A gas-liquid control system for electric vehicles

Abstract

The present invention relates to the field of electric vehicles, and specifically discloses a gas-liquid control system for electric vehicles. The gas-liquid control system includes a high-pressure fluid supply module, a pneumatic execution module and a hydraulic execution module; the high-pressure fluid supply module includes a drive unit, a pump unit and a gas compression device, and the drive unit is connected to the pump unit and the gas compression device at the same time; the gas compression device also includes a pressure relief component, and the pressure relief component includes a normally closed pressure relief valve; each of the cylinders corresponds to at least one pressure relief component, and the pressure relief air inlet of the pressure relief valve is connected to the corresponding cylinder; when the air pressure of the pneumatic execution module reaches a preset value, the pressure relief valve opens. The gas compression device in the gas-liquid control system described above works synchronously with the drive unit, and the pressure relief component controls the output air pressure of the gas compression device, which has the advantages of low cost and stable system operation.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and in particular to a gas-liquid control system for electric vehicles. Background Art

[0002] The gas-liquid control system is an important part of the automobile. It mainly includes a high-pressure fluid supply module, a pneumatic execution module and a hydraulic execution module. The high-pressure fluid supply module is used to generate high-pressure fluid and supply it to the pneumatic execution module and the hydraulic execution module; the pneumatic execution module includes the automobile braking system, etc., and the hydraulic execution module includes the steering system, etc.

[0003] Common high-pressure fluid supply modules include air compressors and oil pumps. In gasoline-powered vehicles, these are driven by the generator, while in new energy vehicles, these are typically driven by electric motors.

[0004] In a gas-liquid control system, hydraulic and pneumatic actuators operate in different modes. Specifically, hydraulic actuators typically require a continuous supply of high-pressure liquid, while pneumatic actuators typically only require an intermittent supply of high-pressure air during operation. Separate drive units are typically required to meet the operating requirements of the hydraulic and pneumatic actuators.

[0005] In order to reduce the size of the gas-liquid control system and save space, an integrated high-pressure fluid supply system has been designed, particularly for electric vehicles, in which the same motor is used to simultaneously drive the air compressor and oil pump. A Chinese invention application, publication number CN 106080761A, discloses an integrated mechanism for an air compressor and a hydraulic steering pump, comprising an air compressor, an electromagnetic clutch, a coupling, a motor, and a hydraulic steering pump. One end of the motor is connected to the air compressor via a coupling and an electromagnetic clutch, which controls the intermittent operation of the air compressor. The other end of the motor is connected to the hydraulic steering pump. This mechanism achieves the advantage of using a single motor to simultaneously drive the air compressor and the steering oil pump, offering the advantage of high integration. However, the air compressor in this mechanism requires frequent starting and stopping, and the electromagnetic clutch has a short service life. Furthermore, the electromagnetic clutch is expensive and difficult to maintain, resulting in a high lifecycle cost for the system. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a gas-liquid control system for electric vehicles, in which the gas compression device and the drive unit work synchronously, and the output gas pressure of the gas compression device is controlled by a pressure relief component, which has the advantages of low cost and stable system operation.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a gas-liquid control system for an electric vehicle, comprising a high-pressure fluid supply module, a pneumatic execution module and a hydraulic execution module;

[0008] The high-pressure fluid supply module includes a drive unit, a pump unit and a gas compression device. The drive unit is connected to the pump unit and the gas compression device at the same time and drives the pump unit and the gas compression device to work; the gas compression device is connected to the pneumatic execution module and provides a high-pressure gas source to the pneumatic execution module; the pump unit is connected to the hydraulic execution module and provides a high-pressure liquid source to the hydraulic execution module;

[0009] The gas compression device includes a plurality of compression execution modules, each of which is provided with a cylinder;

[0010] The gas compression device further includes a pressure relief assembly, which includes a normally closed pressure relief valve; each cylinder corresponds to at least one pressure relief assembly, and the pressure relief air inlet of the pressure relief valve is connected to the corresponding cylinder;

[0011] When the air pressure of the pneumatic execution module reaches a preset value, the pressure relief valve opens.

[0012] During operation, the gas compression device and pump unit start and stop synchronously with the drive unit. The opening and closing of the pressure relief assembly controls whether the gas compression device delivers compressed air to the pneumatic actuator module, adapting to the pneumatic actuator module's operating mode. Compared with existing gas-liquid control systems, the gas compression device of this application is always in operation, avoiding frequent starts and stops, and has the advantages of low cost and stable system operation.

