Hand brake unit, control method, electronic device, and electronic brake control system

Abstract

The application relates to the brake technology field and provides a hand brake unit, a control method, an electronic device and an electronic brake control system. The hand brake unit comprises a trailer first control valve with a first channel and a second channel which are selectively connected, a main vehicle air supply pipeline connected with an air source and a main vehicle brake air chamber, a main vehicle exhaust pipeline selectively connected with the main vehicle air supply pipeline and connected with the main vehicle brake air chamber and an exhaust port, and a trailer cooperative control pipeline connected with the main vehicle air supply pipeline and the main vehicle exhaust pipeline and connected with the trailer brake air chamber through the first channel; the hand brake unit further comprises a trailer second control valve, the trailer brake air chamber is connected with the exhaust port through the second channel and the trailer second control valve to form a trailer exhaust pipeline, and the hand brake unit has a trailer independent brake state in which the main vehicle air supply pipeline and the trailer exhaust pipeline are connected. The hand brake unit has a trailer independent brake function, meets the demand of a driver for trailer deceleration or brake during driving, and improves the driving experience of intelligent commercial vehicles.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and more specifically, to a handbrake unit, a control method, an electronic device, and an electronic braking control system. Background Technology

[0002] With the increasing prevalence of electronic and intelligent applications, vehicle braking systems are gradually being upgraded to electrical signal control and can be equipped with other vehicle signals to achieve more precise, flexible, and safer braking control. The EPH (ElectroPneumatic Hand Brake) is a prime example of such a product. It consists of an electronic switch and a hand valve body. The valve body's state, specifically the flow of gas within it, is controlled by the electronic switch and signals from the ECU (Electronic Control Unit), thereby controlling the braking and release at the vehicle's wheels.

[0003] Currently, the application of handbrake units is gradually expanding from passenger cars to commercial vehicles. Unlike passenger cars, most commercial vehicles are equipped with trailers, and during vehicle operation, there is a need for the trailer to decelerate or brake independently. Existing handbrake units can control the simultaneous braking or movement of the main vehicle and trailer by pushing and pulling electronic control switches or vehicle ECU signals, but they cannot achieve independent braking control of the trailer.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a handbrake unit, a control method, an electronic device, and an electronic brake control system, which have independent braking function for trailers, meet the needs of trailer deceleration and braking during driving, and improve the driving experience of intelligent commercial vehicles.

[0006] One aspect of the present invention provides a handbrake unit, comprising a trailer first control valve having a first channel and a second channel that can be selectively connected, a main vehicle air supply line connecting an air source and a main vehicle brake chamber, a main vehicle exhaust line selectively connected to the main vehicle air supply line and connecting the main vehicle brake chamber and an exhaust port, and a trailer coordination control line connecting the main vehicle air supply line and the main vehicle exhaust line and connected to the trailer brake chamber via the first channel; the handbrake unit further comprises: a trailer second control valve disposed in the trailer exhaust line, the trailer exhaust line being connected from the trailer brake chamber via the second channel and the trailer second control valve to the exhaust port; the handbrake unit has a trailer independent braking state, in which the main vehicle air supply line and the trailer exhaust line are connected.

[0007] In some embodiments, the handbrake unit further includes: a trailer third control valve, disposed in the trailer air supply line, the trailer air supply line being connected from the air source through the trailer third control valve and the second channel to the trailer brake chamber; the handbrake unit also has a trailer brake release state, in which the trailer second control valve is cut off, and the main vehicle air supply line and the trailer air supply line are connected.

[0008] In some embodiments, the handbrake unit further comprises: a simultaneous driving state of the main vehicle and trailer, wherein in the simultaneous driving state of the main vehicle and trailer, the main vehicle air supply line and the trailer coordinated control line are connected; a simultaneous braking state of the main vehicle and trailer, wherein in the simultaneous braking state of the main vehicle and trailer, the main vehicle exhaust line and the trailer coordinated control line are connected; and a trailer inspection state, wherein in the trailer inspection state, the trailer second control valve is cut off, and the main vehicle exhaust line and the trailer air supply line are connected.

[0009] In some embodiments, the handbrake unit further includes: a relay valve having a control chamber and an air supply passage and an exhaust passage that can be selectively connected, wherein the main vehicle air supply line is connected from the air source to the main vehicle brake chamber via the air supply passage, and the main vehicle exhaust line is connected from the main vehicle brake chamber to the exhaust port via the exhaust passage; a main vehicle air supply control line connecting the air source and the control chamber and a main vehicle exhaust control line connecting the control chamber and the exhaust port, wherein the main vehicle air supply line is connected when the main vehicle air supply control line is connected, and the main vehicle exhaust line is connected when the main vehicle exhaust control line is connected.

