CN1147721C - Abnormal combustion detecting method and warning device for air cylinder of gas engine - Google Patents
Abnormal combustion detecting method and warning device for air cylinder of gas engineInfo
- Publication number
- CN1147721C CN1147721C CNB991040775A CN99104077A CN1147721C CN 1147721 C CN1147721 C CN 1147721C CN B991040775 A CNB991040775 A CN B991040775A CN 99104077 A CN99104077 A CN 99104077A CN 1147721 C CN1147721 C CN 1147721C
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- cylinder
- temperature
- engine
- gas outlet
- combustion
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Abstract
The present invention relates to an abnormal combustion phenomenon detection method and an alarm device for gas engine cylinders. The variation of exhaust temperature in exhaust pipes of cylinders is detected, compared and analyzed to determine whether combustion in the cylinders is normal or not; the alarm device comprises a temperature sensor, a compensating wire and a circuit processing device, wherein the temperature sensor measures temperature in the exhaust pipes of the engine, converts the temperature to an electrical signal and processes the electrical signal. After the engine have the phenomena of the abnormal combustion and even the flameout of the cylinders, the alarm device detect the phenomena and gives an alarm; the occurrence of engine deflagration caused by the accumulation of unburned fuel gas in the engine cylinders can be well avoided.
Description
The present invention relates to the control of engine, more specifically refer to a kind of detection method and warning device of cylinder of gas engine malcombustion phenomenon.
Current, because environmental pollution is serious, the toxic emission of motor car engine will more and more be restricted, implemented new Abgasgesetz from 1999 as Beijing, Shanghai and other places, in order to reduce exhaust gas discharging, reduce to pollute, energy savings, each big city, the whole nation is just at the gas blowing engine of car, bus and some special occasions Application and Development low emissions.Conventional way is to utilize the gasoline engine, the diesel engine refitted that use in the existing motor vehicle (ship) to become gas blowing engine, and commonly used have liquefied-pertroleum-gas engine (LPG engine), gas motor, a methane fuelled engine etc.In the retrofit process, general fuel system and evaporator, mixer etc. are all through studying meticulously, design, making, but the others of engine do not have to change substantially, in fact, because the inherent characteristics of gas blowing engine and the influence of various factors in service, often not right because of air-fuel ratio, the reasons such as electric system dead electricity, igniter failure of perhaps lighting a fire cause the malcombustion of a certain cylinder of engine or multi-cylinder or stop working, the after-burning of combustion gas in gas outlet will cause delivery temperature to raise, even burn out gas outlet.Obviously, from security standpoint, gas blowing engine must prevent and avoid this accident to take place.
For this reason, the present invention is directed to the problem that the above-mentioned gas engine is prone to, propose a kind of detection method and warning device of cylinder of gas engine malcombustion phenomenon.
To achieve these goals, the present invention adopts following technical scheme:
Its detection method is to stretch into temperature sensor in each gas outlet of the cylinder of gas engine that is burning, so that the temperature in corresponding each gas outlet is measured; The temperature value of being surveyed is converted to electric signal, and what this electric signal set with one again compares with the corresponding load voltage value of safe combustion temperature value; If behind the ratings that the temperature value of certain cylinder is allowed less than the safe combustion temperature value in the cylinder of gas engine of being surveyed, then send alerting signal.
This detection alarm device mainly comprises temperature sensor, compensating wire, the processing of circuit device of the gas outlet that can stretch into cylinder, electric signal is measured and be converted to temperature sensor to the temperature in the exhaust pipe of engine, and this electric signal inputs to the processing of circuit device through compensating wire and handles.
Because the detection method that measured temperature is compared with the safe combustion temperature value in the present invention's employing each gas outlet with burning cylinder of gas engine is just sent alerting signal after both temperature difference surpass certain value; And adopted the detection alarm device that has constituted cylinder of gas engine malcombustion phenomenon by temperature sensor, compensating wire, processing of circuit device, after the temperature sensor with this device places the gas blowing engine gas outlet, in case engine occur cylinder can not normal combustion in addition flame-out phenomenon after, therefore this detection alarm device will detect and report to the police, and can avoid gathering of combustion gas in the cylinder preferably and causes the generation of the deflagration of engine.
