An EPB valve assembly

Abstract

The application relates to the field of EPB (electronic parking brake) and discloses an EPB valve assembly, which comprises an electronic control unit (1), a main air inlet (2), a main air outlet and an electromagnetic valve group; the electromagnetic valve group comprises a second electromagnetic valve (6) with two positions and two normally closed states and a third electromagnetic valve (7) with two positions and two normally closed states; or the electromagnetic valve group comprises a first electromagnetic valve (5) with two positions and two normally closed states, a second electromagnetic valve (6) with two positions and two normally closed states, a third electromagnetic valve (7) with two positions and two normally closed states, a fourth electromagnetic valve (8) with two positions and two normally closed states; or the electromagnetic valve group comprises a first electromagnetic valve (5) with two positions and two normally closed states, a second electromagnetic valve (6) with two positions and two normally closed states, a third electromagnetic valve (7) with two positions and two normally closed states, a fourth electromagnetic valve (8) with two positions and two normally closed states and a fifth electromagnetic valve (10) with two positions and two normally open states. The air path design can meet the integration requirement, the cost is lower, and the installation is convenient.

Description

Technical Field

[0001] This invention relates to the field of EPB valve assemblies, and more particularly to an EPB valve assembly. Background Technology

[0002] The applicant previously filed a patent CN201811158783.0 – Integrated EPB Valve Assembly and EPB Electronic Parking Brake System, which features a completely redesigned valve breathing structure. However, it does not address the issue that existing parking brake systems require additional control valves and air pressure sensors outside the EPB system for trailer inspection and individual trailer braking. This arrangement suffers from drawbacks such as high cost and complex piping. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing an EPB valve assembly.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] An EPB valve assembly includes an upper valve body, a lower valve body, and an upper cover disposed on the upper end of the upper valve body. It also includes a solenoid valve assembly, which is installed in the upper valve body and connected to an electronic control unit disposed on its upper part. The electronic control unit is sealed in a cavity inside the upper valve body through the upper cover.

[0006] The upper valve body includes a lower base plate, the solenoid valve assembly is mounted on the lower base plate, a sleeve is provided around the edge of the lower base plate, and a mounting sleeve is provided at the lower edge of the sleeve, which cooperates with the mounting sleeve 2 at the upper edge of the lower valve body.

[0007] It also includes a relay valve, which is installed in the valve chamber of the lower valve body. The relay valve includes a relay piston and a valve assembly. The upper chamber of the relay piston is a control chamber. The relay piston includes a piston plate and a push rod at the lower end. The push rod acts on the valve assembly at the lower end. The middle part of the push rod is a hollow structure. The solenoid valve group includes a third solenoid valve. The third solenoid valve is connected to the exhaust port at the lower end of the lower valve body through an air pipe inserted in the push rod.

[0008] The lower valve body is provided with a main air inlet and a main air outlet, and also includes a sealing gasket. The sealing gasket is placed between mounting sleeve one and mounting sleeve two. The sealing gasket extends into the valve cavity of the lower valve body with a sealing ring. The sealing ring extends beyond the inner wall of the valve cavity and fits against the piston. The sealing gasket is provided with an air port. The solenoid valve assembly of the upper valve body and the main air inlet and main air outlet of the lower valve body are connected through the air port.

[0009] Preferably, the solenoid valve assembly includes a second solenoid valve that is normally closed in two positions and a third solenoid valve that is normally closed in two positions; or the solenoid valve assembly includes a first solenoid valve that is normally closed in two positions, a second solenoid valve that is normally closed in two positions, a third solenoid valve that is normally closed in two positions, and a fourth solenoid valve that is normally closed in two positions; or the solenoid valve assembly includes a first solenoid valve that is normally closed in two positions, a second solenoid valve that is normally closed in two positions, a third solenoid valve that is normally closed in two positions, a fourth solenoid valve that is normally closed in two positions, and a fifth solenoid valve that is normally open in two positions.

[0010] The electronic control unit is used to connect to the vehicle's computer to receive signals from the vehicle's computer and control the on / off power of each solenoid valve according to the signals;

[0011] One main air intake port is directly connected to the transition chamber of the relay valve, another is connected to the first solenoid valve, and the third is connected to the fourth solenoid valve.

