Commercial vehicle electronic parking system with mechanical redundancy control mechanism and EPB valve assembly

Abstract

The utility model relates to the field of intelligent parking of commercial vehicles, and discloses a commercial vehicle electronic parking system with a mechanical redundancy control mechanism and an EPB valve assembly, a control cavity of a pneumatic control valve is externally connected with a two-position two-way valve, a control air port of the two-position two-way valve is externally connected with a manual control knob valve, an air inlet end of the manual control knob valve is connected with an air inlet, and an air outlet end of the manual control knob valve is connected with an air outlet. One path of the air outlet end of the manual control knob valve is connected to the control air port, the other path of the air outlet end of the manual control knob valve is connected to the second bi-pass one-way valve, the air outlet end of the second bi-pass one-way valve is connected to the first bi-pass one-way valve, and the other air inlet of the second bi-pass one-way valve is connected to the foot valve air pressure outlet. The valve system has the advantages of fewer parts, convenience in control, no damage to the electromagnetic valve and the like.

Description

Technical Field

[0001] The utility model relates to the field of electronic parking for commercial vehicles, in particular to an electronic parking system for commercial vehicles with a mechanical redundancy control mechanism and an EPB valve assembly. Background Art

[0002] On November 22, 2019, the applicant applied for Chinese patent CN201922044252.5 - Commercial vehicle intelligent parking EPB valve system, EPB valve assembly. The epb valve is structurally designed to enable the epb valve to realize functions such as conventional parking, parking switching and driving, and the epb valve system eliminates the need for a manual valve, pipes connected to the cab, and a quick-release valve for parking. It has the advantages of low cost, easy assembly, saving manpower and material costs, and easier maintenance. In addition, the valve system has the advantages of reliable control, high safety, and long service life of the solenoid valve. At the same time, the epb valve system can not only realize parking braking, brake release, and anti-superposition actions, but also cooperate with other components of the parking system to realize ramp assist, emergency braking, automatic parking, and drive anti-skid assist functions.

[0003] However, the applicant discovered during subsequent research and development that the EPB valve system lacked mechanical redundancy, and when the valve system failed, the parking brake was difficult to release and open. Utility Model Content

[0004] The utility model aims at the shortcomings of the prior art and provides a commercial vehicle electronic parking system and an EPB valve assembly with a mechanical redundancy control mechanism.

[0005] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] An electronic parking system for commercial vehicles with a mechanical redundant control mechanism includes an electronic control unit, a normally closed first solenoid valve and a second solenoid valve, and a normally open third solenoid valve, and also includes a pneumatic control valve, a relay valve, and a two-way check valve. The EPB valve also includes an air inlet for air pressure to enter, and a check valve is provided at the air inlet;

[0007] The air path of the air inlet includes three paths, one of which is directly connected to the valve cavity of the relay valve; one of which is connected to the first solenoid valve; and another of which is connected to the pneumatic control valve;

[0008] The first solenoid valve is electrically connected to the electronic control unit, the air inlet path of the first solenoid valve is connected to the air inlet, and the air outlet path is divided into two paths, one path is connected to the control chamber of the pneumatic control valve, and the other path is connected to the two-way one-way valve;

[0009] The control chamber of the pneumatic control valve is connected to the first solenoid valve and the second solenoid valve; the air outlet path of the pneumatic control valve includes an air path connected to the third solenoid valve;

[0010] The third solenoid valve is electrically connected to the electronic control unit, and the gas outlet path of the third solenoid valve includes a gas path connected to the two-way one-way valve;

[0011] A two-position two-way valve is connected to the control chamber of the pneumatic control valve, and a manual knob valve is connected to the control air port of the two-position two-way valve. The air inlet end of the manual knob valve is connected to the air inlet, and the air outlet end of the manual knob valve is connected to the control air port in one way and to the second two-way one-way valve in the other way. The air outlet end of the second two-way one-way valve is connected to the first two-way one-way valve, and the other air inlet of the second two-way one-way valve is connected to the air pressure outlet of the foot valve.

[0012] Preferably, the manual knob valve is arranged in the cab.

