High-pressure common rail injection measuring system

Abstract

The utility model discloses a high-pressure common rail injection measuring system which comprises a high-pressure pump, a motor and a controller, the output end of the motor is connected with a cam shaft, the cam shaft is matched with a plunger of the high-pressure pump, the controller is electrically connected with the high-pressure pump and the motor, the motor is provided with a position sensor, and the position sensor is connected with the high-pressure pump. One side of the high-pressure pump is connected with an input pipeline, the other side of the high-pressure pump is connected with an output pipeline, both the input pipeline and the output pipeline are provided with pressure sensors, and the output pipeline is provided with a flow sensor. The position sensor, the angle sensor, the pressure sensor and the flow sensor are all electrically connected with the controller. The high-pressure common rail injection measuring system with the structure can truly simulate the operation of a high-pressure conjugate system, so that data support for verifying an oil path system, a control system and an algorithm is provided, and the flexibility of research and development is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a fuel output device, in particular to a high-pressure common rail injection measurement system. Background Art

[0002] In the high-pressure common rail system, the high-pressure fuel pump pressurizes the low-pressure fuel into high-pressure fuel, which is then stored in the common rail fuel pipe. Finally, the high-pressure fuel waits for the injection command from the electronic control unit to be output, thereby completing the fuel supply.

[0003] The system's oil supply needs to be controlled with high precision and flexibility. Therefore, in the system development phase, the oil system, control system, and algorithm are generally modeled and roughly adjusted before being transferred to the engine bench for testing and calibration, thereby making preparations for engine bench debugging and calibration. However, between the initial system modeling and the transfer to the engine bench for calibration, there is a lack of equipment to verify the oil system, control system, and algorithm, which affects the accuracy of the system due to lack of data association, is not flexible, and prolongs the development cycle. Utility Model Content

[0004] In view of the above shortcomings, the utility model proposes a high-pressure common rail injection measurement system, which can truly simulate the operation of the high-pressure conjugate system, thereby providing data support for verifying the oil circuit system, control system and algorithm, thereby improving the flexibility of research and development.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A high-pressure common rail injection measurement system comprises: a high-pressure pump, a motor and a controller, wherein the output end of the motor is connected to a camshaft, the camshaft cooperates with a plunger of the high-pressure pump, the controller is electrically connected to the high-pressure pump and the motor, the motor is provided with a position sensor, the position sensor is used to detect the starting position of the camshaft movement, an angle sensor is provided at one end of the camshaft away from the motor, an input pipeline is connected to one side of the high-pressure pump, and an output pipeline is connected to the other side of the high-pressure pump, the input pipeline and the output pipeline are both provided with pressure sensors, the output pipeline is provided with a flow sensor, and the position sensor, the angle sensor, the pressure sensor and the flow sensor are all electrically connected to the controller.

[0007] According to the high-pressure common rail injection measurement system of the embodiment of the utility model, at least the following beneficial effects are achieved: when in use, the controller drives the motor to run, and the motor drives the rotation of the camshaft. Since the cam edge of the camshaft is always in contact with the plunger on the high-pressure oil pump, the rotational motion of the camshaft is converted into the linear motion of the plunger, and then the high-pressure pump is driven to supply oil, which is conducive to simulating the crankshaft operation of the existing engine. Among them, the position sensor is used to detect the starting position of the camshaft operation, one of the pressure sensors detects the input pressure of the input pipeline, and the other pressure sensor detects the output pressure of the output pipeline, so as to establish the time relationship between the operation of the camshaft and the output pressure of the output pipeline. In addition, the angle sensor is used to detect the angle of the camshaft, and the flow sensor is used to detect the output flow of the output pipeline, so as to obtain the relationship between the angle of the camshaft and the output flow. Through the above structure, not only the transient pressure and transient flow of the system operation can be obtained, but also the relationship between the camshaft operation and the output pressure and output flow can be obtained, so as to provide data support for verifying the oil circuit system, control system and algorithm in the future, and improve the flexibility of research and development.

