CN107304711A - Natural gas engine system and its tempering detection unit and method - Google Patents
Natural gas engine system and its tempering detection unit and method Download PDFInfo
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- CN107304711A CN107304711A CN201610258148.4A CN201610258148A CN107304711A CN 107304711 A CN107304711 A CN 107304711A CN 201610258148 A CN201610258148 A CN 201610258148A CN 107304711 A CN107304711 A CN 107304711A
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- 238000005496 tempering Methods 0.000 title claims abstract description 121
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 239000003345 natural gas Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 10
- 239000008246 gaseous mixture Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000002547 anomalous effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Natural gas engine system and its tempering detection unit and method, wherein, in there are following situations at least two when determine that flashback event occurs for engine：Situation 1：The changing value that the engine charge pressure collected is more than between admission pressure limiting value and the double admission pressure collected is more than admission pressure change limitation value；Situation 2：The λ value collected drops to less than λ limiting values；Situation 3：The changing value of the intake air temperature collected in a special time period is more than intake air temperature change limitation value.
Description
Technical field
The application is related to a kind of tempering detection unit and method for natural gas engine, and bag
Engine system containing this tempering detection unit.
Background technology
For the engine using port fuel supply mode, the gaseous mixture in air intake duct is ignited
Phenomenon be referred to as engine flashback.Natural gas engine for being premixed technology using air intake duct, is returned
Fiery phenomenon is more universal.Tempering can not only have a strong impact on the performance of engine, for example, causing to start
Machine quiet rum hydraulic performance decline.Also, tempering may cause engine components to damage, for example, entering
Gas choke valve etc. is damaged, and serious tempering may cause air intake duct to burst.
Therefore, engine flashback is timely detected, is started for the normal operation of engine and protection
It is important for machine part.The detection technique that fuel engines is tempered generally is related in the prior art
And the anomalous variation of pressure, the temperature etc. in detection gas handling system.
For NGV, need also exist for detecting engine flashback.But, fuel oil starts
The tempering detection technique in machine field may not be applied to natural gas engine.
The content of the invention
The application aims to provide a kind of technology for reliably detecting natural gas engine tempering.
Therefore, according to the application, there is provided a kind of tempering detection for natural gas engine system
Air inlet pressure sensor, the intake air temperature sensor of unit, the tempering detection unit and engine
With exhaust gas oxygensensor connection to gather the measurement parameter of each sensor, and it is configured to following in appearance
In situation at least two when determine engine occur flashback event：
Situation 1：The engine charge pressure that air inlet pressure sensor is collected is more than admission pressure pole
Changing value between limit value and the double admission pressure collected changes more than admission pressure
Limiting value；
Situation 2：The λ value that exhaust gas oxygensensor is collected is less than λ limiting values；
Situation 3：The Engine Inlet Temperature that intake air temperature sensor is collected in special time period
Changing value is more than intake air temperature change limitation value.
According to a kind of embodiments possible, the air inlet pressure sensor is to be arranged in entering for engine
Intake manifold pressure sensor in gas manifold.
Or, the air inlet pressure sensor is that the air inlet pipe being arranged in the air inlet pipe of engine increases
Pressure pressure sensor, it is located between choke valve and charge air cooler preferably in air inlet pipe, more preferably leaned on
Nearly choke valve.
According to a kind of embodiments possible, the λ limiting values are selected in the range of 0.65 to 0.95
Take, such as about 0.85.
According to a kind of embodiments possible, the exhaust gas oxygensensor is that can export the width of continuous measurements
Domain oxygen sensor, its measurement range is 0.65~infinity.
According to a kind of embodiments possible, the intake air temperature sensor is to be arranged in engine charge
Air inlet pipe boosted temperature sensor in pipe, it is located at choke valve and charge air cooler preferably in air inlet pipe
Between, more preferably close to choke valve.
Or, the intake air temperature sensor is the air inlet discrimination being arranged in the inlet manifold of engine
Pipe temperature sensor.
According to a kind of embodiments possible, the tempering detection unit determines to be tempered by following programs
Event occurs：
Starting point detection program is tempered, wherein, the situation 1 is used as the main judgement of tempering starting point
Benchmark, to determine to be tempered starting point；With
The tempering proving program performed after tempering starting point is determined, wherein, the He of situation 2
Situation 3 is used for checking tempering to be occurred really.
