CN111022220B - Method, device, system and equipment for detecting leakage of gaseous natural gas - Google Patents

Method, device, system and equipment for detecting leakage of gaseous natural gas Download PDF

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CN111022220B
CN111022220B CN201911381298.4A CN201911381298A CN111022220B CN 111022220 B CN111022220 B CN 111022220B CN 201911381298 A CN201911381298 A CN 201911381298A CN 111022220 B CN111022220 B CN 111022220B
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natural gas
current
gaseous natural
temperature
gas
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CN111022220A (en
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于洪峰
秦春红
王文霞
曹红艳
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0293—Safety devices; Fail-safe measures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The application provides a method, a device, a system and equipment for detecting leakage of gaseous natural gas, wherein the method comprises the steps of obtaining the actual gaseous natural gas temperature of a gas rail assembly and calculating the temperature of ideal gaseous natural gas of the gas rail assembly; then, judging whether the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is larger than a preset temperature difference or not; and finally, if the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is larger than a preset temperature difference, confirming that the gaseous natural gas leaks. The purpose of detecting whether the gas natural gas supply system in the engine leaks or not in real time is achieved.

Description

Method, device, system and equipment for detecting leakage of gaseous natural gas
Technical Field
The application relates to the technical field of natural gas engines, in particular to a method, a device, a system and equipment for detecting leakage of gaseous natural gas.
Background
With the continuous improvement of the living standard of China, the environmental protection consciousness of people is gradually enhanced. Therefore, the development of natural gas to replace petroleum fuel is significant, and the use of natural gas to replace petroleum fuel is an effective measure for optimizing an energy structure and reducing tail gas pollution. Compared with the traditional petroleum fuel, the natural gas has the characteristics of high combustible component, wide ignition range, strong anti-knock capability, good economy and the like, and can better meet the requirements of automobile operation and relevant emission regulations.
However, the most important gaseous natural gas supply systems in natural gas engines are often at risk of gas leakage. However, in the actual application process, it is very difficult to detect the supply system of the gaseous natural gas in the natural gas engine and determine whether the gas leakage occurs.
Therefore, a method for detecting whether a gas natural gas supply system in a natural gas engine leaks in real time is needed.
Disclosure of Invention
In view of the above, the present application provides a method, an apparatus, a system and a device for detecting leakage of gaseous natural gas, which are used for detecting whether leakage occurs in a supply system of gaseous natural gas in a natural gas engine in real time.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides a detection method for gas state natural gas leakage in a first aspect, which comprises the following steps:
acquiring the actual temperature of the gaseous natural gas of the gas rail assembly, and calculating to obtain the ideal temperature of the gaseous natural gas of the gas rail assembly;
judging whether the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference or not;
and if the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than the preset temperature difference, confirming that the gaseous natural gas leaks.
Optionally, the calculating to obtain the ideal temperature of the gaseous natural gas of the gas rail assembly includes:
acquiring the current rotating speed of the engine, and calculating to obtain the current flow of the gaseous natural gas;
obtaining the current flow of the cooling water at the inlet corresponding to the current rotating speed of the engine according to the preset corresponding relation between the rotating speed of the engine and the flow of the cooling water at the inlet;
inputting the current flow of the cooling water at the inlet, the current flow of the gaseous natural gas, the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the air rail inlet into a preset physical model, and calculating to obtain the ideal temperature of the gaseous natural gas of the air rail assembly; and the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the gas rail inlet are respectively obtained through the corresponding temperature sensors.
Optionally, the calculating to obtain the current flow rate of the gaseous natural gas includes:
acquiring the current driving power-on time of the air injection valve and the current pressure of the air rail; the current pressure of the air rail is the current pressure of the air rail obtained through the pressure sensor or preset air rail pressure;
obtaining the current gas injection amount of the single-cylinder cycle corresponding to the current driving power-up time of the gas spraying valve and the current pressure of the gas rail according to the corresponding relation between the preset driving power-up time of the gas spraying valve and the gas rail pressure and the single-cylinder cycle gas injection amount;
calculating the current gas injection amount of the single-cylinder cycle, the number of cylinders of the engine and the current rotating speed of the engine according to a preset calculation formula to obtain the current flow of the gaseous natural gas; wherein: the preset calculation formula is as follows:
the flow of the gaseous natural gas is equal to the jet quantity of a single-cylinder cycle multiplied by the number of cylinders multiplied by the engine speed/120.
