Commercial vehicle electronic parking system with temporary traffic function, electronic parking assembly and control method

Abstract

The invention relates to the field of parking braking, and discloses a commercial vehicle electronic parking system with a temporary traffic function, an electronic parking assembly and a control method.When a fourth electromagnetic valve is powered on, air source compressed air passes through the fourth electromagnetic valve, and a temporary stop air path opens a driving relay valve; when the air pressure reaches the set value, the fourth electromagnetic valve is powered off, and the temporary stop air path is in a pressure maintaining state; when the third electromagnetic valve is opened and the third electromagnetic valve is closed, compressed air of the temporary stop air path is communicated to the exhaust port through the third electromagnetic valve. The system not only can provide a common parking function, but also can provide a temporary parking function, and is suitable for a common commercial vehicle assembled with an ABS (Anti-lock Brake System).

Description

Technical Field

[0001] The present invention relates to the field of commercial vehicle EPB systems, and mainly relates to a commercial vehicle electronic parking system with a temporary traffic opening function, a control method, and an electronic parking assembly. Background Art

[0002] CN213292269U discloses a pneumatic electronic parking brake module for commercial vehicles. By adopting a pneumatic pilot valve structure, it can maintain the current parking / release state when the system suddenly loses power, thereby improving vehicle safety. Moreover, since the coil does not need to be energized for a long time, the service life and reliability of the system are improved.

[0003] However, it cannot achieve a temporary stop function. For a typical air brake system to execute a temporary stop, it requires the EPB to issue a temporary stop request, which is then received and executed by the service brake system; the service brake to actively execute the temporary stop function; or the EPB to implement a temporary stop using an external electronically controlled relay valve. All of these functions require additional electronically controlled relay valves or increased control capabilities of the service brake system. Summary of the Invention

[0004] The present invention addresses the shortcomings of the prior art and provides an electronic parking system and control method for commercial vehicles with a temporary traffic release function, as well as an electronic parking assembly.

[0005] An electronic parking system for commercial vehicles with a temporary traffic-opening function includes a control unit, a normally closed solenoid valve 1, a normally closed solenoid valve 2, a normally closed solenoid valve 3, a normally closed solenoid valve 4, and a relay valve; an air inlet, an air outlet 1 connected to a parking chamber, an air outlet 2 connected to a service brake valve, and an exhaust port;

[0006] Solenoid valve 1, solenoid valve 2, solenoid valve 3, and solenoid valve 4 are all electrically connected to the control unit;

[0007] The air inlet is connected to three air paths, one to the air inlet end of solenoid valve 1, one to the relay valve, and one to the air inlet end of solenoid valve 4; solenoid valve 1 and solenoid valve 2 are connected in series, and the control chamber of the relay valve is connected to the air path between solenoid valve 1 and solenoid valve 2;

[0008] The outlet end of the solenoid valve 2 is connected to the exhaust port; the relay valve is connected to the exhaust port, and the relay valve is also connected to the parking chamber; the solenoid valve 2, the solenoid valve 3 and the solenoid valve 4 are connected in series, and one end of the air path connecting the solenoid valve 2 to the exhaust port is connected between the solenoid valve 2 and the solenoid valve 3; there is also a temporary parking air path between the solenoid valve 3 and the solenoid valve 4, and the outlet end of the temporary parking air path is the air outlet 2;

[0009] When solenoid valve four is energized, the compressed air from the gas source passes through solenoid valve four and the temporary stop gas circuit to open the driving relay valve; when the air pressure reaches the setting, solenoid valve four is de-energized and the temporary stop gas circuit is in a pressure-maintaining state; when solenoid valve three is opened and the solenoid valve is closed, the compressed air in the temporary stop gas circuit is connected to the exhaust port through solenoid valve three.

[0010] Preferably, it further includes an air pressure sensor 1, which is connected to the air outlet 1 and is connected to the controller and transmits signals to the controller.