According to a kind of embodiments possible, in tempering starting point detection program, situation 2 is used as
Auxiliary judgment benchmark.
According to a kind of embodiments possible, the tempering detection unit record tempering moment engine
Operational factor.
According to a kind of embodiments possible, each limiting value is demarcated for real engine system.
According to a kind of embodiments possible, data sampling interval of the tempering detection unit to each sensor
For 0.1 second or shorter.
Present invention also provides a kind of natural gas engine system, including：
Engine；
Intake manifold pressure sensor, MAT sensing for measuring engine parameter
Device, air inlet pipe boost-pressure sensor, air inlet pipe boosted temperature sensor and exhaust gas oxygensensor；
Previously described tempering detection unit, it is connected to air inlet can gather measurement parameter mode
One of manifold pressure sensor and air inlet pipe boost-pressure sensor, air inlet pipe boosted temperature sensor
With one of MATS, exhaust gas oxygensensor.
In this natural gas engine system, the intake manifold pressure sensor, inlet manifold
Temperature sensor, air inlet pipe boost-pressure sensor, air inlet pipe boosted temperature sensor are respectively list
Only sensor.
Or, the intake manifold pressure sensor and MATS are integrated into single
Temperature and pressure transmitter, the air inlet pipe boost-pressure sensor, air inlet pipe boosted temperature sensing
Device is integrated into single temperature and pressure transmitter.
Present invention also provides a kind of flashback-detecting method for natural gas engine system, especially
It is the method implemented using previously described tempering detection unit, comprises the steps：
Gather admission pressure, intake air temperature and the λ value of engine；And
In there are following situations at least two when determine that flashback event occurs for engine：
Situation 1：The engine charge pressure collected is more than admission pressure limiting value and continuous
Changing value between the admission pressure collected twice is more than admission pressure change limitation value；
Situation 2：The λ value collected drops to less than λ limiting values；
Situation 3：The changing value of the intake air temperature collected in a special time period is more than into temperature
Spend change limitation value.
It may be noted that the natural gas engine system of previously described the application and tempering detection unit
In various features, be equally applicable in the flashback-detecting method of the application.
According to the application, the tempering detection technique for natural gas engine system can be examined reliably
The generation of engine flashback is measured, to remind user to overhaul vehicle to vehicle maintenance place in time,
Avoid because tempering causes engine system components to be damaged.The tempering detection technique of the application can be monitored
The number of times that the tempering of a period of time intrinsic motivation occurs, and may record when tempering occurs in engine
Running parameter, these data can be determined by maintenance librarian use produce tempering the reason for, so as to
Rapidly removing faults.
Brief description of the drawings
The foregoing and other side of the application by by being discussed in detail of being done with reference to the accompanying drawings and
It is more fully understood from, wherein：
Fig. 1 is a kind of schematic layout figure of the natural gas engine system according to the application；
Air- distributor pressure in test experience and air inlet pipe supercharging occur for the tempering that Fig. 2 is the application
The curve map of pressure；
Fig. 3 is that the curve map of the air inlet pipe boosted temperature in test experience occurs for the tempering of the application；
Fig. 4 is that the curve map of the λ value in test experience occurs for the tempering of the application；
Fig. 5 is that throttle valve opening and engine speed in test experience occur for the tempering of the application
Curve map；
Fig. 6 is a kind of flow chart of the tempering detection program according to the application；
Fig. 7 is a kind of flow chart that program is detected according to the tempering starting point of the application；
Fig. 8 is a kind of flow chart of the tempering proving program according to the application.
Embodiment
Present invention relates generally to a kind of natural gas engine system, it is included according to the application
Tempering detection unit.The tempering detection unit utilizes the existing sensing of natural gas engine system
Device and actuator implement tempering detection, and it can be configured to individually be tempered detection unit, can also
In the control unit for being integrated in the central control unit of vehicle or engine system.
