CN114183244A - Method, device and system for monitoring state of gas buffer tank and storage medium - Google Patents

Method, device and system for monitoring state of gas buffer tank and storage medium Download PDF

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Publication number
CN114183244A
CN114183244A CN202111444274.6A CN202111444274A CN114183244A CN 114183244 A CN114183244 A CN 114183244A CN 202111444274 A CN202111444274 A CN 202111444274A CN 114183244 A CN114183244 A CN 114183244A
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China
Prior art keywords
buffer tank
gas
state
gas buffer
pressure
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CN202111444274.6A
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CN114183244B (en
Inventor
卫阳飞
徐帅卿
李旭
苏东超
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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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating or supervising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • F02B2043/103—Natural gas, e.g. methane or LNG used as a fuel
    • 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

Abstract

The invention discloses a method, a device and a system for monitoring the state of a gas buffer tank and a storage medium. The method for monitoring the state of the gas buffer tank comprises the following steps: judging the opening and closing state of the pressure release valve; when the pressure release valve is changed from a closed state to an open state, acquiring first gas mass of the gas buffer tank, and when the pressure release valve is changed from the open state to the closed state, acquiring second gas mass of the gas buffer tank; calculating the third gas mass of the gas buffer tank when the pressure relief valve is in an opening state between two adjacent closing states; calculating the difference value between the first fuel gas quality and the second fuel gas quality, and updating the correction coefficient through the difference value and the third fuel gas quality; and determining whether the gas buffer tank is in fault or not through the updated correction coefficient.

Description

Method, device and system for monitoring state of gas buffer tank and storage medium
Technical Field
The embodiment of the invention relates to the technology of HPDI engines, in particular to a method, a device and a system for monitoring the state of a fuel gas buffer tank and a storage medium.
Background
The HPDI engine is a natural gas engine with high-pressure direct injection compression ignition in a cylinder, when the HPDI engine runs, 5% of diesel oil is injected into the cylinder for ignition before the compression top dead center, 95% of natural gas is injected into a flame at the pressure of 300bar to be used as main fuel for combustion and work, the HPDI engine can reduce the emission of particulate matters by 70%, and the CO2 by about 20%.
When the HPDI engine runs, diesel oil and natural gas are directly injected in the cylinder through the high-pressure common rail, stable fuel gas supply is provided for the high-pressure common rail through the buffer tank in the HPDI engine system, during normal work, the buffer tank is pumped by the LNG pump, and the LNG pump stops pumping after the gas in the buffer tank reaches a certain pressure. The LNG pump during operation can lead to diesel oil, machine oil, water etc. to get into the buffer tank owing to misuse or control unstability to lead to the buffer tank volume to diminish, and then lead to the pump gas control of LNG pump to appear the deviation, the life of LNG pump shortens.
In the prior art, an effective monitoring means for volume change of the buffer tank is lacked, the buffer tank cannot be overhauled in time when the buffer tank breaks down, and the service life of an HPDI engine system is extremely easy to be influenced.
Disclosure of Invention
The invention provides a method, a device and a system for monitoring the state of a gas buffer tank and a storage medium, which aim to realize the purpose of monitoring the volume change of the buffer tank.
In a first aspect, an embodiment of the present invention provides a method for monitoring a state of a gas buffer tank, including: judging the opening and closing state of the pressure release valve;
when the pressure release valve is changed from a closed state to an open state, acquiring first gas mass of the gas buffer tank, and when the pressure release valve is changed from the open state to the closed state, acquiring second gas mass of the gas buffer tank;
calculating the third gas mass of the gas buffer tank when the pressure release valve is in an opening state between two adjacent closing states;
calculating a difference value between the first fuel gas quality and the second fuel gas quality, and updating a correction coefficient according to the difference value and the third fuel gas quality;
and determining whether the gas buffer tank is in fault or not through the updated correction coefficient.
Optionally, determining the first gas quality according to the first pressure and the first temperature of the gas buffer tank;
and determining the second fuel gas quality according to the second pressure and the second temperature of the fuel gas buffer tank.