[0011] Preferably, it also includes a second air pressure sensor, which is connected to the temporary stop air circuit, and the second air pressure sensor is connected to the controller and transmits signals to the controller.

[0012] Preferably, the solenoid valve 1, the solenoid valve 2, the solenoid valve 3 and the solenoid valve 4 are all two-position, two-way normally closed solenoid valves.

[0013] Preferably, a one-way valve is further included, which is arranged at the air inlet and before it is dispersed into three air paths.

[0014] Preferably, a control air circuit is further included, and the control air circuit is connected to the control chamber of the relay valve.

[0015] The commercial vehicle electronic parking assembly integrates the above-mentioned commercial vehicle electronic parking system with temporary traffic function.

[0016] A control method for a commercial vehicle electronic parking system, wherein the parking system adopts the above-mentioned commercial vehicle electronic parking system with a temporary traffic release function; the control method includes the following working conditions:

[0017] When the parking function is in effect, after the controller receives the parking signal, it opens the second solenoid valve, and the other solenoid valves are in the normally closed state. The compressed air in the control chamber of the relay valve is discharged from the exhaust port through the second solenoid valve, and the control piston of the relay valve opens the air path connecting the first outlet and the exhaust port; when the air pressure at the first outlet is detected to be 0, the second solenoid valve is closed, and the vehicle is in the parking state;

[0018] When the vehicle is switched to the driving function, the controller opens the solenoid valve 1 after receiving the driving signal, and the other solenoid valves are in the closed state. The compressed air in the air inlet enters the control chamber of the relay valve. The piston of the relay chamber moves downward under the action of the compressed air, and the air inlet is connected to the air outlet 1 through the relay valve. When the air pressure sensor 1 detects that the pressure of the air outlet 1 meets the requirement, the solenoid valve 1 is closed, the air outlet 1 is in the pressure maintaining state, and the vehicle is in the driving state.

[0019] When the controller detects that parking activation is required, the controller opens solenoid valve 4, and the other solenoid valves are in the closed state. The compressed air from the air inlet enters the air outlet 2 through the solenoid valve 4 and the temporary stop air path. The compressed air from the air outlet 2 opens the driving relay valve; after the air pressure sensor 2 detects that the air pressure at the air outlet 2 reaches the set value, the solenoid valve 4 is closed, the air outlet 2 is in the pressure maintaining state, and the temporary parking is activated;

[0020] When the controller receives the signal to exit temporary parking, the controller opens solenoid valve three, and the other solenoid valves are in the closed state. The compressed air at the air outlet two is discharged from the exhaust port through solenoid valve three. When the air pressure at the air outlet two is 0, the solenoid valve three is closed. At this time, the vehicle is in the temporary parking inactive state.

[0021] Compared with the existing technology, this solution has the following beneficial effects: the system can automatically perform the temporary parking function without configuring an additional electronic control system, integrating the temporary parking function into one, and can meet the needs of commercial vehicles equipped with only ABS systems to achieve temporary parking functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the control function diagram of the parking system.

[0023] The technical names of the figures in the figure are: 1-control unit, 2-solenoid valve 1, 3-solenoid valve 2, 4-solenoid valve 3, 5-solenoid valve 4, 6-air inlet, 7-exhaust port, 8-air outlet 1, 9-air outlet 2, 10-pressure sensor 1, 11-relay valve, 111-control chamber, 12-air pressure sensor 2, 13-control port. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] The electronic parking system for commercial vehicles with a temporary traffic-opening function includes a control unit, a normally closed solenoid valve 1 2, a solenoid valve 2 3, a solenoid valve 3 4, a solenoid valve 4 5, and a relay valve 11; it also includes an air inlet 6, an air outlet 1 8 connected to the parking chamber, an air outlet 2 9 connected to the service brake valve, and an exhaust port 7; its assembly can adapt to the temporary parking function and can meet the temporary parking needs of vehicles equipped only with an ABS system.

