CN105444947B - A kind of gas engine pinking test system and method - Google Patents
A kind of gas engine pinking test system and method Download PDFInfo
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- CN105444947B CN105444947B CN201510961406.0A CN201510961406A CN105444947B CN 105444947 B CN105444947 B CN 105444947B CN 201510961406 A CN201510961406 A CN 201510961406A CN 105444947 B CN105444947 B CN 105444947B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
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Abstract
The invention discloses a kind of gas engine pinking test system and method,Including in-cylinder pressure collecting unit,Engine body vibration acceleration collecting unit,Engine noise signal gathering unit and signal processing analysis system,Wherein,The cylinder pressure signal of the in-cylinder pressure collecting unit collection gas engine difference operating mode,Engine body vibration acceleration collecting unit gathers the body vibration acceleration signal of gas engine,Engine noise signal gathering unit gathers the noise signal of gas engine,Signal processing analysis system is according to pressure,Vibration acceleration and noise signal,The numerical value of the detonating combustion pressure peak of indicator card in extracting cylinder,Vibration acceleration size,Engine combustion spectral characteristics of noise,Determine the correlation of combustion noise spectral characteristic and noise intensity,With pinking peak combustion pressure in cylinder and the correlation of body vibration acceleration value size.
Description
Technical field
The present invention relates to a kind of gas engine pinking test system and method.
Background technology
In recent years, energy crisis and large area outburst haze weather to the health status of Chinese residents and some area
Production causes significant impact, promotes China to be adjusted the unreasonable factor of energy resource structure.Wherein of vehicular emission
Grain is one of main source of city haze.And more than 90% composition is methane in natural gas, due to being free of C-C in methane
Key, the growing amount of combustion process soot is few, therefore, city bus or truck done using natural gas can realize after fuel it is clear
Clean smokeless combustion, to alleviating Chinese environmental pollution and realizing that energy diversification is significant.
But natural gas engine is compared with diesel engine due to using premixed combustion technology, and detonating combustion is pre-
One big characteristic of mixed burning, therefore detonating combustion problem easily occurs in big load operation for natural gas engine, causes to discharge
Deteriorate, engine reliability reduces.Because different regions are different particularly in natural gas engine commercially actual motion
The composition of time natural gas is different, makes the anti-knock properties of different regions natural gas different, makes this problem particularly evident.In laboratory
Or market typically judges knock intensity, optimization demarcation by measuring the vibration acceleration of cylinder pressure signal and engine body
Engine, but the threshold value of the judgement of different engine knock intensities is different, mainly according to the empirically determined of engineer, makes engineering
The problem of being difficult to accurately judge knock intensity in practical operation be present in technical staff.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of gas engine pinking test system and method, the present invention
Based on the noise spectrum and noise intensity that are gathered by engine noise analyzer, carry out cylinder in pinking peak combustion pressure and
The knock intensity of body vibration acceleration value judges.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of gas engine pinking test system, including in-cylinder pressure collecting unit, engine body vibration acceleration
Collecting unit, engine noise signal gathering unit and signal processing analysis system, wherein, the in-cylinder pressure collecting unit is adopted
Collect the cylinder pressure signal of gas Different Work Condition of Engine, engine body vibration acceleration collecting unit collection gas engine
Body vibration acceleration signal, engine noise signal gathering unit gather gas engine noise signal, signal transacting
Analysis system according to pressure, vibration acceleration and noise signal, the numerical value of the detonating combustion pressure peak of indicator card in extracting cylinder,
Vibration acceleration size, engine combustion spectral characteristics of noise, the correlation of combustion noise spectral characteristic and noise intensity is determined,
With pinking peak combustion pressure in cylinder and the correlation of body vibration acceleration value size.
The in-cylinder pressure collecting unit, including in-cylinder pressure sensor, corner marking instrument and Combustion tester, wherein the cylinder
Pressure sensor is arranged on gas engine, is gathered the pressure signal in cylinder, is transmitted to Combustion tester, described
Corner marking instrument gathers footmark signal, and the pressure signal in cylinder is noted down according to the pulse of footmark.
The engine noise signal gathering unit, including vibration and noise test instrument, sound intensity probe, the sound intensity probe inspection
Engine noise is surveyed, and is transferred to vibration and noise test instrument.
The engine body vibration acceleration collecting unit, including acceleration transducer and speed probe, it is described to add
Velocity sensor gathers engine body vibration acceleration, and is transferred to vibration and noise test instrument, the speed probe test
The rotating speed of engine, vibration and noise test instrument and speed probe are all connected with signal processing analysis system.
