A performance detection system for a mechanical fuel injection device

Abstract

The present application relates to a kind of mechanical oil injection device performance detection system, including fuel tank, hydraulic oil tank, fuel pressurizing assembly, oil injection pressure regulating assembly and detection monitoring component, wherein fuel pressurizing assembly further includes plunger pump, loading liquid cylinder and hydraulic drive component, loading liquid cylinder is connected and is used to drive plunger in plunger pump, oil injection pressure regulating assembly includes clamping liquid cylinder and hydraulic regulating component, wherein clamping liquid cylinder is used to connect the pressure regulating part of target oil injection device, detection component includes multiple sensors, acquisition module and control module, and the detection of mechanical oil injection device performance is realized.Compared with prior art, the present application replaces traditional camshaft by loading liquid cylinder to drive plunger pump to work, and at the same time, replaces artificial pressure regulating part adjustment by clamping liquid cylinder to realize the pressure regulation of target oil injection device, so that fuel oil supply and oil injector pressure regulating during oil injector detection process are concentratedly controlled, so that detection operation is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel injection device detection, and particularly relates to a mechanical fuel injection device performance detection system. BACKGROUND

[0002] In a diesel engine, a fuel injection system is a fuel supply device that injects a certain amount of fuel in an atomized state into a combustion chamber to mix with air. The key component of the system is a fuel injector, which functions to atomize diesel oil at a certain pressure into fine and uniform oil particles and to mix the diesel oil with air in the combustion chamber. The parameters and characteristics of the fuel injector determine the atomization characteristics of the fuel, affect the formation of the in-cylinder mixture, and further affect the diesel combustion process. Therefore, the characteristics of the fuel injector are very important to the economy, power, emission, and reliability of the diesel engine. As a precision component with high machining precision, the fuel injector needs to be checked and replaced in time due to needle valve and valve seat wear, spring damage, and the like, which reduces the start injection pressure and reliability, deteriorates the sealing performance, and changes the spray performance.

[0003] At present, the experimental table for detecting the performance of the fuel injector can be divided into a manual experimental table and an electric experimental table according to the difference in the high-pressure fuel pressure source. The manual experimental table needs to manually operate a pressure pump to provide high-pressure fuel, the fuel supply speed of the experimental table is uneven, the workload of the staff is increased, and the state of the fuel injector cannot be accurately analyzed and judged. The fuel supply speed of the electric experimental table is constant, the workload of the staff is reduced, but a large power motor is used to drive the plunger pump, the working environment is poor, and the state of the fuel injector is also not conducive to judgment. On the other hand, the fuel injection pressure of the fuel injector to be detected also needs to be manually adjusted, which is extremely tedious, especially for the detection of mechanical fuel injectors (i.e., mechanical fuel injection devices).

[0004] Therefore, people urgently need a solution that can centrally control the fuel supply and fuel injector pressure adjustment operations in the fuel injector detection process. SUMMARY

[0005] Therefore, it is necessary to provide a mechanical fuel injection device performance detection system to realize how to centrally control the fuel supply and fuel injector pressure adjustment operations in the fuel injector detection process.

[0006] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0007] The present application provides a mechanical fuel injection device performance detection system for detecting a target fuel injection device, the target fuel injection device comprising a pressure adjusting part, comprising:

[0008] a fuel tank and a hydraulic oil tank;

[0009] The fuel pressurizing assembly comprises a plunger pump, a loading cylinder and a hydraulic drive assembly, the plunger pump comprises a plunger, an oil inlet of the plunger pump is communicated with the fuel tank, an oil outlet of the plunger pump is communicated with the target fuel injection device, an output end of the loading cylinder is drivingly connected with the plunger, the loading cylinder is hydraulically connected with the hydraulic drive assembly, and the hydraulic drive assembly is hydraulically connected with the hydraulic oil tank.

[0010] The fuel pressurizing assembly comprises a plunger pump, a loading cylinder and a hydraulic drive assembly, the plunger pump comprises a plunger, an oil inlet of the plunger pump is communicated with the fuel tank, an oil outlet of the plunger pump is communicated with the target fuel injection device, an output end of the loading cylinder is drivingly connected with the plunger, the loading cylinder is hydraulically connected with the hydraulic drive assembly, and the hydraulic drive assembly is hydraulically connected with the hydraulic oil tank.

[0011] The detection monitoring assembly comprises a sensor group, an acquisition module and a control module, a plurality of sensors in the sensor group are respectively arranged in the fuel tank, the hydraulic oil tank, the hydraulic drive assembly and the hydraulic regulating assembly, the acquisition module is electrically connected with the plurality of sensor groups and the control module, and the control module is electrically connected with the hydraulic regulating assembly and the hydraulic drive assembly.

[0012] Further, the plunger pump further comprises a pump body, the plunger is slidingly arranged in the pump body, a sliding direction of the plunger is parallel to an extension axis of the plunger, the loading cylinder is a telescopic cylinder, an output end of the loading cylinder is connected to one end of the plunger away from the oil outlet of the plunger pump, and a telescopic direction of the output end of the loading cylinder is the same as the sliding direction of the plunger.

