Natural gas engine high-humidity test gas inlet control system

Abstract

The utility model provides a natural gas engine high-humidity test air inlet control system, and relates to the technical field of natural gas engines, the natural gas engine high-humidity test air inlet control system comprises a compressor and a water storage tank communicated to the exhaust end of the compressor, the water outlet end of the water storage tank is sequentially communicated with a water flow meter and a nozzle, and the air inlet end of the nozzle is communicated with an engine; and the electronic control unit of the engine is also electrically connected with the nozzle and the water flow meter. The device can control the opening and closing time of water injection at any time, improves the test efficiency, can obtain the accurate water injection amount, and improves the accuracy of test data. A standby pin in the electronic control unit of the engine is utilized, a urea nozzle and the like can be used as the nozzle, and the control device is low in development and manufacturing cost and high in practical operability.

Description

Technical Field

[0001] This application relates to the technical field of natural gas engines, and particularly to an intake control system for high-humidity tests of natural gas engines. Background Art

[0002] The main fuels of natural gas engines are liquefied natural gas (LNG) and compressed natural gas (CNG), and their main component is methane (CH4). The main products after combustion in the engine are water (H2O) and carbon dioxide (CO2). Currently, the national VI natural gas engine system mainly adopts stoichiometric combustion and exhaust gas recirculation (EGR) technology. In the EGR technology, the exhaust gas after combustion flows into the intake pipe after being cooled through an external EGR pipeline and participates in the combustion process again. The combustion exhaust gas contains a large amount of water vapor, the fresh intake air also contains a certain amount of water vapor, and there is also a small amount of water vapor in natural gas. After the water vapor in the mixture enters the combustion chamber, it will affect the working efficiency of the engine and even cause misfire.

[0003] The air humidity varies in different regions and climates, and there are differences in the quality of natural gas, which will affect the performance consistency of the engine. To improve the adaptability of engine products, it is necessary to conduct high-humidity tests of the engine on the test bench, study and develop the operation of the engine in a high-humidity environment, so as to optimize the engine performance and improve the product competitiveness.

[0004] In the high-humidity test of the engine, water needs to be added artificially to the intake pipe. To ensure accurate test data, it is necessary to invent a device that can accurately control the water volume to improve the accuracy of test data and test efficiency. Summary of the Invention

[0005] To overcome the deficiencies that the current high-humidity test of the engine requires artificial water addition to the intake pipe, resulting in low accuracy and efficiency of test data, the embodiment of this application provides an intake control system for high-humidity tests of natural gas engines, which can control the opening and closing moments of water injection at any time, improve the test efficiency, obtain accurate water injection volume, and improve the accuracy of test data.

[0006] The technical solution adopted by the embodiment of this application to solve its technical problems is: an intake control system for high-humidity tests of natural gas engines, including a compressor and a water storage tank connected to its exhaust end. The water outlet end of the water storage tank is sequentially connected with a water flow meter and a nozzle. The intake end of the nozzle is connected with the engine, and the electronic control unit of the engine is also electrically connected with the nozzle and the water flow meter.

[0007] Further, the engine is also electrically connected with a combustion analyzer for judging its misfire condition.

[0008] Further, the spare pin in the electronic control unit of the engine is connected to the nozzle.

[0009] Further, the nozzle is specifically a urea nozzle.

[0010] Further, an air pipe A is fixedly connected between the exhaust end of the compressor and the intake end of the water storage tank.

[0011] Further, a water pipe is fixedly connected between the water discharge end of the water storage tank and the water inlet of the nozzle, and the water flow meter is installed on the water pipe.

[0012] Further, an air pipe B is fixedly connected between the air inlet of the engine and the air duct inlet of the nozzle.

[0013] The advantages of the embodiments of the present application are as follows:

[0014] 1. It can control the opening and closing times of water injection at any time, improving the test efficiency;

[0015] 2. It can obtain accurate water injection volume, improving the accuracy of test data;

[0016] 3. By using the spare pin in the electronic control unit of the engine, the nozzle can use a urea nozzle, etc. The development and production cost of this control device is low and the practicality is strong. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the intake control system for the high-humidity test of a natural gas engine provided by the embodiment of the present application;

[0018] In the figure: 1 - compressor; 2 - water storage tank; 3 - water flow meter; 4 - nozzle; 5 - engine; 6 - air pipe A; 7 - water pipe; 8 - air pipe B. Specific Embodiments

[0019] The technical solution in the embodiment of the present application is to solve the problem that the accuracy and efficiency of the test data are relatively low due to the need to manually add water to the intake pipe during the high-humidity test of the current engine. The general idea is as follows:

[0020] Embodiment 1:

[0021] Please refer to Figure 1 , an intake control system for the high-humidity test of a natural gas engine, including a compressor 1 and a water storage tank 2 connected to its exhaust end. The water outlet end of the water storage tank 2 is sequentially connected to a water flow meter 3 and a nozzle 4. The intake end of the nozzle 4 is connected to an engine 5, and the electronic control unit of the engine 5 is also electrically connected to the nozzle 4 and the water flow meter 3.