[0010] In some embodiments, the handbrake unit further includes a first control valve for the main vehicle and a second control valve for the main vehicle, which have a third channel and a fourth channel that can be selectively switched on. The main vehicle air supply control line is connected from the air source to the control chamber via the third channel and the second control valve for the main vehicle, and the main vehicle exhaust control line is connected from the control chamber to the exhaust port via the second control valve for the main vehicle and the fourth channel for the main vehicle.

[0011] In some embodiments, the handbrake unit further includes: a first air pressure sensor connected to the trailer cooperative control pipeline; and / or a second air pressure sensor connected to the trailer brake chamber.

[0012] In some embodiments, each control valve is integrated into a hand valve body and connected to an electronic control unit; the hand valve body is also connected to the tractor's electronic control switch and the trailer's electronic control switch.

[0013] Another aspect of the present invention provides an electronic braking control system, wherein the electronic braking control system is configured with a handbrake unit as described in any of the above embodiments.

[0014] Another aspect of the present invention provides a control method for a handbrake unit, for controlling the handbrake unit as described in any of the above embodiments, comprising: responding to a trailer independent braking demand signal, connecting the main vehicle air supply line, and connecting the second channel and the trailer second control valve to connect the trailer exhaust line.

[0015] In some embodiments, the handbrake unit further includes a third trailer control valve disposed in the trailer air supply line, the trailer air supply line being connected from the air source through the third trailer control valve and the second channel to the trailer brake chamber; the control method further includes: in response to a trailer brake release demand signal, opening the main vehicle air supply line, closing the second trailer control valve, and connecting the second channel and the third trailer control valve to open the trailer air supply line.

[0016] In some embodiments, the control method further includes: responding to a simultaneous driving demand signal of the main vehicle and trailer, connecting the main vehicle air supply line and the first channel to connect the trailer cooperative control line; responding to a simultaneous braking demand signal of the main vehicle and trailer, connecting the main vehicle exhaust line and the first channel to connect the trailer cooperative control line; responding to a trailer inspection demand signal, connecting the main vehicle exhaust line, closing the trailer second control valve, and connecting the trailer third control valve and the second channel to connect the trailer air supply line.

[0017] Another aspect of the present invention provides an electronic device for implementing the control method as described in any of the above embodiments.

[0018] The beneficial effects of this invention compared to the prior art include at least the following:

[0019] The existing handbrake unit achieves synchronous control of the trailer and the tractor through the trailer coordination control pipeline. When the tractor's air supply pipeline and the trailer coordination control pipeline are connected, the trailer and the tractor move simultaneously. When the tractor's exhaust pipeline and the trailer coordination control pipeline are connected, the trailer and the tractor brake simultaneously.

[0020] The handbrake unit of this invention adds a second trailer control valve, forming a trailer exhaust pipe that connects the trailer brake chamber through a second channel of the first trailer control valve and the exhaust port of the second trailer control valve. When the trailer cooperative control pipe is cut off while the main vehicle air supply pipe and the trailer exhaust pipe are connected, the main vehicle drives normally while the trailer brakes independently. This achieves the trailer independent braking function, meets the trailer deceleration and braking needs during driving, and improves the driving experience of intelligent commercial vehicles.

[0021] The handbrake unit of the present invention adds independent control of the trailer, which is possible in the case of existing EPH which can control the tractor and trailer at the same time, so as to achieve more comprehensive and precise control of the driving and braking of the tractor and trailer and improve driving safety.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0024] Figures 1 to 5 A schematic diagram of the handbrake unit in an embodiment of the present invention is shown;

[0025] in, Figure 1 The indicator shows the conductive lines in the trailer's independent braking state. Figure 2 The marking indicates the conductive lines when the trailer brake is released. Figure 3 The indicator shows the connecting pipeline when the main trailer and the trailer are traveling simultaneously. Figure 4 The indicator shows the conductive lines when the main trailer is braking simultaneously. Figure 5 The indicator shows the connecting lines in the trailer inspection status;

[0026] Figure 6 The diagram illustrates the steps of the control method in an embodiment of the present invention. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully and completely convey the concept of the exemplary embodiments to those skilled in the art.

