CN111156098A - Engine leakage detection method, detection device and detection system - Google Patents
Engine leakage detection method, detection device and detection system Download PDFInfo
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- CN111156098A CN111156098A CN201911407629.7A CN201911407629A CN111156098A CN 111156098 A CN111156098 A CN 111156098A CN 201911407629 A CN201911407629 A CN 201911407629A CN 111156098 A CN111156098 A CN 111156098A
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- low
- pressure value
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- pressure
- leakage
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Classifications
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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
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0293—Safety devices; Fail-safe measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
-
- 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
- F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
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- 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
-
- 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
- Y02T10/40—Engine management systems
Abstract
The invention belongs to the technical field of vehicle engines, and particularly relates to a detection method, a detection device and a detection system for engine leakage. The method for detecting the leakage of the engine comprises the following steps: acquiring the current pressure value of the air rail in a vacuum state; and judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail is not less than the preset pressure value. According to the method for detecting the leakage of the engine, negative pressure can be formed in the low-pressure pipe assembly in a vacuum state, the change of the pressure of the low-pressure pipe assembly is recorded, if the current pressure value is larger than or equal to the preset pressure value, the leakage of the low-pressure pipe assembly can be judged quickly, and the safety is improved.
Description
Technical Field
The invention belongs to the technical field of vehicle engines, and particularly relates to a detection method, a detection device and a detection system for engine leakage.
Background
When the natural gas engine normally works, the low-pressure gas pipeline and the fuel cut-off valve are easy to leak, the existing leakage detection is troublesome, and the safety is lower.
Disclosure of Invention
The invention aims to at least solve the problems that the existing engine low-pressure gas pipeline and the existing fuel cut-off valve are easy to leak, and the existing leakage detection is troublesome. The purpose is realized by the following technical scheme:
a first aspect of the present invention proposes a method for detecting engine leakage, wherein the method comprises the steps of:
acquiring the current pressure value of the air rail in a vacuum state;
and judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail is not less than the preset pressure value.
According to the method for detecting the leakage of the engine, negative pressure can be formed in the low-pressure pipe assembly in a vacuum state, the change of the pressure of the low-pressure pipe assembly is recorded, if the current pressure value is larger than or equal to the preset pressure value, the leakage of the low-pressure pipe assembly can be judged quickly, and the safety is improved.
In addition, the method for detecting engine leakage according to the present invention may further have the following additional technical features:
in some embodiments of the present invention, the determining that the low pressure pipe assembly leaks according to that the current pressure value of the air rail is not less than the preset pressure value includes:
judging that the cut-off valve is leaked according to the fact that the current pressure value of the gas rail is larger than the preset pressure value;
and judging that the low-pressure pipe leaks when the current pressure value of the air rail is equal to the preset pressure value.
In some embodiments of the invention, the vacuum state comprises:
closing the cut-off valve after the cut-off valve opening time reaches a first preset time;
the fuel source is shut off for a second predetermined time.
In some embodiments of the invention, the fuel cut source comprises:
the valve connected to the fuel source is closed.
In some embodiments of the present invention, the determining that the low pressure pipe assembly leaks according to that the current pressure value of the air rail is not less than the preset pressure value includes:
and judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail is not less than the atmospheric pressure value.
In another aspect of the present invention, an engine leakage detection device is provided, wherein the engine leakage detection device is configured to execute the above engine leakage detection method, and the engine leakage detection device includes: an acquisition unit and a judgment unit, wherein:
the acquisition unit is used for acquiring the current pressure value of the air rail in a vacuum state;
and the judging unit is used for judging that the low-pressure pipe assembly leaks according to the condition that the current pressure value of the air rail is not less than the preset pressure value.
The invention also provides a system for detecting the leakage of the engine, which comprises a memory and the device for detecting the leakage of the engine, wherein the memory stores instructions of the method for detecting the leakage of the engine;
the fuel tank and the low-pressure pipe assembly are sequentially connected;
the fuel tank is used for providing a fuel source, and the low-pressure pipe assembly is provided with a pressure sensor.
In some embodiments of the invention, the low pressure pipe assembly comprises a shut-off valve and a low pressure pipe connected in turn to the fuel tank, the pressure sensor being provided on the low pressure pipe.
In some embodiments of the invention, the low pressure pipe is connected to an air rail, and the pressure sensor is disposed on the air rail.
In some embodiments of the invention, the fuel tank communicates with a shut-off valve via a high-pressure pipe, and a valve is provided between the fuel tank and the high-pressure pipe.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 schematically illustrates a flow chart of a method of detecting engine leakage according to an embodiment of the present invention;
FIG. 2 schematically illustrates a logic control block diagram of a method of detecting engine leakage according to an embodiment of the present invention;
FIG. 3 schematically shows a block diagram of an engine leakage detection apparatus according to an embodiment of the present invention;
fig. 4 schematically shows a connection configuration diagram of an engine leakage detection system according to an embodiment of the present invention.