[0013] Preferably, the second solenoid valve is electrically connected to the electronic control unit, and the outlet gas path of the second solenoid valve is connected to the exhaust port; the two-way one-way valve is connected to the upper chamber of the relay valve, the outlet port for connecting the parking is connected to the relay valve, and the exhaust port is connected to the relay valve.

[0014] Preferably, the air outlet path of the pneumatic control valve further includes an air path connected to the exhaust port.

[0015] Preferably, the first solenoid valve and the second solenoid valve are two-position, two-way normally closed solenoid valves, and the third solenoid valve is a two-position, two-way normally open solenoid valve; and the pneumatic control valve is a two-position, three-way pneumatic control valve.

[0016] Preferably, it further includes an air pressure sensor, which is connected to the air outlet for detecting the air pressure of the air outlet, the air pressure sensor is electrically connected to the electronic control unit, and the air outlet is used to be connected to the parking cavity.

[0017] Preferably, the device further comprises a backup air port for connecting to a trailer parking brake module.

[0018] The EPB valve assembly integrates the above-mentioned commercial vehicle electronic parking system with a mechanical redundant control mechanism.

[0019] The utility model adopts the above technical solution, and has the following significant technical effects:

[0020] The utility model improves the existing technical solution and adds a redundant function to the original technical solution, so that it can realize both parking and releasing operations. It can be conveniently arranged inside the cab to facilitate the driver's operation without the need to drill under the vehicle to operate. In fact, due to the low chassis of the bus, it is difficult to touch the EPB valve module, so it is almost impossible to park or release the failed EPB through external means. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a functional diagram of the parking state of a commercial vehicle electronic parking system with a mechanical redundant control mechanism. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, the commercial vehicle electronic parking system with a mechanical redundant control mechanism includes an electronic control unit 1, a normally closed first solenoid valve 2 and a second solenoid valve 3, and a normally open third solenoid valve 4, and also includes a pneumatic control valve 5, a relay valve 6 and a two-way check valve 7. The EPB valve also includes an air inlet 8 for the air source pressure to enter, and a check valve 9 is arranged at the air inlet 8; wherein the electronic control unit 1 is used to receive signals to control each solenoid valve of the EPB valve, so as to realize the corresponding function.

[0025] The air inlet 8 is connected to the air source cylinder, and the air path of the air inlet 8 includes three paths, one of which is directly connected to the valve cavity of the relay valve 6; one is connected to the first solenoid valve 2; and another is connected to the pneumatic control valve 5;

[0026] The first solenoid valve 2 is electrically connected to the electronic control unit 1, the air inlet path of the first solenoid valve 2 is connected to the air inlet 8, and the air outlet path is divided into two paths, one path is connected to the control chamber of the pneumatic control valve 5, and the other path is connected to the two-way check valve 7;

[0027] The control chamber of the pneumatic control valve 5 is connected to the first solenoid valve 2 and the second solenoid valve 3; the air outlet path of the pneumatic control valve 5 includes an air path connected to the third solenoid valve 4;

[0028] The third solenoid valve 4 is electrically connected to the electronic control unit 1 , and the gas outlet path of the third solenoid valve 4 includes a gas path connected to the two-way one-way valve 7 ;

[0029] The control chamber of the pneumatic control valve 5 is externally connected to a two-position two-way valve 23, and the control air port 43 of the two-position two-way valve 23 is externally connected to a manual knob valve 31, the air inlet end of the manual knob valve 31 is connected to the air inlet 8, and the air outlet end of the manual knob valve 31 is connected to the control air port 43 in one way and to the second two-way one-way valve 32 in the other way, the air outlet end of the second two-way one-way valve 32 is connected to the first two-way one-way valve 7, and the other air inlet of the second two-way one-way valve 32 is connected to the foot valve air pressure outlet 33.

[0030] The second solenoid valve 3 is electrically connected to the electronic control unit 1 , and the air outlet of the second solenoid valve 3 is connected to the exhaust port 11 ; wherein the exhaust port 11 is connected to the outside atmosphere.

[0031] The control port 10 is connected to the two-way check valve 7, the two-way check valve 7 is connected to the upper chamber of the relay valve 6, and the EPB valve also includes an air outlet 12, the air outlet 12 is connected to the relay valve 6, and the exhaust port 11 is connected to the relay valve 6. The air outlet 12 is used to connect to the parking chamber of the spring brake cylinder, so as to input the air pressure of the air source into the parking chamber or discharge the compressed air in the parking chamber to the atmosphere.