[0027] In this embodiment, solenoid valve 1 2, solenoid valve 2 3, solenoid valve 3 4, and solenoid valve 4 5 are all electrically connected to the control unit; that is, the on and off of solenoid valve 1 2, solenoid valve 2 3, solenoid valve 3 4, and solenoid valve 4 5 are all controlled by the control unit.

[0028] The air inlet 6 is connected to three air paths, one of which is connected to the air inlet end of the solenoid valve 1 2, one of which is connected to the relay valve 11, and the other of which is connected to the air inlet end of the solenoid valve 4 5;

[0029] Solenoid valve 1 2 and solenoid valve 2 3 are connected in series, that is, solenoid valve 1 2 and solenoid valve 2 3 are connected through an air path, and the control chamber 111 of the relay valve 11 is connected to the air path between solenoid valve 1 2 and solenoid valve 2 3;

[0030] The outlet end of the solenoid valve 2 3 is connected to the exhaust port 7; the relay valve 11 is connected to the exhaust port 7, and the relay valve 11 is also connected to the parking chamber; the solenoid valve 2 3, the solenoid valve 3 4 and the solenoid valve 4 5 are connected in series, and one end of the air path connecting the solenoid valve 2 3 to the exhaust port 7 is connected between the solenoid valve 2 3 and the solenoid valve 3 4; there is also a temporary parking air path between the solenoid valve 3 4 and the solenoid valve 4 5, and the outlet end of the temporary parking air path is the outlet 2 9;

[0031] When the solenoid valve four 5 is energized, the compressed air from the gas source passes through the solenoid valve four 5 and the temporary stop gas circuit to open the driving relay valve 11; when the air pressure reaches the setting, the solenoid valve four 5 is de-energized and the temporary stop gas circuit is in a pressure maintaining state; when the solenoid valve three 4 is opened and the solenoid valve is closed, the compressed air in the temporary stop gas circuit is connected to the exhaust port 7 through the solenoid valve three 4.

[0032] This embodiment also includes an air pressure sensor 10, which is connected to the air outlet 8 and is connected to the controller to transmit signals to the controller. The main function of the air pressure sensor 10 is to detect the air pressure in the parking chamber. When the air pressure meets the required level, the controller controls the opening and closing of the corresponding solenoid valve.

[0033] The device also includes a second air pressure sensor 12, which is connected to the temporary stop air circuit and is connected to the controller and transmits signals to the controller. The second air pressure sensor 12 is used to detect the air pressure in the temporary stop air circuit. The controller controls the opening and closing of the corresponding solenoid valve based on the signal from the second air pressure sensor 12.

[0034] The working status is as follows:

[0035] When the vehicle is parked:

[0036] When the vehicle switches to the parking state, solenoid valve 2 and 3 are energized, and the other solenoid valves are disconnected. The compressed air in the relay valve 11 control chamber 111 is discharged through the solenoid valve 2 and 3, and the relay piston moves upward. The parking chamber is directly connected to the exhaust port 7 through the relay valve 11, and the vehicle enters the parking state;

[0037] When parking is released;

[0038] Solenoid valve 2 is energized, and the other solenoid valves are de-energized. The compressed air from the air source enters the control chamber 111 of the relay valve 11, exerting pressure on the relay valve 11 and driving the relay piston downward, so that the air source is connected to the parking chamber through the relay piston. The compressed air from the air source builds up pressure in the parking chamber. When the pressure sensor 10 detects that the pressure meets the requirement, the solenoid valve 2 is de-energized, the parking chamber is in a pressure-maintaining state, and the parking brake is released.

