A dual-channel electric proportional valve and engine exhaust bypass control system

Abstract

This utility model provides a dual-channel electro-proportional valve and an engine exhaust gas bypass control system, relating to the field of proportional valve technology, to solve the technical problem of large system space and complex layout caused by setting multiple electro-proportional valves to control multiple targets in the prior art; a dual-channel electro-proportional valve, by setting a first exhaust port, a second exhaust port, a first solenoid valve and a second solenoid valve, and setting a connecting air port in the housing, the first solenoid valve and the second solenoid valve share an intake port, and can accurately control different targets under the condition of the same air source input, such as synchronously controlling the opening of the exhaust gas bypass valve and the exhaust pressure of the oil-gas separator. The convenience of integrating the dual-channel electro-proportional valve can further save space in the vehicle engine, and while taking into account precise control, it can also contribute to the design goals of engine miniaturization and lightweighting; it also relates to an engine exhaust gas bypass control system, including the above-mentioned dual-channel electro-proportional valve.

Description

Technical Field

[0001] This utility model relates to the field of proportional valve technology, specifically to a dual-channel electric proportional valve and an engine exhaust bypass control system. Background Technology

[0002] Electric proportional valves are widely used in engine pneumatic control systems. They receive commands from the engine electronic control unit (ECU) and output precisely proportional air pressure to drive or control various actuators, such as the turbocharger's wastegate valve, exhaust brake valve, transmission clutch, and some braking systems, thereby achieving optimized management of engine operating conditions.

[0003] With the continuous advancement of engine control technology, the demand for multi-objective coordinated control is becoming increasingly prominent. For example, in some high-efficiency engine systems, it is desirable to simultaneously and independently control the opening of the turbocharger bypass valve and the exhaust back pressure of the oil-gas separator precisely, in order to improve power response while optimizing crankcase ventilation and oil consumption. To meet such multi-objective control requirements, the traditional technical solution mainly involves equipping each control objective with a separate electro-proportional valve. While this solution can achieve independent control, it requires multiple valve bodies, independent installation space, and complex piping connections, resulting in a large system footprint and complex layout, which contradicts the development trend of engine miniaturization and lightweighting. Utility Model Content

[0004] To address the shortcomings of existing technologies, the first objective of this utility model is to provide a dual-channel electro-proportional valve to solve the technical problem that the existing technology of setting multiple electro-proportional valves to control multiple targets results in a large system footprint and complex layout.

[0005] To solve the above-mentioned technical problems, this utility model provides a dual-channel electro-proportional valve, comprising: The shell has an air inlet, a first air outlet, and a second air outlet on its outer wall, and a connecting air outlet inside the shell that communicates with the air inlet, the first air outlet, and the second air outlet. The first solenoid valve is connected to the housing and controls the opening and closing of the connecting air passage and the first air outlet passage; The second solenoid valve is connected to the housing and controls the opening and closing of the connecting air passage and the second air outlet; The PCB board is connected inside the housing; The first pressure sensor is connected to the PCB board and is used to detect the pressure of the first air outlet. The second pressure sensor is connected to the PCB board and is used to detect the pressure of the second air outlet. The first solenoid valve, the second solenoid valve, the first pressure sensor, and the second pressure sensor are all electrically connected to the PCB board.

[0006] With the above structure, the dual-channel electro-proportional valve of this utility model has the following advantages: by setting a first outlet, a second outlet, a first solenoid valve, and a second solenoid valve, and by setting a common connecting air passage for the first and second solenoid valves in the housing, and by having the first and second solenoid valves share an intake passage, a single-input-dual-output working mode can be achieved. Under the condition of the same air source input, different targets can be precisely controlled, such as synchronously controlling the opening of the exhaust bypass valve and the outlet pressure of the oil-gas separator. The convenience of integrating the dual-channel electro-proportional valve can further save space for the vehicle engine. While taking into account precise control, it also helps to achieve the design goals of engine miniaturization and lightweighting.

[0007] As an improvement, the connecting air passage runs through the side walls at both ends of the housing, and a sealing steel ball is connected to both ends of the connecting air passage. With this structure, by setting sealing steel balls at both ends of the connecting air passage, a sealed, central air supply channel that runs through the housing is formed. This ensures that the compressed air input from the air inlet is evenly and stably distributed to the first solenoid valve and the second solenoid valve, eliminating the potential problem of inconsistent pressure control characteristics between the two channels due to differences in the air supply path. This lays a uniform air supply foundation for the independent and precise control of the dual-channel output.

