CN116753099B - Engine common rail system comprehensive test device - Google Patents
Engine common rail system comprehensive test device Download PDFInfo
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- CN116753099B CN116753099B CN202310761014.4A CN202310761014A CN116753099B CN 116753099 B CN116753099 B CN 116753099B CN 202310761014 A CN202310761014 A CN 202310761014A CN 116753099 B CN116753099 B CN 116753099B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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Abstract
The application relates to a comprehensive test device for an engine common rail system. The comprehensive test device for the common rail system of the engine comprises an air supply system, a pressure regulating system, an injection system, a first switching valve, a common rail pipe connected between the first switching valve and the injection system, and a control unit respectively connected with the air supply system, the pressure regulating system, the first switching valve and the injection system, wherein air output by the air supply system flows to the pressure regulating system through an air pipe, flows to the injection system through the first switching valve and the common rail pipe after being regulated in the pressure regulating system, is injected to the outside after being regulated in flow by the injection system, and is used for regulating the pressure of the air output by the air supply system, the pressure of the air output by the pressure regulating system and the flow of the air output by the injection system based on preset target parameters. By adopting the method, the working efficiency of the comprehensive test device of the common rail system of the engine can be improved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a comprehensive test device for an engine common rail system.
Background
Along with the development of automobile technology, a hydrogen engine has wide application space in the field of high-power engines, and a common rail hydrogen injection system is deeply accepted by mainstream markets due to unique advancement of the common rail hydrogen injection system, and mainly shows that the common rail hydrogen injection system forms an intelligent system capable of controlling the pressure of the air rail in real time and realizing closed loop through an electric control pressure regulating valve, a pressure sensor, an air rail, an injector and a controller. The hydrogen common rail injection system can adjust the common rail pressure in real time and accurately to control the injection quantity output of the engine, and can realize multi-cylinder injection rules and injection consistency verification more accurately and efficiently.
At present, in the technical field of test research of a hydrogen common rail injection system, because the research and development of a hydrogen injector and a hydrogen electric control pressure regulating valve are both in a starting stage, related testing capability is mainly concentrated on the aspects of testing the injection rate of a single gas injector and the pressure regulating characteristic of the single pressure regulating valve, and a testing platform which comprises key parts of a hydrogen engine hydrogen system and can be used for carrying out real-time control and accurate regulation on the development of different modules such as gas supply, pressure regulating and injection is fresh.
Disclosure of Invention
In view of the above, it is desirable to provide an engine common rail system integrated test device that can improve the operation efficiency of the engine common rail system integrated test device.
The application provides a comprehensive test device for an engine common rail system, which comprises an air supply system, a pressure regulating system, an injection system, a first switching valve, a common rail pipe connected between the first switching valve and the injection system, and a control unit respectively connected with the air supply system, the pressure regulating system, the first switching valve and the injection system;
the gas output by the gas supply system flows to the pressure regulating system through a gas pipe, flows to the injection system through the first switching valve and the common rail pipe after pressure regulation in the pressure regulating system, and is injected to the outside after flow regulation by the injection system in the injection system;
The control unit is used for adjusting the pressure of the gas output by the gas supply system, the pressure of the gas output by the pressure regulating system and the flow of the gas output by the injection system based on preset target parameters.
In one embodiment, the air supply system comprises a high-pressure air bottle, a pressure reducing valve and a temperature regulator, wherein the pressure reducing valve is connected with the control unit;
the gas output by the high-pressure gas cylinder passes through the pressure reducing valve, is decompressed by the pressure reducing valve and then is output to the temperature regulator; the temperature regulator regulates the temperature of the gas output by the pressure reducing valve and then flows to the pressure regulating system through a gas pipe;
the control unit is used for adjusting the opening degree of the pressure reducing valve based on the target output pressure of the preset pressure reducing valve so as to adjust the pressure of the gas output by the pressure reducing valve.
In one embodiment, the pressure regulating system comprises an electric control stop valve and an electric control pressure regulating valve, wherein the electric control stop valve and the electric control pressure regulating valve are respectively connected with the control unit;
the control unit is used for controlling the electric control stop valve to be in a passage state and controlling the first switching valve to be in a closed state, and controlling the opening of the electric control pressure regulating valve based on a preset target rail pressure so that the gas output by the gas supply system is output to the first switching valve after being regulated by the electric control pressure regulating valve.
In one embodiment, the comprehensive test device of the engine common rail system further comprises a temperature and pressure sensor arranged between the electric control stop valve and the electric control pressure regulating valve, wherein the temperature and pressure sensor is connected with the control unit;
The temperature and pressure sensor is used for monitoring the pressure of the inlet of the electric control pressure regulating valve and sending the pressure of the inlet of the pressure regulating valve to the control unit;
the control unit is used for acquiring the pressure of the inlet of the pressure regulating valve sent by the temperature and pressure sensor and controlling the opening of the electric control pressure regulating valve based on the preset target rail pressure and the pressure of the inlet of the pressure regulating valve.
In one embodiment, the integrated test device for the common rail system of the engine further comprises a second switching valve arranged on the common rail pipe, wherein the control unit is further used for controlling the electric control stop valve to be in a passage state, controlling the first switching valve to be in a closing state and controlling the second switching valve to be in a closing state, and under the condition that the internal pressure of the injection system is kept unchanged, sequentially controlling the opening of the electric control pressure regulating valve according to a preset opening gradient.