Optionally, the first fuel gas quality and the second fuel gas quality are determined by a two-dimensional interpolation table.
Optionally, before updating the correction coefficient, determining an operating state of the engine;
and if the running state of the engine is not in the set range, not updating the correction coefficient.
Optionally, before updating the correction coefficient, determining whether the second pressure is smaller than the first pressure;
and if the second pressure is greater than the first pressure, not updating the correction coefficient.
Optionally, the method further includes recording a correction coefficient of the historical time, and updating the correction coefficient according to the correction coefficient of the historical time and the correction coefficient calculated at the current time.
Optionally, the correction method further includes recording a correction coefficient at a historical time, where the correction coefficient at the historical time is used to determine whether the calculated correction coefficient is abnormal.
In a second aspect, an embodiment of the present invention further provides a device for monitoring a state of a gas buffer tank, including a monitoring unit, where the monitoring unit is configured to:
judging the opening and closing state of the pressure release valve;
when the pressure release valve is changed from a closed state to an open state, acquiring first gas mass of the gas buffer tank, and when the pressure release valve is changed from the open state to the closed state, acquiring second gas mass of the gas buffer tank;
calculating the third gas mass of the gas buffer tank when the pressure release valve is in an opening state between two adjacent closing states;
calculating a difference value between the first fuel gas quality and the second fuel gas quality, and calculating the fuel gas variation through the difference value and a correction coefficient at the current moment;
and updating the correction coefficient according to the gas variation and the third gas quality, and determining whether the gas buffer tank is in fault according to the correction coefficient.
In a third aspect, an embodiment of the present invention further provides a system for monitoring a state of a gas buffer tank, including a controller, where the controller is configured with an executable program, and the executable program implements the method for monitoring a state of a gas buffer tank according to the embodiment of the present invention when running.
In a fourth aspect, the embodiment of the present invention further provides a storage medium, which stores an executable program, and when the executable program runs, the method for monitoring the state of the gas buffer tank according to the embodiment of the present invention is implemented.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for monitoring the state of the gas buffer tank determines a correction coefficient according to the acquired first gas quality, the acquired second gas quality and the calculated third gas quality, can judge whether liquid which should not appear exists in the buffer tank or not according to the correction coefficient, further determines whether the volume of the buffer tank changes or not, and can find the fault in time when the volume of the buffer tank changes so as to facilitate maintenance of an engine system.
2. The correction coefficient determined by the method for monitoring the state of the gas buffer tank can be directly used for improving the control process of the pump gas when the buffer tank breaks down, so that the problems that the LNG pump frequently has short stroke before maintenance and the service life of the LNG pump is shortened are solved.
Drawings
FIG. 1 is a flow chart of a method for monitoring the condition of a gas buffer tank in an embodiment;
FIG. 2 is a schematic illustration of an embodiment of an HPDI engine system air supply configuration;
FIG. 3 is a schematic diagram showing changes in surge tank pressure in the embodiment;
FIG. 4 is a flow chart of another method for monitoring the condition of a gas buffer tank in an embodiment;
FIG. 5 is a schematic view of a gas buffer tank state monitoring device in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for monitoring a state of a gas buffer tank in an embodiment, and referring to fig. 1, the method includes:
and S101, judging the opening and closing states of the pressure release valve.
In an exemplary embodiment, the method for monitoring the condition of the buffer tank of the fuel gas in the HPDI engine system is suitable for monitoring the condition of the buffer tank in each pumping cycle when the HPDI engine is working.
Fig. 2 is a schematic diagram of an embodiment of an air supply structure of an HPDI engine system, and referring to fig. 2, in the HPDI engine system, an exemplary air supply structure includes a controller 100, an LNG (liquefied natural gas) pump 200, a vaporizer 300, a buffer tank 400, and a pressure relief valve 500.
