Integrated gas fuel metering valve and control method thereof
By designing an integrated gas fuel metering valve, the problem of poor dirt resistance and durability of gas nozzles has been solved, achieving high-precision fuel control and system stability. It is suitable for various gas systems, breaks the foreign monopoly, and reduces costs.
Patent Information
- Application Number
- CN202511333182.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2025-11-18
AI Technical Summary
Existing gas nozzles have poor resistance to contamination and durability, making them unsuitable for low-pressure gas supply systems. Furthermore, they are difficult to control precisely in terms of air-fuel ratio when there are large differences in fuel composition, resulting in unstable engine fuel control.
It adopts an integrated gas fuel metering valve, which includes a one-piece molded metering valve body, a direct-drive suspension motor and multiple sensors. Through continuous flow control and precise gas flow calculation, it reduces transmission errors, improves control accuracy, and is suitable for engine systems of various displacements.
It achieves high-precision fuel control, reduces pressure fluctuations, improves the system's resistance to contamination and reliability, is suitable for low-pressure gas supply systems, covers a variety of gas systems, and reduces costs.
Smart Images
Figure CN120968971A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a metering valve, in particular to an integrated gas fuel metering valve and a control method thereof, and belongs to the technical field of flow control of gas fuel engines. BACKGROUND
[0002] The flow control of the current fuel supply system of the gas fuel engine mainly adopts a gas nozzle, and the performance of the nozzle directly affects the accurate control of the fuel of the engine. At present, the gas nozzles in China are mainly imported from foreign countries, and the poor dirt resistance and durability of the gas nozzles have been a major criticism of the gas system. Moreover, the nozzle must be opened under a certain injection pressure, and it is difficult to be applied to a low-pressure gas supply system. Taking a natural gas engine as an example, the main component of natural gas is methane, and in addition, it also contains hydrocarbon gases such as ethane, propane and butane, and non-hydrocarbon gases such as nitrogen, CO2 and H2S. The methane content of general gas reservoir natural gas is more than 90%. The methane content of oilfield associated gas accounts for 65% to 80%. The components of natural gas in different regions differ greatly, resulting in a great difference in the calorific value of the fuel. The existing fuel control system mainly targets the current fuel type, calculates the fuel quantity according to the air quantity and the target air-fuel ratio, and adjusts the fuel quantity through the air-fuel ratio correction method. When the fuel components differ greatly, the air-fuel ratio control is difficult to achieve the ideal effect. The actual air-fuel ratio often deviates greatly from the target value. SUMMARY
[0003] The purpose of the present application is to provide an integrated gas fuel metering valve with a unique structural design, high control precision, and breaking the monopoly of similar foreign products in internal combustion engines. Not only solves the problem of poor dirt resistance and durability of the gas nozzle, but also adopts continuous flow control to reduce pressure fluctuations. A single product can cover various displacement engine gas systems. At the same time, the expanded product can also be applied to mine machinery, marine engine and other gas systems.
[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows:
[0005] An integrated gas fuel metering valve includes a one-piece metering valve body. The valve body has an inlet pipe and an exhaust pipe connected by a connecting hole. A valve core is installed in the exhaust pipe above the connecting hole, mounted on a valve stem. The valve stem is mounted on the output rod of a direct-drive levitation motor, and the diameter of the valve core is larger than the diameter of the connecting hole. The metering valve body has a receiving cavity, within which the direct-drive levitation motor is located. A first cover seals the first opening of the receiving cavity. A through hole is located at the bottom of the receiving cavity, through which the valve stem passes. A second opening is located near the end of the exhaust pipe, with a second cover sealing it. The second opening is located below the valve stem. The first cover seals the receiving cavity, ensuring the direct-drive levitation motor is sealed, and requires machining the corresponding through hole through the first opening. The second cover seals the second opening, which is used to machine a through hole. Since the metering valve body is a casting, the through hole is machined later. Furthermore, this application employs a direct-drive suspended motor without any transmission structure, thus eliminating accumulated errors and significantly reducing transmission errors, resulting in more precise flow control. The flow area of the gaseous fuel far exceeds that of the nozzle orifice, facilitating the removal of gaseous impurities. The process is simple, washable, and has good dirt resistance. The continuous flow fuel supply method minimizes temperature and pressure fluctuations of the gaseous fuel during operation, ensuring a stable air-fuel ratio in the engine and further reducing pollutant emissions. For low-pressure pipeline gas, no pressurization device is required, resulting in a compact system structure, reduced costs, and high reliability.