[0013] Preferably, the output end of the drive assembly is connected to the main shaft of the gas compression device via a coupling. The drive assembly and the gas compression device are directly connected, which simplifies the system structure.

[0014] Preferably, the gas compression device includes an outlet valve connected to the cylinder, and the opening pressure of the pressure relief valve is greater than the opening pressure of the outlet valve.

[0015] When the air pressure in the pneumatic actuator reaches the preset value, the outlet valve is blocked, the air pressure in the cylinder continues to rise, and the pressure relief valve opens to discharge the high-pressure gas in the cylinder. The pressure relief valve adopts a passive operating mode, which is simpler and more reliable than the electromagnetic control mode.

[0016] Preferably, the pressure relief valve is a solenoid valve; it also includes a control component, the control component includes a pressure sensor and a controller, the pressure sensor is used to monitor the air pressure of the pneumatic execution module; when the air pressure of the pneumatic execution module reaches a preset value, the controller controls the pressure relief valve to open.

[0017] Through electromagnetic control, the opening and closing status of the pressure relief valve is actively controlled to avoid frequent opening and closing of the pressure relief valve after the air pressure of the pneumatic actuator module reaches the preset value, thereby extending the service life of the pressure relief valve.

[0018] Preferably, the pressure relief valve includes a valve body and a valve stem, the valve body is provided with a drive chamber and a pressure relief chamber, the pressure relief inlet and the pressure relief outlet of the pressure relief valve are connected through the pressure relief chamber; the valve stem includes a drive segment and an execution segment, the drive segment corresponds to the drive chamber, and the execution segment corresponds to the pressure relief chamber; the valve stem has at least two position states relative to the valve body: in the first position state, the execution segment of the valve stem cuts off the connection between the pressure relief inlet and the pressure relief outlet of the pressure relief valve, and the pressure relief valve is in a normally closed state at this time; in the second position state, the pressure relief inlet and the pressure relief outlet of the pressure relief valve are connected, and the pressure relief valve is in a normally open state at this time; it also includes a control air circuit, which is connected to the drive chamber; by adjusting the air pressure in the drive chamber through the control chamber, the axial movement of the valve stem can be driven, and it can be switched between the first position state and the second position state.

[0019] Under normal circumstances, the valve stem is in the first position, and the high-pressure gas generated in the cylinder is discharged from the exhaust valve into the pneumatic execution module; when the air pressure of the pneumatic execution module is greater than the preset value, high-pressure gas is introduced into the drive chamber to drive the valve stem from the first position to the second position, and the pressure relief inlet and pressure relief outlet of the pressure relief valve are directly connected. The high-pressure gas generated in the cylinder is directly discharged from the pressure relief valve and is no longer supplied to the pneumatic execution module.

[0020] The opening and closing state of the pressure relief valve is controlled by pneumatic drive. Compared with the electromagnetic control direction, the pneumatic drive is a completely mechanical structure with a simple control system structure, lower overall cost and lower operating failure rate.

[0021] Preferably, the pneumatic execution module includes a main gas storage unit and a gas using unit, and the main gas storage unit is arranged between the gas compression device and the gas using unit; when the gas pressure of the main gas storage unit reaches a preset value, the pressure relief valve opens.

[0022] Preferably, an auxiliary air storage unit is further included, and the pressure relief outlet of the pressure relief valve is connected to the auxiliary air outlet unit.

[0023] Compared to directly exhausting the air to the outside, the auxiliary air storage unit temporarily stores the compressed gas discharged from the cylinder, which not only reduces energy loss but also prevents outside air from flowing back into the cylinder from the pressure relief valve, ensuring the cleanliness of the air entering the cylinder. Furthermore, frequent exhaust to the outside in the car inevitably interferes with other supporting systems, and the installation of the auxiliary air outlet unit can effectively solve this problem.

[0024] Preferably, the number of the cylinders is at least two, and the pressure relief assembly corresponds to the cylinders one-to-one; it also includes an air distribution channel, the air inlet of the air distribution channel is connected to the pressure relief outlet of the pressure relief valve on at least one of the cylinders, and the air outlet of the air distribution channel is directly connected to at least one other cylinder; the pressure relief outlet of any pressure relief valve corresponds to at least one air distribution channel, and any cylinder is directly connected to the outlet of at least one air distribution channel.