[0013] Further, the target fuel injection device further comprises an outer shell, the pressure regulating part is slidingly inserted into the outer shell, the clamping cylinder is a telescopic cylinder, an output end of the clamping cylinder is connected to one end of the pressure regulating part away from the outer shell, and a telescopic direction of the output end of the clamping cylinder is the same as a sliding direction of the pressure regulating part.

[0014] Further, the hydraulic drive assembly comprises a hydraulic oil circulating pump, a first reversing valve, an overflow valve and a first cooling device, an oil inlet of the hydraulic oil circulating pump is communicated with the hydraulic oil tank, an oil outlet of the hydraulic oil circulating pump is communicated with the first reversing valve, the oil outlet of the hydraulic oil circulating pump is also communicated with the overflow valve, the first reversing valve is also communicated with the loading cylinder, and the first cooling device is connected with the hydraulic oil tank.

[0015] Further, the hydraulic regulating assembly comprises a second reversing valve, the second reversing valve is communicated with the hydraulic oil tank and the clamping cylinder.

[0016] Further, the fuel pressurizing assembly further comprises a spraying pipeline assembly, the spraying pipeline assembly comprising a pressure relief valve, a first spraying pipeline valve, a pressure stabilizing device and a second spraying pipeline valve, one end of the pressure relief valve being communicated with the oil outlet of the plunger pump and one end of the first spraying pipeline valve, the other end of the pressure relief valve being communicated with the hydraulic oil tank; the other end of the first spraying pipeline valve being communicated with the oil inlet of the pressure stabilizing device; the oil outlet of the pressure stabilizing device being communicated with one end of the second spraying pipeline valve; the other end of the second spraying pipeline valve being communicated with the target fuel injection device.

[0017] Further, the fuel pressurizing assembly further comprises a sealing pipeline assembly, the sealing pipeline assembly comprising a first sealing pipeline valve and a second sealing pipeline valve, one end of the first sealing pipeline valve being communicated with the oil outlet of the plunger pump, the other end of the first sealing pipeline valve being communicated with the second sealing pipeline valve, the other end of the second sealing pipeline valve being communicated with the target fuel injection device.

[0018] Further, the fuel pressurizing assembly further comprises a fuel supply pipeline assembly, the fuel supply pipeline assembly comprising a fuel circulating oil pump, a fuel return tank and a second cooling device, the oil outlet of the fuel circulating oil pump being communicated with the plunger pump, the oil inlet of the fuel circulating oil pump being communicated with the fuel tank, the fuel tank being communicated with the fuel return tank, the fuel return tank being communicated with the plunger pump, the second cooling device being communicated with the fuel tank.

[0019] Further, the sensor group comprises a fuel temperature sensor, a fuel pressure sensor, a hydraulic oil temperature sensor, a clamping pressure sensor, a spraying pressure sensor and a sealing pressure sensor, the fuel temperature sensor being arranged in the fuel tank, the fuel pressure sensor being arranged on the hydraulic pipeline between the fuel circulating pump and the plunger pump, the hydraulic oil temperature sensor being arranged in the hydraulic oil tank, the clamping pressure sensor being arranged on the hydraulic pipeline between the hydraulic oil circulating oil pump and the first reversing valve, the spraying pressure sensor being arranged on the hydraulic pipeline between the pressure stabilizing device and the second spraying pipeline valve, the sealing pressure sensor being arranged on the hydraulic pipeline between the first sealing pipeline valve and the second sealing pipeline valve.

[0020] Further, the detection and monitoring assembly further comprises a control console, the control console being electrically connected with the control module.

[0021] The application provides a mechanical fuel injection device performance detection system, which comprises a fuel tank, a hydraulic oil tank, a fuel pressurizing assembly, a fuel injection pressure regulating assembly and a detection monitoring assembly, wherein the fuel pressurizing assembly further comprises a plunger pump, a loading liquid cylinder and a hydraulic drive assembly, the loading liquid cylinder is connected to the plunger pump and is used to drive the plunger in the plunger pump to supply fuel to a target fuel injection device, the fuel injection pressure regulating assembly comprises a clamping liquid cylinder and a hydraulic regulating assembly, wherein the clamping liquid cylinder is used to connect a pressure regulating part of the target fuel injection device and is used to drive the pressure regulating part to regulate the pressure of the target fuel injection device, and the detection assembly comprises a plurality of sensors, an acquisition module and a control module, data collected by the plurality of sensors is sent to the acquisition module, and the control module electrically connected to the acquisition module is used for control, so that the performance of the mechanical fuel injection device is detected. Compared with the prior art, the loading liquid cylinder is used to replace the traditional camshaft to drive the plunger pump to work, and the clamping liquid cylinder is used to replace manual adjustment of the pressure regulating part, so that the pressure of the target fuel injection device is regulated, and the fuel supply and the pressure regulation of the fuel injector during the detection process are concentrated and controlled, so that the detection operation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A system architecture diagram of an embodiment of the mechanical fuel injection device performance detection system provided by the application;

[0023] Figure 2 A hydraulic connection diagram of an embodiment of the mechanical fuel injection device performance detection system provided by the application;

[0024] Figure 3 A system architecture diagram of the fuel pressurizing assembly in an embodiment of the mechanical fuel injection device performance detection system provided by the application;

[0025] Figure 4 A system architecture diagram of the detection monitoring assembly in an embodiment of the mechanical fuel injection device performance detection system provided by the application. DETAILED DESCRIPTION

[0026] The preferred embodiments of the application are specifically described below with reference to the drawings, wherein the drawings form a part of the application and are used to explain the principles of the embodiments of the application, but are not used to limit the scope of the application.

