CN110714847A - Leakage detection method for gas supply system of natural gas engine - Google Patents
Leakage detection method for gas supply system of natural gas engine Download PDFInfo
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- CN110714847A CN110714847A CN201910933160.4A CN201910933160A CN110714847A CN 110714847 A CN110714847 A CN 110714847A CN 201910933160 A CN201910933160 A CN 201910933160A CN 110714847 A CN110714847 A CN 110714847A
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- engine
- control unit
- electronic control
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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
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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
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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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- 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
- F02D2041/228—Warning displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a leakage detection method of a natural gas engine gas supply system, which is completed under the coordination of a stop valve, an injection valve and an electronic control unit ECU on the engine, when the engine or a whole vehicle runs in an overrun state, the injection valve is in a closed state, at the moment, the stop valve in the gas supply system is closed through the electronic control unit ECU, a closed channel is formed between the stop valve and the injection valve, the pressure in the channel is gas rail pressure, if no gas leakage occurs, the gas rail pressure is in a relatively stable value, the change of the gas rail pressure of the engine or the whole vehicle in the running state can be detected through the electronic control unit ECU, and compared with the stable value of the gas rail pressure in a normal non-leakage state, whether the gas supply system leaks can be judged according to the change, the method can automatically complete detection, judgment and alarm, the running state can be detected for many times when the running state is met in the driving cycle of the engine or the whole vehicle, and the running safety of the engine is greatly improved.
Description
Technical Field
The invention relates to the technical field of monitoring of an engine gas supply system, in particular to a leakage detection method of a natural gas engine gas supply system.
Background
The gas supply system of the natural gas engine mainly comprises a gas tank, a gas cut-off valve, a pressure stabilizer, a gas supply pipeline, a gas rail, an injection valve and other parts, wherein when any one part breaks down, natural gas can be leaked, waste of gas and pollution of air are caused, and more importantly, potential safety hazards exist in the operation of the engine. At present, the technical means for detecting gas leakage in the running process of an engine are various, for example, a gas sensor is arranged on the engine, the gas sensor is used for detecting related signals in gas, the related signals are processed by an Electronic Control Unit (ECU) of the engine and are compared with a preset standard value in the engine, whether the gas leakage phenomenon exists or not is judged according to the comparison result, and when the gas leakage phenomenon is judged to exist, the Electronic Control Unit (ECU) is used for driving corresponding components to give an alarm. The detection method is greatly influenced by the running environment of the engine, and if the air fluidity is good during the running of the engine, the leaked fuel gas is diffused quickly, so that the signal detected by the fuel gas sensor is weakened and is not enough to form an alarm signal, and the leakage phenomenon of the air supply system cannot be found in time.
In addition, two electromagnetic valves specially used for leakage detection are installed in the gas supply system in series and matched with the gas pressure sensor and the electronic control unit ECU to complete the leakage detection task, but the two electromagnetic valves need to be in a turn-off state during detection, so the detection method can only be used when the engine is not started. The method specifically comprises the following steps: after the electronic control unit ECU is electrified, the two electromagnetic valves are controlled to be switched off, the pressure value of the air supply pipeline is detected, and whether the air supply pipeline leaks or not is judged according to the gas pressure reduction speed, so that the detection mode can only ensure the safety of the air supply system before the engine is started, cannot detect the air supply system in the running process of the engine, and cannot ensure the safety of the air supply system in the running process of the engine, and therefore, the various leakage detection means need to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a leakage detection method of a natural gas engine gas supply system, which can be started for multiple times according to the running state of an engine in the running process of the engine, automatically finishes the detection process without human intervention, judges the detection result accurately and does not need to improve the existing hardware equipment.
In order to solve the technical problems, the technical scheme of the invention is as follows: a leakage detection method of a natural gas engine gas supply system is completed under the coordination of a stop valve, an injection valve and an electronic control unit ECU on an engine,
step one, electrifying the electronic control unit ECU and starting an engine;
the electronic control unit ECU judges whether the engine operates in an overrun state, if so, the next step is carried out, and if not, the electronic control unit ECU stays in the step to continue the circulation judgment;
step two, the engine enters an over run state, is in unpowered output under a towing working condition, the injection valve is in a closed state, the cut-off valve is controlled by the electronic control unit ECU to be closed, and a closed leakage detection pipeline is formed between the cut-off valve and the injection valve;
step three, the engine enters an overrun state and continues to be in T state1And second, the ECU starts to acquire the pressure value of the leakage detection pipeline and continuously acquires T2Second;
calculating T by using the ECU2The actual pressure variation A of the leakage detection pipeline within a second time period;
step four, presetting a pressure calibration variable quantity B for judging whether the air supply system has a leakage phenomenon in the electronic control unit ECU;
the electronic control unit ECU compares the pressure actual variation A with the pressure calibration variation B, and returns to the second step when the pressure actual variation A is smaller than the pressure calibration variation B; when the actual pressure variation A is larger than or equal to the calibrated pressure variation B, executing the next step;
and fifthly, reporting that the gas supply system has a leakage fault.