[0032] In this embodiment, the first solenoid valve 2 and the second solenoid valve 3 are two-position two-way normally closed solenoid valves, and the third solenoid valve 4 is a two-position two-way normally open solenoid valve; the pneumatic control valve 5 is a two-position three-way pneumatic control valve 5 or a two-position two-way pneumatic control valve 5. The commercial vehicle electronic parking system with a mechanical redundant control mechanism also includes an air pressure sensor 13, which is connected to the air outlet 12 for detecting the air pressure of the air outlet 12, and the air pressure sensor 13 is electrically connected to the electronic control unit 1, and the air outlet 12 is used to connect to the parking chamber of the spring brake cylinder.

[0033] When the vehicle changes from the driving state to the parking state, the first solenoid valve 2 is not energized, and the second solenoid valve 3 and the third solenoid valve 4 are energized. At this time, the first solenoid valve 2 is in the disconnected state, the second solenoid valve 3 is in the open state, and the third solenoid valve 4 is in the open state; the air pressure at the air inlet 8 enters the relay valve 6 chamber, and the compressed air in the relay valve 6 chamber is discharged from the second solenoid valve 3 to the exhaust port 11, the relay piston returns, and the air outlet 12 is connected to the exhaust port 11; the compressed air in the parking chamber of the spring brake cylinder is discharged from the exhaust port 11 through the air outlet 12. Specifically, the compressed air in the control chamber of the relay valve 6 flows into the second solenoid valve 3 through the two-way check valve 7, and the pressure flowing out of the second solenoid valve 3 The compressed air is discharged into the atmosphere from the exhaust port 11 through the air path. At this time, the relay piston is pushed to the initial position, and the exhaust port 11 is connected to the relay valve 6 by an air path. When the relay piston returns to the initial position, the air outlet 12 is connected to the exhaust port 11 through the air path on the relay valve 6, so that the compressed air in the parking chamber of the spring brake cylinder is discharged into the atmosphere, thereby achieving the purpose of braking; at the same time, the compressed air in the control chamber of the pneumatic control valve 5 is also discharged into the atmosphere from the second solenoid valve 3 and the exhaust port 11, and the pneumatic control valve 5 returns to its position. The power-on time of the third solenoid valve 4 depends on the time for the gas in the control chamber of the relay valve 6 chamber to be discharged. This process is generally short and will not cause damage to the solenoid valve.

[0034] When the vehicle needs to switch from the parking state to the driving state, the first solenoid valve 2 and the third solenoid valve 4 are energized, and the second solenoid valve 3 is not energized. At this time, the first solenoid valve 2 is in the open state, the second solenoid valve 3 is in the closed state, and the third solenoid valve 4 is in the closed state; the air source pressure enters the relay valve 6 from the air inlet 8; one way passes through the first solenoid valve 2; the compressed air through the first solenoid valve 2 enters the upper chamber of the relay valve 6 one way, and enters the control chamber of the pneumatic control valve 5 to open the pneumatic control valve 5, so at this time, the air of the air source can flow directly through the pneumatic control valve 5 from the air inlet 8, and then the first solenoid valve 2 is de-energized first, and then the second solenoid valve 3 is de-energized, and the compressed air of the air source enters the upper chamber of the relay piston of the relay valve 6 through the pneumatic control valve 5 and the third solenoid valve 4 in turn to open the relay valve 6, and at this time, the compressed air of the air inlet 8 is discharged from the air outlet 12 into the parking chamber of the spring brake cylinder, and the vehicle is released from the brake. The power-on time of the first solenoid valve 2 and the second solenoid valve 3 is set by the system, and only needs to be able to open the pneumatic control valve 5, so the power-on time is extremely short. Therefore, this mode has low requirements on the working time of the solenoid valve, so the service life of the solenoid valve is longer. Because the solenoid valve will generate heat and other phenomena when working for a long time, it will damage the service life of the solenoid valve.