In one embodiment, the injection system comprises a surge tank, a back pressure valve and at least one injector, wherein the injector is correspondingly provided with an adapter, the surge tank is used for stabilizing outlet pressure fluctuation during external injection, the back pressure valve is used for controlling internal pressure of the surge tank, and the back pressure valve and the injector are respectively connected with the control unit;
The control unit drives at least one ejector to work based on a target driving pulse width, and the gas output by the ejector working under the target driving pulse width flows into the surge tank through the adapter, stabilizes the gas in the surge tank through the back pressure valve, and outputs the gas to the back pressure valve, and the gas is sprayed to the outside through the back pressure valve.
In one embodiment, the device further comprises a pressure sensor arranged between the common rail pipe and the injector and correspondingly connected with the injector, and a flowmeter connected with the back pressure valve;
The pressure sensor is used for monitoring the inlet pressure of the injector corresponding to the injector and sending the inlet pressure of the injector to the control unit under the condition that the control unit drives the injector to work based on a target driving pulse width;
the flowmeter is used for monitoring the flow rate of the gas sprayed to the outside and sending the flow rate of the gas sprayed to the outside to the control unit;
The control unit is used for receiving the injector inlet pressure sent by the pressure sensor and receiving the flow of the externally-injected gas sent by the flowmeter, and obtaining the injection performance parameter of the engine common rail system comprehensive test device based on the injector inlet pressure and the flow of the externally-injected gas, wherein the injection performance parameter comprises at least one of circulation injection amount and injection response time.
In one embodiment, the gas output by the gas supply system is output to the first switching valve after the pressure of the pressure regulating system is regulated, if the control unit controls the first switching valve to be in an open state, the gas in the first switching valve directly flows into the pressure stabilizing tank through the gas pipe, the gas in the pressure stabilizing tank is regulated through the back pressure valve and then is output to the back pressure valve, and the gas is sprayed out through the back pressure valve.
In one embodiment, the comprehensive test device of the engine common rail system further comprises a security system, wherein the security system comprises a gas leakage detector and an alarm, and the gas leakage detector is used for monitoring the concentration of gas;
the control unit acquires the concentration of the gas output by the gas leakage detector, and controls the alarm to alarm when the concentration of the gas reaches a gas concentration threshold.
In one embodiment, the comprehensive test device of the engine common rail system further comprises a second switching valve arranged on the common rail pipe, and the control unit is further used for switching off an electric control pressure regulating valve in the pressure regulating system and opening the second switching valve when determining that the concentration of the gas output by the gas leakage detector reaches a gas concentration threshold value, so that the gas output by the pressure regulating system is discharged through the second switching valve.
The comprehensive test device for the common rail system of the engine comprises an air supply system, a pressure regulating system, an injection system, a first switching valve, a common rail pipe connected between the first switching valve and the injection system, and a control unit respectively connected with the air supply system, the pressure regulating system and the injection system, wherein air output by the air supply system flows to the pressure regulating system through an air pipe, flows to the injection system through the first switching valve and the common rail pipe after being regulated in the pressure regulating system, is injected to the injection system after being regulated in flow in the injection system, and is used for regulating the pressure of the air output by the air supply system, the pressure of the air output by the pressure regulating system and the flow of the air output by the injection system based on preset target parameters. The comprehensive test device for the engine common rail system, which is integrated with the air supply system, the pressure regulating system, the injection system and the control unit, can strengthen the flexibility of equipment control, and the control unit can respectively expand and regulate the air supply system, the pressure regulating system and the injection system based on preset target parameters, so that the working efficiency of the comprehensive test device for the engine common rail system is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a block diagram of an engine common rail system integrated test apparatus according to one embodiment;
FIG. 2 is a block diagram of an engine common rail system integrated test apparatus according to another embodiment;
FIG. 3 is a block diagram of an engine common rail system integrated test apparatus according to an embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
In one embodiment, as shown in fig. 1, the integrated test device for the common rail system of the engine comprises an air supply system, a pressure regulating system, an injection system, a first switching valve, a common rail pipe connected between the first switching valve and the injection system, and a control unit respectively connected with the air supply system, the pressure regulating system, the first switching valve and the injection system, wherein air output by the air supply system flows to the pressure regulating system through an air pipe, flows to the injection system through the first switching valve and the common rail pipe after being regulated in the pressure regulating system, and is injected to the outside after being regulated in flow by the injection system, and the control unit is used for regulating the pressure of the air output by the air supply system, the pressure of the air output by the pressure regulating system and the flow of the air output by the injection system based on preset target parameters.
The gas supply system can be a system for providing a certain pressure, temperature and flow of gas, wherein the gas can be hydrogen or other types of gas. The pressure regulating system can be used for regulating the pressure of the gas, and the pressure of the gas can be accurately regulated through the pressure regulating system. The injection system can precisely control the injection flow. The control unit can be respectively connected with the air supply system, the pressure regulating system, the first switching valve and the injection system, and can adopt a control main board, and the control main board can be provided with a CPU (Central Processing Unit, a central processing unit), an MCU (Micro Control Unit, a micro control unit) and other devices. The control unit may control the air supply system, the pressure regulating system, the first switching valve, and the injection system, respectively. The control unit may be integrated with a data acquisition unit, and is configured to process and analyze the acquired data, and output the processed data according to a specified template, where the data acquisition unit may be independent of the control unit.
