CN102620938B - Backfire detecting device and backfire testing method for reciprocating piston engine - Google Patents
Backfire detecting device and backfire testing method for reciprocating piston engine Download PDFInfo
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- CN102620938B CN102620938B CN201210101508.1A CN201210101508A CN102620938B CN 102620938 B CN102620938 B CN 102620938B CN 201210101508 A CN201210101508 A CN 201210101508A CN 102620938 B CN102620938 B CN 102620938B
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Abstract
The invention relates to a backfire detecting device and a backfire testing method for a reciprocating piston engine, which belong to the technical field of testing of internal combustion engines. The backfire detecting device comprises a sensor, a backfire signal detector, an analog-to-digital conversion module and a data storage and display module. The sensor is mounted at an air inlet valve of an air inlet pipe of a tested engine and connected with the backfire signal detector, signals are connected with the analog-to-digital conversion module after being processed by the backfire signal detector, and output of the analog-to-digital conversion module is connected with the data storage and display module. The invention further discloses a backfire tide judging and testing method of the reciprocating piston engine and a method for testing backfire induced artificially, which can be used for backfire testing required in the airworthiness approval standards of an aviation reciprocating piston engine. By judging and eliminating backfire faults of the reciprocating piston engine through backfire testing on the characteristic conditions, reliability of running of the engine is improved and important application value is achieved.
Description
Technical field
The present invention relates to piston engine tempering pick-up unit and test method, belong to IC Engine Test Technology field.
Background technology
Piston type gasoline engine relies on gasoline, air Mixture to burn work done in cylinder combustion and produces power.When combination gas in cylinder is crossed when rare, it is slack-off that cylinder combustion is burnt speed, when exhaust process nearly finishes, combustion process is not over yet, in inlet valve and exhaust valve Die Kai district, still unclosed combustion flame is likely scurried into draft tube from inlet valve, lights combination gas, cause draft tube tempering, when serious with the abnormal noise of " bang bang ".The reason such as excessively slow, the each cylinder firing order of the engine entanglement duration of ignition in addition,, valve-closing are not tight all can cause the tempering of piston engine.The tempering meeting of piston engine increases the intake resistance of engine, and charging efficiency is reduced, and causes engine start difficulty, power to decline, running is unstable, oil consumption is risen, serious can pilot fuel, cause engine ignition.The accurate detection of tempering phenomenon has great importance for diagnosis and eliminating piston engine tempering fault.Especially, aviation piston type engine will be obtained seaworthiness type certificate could assemble corresponding civil aircraft, and backfire test is an important content of the test in aviation piston type engine seaworthiness Valuation Standard.Verify by backfire test whether aviation piston type engine exists tempering trend and the impact of tempering on engine reliability.
When aeromotor generation tempering phenomenon, its combustion flame returns to draft tube from firing chamber, and the instantaneous rising of engine air inlet tube pressure and temperature, produces luminous, fever phenomenon, sometimes with sound, can be by the detection of these phenomenons being judged to whether engine tempering has occurred.Temperature sensor response life period lags behind, and is difficult to detect in tempering moment the variation of temperature, adopts sound transducer to be easily subject to again the interference of engine noise.
Through domestic and foreign literature retrieval, not yet find to deliver about the open source literature of piston engine tempering pick-up unit and Test Research.
Summary of the invention
The object of the invention is the test problems for solving piston engine tempering phenomenon, a kind of piston engine tempering pick-up unit and test method are provided, pick-up unit of the present invention can be applicable to the detection to piston engine tempering phenomenon, its detection method be applicable to that engine flashback trend is determined and artificial induction's tempering mode under the backfire test of engine.
A kind of piston engine tempering pick-up unit, comprises sensor, tempering signal detecting and measuring apparatus, modulus (A/D) modular converter and data storage and display module.Installation of sensors is in the inlet valve place of tested engine air inlet tube, and sensor is connected with tempering signal detecting and measuring apparatus; Tempered signal detecting and measuring apparatus signal after treatment is connected to A/D modular converter, and the output of A/D modular converter is connected with data storage and display module.