Fig. 2 shows the total arrangement of this natural gas engine system.As illustrated, the day
Right gas engine system mainly includes：Engine 1, it includes multiple cylinders 2；Air inlet pipe 3；It is logical
The inlet manifold 4 being connected to each cylinder 2 and with air inlet pipe 3, for each cylinder 2 supply by
Air and the gaseous mixture of natural gas that air inlet pipe 3 is introduced；Blast pipe 5；Lead to each cylinder 2 and
The exhaust manifold 6 being connected with blast pipe 5, after being burnt from each cylinder 2 through the discharge of blast pipe 5
Waste gas；The charging turbine 7 between air inlet pipe 3 and blast pipe 5 is arranged in, it is by blast pipe 5
In waste gas promote rotation, and by the supercharging air in air inlet pipe 5 towards downstream transport；
Charge air cooler 8 of the arranged downstream of charging turbine 7 in air inlet pipe 3, for cooling down in air inlet pipe 3
The air heated up by supercharging；The throttling in the tract of air inlet pipe 3 is arranged in close to inlet manifold 4
Valve 9, for adjusting the air capacity that air inlet pipe 3 is supplied to each cylinder 2；It is tight in the downstream of choke valve 9
Adjacent choke valve 9 is arranged in the blender 10 in air inlet pipe 3；Natural gas tube 11, it leads to mixing
Device 10, for supplying natural gas into blender 10, natural gas is mixed with air in blender 10
Close and produce gaseous mixture, the gaseous mixture is supplied in each cylinder 2 through inlet manifold 4；It is cold in
Between device 8 and choke valve 9, such as, in the position close to choke valve 9, it is arranged in air inlet pipe 3
Air inlet pipe boost-pressure sensor 12 and air inlet pipe boosted temperature sensor 13；It is arranged in air inlet
Intake manifold pressure sensor 14 and MATS 15 in manifold 4；It is arranged in
Exhaust gas oxygensensor (lambda sensor) 16 in blast pipe 5, for example, it is arranged in charging turbine 7
Downstream position.
Exhaust gas oxygensensor 16 is can export the broad domain oxygen sensor of continuous measurements, and its measurement range is
0.65~infinitely great (air).
In addition, above-mentioned engine system also includes tempering detection unit 20, it increases with the air inlet pipe
Pressure pressure sensor 12, air inlet pipe boosted temperature sensor 13, intake manifold pressure sensor 14,
Some in MATS 15 and exhaust gas oxygensensor or all communication connections, are used for
The parameter that these sensors are collected is received, and judges tempering thing based on some in these signals
The generation of part.
According to a kind of embodiments possible, the air inlet pipe boost-pressure sensor 12 and air inlet pipe
Boosted temperature sensor 13 can be integrated into single pressure-temperature sensor, its measure simultaneously into
Tracheae boosted temperature and pressure.Equally, intake manifold pressure sensor 14 and MAT
Sensor 15 is to be integrated into single pressure-temperature sensor, and it measures MAT simultaneously
And pressure.
Why the tempering detection unit 20 of the application judges the hair of flashback event based on above-mentioned parameter
It is raw, it is to be determined by the testing result being tempered accordingly in generation test experience.This is described below
Apply for occurring done experiment for detection tempering.
First, in Fig. 1 natural gas engine system (without tempering detection unit 20) is placed in
On experimental bench.Compressed natural gas source is connected to natural gas tube 11.In natural gas tube 11, with
And between gas source and natural gas tube 11, suitable regulator is equipped with, it is natural to cause
Gas is fed in natural gas tube 11 with suitable pressure, temperature, flow etc..
Engine 1 keeps operating after starting, and the flashback event during operating is detected.For example,
By the mutation of the pressure in engine system, temperature, sound etc., or by abnormal flash of light etc.,
Determine flashback event.In multiple flashback events, the parameter in engine system is detected, to divide
Intensity of variation of these parameters in flashback event is analysed, so that it is determined which parameter can be used for determining
Flashback event.