[0027] In the description of the application, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly and specifically limited.

[0028] Reference to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common set of embodiments. It is expressly understood that the embodiments described herein can be combined with each other in their various permutations and combinations.

[0029] In conjunction with Figures 1 to 4 As shown in the drawings, the present application provides an embodiment of a mechanical fuel injection device performance detection system for detecting a target fuel injection device, wherein the target fuel injection device comprises a pressure regulating part, and the mechanical fuel injection device performance detection system in the embodiment comprises a fuel tank 1, a hydraulic oil tank 2, a fuel pressurizing assembly 3, a fuel injection pressure regulating assembly 4, and a monitoring and control assembly 5. The fuel pressurizing assembly 3 further comprises a plunger pump 31, a loading cylinder 32, and a hydraulic drive assembly 33. The plunger pump 31 comprises a plunger. An oil inlet of the plunger pump 31 is connected to the fuel tank 1. An oil outlet of the plunger pump 31 is connected to the target fuel injection device. An output end of the loading cylinder 32 is drivingly connected to the plunger. The loading cylinder 32 is hydraulically connected to the hydraulic drive assembly 33. The hydraulic drive assembly 33 is hydraulically connected to the hydraulic oil tank 2. The fuel injection pressure regulating assembly 4 comprises a clamping cylinder 41 and a hydraulic regulating assembly 42. An output end of the clamping cylinder 41 is drivingly connected to the pressure regulating part of the target fuel injection device. The clamping cylinder 41 is hydraulically connected to the hydraulic regulating assembly 42. The hydraulic regulating assembly 42 is hydraulically connected to the hydraulic oil tank 2. The monitoring and control assembly 5 comprises a sensor group 51, an acquisition module 52, and a control module 53. Multiple sensors in the sensor group 51 are respectively arranged in the fuel tank 1, the hydraulic oil tank 2, the hydraulic drive assembly 33, and the hydraulic regulating assembly 42. The acquisition module 52 is electrically connected to the sensor group 51 and the control module 53. The control module 53 is electrically connected to the hydraulic regulating assembly 42 and the hydraulic drive assembly 33.

[0030] The application provides a mechanical fuel injection device performance detection system, which comprises a fuel tank 1, a hydraulic oil tank 2, a fuel pressurizing assembly 3, a fuel injection pressure regulating assembly 4 and a monitoring and control assembly 5, wherein the fuel pressurizing assembly 3 further comprises a plunger pump 31, a loading liquid cylinder 32 and a hydraulic drive assembly 33, the loading liquid cylinder 32 is connected to and used for driving a plunger in the plunger pump 31, fuel is supplied to a target fuel injection device, the fuel injection pressure regulating assembly 4 comprises a clamping liquid cylinder 41 and a hydraulic regulating assembly 42, wherein the clamping liquid cylinder 41 is used for connecting a pressure regulating part of the target fuel injection device and driving the pressure regulating part to regulate the pressure of the target fuel injection device, the detection assembly comprises a plurality of sensors, an acquisition module 52 and a control module 53, data collected by the plurality of sensors is sent to the acquisition module 52, and the control module 53 electrically connected to the acquisition module 52 is controlled, so that the performance of the mechanical fuel injection device is detected. Compared with the prior art, the loading liquid cylinder 32 is used to replace the traditional camshaft to drive the plunger pump 31 to work, and the clamping liquid cylinder 41 is used to replace manual adjustment of the pressure regulating part, so that the pressure of the target fuel injection device is regulated, and thus the fuel supply and pressure regulation of the fuel injector during the detection process are concentrated and controlled, and the detection operation is more convenient.

[0031] Specifically, in a preferred embodiment, the plunger pump 31 further comprises a pump body, the plunger is slidingly arranged in the pump body, the sliding direction of the plunger is parallel to the extension axis of the plunger, the loading liquid cylinder 32 is a telescopic oil cylinder, the output end of the loading liquid cylinder 32 is connected to one end of the plunger away from the oil outlet of the plunger pump 31, and the telescopic direction of the output end of the loading liquid cylinder 32 is the same as the sliding direction of the plunger.

[0032] The plunger pump is a hydraulic pump that uses a plunger to transfer pressure and control flow. The main structure of the existing plunger pump mainly includes the following parts:

[0033] Pump body: composed of an oil inlet, an oil outlet and a pressure regulating hole, etc., used to accommodate the plunger and the one-way valve.

[0034] Plunger: a cylindrical piston that can move back and forth in the pump body to generate pressure.

[0035] Connecting rod: as the plunger needs to move back and forth, it needs to be connected to the crankshaft and located at the top of the plunger.

[0036] One-way valve: prevents backflow, ensuring that liquid can only flow from the oil inlet, and also serves as an exhaust port.