[0012] The outlet air passage of the first solenoid valve is connected to the control chamber of the relay valve, and the inlet air passage of the first solenoid valve is connected to the main air inlet.

[0013] The second solenoid valve is connected to the control chamber of the relay valve, and one of the air outlet paths is connected to the exhaust port.

[0014] The intake air path of the third solenoid valve is connected to the outlet air path of the fourth solenoid valve, and the other is connected to the exhaust port.

[0015] The fourth solenoid valve outlet is used to connect to the main outlet;

[0016] The fifth solenoid valve is connected to the air outlet chamber of the relay valve and the main air outlet; one path is connected to the air outlet path of the fourth solenoid valve.

[0017] Preferably, the main air outlet includes a first air outlet and a second air outlet. The first air outlet and the main air inlet are disposed on the lower valve body. The first air outlet is connected to the air outlet chamber, and the second air outlet is connected to the fifth solenoid valve. A one-way valve is disposed inside the main air inlet. A first air passage is disposed on the side wall of the main air inlet and connected to the fourth solenoid valve. Another path of the main air inlet is connected to the transition chamber in the middle of the lower valve body. A first air passage is disposed on the side wall of the transition chamber and connected to the first solenoid valve.

[0018] Preferably, the upper chamber of the relay piston is the control chamber, the lower chamber of the relay piston is the exhaust chamber, the transition chamber is located in the exhaust chamber, and the main intake port is connected to the first solenoid valve through a fifth air passage provided on the side wall of the transition chamber. The valve assembly includes valve a and valve b, and the middle part of the valve assembly is connected to the exhaust port. Valve a controls the connection and closure of the exhaust chamber and the exhaust port, and valve b controls the connection and closure of the transition chamber and the exhaust chamber. When the vehicle is in the parking state, valve a is open and valve b is closed. When the vehicle is in the parking release state, valve a is closed and valve b is open.

[0019] Preferably, the outlet of the second solenoid valve is connected to the control chamber. The on / off state of the second solenoid valve controls the on / off state of the outlet and exhaust port of the second solenoid valve. The outlet of the second solenoid valve is connected to the exhaust port through the second air passage. The second air passage passes through the upper valve body and the lower valve body in sequence and is connected to the exhaust port.

[0020] Preferably, the outlet of the third solenoid valve is connected to the third air passage, which is connected to the exhaust port; the second outlet is connected to the outlet of the third solenoid valve, and the third solenoid valve controls the connection and disconnection between the outlet of the third solenoid valve and the third air passage.

[0021] Preferably, the outlet of the fourth solenoid valve is connected to the second outlet, and the fourth solenoid valve controls the connection and disconnection between the main inlet and the second outlet by switching the power on and off.

[0022] Preferably, the valve body is provided with a fourth air passage for connecting the air outlet chamber and the fifth solenoid valve. The fifth solenoid valve is connected to the second air outlet and controls the connection and disconnection between the second air outlet and the air outlet chamber.

[0023] Preferably, the air port on the upper end face of the lower valve body includes an air hole one forming a first air path, an air hole two forming a second air path, and an air hole three forming a fourth air path. A sealing gasket is provided on the inner side of the sealing gasket. The relay piston of the relay valve seals with the sealing gasket. A gap is formed between the sealing gasket and the side of the air outlet chamber. The air outlet chamber is connected to the second air outlet through the gap, the air hole three, and the fourth air path.

[0024] As a preferred embodiment, the upper valve body is also equipped with pressure sensor one and pressure sensor two. Pressure sensor one is connected to the second air outlet, and pressure sensor two is connected to the fourth air passage.

[0025] Because the present invention adopts the above technical solution, it has the following significant technical effects:

[0026] This invention designs an EPB valve assembly. This solution uses an integrated approach to solve the problem of separate structure layout, reducing costs. Based on existing technology, it adds a separate parking brake function for trailer inspection and control. Furthermore, for vehicle models other than tractor units, different control methods can be achieved through different solenoid valve combinations. The valve body structure is also designed to allow for air circuit connection between the upper and lower valve bodies. The upper valve body can be designed with solenoid valve assemblies as needed, making this solution adaptable to vehicles with different requirements. Attached Figure Description

[0027] Figure 1 This is the front view of the device.