[0028] The accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0029] Furthermore, the process illustrated in the accompanying drawings is merely illustrative and does not necessarily include all steps. For example, some steps may be broken down, some steps may be combined or partially combined, and the actual execution order may change depending on the actual situation. The terms "first," "second," "third," and similar words used in the specific description do not indicate any order, quantity, or importance, but are only used to distinguish different components.

[0030] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features in different embodiments can be combined with each other.

[0031] Reference Figures 1 to 5 As shown, the handbrake unit provided in this embodiment of the invention includes:

[0032] The trailer first control valve 20 has a first channel 20a and a second channel 20b that can be selectively connected; a main vehicle air supply line P1 that connects the air source 11 and the main vehicle brake chamber 15; a main vehicle exhaust line P2 that is selectively connected to the main vehicle air supply line P1 and connects the main vehicle brake chamber 15 and the exhaust port 12; and a trailer cooperative control line P3 that connects the main vehicle air supply line P1 and the main vehicle exhaust line P2 and is connected to the trailer brake chamber 16 via the first channel 20a.

[0033] The trailer second control valve 30 is installed in the trailer exhaust pipe P4. The trailer exhaust pipe P4 is connected from the trailer brake air chamber 16 through the second channel 20b and the trailer second control valve 30 to the exhaust port 12.

[0034] The handbrake unit has an independent trailer braking state. In the independent trailer braking state, the main vehicle air supply line P1 and the trailer exhaust line P4 are connected.

[0035] The existing handbrake unit achieves synchronous control of the trailer and the tractor through the trailer coordination control pipeline P3. When the tractor's air supply pipeline P1 and the trailer coordination control pipeline P3 are connected, the trailer and the tractor move simultaneously. When the tractor's exhaust pipeline P2 and the trailer coordination control pipeline P3 are connected, the trailer and the tractor brake simultaneously.

[0036] The handbrake unit of the present invention adds a second trailer control valve 30 to form a trailer exhaust pipe P4 that connects the trailer brake air chamber 16 to the exhaust port 12 via the second channel 20b of the first trailer control valve 20 and the second trailer control valve 30. When the trailer cooperative control pipe P3 is cut off and the main vehicle air supply pipe P1 and the trailer exhaust pipe P4 are connected, the main vehicle drives normally while the trailer brakes independently. This realizes the trailer independent braking function, meets the needs of trailer deceleration and braking during driving, and improves the driving experience of intelligent commercial vehicles.

[0037] The handbrake unit of the present invention adds independent control of the trailer, which is possible in the case of existing EPH which can control the tractor and trailer at the same time, so as to achieve more comprehensive and precise control of the driving and braking of the tractor and trailer and improve driving safety.

[0038] In some embodiments, the handbrake unit further includes:

[0039] The trailer third control valve 40 is installed in the trailer air supply line P5. The trailer air supply line P5 is connected from the air source 11 to the trailer brake air chamber 16 via the trailer third control valve 40 and the second channel 20b.

[0040] The handbrake unit also has a trailer brake release state. In the trailer brake release state, the trailer second control valve 30 is cut off, and the main vehicle air supply line P1 and the trailer air supply line P5 are connected.

[0041] When the trailer brake is released, the trailer's independent brake is released, and the trailer coordination control line P3 can be connected to make the trailer follow the tractor vehicle.

[0042] In some embodiments, the handbrake unit further comprises:

[0043] When the main vehicle and trailer are traveling simultaneously, the main vehicle air supply line P1 and the trailer coordination control line P3 are connected.

[0044] When the main vehicle and trailer are braking simultaneously, the exhaust pipe P2 of the main vehicle and the coordinated control pipe P3 of the trailer are connected.

[0045] Trailer inspection status: In trailer inspection status, trailer second control valve 30 is cut off, and main vehicle exhaust pipe P2 and trailer air supply pipe P5 are connected.

[0046] When the trailer is under inspection, the tractor unit remains braked while the trailer is unbraked to allow for trailer inspection.

[0047] The handbrake valve of the present invention can not only control the simultaneous driving and braking of the main trailer and realize trailer inspection control, but also realize independent trailer braking function. It can perform independent trailer braking control and release the independent trailer braking when needed, thereby optimizing the driving experience and enhancing driving safety.