[0037] Crankshaft: converts rotational motion into reciprocating motion, allowing the plunger to move back and forth.

[0038] The working principle of the plunger pump is that as the crankshaft rotates, the plunger moves back and forth in the pump body, connecting the oil inlet and outlet at certain positions to allow the liquid to be sucked into the pump body from the oil inlet, and then when the plunger continues to move, the liquid is squeezed out of the pump body and output to the pipeline or hydraulic system. The pressure depends on the diameter and stroke of the plunger, while the flow rate is determined by the speed of the pump per minute. By controlling the speed of the reciprocating motion of the plunger, the flow rate and pressure of the pump can be adjusted to control the hydraulic system.

[0039] In this embodiment, the plunger pump is improved by replacing the original crankshaft mechanism with a hydraulic drive loading cylinder 32 to realize the reciprocating motion of the plunger pump, thereby supplying hydraulic oil to the target oil injection device. The oil supply is stable, the working environment is improved, and centralized control is achieved without the need for additional electronic control systems, simplifying the system structure.

[0040] It can be understood that other structures in the plunger and related connection methods are prior art, and therefore this document will not be described in detail.

[0041] In combination with Figure 2 In a preferred embodiment, the hydraulic drive assembly 33 includes a hydraulic oil circulating pump 331, a first reversing valve 332, an overflow valve 333, and a first cooling device 334. The oil inlet of the hydraulic oil circulating pump 331 is connected to the hydraulic oil tank 2, the oil outlet of the hydraulic oil circulating pump 331 is connected to the first reversing valve 332, the oil outlet of the hydraulic oil circulating pump 331 is also connected to the overflow valve 333, and the first reversing valve 332 is also connected to the loading cylinder 32. The first cooling device 334 is connected to the hydraulic oil tank 2.

[0042] The first cooling device 334 is used to cool the hydraulic oil tank 2. The first cooling device 334 can be implemented using any existing cooling device. In this embodiment, the first cooling device 334 includes a hydraulic oil return tank 362, which pumps hot oil out to a heat exchange pipeline through an oil pump, and exchanges heat with another side circulating cooling water (composed of a cooling water tank, a water pump, and a heat exchange pipeline) to achieve cooling.

[0043] In combination with Figure 3As shown, in a preferred embodiment, the fuel pressurizing assembly 3 further comprises a spray pipeline assembly 34, which comprises a pressure relief valve 341, a first spray pipeline valve 342, a pressure stabilizing device 343 and a second spray pipeline valve 344. One end of the pressure relief valve 341 is connected to the oil outlet of the plunger pump 31 and one end of the first spray pipeline valve 342, and the other end of the pressure relief valve 341 is connected to the hydraulic oil tank 2. The other end of the first spray pipeline valve 342 is connected to the oil inlet of the pressure stabilizing device 343. The oil outlet of the pressure stabilizing device 343 is connected to one end of the second spray pipeline valve 344. The other end of the second spray pipeline valve 344 is connected to the target fuel injection device. The spray pipeline assembly 34 is mainly used for fuel supply for spray experiment of the target fuel injection device.

[0044] Further, in a preferred embodiment, the fuel pressurizing assembly 3 further comprises a sealing pipeline assembly 35, which comprises a first sealing pipeline valve 351 and a second sealing pipeline valve 352. One end of the first sealing pipeline valve 351 is connected to the oil outlet of the plunger pump 31, and the other end of the first sealing pipeline valve 351 is connected to the second sealing pipeline valve 352. The other end of the second sealing pipeline valve 352 is connected to the target fuel injection device. The sealing pipeline assembly 35 is mainly used for fuel supply for sealing experiment of the target fuel injection device.

[0045] Due to different experimental requirements, two high-pressure pipelines are provided in the embodiment, i.e. the spray pipeline assembly 34 for spray experiment and the sealing pipeline assembly 35 for sealing experiment, so as to make the experiments not affect each other.

[0046] In a preferred embodiment, the fuel pressurizing assembly 3 further comprises a fuel supply pipeline assembly 36, which comprises a fuel circulating oil pump 361, a fuel return tank 362 and a second cooling device 363. The oil outlet of the fuel circulating oil pump 361 is connected to the plunger pump 31. The oil inlet of the fuel circulating oil pump 361 is connected to the fuel tank 1. The fuel tank 1 is connected to the fuel return tank 362. The fuel return tank 362 is connected to the plunger pump 31. The second cooling device 363 is connected to the fuel tank 1. The fuel supply pipeline assembly 36 is mainly used for fuel supply for the plunger pump 31. The structure principle of the second cooling device 363 is similar to that of the first cooling device 334. Those skilled in the art can think of a cooling mode and understand the illustration in the drawing, and thus the description is not repeated here.

[0047] It can be understood that the spray pipeline assembly 34, the sealing pipeline assembly 35 and the fuel supply pipeline assembly 36 realize fuel connection among the fuel tank 1, the plunger pump 31 and the target fuel injection device. In practice, other existing connection modes can also be used.

[0048] Further, in a preferred embodiment, the fuel pressurizing assembly 3 further comprises an oil mist collector for collecting oil mist sprayed by the target fuel injection device.