[0028] Figure 2 yes Figure 1 A cross-sectional view from the perspective of AA.

[0029] Figure 3 yes Figure 1 The left view.

[0030] Figure 4 yes Figure 3 Cross-sectional view from KK perspective.

[0031] Figure 5 yes Figure 1 The right view.

[0032] Figure 6 yes Figure 5 Cross-sectional view from a CC perspective.

[0033] Figure 7 yes Figure 1 Top view.

[0034] Figure 8 yes Figure 7 A cross-sectional view from the TT perspective.

[0035] Figure 9 yes Figure 7 A cross-sectional view from the perspective of NN.

[0036] Figure 10 yes Figure 7 A cross-sectional view from an LL perspective.

[0037] Figure 11 This is a structural diagram of the upper valve body and the lower valve body.

[0038] Figure 12 This is a schematic diagram of the valve body.

[0039] The technical names of the reference numerals in the figure are as follows: 1—Electronic control unit, 2—Main air inlet, 3—First air outlet, 4—Second air outlet, 5—First solenoid valve, 6—Second solenoid valve, 7—Third solenoid valve, 8—Fourth solenoid valve, 10—Fifth solenoid valve, 11—Transition chamber, 12—Control chamber, 13—Relay valve, 14—Exhaust port, 15—Upper valve body, 16—Lower valve body, 17—Upper cover, 19—First air passage, 20—Second solenoid valve... 21—Second air passage, 22—Fourth air passage, 23—Valve a, 24—Valve b, 25—Relay piston, 26—Air hole three, 27—Gap, 28—Pressure sensor one, 29—Pressure sensor two, 30—Sealing gasket, 31—Sealing lip, 32—Air outlet chamber, 33—Fifth air passage, 34—Lower base plate, 35—Sleeve one, 36—Mounting sleeve one, 37—Mounting sleeve two, 38—Piston leaf, 39—Push column. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] An EPB valve assembly includes an upper valve body 15, a lower valve body 16, and an upper cover 17 disposed on the upper end of the upper valve body 15. It also includes a solenoid valve assembly, which is installed in the upper valve body and connected to an electronic control unit 1 disposed on its upper part. The electronic control unit 1 is sealed and installed in a cavity inside the upper valve body 15 through the upper cover 17.

[0043] The upper valve body 15 includes a lower base plate 34. The solenoid valve assembly is mounted on the lower base plate 34. A sleeve 35 is provided around the edge of the lower base plate 34. A mounting sleeve 36 is provided at the lower end of the sleeve 35. The mounting sleeve 36 cooperates with the mounting sleeve 37 at the upper end of the lower valve body 16.

[0044] It also includes a relay valve 13, which is installed in the valve chamber of the lower valve body 16. The relay valve 13 includes a relay piston 25 and a valve assembly. The upper chamber of the relay piston 25 is the control chamber 12. The relay piston 25 includes a piston leaf 38 and a push rod 39 at the lower end. The push rod 39 acts on the valve assembly at the lower end. The middle part of the push rod 39 is a hollow structure. The solenoid valve group includes a third solenoid valve 7. The third solenoid valve 7 is connected to the exhaust port 14 at the lower end of the lower valve body through an air pipe inserted in the push rod.

[0045] The lower valve body 16 is provided with a main air inlet 2 and a main air outlet, and also includes a sealing gasket 30. The sealing gasket 30 is disposed between the mounting sleeve 1 36 and the mounting sleeve 2 37. The sealing gasket 30 extends into the valve cavity of the lower valve body 16 with a sealing lip 31. The sealing lip 31 extends beyond the inner wall of the valve cavity and fits against the piston leaf 38. The sealing gasket 30 is provided with an air port. The solenoid valve assembly of the upper valve body 15 and the main air inlet 2 and the main air outlet of the lower valve body 16 are connected through the air port.