[0039] When the temporary stop is activated, the solenoid valve 45 is opened and the other solenoid valves are closed. The compressed air pressure passes through the solenoid valve 45 and the temporary stop air path to the driving relay valve 11. The driving relay valve 11 opens under the action of pressure. When the air pressure sensor 2 12 detects that the air pressure reaches the set value, the solenoid valve 45 is closed, the temporary stop air path maintains pressure, and the temporary stop is activated;

[0040] When exiting temporary parking, open solenoid valve three 4 and the other solenoid valves are closed. The compressed air in the temporary parking air circuit is discharged from the exhaust port 7 through the solenoid valve three 4. When the air pressure sensor two 12 detects that the air pressure discharge is completed, close the solenoid valve three 4. At this time, the vehicle is in the temporary parking inactive state.

[0041] Example 2

[0042] The electronic parking assembly for commercial vehicles adopts the parking system of Example 1.

[0043] Example 3

[0044] A control method for a commercial vehicle electronic parking system, wherein the parking system adopts the commercial vehicle electronic parking system with a temporary traffic opening function of the first embodiment; the control method includes the following working conditions:

[0045] When the parking function is in effect, the controller opens solenoid valve 2 (3) after receiving the parking signal, while the other solenoid valves are in the normally closed state. The compressed air in the control chamber 111 of the relay valve 11 is discharged from the exhaust port 7 through the solenoid valve 2 (3). The control piston of the relay valve 11 opens the air path connecting the air outlet 1 (8) and the exhaust port 7. When the air pressure at the air outlet 1 (8) is detected to be 0, the solenoid valve 2 (3) is closed, and the vehicle is in the parking state.

[0046] When the vehicle is switched to the driving mode, the controller receives a driving signal and opens solenoid valve 2, while the other solenoid valves remain closed. The compressed air from the air inlet 6 enters the control chamber 111 of the relay valve 11. The piston of the relay chamber moves downward under the action of the compressed air, and the air inlet 6 is connected to the air outlet 8 through the relay valve 11. When the air pressure sensor 10 detects that the pressure at the air outlet 8 meets the requirement, the solenoid valve 2 closes, the air outlet 8 is in a pressure-maintaining state, and the vehicle enters the driving mode.

[0047] When the controller detects that the vehicle needs to be parked, it opens the solenoid valve 45, and the other solenoid valves are closed. The compressed air from the air inlet 6 enters the air outlet 29 through the solenoid valve 45 and the temporary stop air path. The compressed air from the air outlet 29 opens the driving relay valve 11. When the air pressure sensor 212 detects that the air pressure at the air outlet 29 reaches the set value, it closes the solenoid valve 45, and the air outlet 29 is in a pressure-maintaining state, and the temporary parking is activated.

[0048] When the controller receives the signal to exit temporary parking, the controller opens solenoid valve three 4, and the other solenoid valves are in the closed state. The compressed air in the air outlet two 9 is discharged from the exhaust port 7 through the solenoid valve three 4. When the air pressure discharged from the air outlet two 9 is 0, the solenoid valve three 4 is closed. At this time, the vehicle is in the temporary parking inactive state.

Claims

1. An electronic parking system for commercial vehicles with a temporary traffic function, characterized by: It includes a control unit, a normally closed solenoid valve 1, a solenoid valve 2, a solenoid valve 3, a solenoid valve 4, and a relay valve; it also includes an air inlet, an air outlet 1 connected to the parking chamber, an air outlet 2 connected to the service brake valve, and an exhaust port; Solenoid valve 1, solenoid valve 2, solenoid valve 3, and solenoid valve 4 are all electrically connected to the control unit; The air inlet is connected to three air paths, one to the air inlet end of solenoid valve 1, one to the relay valve, and one to the air inlet end of solenoid valve 4; solenoid valve 1 and solenoid valve 2 are connected in series, and the control chamber of the relay valve is connected to the air path between solenoid valve 1 and solenoid valve 2; The outlet end of the solenoid valve 2 is connected to the exhaust port; the relay valve is connected to the exhaust port, and the relay valve is also connected to the parking chamber; the solenoid valve 2, the solenoid valve 3 and the solenoid valve 4 are connected in series, and one end of the air path connecting the solenoid valve 2 to the exhaust port is connected between the solenoid valve 2 and the solenoid valve 3; there is also a temporary parking air path between the solenoid valve 3 and the solenoid valve 4, and the outlet end of the temporary parking air path is the air outlet 2; When solenoid valve four is energized, the compressed air from the gas source passes through solenoid valve four and the temporary stop gas circuit to open the driving relay valve; when the air pressure reaches the setting, solenoid valve four is de-energized and the temporary stop gas circuit is in a pressure-maintaining state; when solenoid valve three is opened and the solenoid valve is closed, the compressed air in the temporary stop gas circuit is connected to the exhaust port through solenoid valve three.

