17, and to the second signal input end of the synchronous brake controller;

[0014] A node between the resistor R92 and the resistor R21 is grounded via the inductor L1;

[0015] The emitter of transistor Q13 is grounded via resistor R91, and the base is grounded via resistors R89 and R90 connected in series;

[0016] The node between the resistor R89 ​​and the resistor R90 is connected to the third signal input terminal of the synchronous brake controller;

[0017] One end of the resistor R88 is connected to the emitter of the transistor Q12, and the other end is connected to the collector of the transistor Q13.

[0018] In an optional embodiment, the synchronous brake controller is electrically connected to an overcurrent detection module, which includes a chip U6, a resistor R63, a resistor R66, a resistor R67, a capacitor C18, a capacitor C21, a capacitor C28 and a capacitor C29;

[0019] The reference voltage pin of the chip U6 is connected to the ground through the capacitor C29 and connected to the second supply voltage through the resistor R63;

[0020] The ground pin of chip U6 is grounded;

[0021] The power supply voltage pin of the chip U6 is connected to the first power supply voltage through one channel and grounded through the capacitor C28 through another channel;

[0022] The first voltage monitoring pin of the chip U6 is connected to the first power supply voltage; the first power supply voltage outputs the monitoring voltage through the resistor R66, and the monitoring voltage is connected to the second voltage monitoring pin of the chip U6;

[0023] The output end of the chip U6 is connected to the ground through the capacitor C18 and connected to the first end of the resistor R67. The second end of the resistor R67 is connected to the ground through the capacitor C21 and connected to the fourth signal input end of the synchronous brake controller.

[0024] In an optional embodiment, the synchronous brake controller is electrically connected to a power control module, and the power control module includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, an NPN transistor Q6, and a P-type MOS transistor Q5;

[0025] The first end of the resistor R11 is connected to the voltage enable pin of the synchronous brake controller, and the second end is connected to the base of the transistor Q6 and grounded via the resistor R12;

[0026] The emitter of the transistor Q6 is grounded, the collector is connected to the second power supply voltage through the resistor R9, and is connected to the gate of the MOS transistor Q5.

[0027] The source of the MOS tube Q5 is connected to the second power supply voltage through one path, and is connected to the drain of the MOS tube Q5 through the resistor R10;

[0028] The drain of MOS tube Q5 outputs the power supply voltage of the accelerometer chip.

[0029] In an optional embodiment, the synchronous brake controller is electrically connected to the tractor end connector through four vehicle light signal acquisition modules with the same structure, and the vehicle light signal acquisition module includes an NPN transistor Qi, a resistor Ri, a resistor Rj and a resistor Rk;

[0030] The first end of the resistor Rj is connected to the output end of the tractor end connector, and the second end is connected to the ground through the resistor Rj and to the base of the transistor Qi;

[0031] The emitter of the transistor Qi is grounded, one of the collectors is connected to the second power supply voltage via the resistor Rk, and the other is connected to the corresponding signal input terminal of the synchronous brake controller.

[0032] In an optional embodiment, the wireless communication module is a Bluetooth module.

[0033] In an optional embodiment, the first signal output terminal and the second signal output terminal of the synchronous brake controller are electrically connected to the trailer end connector respectively, wherein the first signal output terminal outputs a braking force signal, and the second signal output terminal outputs a vehicle light signal.

[0034] The utility model provides an electromagnetic brake trailer synchronous braking device, which has the following beneficial effects compared with the prior art: (1) a wireless communication module and an external power supply module are provided, which can be powered by an external power supply and parameter settings can be performed remotely, and it does not need to be arranged in the cab, but can be installed at the connection between the rear of the tractor and the trailer, thereby reducing the wiring complexity between the tractor and the trailer; (2) it is connected to the tractor and the trailer through a connector, which is plug-and-play, further reducing the wiring complexity between the tractor and the trailer, and reducing the risk of component falling off, thereby improving safety; (3) an accelerometer chip is provided, and the braking force is controlled by detecting the acceleration of the tractor, thereby achieving smooth braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 The utility model provides a structural schematic diagram of an electromagnetic brake trailer synchronous brake device.

[0037] Figure 2 The utility model discloses an exploded structural diagram of an electromagnetic brake trailer synchronous brake device.

[0038] Figure 3 The utility model provides an electromagnetic brake trailer synchronous braking device circuit principle schematic block diagram.

[0039] Figure 4 This is a schematic diagram of the synchronous brake controller circuit.