Preferably, in the first step, the ECU determines that the engine is in an overrun state when detecting that the accelerator opening signal is zero, the engine does not output external torque, and the engine speed is greater than a speed threshold.
As a preferred technical solution, the rotation speed threshold is a set value and is preset in the electronic control unit ECU.
As a preferred technical solution, the pressure value of the leakage detection pipeline is a gas rail pressure of an engine gas rail, and the actual variation a of the pressure is T2And in the second time period, the gas rail pressure difference from the timing starting time to the timing ending time.
As a preferable technical scheme, the pressure value of the leakage detection pipeline is detected in real time through a pressure sensor arranged in an engine air rail and is transmitted to the ECU.
As a preferable technical scheme, in the third step, T is1And T2Respectively are set values.
As an improvement to the above technical solution, in the fifth step, the leakage fault is reported through the electronic control unit ECU or/and the alarm device.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: when the engine or the whole vehicle runs in an overrun state, the injection valve is in a closed state, the cut-off valve in the gas supply system is closed through the electronic control unit ECU at the moment, a closed channel is formed between the cut-off valve and the injection valve, the pressure in the channel is the gas rail pressure, if no gas leakage occurs, the gas rail pressure is in a relatively stable value, the change of the gas rail pressure of the engine or the whole vehicle in the running state can be detected through the electronic control unit ECU, and compared with the stable value of the gas rail pressure in a normal leakage-free state, whether the gas supply system leaks can be judged accordingly, the method does not need to change the structure of the existing gas supply system of the engine when in use, automatically completes detection, judgment and alarm under the cooperation of the electronic control unit ECU, and can detect for multiple times when the running state is met in the driving cycle of the engine or the whole vehicle, the safety of the engine operation is greatly improved.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1, the leakage detection method of the natural gas engine air supply system is completed under the coordination of a stop valve, an injection valve and an electronic control unit ECU on the engine of the engine air supply system, and comprises the following steps,
step one, electrifying the electronic control unit ECU and starting an engine.
And judging whether the engine operates in an overrun state or not through the electronic control unit ECU, if so, entering the next step, and if not, staying in the step to continue the circular judgment.
In this step, when the ECU detects that the accelerator opening signal is zero, the engine has no external torque output, and the engine speed is greater than a speed threshold, it determines that the engine is in an overrun state, where the speed threshold is a set value and is preset in the ECU. When the engine is operated in the overrun state, the injection valve of the engine has no natural gas to spray, and the engine is generally operated in the overrun state during downhill or free-wheeling with the accelerator released, for example, during running of an automobile.
And step two, the engine enters an over run state and is in unpowered output under a towing working condition, the injection valve is in a closed state, the cut-off valve is controlled to be closed by the electronic control unit ECU, and a closed leakage detection pipeline is formed between the cut-off valve and the injection valve. Generally, when an engine air supply system leaks, two leakage points are most common, namely a pipeline between the stop valve and the air storage tank, and a pipeline between the stop valve and the injection valve.
The line pressure between the cut-off valve and the injection valve is small, even if leakage occurs, the leakage pressure is small, so the detection is difficult, and the detection needs long time.
Step three, the engine enters an overrun state and continues to be in T state1And second, the ECU starts to acquire the pressure value of the leakage detection pipeline and continuously acquires T2And second. The engine enters the overrun state for T1And after the second, the electronic control unit ECU starts to acquire the pressure value of the leakage detection pipeline, and the purpose of the method is to prevent the pressure fluctuation in the leakage detection pipeline from being large and the fault misjudgment from being generated when the engine just enters an overrun state or a stop valve is closed. By setting T1And the delayed starting time of second ensures that the pressure in the leakage detection pipeline is stable and then starts to judge, thereby completely avoiding the generation of fault misjudgment. Wherein the time period T1And time period T2Respectively are set values.
The embodiment calculates T by using the ECU2And in a second time period, the actual pressure variation A of the leakage detection pipeline. The pressure value of the leakage detection pipeline, namely the gas rail pressure of the engine gas rail, is detected in real time through a pressure sensor arranged in the engine gas rail and is transmitted to the electronic control unit ECU. The actual pressure variation A is T2And in the second time period, the gas rail pressure difference from the timing starting time to the timing ending time. Therefore, the actual pressure variation A is calculated only by subtracting the pressure values at two time points through the electronic control unit ECU, the calculation process is simple, the error is small, the speed is high, and the quick output of the judgment result of the gas leakage fault is facilitated.