Some important parameters being detected in tempering experiment include：
The air inlet pipe supercharging pressure for the upstream of choke valve 9 detected by air inlet pipe boost-pressure sensor 12
Power Pvd；
The air inlet pipe supercharging temperature for the upstream of choke valve 9 detected by air inlet pipe boosted temperature sensor 13
Spend Tvd；
The air- distributor pressure Psr detected by intake manifold pressure sensor 14；
The MAT Tsr detected by MATS 15；
The actual air inflow of the air excess factor detected by exhaust gas oxygensensor 16, i.e. engine and theory
The ratio between air inflow, can be used for the air-fuel ratio of the gaseous mixture of control input engine；And
Detected by respective sensor or the throttle valve opening Wt from system data, engine speed
Ve, ECT, accelerator pedal position, engine ignition angle etc..
In the operation process of engine 1, these parameters with collected, and when being tempered generation this
Whether a little parameters, which undergo mutation, is particularly concerned.
Air- distributor pressure Psr and air inlet pipe boost pressure in a period are shown in Fig. 2
Pvd change, is once tempered in the period.It can be noted that being tempered thing in this time
The starting point t0 of part, air- distributor pressure Psr and air inlet pipe boost pressure Pvd synchronously drastically change,
I.e. steep increase arrives peak value Psr_peak and Pvd_peak, is then drastically fallen after rise in the short time again, even
Fall back to the numerical value before slightly below steep increasing.
The change of air inlet pipe boosted temperature Tvd in a period, the time are shown in Fig. 3
Once it is tempered in section.In order to mark time relationship, air- distributor pressure Psr curve
It is illustrated.It can be noted that air inlet pipe boosted temperature Tvd is then after flashback event starting point t0
Gradually increase, and passing through one section of time delay Δ t1 (more 2 from flashback event starting point t0
To between 3 seconds) after reach air inlet pipe boosted temperature peak value Tvd_peak, then gradually fall after rise.To the greatest extent
Pipe Tvd value is increased with certain slope, but peak value Tvd_peak is still much larger than flashback event
Preceding Tvd values.Equally, although being not shown, MAT Tsr shows and entered
Trend similar tracheae boosted temperature Tvd.
The change of air excess factor in a period is shown in Fig. 4.During in order to mark
Between relation, air- distributor pressure Psr curve is also shown as.It can be noted that in flashback event
λ value starts drastically after one section of time delay Δ t2 (being generally zero point several seconds) after starting point t0
Change, i.e., reduce to minimum λ _ trough suddenly.After the short time after minimum λ _ trough occurs,
λ value is quickly increased with certain slope, or even increases to above the number before flashback event starting point t0
Value.Time delay Δ t2 is shorter than the time delay Δ t1 in Fig. 3.
The rotating speed of the aperture of choke valve 9 and engine 1 in a period is shown in Fig. 5
Change.In order to mark time relationship, air- distributor pressure Psr curve is also shown as.It can note
Anticipate and arrive, when this flashback event starting point t0 air- distributor pressures Psr increases suddenly, throttle valve opening
Wt slightly declines.When air- distributor pressure Psr reaches steep drop in the short time after its peak value, throttling
Valve opening Wt minimizes value suddenly therewith, afterwards, throttle valve opening Wt with certain slope gradually
Increase and recover the level before flashback event.
It is same it can be noted that after this flashback event starting point t0, engine speed Ve
It is gradually reduced, is gradually increasing again afterwards, declines again afterwards but the range of decrease is less than previous decline, afterwards
Rise again but increasing degree is less than previous rising, the water so returned in concussion mode before flashback event
It is flat.On above-mentioned other engine parameters, operated in the engine comprising flashback event
Also it is detected in journey.
It can substantially determine occur in the flashback event in the operating of engine 1 by many experiments
The parameter of great change includes following five：Gas manifold pressure Psr, air inlet pipe boost pressure Pvd, enters
Gas collector temperature Tsr, air inlet pipe boosted temperature Tvd, and air excess factor.These parameters
Acute variation can represent the generation of flashback event.Therefore, one in this five parameters can be used
A little change judges flashback event.
On engine speed Ve, experiment shows that it shakes after flashback event, but together
The parameter of above-mentioned acute variation is compared, and shock range is relatively small.Therefore, the application is it is determined that return
During fiery event, engine speed Ve is not selected.