Described sensor adopts dynamic pressure transducer or photoelectric sensor, variation or the luminescence phenomenon of suction press while being used for measuring tempering generation.Installation of sensors is apart from engine intake valve a distance, meanwhile, and with horizontal direction inclination certain angle, to make sensor can detect more delicately the tempering phenomenon that engine intake valve place occurs.
Described tempering signal detecting and measuring apparatus comprises signal filtering unit, signal threshold value setup unit, comparer, signal amplification unit, LED display module and digital counting device module.Wherein, the input connecting sensor of signal filtering unit, output is connected to respectively comparer and analog-to-digital conversion module; The output of signal threshold value setup unit is connected to comparer, and comparer exports signal amplification unit to; The output of signal amplification unit is connected to respectively LED and shows and digital counting device.Tempering signal detecting and measuring apparatus carries out after real-time amplification filtering sensor signal, compares with the threshold signal of setting, and determines whether to have occurred tempering; As there is tempering, the LED lamp flicker of drive installation on tempering signal detecting and measuring apparatus panel of LED display module, meanwhile, digital counting device module records times of tempering.Tempering signal detecting and measuring apparatus of the present invention comprises multiple passages, when can realizing the each cylinder tempering of piston engine signal, detects.
The simulating signal of signal filtering unit output is converted to digital signal by described A/D modular converter.
Described data storage and display module carry out real time record, storage demonstration to the temper designations of A/D modular converter output, so that test findings is analyzed after test.
A kind of piston engine backfire test method, specifically comprises the steps:
The concrete grammar of tempering testing experiment is:
Adjust advance angle of engine ignition to normal operating conditions-1 ° ± 0.5 °, mixing ratio bar, in rich oil position, regulates throttle lever to make engine to maximum continuous state, slowly adjusts mixing ratio bar to oil-poor direction, makes engine produce tempering; If still can not make engine generation tempering, continue to adjust ignition advance angle-1 ° ± 0.5 ° until engine generation tempering.
Beneficial effect
The present invention discloses a kind of piston engine tempering trend and judge tempering test method under test method and artificial induction's tempering mode, can be used for the backfire test requiring in aviation piston type engine trial voyage or flight Valuation Standard.The present invention adopt repeatedly with various working under test, for diagnosis with get rid of piston engine tempering fault and there is significant application value to improve engine reliability of operation.
Pick-up unit of the present invention and test method judgement and the backfire test method to tempering trend has important directive significance and reference value.
Accompanying drawing explanation
Fig. 1 is the photoelectric sensor detecting for tempering in embodiment;
Fig. 2 (a) is the 6 passage tempering signal detecting and measuring apparatus for sensor signal detection in embodiment; Fig. 2 (b) is tempering signal detecting and measuring apparatus rear panel;
Fig. 3 is tempering signal detecting and measuring apparatus testing circuit theory diagram of the present invention;
Fig. 4 is the schematic diagram that backfire test hardware installation of the present invention is implemented;
Fig. 5 is photoelectric sensor installation diagram in embodiment;
Fig. 6 is the simple process figure of backfire test method in embodiment.
Label declaration:
1-photoelectric sensor, 2-photo-sensitive cell, 3-stube cable, 4-reset key, 5-LED display lamp, 6-digital counting device, 7-tempering signal detecting and measuring apparatus, 8-power switch, 9-attaching plug, 10-signal output terminal, 11-signal input terminal, 12-6 cylinder piston engine, 13-engine air inlet tube, 14-A/D modular converter, 15-computing machine, 16-engine intake valve.
Embodiment
Objects and advantages of the present invention illustrate embodiments of the present invention below in conjunction with accompanying drawing and an aviation piston type engine backfire test in order better to illustrate.
1. tempering input principle
The piston engine tempering pick-up unit of the present embodiment, comprises sensor, tempering signal detecting and measuring apparatus 2, A/D modular converter 14 and data storage and display module; Wherein sensor adopts photoelectric sensor 1, and data storage and display module adopt computing machine 15 to realize in conjunction with acquisition software wherein; Tempering signal detecting and measuring apparatus 2 is 6 passage tempering signal detecting and measuring apparatus, and as shown in Figure 2, front panel is equipped with reset key 4, LED display lamp 5, and digital counting device 6, rear panel is equipped with power switch 8, attaching plug 9, signal output terminal 10, signal input terminal 11.