[0008] Furthermore, it also includes a mounting shell and a mounting frame that are arranged opposite to each other, the camshaft is arranged on the mounting shell, the angle sensor is arranged on the mounting frame, the angle sensor has a connecting rod, and the connecting rod is coaxially arranged with the camshaft.

[0009] Furthermore, the outer peripheral wall of the camshaft is connected with a detection plate via a bolt, and the position sensor is located at a starting point of the movement of the detection plate.

[0010] Furthermore, the output pipeline is provided with an injector for injecting oil, the controller is electrically connected to the injector, and along the oil conveying direction of the output pipeline, the flow sensor is located in front of the injector.

[0011] Furthermore, along the oil delivery direction of the output pipeline, the output pipeline is provided with a throttle valve located in front of the flow sensor, and the controller is electrically connected to the throttle valve.

[0012] Furthermore, the input pipeline is connected to a gear pump and an accumulator, the gear pump is used to generate a low-pressure output, the accumulator is used to temporarily store part of the oil, and the controller is electrically connected to the gear pump and the accumulator.

[0013] Furthermore, the output pipeline is provided with a return pipeline communicated with the energy accumulator, the return pipeline is connected with a one-way valve and a pressure relief valve, and the controller is electrically connected to the pressure relief valve.

[0014] Furthermore, the return pipeline is connected to a bifurcated pipeline, and the bifurcated pipeline is sequentially connected to a reversing valve and an oil return tank.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a high-pressure common rail injection measurement system of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the assembly of the motor, camshaft and high-pressure pump;

[0019] Figure 3 for Figure 2 Internal cross-sectional view of .

[0020] In the figure: high-pressure pump 100, plunger 101, input pipeline 110, output pipeline 120, flow sensor 130, injector 140, accumulator 150, motor 200, mounting shell 201, mounting frame 202, coupling 203, detection frame 204, camshaft 210, detection plate 211, position sensor 220, angle sensor 230, connecting rod 231, controller 300, pressure sensor 400. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0023] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If the terms "first" or "second" are described, they are only used for descriptive purposes and cannot be understood to indicate or imply relative importance.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figures 1 to 3 A high-pressure common rail injection measurement system includes: a high-pressure pump 100, a motor 200 and a controller 300. The output end of the motor 200 is connected to a camshaft 210, and the camshaft 210 cooperates with a plunger of the high-pressure pump 100. The controller 300 is electrically connected to the high-pressure pump 100 and the motor 200. The motor 200 is provided with a position sensor 220, and the position sensor 220 is used to detect the starting position of the movement of the camshaft 210. An angle sensor 230 is provided at one end of the camshaft 210 away from the motor 200. An input pipeline 110 is connected to one side of the high-pressure pump 100, and an output pipeline 120 is connected to the other side of the high-pressure pump 100. The input pipeline 110 and the output pipeline 120 are both provided with a pressure sensor 400, and the output pipeline 120 is provided with a flow sensor 130. The position sensor 220, the angle sensor 230, the pressure sensor 400 and the flow sensor 130 are all electrically connected to the controller 300.

[0026] The high-pressure common rail injection measurement system of the above structure, when in use, the controller 300 drives the motor 200 to operate, and the motor 200 drives the rotation of the camshaft 210. Since the cam edge of the camshaft 210 is always in contact with the plunger 101 on the high-pressure oil pump, the rotational motion of the camshaft 210 is converted into the linear motion of the plunger 101, and then the high-pressure pump 100 is driven to supply oil, which is conducive to simulating the crankshaft operation of the existing engine. Among them, the position sensor 220 is used to detect the starting position of the camshaft 210 operation, one of the pressure sensors 400 detects the input pressure of the input pipeline 110, and the other pressure sensor 400 detects the output pressure of the output pipeline 120, so as to establish the time relationship between the operation of the camshaft 210 and the output pressure of the output pipeline 120. In addition, the angle sensor 230 is used to detect the angle of the camshaft 210, and the flow sensor 130 is used to detect the output flow of the output pipeline 120, so as to obtain the relationship between the angle of the camshaft 210 and the output flow. Through the above structure, not only the transient pressure and transient flow of the system operation can be obtained, but also the relationship between the operation of the camshaft 210 and the output pressure and output flow can be obtained, which is conducive to providing data support for the subsequent verification of the oil circuit system, control system and algorithm, and improves the flexibility of research and development.