On throttle valve opening Wt, experiment shows, it always drastically declines after flashback event,
Then gradually recover.The aperture change of choke valve 9 is probably the result of tempering impact, and can lead
Cause the decline of air excess factor.Because throttle valve opening is a control parameter, and it becomes
Change is relevant with the change of air excess factor, therefore, in the illustrative embodiments of the application
In, flashback event is determined from air excess factor, without selecting throttle valve opening.
On the problem of λ value, further being analyzed here after tempering starting point.First, engine system
System is by central control unit closed-loop control.When engine occur tempering and cause inlet manifold and
In air inlet pipe after pressure rise, ECU can think the increase of air inlet pipe air inflow, so as to control natural gas
Pipe 11 correspondingly increases natural gas injection amount (the actual natural gas injection time significantly extends), therefore
Natural gas injection amount increase causes required theoretical air inflow to increase.Due to actually air inlet pipe air inlet
Amount does not increase, so that λ value declines.
The application is intended to detect flashback event according to the change of engine parameter.Therefore, the application
Enough and different types of parameter is chosen as far as possible as detection foundation.
Because the air- distributor pressure Psr in flashback event and air inlet pipe boost pressure Pvd synchronously becomes
Change, therefore, the application is used to detect tempering using alternative one.
Equally, MAT Tsr change has similar with air inlet pipe boosted temperature Tvd
Trend, therefore, the application are used to detect tempering using alternative one.
According to a kind of illustrative embodiments, the application uses air- distributor pressure Psr, air inlet pipe
Boosted temperature Tvd and λ value detect tempering.It is appreciated that air inlet pipe boost pressure Pvd and entering
Gas collector temperature Tsr can also be used as replacement.
According to being determination tempering selected parameter in tempering detection unit 20, detection unit 20 is tempered
It is connected with the respective sensor for measuring the parameter, is used to be tempered to gather their measurement parameter
Detection.
According to a kind of illustrative embodiments, tempering detection unit 20 is in there are following situations
Determine that flashback event occurs for engine 1 when at least two：
Situation 1：Air- distributor pressure Psr is more than its limiting value Psr_limit, and the limiting value can pin
Specific engine system is determined by testing, for example, Psr_limit takes such as about 1000hPa；
And the changing value Δ Psr of the air- distributor pressure Psr between double sampled point is more than its pole
Limit Δ Psr_limit, the limiting value can be directed to specific engine system and be determined by testing, for example,
Δ Psr excursion is about 100 to 2000hPa in experiment, therefore Δ Psr_limit values
Scope can be 100 to 200hPa, and a specific example is about 130hPa；
Situation 2：λ value becomes smaller than its limiting value λ _ limit, and the limiting value can be for specifically starting
Machine system is determined by testing, for example, λ value excursion is 0.65 to 1.1 in experiment, therefore,
λ _ limit can value be 0.65 to 0.95, a specific example is about 0.85；
Situation 3：Air inlet pipe boosted temperature Tvd maximum changing value Δ Tvd_max in a period of time
More than its limiting value Δ Tvd_max limit, the limiting value can pass through examination for specific engine system
Determination is tested, for example, Tvd_max excursions within 2 seconds to 3 second time are about in experiment
18 to 35 DEG C, therefore, Δ Tvd_max limit can be taken as changing 18 in 2 seconds to 3 second time
To 25 DEG C, a specific example is about 20 DEG C.
It is appreciated that in situation 1, air- distributor pressure Psr change is turned into tempering detection
One of condition, is due to that air- distributor pressure Psr has property described below.Inlet manifold pressure
Steep increase arrives peak value to power Psr immediately after starting point is tempered, then steep within a very short time to drop, even
Fall below the level before tempering.Steep increasing mentioned here and steep drop actually finger are previously noted
The double parameter measured between changing value (value added or decreasing value) be more than the parameter
Change limitation value.
In situation 1, air- distributor pressure Psr can be replaced by air inlet pipe boost pressure Pvd.
In this case, because the excursion of air inlet pipe boost pressure Pvd in experiment is about 50
Limiting value to 3000hPa, therefore air inlet pipe boost pressure can take such as about 1100hPa,
The span of the change limitation value of air inlet pipe boost pressure can be 85 to 300hPa, a tool
Style is about 90hPa.
