Fuel injection amount measuring device

Abstract

The utility model discloses a fuel injection quantity measuring device which comprises a fuel oil / gas injection module, a fuel oil / gas supply module connected with an inlet of the fuel oil / gas injection module and a fuel oil / gas collection module connected with an outlet of the fuel oil / gas injection module. The fuel oil supply module comprises a nitrogen cylinder used for storing high-pressure nitrogen and an energy accumulator used for storing fuel oil. A first pressure adjusting device is connected between an outlet of the nitrogen cylinder and a nitrogen inlet of the energy accumulator, and a fuel outlet of the energy accumulator and an inlet of the fuel injection module are connected with a second pressure adjusting device. The fuel gas supply module comprises a gas storage tank used for storing fuel gas and a third pressure adjusting device connected between the gas storage tank and the fuel gas injection module. The fuel oil / gas injection module comprises an oil / gas rail and an oil / gas injector connected with an outlet of the oil / gas rail. And the fuel oil / gas collecting module comprises a fuel oil / gas collecting container connected with an oil / gas injection port of the oil / gas injector.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a fuel injection quantity measuring device. Background Art

[0002] With the rapid development of China's economy, the number of domestic cars has increased rapidly, and oil consumption has also increased rapidly. The rapid growth of car ownership will bring huge challenges to environmental protection, and it is also a huge consumption of oil resources. The limited domestic crude oil restricts the development of the automobile industry, so it is necessary to study fuel economy. The performance of the injector is directly related to the fuel economy of the car. Measuring the flow characteristics of the injector has a direct impact on the matching of the gasoline engine and the electronic control system and the performance of the electronic control engine, so it is necessary to test and analyze it. In addition, the tension of oil resources has also triggered the research on alternative fuels for vehicles, which makes the adaptability of gas fuels in automotive engines increasingly important. Mastering the injection characteristic curve of the gas nozzle can determine the optimal injection pulse width, which can greatly save bench test time and bring convenience to the matching and calibration of the engine.

[0003] The patent application with announcement number CN206694168U discloses a system for calibrating the injection amount of an injector, including a nitrogen bottle and an accumulator for storing fuel; the bottle mouth of the nitrogen bottle is provided with a pressure reducing device for reducing the pressure of the output gas to the target pressure, the gas outlet of the pressure reducing device is connected to the nitrogen inlet at the top of the accumulator, the fuel outlet at the bottom of the accumulator is connected to the fuel inlet end of the injector to be calibrated through a fuel pipeline, and the injector is also connected to a voltage-stabilizing power supply for controlling its opening and closing; the nozzle of the injector extends into the bottle mouth of a plastic bottle placed below it, the plastic bottle is filled with cotton, and the plastic bottle is placed on a high-precision digital electronic scale. The utility model can accurately measure the injection amount of the injector in each working cycle; the accumulator is used to establish the target fuel pressure, and during the injection process, the target pressure fluctuates less, which is conducive to ensuring the test precision and accuracy.

[0004] The above calibration system is only set in front of the accumulator to adjust the nitrogen pressure entering the accumulator, but it is not convenient to adjust the injection pressure; in addition, the calibration system measures the injection amount by weighing, which is cumbersome to operate and can only realize the injection amount calibration of liquid fuel. Utility Model Content

[0005] The utility model aims to provide a fuel injection quantity measuring device to solve the above-mentioned problems of the existing fuel injection quantity measuring technology.

[0006] To solve the above technical problems, in a first aspect, the present invention provides a fuel injection amount measuring device, comprising a fuel injection module, a fuel supply module connected to an inlet of the fuel injection module, and a fuel collection module connected to an outlet of the fuel injection module;

[0007] The fuel supply module includes a nitrogen bottle for storing high-pressure nitrogen and an accumulator for storing fuel; a first pressure regulating device is connected between the outlet of the nitrogen bottle and the nitrogen inlet of the accumulator, and a second pressure regulating device is connected between the fuel outlet of the accumulator and the inlet of the fuel injection module;

[0008] The fuel injection module includes a fuel rail and a fuel injector connected to an outlet of the fuel rail, and an inlet of the fuel rail is connected to an outlet of the second pressure regulating device;

[0009] The fuel collecting module comprises a fuel collecting container connected to the fuel injection port of the fuel injector.

[0010] Furthermore, the first pressure regulating device includes a first pressure reducing valve connected to the outlet of the nitrogen bottle and a first pressure monitor installed on the pipeline between the first pressure reducing valve and the accumulator; the second pressure regulating device includes a second pressure reducing valve connected between the accumulator and the oil rail and a second pressure monitor for detecting the pressure in the oil rail.