[0025] When the pressure relief valve opens, the air distribution channel connects the corresponding cylinders. By properly allocating the initial phases of each cylinder, during operation, when one cylinder exhausts, at least one of the other cylinders inhales, and the gas within the cylinders circulates between them. Driven by the motor, the gas compression device can maintain continuous operation while neither exhausting nor inhaling air outside the cylinders.

[0026] Preferably, the cylinders are divided into several air distribution groups, and the number of cylinders in each air distribution group is two; in the same air distribution group, the pressure relief outlet of the pressure relief valve on any cylinder is directly connected to another cylinder through the air distribution channel; the cylinders and pressure relief valves of different air distribution groups are not connected through the air distribution channel.

[0027] By setting up the gas distribution group, it is only necessary to ensure that the initial limit of the two cylinders in the gas distribution group differs by 180 degrees to ensure the normal operation of the gas compression device, which can simplify the gas distribution process to a certain extent.

[0028] Preferably, the cylinder includes at least a primary cylinder and a secondary cylinder, the number of the primary cylinders is at least two, and the number of the secondary cylinders is at least two; the air distribution channel includes a primary air distribution channel corresponding to the primary cylinder, and a secondary air distribution channel corresponding to the secondary cylinder.

[0029] Since the working pressure and cylinder volume of the first-stage cylinder and the second-stage cylinder are different, the gas distribution channels of the first-stage cylinder and the second-stage cylinder are set independently to ensure smoother and more reasonable operation of the gas compression device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a system flow chart of a gas-liquid control system for an electric vehicle according to a first embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of a high-pressure fluid supply module in a gas-liquid control system for an electric vehicle according to a first embodiment of the present invention;

[0032] Figure 3 A partial front cross-sectional view of a high-pressure fluid supply module in a gas-liquid control system for an electric vehicle according to a first embodiment of the present invention;

[0033] Figure 4 This is a system flow chart of a gas-liquid control system for an electric vehicle according to a third embodiment of the present invention;

[0034] Figure 5 This is a schematic structural diagram of a pressure relief valve in a gas-liquid control system for an electric vehicle according to a third embodiment of the present invention; at this time, the valve stem is in a first position;

[0035] Figure 6 This is a schematic structural diagram of a pressure relief valve in a gas-liquid control system for an electric vehicle according to a third embodiment of the present invention; at this time, the valve stem is in the second position;

[0036] Figure 7 Schematic diagram of the partial structure of a high-pressure fluid supply module in a gas-liquid control system for an electric vehicle according to a fourth embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the operation of a high-pressure fluid supply module in a gas-liquid control system for an electric vehicle according to a fifth embodiment of the present invention;

[0038] Figure 9 FIG6 is a schematic diagram showing the operation of a high-pressure fluid supply module in a gas-liquid control system for an electric vehicle according to a sixth embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Example 1

[0041] like Figure 1-Figure 3 As shown, a gas-liquid control system for an electric vehicle includes a high-pressure fluid supply module 1, a pneumatic execution module 3 and a hydraulic execution module 2.

[0042] Among them, such as Figure 1-Figure 3 As shown, the high-pressure fluid supply module 1 includes a drive unit 12, a pump unit 13, and a gas compression device 11. The drive unit 12 is connected to the pump unit 13 and the gas compression device 11, and drives the pump unit 13 and the gas compression device 11 to operate. The gas compression device 11 includes a plurality of compression execution modules, each of which is provided with a cylinder 111.

[0043] Specifically, such as Figure 1-Figure 3As shown, the drive assembly is a motor with output shafts at both ends. The output end of the drive assembly is connected to the main shaft of the gas compression device 11 via a coupling, and the output end of the drive assembly is connected to the main shaft of the pump unit 13 via a coupling. The drive assembly, gas compression device 11, and pump unit 13 are directly connected, simplifying the system structure.

[0044] Among them, such as Figure 1-Figure 3 As shown, the pneumatic actuator module 3 includes a braking system, and the gas compression device 11 is connected to the pneumatic actuator module 3 and provides a high-pressure gas source to the pneumatic actuator module 3. The hydraulic actuator module 2 includes a steering system, and the pump unit 13 is connected to the hydraulic actuator module 2 and provides a high-pressure liquid source to the hydraulic actuator module 2.

[0045] Specifically, such as Figure 1-Figure 3 As shown, the pneumatic execution module 3 includes a main gas storage unit 31 and a gas using unit 32 , and the main gas storage unit 31 is arranged between the gas compression device 11 and the gas using unit 32 .