In situation 2, the change of λ value is turned to one of tempering testing conditions, is due to λ value
With property described below.λ value is prolonged after air- distributor pressure Psr reaches peak value by one section
Drop to minimum after the slow time, then bottom out.
In situation 3, by air inlet pipe boosted temperature Tvd change be turned to tempering testing conditions it
One, it is due to that air inlet pipe boosted temperature Tvd has property described below.Air inlet pipe boosted temperature
Tvd gradually increases after tempering starting point, and is passed through after air- distributor pressure Psr reaches peak value
Peak value is reached after spending one section of time delay, is then slowly fallen after rise.Time delay ratio in situation 3
Time delay in situation 2 is long.
In situation 3, air inlet pipe boosted temperature Tvd can be replaced by MAT Tsr.
In this case, due in experiment air inlet pipe boosted temperature Tvd became within 2 seconds to 3 second time
It is about 6 to 30 DEG C to change scope, and therefore, the maximum changing value of air inlet pipe boost pressure can be taken as 2
Change 6 to 25 DEG C in second to the 3 second time, a specific example is about 8 DEG C or 10 DEG C.
From above to air- distributor pressure, λ value, air inlet pipe boosted temperature these three different aspects
The analysis of variation characteristic of the parameter in engine flashback can be seen that because they are returned in engine
All there is typical and different from each other variation characteristic when fiery, therefore the application chooses them to detect hair
Motivation is tempered, and accuracy in detection can be improved most possibly.
Tempering detection unit 20 may include alarm device, for during vehicle is run by engine
The flashback event (potentially including the information such as times of tempering) of generation is reported to user.
In addition, the limiting value that the application is used for the parameters of tempering detection is all exemplary,
In practical application, they can specially be demarcated according to specific engine system.
In addition, the application is used for some being tempered in the parameters of detection or some can be used for back
Fiery starting point detection, other can be tempered checking, so that by being tempered starting point detection and being tempered
Verify that the two processes judge flashback event exactly.
Root can perform figure in a kind of illustrative embodiments, the tempering detection unit 20 of the application
Tempering detection program (flashback-detecting method for constituting the application) shown in 6.
First, in step S1, tempering detection is started.
Next, in step S2, determining whether the possibility that tempering occurs, specifically can determine whether mark
Whether note value B_bf_st is equal to 1.If it is judged that being "No", then step S3 is gone to；Such as
Fruit judged result is "Yes", then goes to step S4.
In step S3, tempering starting point detection is carried out.In this step, in flashback event
The air- distributor pressure Psr that immediately great change occurs for starting point t0 (referring to Fig. 2) is used as main judgement
Benchmark.If air- distributor pressure Psr factors can not be absolutely proved in the presence of tempering starting point, can
Tempering starting point is detected so that λ value is used as into auxiliary judgment benchmark, because λ value is in tempering starting point
It can drastically decline after short time afterwards, so can more reliably detect tempering starting point.In step
After rapid S3 is performed, step S5 is returned to.
In step S4, tempering checking is carried out.In this step, air inlet pipe boosted temperature Tvd
(or MAT Tsr) and λ value are used for the true generation of checking tempering, it is to avoid erroneous judgement.
After step s4, step S5 is performed, whole tempering detection terminates, wherein, if any returning
Fiery event then reports that to user the related data related to tempering is recorded.
The mark value B_bf_st in program is tempering starting point detection mark above, and it is represented for 0
In the absence of tempering starting point, that is, be not in flashback event, it is indicated in the presence of tempering starting for 1
The possibility of point, it is possible to flashback event (whether be truly present flashback event still need checking) occurs.
Above-mentioned tempering detection program can be called repeatedly.It is appreciated that the parameter of some in flashback event
Change events it is extremely short, therefore, it is intended that the called time interval (bag of above-mentioned tempering detection program
Include the sampling interval of each parameter) it is short enough, for example, 0.1 second or less.
According to a kind of embodiments possible, tempering starting point detecting step S2 above can pass through figure
Exemplary tempering starting point detection program shown in 7 realizes that it includes steps described below.
In step S11, start tempering starting point detection.