The preset target parameters can be set indexes which are respectively reached by the air supply system, the pressure regulating system and the injection system. For the gas supply system, the corresponding preset target parameter may be a target gas pressure required to be output by the gas supply system, for the pressure regulating system, the corresponding preset target parameter may be a target rail pressure required to be achieved, and for the injection system, the corresponding preset target parameter may be an injection flow.
Specifically, the gas output by the gas supply system flows to the pressure regulating system through the gas pipe, and after the pressure is regulated by the pressure regulating system, the gas flows to the common rail pipe through the gas pipe, and the common rail pipe is connected with the injection system through the gas pipe. The control unit is connected with the air supply system, the pressure regulating system, the first switching valve and the injection system, and controls the air supply system, the pressure regulating system, the first switching valve and the injection system to work so as to meet the working requirements of the air supply system, the pressure regulating system, the first switching valve and the injection system.
The comprehensive test device for the common rail system of the engine comprises an air supply system, a pressure regulating system, an injection system, a first switching valve, a common rail pipe connected between the first switching valve and the injection system, and a control unit respectively connected with the air supply system, the pressure regulating system and the injection system, wherein air output by the air supply system flows to the pressure regulating system through an air pipe, flows to the injection system through the first switching valve and the common rail pipe after being regulated in the pressure regulating system, is injected to the injection system after being regulated in flow in the injection system, and is used for regulating the pressure of the air output by the air supply system, the pressure of the air output by the pressure regulating system and the flow of the air output by the injection system based on preset target parameters. The comprehensive test device for the engine common rail system, which is integrated with the air supply system, the pressure regulating system, the injection system and the control unit, can strengthen the flexibility of equipment control, and the control unit can respectively expand and regulate the air supply system, the pressure regulating system and the injection system based on preset target parameters, so that the working efficiency of the comprehensive test device for the engine common rail system is improved.
In one embodiment, the gas supply system comprises a high-pressure gas cylinder, a pressure reducing valve and a temperature regulator, wherein the pressure reducing valve is connected with the control unit, gas output by the high-pressure gas cylinder is reduced in pressure through the pressure reducing valve and then is output to the temperature regulator, the temperature regulator is used for regulating the temperature of the gas output by the pressure reducing valve and then flows to the pressure regulating system through a gas pipe, and the control unit is used for regulating the opening of the pressure reducing valve based on the preset target output pressure of the pressure reducing valve so as to regulate the pressure of the gas output by the pressure reducing valve.
The high-pressure gas cylinder stores gas, the pressure reducing valve can adjust the pressure of the gas output by the high-pressure gas cylinder, and the temperature regulator can adjust the temperature of the gas output by the pressure reducing valve. The preset relief valve target output pressure may be a pressure to be reached by the gas to be output after the gas passes through the relief valve, and may correspond to an opening degree of the relief valve. In general, the pressure of the gas to be output may be reduced from a high-pressure gas to a medium-pressure state by a pressure reducing valve, and the pressure of the gas to be output by the pressure reducing valve may be maintained at about 40 to 60 bar.
Specifically, in the gas supply system, the gas in the high-pressure gas cylinder, such as hydrogen, is depressurized through the depressurization valve, and the control unit can control the opening degree of the depressurization valve to achieve the depressurization effect, and then the gas is output through the gas pipe after temperature adjustment through the temperature regulator.
In the embodiment, the pressure and the temperature of the output gas can be kept constant through the gas supply system, and the reliability of the comprehensive test device of the common rail system of the engine is improved.
In one embodiment, the pressure regulating system comprises an electric control stop valve and an electric control pressure regulating valve, wherein the electric control stop valve and the electric control pressure regulating valve are respectively connected with a control unit, the control unit is used for controlling the electric control stop valve to be in a passage state and controlling the first switching valve to be in a closing state, and based on a preset target rail pressure, the opening degree of the electric control pressure regulating valve is controlled, so that gas output by the gas supply system is regulated by the electric control pressure regulating valve and then is output to the first switching valve.
The control unit can realize the on-off of the gas circuit by controlling the opening and closing of the electric control stop valve and the first switching valve. The electric control pressure regulating valve is a valve for regulating and controlling pressure, and specifically can realize different rail pressure output by regulating the opening of the valve of the electric control pressure regulating valve. The electric control stop valve is in a passage state, namely the gas passage is in a open state, and gas output from the gas supply system can flow into the electric control pressure regulating valve. The control unit can control the air passage to realize various testing functions, such as switching of the testing function of the ejector and the testing function of the electric control pressure regulating valve. The preset target rail pressure can be rail pressure required by different operation conditions of the engine to be simulated, the preset target rail pressure can correspond to the opening of the electric control pressure regulating valve, and the control unit can realize different rail pressure output by controlling the opening of the electric control pressure regulating valve.
Specifically, after hydrogen in the high-pressure gas cylinder passes through the pressure reducing valve and the temperature regulator, the gas pipe is connected with the electric control stop valve, the electric control stop valve controls the gas path to be opened and closed, the electric control stop valve is connected with the electric control pressure regulating valve through the gas pipe, and the electric control pressure regulating valve outputs the gas to the first switching valve after regulating the pressure of the gas.
In this embodiment, the control unit may control the opening of the electronically controlled pressure regulating valve according to the different operation conditions of the engine to be simulated, thereby improving the control accuracy.