Optionally, before the acquiring the actual temperature of the gaseous natural gas on the gas rail assembly and calculating the ideal temperature of the gaseous natural gas on the gas rail assembly, the method further includes:
acquiring the current rotating speed of the engine;
judging whether the current rotating speed of the engine is greater than the preset rotating speed or not;
and if the current rotating speed of the engine is judged to be greater than the preset rotating speed, acquiring the actual gaseous natural gas temperature on the gas rail assembly, and calculating to obtain the temperature of the ideal gaseous natural gas on the gas rail assembly.
The present application provides in a second aspect a gaseous natural gas leak detection apparatus comprising:
the first acquisition unit is used for acquiring the actual temperature of the gaseous natural gas of the gas rail assembly and calculating to obtain the ideal temperature of the gaseous natural gas of the gas rail assembly;
the first judgment unit is used for judging whether the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference or not;
and the confirming unit is used for confirming that the gaseous natural gas leaks if the difference value between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference value, which is judged by the first judging unit.
Optionally, the first obtaining unit includes:
the second acquisition unit is used for acquiring the current rotating speed of the engine and calculating to obtain the current flow of the gaseous natural gas;
the first determining unit is used for obtaining the current flow of the cooling water at the inlet corresponding to the current rotating speed of the engine according to the preset corresponding relation between the rotating speed of the engine and the flow of the cooling water at the inlet;
the first calculation unit is used for inputting the current flow of the cooling water at the inlet, the current flow of the gaseous natural gas, the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the air rail inlet into a preset physical model, and calculating to obtain the ideal temperature of the gaseous natural gas of the air rail assembly; and the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the gas rail inlet are respectively obtained through the corresponding temperature sensors.
Optionally, the second obtaining unit includes:
the third acquisition unit is used for acquiring the current driving power-on time of the air injection valve and the current pressure of the air rail; the current pressure of the air rail is the current pressure of the air rail obtained through the pressure sensor or preset air rail pressure;
the second determination unit is used for obtaining the current air injection quantity of the single-cylinder circulation corresponding to the current driving power-up time of the air jet valve and the current pressure of the air rail according to the corresponding relation between the preset driving power-up time of the air jet valve and the air rail pressure and the single-cylinder circulation air injection quantity;
the second calculation unit is used for calculating the current air injection amount of the single-cylinder cycle, the number of cylinders of the engine and the current rotating speed of the engine according to a preset calculation formula to obtain the current flow of the gaseous natural gas; wherein: the preset calculation formula is as follows:
the flow of the gaseous natural gas is equal to the jet quantity of a single-cylinder cycle multiplied by the number of cylinders multiplied by the engine speed/120.
Optionally, the apparatus for detecting a leakage of gaseous natural gas further includes:
the fourth acquisition unit is used for acquiring the current rotating speed of the engine;
the second judgment unit is used for judging whether the current rotating speed of the engine is greater than the preset rotating speed or not;
and the execution unit is used for executing the acquisition of the actual gaseous natural gas temperature on the gas rail assembly and calculating to obtain the temperature of the ideal gaseous natural gas on the gas rail assembly if the second judgment unit judges that the current rotating speed of the engine is greater than the preset rotating speed.