[0046] like Figure 1-Figure 3 As shown, the gas compression device 11 further includes a pressure relief assembly, which includes a normally closed pressure relief valve 14. Each cylinder 111 corresponds to at least one pressure relief assembly, and the pressure relief air inlet 144 of the pressure relief valve 14 is connected to the corresponding cylinder 111.

[0047] When the air pressure of the pneumatic actuator module 3 reaches a preset value, the pressure relief valve 14 opens. The air pressure of the pneumatic actuator module 3 can be based on the inlet air pressure of the pneumatic actuator module 3. Specifically, when the air pressure of the main air storage unit 31 reaches a preset value, the pressure relief valve 14 opens.

[0048] During operation, the gas compression device 11 and the pump unit 13 are started and stopped synchronously with the drive unit 12. The opening and closing of the pressure relief assembly controls whether the gas compression device 11 supplies compressed air to the pneumatic actuator module 3, thereby adapting to the working mode of the pneumatic actuator module 3. Compared with existing gas-liquid control systems, the gas compression device 11 of the present application is always in operation, avoiding frequent starts and stops, and has the advantages of low cost and stable system operation.

[0049] Specifically, the gas compression device 11 includes an outlet valve connected to the cylinder 111, and the opening pressure of the pressure relief valve 14 is greater than the opening pressure of the outlet valve.

[0050] When the air pressure in the pneumatic actuator module 3 reaches a preset value, the air outlet of the air outlet valve is blocked, the air pressure in the cylinder 111 continues to rise, and the pressure relief valve 14 opens to discharge the high-pressure gas in the cylinder 111. The pressure relief valve 14 adopts a passive working mode, which is simpler and more reliable than the electromagnetic control working mode.

[0051] Furthermore, an auxiliary air storage unit is included, and the pressure relief outlet 143 of the pressure relief valve 14 is connected to the auxiliary air outlet unit. Compared with direct exhaust to the outside, the auxiliary air storage unit can temporarily store the compressed gas discharged from the cylinder 111. This not only reduces energy loss, but also prevents external air from flowing back into the cylinder 111 from the direction of the pressure relief valve 14, thereby ensuring the cleanliness of the air entering the cylinder 111. In addition, frequent exhaust to the outside in the vehicle will inevitably cause interference with other supporting systems of the vehicle. The provision of the auxiliary air outlet unit can effectively solve this problem.

[0052] Example 2

[0053] Compared to the first embodiment, this embodiment differs in that the pressure relief valve 14 is a solenoid valve. A control assembly is also included, comprising a pressure sensor and a controller. The pressure sensor is used to monitor the air pressure in the pneumatic actuator module 3. When the air pressure in the pneumatic actuator module 3 reaches a preset value, the controller controls the pressure relief valve 14 to open. Specifically, the pressure sensor detects the main air storage unit 31.

[0054] The opening and closing state of the pressure relief valve 14 is actively controlled by electromagnetic control to avoid frequent opening and closing of the pressure relief valve 14 after the air pressure of the pneumatic execution module 3 reaches a preset value, thereby extending the service life of the pressure relief valve 14.

[0055] Example 3

[0056] like Figure 4-Figure 6 As shown, compared with the first embodiment, this embodiment differs in that the pressure relief valve 14 includes a valve body, a valve stem 142, and a resilient reset member 141. A drive chamber 146 and a pressure relief chamber 145 are defined within the valve body. The pressure relief inlet 144 and the pressure relief outlet 143 of the pressure relief valve 14 are connected via the pressure relief chamber 145. The valve stem 142 includes a drive section and an actuator section. The drive section corresponds to the drive chamber 146, and the actuator section corresponds to the pressure relief chamber 145.

[0057] like Figure 4-Figure 6 As shown, the valve stem 142 has at least two positions relative to the valve body: in the first position, the actuator section of the valve stem 142 cuts off the communication between the pressure relief air inlet 144 and the pressure relief air outlet 143 of the pressure relief valve 14. Specifically, one end of the actuator section blocks the pressure relief air inlet 144 of the pressure relief valve 14, and the pressure relief valve 14 is in a normally closed state. In the second position, the pressure relief air inlet 144 and the pressure relief air outlet 143 of the pressure relief valve 14 are connected, and the pressure relief valve 14 is in a normally open state, and the return elastic member 141 is compressed.