In one embodiment, the comprehensive test device of the engine common rail system further comprises a temperature and pressure sensor arranged between the electric control stop valve and the electric control pressure regulating valve, wherein the temperature and pressure sensor is connected with the control unit, the temperature and pressure sensor is used for monitoring the inlet pressure of the pressure regulating valve of the electric control pressure regulating valve and sending the inlet pressure of the pressure regulating valve to the control unit, and the control unit is used for acquiring the inlet pressure of the pressure regulating valve sent by the temperature and pressure sensor and controlling the opening of the electric control pressure regulating valve based on a preset target rail pressure and the inlet pressure of the pressure regulating valve.
The temperature and pressure sensor can be a sensor integrated with a temperature test function and a pressure test function, and the pressure of the inlet of the pressure regulating valve is the pressure of gas when the gas is input into the electric control pressure regulating valve. The temperature and pressure sensor is arranged between the electric control stop valve and the electric control pressure regulating valve, and can be used for measuring the pressure of the inlet of the pressure regulating valve of the electric control pressure regulating valve. The control unit can acquire the pressure of the inlet of the pressure regulating valve sent by the temperature and pressure sensor, and control the opening of the electric control pressure regulating valve based on the preset target rail pressure and the pressure of the inlet of the pressure regulating valve.
In this embodiment, the control unit may improve control performance and control reliability by acquiring the pressure of the pressure regulating valve inlet of the system monitored by the temperature and pressure sensor, and expanding the opening control of the electronically controlled pressure regulating valve according to the preset target rail pressure and the pressure of the pressure regulating valve inlet of the engine to be simulated.
In one embodiment, the comprehensive test device of the common rail system of the engine further comprises a second switching valve arranged on the common rail pipe, the control unit is further used for controlling the electric control stop valve to be in a passage state, controlling the first switching valve to be in a closing state and controlling the second switching valve to be in a closing state, and the control unit is further used for sequentially controlling the opening of the electric control pressure regulating valve according to a preset opening gradient under the condition that the internal pressure of the injection system is kept unchanged.
The control unit can set the electric control stop valve to be in a passage state, and control the first switching valve and the second switching valve to be in a closed state, namely, open the electric control stop valve, and close the first switching valve and the second switching valve, and the working mode of the electric control pressure regulating valve can be called at the moment. When the electric control pressure regulating valve working mode is adopted, the measurement and control unit controls the back pressure valve of the injection system, so that the pressure of the pressure stabilizing tank of the injection system is stabilized at different target values. Further, the control unit may sequentially control the opening of the electric control pressure regulating valve according to a preset opening gradient, and the opening of the electric control pressure regulating valve may be determined according to the magnitude of the driving current driving the electric control pressure regulating valve, so that the driving current of the electric control pressure regulating valve may be changed from small to large, and at this time, the flow rate of the gas passing through the electric control pressure regulating valve may also be changed from small to large, and the control unit may obtain a relation curve of the driving current and the flow rate of the gas, so as to obtain the performance characteristic of the electric control pressure regulating valve, record the test result and generate a report, and evaluate the performance of the electric control pressure regulating valve.
In this embodiment, when the electronic control pressure regulating valve is in the working mode, the measurement and control unit controls the back pressure valve of the injection system, so that the pressure of the pressure stabilizing tank of the injection system is stabilized at different target values, and at this time, the injection system does not work because the injection system adopts an outward opening type injector, and the pressure in the pressure stabilizing tank makes the injector be in a closed state, thereby obtaining the performance characteristics of the electronic control pressure regulating valve.
In one embodiment, the injection system comprises a surge tank, a back pressure valve and at least one injector, the injector being correspondingly provided with an adapter; the device comprises a pressure stabilizing tank, a back pressure valve, a control unit, a pressure regulating valve and an ejector, wherein the pressure stabilizing tank is used for stabilizing outlet pressure fluctuation during external injection;
The control unit drives at least one ejector to work based on a target driving pulse width, the gas output by the ejector working under the target driving pulse width flows into the pressure stabilizing tank through the adapter, the gas in the pressure stabilizing tank is stabilized through the back pressure valve and then is output to the back pressure valve, and the gas is sprayed out through the back pressure valve.
The back pressure valve is used for controlling the pressure in the pressure stabilizing tank, and the back pressure regulating valve is a PID (proportional integral derivative) closed-loop pressure regulating valve controlled by a controller of a measurement and control system, so that the pressure in the adapter can be always ensured to be stable near a target value. The injector is used to inject gas into the adapter. The common rail pipe may refer to an air rail connecting between the air supply system and the injection system.
Specifically, the gas output by the gas supply system is output to the first switching valve after the pressure of the pressure regulating system is regulated, if the control unit controls the first switching valve to be in a closed state, the gas in the first switching valve flows into at least one injector through the common rail pipe, the injector injects the gas into the adapter, and the gas in each adapter is led to the atmosphere after passing through the pressure stabilizing tank. The back pressure valve is arranged behind the surge tank, and the back pressure valve controls the pressure in the surge tank through the control unit by controlling the back pressure valve, so that the pressure in the surge tank is maintained at about 3bar and is used for simulating the cylinder pressure in the working state of the engine.
In one embodiment, the gas output by the gas supply system is output to the first switching valve after the pressure of the pressure regulating system is regulated, the first switching valve is controlled to be in a closed state, and meanwhile, one ejector is driven to work, so that the driving current of the ejector is changed, and the test is performed. The control unit can collect the injector driving current signal, inlet pressure fluctuation and flow value of the outlet flowmeter, automatically analyze the signals to obtain injector opening delay time, injector closing delay time, injector duration and single injection quantity, record test results, test the performance of a plurality of injectors respectively according to the sequence by referring to the processes, and finally display the results of 6 injectors to generate a test report.