Next, in step S12, judging whether that Psr is more than its limiting value Psr_limit (for example
About 1000hPa) and double sampled point between air- distributor pressure changing value Δ Psr
More than its limiting value Δ Psr_limit (such as about 130hPa)；If it is judged that be "Yes",
Step S13 is then gone to, if it is judged that being "No", then step S15 is gone to.
In step S13, mark value B_con_psr value is taken 1, step S14 is then gone to.
In step S14, mark value B_bf_st value is taken 1, step S17 is then gone to.
In step S15, judge whether λ value is less than its limiting value λ _ limit (such as about 0.85)；
If it is judged that being "Yes", then step S16 is gone to, if it is judged that being "No", then
Go to step S17.
In step S16, mark value B_con_lam value is taken 1, step S14 is then gone to.
In step S17, terminate tempering starting point detection program.
The mark value B_con_psr in program is the mark whether air inlet meets tempered condition above
Know, it is that 0 expression air inlet is unsatisfactory for tempered condition, is that 1 expression air inlet meets tempered condition.
Mark value B_con_lam is the mark whether λ meets tempered condition, and it is 0 expression λ
Value is unsatisfactory for tempered condition, is that 1 expression λ value meets tempered condition.
Program is detected by being tempered starting point, it can be determined that the condition that flashback event occurs is full at one's side
Whether foot, i.e., be likely to occur flashback event.
According to a kind of embodiments possible, tempering verification step S3 above can be by shown in Fig. 8
Exemplary tempering proving program realize, it includes steps described below.
In step S21, start to be tempered proving program.
Next, in step S22, adding 1 by count value tc_bf_dec.
Next, in step S23, judging whether count value tc_bf_dec is less than tc_bf_thr；Such as
Fruit judged result is "No", then goes to step S28, if it is judged that being "Yes", is then turned
To step S24.
Whether it is equal to 1 in step S24, judge mark value B_con_psr；If it is judged that being
"Yes", then go to step S25, if it is judged that being "No", then goes to step S26.
In step S25, judge whether λ value is less than its limiting value λ _ limit (such as about 0.85),
If it is judged that being "Yes", then step S27 is gone to, if it is judged that being "No", then
Go to step S26.
In step S26, judge whether the maximum changing value Δ Tvd_max of air inlet pipe boosted temperature is big
In its limiting value Δ Tvd_max limit (such as about 20 DEG C)；If it is judged that be "No",
Step S29 is then gone to, if it is judged that being "Yes", then step S27 is gone to.
In step S27, count value bf_hap_count is added 1, step S28 is then gone to.
In step S28, by each value B_con_lam, B_con_psr, B_bf_st and tc_bf_dec
It is zeroed.
Next, in step S29, terminating tempering proving program.
The count value tc_bf_dec in program adds up secondary for what tempering proving program was performed above
Number, the maximum times (threshold value) that tc_bf_thr can be performed for tempering proving program,
Bf_hap_count is the cumulative number for occurring flashback event.Although tc_bf_dec is count value,
It is exactly to complete checking within a certain period of time, because the change of temperature but what it reflected in fact is the time
Change is completed within a certain period of time.
By being tempered proving program, it can confirm that in one section of engine on time and actually occur tempering
The cumulative number of event.
Each parameter in one section of engine on time is also can record in the tempering detection program of the application
Situation of change, especially flashback event occur when change, for example, can note down tempering the moment
The operational factor of engine, such as ignition advance angle.
Flashback event frequency, and the Parameters variation situation that may be recorded, can be in engine system
System is diagnosed and useful information is provided when repairing.
In process described above, air- distributor pressure Psr can be replaced air inlet pipe boost pressure
Pvd, air inlet pipe boosted temperature Tvd can be replaced MAT Tsr.
It is appreciated that according to specific needs, the tempering of the application can be detected program (including
Its tempering starting point included detect program and tempering proving program) in specific steps and parameter
Make various modifications.