[0011] Furthermore, the fuel collection container is a measuring cylinder, a first sealing plug is arranged in the opening of the measuring cylinder, and the injection port of the injector penetrates the first sealing plug and extends into the measuring cylinder.

[0012] Furthermore, the fuel injection port of the fuel injector is arranged downward, and the measuring cylinder is installed below the fuel injector through a first lifting device.

[0013] In a second aspect, the present invention provides a fuel injection amount measuring device, comprising a gas injection module, a gas supply module connected to an inlet of the gas injection module, and a gas collection module connected to an outlet of the gas injection module;

[0014] The gas supply module includes a gas storage tank for storing gas and a third pressure regulating device connected between the gas storage tank and the gas injection module;

[0015] The gas injection module comprises a gas rail and an injector connected to the outlet of the gas rail, and the inlet of the gas rail is connected to the outlet of the third pressure regulating device;

[0016] The gas collection module comprises a gas collection container connected to the gas injection port of the injector.

[0017] Furthermore, the third pressure regulating device includes a pressure stabilizing chamber and a third pressure reducing valve connected between the gas storage tank and the gas rail, the inlet of the pressure stabilizing chamber is connected to the outlet of the gas storage tank, and the outlet of the third pressure reducing valve is connected to the inlet of the gas rail; a third pressure monitor is provided on the pipeline between the gas storage tank and the pressure stabilizing chamber.

[0018] Furthermore, the gas collection container is a U-shaped tube, in which a liquid insoluble in the gas is filled, one end of the U-shaped tube is connected to the outlet of the gas injection module, and the other end of the U-shaped tube is set to be open and at normal pressure.

[0019] Furthermore, a second sealing plug is provided at one end of the U-shaped tube connected to the gas injection module, and the injection port of the injector penetrates the second sealing plug and extends into the gas collection container.

[0020] Furthermore, the jet port of the jet injector is arranged downward, and the U-shaped tube is installed below the jet injector through a second lifting device.

[0021] In a third aspect, the present invention provides a fuel injection amount measuring device, comprising the above-mentioned fuel injection amount measuring device and the above-mentioned fuel injection amount measuring device; the oil rail and the gas rail adopt a common rail pipe; one end of the common rail pipe is provided with a first volume as the oil rail, the fuel supply module is connected to the inlet of the first volume, and the injector is installed at the outlet of the first volume; the injector and the jet are respectively connected to the single-chip microcomputer through the driving circuit; the other end of the common rail pipe is provided with a second volume as the gas rail; the gas supply module is connected to the inlet of the second volume, and the jet is installed at the outlet of the second volume.

[0022] The beneficial effects of the utility model are:

[0023] 1. By arranging a first pressure regulating device at the inlet of the accumulator, the gas supply pressure of the nitrogen bottle can be controlled; by arranging a second pressure regulating device at the inlet of the fuel rail, the pressure stability during fuel injection can be ensured, thereby accurately controlling the injection of fuel.

[0024] 2. By arranging a third pressure regulating device at the inlet of the gas rail, the stability of the injection pressure can be maintained, thereby enabling accurate control of the injection of the gas.

[0025] 3. The cylinder uses a measuring cylinder and a U-shaped tube to collect fuel oil and gas respectively. The injection amount of fuel oil and gas can be directly obtained through its scale. The measurement method is simple and convenient.

[0026] 4. By combining the fuel supply module and the gas supply module in a common rail manner, it is convenient to measure the injection amount of fuel and gas at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0029] Figure 2 The figure is a schematic diagram of the structure of a pressure stabilizing chamber according to an embodiment of the utility model.

[0030] Among them: 1. nitrogen bottle; 2. first pressure reducing valve; 3. first pressure gauge; 4. accumulator; 5. second pressure reducing valve; 6a. high-pressure gas pipe; 6b. low-pressure oil pipe; 7. second pressure gauge; 8. injector; 9. measuring cylinder; 10. lifting rod; 11. fixed bracket; 12. high-precision electronic analytical balance; 13. gas storage tank; 14. pressure stabilizing chamber; 15. third pressure reducing valve; 16a. high-pressure gas pipe; 16b. low-pressure gas pipe; 17a. oil rail; 17b. gas rail; 18. drive circuit; 19. single-chip microcomputer; 20. PC; 21. second sealing plug; 22. U-shaped tube; 23. rail pressure sensor; 24. third pressure gauge. DETAILED DESCRIPTION