The inside testing circuit of tempering signal detecting and measuring apparatus 7 as shown in Figure 3, comprises signal filtering unit, signal threshold value setup unit, comparer, signal amplification unit, LED display module and digital counting device module.For reducing the impact of external interference, the voltage signal that photoelectric sensor 1 is exported is first by a low-pass signal filter unit.Under engine work state, due to the existence of external interference, photoelectric sensor 1 signal output voltage has fuctuation within a narrow range, and in the time that tempering phenomenon occurs, photoelectric sensor 1 signal output voltage can produce one compared with strong voltage pulse signal, and the amplitude of signal is relevant with the power of tempering.In tempering signal detecting and measuring apparatus 7, Threshold unit is exported a constant voltage by adjustable potentiometer and is compared with the signal after signal filtering unit filtering.When engine tempering-free phenomenon, after filtering, signal is less than signal threshold value unit setting value, and comparer output voltage is 0 volt; When engine has tempering phenomenon, after filtering, signal is greater than threshold value assigning unit assigns value, comparer output voltage be on the occasion of, through signal amplification unit amplify after produce a 5V limit value voltage signal.Signal driver after amplification is arranged on LED display lamp 5 and the digital counting device 6 on tempering signal detecting and measuring apparatus 7 front panels, and in the time that tempering phenomenon occurs, LED display lamp 5 glimmers, and meanwhile, digital counting device 6 records the number of times that tempering occurs.Signal after signal filtering unit filtering outputs to analog-to-digital conversion module 14 simultaneously, be shown in real time on computer display and store in hard disk by the data acquisition software being arranged on computing machine 15, after the filtering of these preservations, can be used for statistics to engine flashback number of times and the analysis of engine flashback power without the tempering signal relatively amplifying.6 passage tempering signal detecting and measuring apparatus 7 of application present principles can be realized detecting when the each cylinder tempering of 6 cylinder piston engine 12 signal in Fig. 4.
2. the installation of backfire test detection hardware system
The installation site of photoelectric sensor 1 on engine air inlet tube 13 as shown in Figure 5, in the present embodiment, photoelectric sensor 1 is installed on apart from approximately 50～80mm place of engine intake valve 16, simultaneously, photoelectric sensor 1 and horizontal direction inclination certain angle, approximately 15～25 ° of angles, to make photo-sensitive cell 2 can detect the tempering phenomenon that engine intake valve 16 places occur.
3. piston engine backfire test
Connect after tempering pick-up unit hardware by Fig. 4, can on engine testsand, carry out the tempering testing experiment of piston engine.Before backfire test, should guarantee that engine behavior is normal, its power, moment of torsion, fuel consumption meet the regulation of its technical data.Press the backfire test method flow shown in Fig. 6, carry out tempering trend testing experiment.
The test of tempering trend can be carried out as follows:
The cold start operating mode of starting, engine normal starting 5 times, detects engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal;
Regulate engine to takeoff condition to turn round, regulate mixing ratio bar, reduce the critical point that fuel delivery to engine can not steady operation; Keep the invariant position of mixing ratio bar, adjust throttle lever to slow train rotating speed, engine carries out acceleration and deceleration each 5 times, and the acceleration time is 2 seconds, detects engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal;
Regulate engine to turn round to maximum continuous state, regulate mixing ratio bar, reduce the critical point that fuel delivery to engine can not steady operation, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal;
Regulate engine to 0.75 maximum continuous state to turn round, regulate mixing ratio bar, reduce the critical point that fuel delivery to engine can not steady operation, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal;
Regulate engine to 0.6 maximum continuous state to turn round, regulate mixing ratio bar, reduce the critical point that fuel delivery to engine can not steady operation, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and record tempering detection signal;
Under heat engine state, engine normal starting 5 times, detects engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal;
Regulate engine to the engine inspection duty of turning round, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal.
