Engine common rail system comprehensive test device

Abstract

The present application relates to a comprehensive test device for an engine common rail system. The comprehensive test device for an engine common rail system 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 to the air supply system, the pressure regulating system, the first switching valve and the injection system; the gas output by the air supply system flows to the pressure regulating system via the air pipe, and after pressure regulation in the pressure regulating system, flows to the injection system through the first switching valve and the common rail pipe, and in the injection system, the injection system regulates the flow rate and then injects it to the outside; the control unit is used to regulate the pressure of the gas output by the air supply system, the pressure of the gas output by the pressure regulating system, and the flow rate of the gas output by the injection system based on preset target parameters. The use of this method can improve the working efficiency of the comprehensive test device for an engine common rail system.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a comprehensive test device for an engine common rail system. Background Art

[0002] With the development of automobile technology, hydrogen engines have a wide range of applications in the field of high-power engines. The common rail hydrogen injection system has been deeply recognized by the mainstream market for its unique advancement. It mainly forms an intelligent system that can control the rail pressure in real time and realize closed loop through the electronically controlled pressure regulating valve, pressure sensor, rail, injector and controller. The hydrogen common rail injection system can adjust the common rail pressure in real time and accurately to control the engine injection output, and can realize multi-cylinder injection law and injection consistency verification more accurately and efficiently.

[0003] At present, in the field of hydrogen common rail injection system test research technology, since the research and development of hydrogen injectors and hydrogen electronically controlled pressure regulating valves are in the initial stage, the relevant testing capabilities are also mainly concentrated on the injection rate test of a single gas injector and the pressure regulation characteristic test of a single pressure regulating valve. There are few testing platforms for key components of hydrogen engine hydrogen systems that can carry out real-time control and precise regulation of different modules such as gas supply, pressure regulation and injection. Summary of the invention

[0004] Based on this, it is necessary to provide an engine common rail system comprehensive test device that can improve the working efficiency of the engine common rail system comprehensive test device in response to the above technical problems.

[0005] In a first aspect, the present application provides a comprehensive test device for an engine common rail system, the device 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 to the air supply system, the pressure regulating system, the first switching valve and the injection system;

[0006] The gas outputted by the gas supply system flows to the pressure regulating system via the gas pipe, and after pressure regulation in the pressure regulating system, flows to the injection system through the first switching valve and the common rail pipe, and in the injection system, the gas is injected to the outside after flow regulation by the injection system;

[0007] The control unit is used to adjust 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 rate of the gas output by the injection system based on preset target parameters.

[0008] In one embodiment, the gas supply system includes a high-pressure gas cylinder, a pressure reducing valve and a temperature regulator; the pressure reducing valve is connected to the control unit;

[0009] The gas output from the high-pressure gas cylinder passes through the pressure reducing valve, is reduced in pressure by the pressure reducing valve, and then is output to the temperature regulator; the temperature regulator adjusts the temperature of the gas output from the pressure reducing valve, and then the gas flows to the pressure regulating system through the gas pipe;

[0010] The control unit is used to adjust the opening of the pressure reducing valve based on a preset target output pressure of the pressure reducing valve, so as to adjust the pressure of the gas output by the pressure reducing valve.

[0011] In one embodiment, the pressure regulating system includes an electrically controlled stop valve and an electrically controlled pressure regulating valve; the electrically controlled stop valve and the electrically controlled pressure regulating valve are respectively connected to the control unit;

[0012] The control unit is used to control the electronically controlled stop valve to be in a passage state and control the first switching valve to be in a closed state; based on a preset target rail pressure, control the opening of the electronically controlled pressure regulating valve so that the gas output by the air supply system is pressure-regulated by the electronically controlled pressure regulating valve and then output to the first switching valve.

[0013] In one embodiment, the engine common rail system comprehensive test device further includes a temperature and pressure sensor disposed between the electronically controlled shut-off valve and the electronically controlled pressure regulating valve; the temperature and pressure sensor is connected to the control unit;

[0014] The temperature and pressure sensor is used to monitor the pressure regulating valve inlet pressure of the electronically controlled pressure regulating valve and send the pressure regulating valve inlet pressure to the control unit;

[0015] The control unit is used to obtain the pressure regulating valve inlet pressure sent by the temperature and pressure sensor, and control the opening of the electronically controlled pressure regulating valve based on the preset target rail pressure and the pressure regulating valve inlet pressure.

[0016] In one of the embodiments, the engine common rail system comprehensive test device also includes a second switching valve arranged on the common rail pipe; the control unit is also used to control the electronically controlled stop valve to be in a passage state, control the first switching valve to be in a closed state, and control the second switching valve to be in a closed state, and control the opening of the electronically controlled pressure regulating valve in sequence according to a preset opening gradient while controlling the internal pressure of the injection system to remain unchanged.