[0046] The solenoid valve assembly includes a second solenoid valve 6 in two normally closed positions and a third solenoid valve 7 in two normally closed positions; or the solenoid valve assembly includes a first solenoid valve 5 in two normally closed positions, a second solenoid valve 6 in two normally closed positions, a third solenoid valve 7 in two normally closed positions, and a fourth solenoid valve 8 in two normally closed positions; or the solenoid valve assembly includes a first solenoid valve 5 in two normally closed positions, a second solenoid valve 6 in two normally closed positions, a third solenoid valve 7 in two normally closed positions, a fourth solenoid valve 8 in two normally closed positions, and a fifth solenoid valve 10 in two normally open positions.

[0047] The electronic control unit 1 is used to connect with the vehicle computer to receive signals from the vehicle computer and control the on / off power of each solenoid valve according to the signals;

[0048] One main air inlet 2 is directly connected to the transition chamber 11 of the relay valve 13, another is connected to the first solenoid valve 5, and the third is connected to the fourth solenoid valve 8.

[0049] The outlet air passage of the first solenoid valve 5 is connected to the control chamber 12 of the relay valve 13, and the inlet air passage of the first solenoid valve 5 is connected to the main air inlet 2.

[0050] The second solenoid valve 6 is connected to the control chamber 12 of the relay valve 13, and one of the air outlet paths is connected to the exhaust port 14.

[0051] One of the air intake paths of the third solenoid valve 7 is connected to the air outlet path of the fourth solenoid valve 8, and the other is connected to the exhaust port 14.

[0052] The outlet of the fourth solenoid valve 8 is used to connect to the main outlet;

[0053] The fifth solenoid valve 10 is connected to the air outlet chamber 32 of the relay valve 13 and the main air outlet; one path is connected to the air outlet path of the fourth solenoid valve 8.

[0054] Different solenoid valve groups can be selected to suit different scenarios. In this embodiment, the solenoid valve group includes a first solenoid valve 5 with two normally closed positions, a second solenoid valve 6 with two normally closed positions, a third solenoid valve 7 with two normally closed positions, a fourth solenoid valve 8 with two normally closed positions, and a fifth solenoid valve 10 with two normally open positions. The design of the above five solenoid valves can not only realize the functions of parking, hill start assist automatic release, emergency braking, automatic parking, and drive anti-skid assist, but also realize trailer inspection and trailer individual braking. It has a high degree of integration and is easy to install.

[0055] In this embodiment, the valve assembly includes an upper valve body 15, a lower valve body 16, and an upper cover 17 disposed on the upper end of the upper valve body 15. A first solenoid valve 5, a second solenoid valve 6, a third solenoid valve 7, a fourth solenoid valve 8, and a fifth solenoid valve 10 are disposed within the upper valve body 15 and connected to an electronic control unit 1 disposed on its upper part. The electronic control unit 1 is sealed and installed within a cavity of the upper valve body 15 through the upper cover 17. The electronic control unit 1 controls each solenoid valve according to received control signals. In this embodiment, the electronic control unit 1 is an integrated control circuit board.

[0056] In this design, the main air outlet includes a first air outlet 3 and a second air outlet 4. The first air outlet 3 is used for routine parking brake operations, and the second air outlet 4 is used to connect to the trailer valve. The first air outlet 3 and the main air inlet 2 are located on the lower valve body 16. The first air outlet 3 is connected to the air outlet chamber 32, and the second air outlet 4 is connected to the fifth solenoid valve 10. Since the fifth solenoid valve 10 is normally open, the first air outlet 3 and the second air outlet 4 are normally connected. A one-way valve is installed inside the main air inlet 2. A first air passage 19 is provided on the side wall of the main air inlet 2, connecting to the fourth solenoid valve 8. Another path from the main air inlet 2 is connected to the transition chamber 11 in the middle of the lower valve body 16. The side wall of the transition chamber 11 is provided with a first air passage 19, connecting to the first solenoid valve 5. In this scheme, the fourth solenoid valve 8 is connected to the second air outlet 4. Therefore, when the fifth solenoid valve 10 is energized, the main air inlet 2 of the fourth solenoid valve 8 can be connected to the second air outlet 4 separately to achieve individual control of the trailer.