In above test, if engine is inclined to without any tempering, carry out tempering testing experiment, artificially produce more than 3 times tempering; If determine, engine has tempering tendency, carries out tempering testing experiment, artificially produces 20 above tempering.
The concrete grammar of tempering testing experiment is:
Adjust advance angle of engine ignition to normal operating conditions-1 ° ± 0.5 °, mixing ratio bar is in rich oil position, regulate throttle lever to make engine to maximum continuous state, slowly adjust mixing ratio bar to oil-poor direction, make engine produce more than 3 times or 20 times tempering; If still can not make engine generation tempering, continue to adjust ignition advance angle-1 ° ± 0.5 ° until engine generation tempering.In process of the test, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and by computer recording tempering detection signal.
More than for adopting tempering signal supervisory instrument disclosed herein and test method, a kind of embodiment that adopts photoelectric sensor to carry out piston engine tempering test, its pick-up unit and test method are applicable to the tempering testing experiment of the middle requirement of Civil Aviation Engine seaworthiness Valuation Standard.
While adopting dynamic pressure transducer to carry out engine flashback testing experiment, in tempering signal detecting and measuring apparatus, signal filtering mode difference, its embodiment carries out tempering with use photoelectric sensor and tests identical.
Although this paper describes a kind of embodiment of content of the present invention, but can envisioning some, those skilled in the art do not change the modifications and variations of the embodiment of substantive summary of the invention, as the change of tempering signal detecting and measuring apparatus port number, the change of test sequence in backfire test method, the change that in backfire test method, operating mode is selected etc.Therefore, should be understood that, claims are intended to be encompassed in these identical with essentiality content of the present invention in essence modifications and variations.
Claims (5)
1. a piston engine tempering pick-up unit, is characterized in that: comprise sensor, tempering signal detecting and measuring apparatus, analog-to-digital conversion module and data storage and display module; Installation of sensors is in the inlet valve place of tested engine air inlet tube, and sensor is connected with tempering signal detecting and measuring apparatus; Tempered signal detecting and measuring apparatus signal after treatment is connected to analog-to-digital conversion module, and the output of analog-to-digital conversion module is connected with data storage and display module;
Described sensor adopts dynamic pressure transducer or photoelectric sensor; Variation or the luminescence phenomenon of suction press while being used for measuring tempering generation;
Described tempering signal detecting and measuring apparatus comprises multiple passages, when realizing the each cylinder tempering of piston engine signal, detects; Specifically comprise signal filtering unit, signal threshold value setup unit, comparer, signal amplification unit, LED display module and digital counting device module; Wherein, the input connecting sensor of signal filtering unit, output is connected to respectively comparer and analog-to-digital conversion module; The output of signal threshold value setup unit is connected to comparer, and comparer exports signal amplification unit to; The output of signal amplification unit is connected to respectively LED display module and digital counting device module; Tempering signal detecting and measuring apparatus carries out after real-time amplification filtering sensor signal, compares with the threshold signal of setting, and determines whether to have occurred tempering; As there is tempering, the LED lamp flicker of drive installation on tempering signal detecting and measuring apparatus panel of LED display module, meanwhile, digital counting device module records times of tempering;
The simulating signal of signal filtering unit output is converted to digital signal by described analog-to-digital conversion module;
Described data storage and display module carry out real time record, storage demonstration to the temper designations of analog-to-digital conversion module output.
2. a kind of piston engine tempering pick-up unit according to claim 1, is characterized in that: the installation site of described sensor is apart from engine intake valve certain distance, while and horizontal direction inclination certain angle.
3. a kind of piston engine tempering pick-up unit according to claim 1, is characterized in that: the photo-sensitive cell of described photoelectric sensor adopts phototriode or photodiode.