[0017] In one embodiment, the injection system includes a pressure stabilizing tank, a back pressure valve and at least one injector, and the injector is provided with an adapter; the pressure stabilizing tank is used to stabilize the outlet pressure fluctuation when injecting to the outside; the back pressure valve is used to control the internal pressure of the pressure stabilizing tank; the back pressure valve and the injector are respectively connected to the control unit;

[0018] The gas output by the air supply system is output to the first switching valve after being pressure-regulated by the pressure regulating system. 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 control unit drives at least one injector to work based on the target driving pulse width, and the gas output by the injector working under the target driving pulse width flows into the pressure stabilizing tank through the adapter, and is output to the back pressure valve after the gas in the pressure stabilizing tank is pressure-stabilized by the back pressure valve, and is ejected to the outside through the back pressure valve.

[0019] In one embodiment, the device further includes a pressure sensor disposed between the common rail pipe and the injector and connected to the injector correspondingly, and a flow meter connected to the back pressure valve;

[0020] The pressure sensor is used to monitor the injector inlet pressure of the corresponding injector when the control unit drives the injector to work based on the target driving pulse width, and send the injector inlet pressure to the control unit;

[0021] The flow meter is used to monitor the flow rate of the gas sprayed to the outside and send the flow rate of the gas sprayed to the outside to the control unit;

[0022] The control unit is used to receive the injector inlet pressure sent by the pressure sensor, and receive the flow rate of the gas injected to the outside sent by the flow meter, and obtain the injection performance parameters of the engine common rail system comprehensive test device based on the injector inlet pressure and the flow rate of the gas injected to the outside, wherein the injection performance parameters include at least one of a cyclic injection volume and an injection response time.

[0023] In one embodiment, the gas output by the gas supply system is output to the first switching valve after being pressure-regulated by the pressure regulating system. 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 air pipe, and is output to the back pressure valve after the gas in the pressure stabilizing tank is pressure-stabilized by the back pressure valve, and is sprayed to the outside through the back pressure valve.

[0024] In one embodiment, the engine common rail system comprehensive test device further includes a security system; the security system includes a gas leakage detector and an alarm; the gas leakage detector is used to monitor the concentration of the gas; the gas leakage detector and the alarm are respectively connected to the control unit;

[0025] The control unit obtains the concentration of the gas output by the gas leakage detector, and controls the alarm to sound an alarm when the concentration of the gas reaches a gas concentration threshold.

[0026] In one of the embodiments, the engine common rail system comprehensive test device also includes a second switching valve arranged on the common rail pipe; when the control unit determines that the concentration of the gas output by the gas leakage detector reaches the gas concentration threshold, it is also used to shut off the electronically controlled pressure regulating valve in the pressure regulating system and open the second switching valve to allow the gas output by the pressure regulating system to be discharged through the second switching valve.

[0027] The above-mentioned engine common rail system comprehensive test device includes 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 connected to the air supply system, the pressure regulating system and the injection system respectively; the gas output by the air supply system flows to the pressure regulating system via the air pipe, and after pressure regulation in the pressure regulating system, flows to the injection system through the first switching valve and the common rail pipe, and in the injection system, the injection system is flow-regulated and then injected to the outside; the control unit is used to adjust the pressure of the gas output by the air 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. By integrating the engine common rail system comprehensive test device with the air supply system, the pressure regulating system, the injection system and the control unit, the flexibility of equipment control can be enhanced, and the control unit can regulate the air supply system, the pressure regulating system and the injection system respectively based on the preset target parameters, thereby improving the working efficiency of the engine common rail system comprehensive test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a block diagram of the composition of a comprehensive test device for an engine common rail system in one embodiment;

[0030] Figure 2 It is a block diagram of the composition of a comprehensive test device for an engine common rail system in another embodiment;

[0031] Figure 3 It is a structural block diagram of a comprehensive test device for an engine common rail system in one embodiment. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0036] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0037] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0038] In one embodiment, Figure 1As shown, the engine common rail system comprehensive test device includes 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 to the air supply system, the pressure regulating system, the first switching valve and the injection system; the gas output by the air supply system flows to the pressure regulating system via the air pipe, and after pressure regulation in the pressure regulating system, flows to the injection system through the first switching valve and the common rail pipe, and in the injection system, the injection system adjusts the flow rate and then injects it to the outside; the control unit is used to adjust the pressure of the gas output by the air supply system, the pressure of the gas output by the pressure regulating system, and the flow rate of the gas output by the injection system based on preset target parameters.

[0039] Among them, the gas supply system can be a system for providing gas with a certain pressure, temperature and flow rate, wherein the gas can be hydrogen or other types of gas. The pressure regulating system can be a system for regulating the pressure of the gas, and the pressure of the gas can be accurately adjusted through the pressure regulating system. The injection system can accurately control the injection flow rate. The control unit can be connected to the gas supply system, the pressure regulating system, the first switching valve and the injection system respectively. The control unit can adopt a control mainboard, and the control mainboard can be provided with devices such as CPU (Central Processing Unit, central processing unit), MCU (MicroControl Unit, micro control unit). The control unit can control the gas supply system, the pressure regulating system, the first switching valve and the injection system respectively. Among them, the control unit can be integrated with a data acquisition unit, which is used to process and analyze the collected data and output it according to the specified template. Of course, the data acquisition unit can also be independent of the control unit.