[0008] As an improvement, the housing is provided with a first detection air passage and a second detection air passage, which are respectively connected to the first and second air outlet passages. The detection ends of the first and second pressure sensors are located in the first and second detection air passages, respectively. With this structure, by setting up independent first and second detection air passages that are respectively connected to the first and second air outlet passages, and placing the detection ends of the pressure sensors directly in them, direct and close-range measurement of the air outlet pressure is achieved. This design shortens the pressure feedback transmission path, reduces the delay and attenuation of the air pressure signal, thereby improving the response speed and feedback accuracy of the control system, and making the pressure closed-loop control more sensitive and accurate.

[0009] As an improvement, the housing has an internal cavity with a PCB board connected inside. The outer wall of the housing has a ventilator that communicates with the cavity and is connected to a waterproof and breathable membrane. A first sealing ring connects the first pressure sensor to the first detection airway, preventing communication between the cavity and the first detection airway. Similarly, a second sealing ring connects the second pressure sensor to the second detection airway, preventing communication between the cavity and the second detection airway. With this structure, the cavity maintains constant atmospheric pressure through the waterproof and breathable membrane, providing a stable and reliable absolute pressure reference (i.e., local atmospheric pressure) for both pressure sensors. The pressure sensors actually measure the difference between the outlet pressure and the ambient pressure, effectively avoiding measurement errors caused by pressure changes in the sealed cavity inside the valve body or the intrusion of external moisture. This significantly improves the long-term stability and environmental adaptability of the pressure detection.

[0010] As an improvement, the housing is provided with a first buffer chamber and a second buffer chamber, which are respectively connected to the first detection air passage and the second detection air passage; with this structure, the first buffer chamber and the second buffer chamber can play a role in stabilizing the pressure.

[0011] As an improvement, both the first and second solenoid valves include a moving iron core assembly, the outer surface of which is coated with a low-friction coefficient coating. This structure reduces one bushing part, thereby reducing production steps and lowering costs.

[0012] As an improvement, the low-friction coefficient coating is made of Teflon material.

[0013] As an improvement, the first and second solenoid valves are centrally symmetrically distributed with the connecting air passage as the axis; this structure further ensures the consistency of the intake characteristics of the first and second solenoid valves.

[0014] The second objective of this utility model is to provide an engine exhaust gas bypass control system, including the aforementioned dual-channel electro-proportional valve, as well as a turbocharger, an exhaust gas bypass valve, an air compressor, and an oil-gas separator. The dual-channel electro-proportional valve is connected to the air compressor, the exhaust gas bypass valve, and the oil-gas separator, and the turbocharger is connected to the exhaust gas bypass valve.

[0015] With the above structure, the engine exhaust bypass control system of this utility model has the following advantages: by setting a first exhaust port, a second exhaust port, a first solenoid valve and a second solenoid valve, and setting a common connecting air passage for the first solenoid valve and the second solenoid valve in the housing, and the first solenoid valve and the second solenoid valve sharing an intake port, a single input-dual output working mode can be realized. Under the condition of the same air source input, different targets can be precisely controlled, and the opening degree of the exhaust bypass valve and the exhaust pressure of the oil-gas separator can be controlled synchronously. The convenience of the dual-channel electric proportional valve integration can further save space for the vehicle engine. While taking into account precise control, it also helps to achieve the design goals of engine miniaturization and lightweighting. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the dual-channel electro-proportional valve in this utility model.

[0017] Figure 2 This is a three-dimensional structural diagram of the dual-channel electro-proportional valve in this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the dual-channel electro-proportional valve in this utility model from another perspective.

[0019] Figure 4 This is a cross-sectional view of the dual-channel electro-proportional valve in this utility model from another perspective.

[0020] Figure 5 This is a schematic diagram of the engine exhaust bypass control system in this utility model.

[0021] Reference numerals: 1. Housing; 2. Inlet duct; 3. First outlet duct; 4. Second outlet duct; 5. Connecting duct; 6. First solenoid valve; 7. Second solenoid valve; 8. PCB board; 9. First pressure sensor; 11. Sealing steel ball; 12. First detection duct; 13. Receiving cavity; 14. Waterproof and breathable membrane; 15. First sealing ring; 16. First buffer cavity; 17. Moving iron core assembly; 18. Intensifier; 19. Waste gas bypass valve; 20. Air compressor; 21. Oil-gas separator. Detailed Implementation

[0022] The following is a detailed description of a dual-channel electro-proportional valve and an engine exhaust bypass control system according to the present invention, with reference to the accompanying drawings.