[0022] In this embodiment, the compressed air discharged by the compressor 1 is connected to the water storage tank 2 to apply water pressure so that water can be ejected when the nozzle 4 is opened; the spare pin in the electronic control unit of the engine 5 is connected to the nozzle 4, and a temporary variable is newly added in the software to control the opening and closing of the nozzle 4. During the test, the nozzle 4 is controlled to open by the electronic control unit of the engine 5 until the first misfire of the engine 5 (judged by the combustion analyzer), then the nozzle 4 is closed, and at the same time, the relevant data of the engine 5 and the reading of the water flowmeter 3 are recorded. The above test is repeated 3 times under the same working conditions and the average value is taken to achieve the accuracy of the high humidity test data of the engine 5.

[0023] It should also be noted that the electronic control unit of the engine 5 is the ECU of the engine 5.

[0024] The engine 5 is also electrically connected to a combustion analyzer for judging its misfire condition. Specifically, the misfire condition of the engine 5 can be judged by the combustion analyzer.

[0025] The spare pin in the electronic control unit of the engine 5 is connected to the nozzle 4.

[0026] The nozzle 4 is specifically a urea nozzle. The control device has low development and production costs and strong practicality.

[0027] A trachea A6 is butt-jointed and fixed between the exhaust end of the compressor 1 and the intake end of the water storage tank 2. The gas discharged by the compressor 1 can be led into the water storage tank 2 through the trachea A6 to apply water pressure so that water can be ejected when the nozzle 4 is opened.

[0028] A water pipe 7 is butt-jointed and fixed between the drainage end of the water storage tank 2 and the water inlet of the nozzle 4, and the water flowmeter 3 is installed on the water pipe 7. The design of the water pipe 7 enables the water in the water storage tank 2 to be ejected through the nozzle 4, and the ejected flow rate can be recorded by the water flowmeter 3, improving the accuracy of the test data.

[0029] A trachea B8 is butt-jointed and fixed between the intake port of the engine 5 and the airway inlet of the nozzle 4. The nozzle 4 is connected to the engine 5 through the trachea B8, which is convenient for efficiently carrying out the high humidity test on the engine 5.

[0030] When this application is used:

[0031] The compressed air discharged from the compressor 1 enters the water storage tank 2 through the air pipe A6 to endow water pressure so that water can be ejected when the nozzle 4 is opened; the spare pin in the electronic control unit of the engine 5 is connected to the nozzle 4, and a temporary variable is newly added in the software to control the opening and closing of the nozzle 4. During the test, the nozzle 4 is controlled to be opened through the electronic control unit of the engine 5 until the first misfire of the engine 5 (judged by the combustion analyzer), then the nozzle 4 is closed, and at the same time, the relevant data of the engine 5 and the reading of the water flowmeter 3 are recorded. The above test is repeated 3 times under the same working conditions and the average value is taken to achieve the accuracy of the high humidity test data of the engine 5.

[0032] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present application, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A natural gas engine high humidity test intake control system, characterized in that: The invention comprises a compressor (1) and a water storage tank (2) connected to the exhaust end thereof, wherein the water outlet end of the water storage tank (2) is connected to a water flow meter (3) and a nozzle (4) in sequence, the air inlet end of the nozzle (4) is connected to an engine (5), and the electronic control unit of the engine (5) is also electrically connected to the nozzle (4) and the water flow meter (3).

2. The natural gas engine high humidity test intake control system according to claim 1, characterized in that: The engine (5) is also electrically connected to a combustion analyzer for determining its misfire condition.

3. The natural gas engine high humidity test intake control system according to claim 1, characterized in that: A spare pin in the electronic control unit of the engine (5) is connected to the nozzle (4).

4. The natural gas engine high humidity test intake control system according to claim 1, characterized in that: The nozzle (4) is specifically a urea nozzle.

5. The natural gas engine high humidity test intake control system according to claim 1, characterized in that: An air pipe A (6) is butt-jointed and fixed between the exhaust end of the compressor (1) and the intake end of the water storage tank (2).

6. The natural gas engine high humidity test intake control system according to claim 1, characterized in that: A water pipe (7) is butt-jointed and fixed between the water discharge end of the water storage tank (2) and the water inlet of the nozzle (4), and the water flow meter (3) is mounted on the water pipe (7).

7. The natural gas engine high humidity test intake control system according to claim 1, characterized in that: An air pipe B (8) is fixedly connected between the air inlet of the engine (5) and the airway inlet of the nozzle (4).

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