Below in conjunction with drawings and Examples, the present invention is described in further detail:
Fig. 1 is a detection alarm apparatus structure principle schematic of the present invention.
Ultimate principle of the present invention is, when the gas blowing engine operate as normal, the delivery temperature numerical value of each cylinder higher (no matter being full load or sub-load), each inblock cylinder temperature is more even, usually the temperature difference is less than 50-70 ℃, in case but a certain cylinder of engine does not burn, then the delivery temperature of this cylinder will descend rapidly.Based on this principle, we by to a cylinder not the variation of instancy of combustion delivery temperature measure, it the results are shown in following table:
Table: the flame-out influence of a certain LPG cylinder to respective row gas branch pipe delivery temperature
| Operating condition | Test cylinder normal exhaust temperature ℃ | Flame-out final vacuum in the 5 seconds temperature of test cylinder ℃ | Flame-out final vacuum in the 10 seconds temperature of test cylinder ℃ | Flame-out final vacuum in the 15 seconds temperature of test cylinder ℃ |
| Rotating speed 2033r/min power 35.79kW | No.2 cylinder 615 | 575 | 450 | 400 |
| No.3 cylinder 610 | 553 | 472 | 415 | |
| No.6 cylinder 580 | 504 | 394 | 316 | |
| Rotating speed 1526r/min power 12.11kW | No.2 cylinder 605 | 547 | 468 | 415 |
| No.3 cylinder 555 | 521 | 462 | 415 | |
| No.6 cylinder 564 | 492 | 402 | 340 | |
| Rotating speed 1097r/min power 6.76kW | No.2 cylinder 577 | 531 | 463 | 420 |
| No.3 cylinder 539 | 503 | 449 | 405 | |
| No.6 cylinder 516 | 463 | 394 | 338 | |
| Rotating speed 2270r/min power 49.8kW | No.2 cylinder 664 | 570 | 471 | 417 |
| No.3 cylinder 676 | 620 | 510 | 443 | |
| No.6 cylinder 623 | 510 | 381 | 302 |
Annotate: testing machine is 6 cylinder machines
Can draw certain rules in the experimental data from table, in 15 seconds after cylinder combustion gas does not burn, row's temperature of this cylinder descends rapidly, and decline scope is bigger, measure checking through test of many times, the warm fall of row can reach 100 degree in 10 seconds, even more than 200 degree, if the burnout time reaches 15 seconds, then the decline of row's temperature is bigger.Another situation is that the rate of descent of this cylinder delivery temperature is big when high load capacity is flame-out, and the fall off rate of this cylinder delivery temperature is little when underload is flame-out; But, both temperature through 15 seconds or longer time after, finally be tending towards same stable temperature range.
According to above-mentioned experimental result, detection method of the present invention is: stretch into each gas outlet of cylinder of gas engine of burning (when for single cylinder with temperature sensor, indication is exactly gas outlet herein: when for multi-cylinder, gas outlet herein then is an exhaust branch pipe) in, in general be to stretch in each gas outlet of cylinder of gas engine that is burning with thermopair, so that the temperature in corresponding each gas outlet is measured, measured temperature value is converted to electric signal, what this electric signal set with one again compares with the corresponding load voltage value of safe combustion temperature value, if in case the temperature value of certain cylinder is (certain in the cylinder of gas engine of being surveyed, with respect to this temperature value a correspondent voltage value is arranged then, the temperature value of following indication all has a correspondent voltage value) behind the ratings that allowed less than the safe combustion temperature value, then send alerting signal.Temperature in each gas outlet of the cylinder of gas engine that is burning and the safe combustion temperature value that sets following three kinds of comparative approach are relatively arranged, first kind of comparative approach is, the mean value of setting the delivery temperature of each cylinder exhaust pipe when normal combustion is the safe combustion temperature value, the temperature of the gas outlet during with each cylinder combustion is compared with described delivery temperature mean value, if the temperature of a certain gas outlet can assert just that less than the mean value of delivery temperature the pairing cylinder combustion of this gas outlet is undesired; Second kind of comparative approach, the exhaust main of setting cylinder is (when engine is multi-cylinder, the house steward that gas outlet converged of each cylinder) delivery temperature is the safe combustion temperature value, the temperature of the gas outlet during with each cylinder combustion is compared with the delivery temperature of described exhaust main, if the temperature of a certain gas outlet during less than the delivery temperature of exhaust main, can assert that just the pairing cylinder combustion of this gas outlet is undesired; The third comparative approach, the minimum delivery temperature value of setting under the normal combustion state is the safe combustion temperature value, the temperature of the gas outlet during with each cylinder combustion is compared with described minimum delivery temperature value, if when the temperature of a certain gas outlet is lower than minimum delivery temperature value, can assert that just the pairing cylinder combustion of this gas outlet is undesired.To decide on concrete situation with any of above-mentioned three kinds of comparative approach.