[0035] One of the air outlet interfaces of the pneumatic control valve 5 is connected to the exhaust port 11. When the vehicle is in the parking state, if the first solenoid valve 2 leaks or the compressed air at the air inlet 8 flows out from the first solenoid valve 2 due to other reasons, the leaked compressed air is discharged into the atmosphere directly from the control chamber of the pneumatic control valve 5 through the cavity inside the pneumatic control valve 5, thereby ensuring the safety of the EPB valve body and avoiding the situation where the parking fails due to the leakage of the first solenoid valve 2 when the vehicle is in the parking state.

[0036] The control chamber of the pneumatic control valve 5 is externally connected to a normally closed manual control valve 23. The normally closed manual control valve 23 in this embodiment is a two-position two-way normally closed manual control valve. Of course, other types of manual control valves can also be selected as long as manual control can be achieved. The manual control valve is generally used in the case of manual brake release. In this case, the manual control valve is opened, and compressed air enters the control chamber of the pneumatic control valve 5 through the manual control valve, thereby opening the valve core so that the compressed air at the air inlet 8 can enter the third solenoid valve 4 and then act on the upper chamber of the relay piston of the relay valve 6, so that the air outlet 12 and the air inlet 8 are connected, and the parking chamber is pressurized to release the brake.

[0037] In this embodiment, there is a first gas circuit connection point 21 and a second gas circuit connection point 22. The first gas circuit connection point 21 has three mutually connected passages, one passage is connected to the gas outlet end of the first solenoid valve 2, one passage is connected to the control chamber of the pneumatic control valve 5, and another passage is connected to the second gas circuit connection point 22; the second gas circuit connection point 22 has four mutually connected gas circuits, one passage is connected to the gas outlet end of the third solenoid valve 4, one passage is connected to the gas inlet end of the second solenoid valve 3, one passage is connected to the two-way one-way valve 7, and the last passage is connected to the first gas circuit connection point 21.

[0038] The redundant design part: Under normal conditions, the manual knob valve 31 allows port 43 to be vented to the atmosphere. In this state, the redundant system has no effect on the EPB electronic control function. When the EPB is in the released state and needs to be parked through the redundant system, the manual knob needs to be turned to the ventilation position to allow the compressed air at the air inlet to pass through port 43, so that the two-position two-way valve at port 43 is in the open state, thereby exhausting the EPB control chamber. At this time, since there is also air pressure at port 4, the manual knob valve needs to be returned to the initial state, and the parking function can be realized. When the EPB is in the parking state and needs to be released through the redundant system, it is only necessary to turn the manual knob valve to the ventilation state and keep it. At this time, there is always air at port 4, which can keep the EPB in the released state.

[0039] Example 2

[0040] Different from the embodiment 1, the first solenoid valve 2 and the second solenoid valve 3 in this embodiment are two-position three-way solenoid valves.

[0041] Example 3

[0042] The vehicle also includes a spare air port 22 for connecting the trailer parking brake module. The spare air port 22 is used to realize the electronic parking brake of the trailer part by using the spare air port when there is also a trailer of the commercial vehicle.

[0043] Example 4

[0044] This embodiment provides an EPB valve assembly for intelligent parking of commercial vehicles. The EPB valve assembly integrates the commercial vehicle electronic parking system with a mechanical redundant control mechanism in Embodiment 1.

[0045] Example 5

[0046] like Figure 1As shown, the control method of intelligent parking includes the control method of switching from driving state to parking state and the control method of switching from parking state to driving state described in Example 1. The control method also includes anti-overlapping control: the EPB valve also includes a control port 10, and the control port 10 is connected to the two-way check valve 7. When the brake pedal is stepped on, the air pressure of the control port 10 enters the upper chamber of the relay piston, opens the relay valve 6, and the compressed air of the air inlet 8 enters the parking chamber of the spring brake cylinder from the air outlet 12, and the vehicle releases the brake.

[0047] The control method also includes emergency brake control. The intelligent parking system includes a control switch, which is an adjustable switch. The opening of the control switch can control the pressure in the parking chamber of the spring brake cylinder. The control switch is electrically connected to the electronic control unit 1. The electronic control unit 1 obtains the opening of the control switch to calculate the pressure in the parking chamber of the spring brake cylinder at the opening, and then performs the parking action. The air pressure sensor 13 detects the air pressure of the air outlet 12 in real time and transmits it to the electronic control unit 1. The electronic control unit 1 controls whether to stop the parking brake according to the current pressure of the air outlet 12 and the pressure corresponding to the calculated control switch. The pressure value of the air outlet 12 corresponding to the opening of the control switch calculated by the electronic control unit 1 is referenced to the pressure value of the air outlet 12 in the initial state. The pressure value of the air outlet 12 in the initial state is collected and transmitted to the electronic control unit 1 by the air pressure sensor 13.