The LNG pump 200 is connected with the LNG storage tank, and the LNG pump 200 is used for pumping liquefied natural gas in the LNG storage tank into the vaporizer 300;
the vaporizer 300 is used for vaporizing the liquefied natural gas, and the vaporized natural gas enters the buffer tank 400;
the buffer tank 400 is connected with the fuel gas common rail and the nozzle, and the buffer tank 400 provides natural gas for the engine through the fuel gas common rail and the nozzle;
the pressure relief valve 500 is used for relieving pressure of the LNG pump 200, and in the process of pumping gas by the LNG pump 200, if the pressure in the buffer tank 400 exceeds the limit value, the pressure relief valve 500 is opened to relieve the hydraulic pressure of hydraulic oil in the LNG pump 200 so as to stop the gas pumping process;
the controller 100 detects the pressure of the buffer tank 400, and controls the relief valve 500 and the LNG pump 200 to operate according to a predetermined program.
For example, the LNG pump 200 pumps gas into the buffer tank 400 in a circulating manner, and in the present embodiment, the controller 100 is configured to control the LNG pump 200 to pump gas at a fixed period under a certain condition.
For example, in the present embodiment, the process of setting one pumping cycle includes:
at the starting time, the controller 100 controls the pressure relief valve 500 to be in an open state, no pressure exists in the LNG pump 200, and the piston in the LNG pump 200 is at an initial position;
when the pumping starts, the controller 100 controls the pressure release valve 500 to be closed, hydraulic oil of the controller 100 enters the LNG pump 200, and the hydraulic oil pushes the piston to move so that the liquefied natural gas is pumped into the vaporizer 300;
after the piston moves in place, the controller 100 controls the hydraulic oil to flow out of the LNG pump 200, and the hydraulic oil drives the piston to return to the initial position;
after the piston returns to the initial position, the controller 100 controls the relief valve 500 to open;
when the pressure in the surge tank 400 exceeds the limit during the pumping of the LNG pump 200, the controller 100 controls the relief valve 500 to open.
For example, based on the above, under the condition of a certain working condition and no abnormality in the system, the time length of the pressure relief valve 500 in the open state is fixed, the time length of the piston moving to the right position is fixed, and the time length of the piston returning to the initial position is fixed.
Fig. 3 is a schematic diagram of pressure change of the buffer tank in the embodiment, referring to fig. 3, when the pressure release valve is in an open state, under a normal condition, natural gas in the buffer tank is in a stable consumption state, pressure in the buffer tank steadily decreases, and when the pressure release valve is closed and the LNG pump pumps gas into the buffer tank, the pressure in the buffer tank gradually increases.
S102, obtaining first gas quality of the gas buffer tank when the pressure relief valve is changed from a closed state to an open state.
In this step, the first gas mass is the theoretical natural gas mass in the buffer tank when the pressure release valve is changed from the closed state to the open state.
For example, in this embodiment, the theoretical natural gas quality may be a calibration value of the gas quality in the buffer tank under a certain working condition.
S103, obtaining second gas quality of the gas buffer tank when the pressure release valve is changed from the opening state to the closing state.
In this step, the second gas mass is a theoretical gas mass in the buffer tank when the pressure release valve is changed from the open state to the closed state.
And S104, calculating the third gas mass of the gas buffer tank when the pressure relief valve is in an opening state between two adjacent closing states.
In this step, a measured value of mass flow of the natural gas in the buffer tank is obtained, integration is performed during a period in which the pressure release valve in one pumping cycle is in an open state, and a result obtained through calculation is the third gas mass.
Referring to fig. 3, in this step, the third fuel gas quality is the actual natural gas consumption in the buffer tank when the natural gas is in the steady consumption process theoretically.
And S105, calculating the difference value between the first fuel gas quality and the second fuel gas quality.
And S106, updating the correction coefficient through the difference and the third gas quality.
Illustratively, in this step, a ratio of the difference to the third fuel gas mass is calculated, and the ratio is used as a correction coefficient corresponding to the current pumping cycle.
And S107, determining whether the gas buffer tank is in fault or not through the updated correction coefficient.
For example, in this step, if the correction coefficient exceeds the set limit value, it is determined that the buffer tank is faulty.
For example, in the present embodiment, the failure of the buffer tank mainly refers to: the buffer tank is internally provided with high-boiling-point liquid (diesel oil, engine oil, water and the like entering the buffer tank due to improper use or unstable control), and the liquid can not be normally discharged, so that the volume of the buffer tank is reduced.
