A dual valve injector reliability test system

Abstract

The application discloses a double-valve oil injector reliability test system, and belongs to the technical field of monitoring of test systems, and comprises a fuel supply and recovery subsystem, an oil tank, an oil injection part, an oil injector tool and a control unit, the inlet end of the oil injection part is communicated with the oil tank, the outlet end of the oil injection part is communicated with the oil inlet end of the double-valve oil injector through the oil injector tool, the oil injector tool is further used for bearing the oil injector and taking fuel, and the control unit is used for controlling fuel pressure, fuel injection amount and fuel injection frequency; and a monitoring subsystem is used for controlling and monitoring the operation of the fuel supply and recovery module and comprises an image acquisition module, wherein the image acquisition module is used for acquiring spray characteristic images of the double-valve oil injector. The application can timely monitor whether the double-valve oil injector leaks oil.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of monitoring test systems, and particularly relates to a double-valve fuel injector reliability test system. BACKGROUND

[0002] The double-direction control valve fuel injector is mainly matched with an engine for engineering machinery, a marine engine, etc. The product realizes the characteristics of high-pressure injection through low pressure by controlling opening and closing through a double-direction control valve. There are many special performance test devices for the double-direction control valve fuel injector on the market, but there are few test devices for detecting reliability operation and further monitoring reliability detection.

[0003] A Chinese patent application No. CN201810252631.0 relates to a fuel injector reliability detection method and a detection device. The fuel injector reliability detection method comprises the following steps: calculating fuel injection amount of the fuel injector according to ECU; starting a liquid level sensor to detect fuel remaining volume when the fuel injection amount is equal to a fuel consumption calibration value; calculating fuel actual consumption volume according to a difference between the fuel total volume stored in the EEPROM and the fuel remaining volume detected by the liquid level sensor; and comparing the fuel actual consumption volume with the fuel consumption calibration value to determine whether the fuel injector is blocked or worn. The fuel injector reliability detection method and the detection device can effectively detect whether the fuel injector works normally, thereby reminding relevant personnel to maintain or replace the fuel injector in time, and improving the power, economy and safety of the vehicle.

[0004] In the double-valve fuel injector reliability test, long-time detection is needed to accurately obtain the reliability. However, in the detection, fuel is usually supplied to the double-valve fuel injector, and the double-valve fuel injector sprays the fuel into a transparent measuring cylinder, and the reliability of the double-valve fuel injector is measured by measuring the fuel injection amount at a predetermined time or a predetermined number of times. However, this method can only detect the total amount of sprayed fuel, and in some cases, even if the double-valve fuel injector leaks, the total amount of sprayed fuel does not change significantly. Therefore, there is an urgent need for a system that can further monitor the double-valve fuel injector reliability test. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a double-valve fuel injector reliability test system, which has the advantage of being able to timely monitor whether the double-valve fuel injector leaks, and solves the problem of the prior art that there is an urgent need for a system that can further monitor the double-valve fuel injector reliability test.

[0006] The present application is implemented as follows. A double-valve fuel injector reliability test system comprises:

[0007] The fuel supply and recovery subsystem comprises a fuel tank, an oil injection element, an oil injector tool, and a control unit. The inlet end of the oil injection element is connected to the fuel tank, the outlet end of the oil injection element is connected to the inlet end of the double-valve oil injector through the oil injector tool, the oil injector tool is also used to carry the oil injector and to take fuel, and the control unit is used to control the fuel pressure, fuel injection amount, and fuel injection frequency.

[0008] The monitoring subsystem is used to control and monitor the operation of the fuel supply and recovery module, and comprises an image acquisition module used to acquire the spray characteristic image of the double-valve oil injector.

[0009] The database is used to store the spray characteristic model of the double-valve oil injector.

[0010] The first image comparison module is signal connected to the image acquisition module and the database, and is used to compare the spray characteristic image of the double-valve oil injector with the spray characteristic model in the database, and to record the result in the database and / or to issue an alarm through the result output module.

[0011] Preferably, the oil injection element comprises a low-pressure oil supply module and a high-pressure oil supply module.