[0027] See also Figures 1 to 3 , further, it also includes a mounting shell 201 and a mounting frame 202 that are arranged oppositely, the camshaft 210 is arranged on the mounting shell 201, the angle sensor 230 is arranged on the mounting frame 202, and the angle sensor 230 has a connecting rod 231, and the connecting rod 231 is coaxially arranged with the camshaft 210, so as to facilitate the installation of the angle sensor 230. It can be understood that the output end of the motor 200 is connected to the camshaft 210 through the coupling 203, the mounting shell 201 is provided with a first mounting hole for placing the camshaft 210, and the mounting frame 202 is provided with a second mounting hole for placing the angle sensor 230, and the first mounting hole and the second mounting hole are located on the same axis, so as to facilitate the coaxial arrangement of the camshaft 210 and the angle sensor 230.

[0028] See also Figures 1 to 3 Further, the outer peripheral wall of the camshaft 210 is connected with a detection plate 211 by a bolt, and the position sensor 220 is located at the starting point of the movement of the detection plate 211. Specifically, the motor 200 also includes a detection frame 204, and the position sensor 220 is installed on the detection frame 204 by bolts, so as to facilitate the installation of the position sensor 220. It can be understood that the position sensor 220 can adopt an existing proximity switch or a photoelectric sensor, which will not be described in detail.

[0029] See also Figure 1Furthermore, the output pipeline 120 is provided with an injector 140 for injecting oil, the controller 300 is electrically connected to the injector 140, and the flow sensor 130 is located in front of the injector 140 along the oil delivery direction of the output pipeline 120. Specifically, the injector 140 injects oil within the set injection time, and the oil is measured by the flow sensor 130, so as to obtain the real injection amount of the output pipeline 120, which is conducive to the later calculation of the injection amount of the injector 140 per unit time.

[0030] See also Figure 1 Furthermore, along the oil delivery direction of the output pipeline 120, the output pipeline 120 is provided with a throttle valve located in front of the flow sensor 130, and the controller 300 is electrically connected to the throttle valve, thereby changing the output amount of the oil in the output pipeline 120 through the throttle valve.

[0031] See also Figure 1 , further, the input pipeline 110 is connected with a gear pump and an accumulator 150, the gear pump is used to generate a low-pressure output, the accumulator 150 is used to temporarily store part of the oil, and the controller 300 is electrically connected to the gear pump and the accumulator 150. Specifically, when in use, the oil generates a low-pressure output through the gear pump, and the high-pressure pump 100 can pressurize the low-pressure output to generate a high-pressure output. It is understandable that the controller 300 sets the target pressure values ​​of the low-pressure output and the high-pressure output respectively, and then uses the pressure sensor 400 located in the input pipeline 110 to detect the actual pressure value of the low-pressure output, so as to feed back the signal to the controller 300, so that the controller 300 can calculate the speed of the gear pump through a closed-loop control algorithm, and then control the operation of the gear pump so that the actual pressure value of the low-pressure output reaches the target pressure value, and finally enables the gear pump to generate a stable and accurate low-pressure power source. Similarly, the pressure sensor 400 located in the output pipeline 120 detects the actual pressure value of the high-pressure output, and feeds back the signal to the controller 300, so that the controller 300 can use the accumulator 150 to correct the low-pressure output, and finally drive the high-pressure output to reach the corresponding target pressure value, so that the device has the function of adjustable output pressure, high accuracy and good stability, thereby providing the injector with a stable output source with sufficient flow, so as to achieve the effect of constant pressure output.