[0040] The preset target parameter may be the set index that the air supply system, the pressure regulating system and the injection system need to achieve respectively. For the air supply system, the corresponding preset target parameter may be the target gas pressure that the air supply system needs to output, for the pressure regulating system, the corresponding preset target parameter may be the target rail pressure that needs to be achieved, and for the injection system, the corresponding preset target parameter may be the injection flow rate.

[0041] Specifically, the gas output by the air supply system passes through the air pipe to the pressure regulating system. After the pressure is adjusted by the pressure regulating system, the gas flows to the common rail pipe through the air pipe, and the common rail pipe is connected to the injection system through the air pipe. The control unit is connected to 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 meet the working requirements of the air supply system, the pressure regulating system, the first switching valve and the injection system.

[0042] The above-mentioned engine common rail system comprehensive test device includes 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 connected to the air supply system, the pressure regulating system and the injection system respectively; the gas output by the air supply system flows to the pressure regulating system via the air pipe, and after pressure regulation in the pressure regulating system, flows to the injection system through the first switching valve and the common rail pipe, and in the injection system, the injection system is flow-regulated and then injected to the outside; the control unit is used to adjust the pressure of the gas output by the air 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. By integrating the engine common rail system comprehensive test device with the air supply system, the pressure regulating system, the injection system and the control unit, the flexibility of equipment control can be enhanced, and the control unit can regulate the air supply system, the pressure regulating system and the injection system respectively based on the preset target parameters, thereby improving the working efficiency of the engine common rail system comprehensive test device.

[0043] In one embodiment, the gas supply system includes a high-pressure gas cylinder, a pressure reducing valve and a temperature regulator; the pressure reducing valve is connected to a control unit; the gas output from the high-pressure gas cylinder passes through the pressure reducing valve, is reduced in pressure by the pressure reducing valve and then output to the temperature regulator; the temperature regulator adjusts the temperature of the gas output from the pressure reducing valve and then flows to the pressure regulating system through the gas pipe; the control unit is used to adjust the opening of the pressure reducing valve based on a preset pressure reducing valve target output pressure so as to adjust the pressure of the gas output from the pressure reducing valve.

[0044] Among them, the high-pressure gas cylinder stores gas, the pressure reducing valve can adjust the pressure of the gas output from the high-pressure gas cylinder, and the temperature regulator can adjust the temperature of the gas output from the pressure reducing valve. The preset pressure reducing valve target output pressure can be the pressure that the gas to be output needs to reach after the gas passes through the pressure reducing valve, and the preset pressure reducing valve target output pressure can correspond to the opening of the pressure reducing valve. Generally, the pressure of the output gas can be reduced from high-pressure gas to medium-pressure state through the pressure reducing valve, and the pressure of the gas output through the pressure reducing valve can be maintained at about 40~60bar.

[0045] Specifically, in the gas supply system, the gas in the high-pressure gas cylinder, such as hydrogen, is decompressed through a pressure reducing valve. The control unit can control the opening of the pressure reducing valve to achieve the decompression effect, and then the gas is temperature-adjusted by a temperature regulator and output through the gas pipe.

[0046] In this embodiment, the pressure and temperature of the output gas can be kept constant through the gas supply system, thereby improving the reliability of the engine common rail system comprehensive test device.

[0047] In one embodiment, the pressure regulating system includes an electronically controlled stop valve and an electronically controlled pressure regulating valve; the electronically controlled stop valve and the electronically controlled pressure regulating valve are respectively connected to a control unit; the control unit is used to control the electronically controlled stop valve to be in a passage state and to control the first switching valve to be in a closed state; based on a preset target rail pressure, the opening of the electronically controlled pressure regulating valve is controlled so that the gas output by the gas supply system is output to the first switching valve after being pressure-regulated by the electronically controlled pressure regulating valve.

[0048] Among them, the electronically controlled stop valve and the first switching valve can be used to realize the switching of different test functions, and the control unit can realize the opening and closing of the gas circuit by controlling the opening and closing of the electronically controlled stop valve and the first switching valve. The electronically controlled pressure regulating valve refers to a valve used to regulate pressure, and specifically, it can be achieved by adjusting the valve opening of the electronically controlled pressure regulating valve to achieve different rail pressure outputs. The electronically controlled stop valve is in a passage state, which means that the gas circuit is in an open state, and the gas output from the gas supply system can flow into the electronically controlled pressure regulating valve. The control unit can realize various test functions by controlling the gas circuit, such as the switching of the injector test function and the electronically controlled pressure regulating valve test function. The preset target rail pressure can refer to the rail pressure required for different engine operating conditions that need to be simulated in advance, and the preset target rail pressure can correspond to the opening of the electronically controlled pressure regulating valve. The control unit can achieve different rail pressure outputs by controlling the opening of the electronically controlled pressure regulating valve.

[0049] Specifically, after the hydrogen in the high-pressure gas cylinder passes through the pressure reducing valve and the temperature regulator, it is connected to the electronically controlled stop valve through the gas pipe. The electronically controlled stop valve controls the on-off of the gas circuit. The electronically controlled stop valve is connected to the electronically controlled pressure regulating valve through the gas pipe. The electronically controlled pressure regulating valve regulates the pressure of the gas and then outputs it to the first switching valve.