[0012] The low-pressure oil supply module comprises a first oil pump, one end of which is connected to the fuel tank, and the other end of which is connected to the oil injector tool. The first oil pump takes fuel from the fuel tank to supply fuel to the oil line of the oil injector tool at a pressure of 0.5 MPa or below.

[0013] The high-pressure oil supply module comprises a high-pressure oil pump, a second oil pump, and a rail pressure establishing element. The second oil pump is connected to the fuel tank, the high-pressure oil pump is connected to the second oil pump, and the inlet end of the rail pressure establishing element is connected to the second oil pump. The outlet end of the rail pressure establishing element is connected to the oil injector tool. The high-pressure oil pump takes fuel from the second oil pump to inject the fuel into the rail pressure establishing element to establish rail pressure, and then the rail pressure establishing element injects the fuel into the oil line of the oil injector tool at a high pressure of 0.5-25 MPa.

[0014] Preferably, the fuel tank comprises a main fuel tank and a return fuel tank. The main fuel tank is connected to the oil injection element, and the return fuel tank is connected to the main fuel tank.

[0015] The oil injector tool comprises a connecting element, a carrying element, and a taking element.

[0016] The inlet end of the connecting element is connected to the oil injection element.

[0017] The carrying element is used to clamp and fix the double-valve oil injector.

[0018] The pickup is used for picking up the atomized fuel sprayed by the double valve fuel injector, and is communicated with the oil return tank through the electromagnetic valve.

[0019] As preferred, the application further comprises an oil return pipe, which is communicated with the double valve fuel injector and the oil return tank.

[0020] As preferred, the application further comprises a cooling module, which is connected to the oil return pipe and uses a water cooling mode to quickly reduce the oil temperature of the oil return pipe through heat exchange.

[0021] As preferred, the application further comprises a plurality of workstations, which can simultaneously accommodate the double valve fuel injector.

[0022] The application further comprises a second image comparison module, which is signal connected with the image acquisition module and is used for comparing the spray characteristics of a plurality of double valve fuel injectors in real time or at a fixed time, and recording the results in the database and / or issuing an alarm through the result output module.

[0023] As preferred, the monitoring subsystem further comprises at least one of a pressure sensor, a temperature sensor and a flow meter.

[0024] The pressure sensor is connected with the oil injection member and is used for monitoring the oil pressure of the oil injection member.

[0025] The temperature sensor is connected with the oil injection member and is used for monitoring the fuel temperature of the oil tank and / or the oil injection member.

[0026] The flow meter is connected with the oil injection member and is used for monitoring the flow of the oil injection member.

[0027] As preferred, the application further comprises a secondary oil tank, which comprises a plurality of chambers, each of which contains fuel with different impurities, and is communicated with the main oil tank and can inject the fuel in the chambers into the main oil tank.

[0028] As preferred, the application further comprises a sensor module, which is used for monitoring the oil tank temperature, the oil tank capacity, the oil inlet pressure, the oil return pressure, the working oil temperature and the oil return temperature.

[0029] The application further comprises a display module, which is used for displaying the state of each component of the system, and can be used for selecting the test function, setting different working conditions, setting the measurement time and performing the oil measurement function according to the requirements.

[0030] Compared with the prior art, the application has the following advantages:

[0031] In the present application, when in use, the oil injection part extracts fuel in the fuel tank, and makes the fuel injected into the double valve fuel injector through the fuel injector tool. Under the control of the control unit, the double valve fuel injector continuously sprays atomized fuel, and the fuel injector tool collects the atomized fuel sprayed by the double valve fuel injector. The reliability of long-time operation of the double valve fuel injector is tested by measuring the volume of the atomized fuel collected by the fuel injector tool, for example, by measuring the amount of oil injected by the double valve fuel injector at a set condition for a certain time and a certain number of times, and comparing the amount of oil injected at different times to determine whether the performance of the product changes. Through the setting, the image acquisition module (such as a camera) takes pictures of the atomized fuel sprayed by the double valve fuel injector, and the first image comparison module compares the spray characteristics image (such as oil mist distribution, oil beam direction, range and diffusion cone angle) of the double valve fuel injector with the spray characteristics model in the database, and records the result in the database or issues an alarm. Through the setting, whether the double valve fuel injector leaks oil can be monitored in time. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a double valve fuel injector reliability test system block diagram provided by an embodiment of the present application;