1: an acquisition unit; 2: a judgment unit;
12: a fuel tank; 13: a low pressure pipe; 14: an air rail; 15: a pressure sensor; 16: and (4) a valve.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The invention provides a method for detecting leakage of an engine, which is used for detecting whether a low-pressure pipe assembly of the engine leaks or not.
As shown in fig. 1 and 2, the method for detecting engine leakage in the present embodiment includes the steps of:
s1, acquiring the current pressure value of the air rail 14 in the vacuum state;
and S2, judging the leakage of the low-pressure pipe assembly according to the fact that the current pressure value of the air rail 14 is not less than the preset pressure value.
According to the method for detecting the leakage of the engine, negative pressure can be formed in the low-pressure pipe assembly in a vacuum state, the change of the pressure of the low-pressure pipe assembly is recorded, if the current pressure value is larger than or equal to the preset pressure value, the leakage of the low-pressure pipe assembly can be judged quickly, and the safety is improved.
In some embodiments of the present invention, determining that the low pressure pipe assembly leaks according to that the current pressure value of the air rail 14 is not less than the preset pressure value includes:
judging that the cut-off valve is leaked according to the fact that the current pressure value of the gas rail 14 is larger than the preset pressure value;
and judging that the low-pressure pipe 13 leaks according to the fact that the current pressure value of the air rail 14 is equal to the preset pressure value.
In some embodiments of the invention, the vacuum state comprises:
closing the cut-off valve after the cut-off valve opening time reaches a first preset time;
the fuel source is shut off for a second predetermined time.
In some embodiments of the invention, shutting off the fuel source comprises:
The engine is dragged backwards by the starter for a period of time to consume the gas in the low-pressure pipeline 13, and at the moment, if no leakage exists in the gas cut-off valve and the low-pressure pipeline 13, negative pressure can be formed in the low-pressure gas pipeline.
In some embodiments of the present invention, determining that the low pressure pipe assembly leaks according to that the current pressure value of the air rail 14 is not less than the preset pressure value includes:
and judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail 14 is not less than the atmospheric pressure value.
As shown in fig. 3, another aspect of the present invention also provides an engine leakage detection apparatus for performing the above-described engine leakage detection method, the apparatus comprising: an acquisition unit 1 and a judgment unit 2, wherein:
the acquiring unit 1 is used for acquiring the current pressure value of the air rail 14 in a vacuum state;
and the judging unit 2 is used for judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail 14 is not less than the preset pressure value.
As shown in fig. 4, another aspect of the present invention further provides an engine leakage detection system, which comprises a memory and the above-mentioned engine leakage detection device, wherein the memory stores instructions of the above-mentioned engine leakage detection method;
the low-pressure pipe assembly is connected with the fuel tank 12 in sequence;
the fuel tank 12 is used to provide a source of fuel and the low pressure pipe assembly is provided with a pressure sensor 15.
In some embodiments of the invention, the low pressure pipe assembly comprises a shut-off valve and a low pressure pipe 13 connected in turn to the fuel tank 12, and the pressure sensor 15 is provided on the low pressure pipe 13.
In some embodiments of the present invention, the low pressure tube 13 is connected to the air rail 14, and the pressure sensor 15 is disposed on the air rail 14.
In some embodiments of the invention, the fuel tank 12 communicates with the shut-off valve via a high-pressure pipe, and a valve 16 is provided between the fuel tank 12 and the high-pressure pipe.
In the detection system for the leakage of the engine, complex equipment does not need to be additionally arranged, and the leakage can be detected on the basis of the existing configuration of the engine and the whole vehicle only by arranging the pressure sensor 15 on the air rail 14, so that the cost is saved.
The method for detecting the leakage of the engine comprises the steps of firstly opening the valve 16, opening the fuel cut-off valve after the ECU is electrified, keeping the fuel cut-off valve for a period of time and closing the fuel cut-off valve to enable the whole gas pipeline to be filled with natural gas, and then closing the valve 16. At the moment, an engine starting request is given, the engine is dragged backwards by the starter for a period of time, the gas in the low-pressure pipeline 13 is consumed, and at the moment, if no leakage exists in the gas cut-off valve and the low-pressure pipeline 13, negative pressure can be formed in the low-pressure gas pipeline. After the engine is stopped, the pressure change of the pressure sensor 15 is recorded for a period of time, if the pressure is constant under negative pressure all the time, the fuel cut-off valve and the low-pressure pipe 13 are not leaked, if the pressure is equal to the external atmospheric pressure, the low-pressure pipe 13 is leaked, and if the pressure is greater than the external atmospheric pressure, the gas cut-off valve is leaked. According to the detection result, the problem can be rapidly positioned by maintenance personnel.