A third aspect of the present application provides a system for detecting a gaseous natural gas leak, comprising:
an electronic control unit for carrying out the method of detecting a gaseous natural gas leak according to any one of the first aspect of the present application;
the gas rail assembly is provided with a sensor of gas natural gas pressure and a temperature sensor; the temperature sensor is used for acquiring the actual temperature of the gaseous natural gas of the gas rail assembly and the current temperature of the gaseous natural gas at the gas rail inlet; the pressure sensor of the gaseous natural gas is used for acquiring the current pressure of the gas rail;
the environment temperature sensor is used for acquiring the current environment temperature;
and the cooling water temperature sensor is used for acquiring the current temperature of the cooling water at the inlet.
A fourth aspect of the present application provides an apparatus comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement a method of detecting a gaseous natural gas leak as defined in any one of the first aspects of the present application.
According to the scheme, in the detection method, the device, the system and the equipment for the leakage of the gaseous natural gas, the actual gaseous natural gas temperature of the gas rail assembly is obtained, and the temperature of the ideal gaseous natural gas of the gas rail assembly is calculated; then, judging whether the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is larger than a preset temperature difference or not; and finally, if the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is larger than a preset temperature difference, confirming that the gaseous natural gas leaks. The purpose of detecting whether the leakage occurs in the supply system of the gaseous natural gas in the natural gas engine in real time is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for detecting a gaseous natural gas leak according to an embodiment of the present disclosure;
FIG. 2 is a flow chart illustrating a method for detecting a gaseous natural gas leak according to another embodiment of the present disclosure;
FIG. 3 is a flow chart illustrating a method for detecting a gaseous natural gas leak according to another embodiment of the present disclosure;
FIG. 4 is a flow chart illustrating a method for detecting a gaseous natural gas leak according to another embodiment of the present disclosure;
FIG. 5 is a schematic view of a gaseous natural gas leak detection apparatus according to another embodiment of the present disclosure;
fig. 6 is a schematic diagram of a first obtaining unit according to another embodiment of the present application;
fig. 7 is a schematic diagram of a second obtaining unit according to another embodiment of the present application;
FIG. 8 is a schematic view of a gaseous natural gas leak detection apparatus according to another embodiment of the present disclosure;
fig. 9 is a schematic diagram of an apparatus for performing gaseous natural gas leak detection according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first", "second", and the like, referred to in this application, are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of functions performed by these devices, modules or units, but the terms "include", or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements that are not explicitly listed, or includes elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a method for detecting leakage of gaseous natural gas, as shown in fig. 1, the method comprises the following steps:
s101, acquiring the actual temperature of the gaseous natural gas of the gas rail assembly, and calculating to obtain the ideal temperature of the gaseous natural gas of the gas rail assembly.
The actual temperature of the gaseous natural gas of the gas rail assembly can be obtained in real time through a temperature sensor carried by the gas rail assembly, and the ideal temperature of the gaseous natural gas of the gas rail assembly is the temperature which the gaseous natural gas of the gas rail assembly should reach when the current gaseous natural gas is not leaked.
It should be noted that, regardless of the actual temperature of the gaseous natural gas on the gas rail assembly or the desired temperature of the gaseous natural gas on the gas rail assembly, the actual temperature or the desired temperature of the gaseous natural gas on the gas rail assembly changes according to the change of the operation state of the gaseous natural gas supply system in the engine.
Optionally, in another embodiment of the present application, an implementation manner before step S101 further includes:
s201, obtaining the current rotating speed of the engine.
Specifically, the current rotating speed of the engine can be directly obtained through the electronic control unit, and the current rotating speed can also be obtained through an engine rotating speed sensor which is positioned on a flywheel shell and rotates in unit rpm, namely, rpm.
S202, judging whether the current rotating speed of the engine is larger than a preset rotating speed.
The preset rotating speed is a preset rotating speed obtained through a plurality of tests and researches of technicians, and can be selected according to actual conditions, which is not limited here.
Specifically, if the current rotation speed of the engine is determined to be greater than the preset rotation speed, step S203 is executed.
And S203, acquiring the actual gaseous natural gas temperature on the gas rail assembly, and calculating to obtain the temperature of the ideal gaseous natural gas on the gas rail assembly.