[0031] like Figure 1 The fuel injection amount measuring device shown comprises a fuel injection module, a fuel supply module connected to the inlet of the fuel injection module, and a fuel collection module connected to the outlet of the fuel injection module; the fuel supply module comprises a nitrogen bottle 1 for storing high-pressure nitrogen and an accumulator 4 for storing fuel; a first pressure regulating device is connected between the outlet of the nitrogen bottle 1 and the nitrogen inlet of the accumulator 4, and a second pressure regulating device is connected between the fuel outlet of the accumulator 4 and the inlet of the fuel injection module; the fuel injection module comprises an oil rail 17a and an injector 8 connected to the outlet of the oil rail 17a, and the inlet of the oil rail 17a is connected to the outlet of the second pressure regulating device; the fuel collection module comprises a fuel collection container connected to the injection port of the injector 8.

[0032] The utility model can control the gas supply pressure of the nitrogen bottle 1 by arranging a first pressure regulating device at the inlet of the accumulator 4, and push the fuel into the engine through the high-pressure nitrogen; and can ensure the pressure stability during fuel injection by arranging a second pressure regulating device at the inlet of the fuel rail 17a, so as to accurately control the injection of the fuel.

[0033] According to one embodiment of the present application, the first pressure regulating device includes a first pressure reducing valve 2 connected to the outlet of the nitrogen cylinder 1 and a first pressure monitor installed on the pipeline between the first pressure reducing valve 2 and the accumulator 4; the second pressure regulating device includes a second pressure reducing valve 5 connected between the accumulator 4 and the fuel rail 17a and a second pressure monitor for detecting the pressure in the fuel rail 17a. The nitrogen cylinder 1 provides injection pressure for fuel injection, and the first pressure reducing valve 2 arranged between the high-pressure nitrogen cylinder 1 and the accumulator 4 can be adjusted according to the first pressure monitor (such as Figure 1 The pipeline pressure data monitored by the first pressure gauge 3 shown in FIG. 1 controls the gas pressure when the high-pressure nitrogen cylinder 1 supplies gas, and the second pressure reducing valve 5 between the accumulator 4 and the oil rail 17a can be adjusted according to the second pressure monitor (such as Figure 1 The second pressure gauge 7) shown in FIG. 1 monitors the pressure data in the fuel rail to stabilize the pressure during fuel injection.

[0034] To save costs, the fuel supply pipeline of the fuel supply module can be divided into a high-pressure pipeline and a low-pressure pipeline. The high-pressure pipeline is used between the nitrogen bottle 1 and the accumulator 4, and the pipeline between the accumulator 4 and the fuel rail 17a is a low-pressure pipeline.

[0035] According to one embodiment of the present application, the fuel collection container is a measuring cylinder 9, a first sealing plug is provided in the opening of the measuring cylinder 9, and the injection port of the injector 8 extends through the first sealing plug into the measuring cylinder 9. The measuring cylinder 9 is provided with scale lines, and by using the measuring cylinder 9 to collect the injected fuel, the fuel injection collection is simple, and the amount of injected fuel can be directly measured by the scale, and the measurement method is very simple and convenient; by providing the first sealing plug at the opening of the measuring cylinder 9, the fuel injected into the measuring cylinder 9 can be prevented from splashing out of the measuring cylinder 9.

[0036] According to one embodiment of the present application, the injection port of the injector 8 is set downward, and the measuring cylinder 9 is installed below the injector 8 through a first lifting device. The first lifting device includes a lifting rod 10 and a first mounting bracket installed on the first lifting rod 10, one end of the first mounting bracket is provided with a clamping structure that conforms to the measuring cylinder 9, and the other end of the first mounting bracket can be limited to slide up and down along the first lifting rod 10; by setting the first lifting device, the position of the measuring cylinder 9 can be adjusted according to the height of the injector 8.

[0037] In the second aspect, the present invention provides a fuel injection amount measuring device, comprising a gas injection module, a gas supply module connected to the inlet of the gas injection module, and a gas collection module connected to the outlet of the gas injection module; the gas supply module comprises a gas storage tank 13 for storing gas and a third pressure regulating device connected between the gas storage tank 13 and the gas injection module; the gas injection module comprises a gas rail 17b and an injector connected to the outlet of the gas rail 17b, and the inlet of the gas rail 17b is connected to the outlet of the third pressure regulating device; the gas collection module comprises a gas collection container connected to the injection port of the injector. This embodiment can maintain the stability of the injection pressure by setting the third pressure regulating device at the inlet of the gas rail 17b, so as to accurately control the injection of the gas.