[0050] In this embodiment, the control unit can control the opening of the electronically controlled pressure regulating valve according to different engine operating conditions that need to be simulated, thereby improving control accuracy.

[0051] In one embodiment, the engine common rail system comprehensive test device also includes a temperature and pressure sensor arranged between the electronically controlled stop valve and the electronically controlled pressure regulating valve; the temperature and pressure sensor is connected to the control unit; the temperature and pressure sensor is used to monitor the pressure regulating valve inlet pressure of the electronically controlled pressure regulating valve and send the pressure regulating valve inlet pressure to the control unit; the control unit is used to obtain the pressure regulating valve inlet pressure sent by the temperature and pressure sensor, and control the opening of the electronically controlled pressure regulating valve based on the preset target rail pressure and the pressure regulating valve inlet pressure.

[0052] Among them, the temperature and pressure sensor may refer to a sensor that integrates temperature testing function and pressure testing function, and the pressure regulating valve inlet pressure refers to the pressure when the gas is input into the electronically controlled pressure regulating valve. The temperature and pressure sensor is arranged between the electronically controlled stop valve and the electronically controlled pressure regulating valve, and can be used to measure the pressure regulating valve inlet pressure of the electronically controlled pressure regulating valve through the temperature and pressure sensor. The control unit can obtain the pressure regulating valve inlet pressure sent by the temperature and pressure sensor, and control the opening of the electronically controlled pressure regulating valve based on the preset target rail pressure and the pressure regulating valve inlet pressure.

[0053] In this embodiment, the control unit obtains the system pressure regulating valve inlet pressure monitored by the temperature and pressure sensor, and performs opening control of the electronically controlled pressure regulating valve according to the preset target rail pressure of the engine and the pressure regulating valve inlet pressure that need to be simulated, thereby improving control performance and control reliability.

[0054] In one embodiment, the engine common rail system comprehensive test device also includes a second switching valve arranged on the common rail pipe; the control unit is also used to control the electronically controlled stop valve to be in a passage state, control the first switching valve to be in a closed state, and control the second switching valve to be in a closed state; the control unit is also used to control the opening of the electronically controlled pressure regulating valve in sequence according to a preset opening gradient while controlling the internal pressure of the injection system to remain unchanged.

[0055] Among them, the control unit can set the electronically controlled 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, that is, open the electronically controlled stop valve, and close the first switching valve and the second switching valve. This can be called the electronically controlled pressure regulating valve working mode. When the electronically controlled 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 regulating tank of the injection system is stabilized at different target values. Further, the control unit can control the opening of the electronically controlled pressure regulating valve in sequence according to the preset opening gradient. The opening of the electronically controlled pressure regulating valve can be determined according to the size of the driving current that drives the electronically controlled pressure regulating valve. Therefore, its driving current can be changed from small to large. At this time, the flow rate of the gas passing through the electronically controlled pressure regulating valve also changes from small to large. The control unit can obtain the relationship curve between the driving current and the gas flow rate, thereby obtaining the performance characteristics of the electronically controlled pressure regulating valve, recording the test results and generating a report to evaluate the performance of the electronically controlled pressure regulating valve.

[0056] In this embodiment, when the electronically controlled pressure regulating valve is in working mode, the measurement and control unit controls the back pressure valve of the injection system so that the pressure of the pressure regulating tank of the injection system is stabilized at different target values. At this time, since the injection system adopts an outward-opening injector, the injection system is not working, and the pressure in the pressure regulating tank causes the injector to be in a closed state, thereby obtaining the performance characteristics of the electronically controlled pressure regulating valve.

[0057] In one embodiment, the injection system includes a pressure stabilizing tank, a back pressure valve and at least one injector, and the injector is provided with an adapter correspondingly; the pressure stabilizing tank is used to stabilize the outlet pressure fluctuation when injecting to the outside; the back pressure valve is used to control the internal pressure of the pressure stabilizing tank; the back pressure valve and the injector are respectively connected to the control unit;

[0058] The gas output by the air supply system is output to the first switching valve after being pressure-regulated by the pressure regulating system. 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 control unit drives at least one injector to work based on the target driving pulse width, and the gas output by the injector working under the target driving pulse width flows into the pressure regulating tank through the adapter, and is output to the back pressure valve after the gas in the pressure regulating tank is pressure-stabilized by the back pressure valve, and is ejected to the outside through the back pressure valve.

[0059] Among them, the pressure regulator is used to stabilize the outlet pressure fluctuation to ensure a stable flow meter reading; the back pressure valve is used to control the pressure in the pressure regulator. The back pressure regulating valve is a PID (proportional integral differential) closed-loop pressure regulating valve controlled by the controller of the measurement and control system, which can always ensure that the pressure in the adapter is stable near the target value. The injector is used to inject gas into the adapter. The common rail pipe can refer to the gas rail connecting the gas supply system and the injection system.