4. a piston engine backfire test method, is characterized in that: specifically comprise the steps:
Step 1, the cold start operating mode of starting, engine normal starting repeatedly, detects engine flashback phenomenon by tempering signal detecting and measuring apparatus, and records tempering detection signal;
Step 2, regulates engine to takeoff condition to turn round, and regulates mixing ratio bar, reduces the critical point that fuel delivery to engine can not steady operation; Keep the invariant position of mixing ratio bar, adjust throttle lever to slow train rotating speed, carry out repeatedly acceleration and deceleration according to engine performance, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and record tempering detection signal;
Step 3, regulates engine to turn round to maximum continuous state, regulates mixing ratio bar, reduces the critical point that fuel delivery to engine can not steady operation, detects engine flashback phenomenon, and record tempering detection signal by tempering signal detecting and measuring apparatus;
Step 4, regulates engine to certain several feature operating mode to turn round, and regulates mixing ratio bar, reduces the critical point that fuel delivery to engine can not steady operation, detects engine flashback phenomenon, and record tempering detection signal by tempering signal detecting and measuring apparatus;
Step 5, under heat engine state, engine normal starting repeatedly, detects engine flashback phenomenon by tempering signal detecting and measuring apparatus, and records tempering detection signal;
Step 6, regulates engine to the engine inspection duty of turning round, and detects engine flashback phenomenon, and record tempering detection signal by tempering signal detecting and measuring apparatus;
Step 7, the tempering detection signal result that step 1-step 6 is obtained is analyzed, and judges whether engine exists tempering tendency, and carries out tempering testing experiment; If engine is inclined to without any tempering, artificial induction produces more than 3 times tempering; If judge, engine has tempering tendency, and artificial induction produces 20 above tempering; In process of the test, detect engine flashback phenomenon by tempering signal detecting and measuring apparatus, and record tempering detection signal;
The concrete grammar of tempering testing experiment is:
Adjust advance angle of engine ignition to normal operating conditions-1 ° ± 0.5 °, mixing ratio bar, in rich oil position, regulates throttle lever to make engine to maximum continuous state, slowly adjusts mixing ratio bar to oil-poor direction, makes engine produce tempering; If still can not make engine generation tempering, continue to adjust ignition advance angle-1 ° ± 0.5 ° until engine generation tempering;
Step 8, the tempering detection signal that step 7 is recorded is analyzed, and binding engine performance test and disassemble check the reliability of engine is assessed, obtain the impact of tempering on engine.
5. a kind of piston engine backfire test method according to claim 4, is characterized in that: described step 1 to the test sequence of step 6 changes according to actual conditions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210101508.1A CN102620938B (en) | 2012-04-09 | 2012-04-09 | Backfire detecting device and backfire testing method for reciprocating piston engine |
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| CN201210101508.1A CN102620938B (en) | 2012-04-09 | 2012-04-09 | Backfire detecting device and backfire testing method for reciprocating piston engine |
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| CN107884196B (en) * | 2017-12-15 | 2024-01-12 | 潍柴西港新能源动力有限公司 | Tempering fault simulation control system and control method for natural gas engine |
| CN109141901A (en) * | 2018-08-10 | 2019-01-04 | 淄博淄柴新能源有限公司 | Monitoring system is blown out in gas engine tempering based on Digital Image Processing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000274613A (en) * | 1999-03-18 | 2000-10-03 | Osaka Gas Co Ltd | Burner and its operation method |
| CN101782234A (en) * | 2009-01-21 | 2010-07-21 | 通用电气公司 | Systems and methods of monitoring acoustic pressure to detect a flame condition in a gas turbine |
| CN101949540A (en) * | 2009-07-08 | 2011-01-19 | 通用电气公司 | ACTIVE CONTROL to flame stabilization and tempering in the turbine burner fuel nozzle |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000274613A (en) * | 1999-03-18 | 2000-10-03 | Osaka Gas Co Ltd | Burner and its operation method |
| CN101782234A (en) * | 2009-01-21 | 2010-07-21 | 通用电气公司 | Systems and methods of monitoring acoustic pressure to detect a flame condition in a gas turbine |
| CN101949540A (en) * | 2009-07-08 | 2011-01-19 | 通用电气公司 | ACTIVE CONTROL to flame stabilization and tempering in the turbine burner fuel nozzle |
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