Specifically, the specific implementation process of obtaining the actual gaseous natural gas temperature on the gas rail assembly and calculating the ideal gaseous natural gas temperature on the gas rail assembly may refer to the embodiment corresponding to step S101, and details are not described here.
Alternatively, in another embodiment of the present application, one embodiment of calculating the ideal temperature of the gaseous natural gas of the gas rail assembly in step S101, as shown in fig. 3, includes the following steps:
s301, obtaining the current rotating speed of the engine, and calculating to obtain the current flow of the gaseous natural gas.
Specifically, the current rotating speed of the engine is directly obtained through the electronic control unit, and the current flow of the gaseous natural gas is calculated through the information acquired in real time.
Alternatively, in another embodiment of the present application, one implementation of the current flow rate of the gaseous natural gas calculated in step S301, as shown in fig. 4, includes the following steps:
s401, acquiring the current driving power-up time of the gas injection valve and the current pressure of the gas rail.
The current pressure of the air rail is the current pressure of the air rail obtained through the pressure sensor or preset air rail pressure; the current driving power-on time of the gas injection valve can be directly obtained by the electronic control unit.
S402, obtaining the current air injection amount of the single-cylinder cycle corresponding to the current driving power-up time of the air jet valve and the current pressure of the air rail according to the preset corresponding relation between the driving power-up time of the air jet valve and the air rail pressure and the single-cylinder cycle air injection amount.
The preset driving power-up time and the gas rail pressure of the jet valve correspond to the single-cylinder circulating gas injection amount, as shown in table 1, it can be seen that table 1 is a two-dimensional MAP, the horizontal axis in table 1 is the driving power-up time of the jet valve, the unit us is the gas rail pressure, and the unit bar is the vertical axis in table 1, and the corresponding current gas injection amount of the single-cylinder circulation can be obtained by inquiring in table 1 through the driving power-up time and the gas rail pressure of the jet valve. For example, if the current driving power-up time is 500us and the current pressure of the gas rail is 8bar, the current gas injection amount of the single-cylinder cycle is 0.06 kg/cyc.
It should be noted that table 1 only explains the correspondence between the preset driving power-up time of the gas injection valve and the gas rail pressure and the single-cylinder circulation gas injection amount, and in the actual application process, there are more values, and the specific values may be different, and the two-dimensional MAP can be updated in real time according to the actual situation.
Figure BDA0002342317900000081
TABLE 1
And S403, calculating the current gas injection amount of the single-cylinder cycle, the number of cylinders of the engine and the current rotating speed of the engine according to a preset calculation formula to obtain the current flow of the gaseous natural gas.
Wherein: the preset calculation formula is as follows:
the flow of the gaseous natural gas is equal to the jet quantity of a single-cylinder cycle multiplied by the number of cylinders multiplied by the engine speed/120.
The number of cylinders of the engine is the attribute of the body of the engine, and the number of cylinders of each engine may be different, such as a 4-cylinder engine, a 6-cylinder engine, and the like; the rotating speed of the engine can directly obtain the current rotating speed of the engine through the electronic control unit, and can also pass through an engine rotating speed sensor which is positioned on the flywheel shell and rotates at unit rpm, namely revolution/minute; the air injection quantity of the single-cylinder circulation can be obtained by inquiring the corresponding relation between the preset driving power-up time of the air injection valve and the air rail pressure and the air injection quantity of the single-cylinder circulation.
Specifically, the obtained current gas injection amount of the single-cylinder cycle, the number of cylinders of the engine and the current rotating speed of the engine are input into a preset calculation formula, and the current flow rate of the gaseous natural gas, namely the size of the gaseous natural gas injected per second, is calculated and obtained, wherein the unit is kg/s.
S302, obtaining the current flow of the cooling water at the inlet corresponding to the current rotating speed of the engine according to the preset corresponding relation between the rotating speed of the engine and the flow of the cooling water at the inlet.
