CN115031974A - Method and system for testing reliability of natural gas engine - Google Patents
Method and system for testing reliability of natural gas engine Download PDFInfo
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- CN115031974A CN115031974A CN202210706039.XA CN202210706039A CN115031974A CN 115031974 A CN115031974 A CN 115031974A CN 202210706039 A CN202210706039 A CN 202210706039A CN 115031974 A CN115031974 A CN 115031974A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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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
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Abstract
The invention discloses a method and a system for checking the reliability of a natural gas engine, wherein the method for checking the reliability of the natural gas engine comprises the following steps: controlling the outlet water temperature of the natural gas engine to be in a thermal state working condition area within a first preset time, and working at the rotating speed of the maximum net power and full load; controlling the temperature of the outlet water of the natural gas engine to enter a cold state working condition area within a second preset time when the temperature range of the hot state working condition area is 105-110 ℃, keeping the rotating speed of the maximum net power, reducing the load from full load to zero load, and keeping a third preset time; the temperature range of the cold working condition area is 25-30 ℃, and the load of the natural gas engine is controlled to be increased from zero load to full load and the rotating speed of the maximum net power is kept within the fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area. The maximum measurement of the engine can be realized by utilizing the temperature difference in the cold and hot states, and the simulation of the possible actual conditions is fully met.
Description
Technical Field
The invention relates to the technical field of engine inspection, in particular to a method and a system for inspecting the reliability of a natural gas engine.
Background
The natural gas engine needs to perform function and durability verification on all parts during development, wherein a cylinder cover is the most core and complex working part of the engine, a combustion chamber, a piston and a cylinder sleeve jointly form a working medium combustion and work-doing space of the engine, an air inlet passage and an air outlet passage are responsible for gas exchange and air flow organization, and a water jacket is responsible for organizing water flow to cool the cylinder cover. Therefore, the implementation of the cylinder head function is determined by a plurality of physical fields. In view of the above, the verification of the cylinder cover needs to be comprehensive and deep, and mainly verifies the performances of the cylinder cover, such as high and low temperature shock resistance, thermal expansion and cold contraction resistance, aging speed of materials and finished products, and the like. As a power-assisted part of an engine, the supercharger is in a cold and hot alternating environment for a long time, and the performances of high and low temperature shock resistance, thermal expansion and cold contraction resistance, aging speed of materials and finished products and the like of the supercharger need to be verified.
Due to the current emission requirements, the combustion state of the natural gas engine is from lean combustion to equivalence ratio combustion, the overall combustion temperature is raised, and new reliability requirements are provided for the reliability of a cylinder cover and a supercharger. The road condition which has the most severe influence on the reliability of the cylinder cover and the supercharger is a mountain road, a vehicle can go up a mountain and go down a mountain for a while, and the working environment of the engine is also a hot state and a cold state, even the engine is stopped.
In summary, how to implement the check on the reliability of the natural gas engine is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for checking the reliability of a cylinder head and a supercharger of a natural gas engine, which can verify the reliability of the cylinder head and the supercharger and obtain the best checking effect.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method of verifying natural gas engine reliability, comprising:
controlling the outlet water temperature of the natural gas engine to be in a thermal state working condition area within a first preset time, and working at the rotating speed of the maximum net power and full load; the temperature range of the hot working condition area is 105-110 ℃;
controlling the outlet water temperature of the natural gas engine to enter a cold working condition area within a second preset time, keeping the rotating speed of the maximum net power, reducing the load from the full load to zero load, and keeping a third preset time; the temperature range of the cold working condition area is 25-30 ℃;
controlling the speed of the natural gas engine to maintain the maximum net power while the load is increased from the zero load to a full load for a fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area.
Preferably, the temperature of the hot working condition area is 105 degrees, and the temperature of the cold working condition area is 30 degrees.
Preferably, the first preset time, the second preset time, the third preset time and the fourth preset time are consecutive, and the total of the first preset time, the second preset time, the third preset time and the fourth preset time ranges from 620 seconds to 700 seconds.
Preferably, the first preset time ranges from 220 seconds to 260 seconds;
the second preset time ranges from 25 seconds to 35 seconds;
the third preset time ranges from 340 seconds to 380 seconds;
the fourth preset time ranges from 25 seconds to 35 seconds.
Preferably, the step of controlling the outlet water temperature of the natural gas engine to be in the hot working condition area is performed while the counting number is increased by one, and when the counting number reaches the target number, the step of stopping and not returning to the step of controlling the outlet water temperature of the natural gas engine to be in the hot working condition area is performed.