[0057] Obviously, this structure also requires the use of a relay valve 13. The relay valve 13 is installed in the lower valve body 16. The relay valve 13 includes a relay piston 25 and a valve assembly. The upper chamber of the relay piston 25 is the control chamber 12, and the lower chamber of the relay piston 25 is the exhaust chamber 32. The transition chamber 11 is set in the exhaust chamber 32. The main air inlet 2 is connected to the first solenoid valve 5 through a fifth air passage 33 set on the side wall of the transition chamber 11. The valve assembly includes valve a23 and valve b24. The middle part of the valve assembly is connected to the exhaust port 14. Valve a23 controls the connection and closure of the exhaust chamber 32 and the exhaust port 14, and valve b24 controls the connection and closure of the transition chamber 11 and the exhaust chamber 32. When the vehicle is parked, valve a23 is open and valve b24 is closed. When the vehicle is released from parking, valve a23 is closed and valve b24 is open. Valve a23 and valve b24 can only be one open and one closed at a time, thereby realizing the alternating action of parking and exhaust.

[0058] The outlet of the second solenoid valve 6 is connected to the control chamber 12. The opening and closing of the second solenoid valve 6 controls the opening and closing of the outlet of the second solenoid valve 6 and the exhaust port 14. The outlet of the second solenoid valve 6 is connected to the exhaust port 14 through the second air passage 20. The second air passage 20 passes through the upper valve body 15 and the lower valve body 16 in sequence and is connected to the exhaust port 14.

[0059] In this design, the outlet of the third solenoid valve 7 is connected to the third air passage 21, which in turn connects to the exhaust port 14. The second outlet 4 is connected to the outlet of the third solenoid valve 7, and the third solenoid valve 7 controls the connection and disconnection between its outlet and the third air passage 21. The outlet of the fourth solenoid valve 8 is connected to the second outlet 4, and the fourth solenoid valve 8 controls the connection and disconnection between the main air inlet 2 and the second outlet 4 by switching it on and off. In this embodiment, the first solenoid valve 5, the second solenoid valve 6, the fourth solenoid valve 8, and the fifth solenoid valve 10 are positioned at the four corners of a rectangle, while the third solenoid valve 7 is positioned at the center of the rectangle. This structural design facilitates the channel design of the surrounding solenoid valves, enabling compressed air to be discharged from the exhaust port 14 through the third air passage 21 connected to the third solenoid valve 7.

[0060] The valve body is equipped with a fourth air passage 22 for connecting the air outlet chamber 32 and the fifth solenoid valve 10. The fifth solenoid valve 10 is connected to the second air outlet 4 and controls the connection and disconnection between the second air outlet 4 and the air outlet chamber 32. The design of the fourth air passage 22 is to enable the first air outlet 3 and the second air outlet 4 to be connected under normal circumstances, and to disconnect the first air outlet 3 and the second air outlet 4 when separate control is required. Since there are two paths for the air inlet, in this case, the air inlet can directly deliver compressed air to the second air outlet 4 through the fourth solenoid valve 8.

[0061] To facilitate understanding of how the second air outlet 4 of the upper valve body 15 connects to the first air outlet 3 of the lower valve body 16, the following explanation is provided:

[0062] The upper end face of the lower valve body 16 has an air hole 1 forming the first air passage 19, an air hole 2 forming the second air passage 20, and an air hole 36 forming the fourth air passage 22. A sealing gasket 31 extends from the inner side of the sealing gasket 30. The relay piston 25 of the relay valve 13 seals with the sealing gasket 31. A gap 27 is formed between the sealing gasket 31 and the side of the air outlet chamber 32. The air outlet chamber 32 is connected to the second air outlet 4 through the gap 27, the air hole 36, and the fourth air passage 22. In this design, not only is conventional sealing achieved, but the potential impact of the vertical movement of the relay piston 25 on the third air passage 21 is also eliminated. In this case, one end of the third air passage 21 is always connected to the air outlet chamber 32. For the first air passage 19 and the second air passage 20, it is obvious that the sealing gasket 30 has air holes for connecting the upper valve body 15 and the lower valve body 16.