[0058] like Figure 4-Figure 6As shown, it also includes a control air circuit 5, one end of which is connected to the driving chamber 146, and the other end is connected to the start execution module.

[0059] Specifically, the control air path 5 connects the main air storage unit 31 and the control chamber.

[0060] Under normal circumstances, the valve stem 142 is in the first position, and the high-pressure gas generated in the cylinder 111 is discharged from the exhaust valve into the pneumatic execution module 3; when the air pressure of the pneumatic execution module 3 is greater than the preset value, the high-pressure gas is introduced into the drive chamber 146 to drive the valve stem 142 from the first position to the second position, and the pressure relief inlet 144 and the pressure relief outlet 143 of the pressure relief valve 14 are directly connected, and the high-pressure gas generated in the cylinder 111 is directly discharged from the pressure relief valve 14 and is no longer supplied to the pneumatic execution module 3.

[0061] The opening and closing state of the pressure relief valve 14 is controlled by a pneumatic drive method. Compared with the electromagnetic control direction, the pneumatic drive method is a completely mechanical structure, the control system structure is simple, and the overall cost and operation failure rate are lower.

[0062] Example 4

[0063] like Figure 7 As shown, compared with Examples 1 to 3, this embodiment differs in that: there are at least two cylinders 111, and the pressure relief assembly corresponds one-to-one with each cylinder 111. It also includes an air distribution channel 4, the air inlet of which is connected to the pressure relief outlet 143 of the pressure relief valve 14 on at least one of the cylinders 111, and the air outlet of the air distribution channel 4 is directly connected to at least one other cylinder 111. Any pressure relief outlet 143 of the pressure relief valve 14 corresponds to at least one air distribution channel 4, and any cylinder 111 is directly connected to the air outlet of at least one air distribution channel 4.

[0064] like Figure 7 As shown, specifically, the pressure relief assembly corresponds to the cylinder 111 one by one, the pressure relief outlet 143 of each pressure relief valve 14 is connected to an air distribution channel 4, and correspondingly, each cylinder 111 corresponds to an air distribution channel 4.

[0065] When the pressure relief valve 14 is open, the gas distribution channel 4 connects the corresponding cylinders 111 to each other. By properly allocating the initial phases of each cylinder 111, during operation, when one cylinder 111 is exhausting, at least one of the other cylinders 111 is inhaling, and the gas within the cylinders 111 circulates among the cylinders 111. Driven by the motor, the gas compression device 11 can continue to operate while maintaining neither exhaust nor inhalation outside the cylinders 111.

[0066] When the number of cylinders 111 connected to each other is two, the initial phases of the cylinders 111 differ by 180°; when the number of cylinders 111 connected to each other is three, the initial phases of the cylinders 111 differ by 120°; when the number of cylinders 111 connected to each other is four, the initial phases of the cylinders 111 differ by 90°; and so on.

[0067] Example 5

[0068] like Figure 8 As shown, compared with the fourth embodiment, this embodiment differs in that the cylinders 111 are divided into several valve groups, each of which contains two cylinders 111. Within the same valve group, the pressure relief outlet 143 of the pressure relief valve 14 on any cylinder 111 is directly connected to another cylinder 111 via the valve channel 4; cylinders 111 in different valve groups are not connected to the pressure relief valve 14 via the valve channel 4.

[0069] By setting up the gas distribution group, it is only necessary to ensure that the initial limit of the two cylinders 111 in the gas distribution group differs by 180 degrees to ensure the normal operation of the gas compression device 11, which can simplify the gas distribution process to a certain extent.

[0070] Example 6

[0071] like Figure 9 As shown, compared with the fourth embodiment, the difference of this embodiment is that: the cylinder 111 includes at least a primary cylinder 1111 and a secondary cylinder 1112, the number of the primary cylinders 1111 is at least two, and the number of the secondary cylinders 1112 is at least two; the air distribution channel 4 includes a primary air distribution channel 41 corresponding to the primary cylinder 1111, and a secondary air distribution channel 42 corresponding to the secondary cylinder 1112.

[0072] Since the working pressures of the first-stage cylinder 1111 and the second-stage cylinder 1112 and the volumes of the cylinder 111 are different, the gas distribution channels 4 of the first-stage cylinder 1111 and the second-stage cylinder 1112 are set independently, that is, the first-stage cylinder 1111 and the second-stage cylinder 1112 are not connected through the gas distribution channel 4, which can ensure that the gas compression device 11 operates more smoothly and reasonably.