In one embodiment, the gas output by the gas supply system is output to the first switching valve after the pressure of the pressure regulating system is regulated, the first switching valve is controlled to be in a closed state, six ejectors are simultaneously driven to simultaneously work according to set working conditions, the flow of the outlet flowmeter is monitored, and when the flow exceeds the set value, the system alarms.
In one embodiment, the device further comprises a pressure sensor which is arranged between the common rail pipe and the injector and is correspondingly connected with the injector, and a flowmeter which is connected with the back pressure valve, wherein the pressure sensor is used for monitoring the inlet pressure of the injector corresponding to the injector and sending the inlet pressure of the injector to the control unit under the condition that the control unit drives the injector to work based on a target driving pulse width, the flowmeter is used for monitoring the flow rate of gas sprayed to the outside and sending the flow rate of gas sprayed to the outside to the control unit, and the control unit is used for receiving the inlet pressure of the injector sent by the pressure sensor and the flow rate of gas sprayed to the outside and obtaining the injection performance parameter of the engine common rail system comprehensive test device based on the inlet pressure of the injector and the flow rate of gas sprayed to the outside, and the injection performance parameter comprises at least one of circulation injection amount and injection response time.
Wherein the flowmeter is used for measuring the flow of gas when the injection system works. The back pressure regulating valve is arranged behind the pressure stabilizing tank, and the back pressure regulating valve controls the pressure in the pressure stabilizing tank through the measurement and control system, so that the pressure in the pressure stabilizing tank is maintained at about 3bar and is used for simulating the cylinder pressure in the working state of the engine. The back pressure in the adapter is regulated with a back pressure regulating valve in response to the flow change. In the injection system, a pressure sensor is arranged at the inlet of the injector and is used for detecting inlet pressure fluctuation when the single injector works, so that the response time of the single injector is obtained, and the circulating injection amount can be deduced by combining the test result of the flowmeter.
In one embodiment, the gas output by the gas supply system is output to the first switching valve after the pressure of the pressure regulating system is regulated, if the control unit controls the first switching valve to be in an open state, the gas in the first switching valve directly flows into the pressure stabilizing tank through the gas pipe, the gas in the pressure stabilizing tank is regulated through the back pressure valve and then is output to the back pressure valve, and the gas is sprayed out through the back pressure valve.
When the first switching valve is opened, gas directly flows into the pressure stabilizing tank through the electric control pressure regulating valve, and the injection system adopts an outward opening type injector, so that the injection system does not work, the injector is in a closed state due to the pressure in the pressure stabilizing tank, and the electric control pressure regulating valve testing system is isolated from the injector system. Wherein, the pressure stabilizing tank can be provided with a pressure sensor. The back pressure valve behind the surge tank is used for controlling the back pressure in the surge tank, and the flowmeter is used for measuring the gas flow passing through the electric control pressure regulating valve.
In one embodiment, the comprehensive test device of the common rail system of the engine further comprises a security system, the security system comprises a gas leakage detector and an alarm, the gas leakage detector is used for monitoring the concentration of gas, the gas leakage detector and the alarm are respectively connected with a control unit, the control unit obtains the concentration of the gas output by the gas leakage detector, and when the concentration of the gas reaches a gas concentration threshold value, the alarm is controlled to alarm.
The security system comprises a gas leakage detector and an alarm, wherein the gas leakage detector is used for monitoring the gas leakage amount in the test bench, such as the leakage amount of hydrogen. The gas concentration threshold is a set threshold for determining whether to alarm or not, the gas leakage detector can send the concentration of the gas acquired currently to the control unit, the control unit judges whether the concentration of the gas reaches the gas concentration threshold, and when the concentration of the gas reaches the gas concentration threshold, the control unit can control the alarm to alarm so as to prompt a user, so that the safety is improved.
In one embodiment, the control unit is further configured to turn off the electronically controlled pressure regulating valve in the pressure regulating system and open the second switching valve when it is determined that the concentration of the gas output by the gas leakage detector reaches the gas concentration threshold, so that the gas output by the pressure regulating system is discharged through the second switching valve.
When the control unit determines that the concentration of the gas output by the gas leakage detector reaches the gas concentration threshold, the control unit can also close the electric control pressure regulating valve of the pressure regulating system, so that the gas cannot be output from the pressure regulating system, and simultaneously opens the second switching valve, so that the gas output by the pressure regulating system is discharged through the second switching valve.
In one embodiment, as shown in fig. 2, the comprehensive experiment table of the hydrogen common rail system provided in the embodiment includes a gas supply system, a pressure regulating valve system, an injection system, a measurement and control system, a data acquisition and control system and a security system. The performance and reliability test of the hydrogen injector shown in fig. 3 can be realized by using the comprehensive test bench.