A system for verifying the reliability of a natural gas engine, comprising:
the signal transmission equipment is used for connecting the natural gas engine;
the controller is used for sending a control signal to the signal transmission equipment, wherein the control signal comprises a first preset time, controls the outlet water temperature of the natural gas engine to be in a hot working condition area, and works at the rotating speed of the maximum net power and the full load; the temperature range of the hot working condition area is 100-110 ℃; controlling the outlet water temperature of the natural gas engine to enter a cold working condition area within a second preset time, keeping the rotating speed of the maximum net power, reducing the load from the full load to zero load, and keeping a third preset time; the temperature range of the cold working condition area is 25-35 ℃; controlling the speed of the natural gas engine to maintain the maximum net power while the load is increased from the zero load to a full load for a fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area.
Preferably, the temperature of the hot working condition area is 105 degrees, and the temperature of the cold working condition area is 30 degrees.
Preferably, the first preset time ranges from 220 seconds to 260 seconds;
the second preset time ranges from 25 seconds to 35 seconds;
the third preset time ranges from 340 seconds to 380 seconds;
the fourth preset time ranges from 25 seconds to 35 seconds.
Preferably, the system further comprises a time counter, when the step of controlling the outlet water temperature of the natural gas engine to be in the hot working condition area is returned, the controller sends a signal to the time counter to enable the number of times counted to be increased by one, and when the number of times counted reaches the target number, the system stops and does not return to the step of controlling the outlet water temperature of the natural gas engine to be in the hot working condition area.
In the scheme provided by the invention, the temperature of the cold state working condition area of the engine can reach 25-30 ℃, the value is obviously lower than the normal temperature, the maximum temperature difference formed between the hot state and the cold state can reach 75-85 ℃, the maximum measurement of the engine can be realized by utilizing the temperature difference between the cold state and the hot state, and the simulation of the actual condition which can occur under the existing condition is fully met. In addition, the method sets that the load is adjusted from full load to zero load under the condition of stable rotating speed with maximum net power, the actual working condition of the engine can be fully simulated, not only can the cylinder cover be verified, but also the supercharger can be verified simultaneously, the reliability verification of the cylinder cover in the development stage is further carried out, and the product quality brought to the market is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, 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 of a method of verifying the reliability of a natural gas engine provided by the present invention;
FIG. 2 is a schematic diagram illustrating the procedure of the method for verifying the reliability of a natural gas engine provided by the present invention;
fig. 3 is a line graph of test conditions of the method for verifying the reliability of the natural gas engine provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The core of the invention is to provide a method and a system for testing the reliability of a natural gas engine, which can verify the reliability of a cylinder cover and a supercharger and obtain the most accurate and optimal testing effect.
Referring to fig. 1 to 3, the present application provides a method for checking reliability of a natural gas engine, which is mainly used for checking reliability of the natural gas engine, and specifically includes the following steps:
step S1, controlling the outlet water temperature of the natural gas engine to be in a hot working condition area within a first preset time, and working at the rotating speed of the maximum net power and at full load;
step S2, controlling the outlet water temperature of the natural gas engine to enter a cold state working condition area within a second preset time, keeping the rotating speed of the maximum net power, reducing the load from full load to zero load, and keeping a third preset time;
step S3, controlling the load of the natural gas engine to rise from zero load to full load and keeping the rotating speed of the maximum net power in the fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area.
It should be noted that the first preset time, the second preset time, the third preset time, and the fourth preset time are all time periods and are set continuously.
In step S1, the thermal state operating region refers to a state of the operating environment with the maximum thermal load under the operating condition of the natural gas engine, and is set mainly with reference to the exhaust temperature, which is the temperature of the gas generated after combustion of the natural gas engine.
In step S2, the cold state operating region refers to a state of the operating environment with a low thermal load under the natural gas engine operating condition, and is set mainly with reference to the exhaust gas temperature.
The outlet water temperature of the natural gas engine refers to the outlet water temperature of the engine.
The rotating speed of the maximum net power refers to the rotating speed corresponding to the maximum power output of the engine.