[0040] Figure 5 This is the circuit diagram of the accelerometer chip.

[0041] Figure 6 It is a circuit diagram of wireless communication module.

[0042] Figure 7 This is a circuit diagram of the headlight signal acquisition module of the driving light.

[0043] Figure 8 This is a circuit diagram of the headlight signal acquisition module for the reversing light.

[0044] Fig. 9 This is the circuit diagram of the left brake light + turn signal acquisition module.

[0045] Fig.10 This is the circuit diagram of the right brake light + steering light signal acquisition module.

[0046] Fig.11 It is a schematic diagram of the power conversion module circuit.

[0047] Fig.12 This is the circuit diagram of the overcurrent detection module.

[0048] Fig.13 It is the circuit diagram of the power control module.

[0049] Fig.14 This is the circuit diagram of the trailer connection detection module.

[0050] In the figure, 1-synchronous braking control body, 2-trailer end connector, 3-tractor end connector, 4-jack protection cover, 5-controller circuit board, 6-trailer end plug, 7-tractor end plug, 8-synchronous braking controller, 9-wireless communication module, 10-accelerometer chip, 11-peripheral power supply module, 12-power conversion module, 13-trailer end socket, 14-tractor end socket, 15-trailer connection detection module, 16-overcurrent detection module, 17-power control module, 18-headlight signal acquisition module. DETAILED DESCRIPTION

[0051] The present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following implementation modes.

[0052] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood by specific circumstances.

[0053] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0054] like Figure 1-Figure 3 As shown, the electromagnetic brake trailer synchronous braking device provided in this embodiment includes a synchronous braking control body 1, the left end of the synchronous braking control body 1 is connected to the trailer end connector 2 in the form of a plug, and the right end is connected to the tractor end connector 3 in the form of a plug. The tractor end connector 3 is connected to the tractor end to receive the headlight signal from the tractor. The trailer end connector 2 is connected to the trailer end to output a braking force control signal and a headlight signal to control the trailer braking and headlight status.

[0055] A trailer end socket 13 for inserting the trailer end plug 6 is provided in the trailer end connector 2, a socket protection cover 4 is provided on the trailer end connector 2, and the trailer end socket 13 is electrically connected to the synchronous brake controller 8. The trailer end connector 2 and the synchronous brake control body 1 can be connected together by laser welding, and the trailer end plug 6 and the trailer end socket 13 are plugged in.

[0056] A tractor-end socket 14 for inserting the tractor-end plug 7 is provided in the tractor-end connector 3, and the tractor-end socket 14 is electrically connected to the synchronous brake controller 8. The tractor-end plug 7 is plugged into the tractor-end socket 14. The device does not need to be installed in the cab, but can be installed at the connection between the rear of the tractor and the trailer.

[0057] A controller 8 circuit board 5 is provided inside the synchronous braking control body 1, and the controller 8 circuit board 5 is installed in a card slot in the synchronous braking control body 1. A synchronous braking controller 8, a wireless communication module 9, an accelerometer chip 10 and an external power supply module 11 are provided on the controller 8 circuit board 5, and the synchronous braking controller 8 is electrically connected to the trailer end connector 2, the tractor end connector 3, the wireless communication module 9, the accelerometer chip 10, and the external power supply module 11 respectively. It can be understood that the synchronous braking controller 8 is electrically connected to the trailer end connector 2 and the tractor end connector 3 respectively, which means that it is electrically connected to the trailer end socket 13 and the tractor end socket 14 respectively.

[0058] like Figure 4-Figure 6As shown, the synchronous brake controller 8 of this embodiment uses a 32-bit high-performance MCU processor as a control chip, selects a 3-axis MESE accelerometer chip 10 for detecting acceleration, and the wireless communication module 9 uses a Bluetooth module to communicate with a mobile phone to complete parameter settings and other data interactions. A battery is selected as the peripheral power supply module 11.

[0059] The first signal output terminal (9 pins) and the second signal output terminal (48 pins) of the synchronous brake controller 8 are electrically connected to the trailer end connector 2, respectively, wherein the first signal output terminal (9 pins) outputs a braking force signal, and the second signal output terminal (48 pins) outputs a headlight signal. The MESE accelerometer chip 10 measures the acceleration of the tractor. After receiving the acceleration, the synchronous brake controller 8 outputs the braking force signal to the trailer end through the first signal output terminal (9 pins) based on the internal preset rules. At the same time, the fifth signal input terminal (30 pins), the sixth signal input terminal (29 pins), the seventh signal input terminal (41 pins), and the eighth signal input terminal (7 pins) of the synchronous brake controller 8 respectively receive the headlight signal sent by the tractor end connector 3, and then transmit the headlight signal to the trailer end through the second signal output terminal (48 pins).