The preset corresponding relationship between the rotation speed of the engine and the flow rate of the cooling water at the inlet can be shown in table 2, and the rotation speed in table 2 represents the rotation speed of the engine, and the unit is rpm, i.e. revolutions per minute. The flow rate is the flow rate of cooling water at the inlet and is expressed in kg/s. It can be seen that the engine speed corresponds to the coolant flow at the inlet.
It should be noted that table 2 only explains the correspondence between the preset engine speed and the flow rate of the cooling water at the inlet, and in the actual application process, there are more values, and the specific values may be different, and may be updated in real time according to the actual situation.
Rotational speed 0 100 500 1000 1500 2000 2500 3000 4000
Flow rate 1 2 3 4 5 6 7 8 9
TABLE 2
And S303, inputting the current flow of the cooling water at the inlet, the current flow of the gaseous natural gas, the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the inlet of the gas rail into a preset physical model, and calculating to obtain the ideal temperature of the gaseous natural gas of the gas rail assembly.
The current environment temperature can be directly acquired through an environment temperature sensor, the unit of the current temperature of K and cooling water at an inlet can be directly acquired through a cooling water temperature sensor, and the unit of the current temperature of K and the gaseous natural gas at the inlet of the gas rail can be directly acquired through a temperature sensor at the inlet of the gas rail.
The preset physical model comprises the following calculation formula:
Figure BDA0002342317900000091
wherein epsilon is the efficiency of the heat exchanger, the ratio of the actual heat exchange effect of the heat exchanger to the maximum possible heat exchange effect is marked, NTU represents a heat transfer unit, and the heat transfer unit is a parameter reflecting the difficulty of the heat exchange process between cold fluid and hot fluid and is also a parameter for measuring the heat transfer capacity of the heat exchanger. C is the specific heat capacity, and the units J/(kg. k), qmIs the flow of gaseous natural gas.
Figure BDA0002342317900000092
Wherein A is heat exchange area, and the unit is m2And K is the heat transfer coefficient in W/K.
Φ＝qmcΔt；
Where Φ is the heat transfer amount and Δ t is the temperature at which the heat transfer unit changes.
Figure BDA0002342317900000093
According to the heat transfer formula;
Figure BDA0002342317900000101
according to the heat transfer formula;
Figure BDA0002342317900000102
CNG represents, among others, gaseous natural gas.
(qmc)min＝qWater (W)cWater (W)；
(qmc)max＝qCNGcCNG。
Specifically, the current flow rate of the cooling water at the inlet, the current flow rate of the gaseous natural gas, the current ambient temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the air rail inlet are input into a preset physical model, so that the ideal temperature of the gaseous natural gas of the air rail assembly can be automatically calculated.
S102, judging whether the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference or not.
The preset temperature difference value is a difference value obtained through a plurality of tests and researches by technicians, different preset temperature difference values exist for different engines, different air rail assemblies and different combinations of the air rail assemblies and the different engines, and can be selected according to actual conditions without limitation.
Specifically, since the difference between the ideal temperature of the gaseous natural gas and the actual temperature of the gaseous natural gas in the gas rail assembly may be a positive number or a negative number, the absolute value of the difference between the ideal temperature of the gaseous natural gas and the actual temperature of the gaseous natural gas in the gas rail assembly is determined, and then, whether the absolute value of the difference between the ideal temperature of the gaseous natural gas in the gas rail assembly and the actual temperature of the gaseous natural gas in the gas rail assembly is greater than a preset temperature difference (e.g., 5 ℃) or not is determined, if the difference between the ideal temperature of the gaseous natural gas in the gas rail assembly and the actual temperature of the gaseous natural gas in the gas rail assembly is greater than the preset temperature difference, step S103 is executed.
Similarly, the preset temperature difference may also be an interval, such as-5 ℃ to +5 ℃, and if it is determined that the difference between the ideal temperature of the gaseous natural gas in the gas rail assembly and the actual temperature of the gaseous natural gas in the gas rail assembly is not within the interval of the preset temperature difference, step S103 is executed.
S103, confirming the leakage of the gas natural gas.