[0060] Specifically, the gas output by the gas supply system is output to the first switching valve after pressure regulation by the pressure regulating system. 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 passes through the pressure regulating tank and then flows to the atmosphere. There is a back pressure valve behind the pressure regulating tank. The back pressure valve controls the pressure in the pressure regulating tank through the control unit to control the back pressure valve, so that the pressure in the pressure regulating tank is maintained at about 3 bar, which is used to simulate the cylinder pressure in the working state of the engine.

[0061] In one embodiment, the gas output by the gas supply system is output to the first switching valve after the pressure regulating system regulates the pressure, and the first switching valve is controlled to be in a closed state, and an injector is driven to work at the same time, and the injector driving current is changed to perform the test. At this time, the control unit can collect the injector driving current signal, the inlet pressure fluctuation, and the flow value of the outlet flow meter, and automatically analyze and obtain the injector opening delay time, closing delay time, injector duration, single injection amount, and record the test results; referring to the above process, the performance of multiple injectors can be tested in sequence, and finally the results of 6 injectors are displayed to generate a test report.

[0062] In one embodiment, the gas output by the gas supply system is output to the first switching valve after pressure regulation by the pressure regulating system, and the first switching valve is controlled to be in a closed state, and six injectors are driven to work simultaneously according to the set working conditions, and the flow of the outlet flow meter is monitored at the same time. When the flow exceeds the set value, the system alarms.

[0063] In one embodiment, the device also includes a pressure sensor arranged 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 to monitor the injector inlet pressure of the corresponding injector when the control unit drives the injector to work based on the target drive pulse width, and send the injector inlet pressure to the control unit; the flow meter is used to monitor the flow rate of the gas injected to the outside, and send the flow rate of the gas injected to the outside to the control unit; the control unit is used to receive the injector inlet pressure sent by the pressure sensor, and receive the flow rate of the gas injected to the outside sent by the flow meter, and based on the injector inlet pressure and the flow rate of the gas injected to the outside, obtain the injection performance parameters of the engine common rail system comprehensive test device, the injection performance parameters including at least one of the cyclic injection volume and the injection response time.

[0064] Among them, the flowmeter is used to measure the flow of gas when the injection system is working. There is a back pressure regulating valve behind the pressure regulating tank. The back pressure regulating valve controls the pressure in the pressure regulating tank through the measurement and control system, so that the pressure in the pressure regulating tank is maintained at about 3 bar, which is used to simulate the cylinder pressure of the engine working state. The back pressure regulating valve is used to adjust the back pressure in the adapter according to the flow change. In the injection system, there is a pressure sensor at the inlet of the injector, which is used to detect the inlet pressure fluctuation when a single injector is working, obtain the response time of a single injector, and combine the test results of the flowmeter to infer the cyclic injection volume.

[0065] In one embodiment, the gas output by the gas supply system is output to the first switching valve after being pressure-regulated by the pressure regulating system. 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 air pipe, and is output to the back pressure valve after the gas in the pressure stabilizing tank is pressure-stabilized by the back pressure valve, and is sprayed to the outside through the back pressure valve.

[0066] When the first switching valve is opened, the gas flows directly into the pressure regulating tank through the electronically controlled pressure regulating valve. Since the injection system adopts an externally opened injector, the injection system does not work, and the pressure in the pressure regulating tank makes the injector in a closed state. At this time, the electronically controlled pressure regulating valve test system is isolated from the injector system. A pressure sensor can be installed on the pressure regulating tank. The back pressure valve after the pressure regulating tank is used to control the back pressure in the pressure regulating tank, and the flow meter is used to measure the gas flow through the electronically controlled pressure regulating valve.

[0067] In one embodiment, the engine common rail system comprehensive test device also includes a security system; the security system includes a gas leak detector and an alarm; the gas leak detector is used to monitor the concentration of the gas; the gas leak detector and the alarm are respectively connected to the control unit; the control unit obtains the concentration of the gas output by the gas leak detector, and when the concentration of the gas reaches a gas concentration threshold, the alarm is controlled to alarm.

[0068] Among them, the security system includes a gas leak detector and an alarm. The gas leak detector is used to monitor the gas leakage in the test bench, such as the leakage of hydrogen. The gas concentration threshold is a threshold set to determine whether to alarm. The gas leak detector can send the current acquired gas concentration to the control unit, and the control unit determines whether the gas concentration reaches the gas concentration threshold. When the gas concentration threshold is reached, the control unit can control the alarm to alarm to prompt the user, thereby improving safety.

[0069] In one embodiment, when the control unit determines that the concentration of the gas output by the gas leakage detector reaches the gas concentration threshold, it is also used to shut off the electronically controlled pressure regulating valve in the pressure regulating system and open the second switching valve to allow the gas output by the pressure regulating system to be discharged through the second switching valve.

[0070] Among them, when the control unit determines that the concentration of the gas output by the gas leak detector reaches the gas concentration threshold, it can also close the electronically controlled pressure regulating valve of the pressure regulating system so that the gas cannot be output from the pressure regulating system, and at the same time open the second switching valve to allow the gas previously output by the pressure regulating system to be discharged through the second switching valve.