[0060] In this embodiment, the synchronous brake controller 8 is electrically connected to the tractor end connector 3 through four headlight signal acquisition modules 18 of the same structure to collect headlight signals to control the trailer headlights. The headlight signal acquisition module 18 includes an NPN transistor Qi, a resistor Ri, a resistor Rj and a resistor Rk; the first end of the resistor Rj is connected to the output end of the tractor end connector 3, the second end is connected to the ground through the resistor Rj, and the other end is connected to the base of the transistor Qi; the emitter of the transistor Qi is grounded, the collector is connected to the second power supply voltage through the resistor Rk, and the other end is connected to the corresponding signal input end of the synchronous brake controller 8.

[0061] like Figure 7-10 As shown, the driving lights, reversing lights, left brake lights + turn signals, and right brake lights + turn signals are collected respectively and connected to the fifth signal input terminal (30 pins), the sixth signal input terminal (29 pins), the seventh signal input terminal (41 pins), and the eighth signal input terminal (7 pins) of the synchronous controller 8 respectively.

[0062] The battery can provide a 12V voltage. In this embodiment, a power conversion module 12 is electrically connected between the synchronous brake controller 8 and the peripheral power supply module 11 to convert the 12V power supply into a stable 3.3V to provide 3.3V power supply for the entire board.

[0063] like Fig.11 As shown, the power conversion module 12 includes a chip U1, a resistor R16, a resistor R17, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C13, a capacitor C27 and a diode D2.

[0064] The positive electrode of the diode D2 is connected to the first power supply voltage, and the negative electrode is connected to the positive electrode of the capacitor C4, and the negative electrode of the capacitor C4 is grounded; the voltage input end of the chip U1 is connected to the negative electrode of the diode D2, one way is connected to the ground through the capacitor C3, and one way is connected to the ground through the series resistors R16 and R17; the voltage output end of the chip U1 outputs the second power supply voltage, one way is connected to the ground through the capacitor C2, one way is connected to the positive electrode of the capacitor C27, and the negative electrode of the capacitor C27 is grounded; the common ground terminal of the chip U1 is grounded; the node between the resistor R16 and the resistor R17 is grounded through the capacitor C13, and one way is connected to the first signal input terminal (pin 20) of the synchronous brake controller 8.

[0065] The power conversion module 12 converts the 12V power supply into a stable 3.3V, providing 3.3V power supply for the entire board.

[0066] This embodiment also provides an overcurrent detection module 16 for overcurrent protection. The overcurrent detection module 16 is electrically connected to the synchronous brake controller 8. Fig.12 As shown, the overcurrent detection module 16 includes a chip U6, a resistor R63, a resistor R66, a resistor R67, a capacitor C18, a capacitor C21, a capacitor C28 and a capacitor C29.

[0067] The reference voltage pin (pin 6) of chip U6 is connected to ground via capacitor C29 and to the second power supply voltage via resistor R63; the ground pin of chip U6 is grounded; the power supply voltage pin (pin 4) of chip U6 is connected to the first power supply voltage and to ground via capacitor C28; the first voltage monitoring pin (pin 3) of chip U6 is connected to the first power supply voltage; the first power supply voltage outputs the monitoring voltage via resistor R66, and the monitoring voltage is connected to the second voltage monitoring pin (pin 2) of chip U6; the output end of chip U6 is grounded via capacitor C18 and to the first end of resistor R67; the second end of resistor R67 is grounded via capacitor C21 and to the fourth signal input end (pin 21) of the synchronous braking controller 8.

[0068] The overcurrent detection module 16 is used to detect the magnitude of the trailer control output current to prevent the device from being burned due to excessive current.

[0069] This embodiment is also provided with a power supply control module 17 to reduce energy consumption, and the power supply control module 17 is electrically connected to the synchronous brake controller 8. Fig.13 As shown, the power control module 17 includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, an NPN transistor Q6 and a P-type MOS transistor Q5.

[0070] The first end of the resistor R11 is connected to the voltage enable pin of the synchronous brake controller 8, and the second end is connected to the base of the transistor Q6 and grounded through the resistor R12; the emitter of the transistor Q6 is grounded, the collector is connected to the second power supply voltage through the resistor R9 and connected to the gate of the MOS transistor Q5; the source of the MOS transistor Q5 is connected to the second power supply voltage and connected to the drain of the MOS transistor Q5 through the resistor R10; the drain of the MOS transistor Q5 outputs the power supply voltage of the accelerometer chip 10.