[0033] Figure 2 is a double valve fuel injector reliability test system block diagram provided by an embodiment of the present application with a low pressure fuel supply module and a high pressure fuel supply module;

[0034] Figure 3 is a system block diagram of the low pressure fuel supply module and the high pressure fuel supply module provided by an embodiment of the present application;

[0035] Figure 4 is a system block diagram of the fuel injector tool provided by an embodiment of the present application;

[0036] Figure 5 is a system block diagram with a plurality of double valve fuel injectors provided by an embodiment of the present application;

[0037] Figure 6 is a double valve fuel injector reliability test system block diagram provided by another embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to further understand the invention content, characteristics and effects of the present application, the following embodiments are exemplified, and are described in detail as follows with reference to the accompanying drawings.

[0039] The structure of the present application will be described in detail below with reference to the accompanying drawings.

[0040] Please refer to Figure 1 The double valve fuel injector reliability test system provided by the embodiment of the present application comprises a fuel supply and recovery subsystem and a monitoring subsystem for monitoring the fuel supply and recovery subsystem.

[0041] The fuel supply and recovery subsystem comprises a fuel tank, a fuel injection member, a fuel injector tool, and a control unit, the inlet end of the fuel injection member is communicated with the fuel tank, the outlet end of the fuel injection member is communicated with the oil inlet end of the double-valve fuel injector through the fuel injector tool, the fuel injector tool is also used for carrying the fuel injector and receiving fuel, and the control unit is used for controlling the fuel pressure, the fuel injection amount, and the fuel injection frequency.

[0042] The monitoring subsystem is used for controlling and monitoring the operation of the fuel supply and recovery module, comprising an image acquisition module, a database, and a first image comparison module; the image acquisition module is used for acquiring the spray characteristic image of the double-valve fuel injector; the database is used for storing the spray characteristic model of the double-valve fuel injector and storing the test results; the first image comparison module is signal connected to the image acquisition module and the database, and is used for comparing the spray characteristic image of the double-valve fuel injector with the spray characteristic model in the database, and recording the results into the database and / or issuing an alarm through the result output module.

[0043] In use, the fuel injection member extracts fuel in the fuel tank and injects the fuel into the double-valve fuel injector through the fuel injector tool, under the control of the control unit, the double-valve fuel injector continuously sprays atomized fuel, and the fuel injector tool receives the atomized fuel sprayed by the double-valve fuel injector, the reliability of the long-time operation of the double-valve fuel injector is tested by measuring the volume of the atomized fuel received by the fuel injector tool, for example, by measuring the oil amount sprayed by the double-valve fuel injector at a set working condition for a certain time and a certain number of times, and by comparing the oil injection amounts at different times to determine whether the product performance changes. Through the setting, the image acquisition module (such as a camera) photographs the image of the atomized fuel sprayed by the double-valve fuel injector, the first image comparison module compares the spray characteristic image (such as the oil mist distribution, the oil beam direction, the range, and the diffusion cone angle) of the double-valve fuel injector with the spray characteristic model in the database, and records the results into the database or issues an alarm. Through the setting, whether the double-valve fuel injector leaks oil can be monitored in time.

[0044] Please refer to Figure 2 , the fuel injection member comprises a low-pressure fuel supply module and a high-pressure fuel supply module;

[0045] The low-pressure fuel supply module comprises a first fuel pump, one end of the first fuel pump is communicated with the fuel tank, and the other end is connected to the fuel injector tool, the fuel in the fuel tank is sucked by the first fuel pump to supply fuel to the fuel injector tool oil circuit at a pressure below 0.5 MPa;

[0046] The high-pressure oil supply module comprises a high-pressure oil pump, a second oil pump, and a rail pressure establishing component; the second oil pump is connected to the oil tank, the high-pressure oil pump is connected to the second oil pump, the inlet end of the rail pressure establishing component is connected to the second oil pump, and the outlet end of the rail pressure establishing component is connected to the fuel injector tool. The high-pressure oil pump draws fuel up through the second oil pump and injects the fuel into the rail pressure establishing component to establish rail pressure, and then the rail pressure establishing component injects the fuel into the oil passage of the fuel injector tool at a pressure of 0.5-25 MPa.