[0049] In a preferred embodiment, the target fuel injection device further comprises an outer housing, the pressure adjusting part is slidingly inserted into the outer housing, the clamping hydraulic cylinder 41 is a telescopic hydraulic cylinder, and the output end of the clamping hydraulic cylinder 41 is connected to one end of the pressure adjusting part away from the outer housing, and the telescopic direction of the output end of the clamping hydraulic cylinder 41 is the same as the sliding direction of the pressure adjusting part.

[0050] The pressure of the mechanical fuel injector is achieved by adjusting the internal structure of the fuel injection pump. The fuel injection pump is usually composed of an adjusting screw, an adjusting spring and an adjusting column. These components work together to control the pressure and fuel injection amount of the fuel injection pump. The adjusting screw is generally located at the top of the fuel injection pump, and the pressure is adjusted by rotating the screw. The adjusting spring is located below the adjusting screw and is used to control the size of the pressure. The adjusting column connects the adjusting screw and the adjusting spring and is used to adjust the range of the pressure. By adjusting the position and tension of these components, the pressure and fuel injection amount of the fuel injection pump can be adjusted to meet the requirements of the engine, wherein the pressure adjusting screw can be equivalent to a telescopic part driven by threads (i.e. the pressure adjusting part).

[0051] In the present embodiment, the pressure adjusting part of the target fuel injection device can be a telescopic rod, etc., which replaces the threads of the pressure adjusting screw through the cooperation of the screw rod of the clamping hydraulic cylinder 41 and the clamp, so that the pressure adjusting part telescopes, and the pressure adjusting spring is fixed, so that the fuel injection device has different starting pressures under different clamping pressures. If the parts of the fuel injection device are worn out, it is also convenient to replace the parts of the fuel injection device.

[0052] It can be understood that other structures in the target fuel injection device are prior art, and therefore will not be described in detail herein.

[0053] Further, in a preferred embodiment, the hydraulic pressure adjusting assembly 42 comprises a second reversing valve, which communicates the hydraulic oil tank 2 and the clamping hydraulic cylinder 41. Through the second reversing valve, the telescoping of the clamping hydraulic cylinder 41 is achieved.

[0054] Please refer to Figure 2In a preferred embodiment, the sensor group 51 comprises a fuel temperature sensor 511 arranged in the fuel tank 1, a fuel pressure sensor 512 arranged on a hydraulic line between the fuel circulating pump and the plunger pump 31, a hydraulic oil temperature sensor 513 arranged in the hydraulic oil tank 2, a clamping pressure sensor 514 arranged on a hydraulic line between the hydraulic oil circulating oil pump 331 and the first reversing valve 332, a spray pressure sensor 515 arranged on a hydraulic line between the pressure stabilizing device 343 and the second spray line valve 344, and a sealing pressure sensor 516 arranged on a hydraulic line between the first sealing line valve 351 and the second sealing line valve 352.

[0055] Please refer to Figure 4 In a preferred embodiment, the acquisition module 52 is an acquisition card, the control module 53 comprises a PLC module and an upper computer, and the monitoring and control assembly 5 further comprises a control console electrically connected to the control module 53. The control console is used for manual control of the system.

[0056] The application further provides a more detailed embodiment for more clearly illustrating the mechanical oil injection device performance detection system.

[0057] In the embodiment, the functions of the monitoring and control assembly 5 include the following aspects:

[0058] (1) The upper computer (i.e., the control module 53) establishes communication with the PLC S7-1200 based on the Siemens TCP / IP Ethernet of the NI OPC Servers.

[0059] (2) The PLC (i.e., the control module 53) receives digital signals sent by the control console buttons and outputs digital signals to control the start-stop or opening-closing of the hydraulic system elements, including the loading cylinder 32, the fuel cooling water pump, the hydraulic oil circulating oil pump 331, etc.

[0060] (3) The upper computer based on Labview can display the received data in real time, some important data can be displayed in waveform, and the relevant data can be recorded in a TDMS format file, with the functions of historical data query and playback. The acquisition data include fuel supply pressure, fuel temperature, hydraulic oil temperature, spraying pressure, sealing pressure, clamping pressure, and the numerical values are displayed. The waveform graphs include a spray experiment pressure waveform graph, an enabling spraying pressure waveform graph, and a sealing pressure waveform graph. The enabling spraying pressure value and sealing time value files are formed.

[0061] PLC module design:

[0062] The function realized by the PLC program is to receive the signal of the console button, to control the start-stop or opening-closing of the program control element according to the program, and to control the objects including the loading cylinder 32, the fuel cooling water pump (i.e. the second cooling device 363), the hydraulic oil circulating pump 331, the fuel circulating oil pump 361, the first cooling device 334, and all the valves.

[0063] Selection: The hardware selects Siemens S7-1200 CPU1214C, 14-point digital quantity input, 10-point digital quantity output, 2-point analog quantity input, and the expansion module selects SB 1221 digital quantity signal board, which has 4-way digital quantity signal input ports and meets the requirements of the test bench.