[0071] In one embodiment, Figure 2 As shown, the present embodiment provides a comprehensive test bench for a hydrogen common rail system, including 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. Figure 3 Hydrogen injector performance and reliability testing shown.

[0072] In the gas supply system, the hydrogen in the high-pressure gas cylinder 1 passes through the pressure reducing valve 2 and the temperature regulator 3, and is then connected to the electric-controlled stop valve 4 through the gas pipe, and the electric-controlled stop valve 4 controls the on-off of the gas circuit; the electric-controlled stop valve 4 is connected to the electric-controlled pressure regulating valve 5 through the gas pipe, and a pressure sensor P1 and a temperature sensor T1 are arranged in front of the electric-controlled pressure regulating valve 5; when the switching valve 15 is closed, the electric-controlled pressure regulating valve 5 flows to the gas rail 6 through the gas pipe, and the gas rail 6 is equipped with a pressure sensor P4 and a temperature sensor T4. One path of the gas rail 6 flows to the injector 8 through the gas pipe, and a high-frequency pressure sensor P2 is arranged at the inlet of the injector 8 to detect the pressure fluctuation at the injector inlet. The injector 8 is installed on the adapter 9, and the adapter 9 is connected to the pressure-surge tank 10 through the air pipe. The volume of the pressure-surge tank 10 is 500 times that of the adapter 9, which is used to reduce the outlet pressure fluctuation caused by injection. The outlet of the adapter 9 is equipped with a pressure sensor P3 for monitoring the injection back pressure. The outlet of the pressure-surge tank 10 is equipped with a back pressure regulating valve 11 for controlling the pressure in the cavity of the adapter 9. The gas flows out through the outlet of the back pressure regulating valve 11 through the flow meter 12. The flow meter 12 is a mass flow meter that can measure the average flow of multiple injections. There is another way on the gas rail 6, which discharges the gas in the gas rail through the switching valve 7.

[0073] When performing an injector multi-cylinder consistency test, click Figure 3 Button "Multi-cylinder consistency test" (such as Figure 2 As shown), open the electronically controlled stop valve 4, close the switching valve 7, the measurement and control system controls the pressure of the gas rail 6 by controlling the opening of the electronically controlled pressure regulating valve 5, and controls the six injectors 8 to work simultaneously. The data acquisition and control system automatically collects the pressure fluctuation of the injector inlet, and automatically analyzes the consistency of the pressure fluctuation of each cylinder inlet, and determines whether the injection amount of the six injectors is consistent. If the characteristics of the six injectors are consistent, the interface displays "pass", and if the characteristics of the six injectors are inconsistent, the interface displays "faulty injector cylinder number" and sends an alarm signal.

[0074] When performing a single injection characteristic test of the injector, click Figure 3 The button "Injection Characteristics Test" is shown, opens the electronically controlled stop valve 4, closes the switching valve 7, and the measurement and control system controls the pressure of the gas rail 6 by controlling the electronically controlled pressure regulating valve 5, and drives an injector to work at the same time, changes the injector driving current, and performs the test. At this time, the data acquisition and control system collects the injector driving current signal, the inlet pressure fluctuation, and the flow value of the outlet flow meter, and automatically analyzes it to obtain the injector opening delay time, closing delay time, injector duration, single injection volume, and record the test results; referring to the above process, test the performance of the 6 injectors in sequence, and finally display the results of the 6 injectors to generate a test report.

[0075] To perform injector reliability test, click Figure 3The button "Reliability Test" shown opens the electronically controlled stop valve 4 and closes the switching valve 7. The measurement and control system controls the pressure of the gas rail 6 to 30 bar by controlling the electronically controlled pressure regulating valve 5, and drives the six injectors to work simultaneously according to the set working conditions. At the same time, the flow of the outlet flow meter 12 is monitored. When the flow exceeds the set value, the system alarms. Then the "Injection Characteristics Test" is automatically started to test the performance of a single injector, determine the faulty parts, and the test ends. The electronically controlled pressure regulating valve 5 is closed and the injector is closed.

[0076] When the gas leakage detector 14 detects a gas leakage during the test, the security system is activated, the electric control stop valve 4 is closed, the switching valve 7 is opened, and the excess gas in the system is discharged for maintenance.

[0077] The present embodiment provides a comprehensive test bench for a hydrogen common rail system, including a gas 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 performance test of the hydrogen electric pressure regulating valve can be realized by using this comprehensive test bench. In the gas supply system, the hydrogen in the high-pressure gas cylinder 1 passes through the pressure reducing valve 2 and the temperature regulator 3, and is connected to the electric control stop valve 4 through the air pipe, and the electric control stop valve 4 controls the on-off of the gas circuit; the electric control stop valve 4 is connected to the electric control pressure regulating valve 5 through the air pipe, and the electric control pressure regulating valve 5 is provided with a pressure sensor P1 and a temperature sensor T1; when the switching valve 15 is opened, the gas passes through the electric control pressure regulating valve 5 and flows to the pressure regulating tank 10, and the pressure regulating tank 10 is equipped with a pressure sensor P3. The back pressure valve after the pressure regulating tank 10 is used to control the back pressure in the pressure regulating tank, and the flowmeter 12 is used to measure the gas flow through the electric control pressure regulating valve. Since the injectors 8 are all outward-opening injectors, when the electronically controlled 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 this time, since the injection system adopts an outward-opening injector, the injection system does not work, and the pressure in the pressure regulating tank makes the injector in a closed state. At this time, the electronically controlled pressure regulating valve test system is isolated from the injector system.