In the above steps, the temperature range of the hot working condition region is 105 to 110 degrees, and the temperature range of the cold working condition region is 25 to 30 degrees. That is to say, the water outlet temperature of the natural gas engine refers to the temperature of the water outlet of the engine, the temperature of a cold working condition area of the engine can reach 25-30 ℃, the value is obviously lower than the normal temperature, the maximum temperature difference formed between a hot state and a cold state can reach 75-85 ℃, the maximum measurement of the engine can be realized by utilizing the temperature difference between the cold state and the hot state, and the simulation of the actual condition which can occur under the existing condition is fully met. In addition, the method sets that the load is adjusted from full load to zero load under the condition of stable rotating speed with maximum net power, the actual working condition of the engine can be fully simulated, not only can the cylinder cover be verified, but also the supercharger can be verified simultaneously, the reliability verification of the cylinder cover in the development stage is further carried out, and the product quality brought to the market is ensured.
Specifically, the temperature of the hot zone was 105 degrees, and the temperature of the cold zone was 30 degrees. Therefore, the temperature difference of the cold state and the hot state can reach 75 ℃, the state in the actual use process is more met, and the inspection result can be close to reality.
In a specific embodiment, the first preset time, the second preset time, the third preset time and the fourth preset time are continuously set, and the sum of the four is in a range from 620 seconds to 700 seconds. In the actual detection process, the first preset time is sequentially subjected to the second preset time, the third preset time and the fourth preset time, and the first preset time is returned, and the reliability and durability test can be completed after 7000-9000 times of cyclic detection for one cycle.
Optionally, the first preset time ranges from 220 seconds to 260 seconds; the second preset time ranges from 25 seconds to 35 seconds; the third preset time ranges from 340 seconds to 380 seconds; the fourth preset time ranges from 25 seconds to 35 seconds. The total length of time may be about 660 seconds, which requires 8000 reliability endurance tests in total.
And when the number of the counting times reaches the target number, stopping and not controlling the outlet water temperature of the natural gas engine to be in the hot working condition area again.
In a specific embodiment, firstly, the natural gas engine is kept running for 240 seconds under the working condition (thermal state) that the rotating speed of the maximum net power is 100% load state and the water outlet temperature is 105 ℃ so as to simulate the climbing state;
then, the natural gas engine is transited from the rotating speed of the maximum net power and 100% load to the rotating speed of the maximum net power and 0% load state in 30 seconds in total;
then, the natural gas engine keeps running for 360 seconds under the working conditions of the rotating speed of the maximum net power, 0% load and 30 ℃ of water outlet temperature in a cold state so as to simulate a downhill state;
then, the natural gas engine is transitioned from the maximum net power speed and 0% load state to the maximum net power speed and 100% load state for a period of 30 seconds and fed back to the first step.
In the above cycle, the whole cycle is 660 seconds, and 8000 times (about 1467h) of reliability endurance tests are required in total.
In addition to the method for verifying the reliability of the natural gas engine provided in each of the above embodiments, the present invention also provides a system for verifying the reliability of a natural gas engine, which is capable of verifying the reliability of a cylinder head and a supercharger of the natural gas engine. The application provides a system for verifying natural gas engine reliability, includes:
the signal transmission equipment is used for connecting the natural gas engine;
the controller is used for sending a control signal to the signal transmission equipment, wherein the control signal comprises a first preset time period, controls the outlet water temperature of the natural gas engine to be in a thermal state working condition area, and works at the rotating speed of the maximum net power and the full load; the system is used for controlling the temperature of the outlet water of the natural gas engine to enter a cold working condition area within a second preset time, keeping the rotating speed of the maximum net power, reducing the load from full load to zero load and keeping a third preset time; a rotating speed for controlling the load of the natural gas engine to be increased from zero load to full load and simultaneously maintaining the maximum net power within a fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area.
The steps executed by the controller can refer to the description of the method for verifying the reliability of the natural gas engine in the embodiment.
The temperature of the outlet water of the engine is set to be 30 ℃, so that the cold environment temperature of the engine is lower, and the reliability of a cylinder cover and a supercharger can be verified.
Optionally, the temperature range of the hot working condition region is 100 to 110 degrees, and the temperature range of the cold working condition region is 25 to 35 degrees.
Optionally, the first preset time ranges from 220 seconds to 260 seconds; the second preset time ranges from 25 seconds to 35 seconds; the third preset time ranges from 340 seconds to 380 seconds; the fourth preset time ranges from 25 seconds to 35 seconds.
The system for checking the reliability of the natural gas engine further comprises a time counter.