[0048] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. An electronic parking system for commercial vehicles with a mechanically redundant control mechanism, characterized in that: The EPB valve comprises an electronic control unit (1), a normally closed first solenoid valve (2) and a second solenoid valve (3), and a normally open third solenoid valve (4), and also comprises a pneumatic control valve (5), a relay valve (6), and a two-way check valve (7); the EPB valve also comprises an air inlet (8) for air source pressure to enter, and a check valve (9) is arranged at the air inlet (8); The air circuit of the air inlet (8) includes three circuits, one circuit is directly connected to the valve cavity of the relay valve (6); one circuit is connected to the first solenoid valve (2); and another circuit is connected to the pneumatic control valve (5); The first solenoid valve (2) is electrically connected to the electronic control unit (1); the air inlet path of the first solenoid valve (2) is connected to the air inlet (8); the air outlet path is divided into two paths, one path is connected to the control chamber of the pneumatic control valve (5), and the other path is connected to the two-way check valve (7); The control chamber of the pneumatic control valve (5) is connected to the first solenoid valve (2) and the second solenoid valve (3); the air outlet path of the pneumatic control valve (5) includes an air path connected to the third solenoid valve (4); The third solenoid valve (4) is electrically connected to the electronic control unit (1), and the gas outlet path of the third solenoid valve (4) includes a gas path connected to the two-way one-way valve (7); The control chamber of the pneumatic control valve (5) is externally connected to a two-position two-way valve (23); the control air port (43) of the two-position two-way valve (23) is externally connected to a manual knob valve (31); the air inlet end of the manual knob valve (31) is connected to the air inlet (8); one end of the air outlet end of the manual knob valve (31) is connected to the control air port (43) and the other end is connected to a second two-way one-way valve (32); the air outlet end of the second two-way one-way valve (32) is connected to the first two-way one-way valve (7); and the other air inlet end of the second two-way one-way valve (32) is connected to the foot valve air pressure outlet (33).

2. The commercial vehicle electronic parking system with a mechanical redundant control mechanism according to claim 1, characterized in that: The manual knob valve is arranged in the cab.

3. The commercial vehicle electronic parking system with a mechanical redundancy control mechanism according to claim 1, characterized in that: The second solenoid valve (3) is electrically connected to the electronic control unit (1), and the air outlet path of the second solenoid valve (3) is connected to the exhaust port (11); the two-way one-way valve (7) is connected to the upper chamber of the relay valve (6), the air outlet (12) for connecting the parking is connected to the relay valve (6), and the exhaust port (11) is connected to the relay valve (6).

4. The commercial vehicle electronic parking system with a mechanical redundancy control mechanism according to claim 2, characterized in that: The air outlet path of the pneumatic control valve (5) further comprises an air path connected to the exhaust port (11).

5. The commercial vehicle electronic parking system with a mechanical redundant control mechanism according to claim 2, characterized in that: The first solenoid valve (2) and the second solenoid valve (3) are two-position two-way normally closed solenoid valves, the third solenoid valve (4) is a two-position two-way normally open solenoid valve; and the pneumatic control valve (5) is a two-position three-way pneumatic control valve (5).

6. The commercial vehicle electronic parking system with a mechanical redundancy control mechanism according to claim 2, characterized in that: It also includes an air pressure sensor (13), which is connected to the air outlet (12) and is used to detect the air pressure of the air outlet (12). The air pressure sensor (13) is electrically connected to the electronic control unit (1), and the air outlet (12) is used to be connected to the parking chamber.

7. The commercial vehicle electronic parking system with a mechanical redundancy control mechanism according to claim 1, characterized in that: Also included is a backup air port (22) for connecting to a trailer parking brake module. 8.EPB valve assembly, characterized by: An electronic parking system for commercial vehicles with a mechanically redundant control mechanism according to any one of claims 1 to 7 is integrated.

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