2. The commercial vehicle electronic parking system with temporary traffic function according to claim 1, characterized in that: It also includes an air pressure sensor 1, which is connected to the air outlet 1 and is connected to the controller and transmits signals to the controller.

3. The commercial vehicle electronic parking system with temporary traffic function according to claim 1, characterized in that: It also includes a second air pressure sensor, which is connected to the temporary stop air path. The second air pressure sensor is connected to the controller and transmits signals to the controller.

4. The commercial vehicle electronic parking system with temporary traffic function according to claim 1, characterized in that: Solenoid valve 1, solenoid valve 2, solenoid valve 3 and solenoid valve 4 are all two-position, two-way normally closed solenoid valves.

5. The commercial vehicle electronic parking system with temporary traffic function according to claim 1, characterized in that: It also includes a one-way valve, which is arranged at the air inlet and before it is dispersed into three air paths.

6. The commercial vehicle electronic parking system with temporary traffic function according to claim 1, characterized in that: It also includes a control air circuit, which is connected to the control chamber of the relay valve.

7. The electronic parking brake assembly for commercial vehicles is characterized by: The electronic parking system for commercial vehicles with a temporary traffic release function as described in any one of claims 1 to 6 is integrated.

8. A control method for a commercial vehicle electronic parking system, characterized in that: The parking system adopts the commercial vehicle electronic parking system with temporary traffic function as described in any one of claims 1 to 6; the control method includes the following working conditions: When the parking function is in effect, after the controller receives the parking signal, it opens the second solenoid valve, and the other solenoid valves are in the normally closed state. The compressed air in the control chamber of the relay valve is discharged from the exhaust port through the second solenoid valve, and the control piston of the relay valve opens the air path connecting the first outlet and the exhaust port; when the air pressure at the first outlet is detected to be 0, the second solenoid valve is closed, and the vehicle is in the parking state; When the vehicle is switched to the driving function, the controller opens the solenoid valve 1 after receiving the driving signal, and the other solenoid valves are in the closed state. The compressed air in the air inlet enters the control chamber of the relay valve. The piston of the relay chamber moves downward under the action of the compressed air, and the air inlet is connected to the air outlet 1 through the relay valve. When the air pressure sensor 1 detects that the pressure of the air outlet 1 meets the requirement, the solenoid valve 1 is closed, the air outlet 1 is in the pressure maintaining state, and the vehicle is in the driving state. When the controller detects that parking activation is required, the controller opens solenoid valve 4, and the other solenoid valves are in the closed state. The compressed air from the air inlet enters the air outlet 2 through the solenoid valve 4 and the temporary stop air path. The compressed air from the air outlet 2 opens the driving relay valve; after the air pressure sensor 2 detects that the air pressure at the air outlet 2 reaches the set value, the solenoid valve 4 is closed, the air outlet 2 is in the pressure maintaining state, and the temporary parking is activated; When the controller receives the signal to exit temporary parking, the controller opens solenoid valve three, and the other solenoid valves are in the closed state. The compressed air at the air outlet two is discharged from the exhaust port through solenoid valve three. When the air pressure at the air outlet two is 0, the solenoid valve three is closed. At this time, the vehicle is in the temporary parking inactive state.

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