The system also includes working condition adjusting mechanism, and the working condition adjusting mechanism includes dynamometer machine, electronic throttle, started
Electrical Control system and natural gas injection module, the engine electric-controlled system control natural gas injection module change natural gas injection
The natural gas injection amount of valve, realizes the adjustment of different operating mode concentration of natural gas, and engine electric-controlled system is controlled by ignition module
The adjustment of advance angle of engine ignition, engine electric-controlled system are real by the change of dynamometer machine load and the adjustment of electronic throttle
The change of existing engine operating condition point.
A kind of method of work based on said system, comprises the following steps：
(1) engine stabilizer is operated in a certain operating point, cylinder pressure signal, the engine of this operating point of synchronous acquisition
The noise signal of body vibration acceleration and engine；
(2) ignition advance angle or mixture strength of engine are progressively adjusted, is gathered in a series of cylinders of this operating point
The noise signal data of pressure signal, engine body vibration acceleration and engine；
(3) next operating point, repeat step (1)-(2) are determined；
(4) peak value for extracting each circulation in-cylinder pressure detonating combustion pressure is filtered to cylinder pressure signal, and is united
The size and distribution proportion of peak value are counted, while to collecting the size of each working cycles body vibration acceleration of engine and dividing
Cloth ratio is counted, and analyzes the spectral characteristic and noise intensity of engine noise signal.
In the step (4), each operating mode combustion noise spectral characteristic and noise intensity and pinking combustion pressure in cylinder are established
The corresponding relation of peak value and body vibration acceleration value size, determine that different detonating combustion pressure values and body vibration accelerate
The corresponding relation of numerical values recited and knock intensity is spent, the standard of pinking judgement is established with this.
In methods described, in engine testing laboratory bench test or vehicle road test with detonating combustion pressure value or
Foundation of the body vibration acceleration value as independent judgment pinking.
Beneficial effects of the present invention are：
(1) based on the present invention is gathered by engine noise analyzer noise spectrum and noise intensity, establish in cylinder
The knock intensity of detonating combustion pressure peak and body vibration acceleration value judges specification.
(2) the engine noise evaluation method that the present invention uses, different technologies personnel are made to laboratory or operation vehicle
Avoided during pinking evaluation by difference caused by error caused by personal sense of hearing interpretation and different personnel's hearing gaps.
Brief description of the drawings
Fig. 1 is the gas engine pinking test system operating diagram of the present invention；
Fig. 2 is the logical flow chart of the present invention；
Wherein, 101 gas engine, 102 speed probes, 103 corner marking instruments, 104 data acquisition processing systems, 105 combustions
Burning analyzer, 106 vibration and noise test instrument, 107 engine electric-controlled systems, 108 sound intensity probes, 109 acceleration transducers, 110
In-cylinder pressure sensor, 111 ignition modules, 112 natural gas injection modules, 113 gas injectors, 114 electronic throttles,
115 dynamometer machines.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, gas machine pinking test system includes：In-cylinder pressure harvester, engine body vibration accelerate
Spend harvester, engine noise signal pickup assembly, and signal processing analysis system.Function is that synchronous acquisition gas machine starts
Machine shows in extracting cylinder in the cylinder pressure signal, engine body vibration acceleration signal, engine noise signal of different operating modes
Numerical value, vibration acceleration size, the engine combustion spectral characteristics of noise of the detonating combustion pressure peak of work(figure, establish burning and make an uproar
Audio frequency spectral property and noise intensity and pinking peak combustion pressure in cylinder and the correlation of body vibration acceleration value size, with
Combustion noise spectral characteristic and noise intensity are used as determination in a manner of detonating combustion pressure peak or body vibration acceleration magnitude
Mode evaluates the standard of knock intensity threshold value.After the threshold value of knock intensity determines, it can individually analyze and start in follow-up experiment
Machine indicator card detonating combustion pressure or the size of engine body vibration acceleration be accurate and aspect judges gas engine
Pinking.
Start engine first, adjust engine rotating speed and moment of torsion in a certain fixed operating point, this operating mode of synchronous acquisition
The noise signal of cylinder pressure signal, engine body vibration acceleration and the engine put, then adjusts the igniting of engine
Advance angle or mixture strength, such as ignition advance angle adjust from small to large, mixture strength adjustment from dilute to dense, gather this
The volume of data of operating point, it is then determined that next operating point, duplicate data gatherer process, until completing operating mode needed for experiment
The collection of point.Then each circulation in-cylinder pressure pinking combustion of extraction is filtered to cylinder pressure signal using data analysis system
The peak value of pressure is burnt, and counts the size and distribution proportion of peak value, while is shaken to collecting each working cycles body of engine
The size and distribution proportion of dynamic acceleration are counted, and analyze the spectral characteristic and noise intensity of engine noise signal, because
The spectral characteristic different from pinking does not occur occurs in the phase after combustion after generation pinking, and the more strong this noise of pinking is strong
Degree is bigger, and engineers and technicians can be with more visible judgement knock intensity from the spectral characteristic and noise intensity of combustion noise.