And step four, presetting a pressure calibration variable quantity B for judging whether the air supply system has a leakage phenomenon in the electronic control unit ECU. The electronic control unit ECU compares the pressure actual variation A with the pressure calibration variation B, and returns to the second step when the pressure actual variation A is smaller than the pressure calibration variation B; and when the actual pressure variation A is larger than or equal to the calibrated pressure variation B, executing the next step. The step is a direct comparison process of numerical values, and whether the gas leakage fault exists can be directly judged according to the comparison result.
And fifthly, a leakage fault is reported out of the gas supply system, and the leakage fault can be reported out through the ECU or/and the alarm device.
When the engine or the whole vehicle runs in the overrun state, the injection valve is in the closed state, the cut-off valve in the gas supply system is closed through the electronic control unit ECU at the moment, a closed channel is formed between the cut-off valve and the injection valve, the pressure in the channel is the gas rail pressure, if no gas leakage occurs, the gas rail pressure is in a relatively stable value, the change of the gas rail pressure of the engine or the whole vehicle in the running state can be detected through the electronic control unit ECU, and compared with the stable value of the gas rail pressure in the normal non-leakage state, whether the gas supply system leaks can be judged accordingly, the method does not need to change the structure of the existing gas supply system of the engine when in use, automatically finishes detection, judgment and alarm under the cooperation of the electronic control unit ECU, and can detect for a plurality of times when the running state is met in the driving cycle of the engine or the whole vehicle, the safety of the engine operation is greatly improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The leakage detection method of the natural gas engine gas supply system is completed under the coordination of a stop valve, an injection valve and an electronic control unit ECU on the engine, and is characterized in that: comprises the following steps of (a) carrying out,
step one, electrifying the electronic control unit ECU and starting an engine;
the electronic control unit ECU judges whether the engine operates in an overrun state, if so, the next step is carried out, and if not, the electronic control unit ECU stays in the step to continue the circulation judgment;
step two, the engine enters an over run state, is in unpowered output under a towing working condition, the injection valve is in a closed state, the cut-off valve is controlled by the electronic control unit ECU to be closed, and a closed leakage detection pipeline is formed between the cut-off valve and the injection valve;
step three, the engine enters an overrun state and continues to be in T state1And second, the ECU starts to acquire the pressure value of the leakage detection pipeline and continuously acquires T2Second;
calculating T by using the ECU2The actual pressure variation A of the leakage detection pipeline within a second time period;
step four, presetting a pressure calibration variable quantity B for judging whether the air supply system has a leakage phenomenon in the electronic control unit ECU;
the electronic control unit ECU compares the pressure actual variation A with the pressure calibration variation B, and returns to the second step when the pressure actual variation A is smaller than the pressure calibration variation B; when the actual pressure variation A is larger than or equal to the calibrated pressure variation B, executing the next step;
and fifthly, reporting that the gas supply system has a leakage fault.
2. A method of leak detection in a gas supply system to a natural gas engine as claimed in claim 1, wherein: in the first step, when the electronic control unit ECU detects that an accelerator opening signal is zero, no external torque is output from the engine, and the engine speed is greater than a speed threshold, the engine is determined to be in an overrun state.
3. A method of leak detection in a gas supply system to a natural gas engine as claimed in claim 2, wherein: the rotating speed threshold value is a set value and is preset in the electronic control unit ECU.
4. A method of leak detection in a gas supply system to a natural gas engine as claimed in claim 1, wherein: the pressure value of the leakage detection pipeline is the gas rail pressure of the engine gas rail, and the actual pressure variation A is T2And in the second time period, the gas rail pressure difference from the timing starting time to the timing ending time.
5. A method of leak detection in a gas supply system to a natural gas engine as claimed in claim 4, wherein: and the pressure value of the leakage detection pipeline is detected in real time by a pressure sensor arranged in an engine air rail and is transmitted to the electronic control unit ECU.
6. A method of leak detection in a gas supply system to a natural gas engine as claimed in claim 1, wherein: in the third step, T1And T2Respectively are set values.
7. A method of leak detection in a gas supply system to a natural gas engine as claimed in claim 1, wherein: and in the fifth step, the leakage fault is reported through the electronic control unit ECU or/and the alarm device.
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| CN201910933160.4A CN110714847A (en) | 2019-09-29 | 2019-09-29 | Leakage detection method for gas supply system of natural gas engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111237110A (en) * | 2020-03-27 | 2020-06-05 | 潍柴动力股份有限公司 | Method and device for detecting internal leakage of engine injection valve |
| CN115750120A (en) * | 2022-12-20 | 2023-03-07 | 潍柴动力股份有限公司 | Gas leakage detection method and device, vehicle and storage medium |
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Application publication date: 20200121 |