For example, when the gas consumption of the buffer tank is constant and high boiling point liquid exists in the buffer tank, if natural gas with the same quality is filled, the pressure in the buffer tank is correspondingly increased relative to the situation that the high boiling point liquid does not exist in the buffer tank;
in the pumping process, when the pressure in the buffer tank exceeds the limit value, the pressure release valve is controlled to open to release the pressure in the LNG pump so as to stop the pumping process, so that the problem that a piston in the LNG pump cannot move in place in one pumping cycle can occur, namely a short stroke occurs, and the service life of the LNG pump can be reduced due to frequent occurrence of the short stroke.
In this embodiment, the ratio of the theoretical gas consumption mass to the actual gas consumption mass in the unit time of the correction coefficient may also approximately represent the ratio of the pressure of the buffer tank to the actual pressure when the gas mass increase amount in the buffer tank in the unit time is the same, based on the approximately linear proportional relationship between the volume, the pressure, and the gas mass of the buffer tank.
Based on the above, in this embodiment, when the high boiling point liquid appears in the buffer tank, the control process of the LNG pump can be appropriately optimized by correcting the coefficient.
For example, under a certain working condition, when the buffer tank fails, the controller controls the LNG pump to pump gas according to a fixed period, the time interval between two adjacent gas pumping processes is set to be T, the mass of the pump gas in a single cycle is M, when the buffer tank fails, the controller can determine the time interval T1 again based on the correction coefficient, so that when the piston moves in place, the pressure in the buffer tank does not exceed the set limit value, and the problem of short stroke is avoided frequently.
According to the method for monitoring the state of the gas buffer tank, the correction coefficient is determined according to the acquired first gas quality, the acquired second gas quality and the calculated third gas quality, whether liquid which should not appear exists in the buffer tank can be judged through the correction coefficient, whether the volume of the buffer tank changes is further determined, and when the volume of the buffer tank changes, the fault can be found in time, so that the engine system can be maintained.
In addition, the correction coefficient determined by the method for monitoring the state of the gas buffer tank provided by the embodiment can be directly used for improving the control process of the pump gas when the buffer tank breaks down, so that the problem that the LNG pump is frequently short in stroke before maintenance and the service life of the LNG pump is shortened is solved.
FIG. 4 is a flow chart of another method for monitoring the condition of a gas buffer tank in an example, and referring to FIG. 4, as an embodiment, the method can also be:
s201, judging the opening and closing states of the pressure release valve.
S202, acquiring first gas quality of the gas buffer tank when the pressure relief valve is changed from a closed state to an open state.
In an exemplary embodiment, when the pressure relief valve is changed from a closed state to an open state, a pressure measurement value in the buffer tank is obtained and recorded as a first pressure, and a temperature measurement value in the buffer tank is obtained and recorded as a first temperature;
and determining the first gas quality corresponding to the first pressure and the first temperature by using a two-dimensional difference table according to the first pressure and the first temperature.
In the present embodiment, the two-dimensional difference table is determined by a calibration test.
S203, acquiring second gas quality of the gas buffer tank when the pressure relief valve is changed from the opening state to the closing state.
In an exemplary embodiment, when the pressure relief valve is changed from the open state to the closed state, a measured pressure value in the buffer tank is obtained and recorded as a second pressure, and a measured temperature value in the buffer tank is obtained and recorded as a second temperature;
and determining the second gas quality corresponding to the second pressure and the second temperature by using a two-dimensional difference table according to the second pressure and the second temperature.
And S204, calculating the third gas mass of the gas buffer tank when the pressure relief valve is in an opening state between two adjacent closing states.
S205, calculating the difference value between the first fuel gas quality and the second fuel gas quality.
And S206, calculating a correction coefficient through the difference and the third gas quality.
And S207, judging the running state of the engine.
For example, in the present embodiment, determining the operating state of the engine may include determining whether the rotation speed of the engine is within a set rotation speed range, determining whether the load of the engine is within a set load range, determining whether the operating duration of the engine is greater than a set duration, and the like.