[0048] In some embodiments, the handbrake unit further includes:

[0049] A relay valve 50 has a control chamber and an air supply channel 52 and an exhaust channel 53 that can be selectively connected. The main vehicle air supply line P1 is connected from the air source 11 to the main vehicle brake chamber 15 via the air supply channel 52, and the main vehicle exhaust line P2 is connected from the main vehicle brake chamber 15 to the exhaust port 12 via the exhaust channel 53.

[0050] The main vehicle air supply control line P6 connects the air source 11 and the control chamber, and the main vehicle exhaust control line P7 connects the control chamber and the exhaust port 12. The main vehicle air supply line P1 is connected when the main vehicle air supply control line P6 is connected, and the main vehicle exhaust line P2 is connected when the main vehicle exhaust control line P7 is connected.

[0051] Air is supplied to the control chamber of relay valve 50 via the main vehicle air supply control line P6, opening the air supply passage 52 of relay valve 50 and thus connecting the main vehicle air supply line P1. Meanwhile, the gas in the control chamber of relay valve 50 is vented via the main vehicle exhaust control line P7, opening the exhaust passage 53 of relay valve 50 and closing the air supply passage 52, thus connecting the main vehicle exhaust line P2 and cutting off the main vehicle air supply line P1. This achieves control over the main vehicle air supply line P1 and the main vehicle exhaust line P2.

[0052] In some embodiments, the handbrake unit further includes a first control valve 60 for the main vehicle and a second control valve 70 for the main vehicle, which have a third channel 63 and a fourth channel 64 that can be selectively switched on. The main vehicle air supply control line P6 is connected from the air source 11 to the control chamber of the relay valve 50 via the third channel 63 and the second control valve 70. The main vehicle exhaust control line P7 is connected from the control chamber of the relay valve 50 to the exhaust port 12 via the second control valve 70 and the fourth channel 64.

[0053] The main vehicle first control valve 60 and the main vehicle second control valve 70 are used to control the opening and closing of the main vehicle air supply control line P6 and the main vehicle exhaust control line P7, thereby controlling the opening and closing of the main vehicle air supply line P1 and the main vehicle exhaust line P2.

[0054] Furthermore, the control chamber of the relay valve 50 is also connected to the control air source 18. The control air source 18 and the main vehicle second control valve 70 can be connected to the control chamber via a two-way check valve. Specifically, the air source 11 can be an air reservoir, and the control air source 18 can be a foot valve, but is not limited thereto.

[0055] In some embodiments, the handbrake unit further includes: a first air pressure sensor 82 connected to the trailer cooperative control line P3; and / or a second air pressure sensor 84 connected to the trailer brake chamber 16.

[0056] The first air pressure sensor 82 and the second air pressure sensor 84 are used to monitor the air pressure in the trailer cooperative control pipeline P3 and the air pressure in the trailer brake chamber 16, so as to adjust the control strategy according to the monitored air pressure.

[0057] In the above embodiments, the main vehicle first control valve 60, the main vehicle second control valve 70, the trailer first control valve 20, the trailer second control valve 30, and the trailer third control valve 40 can all be solenoid valves to facilitate and accurately control the air circuit through energization / de-energization. Specifically, the main vehicle first control valve 60 can be a dual-coil solenoid valve, where the third channel 63 is closed when the 60a coil is energized, and the fourth channel 64 is closed when the 60b coil is energized; the main vehicle second control valve 70, the trailer second control valve 30, and the trailer third control valve 40 can all connect their internal air circuits when energized; the trailer first control valve 20 can connect the second channel 20b when energized and connect the first channel 20a when de-energized.

[0058] In the actual product, all control valves, including the main vehicle first control valve 60, the main vehicle second control valve 70, the trailer first control valve 20, the trailer second control valve 30, and the trailer third control valve 40, as well as relay valve 50, first air pressure sensor 82, and second air pressure sensor 84, can be integrated into the hand valve body. All the electronic control components are connected to the electronic control unit 80, enabling them to perform corresponding operations under the control of the ECU signal from the electronic control unit 80. The hand valve body is also connected to the main vehicle electronic control switch and the trailer electronic control switch. The main vehicle electronic control switch allows control of the handbrake unit's simultaneous driving state of the main vehicle and trailer, simultaneous braking state of the main vehicle and trailer, and trailer inspection state. The trailer electronic control switch allows control of the handbrake unit's independent trailer braking state and trailer brake release state, thereby achieving flexible and accurate control of the commercial vehicle.