[0064] The software adopts the modular programming mode for program design, and the main program realizes the integration of functions by calling subprograms. The modules in the software include:

[0065] 1. Communication module: the communication between the PLC and the upper computer is based on TCP. In the experimental process, the PLC receives the signal from the upper computer, so as to achieve the execution and interruption of the program. Specifically, when the upper computer detects that the pipeline pressure value reaches 100 MPa, it sends a signal to the PLC, and the intermediate judgment quantity "pressure reaches 100 MPa" set in the PLC program changes from 0 to 1, then the experimental program is interrupted. During the sealing experiment, when the pressure value reaches P3, a signal is sent to the PLC, and the intermediate judgment quantity "pressure value reaches P3" set in the PLC program changes from 0 to 1, then the sealing pressure test program is interrupted. When the sealing time test is completed, the upper computer sends a signal to the PLC, and the intermediate judgment quantity "sealing test time is over" set in the PLC program changes from 0 to 1, at this time, the sealing experiment can enter the stop state.

[0066] 2. Spray experiment module: the function realized by this module is to enter the spray mode, select the automatic pressure test, automatic return mode, operate the test start, open the first spray pipeline valve 342 and the second spray pipeline valve 344, close the pressure relief valve 341, and the loading cylinder 32 can continuously rise and pressurize, and return downward, so as to provide continuous high-pressure oil for the target oil injection device, and achieve the experimental purpose of continuous multiple oil injection of the oil injection device.

[0067] 3. Valve opening pressure experiment module: the function realized by this module is to enter the spray mode, select the manual pressure test, manual return mode, operate the test start, open the first spray pipeline valve 342 and the second spray pipeline valve 344, close the pressure relief valve 341, and operate the manual pressure test and manual return, so that the loading cylinder 32 can realize one-time rise and pressurization and return downward, and achieve the purpose of single oil injection of the oil injection device. The input and output diagram is as follows:

[0068] 4. Sealing experiment module: The function of this module is to enter the sealing mode, select the manual pressurization and manual return mode, operate the test start, open the first sealing pipeline valve 351 and the second sealing pipeline valve 352, close the pressure relief valve 341, operate the manual pressurization and manual return, and enable the loading cylinder 32 to realize one-time upward pressurization and downward return, thereby providing high-pressure oil for the oil injection device. When the pressure reaches P3, the PLC receives the signal from the upper computer, and the loading cylinder 32 stops working, and the first sealing pipeline valve 351 is closed. The purpose of single-sealing experiment of the oil injection device is achieved.

[0069] Upper computer design:

[0070] 1. Data acquisition

[0071] Selection of acquisition card (i.e. acquisition module 52): The acquisition card selected is Advantech's PCI-1716, which is a powerful high-resolution multifunctional PCI data acquisition card. It has a 500KS / s 16-bit A / D converter. PCI-1716 can provide 16 single-ended analog input channels or 8 differential analog input channels, or combined input. It has 2 16-bit D / A output channels, 16-bit digital input / output channels, and a 10HMs 16-bit counter channel.

[0072] Data is collected through the analog input channel of the acquisition card. According to the Nyquist theorem, the frequency of the temperature sensor and the fuel pressure and clamping pressure sensor is 100Hz, the set acquisition frequency is 500Hz, the frequency of the start-up pressure and sealing pressure sensor 516 is 500Hz, and the set acquisition frequency is 3kHz. The sampling mode of each channel is continuous sampling, and the sampling number is 500.

[0073] 2. Data display and storage

[0074] The fuel supply pressure, fuel temperature, hydraulic oil temperature, clamping pressure, start-up pressure, and sealing pressure are displayed numerically, and the start-up pressure and sealing pressure are displayed and saved as TDMS files through waveform display, which facilitates subsequent viewing.

[0075] 3. Monitoring and alarm

[0076] If the values of fuel pressure, fuel temperature, hydraulic oil temperature, clamping pressure, start-up pressure, and sealing pressure are greater than the set values, LabVIEW will send an alarm signal to the PLC through TCP communication, thereby achieving parameter monitoring and alarm.

[0077] 4. Peak value acquisition of start-up pressure and sealing time acquisition

[0078] Peak value collection of starting pressure: the program collects the data of starting pressure, and when the waveform is displayed, the peak value of each waveform is found by the peak detection component, and is displayed and saved in the form of an array.

[0079] Sealing time collection: the program first collects the pressure, and then judges whether the highest pressure is reached, if so, it judges whether the opening pressure is reached, if so, it starts to measure. When the target pressure is reached, the test is ended, and the sealing time is obtained.

[0080] 5. Frequency converter speed output

[0081] The frequency converter speed output of the hydraulic pump is output as an analog quantity through the AO channel of the acquisition card, and then the data is processed and converted into a speed value for output.

[0082] When the performance detection system in the mechanical fuel injection device performance detection system in the embodiment is used for performance detection, the experiment involves upper limit pressure P1 of the spray experiment, upper limit pressure P2 of the sealing experiment, and sealing experiment measurement pressures P3 and P4, which are all set values.

[0083] Under the condition of safe power-on of the test bench, the PLC communicates with the upper computer, the hydraulic pump is pre-operated, the frequency converter is started, and the speed is kept at 400 r / min. In the spray mode, the speed is 1800 r / min, and in the sealing mode, the speed is 400 r / min.