For example, in one pumping cycle, determining whether the rotation speed of the engine is within the set rotation speed range may include: and judging whether the maximum rotating speed and the minimum rotating speed of the engine exceed set limits or not, and judging whether the difference value of the maximum rotating speed and the minimum rotating speed of the engine exceeds a set threshold or not.
For example, in the scheme, the purpose of judging the running state of the engine is to determine whether the engine fails or not and whether the gas consumption of the engine is in a stable state or not so as to avoid the problem that the buffer tank fails or not, but the correction coefficient shows that the buffer tank fails.
In an implementation, besides the operation state of the engine, the air supply state of the buffer tank can be judged, specifically: and judging whether the difference value between the maximum mass flow measurement value and the minimum mass flow test value of the buffer tank exceeds a set limit value or not.
For example, in the scheme, the purpose of judging the gas supply state of the buffer tank is to determine whether the mass flow sensor fails or whether the gas consumption of the engine is abnormal so as to avoid the problem that the buffer tank fails, but the correction coefficient shows that the buffer tank fails.
In one possible embodiment, in addition to determining the operating state of the engine, it may be further determined whether the second pressure is less than the first pressure.
For example, when the pressure relief valve is changed from the closed state to the open state, the measured pressure value in the buffer tank is a first pressure, the LNG pump stops pumping gas in the buffer tank, the natural gas in the buffer tank is in a consumption state, and normally, the pressure (second pressure) in the buffer tank should be smaller than the first pressure when the pressure relief valve is changed from the open state to the closed state.
In this scheme, judge whether second pressure is less than the aim at of first pressure, when judging that the relief valve changes from closed condition to the open mode, whether the natural gas in the buffer tank is in normal consumption state to avoid appearing the buffer tank and not breaking down, but the correction coefficient shows that the buffer tank has the problem of trouble.
And S208, if the running state of the engine is not in the set range, not recording the correction coefficient, otherwise, recording the correction coefficient.
For example, in this embodiment, the recorded correction coefficient may be the correction coefficient calculated in step S206, or may be an updated correction coefficient, and the manner of updating the correction coefficient is as follows:
faci＝kfac+(1-k)faci-1
in the above formula, fac is a correction coefficient for calculating the pumping cycle according to the difference and the third fuel gas quality, faciCorrection factor, fac, updated for the present pumping cyclei-1And k is a weight coefficient, and is a correction coefficient recorded in the last pumping cycle.
For example, when the air supply state requiring judgment buffering is set and whether the second pressure requiring judgment is smaller than the first pressure is set, if the running state of the engine is not in the set range, the difference value between the maximum mass flow measurement value and the minimum mass flow test measurement value exceeds the set limit value or the second pressure is larger than the first pressure, the correction coefficient is not recorded.
In an embodiment, after calculating or updating the correction coefficient, it may be further determined whether the correction coefficient of the current pumping cycle is abnormal according to the correction coefficient at the historical time, for example, if the correction coefficient of the current pumping cycle deviates significantly from the curve formed by the historical correction coefficients, it is determined that the correction coefficient of the current pumping cycle is abnormal, and the abnormal correction coefficient is not recorded.
And S209, determining whether the gas buffer tank is in fault or not through the latest correction coefficient.
Example two
Fig. 5 is a schematic diagram of a state monitoring device of a gas buffer tank in an embodiment, and referring to fig. 5, the embodiment provides the state monitoring device of the gas buffer tank, which includes a monitoring unit, where the monitoring unit includes a pressure release valve state monitoring module 1, a gas quality obtaining module 2, an integration module 3, and a correction coefficient calculating module 4.
The pressure relief valve state monitoring module 1 is used for judging the opening and closing state of the pressure relief valve.
The gas quality obtaining module 2 is used for obtaining first gas quality of the gas buffer tank when the pressure release valve is changed from the closed state to the open state, and obtaining second gas quality of the gas buffer tank when the pressure release valve is changed from the open state to the closed state.
The integration module 3 is used for calculating the third gas mass of the gas buffer tank when the pressure release valve is in an opening state between two adjacent closing states;
and the correction coefficient calculation module 4 is used for calculating a difference value between the first gas quality and the second gas quality, and updating the correction coefficient according to the difference value and the third gas quality.