[0063] In this scheme, pressure sensor 128 and pressure sensor 29 are also installed inside the upper valve body 15. Pressure sensor 128 is connected to the second air outlet 4, and pressure sensor 29 is connected to the fourth air passage 22.

[0064] The working scenario of this valve assembly structure is as follows:

[0065] Function 1: Principle of service brake release for light trucks, medium and heavy trucks, and buses

[0066] When the electronic control unit 1 receives a signal requiring vehicle braking, it drives the first solenoid valve 5, causing compressed air from the air source to pass through the main air inlet 2 and the first solenoid valve 5 into the control chamber 12 of the relay valve 13. The relay piston 25 then opens valve b24 and closes valve a23, allowing air from the air inlet 1 to chamber A to communicate with air in chamber B. Air from chamber B flows directly to the first air outlet 3, reaching the parking chamber of the spring brake chamber to release the brake.

[0067] The parking brake principle of light trucks, medium and heavy trucks and buses: The electronic control unit 1 drives the second solenoid valve 6, so that the compressed air in the control chamber 12 is discharged from the exhaust port 14 through the second air passage 20 through the outlet of the second solenoid valve 6; thereby closing the valves of the main air inlet 2 and the first air outlet 3; and opening the third solenoid valve 7, so that the compressed air in the spring brake chamber is discharged from the exhaust port 14 through the first air outlet 3, the exhaust chamber 32 and the valve a23 of the valve assembly, and the compressed air in the second air outlet 4 is discharged through the third solenoid valve 7 and the third air passage 21, thereby realizing vehicle parking.

[0068] Function 2:

[0069] An electronic parking system suitable for heavy-duty commercial vehicles that does not require a separate trailer braking function and has trailer parking capability detection capabilities. It includes an electronic control unit 1 and a mechanical structure. The mechanical structure receives control signals from the electronic control unit 1 to drive the vehicle to apply the parking brake and release the parking brake.

[0070] Working principle: When the tractor is parked, there is no compressed air at the first air outlet 3 and the second air outlet 4. At this time, the fourth solenoid valve 8 is opened, allowing the air from the main air inlet 2 to enter the second air outlet 4, reaching the parking chamber of the trailer spring brake chamber to release the parking. Then, the fourth solenoid valve 8 is disconnected, cutting off the air supply to the main air inlet 2, and the third solenoid valve 7 is opened, allowing the compressed air in the spring brake chamber and the second air outlet 4 to be exhausted through the third solenoid valve 7, thus releasing the parking.

[0071] Function 3:

[0072] An electronic parking system suitable for medium and heavy-duty commercial vehicles needs to have both trailer stopping and breaking capacity detection functions and trailer individual braking functions.

[0073] Working principle: When the electronic control unit 1 receives the parking brake signal, the electronic control unit 1 drives the first solenoid valve 5, so that the compressed air from the air source passes through the main air inlet 2, the transition chamber 11, and the first solenoid valve 5 to the control chamber 12 of the relay valve 13, opening the valve of the relay valve 13, so that the transition chamber 11 and the air outlet 32 ​​are connected, thereby connecting the main air inlet 2 with the first air inlet, and reaching the parking chamber of the spring brake chamber through the first air outlet 3 to realize the parking release; at the same time, the compressed air from the first air outlet 3 will also reach the second air outlet 4 connected to the trailer control port through the fifth solenoid valve 10 to realize the trailer brake release.

[0074] When the vehicle requires parking brake operation, the electronic control unit 1 drives the second solenoid valve 6, causing compressed air from the outlet chamber 32 to exit through the second air passage 20 and then from the exhaust port 14. This closes the valves of the main air inlet 2 and the first air outlet 3, allowing compressed air from the spring brake chamber to exit through the first air outlet 3 and then from the exhaust port 14, thus parking the vehicle. Simultaneously, the pressure at the second air outlet 4 of the trailer brake port is discharged through the third solenoid valve 7 from the exhaust port 14, thus parking the trailer. When trailer deceleration control is required, the electronic control unit 1 receives a signal from the parking switch and energizes the fifth solenoid valve 10, cutting off the air supply between the first air outlet 3 and the second air outlet 4. By controlling the energization of the fourth solenoid valve 8 and the third solenoid valve 7, the pressure at the second air outlet 4 is increased or decreased, thereby controlling the deceleration of the trailer.