Establish each operating mode combustion noise spectral characteristic and noise intensity and accelerate the number of degrees with pinking peak combustion pressure in cylinder and body vibration
It is worth the corresponding relation of size, just determines that different detonating combustion pressure values and body vibration acceleration value size and pinking are strong
The corresponding relation of degree, thus establish the specification of pinking judgement.Subsequent engine laboratory bench is tested or the road test of vehicle road
The foundation of independent judgment pinking can be used as in testing by the use of detonating combustion pressure value or body vibration acceleration value.
Embodiment one：
As shown in figure 1, the gas engine pinking test system includes gas engine 101, speed probe 102, angle
Mark instrument 103, data acquisition processing system 104, Combustion tester 105, vibration and noise test instrument 106, engine electric-controlled system
107, sound intensity probe 108, acceleration transducer 109, in-cylinder pressure sensor 110, ignition module 111, natural gas injection module
112, gas injector 113, electronic throttle 114, dynamometer machine 115.
As shown in figure 1, according to the embodiment of the present invention, gas machine pinking test system includes：In-cylinder pressure collection dress
Put, engine body vibration acceleration harvester, engine noise signal pickup assembly, and signal processing analysis system.
The course of work of the system is to realize hair by the change of the load of dynamometer machine 115 and the adjustment of electronic throttle 114
The change of motivation operating point.Engine electric-controlled system 107 controls natural gas injection module 112 to change gas injector 113 days
Right gas jet amount, realizes the adjustment of different operating mode concentration of natural gas, engine electric-controlled system 107 is controlled by ignition module 111
The adjustment of advance angle of engine ignition.Engine is adjusted after the operation of a certain stable conditions, is gathered using Combustion tester 105 logical
The pressure signal crossed in the cylinder of the collection of in-cylinder pressure sensor 110, it is synchronous to gather footmark signal using corner marking instrument 103, according to
Pressure signal in the pulse record cylinder of footmark.Visited using vibration and noise test instrument 106 by acceleration transducer 109 and the sound intensity
First 108 synchronous acquisition engine body vibration acceleration and engine noise.Data acquisition process is utilized after the completion of signal acquisition
System 104 carries out Treatment Analysis to the signal gathered, establishes combustion noise spectral characteristic and noise intensity and is fired with pinking in cylinder
The correlation of pressure peak and body vibration acceleration value size is burnt, using combustion noise spectral characteristic and noise intensity as really
Determine in a manner of detonating combustion pressure peak or body vibration acceleration magnitude mode evaluates the standard of knock intensity threshold value.
The invention provides the method flow that knock intensity interpretational criteria is formulated using the device.Come below with reference to Fig. 2
It is described in detail.
In step S201, engine is started first, inspection apparatus, determines each acquisition instrument normal work.
In step S202, adjust engine rotating speed and moment of torsion in a certain fixed operating point, and make engine in this work
Condition point stable operation more than 5 minutes.
In step S203, cylinder pressure signal, engine body vibration acceleration and the hair of this operating point of synchronous acquisition
The noise signal of motivation.
In step S204, the ignition advance angle or mixture strength of engine, such as ignition advance angle are then adjusted from small
Adjusted to big, mixture strength adjustment from dilute to dense, gather a series of cylinder pressure signals, the engine body of this operating point
The noise signal data of vibration acceleration and engine.
In step S205, next operating point, repeat step S202-S304 data acquisitions, until completing to try are determined
The collection of operating point needed for testing.
In step S206, each circulation in-cylinder pressure of extraction is filtered to cylinder pressure signal using data analysis system
The peak value of detonating combustion pressure, and the size and distribution proportion of peak value are counted, while to collecting each working cycles of engine
The size and distribution proportion of body vibration acceleration are counted, and spectral characteristic and the noise for analyzing engine noise signal are strong
Degree.
In step S207, engineers and technicians determine sentencing for knock intensity using combustion noise spectral characteristic and noise intensity
Disconnected specification.And establish each operating mode combustion noise spectral characteristic and noise intensity and pinking peak combustion pressure and body vibration in cylinder
The corresponding relation of acceleration value size, just determine different detonating combustion pressure value and body vibration acceleration value sizes
With the corresponding relation of knock intensity, the specification that pinking judges thus is established.