According to the scheme, in the detection method for the leakage of the gaseous natural gas, the actual gaseous natural gas temperature of the gas rail assembly is obtained, and the temperature of the ideal gaseous natural gas of the gas rail assembly is calculated; then, judging whether the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is larger than a preset temperature difference or not; and finally, if the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is larger than a preset temperature difference, confirming that the gaseous natural gas leaks. The purpose of detecting whether the leakage occurs in the supply system of the gaseous natural gas in the natural gas engine in real time is achieved.
The embodiment of the present application provides a detection apparatus for gaseous natural gas leakage, as shown in fig. 5, including:
the first obtaining unit 501 is configured to obtain an actual temperature of the gaseous natural gas of the gas rail assembly, and calculate an ideal temperature of the gaseous natural gas of the gas rail assembly.
Optionally, in another embodiment of the present application, an implementation manner of the first obtaining unit 501, as shown in fig. 6, includes:
and a second obtaining unit 601, configured to obtain a current rotation speed of the engine, and calculate a current flow rate of the gaseous natural gas.
Optionally, in another embodiment of the present application, an implementation manner of the second obtaining unit 601, as shown in fig. 7, includes:
and a third obtaining unit 701, configured to obtain a current driving power-on time of the gas injection valve and a current pressure of the gas rail.
The current pressure of the air rail is the current pressure of the air rail obtained through the pressure sensor or preset air rail pressure.
The second determining unit 702 is configured to obtain the current air injection amount of the single-cylinder cycle corresponding to the current driving and energizing time of the air injector and the current pressure of the air rail according to the preset corresponding relationship between the driving and energizing time of the air injector and the air rail pressure and the air injection amount of the single-cylinder cycle.
The second calculating unit 703 is configured to calculate the current air injection amount of the single-cylinder cycle, the number of cylinders of the engine, and the current rotation speed of the engine according to a preset calculation formula, so as to obtain the current flow rate of the gaseous natural gas.
Wherein: the preset calculation formula is as follows:
the flow of the gaseous natural gas is equal to the jet quantity of a single-cylinder cycle multiplied by the number of cylinders multiplied by the engine speed/120.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 4, which is not described herein again.
The first determining unit 602 is configured to obtain a current flow rate of the cooling water at the inlet corresponding to a current rotation speed of the engine according to a preset correspondence between the rotation speed of the engine and a flow rate of the cooling water at the inlet.
The first calculating unit 603 is configured to input the current flow rate of the cooling water at the inlet, the current flow rate of the gaseous natural gas, the current ambient temperature, the current temperature of the cooling water at the inlet, and the current temperature of the gaseous natural gas at the air rail inlet into a preset physical model, and calculate an ideal temperature of the gaseous natural gas of the air rail assembly.
The current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the inlet of the air rail are respectively obtained through the temperature sensors corresponding to the temperature sensors.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 3, which is not described herein again.
The first determining unit 502 is configured to determine whether a difference between an ideal temperature of the gaseous natural gas of the gas rail assembly and an actual temperature of the gaseous natural gas of the gas rail assembly is greater than a preset temperature difference.
A confirming unit 503, configured to confirm that the gaseous natural gas leaks if the first determining unit 502 determines that the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is greater than the preset temperature difference.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 1, which is not described herein again.
Alternatively, in another embodiment of the present application, an implementation of the apparatus for detecting a leakage of natural gas in a gaseous state, as shown in fig. 8, further includes:
a fourth obtaining unit 801, configured to obtain a current rotation speed of the engine.
A second judging unit 802, configured to judge whether the current rotation speed of the engine is greater than the preset rotation speed.
And an executing unit 803, configured to execute, if the second determining unit 802 determines that the current rotation speed of the engine is greater than the preset rotation speed, acquiring an actual gaseous natural gas temperature on the gas rail assembly, and calculating to obtain a temperature of an ideal gaseous natural gas on the gas rail assembly.
For a specific working process of the unit disclosed in the above embodiment of the present application, reference may be made to the content of the corresponding method embodiment, as shown in fig. 2, which is not described herein again.
