Split high-pressure common rail system with controllable pressure fluctuations

Abstract

The present application relates to a kind of split high-pressure common rail systems of controllable pressure fluctuation, including oil inlet connector, split common rail pipe, common rail pipe connector, transient pressure sensor, actuator, actuator valve, oil outlet connector, signal processing and control system.The present application uses common rail pipe connector to connect split common rail pipe, transient pressure sensor is installed on each split common rail pipe, real-time measurement fuel pressure in each rail pipe, and pressure signal is transmitted back to signal processing and control system, and actuator and actuator valve are installed on common rail pipe connector.Signal processing and control system analyze the pressure fluctuation and difference in each split common rail pipe, according to the analysis result, control actuator valve opening angle, adjust the cross-sectional area of through hole in common rail pipe connector, real-time control pressure fluctuation in split common rail pipe, reach the purpose of reducing pressure fluctuation in common rail pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of engine common rail systems, specifically relating to a split-type high-pressure common rail system with controllable pressure fluctuations. Background Technology

[0002] The common rail in the fuel system has a pressure storage function, which can make the fuel injection process and the fuel supply process independent, achieve high-pressure fuel injection, improve fuel atomization quality, and improve the engine combustion process.

[0003] In existing systems, high-pressure common rails are typically forged as a single piece and filled with high-pressure fuel. However, in practical applications, factors such as high fuel pressure, internal defects during the forging process, and fluctuations in fuel pressure within the confined space can lead to damage and cracking of the high-pressure common rail, necessitating its replacement. Furthermore, because multi-cylinder engines alternate fuel injection between cylinders and require large injection volumes under heavy loads, pressure fluctuations within the high-pressure common rail can cause inconsistencies in fuel injection volumes across different cylinder cycles and between cylinders, impacting engine performance.

[0004] Therefore, as engines further increase their demands for higher injection pressure and more precise injection quantity, it is necessary to further increase the injection pressure while reducing pressure fluctuations within the fuel supply system. Summary of the Invention

[0005] This invention provides a split-type high-pressure common rail system with controllable pressure fluctuations. The technical problem to be solved is to further increase the injection pressure while reducing pressure fluctuations within the fuel supply system.

[0006] To solve the above technical problems, the present invention provides a split-type high-pressure common rail system with controllable pressure fluctuations, characterized in that: it includes an oil inlet connector (1), a split-type common rail pipe (2), a common rail pipe connector (3), a transient pressure sensor (4), an actuator (5), an actuator valve (6), an oil outlet connector (7), and a signal processing and control system (8); the oil inlet connector (1) is connected to the split-type common rail pipe (2) and supplies oil to the split-type common rail pipe; two adjacent split-type common rail pipes (2) are connected by a common rail pipe. The connector (3) is connected, and a transient pressure sensor (4) and an oil outlet connector (7) are installed at the top and bottom of the middle of each split common rail pipe (2); an actuator (5) is installed on the outside of the common rail pipe connector (3), and an actuator valve (6) is installed inside the pipe; the other end of the oil outlet connector (7) is connected to a high-pressure oil pipe or an injector; the signal processing and control system (8) receives signals from the transient pressure sensors (4) on multiple split common rail pipes (2) in real time, and sends signals to the actuator (5) to control the opening angle of the actuator valve (6).

[0007] Beneficial Effects: The device of this invention uses a common rail connector to connect split common rails. Each split common rail is equipped with a transient pressure sensor to measure the fuel pressure in each rail in real time and transmit the pressure signal back to the signal processing and control system. The common rail connector is equipped with an actuator and an actuator valve. The signal processing and control system analyzes the pressure fluctuations and differences in each split common rail. Based on the analysis results, it controls the opening angle of the actuator valve and adjusts the cross-sectional area of ​​the through-hole in the common rail connector to control the pressure fluctuations in the split common rails in real time, thereby reducing pressure fluctuations within the common rail.

[0008] The advantages of this invention are: 1. The common rail pipe is a modular design with a consistent structure, facilitating modular manufacturing and easy replacement when a section of the common rail pipe is damaged. Furthermore, different lengths of modular common rail pipes can be manufactured to match the cylinder center distance; 2. Real-time measurement of pressure fluctuations within the common rail pipe, and comparative analysis of pressure fluctuations in each section of the modular common rail pipe through signal processing and control systems, actively controlling the actuator and actuator valve opening angle to reduce pressure fluctuations within the rail pipe. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a split-type high-pressure common rail system with controllable pressure fluctuations according to the present invention.

[0010] Figure 2 This is a cross-sectional view of the connection method of the split common rail pipe, common rail pipe connector, actuator, and actuator valve of the present invention;

[0011] In the diagram: 1-Inlet connector, 2-Split common rail, 3-Common rail connector, 4-Transient pressure sensor, 5-Actuator, 6-Actuator valve, 7-Outlet connector, 8-Signal processing and control system. Detailed Implementation

[0012] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0013] like Figures 1-2 As shown, the present invention proposes a split-type high-pressure common rail system with controllable pressure fluctuation, including an oil inlet connector 1, a split-type common rail pipe 2, a common rail pipe connector 3, a transient pressure sensor 4, an actuator 5, an actuator valve 6, an oil outlet connector 7, and a signal processing and control system 8.