[0038] According to one embodiment of the present application, the third pressure regulating device includes a pressure stabilizing chamber 14 and a third pressure reducing valve 15 connected between the gas storage tank 13 and the gas rail 17b, the inlet of the pressure stabilizing chamber 14 is connected to the outlet of the gas storage tank 13, and the outlet of the third pressure reducing valve 15 is connected to the inlet of the gas rail 17b; a third pressure monitor (such as a pressure sensor) for monitoring the pipeline pressure is provided on the pipeline between the gas storage tank 13 and the pressure stabilizing chamber 14. Figure 1 The third pressure gauge 24 shown in FIG. 1 ). The pressure stabilizing chamber 14 is used to stabilize the jet pressure and improve the measurement accuracy, such as Figure 2 As shown, two solenoid valves are arranged on the pressure stabilizing chamber 14, and the two solenoid valves control the air intake and the air exhaust respectively. Before the gas is injected, the air pressure in the gas rail 17b is monitored in real time by a sensor for detecting the pressure in the gas rail 17b, and the pressure signal is converted into an electrical signal and sent to the electronic control unit. If the air pressure does not reach the set value, the air intake solenoid valve is opened and the air exhaust solenoid valve is closed. When the air pressure reaches the set value, the air intake solenoid valve is closed. In addition, in order to better meet the adjustment of the injection pressure during measurement, a pressure reducing valve is used for further pressure stabilization, which can ensure the stability of the air pressure at the outlet of the pressure reducing valve.

[0039] The pipelines of the gas supply module can also be divided into high-pressure pipelines and low-pressure pipelines. The pipeline from the gas storage tank 13 to the pressure reducing valve uses a high-pressure pipeline to ensure sufficient pressure resistance and good air tightness, while the pipeline from the pressure reducing valve to the gas rail 17b uses a low-pressure pipeline to reduce testing costs.

[0040] According to one embodiment of the present application, the gas collection container is a U-shaped tube 22, and a liquid (such as liquid water) insoluble in the gas is contained in the U-shaped tube 22. One end of the U-shaped tube 22 is connected to the outlet of the gas injection module, and the other end of the U-shaped tube 22 is set to be open and at normal pressure. There are scale lines on the U-shaped tube 22. When the gas is injected from the gas nozzle into the U-shaped tube 22, the gas will squeeze out the water liquid originally in the U-shaped tube 22. After the gas injection is completed, the specific amount of gas injected can be calculated by reading the height value change of the water liquid level in the U-shaped tube 22.

[0041] According to an embodiment of the present application, a second sealing plug 21 is provided at one end of the U-shaped tube 22 connected to the gas injection module, and the injection port of the injector extends into the gas collection container through the second sealing plug 21. By providing the second seal, the gas can be prevented from being lost at the injection port, which would affect the accuracy of the test results.

[0042] According to one embodiment of the present application, the jet port of the jet is set downward, and the U-shaped tube 22 is installed below the jet through a second lifting device. The second lifting device includes a lifting rod 10 and a second mounting bracket installed on the second lifting rod 10, one end of the second mounting bracket is provided with a clamping structure that conforms to the measuring cylinder 9, and the other end of the second mounting bracket can be limited to slide up and down along the second lifting rod 10; by setting the second lifting device, the position of the U-shaped tube 22 can be adjusted according to the position of the jet.

[0043] In the third aspect, the present invention provides a fuel injection amount measuring device, including the above-mentioned fuel injection amount measuring device and the above-mentioned fuel injection amount measuring device; the oil rail 17a and the gas rail 17b adopt a common rail pipe; the injector 8 and the spray gun are respectively connected to the single-chip computer 19 through the drive circuit 18; one end of the common rail pipe is provided with a first volume as the oil rail 17a, the fuel supply module is connected to the inlet of the first volume, and the injector 8 is installed at the outlet of the first volume; the other end of the common rail pipe is provided with a second volume as the gas rail 17b; the gas supply module is connected to the inlet of the second volume, and the spray gun is installed at the outlet of the second volume.