In the gas supply system, after hydrogen in a high-pressure gas cylinder 1 passes through a pressure reducing valve 2 and a temperature regulator 3, the hydrogen is connected with an electric control stop valve 4 through a gas pipe, the electric control stop valve 4 controls gas path on-off, the electric control stop valve 4 is connected with an electric control pressure regulating valve 5 through a gas pipe, a pressure sensor P1 and a temperature sensor T1 are arranged in front of the electric control pressure regulating valve 5, when a switching valve 15 is closed, the electric control pressure regulating valve 5 flows to a gas rail 6 through the gas pipe, the gas rail 6 is provided with the pressure sensor P4 and the temperature sensor T4, one path of the gas rail 6 flows to an ejector 8 through the gas pipe, and a high-frequency pressure sensor P2 is arranged at an inlet of the ejector 8 and used for detecting pressure fluctuation of the inlet of the ejector. The injector 8 is arranged on the adapter 9, the adapter 9 is connected with the surge tank 10 through an air pipe, the volume of the surge tank 10 is 500 times of that of the adapter 9 and is used for reducing outlet pressure fluctuation caused by injection, a pressure sensor P3 is arranged at the outlet of the adapter 9 and is used for monitoring injection back pressure, a back pressure regulating valve 11 is arranged at the outlet of the surge tank 10 and is used for controlling the pressure in the cavity of the adapter 9, gas flows out through the outlet of the back pressure regulating valve 11 and flows out through a flowmeter 12, and the flowmeter 12 is a mass flowmeter and can measure the average flow of multiple injections. The other path of gas is arranged on the gas rail 6, and the gas in the gas rail is discharged through the switching valve 7.
When the multi-cylinder consistency test of the injectors is carried out, the button 'multi-cylinder consistency test' (shown in fig. 2) shown in fig. 3 is clicked, the electric control stop valve 4 is opened, the switching valve 7 is closed, the measurement and control system controls the pressure of the air rail 6 by controlling the opening degree of the electric control pressure regulating valve 5, simultaneously, six injectors 8 are controlled to work simultaneously, the data acquisition and control system automatically acquires the pressure fluctuation of the inlets of the injectors, and the consistency of the pressure fluctuation of the inlets of each cylinder is automatically analyzed to judge whether the injection quantity of the six injectors is consistent. The six injectors are consistent in characteristics, the interface displays 'passing', the six injectors are inconsistent in characteristics, the interface displays 'failure injector cylinder number', and an alarm signal is sent out.
When the single injection characteristic test of the injector is carried out, the button 'injection characteristic test' shown in fig. 3 is clicked, the electric control stop valve 4 is opened, the switching valve 7 is closed, the measurement and control system controls the pressure of the air rail 6 by controlling the electric control pressure regulating valve 5, and meanwhile, one injector is driven to work, the driving current of the injector is changed, and the test is carried out. The data acquisition and control system acquires the injector driving current signal, the inlet pressure fluctuation and the flow value of the outlet flowmeter, performs automatic analysis to obtain the injector opening delay time, the injector closing delay time, the injector duration and the single injection quantity, records the test result, respectively tests the performance of 6 injectors according to the sequence by referring to the above processes, and finally displays the results of the 6 injectors to generate a test report.
And (3) performing reliability test on the injectors, clicking a button 'reliability test' shown in fig. 3, opening the electric control stop valve 4, closing the switching valve 7, controlling the pressure of the air rail 6 to 30bar by the measurement and control system through controlling the electric control pressure regulating valve 5, simultaneously driving six injectors to work simultaneously according to set working conditions, simultaneously monitoring the flow of the outlet flowmeter 12, and giving an alarm when the flow exceeds a set value. And then automatically starting an injection characteristic test to perform a single injector performance test, judging a fault part, and closing the electric control pressure regulating valve 5 and closing the injector after the test is finished.
When the gas leakage detector 14 detects gas leakage in the testing process, the security system is started, the electric control stop valve 4 is closed, the switching valve 7 is opened, and redundant gas in the system is discharged for maintenance.
The embodiment provides a hydrogen common rail system comprehensive experiment table, which comprises an air supply system, a pressure regulating system, an injection system, a measurement and control system, a data acquisition and control system and a security system. The comprehensive test bench can be used for realizing the performance test of the hydrogen electric control pressure regulating valve. In the gas supply system, after hydrogen in a high-pressure gas cylinder 1 passes through a pressure reducing valve 2 and a temperature regulator 3, the hydrogen is connected with an electric control stop valve 4 through a gas pipe, the electric control stop valve 4 controls gas path on-off, the electric control stop valve 4 is connected with an electric control pressure regulating valve 5 through a gas pipe, a pressure sensor P1 and a temperature sensor T1 are arranged in front of the electric control pressure regulating valve 5, when a switching valve 15 is opened, the gas passes through the electric control pressure regulating valve 5 to flow to a pressure stabilizing tank 10, and the pressure stabilizing tank 10 is provided with a pressure sensor P3. The back pressure valve behind surge tank 10 is used to control the back pressure in the surge tank and flowmeter 12 is used to meter the flow of gas through the electronically controlled pressure regulating valve. Because the ejector 8 is an outward opening ejector, when the electric control pressure regulating valve working mode is adopted, the back pressure valve is controlled by the measurement and control system, so that the pressure of the pressure regulating tank 10 is stabilized at different target values, at the moment, the ejector system does not work because the ejector system adopts the outward opening ejector, the ejector is in a closed state due to the pressure in the pressure regulating tank, and at the moment, the electric control pressure regulating valve testing system is isolated from the ejector system.
When the performance test of the electric control pressure regulating valve is carried out, the button 'performance test' shown in fig. 3 is clicked, the pressure after the pressure reducing valve 2 is set to 40bar, the electric control stop valve 4 is opened, the switching valve 7 is closed, and the back pressure valve is controlled by the measurement and control system to control the pressure in the pressure stabilizing tank, for example, 10bar, 20bar and 30bar. The pressure of the pressure stabilizing tank is kept at a certain pressure, the electric control pressure regulating valve 5 is controlled to change the driving current from small to large, the flow passing through the electric control pressure regulating valve 5 is also changed from small to large, the data acquisition processing system acquires a relation curve of the driving current and the gas flow, so that the performance characteristic of the electric control pressure regulating valve is obtained, the test result is recorded, a report is generated, and the performance of the electric control pressure regulating valve is evaluated.