[0014] The inlet connector 1 connects to the split common rail pipe 2 and supplies oil to it. The split common rail pipe 2 is a high-strength pipe with a through-hole and threaded ends. It connects to the common rail connector 3 or the inlet connector 1. It has holes on the top and bottom surfaces to install the transient pressure sensor 4 and the outlet connector 7, respectively. The common rail connector 3 is a high-strength pipe with a through-hole and external threads at both ends. It connects to the split common rail pipe 2. An actuator 5 is installed outside the pipe, and an actuator valve 6 is installed inside the pipe. The actuator 5 and the actuator valve 6 are coaxially connected through a through-hole in the wall of the common rail connector 3. One end of the outlet connector 7 connects to the split common rail pipe 2, and the other end can connect to a high-pressure oil pipe or an injector. The signal processing and control system 8 receives signals from the transient pressure sensors 4 on the multiple split common rail pipes 2 in real time and sends signals to the actuators 5 to control the opening angle of the actuator valve 6.

[0015] The split-type common rail pipe has a consistent split structure, which facilitates modular production and manufacturing, and makes it easy to replace if a section of the common rail pipe is damaged. Furthermore, split-type common rail pipes of different lengths can be manufactured to match the cylinder center distance.

[0016] The transient pressure sensor 4 measures the pressure fluctuation inside the common rail pipe in real time. The signal processing and control system 8 compares and analyzes the pressure fluctuation inside each section of the split common rail pipe 2, actively controls the opening angle of the actuator 5 and actuator valve 6, adjusts the cross-sectional area of ​​the through hole inside the common rail pipe connector, and reduces the pressure fluctuation inside the rail pipe.

[0017] The aforementioned split-type high-pressure common rail system with controllable pressure fluctuations has threaded connections between its parts, and the sealing between its parts can be achieved through methods such as, but is not limited to, planar sealing and ball head sealing, which can meet liquid pressure requirements of 30MPa and above.

[0018] The length of the split common rail 2 can be matched and machined according to the cylinder center distance to meet the needs of engines with different displacements and numbers of cylinders.

Claims

1. A split-type high-pressure common rail system with controllable pressure fluctuations, characterized in that: The system includes an inlet connector (1), a split common rail (2), a common rail connector (3), a transient pressure sensor (4), an actuator (5), an actuator valve (6), an outlet connector (7), and a signal processing and control system (8). The inlet connector (1) connects to the split common rail (2) and supplies oil to it. Two adjacent split common rails (2) are connected by a common rail connector (3). A transient pressure sensor (4) and an outlet connector (7) are installed at the top and bottom of the middle of each split common rail (2). An actuator (5) is installed outside the common rail connector (3), and an actuator valve (6) is installed inside the connector. The other end of the outlet connector (7) is connected to a high-pressure oil pipe or an injector. The signal processing and control system (8) receives signals from the transient pressure sensors (4) on multiple split common rails (2) in real time and sends signals to the actuator (5) to control the opening angle of the actuator valve (6).

2. The split-type high-pressure common rail system with controllable pressure fluctuation according to claim 1, characterized in that: The actuator (5) receives the signal from the signal processing and control system (8) and controls the opening angle of the actuator valve (6) in a timely manner to adjust the cross-sectional area of ​​the through hole in the common rail connector.

3. The split-type high-pressure common rail system with controllable pressure fluctuation according to claim 1, characterized in that: The connection between the parts is a threaded connection, and the sealing between the parts adopts a planar seal and a ball seal to meet the liquid pressure requirements of 30MPa and above.

4. The split-type high-pressure common rail system with controllable pressure fluctuation according to claim 1, characterized in that: The length of the split common rail (2) can be matched and processed according to the cylinder center distance to meet the needs of engines with different displacements and cylinder numbers.

5. A split-type high-pressure common rail system with controllable pressure fluctuations according to claim 1, characterized in that: The signal processing and control system (8) actively controls the opening angle of the actuator (5) and actuator valve (6) according to the pressure fluctuation in each section of the split common rail pipe (2) to reduce the pressure fluctuation in the rail pipe.

6. A split-type high-pressure common rail system with controllable pressure fluctuations according to claim 1, characterized in that: The split common rail pipe (2) is a high-strength pipe with a through hole in the inner diameter and threaded structure at both ends of the inner diameter.

7. A split-type high-pressure common rail system with controllable pressure fluctuations according to claim 1, characterized in that: The common rail connector (3) is a high-strength tube with a through hole and external threads at both ends.

8. A split-type high-pressure common rail system with controllable pressure fluctuations according to claim 1, characterized in that: The actuator (5) and actuator valve (6) are coaxially connected through a through hole in the wall of the common rail connector (3).

9. A split-type high-pressure common rail system with controllable pressure fluctuations according to claim 1, characterized in that: The split-type common rail pipe (2) is a modular design.

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