And when the step of controlling the outlet water temperature of the natural gas engine to be in the hot working condition area is returned, the controller sends a signal to the time counter so as to increase the number of times of counting by one, and when the number of times of counting reaches the target number, the controller stops and does not return to control the outlet water temperature of the natural gas engine to be in the hot working condition area.
The structure of other parts of the system for checking the reliability of the natural gas engine refers to the prior art, and is not described in detail herein.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The method and system for verifying the reliability of a natural gas engine provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A method of verifying the reliability of a natural gas engine, comprising:
controlling the outlet water temperature of the natural gas engine to be in a thermal state working condition area within a first preset time, and working at the rotating speed of the maximum net power and full load; the temperature range of the hot working condition area is 100-110 ℃;
controlling the outlet water temperature of the natural gas engine to enter a cold working condition area within second preset time, keeping the rotating speed of the maximum net power, reducing the load from the full load to zero load, and keeping third preset time; the temperature range of the cold working condition area is 25-35 ℃;
controlling the speed of the natural gas engine to maintain the maximum net power while the load is increased from the zero load to a full load for a fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area.
2. The method of verifying natural gas engine reliability of claim 1 wherein the temperature of the hot operating region is 105 degrees and the temperature of the cold operating region is 30 degrees.
3. The method of verifying natural gas engine reliability as claimed in claim 1, wherein the first preset time, the second preset time, the third preset time and the fourth preset time are consecutive, and the sum of the four is in a range of 620 seconds to 700 seconds.
4. The method of testing the reliability of a natural gas engine according to claim 3, wherein the first preset time is in a range of 220 seconds to 260 seconds;
the second preset time ranges from 25 seconds to 35 seconds;
the third preset time ranges from 340 seconds to 380 seconds;
the fourth preset time ranges from 25 seconds to 35 seconds.
5. The method for verifying natural gas engine reliability as claimed in claim 1 wherein the step of returning the leaving water temperature of the controlled natural gas engine to the hot operating region further comprises adding one to a count number, and when the count number reaches a target number, stopping and not returning the leaving water temperature of the controlled natural gas engine to the hot operating region.
6. A system for verifying the reliability of a natural gas engine, comprising:
the signal transmission equipment is used for connecting the natural gas engine;
the controller is used for sending a control signal to the signal transmission equipment, wherein the control signal comprises a first preset time period, controls the outlet water temperature of the natural gas engine to be in a thermal state working condition area, and works at the rotating speed with the maximum net power and at full load; the temperature range of the hot working condition area is 100-110 ℃;
controlling the outlet water temperature of the natural gas engine to enter a cold working condition area within a second preset time, keeping the rotating speed of the maximum net power, reducing the load from the full load to zero load, and keeping a third preset time; the temperature range of the cold working condition area is 25-35 ℃;
controlling the speed of the natural gas engine to maintain the maximum net power while the load is increased from the zero load to a full load for a fourth preset time; and returning to the step of controlling the outlet water temperature of the natural gas engine to be in the thermal state working condition area.
7. The system for verifying natural gas engine reliability of claim 6, wherein the temperature of the hot operating condition region is 105 degrees and the temperature range of the cold operating condition region is 30 degrees.
8. The system for verifying natural gas engine reliability of claim 6, wherein said first predetermined time is in a range of 220 seconds to 260 seconds;
the second preset time ranges from 25 seconds to 35 seconds;
the third preset time ranges from 340 seconds to 380 seconds;
the fourth preset time ranges from 25 seconds to 35 seconds.
9. The system for verifying the authenticity of a natural gas engine as claimed in any one of claims 6 to 8, further comprising a time counter, said controller sending a signal to said time counter to increment its count number by one when returning said step of controlling the leaving water temperature of said natural gas engine to be in a hot operating regime, stopping and not returning said controlling the leaving water temperature of said natural gas engine to be in a hot operating regime when said count number reaches a target number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210706039.XA CN115031974A (en) | 2022-06-21 | 2022-06-21 | Method and system for testing reliability of natural gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210706039.XA CN115031974A (en) | 2022-06-21 | 2022-06-21 | Method and system for testing reliability of natural gas engine |
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| Publication Number | Publication Date |
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| CN115031974A true CN115031974A (en) | 2022-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210706039.XA Pending CN115031974A (en) | 2022-06-21 | 2022-06-21 | Method and system for testing reliability of natural gas engine |
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| CN (1) | CN115031974A (en) |
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- 2022-06-21 CN CN202210706039.XA patent/CN115031974A/en active Pending
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