[0075] This invention designs an EPB valve assembly. This solution adopts an integrated approach to solve the problem of separate structure layout, reducing costs. Based on the existing technology, it adds a separate parking brake function for trailer inspection and control. In addition, for vehicle models other than tractor units, different control can be achieved through different combinations of solenoid valves.

[0076] Example 2

[0077] The difference from Example 1 is that, for vehicle models other than tractors, parking and release can be controlled by the second solenoid valve 6 and the third solenoid valve 7, without the need to install other solenoid valves and pressure sensors.

[0078] Example 3

[0079] The difference from Embodiment 1 is that when only the trailer inspection function needs to be met, the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7 and the fourth solenoid valve 8 can be used to achieve this function, and there is no need to install the fifth solenoid valve 10.

Claims

1. An EPB valve assembly, characterized in that: It includes an upper valve body (15), a lower valve body (16) and an upper cover (17) disposed on the upper end of the upper valve body (15), and also includes a solenoid valve assembly, which is installed in the upper valve body and connected to an electronic control unit (1) disposed on its upper part. The electronic control unit (1) is sealed in the cavity inside the upper valve body (15) through the upper cover (17). The upper valve body (15) includes a lower base plate (34), the solenoid valve assembly is installed on the lower base plate (34), a sleeve (35) is provided around the edge of the lower base plate (34), and a mounting sleeve (36) is provided at the lower end of the sleeve (35), and the mounting sleeve (36) cooperates with the mounting sleeve (37) at the upper end of the lower valve body (16). It also includes a relay valve (13), which is installed in the valve chamber of the lower valve body (16). The relay valve (13) includes a relay piston (25) and a valve assembly. The upper chamber of the relay piston (25) is the control chamber (12). The relay piston (25) includes a piston plate (38) and a push rod (39) at the lower end. The push rod (39) acts on the valve assembly at the lower end. The middle part of the push rod (39) is a hollow structure. The solenoid valve group includes a third solenoid valve (7). The third solenoid valve (7) is connected to the exhaust port (14) at the lower end of the lower valve body through an air pipe inserted in the push rod. The lower valve body is provided with a main air inlet (2) and a main air outlet, and also includes a sealing gasket (30). The sealing gasket (30) is located between the first mounting sleeve (36) and the second mounting sleeve (37). The sealing gasket (30) extends into the valve cavity of the lower valve body with a sealing lip (31). The sealing lip (31) extends beyond the inner wall of the valve cavity and fits against the piston blade (38). The sealing gasket (30) is provided with an air port. The solenoid valve group of the upper valve body (15) and the main air inlet and main air outlet of the lower valve body are connected through the air port. The solenoid valve assembly includes a first solenoid valve (5) with two normally closed positions, a second solenoid valve (6) with two normally closed positions, a third solenoid valve (7) with two normally closed positions, and a fourth solenoid valve (8) with two normally closed positions; or the solenoid valve assembly includes a first solenoid valve (5) with two normally closed positions, a second solenoid valve (6) with two normally closed positions, a third solenoid valve (7) with two normally closed positions, a fourth solenoid valve (8) with two normally closed positions, and a fifth solenoid valve (10) with two normally open positions. The electronic control unit (1) is used to connect with the vehicle computer to receive signals from the vehicle computer and control the on / off power of each solenoid valve according to the signals; One of the main air inlet (2) is directly connected to the transition chamber (11) of the relay valve (13), another is connected to the first solenoid valve (5), and the third is connected to the fourth solenoid valve (8). The outlet air path of the first solenoid valve (5) is connected to the control chamber (12) of the relay valve (13), and the inlet air path of the first solenoid valve (5) is connected to the main air inlet (2). The second solenoid valve (6) is connected to the control chamber (12) of the relay valve (13), and one of the air outlet paths is connected to the exhaust port (14); One of the air intake paths of the third solenoid valve (7) is connected to the air outlet path of the fourth solenoid valve (8), and the other is connected to the exhaust port (14). The outlet of the fourth solenoid valve (8) is used to connect with the main outlet; The fifth solenoid valve (10) is connected to the air outlet chamber (32) and main air outlet of the relay valve (13); one path is connected to the air outlet path of the fourth solenoid valve (8).