[0023] like Figures 1 to 4As shown, a dual-channel electro-proportional valve includes a housing 1, a first solenoid valve 6, a second solenoid valve 7, a PCB board 8, a first pressure sensor 9, and a second pressure sensor. The outer wall of the housing 1 has an air inlet 2, a first air outlet 3, and a second air outlet 4. The housing 1 also has a connecting airway 5 that communicates with the air inlet 2, the first air outlet 3, and the second air outlet 4. Figure 1 As shown, the connecting air passage 5 penetrates the side walls at both ends of the housing 1, and sealing steel balls 11 are connected to both ends of the connecting air passage 5.

[0024] like Figure 1 As shown, the first solenoid valve 6 is connected to the housing 1 and controls the opening and closing between the connecting air passage 5 and the first air outlet 3. The second solenoid valve 7 is connected to the housing 1 and controls the opening and closing between the connecting air passage 5 and the second air outlet 4. The connecting air passage 5 is connected to the main chamber of the first solenoid valve 6 and the main chamber of the second solenoid valve 7. The first solenoid valve 6 and the second solenoid valve 7 are centrally symmetrically distributed about the connecting air passage 5 to maintain consistent air intake characteristics.

[0025] PCB board 8 is connected inside housing 1. First pressure sensor 9 is connected to PCB board 8 and used to detect the pressure of first air outlet 3. Second pressure sensor is connected to PCB board 8 and used to detect the pressure of second air outlet 4. First solenoid valve 6, second solenoid valve 7, first pressure sensor 9, and second pressure sensor are all electrically connected to PCB board 8.

[0026] like Figure 4 As shown, the housing 1 is provided with a first detection air channel 12 and a second detection air channel. The first detection air channel 12 and the second detection air channel are respectively connected to the first air outlet 3 and the second air outlet 4. The detection end of the first pressure sensor 9 and the detection end of the second pressure sensor are respectively located in the first detection air channel 12 and the second detection air channel. The housing 1 is provided with a receiving cavity 13. The PCB board 8 is connected in the receiving cavity 13. The outer wall of the housing 1 is provided with a ventilator that communicates with the receiving cavity 13. The ventilator is connected to a waterproof and breathable membrane 14. A part of the first pressure sensor 9 and the second pressure sensor are also located in the receiving cavity 13.

[0027] Without the first pressure sensor 9 and the second pressure sensor, the receiving cavity 13 is connected to the first detection airway 12 and the second detection airway; and if Figure 4 As shown, a first sealing ring 15 is connected between the first pressure sensor 9 and the first detection airway 12, and the first sealing ring 15 prevents the receiving cavity 13 from communicating with the first detection airway 12. Similarly, a second sealing ring is connected between the second pressure sensor and the second detection airway, and the second sealing ring prevents the receiving cavity 13 from communicating with the second detection airway.

[0028] In addition, continue to refer to Figure 4The housing 1 is provided with a first buffer chamber 16 and a second buffer chamber, which are respectively connected to the first detection air passage 12 and the second detection air passage. The housing 1 is also provided with a venting passage corresponding to the first solenoid valve 6 and the second solenoid valve 7. The specific structure and working principle of the venting passage are existing technologies and will not be described in detail here.

[0029] Both the first solenoid valve 6 and the second solenoid valve 7 include a moving iron core assembly 17. The outer surface of the moving iron core assembly 17 is coated with a low friction coefficient coating. In this embodiment, the low friction coefficient coating is made of Teflon material.

[0030] like Figure 5 As shown, this utility model also relates to an engine exhaust gas bypass control system, including the aforementioned dual-channel electro-proportional valve, as well as a turbocharger 18, an exhaust gas bypass valve 19, an air compressor 20, and an oil-gas separator 21. The dual-channel electro-proportional valve is connected to the air compressor 20, the exhaust gas bypass valve 19, and the oil-gas separator 21, and the turbocharger 18 is connected to the exhaust gas bypass valve 19. The air compressor 20 serves as a compressed air power source, and its electrical connectors on the housing 1 are connected to the engine ECU, receiving commands from the ECU. The microprocessor on the PCB board 8 adjusts the opening of the corresponding valve head based on the received commands and the difference between the values ​​measured by the pressure sensors at different outlets, thereby adjusting the target pressure at the outlet.