[0047] For example, the rail pressure establishing component comprises a rail pipe and a plunger, the plunger is slidingly connected to the rail pipe, and a pressurizing cavity is formed between the plunger and the rail pipe. The fuel in the pressurizing cavity can be pressurized by pushing the plunger. The required rail pressure value can be ensured by adjusting the opening size of the metering valve.

[0048] Please refer to Figure 4 , the oil tank comprises a main oil tank and a return oil tank, the main oil tank is connected to the oil injection component, and the return oil tank is connected to the main oil tank; the fuel injector tool comprises a connecting component, a bearing component, and a receiving component; the inlet end of the connecting component is connected to the oil injection component; the bearing component is used for clamping and fixing the double-valve fuel injector; the receiving component is used for receiving the atomized fuel sprayed by the double-valve fuel injector, and the receiving component is connected to the return oil tank through an electromagnetic valve.

[0049] For example, the receiving component is a transparent measuring cylinder. In use, after the fuel is metered, the electromagnetic valve is opened, and the fuel in the receiving component flows back to the return oil tank. In other feasible embodiments, the fuel in the receiving component can also be pumped into the return oil tank by a metering pump, so that the received fuel can be recycled to the oil tank for use.

[0050] Further, a return oil pipe is further included, and the return oil pipe is connected to the double-valve fuel injector and the return oil tank.

[0051] Further, a cooling module is further included, and the cooling module is connected to the return oil pipe in a fit manner. The oil temperature of the return oil pipe is controlled in a required range by using a water cooling mode and heat exchange to rapidly reduce the oil temperature of the return oil after injection.

[0052] Please refer to Figure 5 , the fuel injector tool has a plurality of stations and can simultaneously accommodate double-valve fuel injectors; a second image comparison module is further included, and the second image comparison module is signal-connected to the image acquisition module and is used for comparing the spray characteristics of a plurality of double-valve fuel injectors in real time or at a fixed time, and recording the results in the database and / or issuing an alarm through the result output module.

[0053] Please refer to Figure 6The monitoring subsystem further comprises at least one of a pressure sensor, a temperature sensor and a flow meter; the pressure sensor is connected to the oil injection part for monitoring the oil pressure of the oil injection part; the temperature sensor is connected to the oil injection part for monitoring the fuel temperature of the oil tank and / or the oil injection part; and the flow meter is connected to the oil injection part for monitoring the flow of the oil injection part.

[0054] Further, the system further comprises a secondary oil tank, the secondary oil tank comprises a plurality of chambers, each chamber is arranged to store fuel with different impurities, and the secondary oil tank is communicated with the main oil tank and can inject the fuel in the chambers into the main oil tank.

[0055] Further, the system further comprises a sensor module for monitoring the oil tank temperature, the oil tank capacity, the oil inlet pressure, the oil return pressure, the working oil temperature and the oil return temperature; and a display module for displaying the state of each component of the system, and can be used for selecting the test function, setting the different working conditions, setting the measurement time and the oil measurement function according to the requirement. Through the setting, several commonly used working interface state functions are preset, and it is not necessary to set and call each time.

[0056] The working principle of the system is as follows:

[0057] In use, the oil injection part draws the fuel in the oil tank and injects the fuel into the double-valve fuel injector through the fuel injector tool, under the control of the control unit, the double-valve fuel injector continuously sprays the atomized fuel, and the fuel injector tool receives the atomized fuel sprayed by the double-valve fuel injector, the reliability of the long-time operation of the double-valve fuel injector is tested by measuring the volume of the atomized fuel received by the fuel injector tool, for example, by measuring the oil volume sprayed by the double-valve fuel injector at a set working condition for a certain time and a certain number of times, and by comparing the oil volume sprayed at different times to determine whether the product performance changes. Through the setting, the image acquisition module (for example, a camera) photographs the image of the atomized fuel sprayed by the double-valve fuel injector, the first image comparison module compares the spray characteristics image (for example, the oil mist distribution, the oil beam direction, the range and the diffusion cone angle) of the double-valve fuel injector with the spray characteristics model in the database, and records the result in the database or issues an alarm. Through the setting, it can be determined in time whether the double-valve fuel injector leaks oil.