[0006] In the aforementioned integrated gas fuel metering valve, a first pressure sensor is installed in the inlet pipe, a second pressure sensor is installed in the exhaust pipe, a temperature sensor is installed in the exhaust pipe, and a displacement sensor is installed on the valve stem. The metering valve body has an electrical cavity, in which a controller is installed. The first pressure sensor, the second pressure sensor, the displacement sensor, and the direct-drive suspension motor are all electrically connected to the controller. The sealing cover of the electrical cavity has an interface terminal, which is connected to the controller. The displacement sensor uses position magnetoelectric feedback, achieving a control accuracy at the micrometer level.
[0007] In the aforementioned integrated gas fuel metering valve, a gasket is provided on the valve stem, the gasket is fitted with the valve core, and the gasket is located on the valve stem at one end near the connecting hole; the port of the air inlet pipe has a first flange structure, the first flange structure has a first sealing groove, and the first sealing ring is provided in the first sealing groove; the port of the exhaust pipe has a second flange structure, the second flange structure has a second sealing groove, and the second sealing ring is provided in the second sealing groove.
[0008] In the aforementioned integrated gas fuel metering valve, the probe of the first pressure sensor is located inside the intake pipe, the probe of the second pressure sensor is located inside the exhaust pipe, the probe of the temperature sensor is located inside the exhaust pipe, and the bodies of the first pressure sensor, the second pressure sensor, and the temperature sensor are all located inside the electrical cavity.
[0009] The control method for the integrated gas fuel metering valve described above uses the following method to control the gas output rate of the exhaust pipe:
[0010] The air pressure P1 in the intake pipe is detected by the first pressure sensor, the air pressure P2 in the exhaust pipe is detected by the second pressure sensor, and the temperature T0 in the exhaust pipe is detected by the temperature sensor.
[0011] The gas flow rate can be calculated using the following formula.
[0012]
[0013] Where Aeff represents the effective flow area of the gas, which is linearly related to the valve stem lift; Mdot represents the gas flow rate; C1 represents an empirical parameter, C2 represents an empirical parameter, and C3 represents an empirical parameter.
[0014] Based on Aeff, the required position of the valve stem is determined, and the valve stem is moved to the designated position by controlling the direct drive suspension motor, thereby controlling the gas flow rate in the exhaust pipe.
[0015] Compared with existing technologies, this invention features a unique structural design, high control precision, and breaks the monopoly of similar foreign products in internal combustion engines. It not only solves the problem of poor dirt resistance and durability of gas nozzles, but also reduces pressure fluctuations through continuous flow control. Furthermore, it can be a single product covering gas systems for engines of various displacements. Simultaneously, its extended products can also be applied to gas systems in mining machinery, turbines, and other applications. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;
[0017] Figure 2 yes Figure 1 A sectional view.
[0018] Reference numerals: 1-First cover, 2-Direct drive suspension motor, 3-Metering valve body, 4-First pressure sensor, 5-Intake pipe, 6-Displacement sensor, 7-Valve stem, 8-Second cover, 9-Exhaust pipe, 10-Second pressure sensor, 11-Temperature sensor, 12-Valve core, 13-Sealing cover, 14-Interface terminal, 15-Receiving cavity.
[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation
[0020] Embodiment 1 of the present invention: An integrated gas fuel metering valve includes an integrally formed metering valve body 3. The metering valve body 3 has an inlet pipe 5 and an exhaust pipe 9, which are connected by a connecting hole. A valve core 12 is provided in the exhaust pipe 9 above the connecting hole. The valve core 12 is mounted on a valve stem 7, which is mounted on the output rod of a direct-drive levitation motor 2. The diameter of the valve core 12 is larger than the diameter of the connecting hole. The metering valve body 3 has a receiving cavity 15, in which the direct-drive levitation motor 2 is located. A first cover 1 is provided at the first opening of the receiving cavity 15, which seals the first opening of the receiving cavity 15. A through hole is provided at the bottom of the receiving cavity 15, through which the valve stem 7 passes. The end of the inlet pipe 5 near the exhaust pipe 9 has a second opening, at which a second cover 8 is provided, which seals the second opening of the inlet pipe 5. The second opening is located below the valve stem 7.