[0073] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas-liquid control system for an electric vehicle, comprising a high-pressure fluid supply module, a pneumatic actuator module, and a hydraulic actuator module; The high-pressure fluid supply module includes a drive unit, a pump unit and a gas compression device. The drive unit is connected to the pump unit and the gas compression device at the same time and drives the pump unit and the gas compression device to work; the gas compression device is connected to the pneumatic execution module and provides a high-pressure gas source to the pneumatic execution module; the pump unit is connected to the hydraulic execution module and provides a high-pressure liquid source to the hydraulic execution module; The gas compression device includes a plurality of compression execution modules, each of which is provided with a cylinder; Its characteristics are: The gas compression device further includes a pressure relief assembly, which includes a normally closed pressure relief valve; each cylinder corresponds to at least one pressure relief assembly, and the pressure relief air inlet of the pressure relief valve is connected to the corresponding cylinder; When the air pressure of the pneumatic actuator module reaches a preset value, the pressure relief valve opens; The pressure relief valve comprises a valve body and a valve stem, wherein a driving chamber and a pressure relief chamber are provided in the valve body, and a pressure relief air inlet and a pressure relief air outlet of the pressure relief valve are connected through the pressure relief chamber; The valve stem includes a driving segment and an execution segment, wherein the driving segment corresponds to the driving cavity, and the execution segment corresponds to the pressure relief cavity; The valve stem has at least two positions relative to the valve body: in the first position, the valve stem cuts off the communication between the pressure relief inlet and the pressure relief outlet of the pressure relief valve, and the pressure relief valve is in a normally closed state; in the second position, the pressure relief inlet and the pressure relief outlet of the pressure relief valve are connected, and the pressure relief valve is in a normally open state. The valve stem further includes a control air circuit, the control air circuit being in communication with the drive chamber; the air pressure in the drive chamber is adjusted through the control chamber to drive the axial movement of the valve stem and switch between the first position state and the second position state; There are at least two cylinders, and the pressure relief components correspond to the cylinders one by one; It also includes an air distribution channel, wherein the air inlet of the air distribution channel is connected to the pressure relief outlet of the pressure relief valve on at least one of the cylinders, and the air outlet of the air distribution channel is directly connected to at least one other cylinder; The pressure relief outlet of any pressure relief valve corresponds to at least one air distribution channel, and any cylinder is directly connected to the outlet of at least one air distribution channel.

2. The gas-liquid control system according to claim 1, characterized in that: The output end of the driving unit is connected to the main shaft of the gas compression device through a coupling.

3. The gas-liquid control system according to claim 1, characterized in that: The gas compression device comprises an outlet valve connected to the cylinder, and the opening pressure of the pressure relief valve is greater than the opening pressure of the outlet valve.

4. The gas-liquid control system according to claim 1, characterized in that: The pressure relief valve is a solenoid valve; it also includes a control component, which includes a pressure sensor and a controller. The pressure sensor is used to monitor the air pressure of the pneumatic execution module; when the air pressure of the pneumatic execution module reaches a preset value, the controller controls the pressure relief valve to open.

5. The gas-liquid control system according to any one of claims 1 to 4, characterized in that: The pneumatic execution module includes a main gas storage unit and a gas using unit, wherein the main gas storage unit is arranged between the gas compression device and the gas using unit; When the air pressure in the main air storage unit reaches a preset value, the pressure relief valve opens.

6. The gas-liquid control system according to any one of claims 1 to 4, characterized in that: It also includes an auxiliary air storage unit, and the pressure relief air outlet of the pressure relief valve is connected to the auxiliary air outlet unit.

7. The gas-liquid control system according to claim 1, characterized in that: The cylinders are divided into several valve distribution groups, and each valve distribution group has two cylinders; In the same gas distribution group, the pressure relief outlet of the pressure relief valve on any cylinder is directly connected to another cylinder through the gas distribution channel; The cylinders and pressure relief valves of different gas distribution groups are not connected through the gas distribution channels.

8. The gas-liquid control system according to claim 7, characterized in that: The cylinders include at least a primary cylinder and a secondary cylinder, the number of the primary cylinders is at least two, and the number of the secondary cylinders is at least two; The air distribution channel includes a primary air distribution channel corresponding to the primary cylinder and a secondary air distribution channel corresponding to the secondary cylinder.

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