[0084] Spray experiment: the PLC selects the spray mode, the upper computer outputs the speed control signal, the frequency converter changes the speed to 1800 r / min, the staff selects the automatic pressure loading mode and the automatic return mode. The operation test is started, the pressure relief valve 341 is closed, the first spray pipeline valve 342 and the second spray pipeline valve 344 are opened, and the loading cylinder 32 is started to work. The fuel enters the fuel injection device after being pressurized, when the fuel pressure in the fuel injection device reaches the starting pressure, the fuel injection device starts to spray, the upper computer records the pressure waveform diagram, and analyzes the peak value to form a table displayed on the PC interface. The loading cylinder 32 automatically pressurizes and returns, and can realize continuous multiple spraying of the fuel injection device. The operation test is stopped, the loading cylinder 32 stops working, the pressure relief valve 341 is opened, and the first spray pipeline valve 342 and the second spray pipeline valve 344 are closed. Exit the spray mode, the upper computer outputs the speed control signal, and the frequency converter changes the speed to 400 r / min.

[0085] Start-up pressure experiment: the PLC is selected to the spraying mode, the host computer outputs the rotating speed control signal, the frequency converter rotating speed is changed to 1800 r / min, the staff selects the manual pressurization mode and the manual return mode. The test is started, the pressure relief valve 341 is closed, the first spraying pipeline valve 342 and the second spraying pipeline valve 344 are opened, the manual pressurization is operated, the loading liquid cylinder 32 piston rod is raised, the manual return is operated, the loading liquid cylinder 32 piston rod is lowered, the fuel is pressurized into the fuel injection device, when the fuel pressure in the fuel injection device reaches the start-up pressure, the fuel injection device starts to spray, the host computer records the pressure waveform diagram, and analyzes the peak value, i.e. the start-up pressure value, to form a table displayed on the PC interface. Since the pressurization and return can be artificially controlled, the fuel injection device can realize single spraying. If the fuel injection device is to be sprayed again, the manual pressurization and the manual return are operated. The test is stopped, the loading liquid cylinder 32 stops working, the pressure relief valve 341 is opened, and the first spraying pipeline valve 342 and the second spraying pipeline valve 344 are closed. The spraying mode is exited, the host computer outputs the rotating speed control signal, and the frequency converter rotating speed is changed to 400 r / min.

[0086] Sealing experiment: the PLC is selected to the sealing mode, the host computer outputs the rotating speed control signal, the frequency converter rotating speed is not changed, and is kept at 400 r / min, the staff selects the manual pressurization mode and the manual return mode. The test is started, the pressure relief valve 341 is closed, the first sealing pipeline valve 351 and the second sealing pipeline valve 352 are opened, the manual pressurization is operated, the loading liquid cylinder 32 piston rod is raised, the manual return is operated, the loading liquid cylinder 32 piston rod is lowered, the fuel is pressurized into the fuel injection device, when the fuel pressure in the fuel injection device reaches P3 (artificially set), the host computer outputs the signal to the PLC to interrupt the pressurization operation. The first sealing pipeline valve 351 is closed. The host computer records the sealing pressure waveform diagram, and records the sealing pressure time from P1-P2 (artificially set), to form a table displayed on the PC interface. The sealing experiment is single, the test is stopped, the pressure relief valve 341 is opened, and the second sealing pipeline valve 352 is closed. The sealing mode is exited, and the sealing experiment is ended. If the sealing experiment is to be performed again, the above operation is repeated.

[0087] Through the cooperation of the monitoring system and the hydraulic system, the spraying experiment, the start-up pressure experiment and the sealing experiment of the fuel injection device are realized. The staff observes the spraying shape during the experiment, the host computer records the spraying pressure waveform diagram, the start-up pressure value, the sealing pressure waveform diagram and the sealing time value, so that the performance of the fuel injection device is detected.

[0088] The application provides a mechanical oil injection device performance detection system, which comprises a fuel tank 1, a hydraulic oil tank 2, a fuel pressurizing assembly 3, an oil injection pressure regulating assembly 4 and a monitoring and control assembly 5, wherein the fuel pressurizing assembly 3 further comprises a plunger pump 31, a loading liquid cylinder 32 and a hydraulic drive assembly 33, the loading liquid cylinder 32 is connected to and used for driving a plunger in the plunger pump 31, and fuel is supplied to a target oil injection device; the oil injection pressure regulating assembly 4 comprises a clamping liquid cylinder 41 and a hydraulic regulating assembly 42, wherein the clamping liquid cylinder 41 is used for connecting a pressure regulating part of the target oil injection device and driving the pressure regulating part to regulate the pressure of the target oil injection device; the detection assembly comprises a plurality of sensors, an acquisition module 52 and a control module 53, data collected by the plurality of sensors is sent to the acquisition module 52, and the control module 53 electrically connected to the acquisition module 52 is controlled, so that the performance of the mechanical oil injection device is detected. Compared with the prior art, the loading liquid cylinder 32 is used to replace a traditional camshaft to drive the plunger pump 31 to work, and the clamping liquid cylinder 41 is used to replace manual adjustment of the pressure regulating part, so that the pressure of the target oil injection device is regulated, and thus the fuel supply and the pressure regulation of the oil injection device during the detection process are centrally controlled, and the detection operation is more convenient.