[0021] Example 2: An integrated gas fuel metering valve includes an integrally formed metering valve body 3. The metering valve body 3 has an inlet pipe 5 and an exhaust pipe 9, which are connected by a connecting hole. A valve core 12 is installed in the exhaust pipe 9 above the connecting hole. The valve core 12 is mounted on a valve stem 7, which is mounted on the output rod of a direct-drive levitation motor 2. The diameter of the valve core 12 is larger than the diameter of the connecting hole. The metering valve body 3 has a receiving cavity 15, in which the direct-drive levitation motor 2 is located. A first cover 1 is provided at the first opening of the receiving cavity 15, which seals the first opening. A through hole is provided at the bottom of the receiving cavity 15, through which the valve stem 7 passes. The end of the inlet pipe 5 near the exhaust pipe 9 has a second opening, at which a second cover 8 is provided, which seals the second opening of the inlet pipe 5. The second opening is located below the valve stem 7.
[0022] A first pressure sensor 4 is installed in the intake pipe 5, a second pressure sensor 10 is installed in the exhaust pipe 9, a temperature sensor 11 is installed in the exhaust pipe 9, and a displacement sensor 6 is installed on the valve stem 7; the metering valve body 3 has an electrical cavity, in which a controller is installed, and the first pressure sensor 4, the second pressure sensor 10, the displacement sensor 6 and the direct drive suspension motor 2 are all electrically connected to the controller; the sealing cover 13 of the electrical cavity is provided with an interface terminal 14, which is connected to the controller.
[0023] Example 3: An integrated gas fuel metering valve includes an integrally formed metering valve body 3. The metering valve body 3 has an inlet pipe 5 and an exhaust pipe 9, which are connected by a connecting hole. A valve core 12 is installed in the exhaust pipe 9 above the connecting hole. The valve core 12 is mounted on a valve stem 7, which is mounted on the output rod of a direct-drive levitation motor 2. The diameter of the valve core 12 is larger than the diameter of the connecting hole. The metering valve body 3 has a receiving cavity 15, in which the direct-drive levitation motor 2 is located. A first cover 1 is provided at the first opening of the receiving cavity 15, which seals the first opening. A through hole is provided at the bottom of the receiving cavity 15, through which the valve stem 7 passes. The end of the inlet pipe 5 near the exhaust pipe 9 has a second opening, at which a second cover 8 is provided, which seals the second opening of the inlet pipe 5. The second opening is located below the valve stem 7.
[0024] A first pressure sensor 4 is installed in the intake pipe 5, a second pressure sensor 10 is installed in the exhaust pipe 9, a temperature sensor 11 is installed in the exhaust pipe 9, and a displacement sensor 6 is installed on the valve stem 7; the metering valve body 3 has an electrical cavity, in which a controller is installed, and the first pressure sensor 4, the second pressure sensor 10, the displacement sensor 6 and the direct drive suspension motor 2 are all electrically connected to the controller; the sealing cover 13 of the electrical cavity is provided with an interface terminal 14, which is connected to the controller.
[0025] A gasket is provided on the valve stem 7, and the gasket fits against the valve core 12. The gasket is located on the valve stem 7 at the end near the connecting hole. The port of the intake pipe 5 has a first flange structure, on which a first sealing groove is provided, and a first sealing ring is provided inside the first sealing groove. The port of the exhaust pipe 9 has a second flange structure, on which a second sealing groove is provided, and a second sealing ring is provided inside the second sealing groove. The probe of the first pressure sensor 4 is located inside the intake pipe 5, the probe of the second pressure sensor 10 is located inside the exhaust pipe 9, and the probe of the temperature sensor 11 is located inside the exhaust pipe 9. The bodies of the first pressure sensor 4, the second pressure sensor 10, and the temperature sensor 11 are all located inside the electrical cavity.
[0026] The control method for an integrated gas fuel metering valve described in the above embodiments controls the gas output rate of the exhaust pipe 9 using the following method:
[0027] The air pressure P1 in the intake pipe 5 is detected by the first pressure sensor 4, the air pressure P2 in the exhaust pipe 9 is detected by the second pressure sensor 10, and the temperature T0 in the exhaust pipe 9 is detected by the temperature sensor 11.