[0059] This invention also provides an electronic braking control system (EBS) configured with a handbrake unit as described in any of the above embodiments. The electronic braking control system (EBS) configured with the aforementioned handbrake unit can, in addition to controlling the simultaneous movement and braking of the main trailer and enabling trailer inspection control, also achieve independent trailer braking function. It can perform independent trailer braking control and release the independent trailer braking when needed, thereby optimizing the driving experience and enhancing driving safety.

[0060] This invention also provides a control method for a handbrake unit, used to control the handbrake unit as described in any of the above embodiments. Figure 6 This demonstrates the main steps of the control method for the handbrake unit, combined with... Figures 1 to 6 As shown, the control method for the handbrake unit may include one or more of the following steps:

[0061] S610, in response to the trailer's independent braking demand signal, connects the main vehicle air supply line P1 and connects the second channel 20b and the trailer's second control valve 30 to connect the trailer's exhaust line P4.

[0062] S620, in response to the trailer brake release demand signal, opens the main vehicle air supply line P1, closes the trailer second control valve 30, and connects the second channel 20b and the trailer third control valve 40 to open the trailer air supply line P5.

[0063] S630, in response to the signal requiring simultaneous operation of the main vehicle and trailer, connects the main vehicle air supply line P1 and connects the first channel 20a to connect the trailer coordination control line P3.

[0064] S640, in response to the signal requiring simultaneous braking of the main vehicle and trailer, activates the exhaust pipe P2 of the main vehicle and connects the first channel 20a to activate the trailer coordination control pipe P3.

[0065] S650, in response to a trailer inspection request signal, connects the main vehicle exhaust pipe P2, closes the trailer second control valve 30, and connects the trailer third control valve 40 and the second channel 20b to connect the trailer air supply pipe P5.

[0066] Figure 6 This invention merely demonstrates feasible steps of the control method for the handbrake unit of the present invention. Each step can be implemented independently or in combination, and the execution order of the steps is not fixed. Figure 6 For the purposes of this invention, the splitting, merging, sequential exchange, and other synchronous or asynchronous execution methods of the steps are all within the scope of protection of this invention.

[0067] The required signals can be ECU signals issued by the vehicle or generated based on the operation of the main vehicle's electronic control switch / trailer's electronic control switch; the opening / closing of each pipeline can be achieved by controlling the energization / de-energization of each control valve (solenoid valve).

[0068] The control method of the handbrake unit of the present invention can not only control the simultaneous driving and braking of the main trailer and realize trailer inspection control, but also realize independent trailer braking control and release the independent trailer braking when needed, thereby optimizing the driving experience and enhancing driving safety.

[0069] This invention also provides an electronic device that can be used to implement the control method described in any of the above embodiments, so as to realize functions such as simultaneous driving control of the main vehicle and trailer, simultaneous braking control of the main vehicle and trailer, trailer inspection control, independent braking control of the trailer, and trailer brake release control, thereby optimizing the driving experience of commercial vehicles and enhancing driving safety.

[0070] Electronic devices can be configured independently in a vehicle or integrated into the vehicle's controller, such as the Electronic Control Unit (ECU). Electronic devices can take several forms, including the following.

[0071] It can be expressed in the form of a functional (program) module architecture, which may include modules that implement each step of the control method described above, such as modules for implementing steps S610, S620, S630, S640, and S650.

[0072] In the form of a general-purpose computing device, it may include a processing unit and a storage unit. The storage unit stores executable instructions, which, when executed by the processing unit, implement the control method described in any of the above embodiments.

[0073] The storage unit may include programs / utilities with one or more program modules, including but not limited to: an operating system, one or more application programs, other program modules, and program data. The general-purpose computing device also includes a bus connecting the processing unit and the storage unit, as well as other platform components. This bus may include a storage unit bus, a peripheral bus, a graphics acceleration port, a processing unit bus, and other local area buses. The general-purpose computing device can also communicate with one or more external devices, other computing devices in the vehicle, networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks such as the Internet).

[0074] It is represented in the form of a storage medium, in which a program is stored, which, when executed, implements the control method described in any of the above embodiments.

[0075] The storage medium can be any tangible medium that contains or stores a program, specifically any combination of one or more readable media, which can be a readable signal medium or a readable storage medium. The program can be used or combined with an instruction execution system, apparatus, or device. The program can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device, for example, via the Internet using an Internet service provider.