[0089] The above merely describes the preferred embodiments of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical scope disclosed by the application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the application.

Claims

1. A mechanical fuel injection device performance testing system, used to test a target fuel injection device, the target fuel injection device including a pressure regulating unit, characterized in that, include: Fuel tank and hydraulic oil tank; A fuel pressurization assembly includes a plunger pump, a loading cylinder, and a hydraulic drive assembly. The plunger pump includes a plunger, the inlet of which is connected to the fuel tank, and the outlet of which is connected to the target fuel injection device. The output end of the loading cylinder is drivenly connected to the plunger, the loading cylinder is hydraulically connected to the hydraulic drive assembly, and the hydraulic drive assembly is hydraulically connected to the hydraulic oil tank. The fuel injection pressure regulating assembly includes a clamping cylinder and a hydraulic regulating assembly. The output end of the clamping cylinder is driven to the pressure regulating part of the target fuel injection device. The clamping cylinder is hydraulically connected to the hydraulic regulating assembly, and the hydraulic regulating assembly is hydraulically connected to the hydraulic oil tank. The detection and monitoring component includes a sensor group, a data acquisition module, and a control module. Multiple sensors in the sensor group are respectively installed in the fuel tank, the hydraulic oil tank, the hydraulic drive component, and the hydraulic adjustment component. The data acquisition module is electrically connected to the multiple sensor groups and the control module. The control module is electrically connected to the hydraulic adjustment component and the hydraulic drive component. The hydraulic drive assembly includes a hydraulic oil circulation pump, a first directional valve, a relief valve, and a first cooling device. The inlet of the hydraulic oil circulation pump is connected to the hydraulic oil tank, the outlet of the hydraulic oil circulation pump is connected to the first directional valve, the outlet of the hydraulic oil circulation pump is also connected to the relief valve, and the first directional valve is also connected to the loading cylinder. The first cooling device is connected to the hydraulic oil tank. The hydraulic regulating assembly includes a second reversing valve, which connects the hydraulic oil tank and the clamping cylinder; The fuel pressurization assembly further includes a spray pipeline assembly, which includes a pressure relief valve, a first spray pipeline valve, a pressure stabilizing device, and a second spray pipeline valve. One end of the pressure relief valve is connected to the oil outlet of the plunger pump and one end of the first spray pipeline valve, and the other end of the pressure relief valve is connected to the hydraulic oil tank. The other end of the first spray pipeline valve is connected to the oil inlet of the pressure stabilizing device. The oil outlet of the pressure stabilizing device is connected to one end of the second spray pipeline valve. The other end of the second spray pipeline valve is connected to the target fuel injection device. The fuel pressurization assembly also includes a sealing pipeline assembly, which includes a first sealing pipeline valve and a second sealing pipeline valve. One end of the first sealing pipeline valve is connected to the oil outlet of the plunger pump, and the other end of the first sealing pipeline valve is connected to the second sealing pipeline valve. The other end of the second sealing pipeline valve is connected to the target fuel injection device. The fuel pressurization assembly also includes a fuel supply pipeline assembly, which includes a fuel circulation pump, a return tank, and a second cooling device. The fuel circulation pump outlet is connected to the plunger pump, the fuel circulation pump inlet is connected to the fuel tank, the fuel tank is connected to the return tank, the return tank is connected to the plunger pump, and the second cooling device is connected to the fuel tank. The sensor group includes a fuel temperature sensor, a fuel pressure sensor, a hydraulic oil temperature sensor, a clamping pressure sensor, a spray pressure sensor, and a sealing pressure sensor. The fuel temperature sensor is located in the fuel tank. The fuel pressure sensor is located on the hydraulic line between the fuel circulation pump and the plunger pump. The hydraulic oil temperature sensor is located in the hydraulic oil tank. The clamping pressure sensor is located on the hydraulic line between the hydraulic oil circulation pump and the first directional valve. The spray pressure sensor is located on the hydraulic line between the pressure stabilizing device and the second spray line valve. The sealing pressure sensor is located on the hydraulic line between the first sealing line valve and the second sealing line valve.

2. The mechanical oil injection device performance testing system according to claim 1, characterized in that, The plunger pump also includes a pump body, in which the plunger is slidably disposed. The sliding direction of the plunger is parallel to the extension axis of the plunger. The loading cylinder is a telescopic cylinder. The output end of the loading cylinder is connected to the end of the plunger away from the oil outlet of the plunger pump. The telescopic direction of the output end of the loading cylinder is the same as the sliding direction of the plunger.

3. The mechanical oil injection device performance testing system according to claim 1, characterized in that, The target injection device also includes a housing, the pressure regulating part is slidably inserted into the housing, the clamping cylinder is a telescopic cylinder, the output end of the clamping cylinder is connected to the end of the pressure regulating part away from the housing, and the telescopic direction of the output end of the clamping cylinder is the same as the sliding direction of the pressure regulating part.

4. The mechanical oil injection device performance testing system according to claim 1, characterized in that, The detection and monitoring component also includes a console, which is electrically connected to the control module.

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