[0031] This utility model achieves a single-input-dual-output working mode by setting up a first air outlet 3, a second air outlet 4, a first solenoid valve 6, and a second solenoid valve 7, and by setting up a connecting air passage 5 shared by the first solenoid valve 6 and the second solenoid valve 7 in the housing 1, and the first solenoid valve 6 and the second solenoid valve 7 sharing an air inlet 2. Under the condition of the same air source input, it can accurately control different targets, and synchronously control the opening of the exhaust bypass valve 19 and the outlet pressure of the oil-gas separator 21. The convenience of integrating the dual-channel electro-proportional valve can further save space for the vehicle engine. While taking into account precise control, it also helps to achieve the design goals of engine miniaturization and weight reduction.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A dual channel electric proportional valve characterized by, include: The housing (1) has an air inlet (2), a first air outlet (3) and a second air outlet (4) on its outer wall, and a connecting airway (5) inside the housing (1) that communicates with the air inlet (2), the first air outlet (3) and the second air outlet (4). The first solenoid valve (6) is connected to the housing (1) and controls the opening and closing of the connecting air passage (5) and the first air outlet (3); The second solenoid valve (7) is connected to the housing (1) and controls the opening and closing of the connecting air passage (5) and the second air outlet (4); PCB board (8) is connected inside the housing (1); A first pressure sensor (9) is connected to the PCB board (8) and is used to detect the pressure of the first air outlet (3); The second pressure sensor is connected to the PCB board (8) and is used to detect the pressure of the second air outlet (4); The first solenoid valve (6), the second solenoid valve (7), the first pressure sensor (9), and the second pressure sensor are all electrically connected to the PCB board (8).

2. The dual-channel electro-proportional valve according to claim 1, characterized in that, The connecting air passage (5) penetrates the side walls of both ends of the housing (1), and sealing steel balls (11) are connected to both ends of the connecting air passage (5).

3. The dual-channel electro-proportional valve according to claim 1, characterized in that, The housing (1) is provided with a first detection airway (12) and a second detection airway. The first detection airway (12) and the second detection airway are respectively connected to the first air outlet (3) and the second air outlet (4). The detection end of the first pressure sensor (9) and the detection end of the second pressure sensor are respectively located in the first detection airway (12) and the second detection airway.

4. The dual-channel electro-proportional valve according to claim 3, characterized in that, The housing (1) has a receiving cavity (13) inside, the PCB board (8) is connected to the receiving cavity (13), the outer wall of the housing (1) has a ventilator communicating with the receiving cavity (13), the ventilator is connected to a waterproof and breathable membrane (14), the first pressure sensor (9) is connected to the first detection air channel (12) with a first sealing ring (15), the first sealing ring (15) makes the receiving cavity (13) and the first detection air channel (12) not communicate with each other, the second pressure sensor is connected to the second detection air channel with a second sealing ring, the second sealing ring makes the receiving cavity (13) and the second detection air channel not communicate with each other.

5. The dual-channel electro-proportional valve according to claim 3, characterized in that, The housing (1) is provided with a first buffer chamber (16) and a second buffer chamber, the first buffer chamber (16) and the second buffer chamber being connected to the first detection airway (12) and the second detection airway, respectively.

6. The dual-channel electro-proportional valve according to claim 1, characterized in that, Both the first solenoid valve (6) and the second solenoid valve (7) include a moving iron core assembly (17), the outer surface of which is coated with a low friction coefficient coating.

7. The dual-channel electro-proportional valve according to claim 6, characterized in that, The low-friction coefficient coating is made of Teflon material.

8. The dual-channel electro-proportional valve according to claim 1, characterized in that, The first solenoid valve (6) and the second solenoid valve (7) are centrally symmetrical about the connecting air passage (5).

9. An engine exhaust gas bypass control system, characterized in that, The dual-channel electro-proportional valve according to any one of claims 1 to 8 further includes a booster (18), an exhaust bypass valve (19), an air compressor (20), and an oil-gas separator (21), wherein the dual-channel electro-proportional valve is connected to the air compressor (20), the exhaust bypass valve (19), and the oil-gas separator (21), and the booster (18) is connected to the exhaust bypass valve (19).

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