[0028] The gas flow rate can be calculated using the following formula.
[0029]
[0030] Where Aeff represents the effective flow area of the gas, which is linearly related to the lift of valve stem 7; Mdot represents the gas flow rate; C1 represents an empirical parameter, C2 represents an empirical parameter, and C3 represents an empirical parameter.
[0031] Based on Aeff's determination of the required position of valve stem 7, the direct-drive suspension motor 2 is controlled to move valve stem 7 to the designated position, thereby controlling the gas flow rate of exhaust pipe 9.
Claims
1. An integrated gas fuel metering valve, characterized in that, It includes an integrally formed metering valve body (3), which has an air inlet pipe (5) and an exhaust pipe (9) inside, and the air inlet pipe (5) and the exhaust pipe (9) are connected by a connecting hole; A valve core (12) is installed in the exhaust pipe (9) above the connecting hole. The valve core (12) is installed on the valve stem (7). The valve stem (7) is installed on the output rod of the direct drive suspension motor (2). The diameter of the valve core (12) is larger than the diameter of the connecting hole. The metering valve body (3) has a receiving cavity (15), the direct drive suspension motor (2) is located in the receiving cavity (15), and the first opening of the receiving cavity (15) has a first cover (1), which seals the first opening of the receiving cavity (15). The bottom of the receiving cavity (15) has a perforation through which the valve stem (7) passes; the end of the air intake pipe (5) near the exhaust pipe (9) has a second opening, and a second cover (8) is provided at the second opening. The second cover (8) seals the second opening of the air intake pipe (5), and the second opening is located below the valve stem (7).
2. The integrated gas fuel metering valve according to claim 1, characterized in that, A first pressure sensor (4) is installed in the intake pipe (5), a second pressure sensor (10) is installed in the exhaust pipe (9), a temperature sensor (11) is installed in the exhaust pipe (9), and a displacement sensor (6) is installed on the valve stem (7). The metering valve body (3) has an electrical cavity, in which a controller is installed. The first pressure sensor (4), the second pressure sensor (10), the displacement sensor (6), and the direct drive suspension motor (2) are all electrically connected to the controller. An interface terminal (14) is installed on the sealing cover (13) of the electrical cavity, and the interface terminal (14) is connected to the controller.
3. The integrated gas fuel metering valve according to claim 1, characterized in that, A gasket is provided on the valve stem (7), and the gasket fits into the valve core (12). The gasket is located on the valve stem (7) at one end near the connecting hole. The port of the air intake pipe (5) has a first flange structure, and a first sealing groove is provided on the first flange structure. A first sealing ring is provided in the first sealing groove. The port of the exhaust pipe (9) has a second flange structure, and a second sealing groove is provided on the second flange structure. A second sealing ring is provided in the second sealing groove.
4. An integrated gas fuel metering valve according to claim 2, characterized in that, The probe of the first pressure sensor (4) is located inside the intake pipe (5), the probe of the second pressure sensor (10) is located inside the exhaust pipe (9), the probe of the temperature sensor (11) is located inside the exhaust pipe (9), and the main body of the first pressure sensor (4), the main body of the second pressure sensor (10), and the main body of the temperature sensor (11) are all located inside the electrical cavity.
5. A control method for an integrated gas fuel metering valve according to any one of claims 1 to 4, characterized in that, The gas output rate of the exhaust pipe (9) is controlled by the following method: The air pressure P1 in the intake pipe (5) is detected by the first pressure sensor (4), the air pressure P2 in the exhaust pipe (9) is detected by the second pressure sensor (10), and the temperature T0 in the exhaust pipe (9) is detected by the temperature sensor (11). The gas flow rate can be calculated using the following formula. Where Aeff represents the effective flow area of the gas, which is linearly related to the lift of the valve stem (7); Mdot represents the gas flow rate; C1 represents an empirical parameter, C2 represents an empirical parameter, and C3 represents an empirical parameter; Based on Aeff, the valve stem (7) is determined to be in the desired position. The valve stem (7) is then moved to the designated position by controlling the direct drive suspension motor (2), thereby controlling the gas flow rate of the exhaust pipe (9).