[0071] The power control module 17 is used to control the power supply of the accelerometer chip 10. When the device is in sleep mode, the MOS tube Q5 is turned off to turn off the power supply of the accelerometer chip 10, thereby reducing power consumption.

[0072] This embodiment also provides a trailer connection detection module 15, which is electrically connected to the synchronous brake controller 8 to detect and confirm the trailer connection state to ensure reliable operation of the synchronous brake. Fig.14 As shown, the trailer connection detection module 15 includes a resistor R21, a resistor R22, a resistor R88, a resistor R89, a resistor R90, a resistor R91, a resistor R92, a PNP transistor Q12, an NPN transistor Q13, a capacitor C17, and an inductor L1.

[0073] The emitter of transistor Q12 is connected to the first power supply voltage, the base is connected to the collector of transistor Q13, and the collector is connected to the first end of resistor R92; the second end of resistor R92 is connected to the first end of resistor R21, the second end of resistor R21 is grounded via resistor R22, grounded via capacitor C17, and connected to the second signal input end (pin 18) of the synchronous brake controller 8; the node between resistor R92 and resistor R21 is grounded via inductor L1; the emitter of transistor Q13 is grounded via resistor R91, and the base is grounded via series resistors R89 and R90; the node between resistor R89 ​​and resistor R90 is connected to the third signal input end (pin 23) of the synchronous brake controller 8; one end of resistor R88 is connected to the emitter of transistor Q12, and the other end is connected to the collector of transistor Q13.

[0074] The trailer connection detection module 15 is used to confirm the trailer connection status (connected state, disconnected state, normal state). A fixed pulse is sent to the trailer control line through the control pin, and then the trailer control line level is collected to confirm the trailer connection status. Specifically, the *Trailer-Link-Check pin is controlled to send periodic detection pulses, and the voltage signal is collected through the *Trailer-Link-ADC pin to calculate the equivalent DC internal resistance of L1. If the equivalent DC internal resistance is greater than 0.6Ω and less than 200Ω, it is determined that the trailer connection is normal. If the equivalent DC internal resistance is less than 0.6Ω, it is determined that the trailer is short-circuited. If the equivalent DC internal resistance is greater than 200Ω, it is determined that the trailer is not connected.

[0075] The above disclosure is only the preferred implementation mode of the utility model, but the utility model is not limited thereto. Any non-creative changes that can be thought of by technicians in this field, as well as several improvements and modifications made without departing from the principle of the utility model, should fall within the scope of protection of the utility model.

Claims

1. An electromagnetic brake trailer synchronous braking device, characterized in that: It includes a synchronous braking control body, the left end of the synchronous braking control body is connected to the trailer end connector in the form of a plug, and the right end is connected to the tractor end connector in the form of a plug; a controller circuit board is arranged inside the synchronous braking control body, and a synchronous braking controller, a wireless communication module, an accelerometer chip and a peripheral power supply module are arranged on the controller circuit board; the synchronous braking controller is electrically connected to the trailer end connector, the tractor end connector, the wireless communication module, the accelerometer chip and the peripheral power supply module respectively.

2. The electromagnetic brake trailer synchronous braking device according to claim 1, characterized in that: A trailer end socket for inserting a trailer end plug is arranged in the trailer end connector, a socket protection cover is arranged on the trailer end connector, and the trailer end socket is electrically connected to the synchronous brake controller.

3. The electromagnetic brake trailer synchronous braking device according to claim 2, characterized in that: A tractor-end socket for inserting a tractor-end plug is arranged in the tractor-end connector, and the tractor-end socket is electrically connected to the synchronous brake controller.

4. The electromagnetic brake trailer synchronous braking device according to any one of claims 1 to 3, characterized in that: A power conversion module is electrically connected between the synchronous brake controller and the peripheral power supply module, and the power conversion module includes a chip U1, a resistor R16, a resistor R17, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C13, a capacitor C27 and a diode D2; The anode of the diode D2 is connected to the first power supply voltage, the cathode of the diode D2 is connected to the anode of the capacitor C4, and the cathode of the capacitor C4 is grounded; The voltage input terminal of the chip U1 is connected to the cathode of the diode D2, connected to ground via the capacitor C3, and connected to ground via the series resistor R16 and the resistor R17; the voltage output terminal of the chip U1 outputs the second supply voltage, connected to ground via the capacitor C2, connected to the anode of the capacitor C27, and the cathode of the capacitor C27 is connected to ground; the common ground terminal of the chip U1 is grounded; A node between the resistor R16 and the resistor R17 is connected to the ground through the capacitor C13 and is connected to the first signal input terminal of the synchronous brake controller.