The monitoring unit may further comprise an evaluation module for: judging the running state of the engine, judging the buffered air supply state and judging whether the second pressure is smaller than the first pressure.
For example, in this embodiment, the gas quality obtaining module 2 may obtain the first gas quality and the second gas quality by any one of the manners described in the first embodiment;
the specific operation mode of the integration module 3 is the same as the corresponding content described in the first embodiment;
the correction coefficient calculation module 4 may record or update the correction coefficient in any one of the manners described in the first embodiment.
The beneficial effects of the gas buffer tank state monitoring device provided in this embodiment are the same as the corresponding contents in the first embodiment, and are not described herein again.
EXAMPLE III
The embodiment provides a fuel gas buffer tank state monitoring system, which comprises a controller, wherein the controller is configured with an executable program, and when the executable program runs, the fuel gas buffer tank state monitoring method described in the first embodiment is realized.
The beneficial effects of the fuel gas buffer tank state monitoring system provided in this embodiment are the same as the corresponding contents in the first embodiment, and are not described herein again.
Example four
The present embodiment provides a storage medium storing an executable program, and the executable program implements any one of the methods for monitoring the state of a gas buffer tank described in the first embodiment when the executable program runs.
For example, a storage medium may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium.
The computer readable storage medium is not limited to electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method for monitoring the state of a gas buffer tank is characterized by comprising the following steps: judging the opening and closing state of the pressure release valve;
when the pressure release valve is changed from a closed state to an open state, acquiring first gas mass of the gas buffer tank, and when the pressure release valve is changed from the open state to the closed state, acquiring second gas mass of the gas buffer tank;
calculating the third gas mass of the gas buffer tank when the pressure release valve is in an opening state between two adjacent closing states;
calculating a difference value between the first fuel gas quality and the second fuel gas quality, and updating a correction coefficient according to the difference value and the third fuel gas quality;
the updated correction factor is used to determine whether the gas buffer tank is malfunctioning.
2. The gas buffer tank condition monitoring method of claim 1, wherein the first gas quality is determined based on a first pressure, a first temperature of the gas buffer tank;
and determining the second fuel gas quality according to the second pressure and the second temperature of the fuel gas buffer tank.
3. The gas buffer tank condition monitoring method of claim 2, wherein the first gas quality, the second gas quality are determined by a two-dimensional interpolation table.
4. The method of monitoring the condition of the gas buffer tank as recited in claim 1, further comprising determining an engine operating condition before updating the correction factor;
and if the running state of the engine is not in the set range, not updating the correction coefficient.
5. The method of claim 2, wherein updating the correction factor further comprises determining whether the second pressure is less than the first pressure;
and if the second pressure is greater than the first pressure, not updating the correction coefficient.
6. The method of monitoring the condition of a gas buffer tank as recited in claim 1, further comprising recording the correction factor at the historical time, and updating the correction factor based on the correction factor at the historical time and the correction factor calculated at the current time.
7. The method of monitoring the condition of a gas buffer tank as recited in claim 1, further comprising recording a correction factor for a historical time, the correction factor for the historical time being used to determine whether the calculated correction factor is abnormal.
8. The utility model provides a gas buffer tank state monitoring devices which characterized in that, includes the monitoring unit, the monitoring unit is used for:
judging the opening and closing state of the pressure release valve;
when the pressure release valve is changed from a closed state to an open state, acquiring first gas mass of the gas buffer tank, and when the pressure release valve is changed from the open state to the closed state, acquiring second gas mass of the gas buffer tank;
calculating the third gas mass of the gas buffer tank when the pressure release valve is in an opening state between two adjacent closing states;
and calculating a difference value between the first fuel gas quality and the second fuel gas quality, and updating the correction coefficient according to the difference value and the third fuel gas quality.
9. A gas buffer tank condition monitoring system comprising a controller configured with an executable program that when executed performs the gas buffer tank condition monitoring method of any one of claims 1 to 7.
10. A storage medium storing an executable program which when executed performs the method of monitoring the condition of a gas buffer tank as claimed in any one of claims 1 to 7.
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