[0058] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0059] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A reliability testing system for a dual-valve injector, characterized in that, include: The fuel supply and recovery subsystem includes a fuel tank, a fuel injector, an injector fixture, and a control unit. The inlet end of the fuel injector is connected to the fuel tank, and the outlet end of the fuel injector is connected to the inlet end of a dual-valve injector through the injector fixture. The injector fixture is also used to carry the injector and receive fuel. The control unit is used to control the fuel pressure, fuel injection quantity, and fuel injection frequency. A monitoring subsystem is used to control and monitor the operation of the fuel supply and recovery module, including an image acquisition module, which is used to acquire spray characteristic images of the dual-valve injector; Database used to store spray characteristic models of dual-valve injectors; The first image comparison module is connected to the image acquisition module and the database. It is used to compare the spray characteristic image of the dual-valve injector with the spray characteristic model in the database, and record the result in the database and / or issue an alarm through the result output module. The oil injection unit includes a low-pressure oil supply module and a high-pressure oil supply module; The low-pressure fuel supply module includes a first fuel pump, one end of which is connected to the fuel tank and the other end is connected to the fuel injector fixture. The first fuel pump draws fuel from the fuel tank and supplies fuel to the fuel injector fixture's fuel circuit at a pressure of less than 0.5 MPa. The high-pressure fuel supply module includes a high-pressure fuel pump, a second fuel pump, and a rail pressure establishing component. The second fuel pump is connected to the fuel tank, the high-pressure fuel pump is connected to the second fuel pump, the inlet end of the rail pressure establishing component is connected to the second fuel pump, and the outlet end of the rail pressure establishing component is connected to the injector fixture. The high-pressure fuel pump draws fuel up through the second fuel pump and injects it into the rail pressure establishing component to establish rail pressure. Then, the rail pressure establishing component injects fuel into the fuel circuit of the injector fixture at a high pressure of 0.5-25 MPa. The oil tank includes a main oil tank and a return oil tank. The main oil tank is connected to the oil filling component, and the return oil tank is connected to the main oil tank. The injector fixture includes a connecting component, a supporting component, and a receiving component; The inlet end of the connecting component is connected to the oil injection component; The support component is used to clamp and fix the dual-valve injector; The receiving component is used to receive atomized fuel injected by the dual-valve injector, and the receiving component is connected to the return tank through a solenoid valve. It also includes a return oil pipe, which connects the dual-valve injector and the return oil tank; It also includes a cooling module, which is attached to the return oil pipe. Through a cooling box, it uses water cooling mode and heat exchange to quickly reduce the temperature of the returned oil after injection, thereby controlling the oil temperature of the return oil pipe within the required range. The injector fixture has several stations and can operate simultaneously with a dual-valve injector. It also includes a second image comparison module, which is signal-connected to the image acquisition module. The second image comparison module is used to compare the spray characteristics of several dual-valve injectors in real time or at regular intervals, and to record the results in the database and / or issue an alarm through the result output module.

2. The dual-valve injector reliability testing system as described in claim 1, characterized in that: The monitoring subsystem also includes at least one of a pressure sensor, a temperature sensor, and a flow meter; The pressure sensor is connected to the oil injection component and is used to monitor the oil pressure of the oil injection component; The temperature sensor is connected to the fuel filling component and is used to monitor the fuel temperature of the fuel tank and / or the fuel filling component; The flow meter is connected to the oil injection component and is used to monitor the flow rate of the oil injection component.

3. The dual-valve injector reliability testing system as described in claim 1, characterized in that: It also includes a secondary fuel tank, which comprises several chambers, each containing fuel with different impurities. The secondary fuel tank is connected to the main fuel tank and can inject the fuel in the chambers into the main fuel tank.

4. The dual-valve injector reliability testing system as described in claim 1, characterized in that: It also includes a sensor module for monitoring oil tank temperature, oil tank capacity, inlet oil pressure, return oil pressure, working oil temperature, and return oil temperature; It also includes a display module, which is used to display the status of various components of the system, and can also be used to select test functions, set different working conditions, set measurement time, and measure oil volume according to requirements.

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