When the reliability test of the electric control pressure regulating valve is carried out, the button 'reliability test' shown in fig. 3 is clicked, the electric control stop valve 4 is opened, the switching valve 7 is closed, the test working condition is set by the measurement and control system, the action of the electric control pressure regulating valve is controlled, the cycle test is carried out, and the 'performance test' is automatically started every 2 hours to carry out the self-test of the performance of the pressure regulating valve. And alarming and stopping when abnormality occurs, and recording process data.
When the gas leakage detector 14 detects gas leakage in the testing process, the security system is started, the electric control stop valve 4 is closed, the electric control stop valve 4 is opened, redundant gas in the system is discharged, and overhauling is performed.
In the gas supply system, after hydrogen in a high-pressure gas cylinder 1 passes through a pressure reducing valve 2 and a temperature regulator 3, the hydrogen is connected with an electric control stop valve 4 through a gas pipe, the electric control stop valve 4 controls gas path on-off, the electric control stop valve 4 is connected with an electric control pressure regulating valve 5 through a gas pipe, a pressure sensor P1 and a temperature sensor T1 are arranged in front of the electric control pressure regulating valve 5, the electric control pressure regulating valve 5 flows to a gas rail 6 through the gas pipe, the pressure sensor P4 and the temperature sensor T4 are arranged on the gas rail 6, and the other path of hydrogen is discharged through a switching valve 7. The air rail 6 flows through an air pipe to the injector 8, and a high-frequency pressure sensor P2 is arranged at the inlet of the injector 8 for detecting injector inlet pressure fluctuation. The ejector 8 is arranged on the adapter 9, the adapter 9 is connected with the surge tank 10 through an air pipe, the volume of the surge tank 10 is 500 times of that of the adapter 9 and is used for reducing outlet pressure fluctuation, a pressure sensor P3 is arranged at the outlet of the adapter 9 and is used for monitoring jet back pressure, a back pressure regulating valve 11 is arranged at the outlet of the surge tank 10 and is used for controlling the pressure in the cavity of the adapter 9, gas flows out through a flowmeter 12 through the outlet of the back pressure regulating valve 11, and the flowmeter 12 is a mass flowmeter and can measure the average flow of multiple jets.
When the reliability test of the hydrogen common rail system is carried out, a button shown in fig. 3, namely the system reliability test, is clicked, the electric control stop valve 4 is opened, the switching valve 7 is closed, the test working condition is set by the measurement and control system for carrying out the cycle test, meanwhile, the flow of the flowmeter 13 and the pressure fluctuation of the gas rail 6 are monitored, and the system is warned to stop when abnormality occurs. Switching to the performance test of the injector and the operation judgment of the fault cause in the performance test program of the electric control pressure regulating valve according to the requirement.
When the gas leakage detector 14 detects gas leakage in the testing process, the security system is started, the electric control stop valve 4 is closed, the electric control stop valve 4 is opened, redundant gas in the system is discharged, and overhauling is performed.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The comprehensive test device for the common rail system of the engine is characterized by comprising an air supply system, a pressure regulating system, an injection system, a first switching valve, a common rail pipe connected between the first switching valve and the injection system and a control unit respectively connected with the air supply system, the pressure regulating system, the first switching valve and the injection system;
the gas output by the gas supply system flows to the pressure regulating system through a gas pipe, flows to the injection system through the first switching valve and the common rail pipe after pressure regulation in the pressure regulating system, and is injected to the outside after flow regulation by the injection system in the injection system;
the control unit is used for adjusting the pressure of the gas output by the gas supply system, the pressure of the gas output by the pressure regulating system and the flow of the gas output by the injection system based on preset target parameters;
the injection system comprises a surge tank, a back pressure valve and at least one injector, wherein the injector is correspondingly provided with an adapter, the surge tank is used for stabilizing outlet pressure fluctuation during external injection, the back pressure valve is used for controlling internal pressure of the surge tank, and the back pressure valve and the injector are respectively connected with the control unit;
the control unit drives at least one ejector to work based on a target driving pulse width, and the gas output by the ejector working under the target driving pulse width flows into the surge tank through the adapter, stabilizes the gas in the surge tank through the back pressure valve, and outputs the gas to the back pressure valve, and the gas is sprayed out through the back pressure valve;
the control unit is also used for controlling the gas path to realize the ejector test function, the electric control pressure regulating valve test function and the hydrogen common rail system test function.
2. The comprehensive test device for the common rail system of the engine, according to claim 1, is characterized in that the air supply system comprises a high-pressure air bottle, a pressure reducing valve and a temperature regulator, wherein the pressure reducing valve is connected with the control unit;
the gas output by the high-pressure gas cylinder passes through the pressure reducing valve, is decompressed by the pressure reducing valve and then is output to the temperature regulator; the temperature regulator regulates the temperature of the gas output by the pressure reducing valve and then flows to the pressure regulating system through a gas pipe;
the control unit is used for adjusting the opening degree of the pressure reducing valve based on the target output pressure of the preset pressure reducing valve so as to adjust the pressure of the gas output by the pressure reducing valve.