2. An EPB valve assembly according to claim 1, characterized in that: The main air outlet includes a first air outlet (3) and a second air outlet (4). The first air outlet (3) and the main air inlet (2) are located on the lower valve body (16). The first air outlet (3) is connected to the air outlet chamber (32), and the second air outlet (4) is connected to the fifth solenoid valve (10). A one-way valve is provided in the main air inlet (2). The side wall of the main air inlet (2) is provided with a first air passage (19) connected to the fourth solenoid valve (8). The other path of the main air inlet (2) is connected to the transition chamber (11) in the middle of the lower valve body (16). The side wall of the transition chamber (11) is provided with a first air passage (19) connected to the first solenoid valve (5).

3. An EPB valve assembly according to claim 2, characterized in that: The upper chamber of the relay piston (25) is the control chamber (12), and the lower chamber of the relay piston (25) is the exhaust chamber (32). The transition chamber (11) is located in the exhaust chamber (32). The main air inlet (2) is connected to the first solenoid valve (5) through a fifth air passage (33) set on the side wall of the transition chamber (11). The valve assembly includes valve a (23) and valve b (24). The middle part of the valve assembly is connected to the exhaust port (14). Valve a (23) controls the connection and closure of the exhaust chamber (32) and the exhaust port (14). Valve b (24) controls the connection and closure of the transition chamber (11) and the exhaust chamber (32). When the vehicle is in the parking state, valve a (23) is open and valve b (24) is closed. When the vehicle is in the parking release state, valve a (23) is closed and valve b (24) is open.

4. An EPB valve assembly according to claim 3, characterized in that: The outlet of the second solenoid valve (6) is connected to the control chamber (12). The on / off state of the second solenoid valve (6) controls the on / off state of the outlet of the second solenoid valve (6) and the exhaust port (14). The outlet of the second solenoid valve (6) is connected to the exhaust port (14) through the second air passage (20). The second air passage (20) passes through the upper valve body (15) and the lower valve body (16) in sequence and is connected to the exhaust port (14).

5. An EPB valve assembly according to claim 2, characterized in that: The outlet of the third solenoid valve (7) is connected to the third air passage (21), and the third air passage (21) is connected to the exhaust port (14); the second outlet (4) is connected to the outlet of the third solenoid valve (7), and the third solenoid valve (7) controls the opening and closing of the outlet of the third solenoid valve (7) and the third air passage (21).

6. An EPB valve assembly according to claim 2, characterized in that: The outlet of the fourth solenoid valve (8) is connected to the second outlet (4). The fourth solenoid valve (8) controls the connection and disconnection between the main inlet (2) and the second outlet (4) by switching the power on and off.

7. An EPB valve assembly according to claim 2, characterized in that: The valve body is provided with a fourth air passage (22) for connecting the air outlet chamber (32) and the fifth solenoid valve (10). The fifth solenoid valve (10) is connected to the second air outlet (4) and controls the connection and disconnection between the second air outlet (4) and the air outlet chamber (32).

8. An EPB valve assembly according to claim 2, characterized in that: The air port on the upper end face of the lower valve body (16) includes an air hole one forming the first air passage (19), an air hole two forming the second air passage (20), and an air hole three (26) forming the fourth air passage (22). A sealing lip (31) is provided on the inner side of the sealing gasket (30). The relay piston (25) of the relay valve (13) seals with the sealing lip (31). A gap (27) is formed between the sealing lip (31) and the side of the air outlet chamber (32). The air outlet chamber (32) is connected to the second air outlet (4) through the gap (27), the air hole three (26), and the fourth air passage (22).

9. An EPB valve assembly according to claim 2, characterized in that: The upper valve body (15) is also equipped with pressure sensor one (28) and pressure sensor two (29). Pressure sensor one (28) is connected to the second air outlet (4), and pressure sensor two (29) is connected to the fourth air passage (22).

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