In step S208, detonating combustion number pressure can be used in engine testing laboratory bench test or vehicle road test
The foundation of value or body vibration acceleration value as independent judgment pinking.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (7)
1. a kind of gas engine pinking test system, it is characterized in that：Vibrated including in-cylinder pressure collecting unit, engine body
Acceleration collecting unit, engine noise signal gathering unit and signal processing analysis system, wherein, the in-cylinder pressure collection
Unit gathers the cylinder pressure signal of gas engine difference operating mode, engine body vibration acceleration collecting unit collection gas
The body vibration acceleration signal of engine, engine noise signal gathering unit gather the noise signal of gas engine, letter
Number Treatment Analysis system is according to pressure, vibration acceleration and noise signal, the detonating combustion pressure peak of indicator card in extracting cylinder
Numerical value, vibration acceleration size, engine combustion spectral characteristics of noise, determine combustion noise spectral characteristic and noise intensity
The correlation of pinking peak combustion pressure and body vibration acceleration value size in correlation, and cylinder；
Also include working condition adjusting mechanism, the working condition adjusting mechanism include dynamometer machine, electronic throttle, engine electric-controlled system and
Natural gas injection module, the engine electric-controlled system control natural gas injection module change the gas spraying of gas injector
The amount of penetrating, realizes the adjustment of different operating mode concentration of natural gas, and engine electric-controlled system controls engine ignition to carry by ignition module
The adjustment of anterior angle, engine electric-controlled system realize engine operating condition by the change of dynamometer machine load and the adjustment of electronic throttle
The change of point.
2. a kind of gas engine pinking test system as claimed in claim 1, it is characterized in that：The in-cylinder pressure collection is single
Member, including in-cylinder pressure sensor, corner marking instrument and Combustion tester, start wherein the in-cylinder pressure sensor is arranged at gas
On machine, the pressure signal in cylinder is gathered, is transmitted to Combustion tester, the corner marking instrument gathers footmark signal, according to angle
Pressure signal in target pulse record cylinder.
3. a kind of gas engine pinking test system as claimed in claim 1, it is characterized in that：The engine noise signal
Collecting unit, including vibration and noise test instrument, sound intensity probe, the sound intensity probe detects engine noise, and is transferred to vibration
Noise-measuring instrument.
4. a kind of gas engine pinking test system as claimed in claim 1, it is characterized in that：The engine body vibration
Acceleration collecting unit, including acceleration transducer and speed probe, the acceleration transducer collection engine body shake
Dynamic acceleration, and vibration and noise test instrument is transferred to, the rotating speed of the speed probe test engine, vibration and noise test instrument
Signal processing analysis system is all connected with speed probe.
5. a kind of method of work of the system based on as any one of claim 1-4, it is characterized in that：Including following step
Suddenly：
(1) engine stabilizer is operated in a certain operating point, cylinder pressure signal, the engine body of this operating point of synchronous acquisition
The noise signal of vibration acceleration and engine；
(2) ignition advance angle or mixture strength of engine are progressively adjusted, gathers a series of in-cylinder pressures of this operating point
The noise signal data of signal, engine body vibration acceleration and engine；
(3) next operating point, repeat step (1)-(2) are determined；
(4) peak value for extracting each circulation in-cylinder pressure detonating combustion pressure is filtered to cylinder pressure signal, and counts peak
The size and distribution proportion of value, while to collecting the size and distribution ratio of each working cycles body vibration acceleration of engine
Example is counted, and analyzes the spectral characteristic and noise intensity of engine noise signal.
6. method of work as claimed in claim 5, it is characterized in that：In the step (4), each operating mode combustion noise frequency spectrum is established
Characteristic and noise intensity and pinking peak combustion pressure and the corresponding relation of body vibration acceleration value size in cylinder, it is determined that not
With detonating combustion pressure value and the corresponding relation of body vibration acceleration value size and knock intensity, pinking is established with this and sentenced
Disconnected standard.
7. method of work as claimed in claim 5, it is characterized in that：In engine testing laboratory bench test or vehicle road test
It is middle to be used as the foundation of independent judgment pinking by the use of detonating combustion pressure value or body vibration acceleration value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102016218673B4 (en) * | 2016-09-28 | 2019-03-28 | Robert Bosch Gmbh | Method and device for knock detection of an internal combustion engine |
| CN109406155A (en) * | 2018-12-21 | 2019-03-01 | 中国人民解放军空军工程大学 | Rotation detonation engine state monitoring apparatus and method based on vibration signal |
| CN112665862A (en) * | 2020-09-27 | 2021-04-16 | 东风商用车有限公司 | Method and device for detecting combustion condition in engine cylinder |
| CN114061960A (en) * | 2021-11-11 | 2022-02-18 | 中国煤炭科工集团太原研究院有限公司 | Explosion-proof test bin of directional explosion venting type mining diesel engine |
| CN114909226B (en) * | 2022-05-31 | 2023-08-22 | 重庆长安汽车股份有限公司 | Method and system for controlling engine light-off working condition pumping and automobile |
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