According to the scheme, in the detection device for the leakage of the gaseous natural gas, the actual gaseous natural gas temperature of the gas rail assembly is obtained through the first obtaining unit 501, and the temperature of the ideal gaseous natural gas of the gas rail assembly is calculated; then, the first judging unit 502 is utilized to judge whether the difference between the temperature of the ideal gaseous natural gas of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is greater than a preset temperature difference value; finally, if the first determining unit 502 determines that the difference between the ideal gaseous natural gas temperature of the gas rail assembly and the actual gaseous natural gas temperature of the gas rail assembly is greater than the preset temperature difference, the determining unit 503 is used to determine that the gaseous natural gas leaks. The purpose of detecting whether the leakage occurs in the supply system of the gaseous natural gas in the natural gas engine in real time is achieved.
Another embodiment of the present application provides a system for detecting a leakage of gaseous natural gas, including:
an electronic control unit for carrying out the method of gaseous natural gas leakage as described in any one of the above embodiments.
The gas rail assembly is provided with a sensor of gas natural gas pressure and a temperature sensor; the temperature sensor is used for acquiring the actual temperature of the gaseous natural gas of the gas rail assembly and the current temperature of the gaseous natural gas at the gas rail inlet; the pressure sensor of the gaseous natural gas is used for acquiring the current pressure of the gas rail.
And the environment temperature sensor is used for acquiring the current environment temperature.
And the cooling water temperature sensor is used for acquiring the current temperature of the cooling water at the inlet.
Another embodiment of the present application provides an apparatus, as shown in fig. 9, including:
one or more processors 901.
Storage 902 having one or more programs stored thereon.
The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of gaseous natural gas leak as described in any of the above embodiments.
In the above embodiments disclosed in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present disclosure may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a live broadcast device, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Those skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A method for detecting leakage of gaseous natural gas, comprising:
acquiring the actual temperature of the gaseous natural gas of the gas rail assembly, the current rotating speed of the engine and calculating to obtain the current flow of the gaseous natural gas;
obtaining the current flow of the cooling water at the inlet corresponding to the current rotating speed of the engine according to the preset corresponding relation between the rotating speed of the engine and the flow of the cooling water at the inlet;
inputting the current flow of the cooling water at the inlet, the current flow of the gaseous natural gas, the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the air rail inlet into a preset physical model, and calculating to obtain the ideal temperature of the gaseous natural gas of the air rail assembly; the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the gas rail inlet are respectively obtained through the corresponding temperature sensors; judging whether the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference or not;
and if the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than the preset temperature difference, confirming that the gaseous natural gas leaks.
2. The detection method according to claim 1, wherein the calculating a current flow rate of the gaseous natural gas comprises:
acquiring the current driving power-on time of the air injection valve and the current pressure of the air rail; the current pressure of the air rail is the current pressure of the air rail obtained through the pressure sensor or preset air rail pressure;
obtaining the current gas injection amount of the single-cylinder cycle corresponding to the current driving power-up time of the gas spraying valve and the current pressure of the gas rail according to the corresponding relation between the preset driving power-up time of the gas spraying valve and the gas rail pressure and the single-cylinder cycle gas injection amount;
calculating the current gas injection amount of the single-cylinder cycle, the number of cylinders of the engine and the current rotating speed of the engine according to a preset calculation formula to obtain the current flow of the gaseous natural gas; wherein: the preset calculation formula is as follows:
flow of gaseous natural gas = jet quantity per single cylinder cycle x number of cylinders x engine speed/120.
3. The method of detecting according to claim 1, wherein before the obtaining an actual temperature of the gaseous natural gas on the gas rail assembly and calculating a desired temperature of the gaseous natural gas on the gas rail assembly, further comprising:
acquiring the current rotating speed of the engine;
judging whether the current rotating speed of the engine is greater than the preset rotating speed of the engine or not;
and if the current rotating speed of the engine is judged to be greater than the preset rotating speed of the engine, acquiring the actual gaseous natural gas temperature on the gas rail assembly, and calculating to obtain the temperature of the ideal gaseous natural gas on the gas rail assembly.