[0078] When testing the performance of the electronically controlled pressure regulating valve, click Figure 3 The button "Performance Test" is shown, set the pressure after the pressure reducing valve 2 to 40bar, open the electronically controlled stop valve 4, close the switching valve 7, and the measurement and control system controls the back pressure valve to control the pressure in the pressure regulating tank, such as 10bar, 20bar, and 30bar. Keep the pressure of the pressure regulating tank at a certain pressure, control the electronically controlled pressure regulating valve 5, and change its driving current from small to large. At this time, the flow through the electronically controlled pressure regulating valve 5 also changes from small to large. The data acquisition and processing system collects the relationship curve between the driving current and the gas flow, thereby obtaining the performance characteristics of the electronically controlled pressure regulating valve, recording the test results and generating a report to evaluate the performance of the electronically controlled pressure regulating valve.

[0079] When conducting reliability test on electronically controlled pressure regulating valve, click Figure 3The button "Reliability Test" is shown, the electric control stop valve 4 is opened, the switching valve 7 is closed, the measurement and control system sets the test conditions, controls the action of the electric control pressure regulating valve, and performs a cycle test. Every 2 hours, the "Performance Test" is automatically started to perform a self-test of the pressure regulating valve performance. When an abnormality occurs, an alarm is sounded and the machine is shut down, and process data is recorded.

[0080] When the gas leakage detector 14 detects a gas leakage during the test, the security system is activated, the electric control stop valve 4 is closed, the electric control stop valve 4 is opened, the excess gas in the system is discharged, and maintenance is carried out.

[0081] In the gas supply system, the hydrogen in the high-pressure gas cylinder 1 passes through the pressure reducing valve 2 and the temperature regulator 3, and is connected to the electric-controlled stop valve 4 through the gas pipe, and the electric-controlled stop valve 4 controls the on-off of the gas circuit; the electric-controlled stop valve 4 is connected to the electric-controlled pressure regulating valve 5 through the gas pipe, and the pressure sensor P1 and the temperature sensor T1 are arranged in front of the electric-controlled pressure regulating valve 5; the electric-controlled pressure regulating valve 5 flows to the gas rail 6 through the gas pipe, and the gas rail 6 is equipped with a pressure sensor P4 and a temperature sensor T4. There is another way on the gas rail 6, which is discharged through the switching valve 7. The gas rail 6 flows to the injector 8 through the gas pipe, and a high-frequency pressure sensor P2 is arranged at the inlet of the injector 8 to detect the pressure fluctuation at the inlet of the injector. The injector 8 is installed on the adapter 9, and the adapter 9 is connected to the pressure-surge tank 10 through an air pipe. The volume of the pressure-surge tank 10 is 500 times that of the adapter 9, which is used to reduce the outlet pressure fluctuation; the outlet of the adapter 9 is provided with a pressure sensor P3 for monitoring the injection back pressure; the outlet of the pressure-surge tank 10 is provided with a back pressure regulating valve 11 for controlling the pressure in the cavity of the adapter 9; the gas passes through the outlet of the back pressure regulating valve 11 and flows out through the flow meter 12, and the flow meter 12 is a mass flow meter that can measure the average flow rate of multiple injections.

[0082] When conducting hydrogen common rail system reliability test, click Figure 3 Click the button "System Reliability Test" to open the electronically controlled stop valve 4, close the switching valve 7, set the test conditions for the measurement and control system to perform a cycle test, and monitor the flow rate of the flow meter 13 and the pressure fluctuation of the gas rail 6 at the same time. When an abnormality occurs, an alarm will be issued to shut down the machine. Switch to the injector performance test and electronically controlled pressure regulating valve performance test programs as needed to determine the cause of the fault.

[0083] When the gas leakage detector 14 detects a gas leakage during the test, the security system is activated, the electric control stop valve 4 is closed, the electric control stop valve 4 is opened, the excess gas in the system is discharged, and maintenance is carried out.

[0084] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A comprehensive test device for engine common rail system, characterized in that: The device 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 connected to the air supply system, the pressure regulating system, the first switching valve and the injection system respectively; The gas outputted by the gas supply system flows to the pressure regulating system via the gas pipe, and after pressure regulation in the pressure regulating system, flows to the injection system through the first switching valve and the common rail pipe, and in the injection system, the gas is injected to the outside after flow regulation by the injection system; The control unit is used to adjust 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 rate of the gas output by the injection system based on preset target parameters; The injection system includes a pressure stabilizing tank, a back pressure valve and at least one injector, and the injector is provided with an adapter; the pressure stabilizing tank is used to stabilize the outlet pressure fluctuation when injecting to the outside; the back pressure valve is used to control the internal pressure of the pressure stabilizing tank; the back pressure valve and the injector are respectively connected to the control unit; The gas output by the gas supply system is output to the first switching valve after being pressure-regulated by the pressure regulating system. 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 control unit drives at least one injector to work based on the target driving pulse width, and the gas output by the injector working under the target driving pulse width flows into the pressure stabilizing tank through the adapter, and is output to the back pressure valve after the gas in the pressure stabilizing tank is pressure-stabilized by the back pressure valve, and is ejected to the outside through the back pressure valve; The control unit is also used to control the gas circuit to realize the injector test function, the electronically controlled pressure regulating valve test function and the hydrogen common rail system test function.