See also shown in Figure 1ly, in general it contains cylinder to gas blowing engine, and single cylinder or multi-cylinder are connected to gas outlet on cylinder head 1, and in the gas blowing engine of multi cylinder, each cylinder all is connected to exhaust branch pipe 3, each exhaust branch pipe 3 communicates with exhaust main.Detection alarm device of the present invention mainly comprises and can stretch into the exhaust pipe of engine (when when the single cylinder, indication is exactly gas outlet herein; When being multi-cylinder, gas outlet herein then is an exhaust branch pipe) temperature sensor 4, compensating wire 5, processing of circuit device 6, electric signal is measured and be converted to temperature in 4 pairs of exhaust pipes of engine of temperature sensor, this electric signal inputs to processing of circuit device 6 through compensating wire 5 and handles, this processing of circuit device 6 is general processing of circuit warning device, and its effect mainly is that the electric signal after temperature sensor 4 is measured carries out processing and amplifying and warning.7 on square frame among the figure is a topworks, for example, for sound, light are reported to the police or control section, the occasion that this part inspection is observed and predicted the alarm device use is provided with, when topworks being connected to control cabin as need, then processing of circuit device 6 just output supply with the signal of topworks, report to the police or control by topworks.Because processing of circuit device 6 and topworks all can adopt general known circuit,, just be not described in detail at this.
In the present invention, temperature sensor 4 has adopted thermopair.The shape of said thermopair adopts identical with the shape of gas outlet, can adopt two sections, and one section be that circular arc, one section are vertical shape, and circular arc stretches in the exhaust branch pipe 3 for one section, and one section of vertical shape is at exhaust main 2.The quantity of said thermopair can be provided with according to the cylinder number of cylinder of gas engine, and thermopair has adopted four among the present invention.As for adopting how many roots then will depend on the circumstances, gas blowing engine is a single cylinder, and then the thermopair employing is single, if gas blowing engine is a twin-tub, then thermopair adopts two, and the like, if gas blowing engine is a multi-cylinder, then thermopair adopts many.
Claims (8)
1, a kind of detection method of cylinder of gas engine malcombustion phenomenon is characterized in that: stretch into temperature sensor in each gas outlet of cylinder of gas engine that is burning, so that the temperature in corresponding each gas outlet is measured; The temperature value of being surveyed is converted to electric signal, and what this electric signal set with one again compares with the corresponding load voltage value of safe combustion temperature value; If behind the ratings that the temperature value of certain cylinder is allowed less than the safe combustion temperature value in the cylinder of gas engine of being surveyed, then send alerting signal.
2, the detection method of cylinder of gas engine malcombustion phenomenon as claimed in claim 1, it is characterized in that: the mean value of setting the delivery temperature of each cylinder exhaust pipe when normal combustion is the safe combustion temperature value, the temperature of the gas outlet during with each cylinder combustion is compared with described delivery temperature mean value, if the temperature of a certain gas outlet assert just that less than the mean value of delivery temperature the pairing cylinder combustion of this gas outlet is undesired.