4. A gaseous natural gas leak detection apparatus, comprising:
the first acquisition unit is used for acquiring the actual temperature of the gaseous natural gas of the gas rail assembly;
the second acquisition unit is used for acquiring the current rotating speed of the engine and calculating to obtain the current flow of the gaseous natural gas;
the first determining unit is used for obtaining the current flow of the cooling water at the inlet corresponding to the current rotating speed of the engine according to the preset corresponding relation between the rotating speed of the engine and the flow of the cooling water at the inlet;
the first calculation unit is used for inputting the current flow of the cooling water at the inlet, the current flow of the gaseous natural gas, the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the air rail inlet into a preset physical model, and calculating to obtain the ideal temperature of the gaseous natural gas of the air rail assembly; the current environment temperature, the current temperature of the cooling water at the inlet and the current temperature of the gaseous natural gas at the gas rail inlet are respectively obtained through the corresponding temperature sensors;
the first judgment unit is used for judging whether the difference between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference or not;
and the confirming unit is used for confirming that the gaseous natural gas leaks if the difference value between the ideal temperature of the gaseous natural gas of the gas rail assembly and the actual temperature of the gaseous natural gas of the gas rail assembly is larger than a preset temperature difference value, which is judged by the first judging unit.
5. The detection apparatus according to claim 4, wherein the second acquisition unit includes:
the third acquisition unit is used for acquiring the current driving power-on time of the air injection valve and the current pressure of the air rail; the current pressure of the air rail is the current pressure of the air rail obtained through the pressure sensor or preset air rail pressure;
the second determination unit is used for obtaining the current air injection quantity of the single-cylinder circulation corresponding to the current driving power-up time of the air jet valve and the current pressure of the air rail according to the corresponding relation between the preset driving power-up time of the air jet valve and the air rail pressure and the single-cylinder circulation air injection quantity;
the second calculation unit is used for calculating the current air injection amount of the single-cylinder cycle, the number of cylinders of the engine and the current rotating speed of the engine according to a preset calculation formula to obtain the current flow of the gaseous natural gas; wherein: the preset calculation formula is as follows:
flow of gaseous natural gas = jet quantity per single cylinder cycle x number of cylinders x engine speed/120.
6. The detection device of claim 4, further comprising:
the fourth acquisition unit is used for acquiring the current rotating speed of the engine;
the second judgment unit is used for judging whether the current rotating speed of the engine is greater than the preset rotating speed of the engine or not;
and the execution unit is used for executing the acquisition of the actual gaseous natural gas temperature on the gas rail assembly and calculating to obtain the temperature of the ideal gaseous natural gas on the gas rail assembly if the second judgment unit judges that the current rotating speed of the engine is greater than the preset rotating speed of the engine.
7. A system for detecting a gaseous natural gas leak, comprising:
an electronic control unit for performing the method of detecting a gaseous natural gas leak according to any one of claims 1 to 3;
the gas rail assembly is provided with a pressure sensor for detecting the pressure of the gaseous natural gas and a temperature sensor for detecting the temperature of the gaseous natural gas; the temperature sensor is used for acquiring the actual temperature of the gaseous natural gas of the gas rail assembly and the current temperature of the gaseous natural gas at the gas rail inlet; the pressure sensor of the gaseous natural gas is used for acquiring the current pressure of the gas rail;
the environment temperature sensor is used for acquiring the current environment temperature;
and the cooling water temperature sensor is used for acquiring the current temperature of the cooling water at the inlet.
8. An apparatus for detecting a gaseous natural gas leak, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of detecting a gaseous natural gas leak of any one of claims 1 to 3.
CN201911381298.4A 2019-12-27 2019-12-27 Method, device, system and equipment for detecting leakage of gaseous natural gas Active CN111022220B (en)

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