2. The engine common rail system comprehensive test device according to claim 1, characterized in that: The gas supply system includes a high-pressure gas cylinder, a pressure reducing valve and a temperature regulator; the pressure reducing valve is connected to the control unit; The gas output from the high-pressure gas cylinder passes through the pressure reducing valve, is reduced in pressure by the pressure reducing valve, and then is output to the temperature regulator; the temperature regulator adjusts the temperature of the gas output from the pressure reducing valve, and then the gas flows to the pressure regulating system through the gas pipe; The control unit is used to adjust the opening of the pressure reducing valve based on a preset target output pressure of the pressure reducing valve, so as to adjust the pressure of the gas output by the pressure reducing valve.

3. The engine common rail system comprehensive test device according to claim 1, characterized in that: The pressure regulating system comprises an electrically controlled stop valve and an electrically controlled pressure regulating valve; the electrically controlled stop valve and the electrically controlled pressure regulating valve are respectively connected to the control unit; The control unit is used to control the electronically controlled stop valve to be in a passage state and control the first switching valve to be in a closed state; based on a preset target rail pressure, control the opening of the electronically controlled pressure regulating valve so that the gas output by the air supply system is pressure-regulated by the electronically controlled pressure regulating valve and then output to the first switching valve.

4. The engine common rail system comprehensive test device according to claim 3, characterized in that: The engine common rail system comprehensive test device further comprises a temperature and pressure sensor disposed between the electronically controlled stop valve and the electronically controlled pressure regulating valve; the temperature and pressure sensor is connected to the control unit; The temperature and pressure sensor is used to monitor the pressure regulating valve inlet pressure of the electronically controlled pressure regulating valve and send the pressure regulating valve inlet pressure to the control unit; The control unit is used to obtain the pressure regulating valve inlet pressure sent by the temperature and pressure sensor, and control the opening of the electronically controlled pressure regulating valve based on the preset target rail pressure and the pressure regulating valve inlet pressure.

5. The engine common rail system comprehensive test device according to claim 3, characterized in that: The engine common rail system comprehensive test device also includes a second switching valve arranged on the common rail pipe; the control unit is also used to control the electronically controlled stop valve to be in a passage state, control the first switching valve to be in a closed state, and control the second switching valve to be in a closed state, and control the opening of the electronically controlled pressure regulating valve in sequence according to a preset opening gradient while controlling the internal pressure of the injection system to remain unchanged.

6. The engine common rail system comprehensive test device according to claim 1, characterized in that: The device further comprises a pressure sensor disposed between the common rail pipe and the injector and connected to the injector correspondingly, and a flow meter connected to the back pressure valve; The pressure sensor is used to monitor the injector inlet pressure of the corresponding injector when the control unit drives the injector to work based on the target driving pulse width, and send the injector inlet pressure to the control unit; The flow meter is used to monitor the flow rate of the gas sprayed to the outside and send the flow rate of the gas sprayed to the outside to the control unit; The control unit is used to receive the injector inlet pressure sent by the pressure sensor, and receive the flow rate of the gas injected to the outside sent by the flow meter, and obtain the injection performance parameters of the engine common rail system comprehensive test device based on the injector inlet pressure and the flow rate of the gas injected to the outside, wherein the injection performance parameters include at least one of a cyclic injection volume and an injection response time.

7. The engine common rail system comprehensive test device according to claim 1, characterized in that: The gas output by the gas supply system is output to the first switching valve after being pressure-regulated by the pressure regulating system. 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 air pipe, and is output to the back pressure valve after the gas in the pressure stabilizing tank is pressure-stabilized by the back pressure valve, and is ejected to the outside through the back pressure valve.

8. The engine common rail system comprehensive test device according to claim 1, characterized in that: The engine common rail system comprehensive test device also includes a security system; the security system includes a gas leakage detector and an alarm; the gas leakage detector is used to monitor the concentration of the gas; the gas leakage detector and the alarm are respectively connected to the control unit; The control unit obtains the concentration of the gas output by the gas leakage detector, and controls the alarm to sound an alarm when the concentration of the gas reaches a gas concentration threshold.

9. The engine common rail system comprehensive test device according to claim 8, characterized in that: The engine common rail system comprehensive test device also includes a second switching valve arranged on the common rail pipe; when the control unit determines that the concentration of the gas output by the gas leakage detector reaches the gas concentration threshold, it is also used to shut off the electronically controlled pressure regulating valve in the pressure regulating system and open the second switching valve to allow the gas output by the pressure regulating system to be discharged through the second switching valve.

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