3. The comprehensive test device for the engine common rail system according to claim 1, wherein the pressure regulating system comprises an electric control stop valve and an electric control pressure regulating valve, and the electric control stop valve and the electric control pressure regulating valve are respectively connected with the control unit;
the control unit is used for controlling the electric control stop valve to be in a passage state and controlling the first switching valve to be in a closed state, and controlling the opening of the electric control pressure regulating valve based on a preset target rail pressure so that the gas output by the gas supply system is output to the first switching valve after being regulated by the electric control pressure regulating valve.
4. The comprehensive test device for the engine common rail system according to claim 3, further comprising a temperature and pressure sensor arranged between the electric control stop valve and the electric control pressure regulating valve, wherein the temperature and pressure sensor is connected with the control unit;
The temperature and pressure sensor is used for monitoring the pressure of the inlet of the electric control pressure regulating valve and sending the pressure of the inlet of the pressure regulating valve to the control unit;
the control unit is used for acquiring the pressure of the inlet of the pressure regulating valve sent by the temperature and pressure sensor and controlling the opening of the electric control pressure regulating valve based on the preset target rail pressure and the pressure of the inlet of the pressure regulating valve.
5. The integrated test device for the common rail system of the engine according to claim 3, further comprising a second switching valve arranged on the common rail pipe, wherein the control unit is further used for controlling the electric control stop valve to be in a passage state, controlling the first switching valve to be in a closed state and controlling the second switching valve to be in a closed state, and sequentially controlling the opening of the electric control pressure regulating valve according to a preset opening gradient under the condition that the internal pressure of the injection system is kept unchanged.
6. The engine common rail system integrated test device according to claim 1, further comprising a pressure sensor provided between the common rail pipe and the injector and connected to the injector, and a flow meter connected to the back pressure valve;
The pressure sensor is used for monitoring the inlet pressure of the injector corresponding to the injector and sending the inlet pressure of the injector to the control unit under the condition that the control unit drives the injector to work based on a target driving pulse width;
the flowmeter is used for monitoring the flow rate of the gas sprayed to the outside and sending the flow rate of the gas sprayed to the outside to the control unit;
The control unit is used for receiving the injector inlet pressure sent by the pressure sensor and receiving the flow of the externally-injected gas sent by the flowmeter, and obtaining the injection performance parameter of the engine common rail system comprehensive test device based on the injector inlet pressure and the flow of the externally-injected gas, wherein the injection performance parameter comprises at least one of circulation injection amount and injection response time.
7. The integrated test device for the common rail system of the engine according to claim 1, wherein the gas outputted from the gas supply system is outputted to the first switching valve after the pressure of the pressure regulating system is regulated, and if the control unit controls the first switching valve to be in an open state, the gas in the first switching valve directly flows into the pressure stabilizing tank through the gas pipe, and the gas in the pressure stabilizing tank is outputted to the back pressure valve after being stabilized by the back pressure valve, and is discharged to the outside through the back pressure valve.
8. The comprehensive test device for the engine common rail system according to claim 1, wherein the comprehensive test device for the engine common rail system further comprises a security system, wherein the security system comprises a gas leakage detector and an alarm, wherein the gas leakage detector is used for monitoring the concentration of gas, and the gas leakage detector and the alarm are respectively connected with the control unit;
the control unit acquires the concentration of the gas output by the gas leakage detector, and controls the alarm to alarm when the concentration of the gas reaches a gas concentration threshold.
9. The integrated test device for the common rail system of the engine according to claim 8, further comprising a second switching valve arranged on the common rail pipe, wherein the control unit is further used for turning off an electric control pressure regulating valve in the pressure regulating system and opening the second switching valve when determining that the concentration of the gas output by the gas leakage detector reaches a gas concentration threshold value, so that the gas output by the pressure regulating system is discharged through the second switching valve.
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| CA2794117C (en) * | 2012-10-31 | 2013-11-12 | Westport Power Inc. | Method and system for detecting and diagnosing a gaseous fuel leak in a dual fuel internal combustion engine system |
| CN103364661A (en) * | 2013-07-09 | 2013-10-23 | 镇江恒驰科技有限公司 | Device for testing performance of natural gas injection electromagnetic valve and testing method of device |
| CN109186981A (en) * | 2018-09-18 | 2019-01-11 | 上海工程技术大学 | A kind of high-power nozzle group valve discharge characteristic is test bed |
| CN111997765B (en) * | 2020-09-01 | 2023-04-18 | 潍柴动力股份有限公司 | Injection control method and device applied to gas supply system of natural gas engine |
| CN113738551B (en) * | 2021-09-27 | 2024-05-24 | 嘉兴依相动力科技有限公司 | High-efficiency testing system and method for fuel gas common rail injection |
| CN216691309U (en) * | 2021-09-27 | 2022-06-07 | 嘉兴依相动力科技有限公司 | High-efficient testing arrangement of gas common rail injection |
| CN116220983B (en) * | 2023-03-20 | 2024-06-04 | 一汽解放汽车有限公司 | Injector testing system and testing method |
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| US5819708A (en) * | 1996-01-23 | 1998-10-13 | C.R.F. Societa Consortile Per Azioni | Fuel retaining and collecting structure for an internal combustion engine high-pressure injection system |
| CN209586569U (en) * | 2018-11-22 | 2019-11-05 | 英嘉动力科技无锡有限公司 | A kind of novel natural gas the amount of injection test device |
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