3, the detection method of cylinder of gas engine malcombustion phenomenon as claimed in claim 1, it is characterized in that: the delivery temperature of setting the exhaust main of cylinder is the safe combustion temperature value, the temperature of the gas outlet during with each cylinder combustion is compared with described house steward's delivery temperature, if the temperature of a certain gas outlet during less than the delivery temperature of exhaust main, assert that just the pairing cylinder combustion of this gas outlet is undesired.
4, the detection method of cylinder of gas engine malcombustion phenomenon as claimed in claim 1, it is characterized in that: the minimum delivery temperature value of setting under the normal combustion state is the safe combustion temperature value, the temperature of the gas outlet during with each cylinder combustion is compared with described minimum delivery temperature value, if the temperature of a certain gas outlet during less than minimum delivery temperature value, can assert that just the pairing cylinder combustion of this gas outlet is undesired.
5, a kind of detection alarm device of cylinder of gas engine malcombustion phenomenon, it is characterized in that: this detection alarm device mainly comprises temperature sensor, compensating wire, the processing of circuit device that can stretch into the exhaust pipe of engine, electric signal is measured and be converted to temperature sensor to the temperature in the exhaust pipe of engine, and this electric signal inputs to the processing of circuit device through compensating wire and handles.
6, the detection alarm device of cylinder of gas engine malcombustion phenomenon as claimed in claim 5 is characterized in that: said temperature sensor adopts thermopair.
7, the detection alarm device of cylinder of gas engine malcombustion phenomenon as claimed in claim 6 is characterized in that: the shape of said thermopair adopts identical with the shape of gas outlet.
8, the detection alarm device of cylinder of gas engine malcombustion phenomenon as claimed in claim 6 is characterized in that: the quantity of said thermopair can be provided with single root at the most according to the cylinder number of cylinder of gas engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991040775A CN1147721C (en) | 1999-03-19 | 1999-03-19 | Abnormal combustion detecting method and warning device for air cylinder of gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991040775A CN1147721C (en) | 1999-03-19 | 1999-03-19 | Abnormal combustion detecting method and warning device for air cylinder of gas engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1267823A CN1267823A (en) | 2000-09-27 |
| CN1147721C true CN1147721C (en) | 2004-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB991040775A Expired - Fee Related CN1147721C (en) | 1999-03-19 | 1999-03-19 | Abnormal combustion detecting method and warning device for air cylinder of gas engine |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2841938B1 (en) * | 2002-07-08 | 2004-08-27 | Meillor Sa | ARRANGEMENT OF A SENSOR AND ITS WIRED CONNECTIONS IN A MULTI-LEAF METAL HEAD GASKET |
| JP4492549B2 (en) * | 2006-01-27 | 2010-06-30 | トヨタ自動車株式会社 | Misfire determination device, hybrid vehicle, and misfire determination method |
| CN102052163B (en) * | 2009-10-30 | 2013-01-23 | 江苏林海动力机械集团公司 | Single cylinder flame-out protection device for double-cylinder all-terrain vehicle |
| US9103895B2 (en) | 2010-11-02 | 2015-08-11 | Schneider Electric USA, Inc. | Automated emergency power supply test using engine exhaust temperature |
| CN103282787B (en) * | 2010-11-02 | 2016-06-22 | 施耐德电气美国股份有限公司 | Automatic emergency is for electrical testing |
| CN105067275A (en) * | 2015-07-24 | 2015-11-18 | 哈尔滨工业大学 | Gas turbine combustion system online monitoring and diagnosis method based on exhaust temperature deviation index |
| CN112033687A (en) * | 2020-09-07 | 2020-12-04 | 潍柴动力股份有限公司 | Cylinder-failure testing method and device, controller and engine |
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1999
- 1999-03-19 CN CNB991040775A patent/CN1147721C/en not_active Expired - Fee Related
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| CN1267823A (en) | 2000-09-27 |
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