[0076] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A handbrake unit, comprising a trailer first control valve having a first channel and a second channel that can be selectively connected, a main vehicle air supply line connecting an air source and a main vehicle brake chamber, a main vehicle exhaust line selectively connected to the main vehicle air supply line and connecting the main vehicle brake chamber and an exhaust port, and a trailer coordination control line connecting the main vehicle air supply line and the main vehicle exhaust line and connected to the trailer brake chamber via the first channel; Its features are, The handbrake unit also includes: The trailer second control valve is installed in the trailer exhaust pipe, which is connected to the exhaust port from the trailer brake air chamber via the second channel and the trailer second control valve; The trailer third control valve is installed in the trailer air supply line, which is connected from the air source through the trailer third control valve and the second channel to the trailer brake air chamber. The handbrake unit can have the following operating states: In the trailer independent braking state, the main vehicle air supply line and the trailer exhaust line are connected so that the main vehicle can drive normally while the trailer brakes independently. In the trailer brake release state, the trailer second control valve is cut off, and the main vehicle air supply line and the trailer air supply line are connected. In the trailer inspection state, the trailer's second control valve is closed, and the main vehicle's exhaust pipe and the trailer's air supply pipe are connected.

2. The handbrake unit as described in claim 1, characterized in that, It also has: When the main vehicle and trailer are traveling simultaneously, the air supply line of the main vehicle and the coordinated control line of the trailer are connected. When the main vehicle and trailer are simultaneously braking, the exhaust pipe of the main vehicle and the coordinated control pipe of the trailer are connected.

3. The handbrake unit as described in claim 1, characterized in that, Also includes: A relay valve having a control chamber and an air supply passage and an exhaust passage that can be selectively connected, wherein the main vehicle air supply line is connected from the air source to the main vehicle brake chamber via the air supply passage, and the main vehicle exhaust line is connected from the main vehicle brake chamber to the exhaust port via the exhaust passage; The main vehicle air supply control pipeline connects the air source and the control chamber, and the main vehicle exhaust control pipeline connects the control chamber and the exhaust port, wherein the main vehicle air supply pipeline is connected when the main vehicle air supply control pipeline is connected, and the main vehicle exhaust pipeline is connected when the main vehicle exhaust control pipeline is connected.

4. The handbrake unit as described in claim 3, characterized in that, It also includes a first control valve for the main vehicle and a second control valve for the main vehicle, which have a third channel and a fourth channel that can be selectively connected. The main vehicle air supply control pipeline is connected to the control chamber from the air source via the third channel and the second control valve for the main vehicle. The main vehicle exhaust control pipeline is connected to the exhaust port from the control chamber via the second control valve for the main vehicle and the fourth channel.

5. The handbrake unit as described in claim 1, characterized in that, Also includes: The first air pressure sensor is connected to the trailer cooperative control pipeline; and / or The second air pressure sensor is connected to the trailer brake chamber.

6. The handbrake unit as described in any one of claims 1-5, characterized in that, Each control valve is integrated into the manual valve body and connected to the electronic control unit; The hand valve body is also connected to the main vehicle's electronic control switch and the trailer's electronic control switch.

7. An electronic braking control system, characterized in that, It is equipped with a handbrake unit as described in any one of claims 1-6.

8. A control method for a handbrake unit, characterized in that, For controlling the handbrake unit as described in any one of claims 1-6, comprising: In response to the trailer's independent braking demand signal, the main vehicle's air supply line is turned on, and the second channel and the trailer's second control valve are connected to turn on the trailer's exhaust line, so that the main vehicle can drive normally while the trailer brakes independently. In response to the trailer brake release demand signal, the main vehicle air supply line is opened, the trailer second control valve is closed, and the second channel and the trailer third control valve are connected to open the trailer air supply line; In response to a trailer inspection request signal, the exhaust pipe of the main vehicle is opened, the second control valve of the trailer is closed, and the third control valve of the trailer and the second channel are connected to open the air supply pipe of the trailer.

9. The control method as described in claim 8, characterized in that, Also includes: In response to the signal indicating that the main vehicle and trailer are to travel simultaneously, the main vehicle's air supply line is activated, and the first channel is connected to activate the trailer's collaborative control line. In response to a signal indicating simultaneous braking demand from both the main vehicle and the trailer, the exhaust pipe of the main vehicle is activated, and the first channel is connected to activate the trailer coordination control pipe.

10. An electronic device, characterized in that, Used to implement the control method as described in claim 8 or 9.

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