[0044] The single-chip computer 19 is connected to the PC 20, which provides a more convenient human-computer interaction interface for the test personnel and the fuel nozzle test bench and the gas nozzle test bench. The test personnel can monitor and control the operation of the test through the software on the PC 20, and can also analyze, process and store the test data. By writing the control of the fuel injection pulse width and the number of fuel injections and the jet pulse width and the number of jets on the LABVIEW software on the PC 20, and writing them into the single-chip computer 19, the PC 20 is used to control the single-chip computer 19 to work, and the single-chip computer 19 outputs control signals to the fuel injector 8 and the gas nozzle according to the conditions set by the program. After the fuel injector 8 and the gas nozzle receive the driving signal from the single-chip computer 19, the fuel and gas will be sprayed into the measuring cylinder 9 and the U-shaped tube 22 respectively. The injection amount is then weighed by using a high-precision electronic analytical balance 12 connected to the single-chip microcomputer 19. The high-precision electronic analytical balance 12 obtains the weighing data and directly sends it to the single-chip microcomputer 19. The single-chip microcomputer 19 can send the weighing data to the PC 20 for processing, and finally display the measurement results on the PC 20, thereby obtaining the flow characteristic curve of the injector 8.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A fuel injection amount measuring device, characterized in that: It comprises a fuel injection module, a fuel supply module connected to the inlet of the fuel injection module, and a fuel collection module connected to the outlet of the fuel injection module; The fuel supply module includes a nitrogen bottle for storing high-pressure nitrogen and an accumulator for storing fuel; a first pressure regulating device is connected between the outlet of the nitrogen bottle and the nitrogen inlet of the accumulator, and a second pressure regulating device is connected between the fuel outlet of the accumulator and the inlet of the fuel injection module; the first pressure regulating device includes a first pressure reducing valve connected to the outlet of the nitrogen bottle and a first pressure monitor installed on the pipeline between the first pressure reducing valve and the accumulator; the second pressure regulating device includes a second pressure reducing valve connected between the accumulator and the fuel rail and a second pressure monitor for detecting the pressure in the fuel rail; The fuel injection module comprises a fuel rail and a fuel injector connected to an outlet of the fuel rail, and an inlet of the fuel rail is connected to an outlet of the second pressure regulating device; The fuel collection module comprises a fuel collection container connected to the fuel injection port of the fuel injector.

2. The fuel injection amount measuring device according to claim 1, characterized in that: The fuel collection container is a measuring cylinder, a first sealing plug is arranged in the opening of the measuring cylinder, and the injection port of the injector penetrates the first sealing plug and extends into the measuring cylinder.

3. The fuel injection amount measuring device according to claim 2, characterized in that: The fuel injection port of the fuel injector is arranged downward, and the measuring cylinder is installed below the fuel injector through a first lifting device.

4. A fuel injection amount measuring device, characterized in that: It comprises a gas injection module, a gas supply module connected to the inlet of the gas injection module, and a gas collection module connected to the outlet of the gas injection module; The gas supply module includes a gas storage tank for storing gas and a third pressure regulating device connected between the gas storage tank and the gas injection module; The gas injection module comprises a gas rail and an injector connected to the outlet of the gas rail, and the inlet of the gas rail is connected to the outlet of the third pressure regulating device; The gas collection module comprises a gas collection container connected to the gas injection port of the injector.

5. The fuel injection amount measuring device according to claim 4, characterized in that: The third pressure regulating device includes a pressure stabilizing chamber and a third pressure reducing valve connected between the gas storage tank and the gas rail, the inlet of the pressure stabilizing chamber is connected to the outlet of the gas storage tank, and the outlet of the third pressure reducing valve is connected to the inlet of the gas rail; a third pressure monitor is provided on the pipeline between the gas storage tank and the pressure stabilizing chamber.

6. The fuel injection amount measuring device according to claim 4, characterized in that: The gas collection container is a U-shaped tube, in which a liquid insoluble in the gas is contained. One end of the U-shaped tube is connected to the outlet of the gas injection module, and the other end of the U-shaped tube is set to be open and at normal pressure.

7. The fuel injection amount measuring device according to claim 6, characterized in that: A second sealing plug is provided at one end of the U-shaped tube connected to the gas injection module, and the injection port of the injector penetrates the second sealing plug and extends into the gas collection container.

8. The fuel injection amount measuring device according to claim 6 or 7, characterized in that: The jet port of the jet injector is arranged downward, and the U-shaped tube is installed below the jet injector through a second lifting device.

9. A fuel injection amount measuring device, characterized in that: It comprises the fuel injection amount measuring device described in any one of claims 1 to 3 and the fuel injection amount measuring device described in any one of claims 4 to 8; the injector and the gas jet are respectively connected to the single-chip microcomputer through a driving circuit; the oil rail and the gas rail adopt a common rail pipe; one end of the common rail pipe is provided with a first volume as the oil rail, the fuel supply module is connected to the inlet of the first volume, and the injector is installed at the outlet of the first volume; the other end of the common rail pipe is provided with a second volume as the gas rail; the gas supply module is connected to the inlet of the second volume, and the gas jet is installed at the outlet of the second volume.

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