In summary, in the method for detecting leakage of an engine according to the present invention, when the low pressure pipe assembly is in a vacuum state, negative pressure is formed in the low pressure pipe assembly, a change in pressure of the low pressure pipe assembly is recorded, and if the current pressure value is greater than or equal to the preset pressure value, it is determined that the low pressure pipe assembly is leaking, and therefore, the safety can be improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method of detecting engine leakage, said method comprising the steps of:
acquiring the current pressure value of the air rail in a vacuum state;
and judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail is not less than the preset pressure value.
2. The method for detecting leakage of an engine according to claim 1, wherein the determining leakage of the low-pressure pipe assembly according to whether the current pressure value of the air rail is not less than a preset pressure value comprises:
judging that the cut-off valve is leaked according to the fact that the current pressure value of the gas rail is larger than the preset pressure value;
and judging that the low-pressure pipe leaks when the current pressure value of the air rail is equal to the preset pressure value.
3. The method of detecting engine leakage according to claim 1, wherein the vacuum state includes:
closing the cut-off valve after the cut-off valve opening time reaches a first preset time;
the fuel source is shut off for a second predetermined time.
4. The method of detecting engine leakage according to claim 3, wherein said shutting off a fuel source comprises:
the valve connected to the fuel source is closed.
5. The method for detecting leakage of an engine according to claim 1, wherein the determining leakage of the low-pressure pipe assembly according to whether the current pressure value of the air rail is not less than a preset pressure value comprises:
and judging that the low-pressure pipe assembly leaks according to the fact that the current pressure value of the air rail is not less than the atmospheric pressure value.
6. An engine leak detection device for executing the engine leak detection method according to claim 1, characterized by comprising: an acquisition unit and a judgment unit, wherein:
the acquisition unit is used for acquiring the current pressure value of the air rail in a vacuum state;
and the judging unit is used for judging that the low-pressure pipe assembly leaks according to the condition that the current pressure value of the air rail is not less than the preset pressure value.
7. A detection system of engine leakage, comprising a memory in which instructions of the detection method of engine leakage according to any one of claims 1 to 5 are stored, and the detection device of engine leakage according to claim 6;
the fuel tank and the low-pressure pipe assembly are sequentially connected;
the fuel tank is used for providing a fuel source, and the low-pressure pipe assembly is provided with a pressure sensor.
8. The engine leak detection system according to claim 7,
the low-pressure pipe assembly comprises a stop valve and a low-pressure pipe which are sequentially connected with the fuel tank, and the pressure sensor is arranged on the low-pressure pipe.
9. The engine leak detection system of claim 8, wherein the low pressure tube is connected to an air rail, and the pressure sensor is disposed on the air rail.
10. The engine leak detection system according to claim 8, wherein the fuel tank communicates with a shut-off valve via a high-pressure pipe, and a valve is provided between the fuel tank and the high-pressure pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407629.7A CN111156098A (en) | 2019-12-31 | 2019-12-31 | Engine leakage detection method, detection device and detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407629.7A CN111156098A (en) | 2019-12-31 | 2019-12-31 | Engine leakage detection method, detection device and detection system |
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| Publication Number | Publication Date |
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| CN111156098A true CN111156098A (en) | 2020-05-15 |
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| CN201911407629.7A Pending CN111156098A (en) | 2019-12-31 | 2019-12-31 | Engine leakage detection method, detection device and detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096542A (en) * | 2020-09-23 | 2020-12-18 | 潍柴动力股份有限公司 | Method and device for detecting air supply of hydraulic pump |
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| US20140111327A1 (en) * | 2012-10-23 | 2014-04-24 | Srini Naidu | Methods and apparatuses for diagnosing leaks in a compressed natural gas delivery system |
| CN104047739A (en) * | 2013-03-15 | 2014-09-17 | 福特环球技术公司 | System and method for closing fuel tank valve |
| CN106150730A (en) * | 2015-05-11 | 2016-11-23 | 福特环球技术公司 | For the method detecting the leakage in inlet manifold |
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2019
- 2019-12-31 CN CN201911407629.7A patent/CN111156098A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110033476A (en) * | 2009-09-25 | 2011-03-31 | 한국기계연구원 | Regulator for compressed natural gas vehicle having leakage fuel gas detecting and collecting functions |
| US20140111327A1 (en) * | 2012-10-23 | 2014-04-24 | Srini Naidu | Methods and apparatuses for diagnosing leaks in a compressed natural gas delivery system |
| CN104047739A (en) * | 2013-03-15 | 2014-09-17 | 福特环球技术公司 | System and method for closing fuel tank valve |
| CN106150730A (en) * | 2015-05-11 | 2016-11-23 | 福特环球技术公司 | For the method detecting the leakage in inlet manifold |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112096542A (en) * | 2020-09-23 | 2020-12-18 | 潍柴动力股份有限公司 | Method and device for detecting air supply of hydraulic pump |
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