5. The electromagnetic brake trailer synchronous braking device according to claim 4, characterized in that: The synchronous brake controller is electrically connected to a trailer connection detection module, which includes a resistor R21, a resistor R22, a resistor R88, a resistor R89, a resistor R90, a resistor R91, a resistor R92, a PNP transistor Q12, an NPN transistor Q13, a capacitor C17, and an inductor L1; The emitter of the transistor Q12 is connected to the first power supply voltage, the base is connected to the collector of the transistor Q13, and the collector is connected to the first end of the resistor R92; the second end of the resistor R92 is connected to the first end of the resistor R21, and the second end of the resistor R21 is connected to the ground through the resistor R22, to the ground through the capacitor C17, and to the second signal input end of the synchronous brake controller; A node between the resistor R92 and the resistor R21 is grounded via the inductor L1; The emitter of transistor Q13 is grounded via resistor R91, and the base is grounded via resistors R89 and R90 connected in series; The node between the resistor R89 ​​and the resistor R90 is connected to the third signal input terminal of the synchronous brake controller; One end of the resistor R88 is connected to the emitter of the transistor Q12, and the other end is connected to the collector of the transistor Q13.

6. The electromagnetic brake trailer synchronous braking device according to claim 4, characterized in that: The synchronous brake controller is electrically connected to an overcurrent detection module, which includes a chip U6, a resistor R63, a resistor R66, a resistor R67, a capacitor C18, a capacitor C21, a capacitor C28 and a capacitor C29; The reference voltage pin of the chip U6 is connected to the ground through the capacitor C29 and connected to the second supply voltage through the resistor R63; The ground pin of chip U6 is grounded; The power supply voltage pin of the chip U6 is connected to the first power supply voltage through one channel and grounded through the capacitor C28 through another channel; A first voltage monitoring pin of the chip U6 is connected to a first power supply voltage; The first supply voltage outputs a monitoring voltage through the resistor R66, and the monitoring voltage is connected to the second voltage monitoring pin of the chip U6; The output end of the chip U6 is connected to the ground through the capacitor C18 and connected to the first end of the resistor R67. The second end of the resistor R67 is connected to the ground through the capacitor C21 and connected to the fourth signal input end of the synchronous brake controller.

7. The electromagnetic brake trailer synchronous braking device according to claim 4, characterized in that: The synchronous brake controller is electrically connected to a power control module, which includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, an NPN transistor Q6 and a P-type MOS transistor Q5; The first end of the resistor R11 is connected to the voltage enable pin of the synchronous brake controller, and the second end is connected to the base of the transistor Q6 and grounded via the resistor R12; The emitter of the transistor Q6 is grounded, the collector is connected to the second power supply voltage through the resistor R9, and is connected to the gate of the MOS transistor Q5. The source of the MOS tube Q5 is connected to the second power supply voltage through one path, and is connected to the drain of the MOS tube Q5 through the resistor R10; The drain of MOS tube Q5 outputs the power supply voltage of the accelerometer chip.

8. The electromagnetic brake trailer synchronous braking device according to claim 4, characterized in that: The synchronous brake controller is electrically connected to the tractor end connector through four vehicle light signal acquisition modules with the same structure. The vehicle light signal acquisition module includes an NPN transistor Qi, a resistor Ri, a resistor Rj and a resistor Rk; The first end of the resistor Rj is connected to the output end of the tractor end connector, and the second end is connected to the ground through the resistor Rj and to the base of the transistor Qi; The emitter of the transistor Qi is grounded, one of the collectors is connected to the second power supply voltage via the resistor Rk, and the other is connected to the corresponding signal input terminal of the synchronous brake controller.

9. The electromagnetic brake trailer synchronous braking device according to claim 8, characterized in that: The wireless communication module is a Bluetooth module.

10. The electromagnetic brake trailer synchronous braking device according to claim 8, characterized in that: The first signal output terminal and the second signal output terminal of the synchronous brake controller are electrically connected to the trailer end connector respectively, wherein the first signal output terminal outputs a braking force signal, and the second signal output terminal outputs a vehicle light signal.

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