[0032] Furthermore, the output pipeline 120 is provided with a return pipeline connected to the accumulator 150, the return pipeline is connected with a one-way valve and a pressure relief valve, and the controller 300 is electrically connected to the pressure relief valve. Specifically, according to the pressure value detected by the pressure sensor 400 of the output pipeline 120, the controller 300 controls the pressure relief valve to open the return pipeline for constant pressure output. When the detected pressure exceeds the set pressure, the pressure relief valve is opened to unload the pressure; and when the detected pressure is less than or equal to the set value, the pressure relief valve is closed, so that the accumulator 150 is replenished through the return pipeline. It can be understood that the one-way valve is used to prevent the oil in the output pipeline 120 from flowing back into the accumulator 150, so that the accumulator 150 can better replenish the output.

[0033] Furthermore, the return pipeline is connected to a bifurcated pipeline, and the bifurcated pipeline is connected to a reversing valve and an oil return tank in sequence, so that part of the oil can flow into the oil return tank through the branch pipeline.

[0034] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A high pressure common rail injection measurement system, characterized in that: include: A high-pressure pump (100), a motor (200) and a controller (300), wherein the output end of the motor (200) is connected to a camshaft (210), the camshaft (210) cooperates with a plunger (101) of the high-pressure pump (100), the controller (300) is electrically connected to the high-pressure pump (100) and the motor (200), the motor (200) is provided with a position sensor (220), the position sensor (220) is used to detect the starting position of the movement of the camshaft (210), and the camshaft (210) is away from the motor (200). An angle sensor (230) is provided at one end, an input pipeline (110) is connected to one side of the high-pressure pump (100), and an output pipeline (120) is connected to the other side of the high-pressure pump (100), the input pipeline (110) and the output pipeline (120) are both provided with a pressure sensor (400), the output pipeline (120) is provided with a flow sensor (130), and the position sensor (220), the angle sensor (230), the pressure sensor (400) and the flow sensor (130) are all electrically connected to the controller (300).

2. A high pressure common rail injection measurement system according to claim 1, characterized in that: It also includes a mounting shell (201) and a mounting frame (202) that are arranged opposite to each other, the camshaft (210) is arranged on the mounting shell (201), the angle sensor (230) is arranged on the mounting frame (202), and the angle sensor (230) has a connecting rod (231), and the connecting rod (231) is coaxially arranged with the camshaft (210).

3. A high pressure common rail injection measurement system according to claim 1, characterized in that: The outer peripheral wall of the camshaft (210) is connected to a detection plate (211) via a bolt member, and the position sensor is located at a starting point of movement of the detection plate (211).

4. A high pressure common rail injection measurement system according to claim 1, characterized in that: The output pipeline (120) is provided with an injector (140) for injecting oil, the controller (300) is electrically connected to the injector (140), and the flow sensor (130) is located in front of the injector (140) in the oil conveying direction along the output pipeline (120).

5. A high pressure common rail injection measurement system according to claim 4, characterized in that: Along the oil delivery direction of the output pipeline (120), the output pipeline (120) is provided with a throttle valve located in front of the flow sensor (130), and the controller (300) is electrically connected to the throttle valve.

6. A high pressure common rail injection measurement system according to claim 1, characterized in that: The input pipeline (110) is connected to a gear pump and an accumulator (150), the gear pump is used to generate a low-pressure output, the accumulator (150) is used to temporarily store part of the oil, and the controller (300) is electrically connected to the gear pump and the accumulator (150).

7. A high pressure common rail injection measurement system according to claim 6, characterized in that: The output pipeline (120) is provided with a return pipeline in communication with the energy storage device (150), the return pipeline is connected to a one-way valve and a pressure relief valve, and the controller (300) is electrically connected to the pressure relief valve.

8. A high pressure common rail injection measurement system according to claim 7, characterized in that: The return pipeline is connected to a bifurcated pipeline, and the bifurcated pipeline is sequentially connected to a reversing valve and an oil return tank.

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