It is further appreciated that (including tempering starting in previously described exemplary tempering detection program
Point detection program and tempering proving program) in, foregoing three situations 1~3 are used for corresponding successively
Judgment step.The reason is that when being tempered, air- distributor pressure Psr (or air inlet pipe increases
Pressure pressure Pvd) change at first, next to that λ value, be finally air inlet pipe boosted temperature Tvd (or
MAT Tsr).λ value is shorter relative to tracheae boosted temperature Tvd change lag times,
Therefore the λ value change moment is close with the tempering generation moment.
It may be noted that in conventional gasoline vehicle engine system, usually used narrow oxygen is passed
Sensor is output as step signal, and it is dilute or dense to be used to refer to gaseous mixture, it is impossible to provide continuous
The oxygen concentration measurements of change.Unlike this, in order to based on λ value progress tempering inspection in the application
Survey, the exhaust gas oxygensensor used is can export the broad domain oxygen sensor of continuous measurements.Using this
The broad domain oxygen sensor of sample so that the tempering detection of the application is reliably achieved.
In the tempering detection unit and method according to the application, returning for engine system is monitored
There are the pressure of typical change feature, temperature, λ value these three parameters when fiery, and at least two
The generation of tempering is determined when abnormal parameters change, therefore, it is possible to avoid judging by accident most possibly and leak
Sentence, so as to improve the degree of accuracy that tempering judges.
Therefore, although describe the application herein with reference to specific embodiment, but the application
Scope be not limited to shown details.In the situation of the general principle without departing from the application
Under, various modifications can be made for these details.
Claims (12)
1. a kind of tempering detection unit (20) for natural gas engine system, the tempering inspection
Survey air inlet pressure sensor, intake air temperature sensor and the exhaust gas oxygensensor (16) of unit and engine
Connection is configured in there are following situations extremely to gather the measurement parameter of each sensor
Determine that flashback event occurs for engine when few two：
Situation 1：The engine charge pressure that air inlet pressure sensor is collected is more than admission pressure pole
Changing value between limit value and the double admission pressure collected changes more than admission pressure
Limiting value；
Situation 2：The λ value that exhaust gas oxygensensor is collected is less than λ limiting values；
Situation 3：The Engine Inlet Temperature that intake air temperature sensor is collected in special time period
Changing value is more than intake air temperature change limitation value.
2. detection unit is tempered as claimed in claim 1, wherein, the admission pressure sensing
Device is the intake manifold pressure sensor (14) being arranged in the inlet manifold of engine (4)；Or
Person
The air inlet pressure sensor is that the air inlet pipe being arranged in the air inlet pipe of engine (3) increases
Pressure pressure sensor (12), it is cold with that it is located at choke valve (9) preferably in air inlet pipe (3)
Between device (8), more preferably close to choke valve (9).
3. detection unit is tempered as claimed in claim 1 or 2, wherein, the λ limiting values
Chosen in the range of 0.65 to 0.95, such as about 0.85.
4. detection unit is tempered as claimed any one in claims 1 to 3, wherein, the λ
Sensor is can export the broad domain oxygen sensor of continuous measurements, and its measurement range is 0.65~nothing
It is poor big.
5. the tempering detection unit as any one of Claims 1-4, wherein, it is described
Intake air temperature sensor is the air inlet pipe boosted temperature sensing being arranged in engine air inlet tube (3)
Device (13), it is located between choke valve (9) and charge air cooler (8) preferably in air inlet pipe (3),
More preferably close to choke valve (9)；Or
The intake air temperature sensor is the air inlet discrimination being arranged in the inlet manifold of engine (4)
Pipe temperature sensor (15).
6. the tempering detection unit as any one of claim 1 to 5, wherein, it is described
Tempering detection unit determines flashback event by following programs：
Starting point detection program is tempered, wherein, the situation 1 is used as the main judgement of tempering starting point
Benchmark, to determine to be tempered starting point；With
The tempering proving program performed after tempering starting point is determined, wherein, the He of situation 2
Situation 3 is used for checking tempering to be occurred really；
Alternatively, in tempering starting point detection program, situation 2 is used as auxiliary judgment benchmark.
7. the tempering detection unit as any one of claim 1 to 6, wherein, it is described
It is tempered the operational factor of detection unit record tempering moment engine.
8. the tempering detection unit as any one of claim 1 to 7, wherein, each pole
Limit value is demarcated for real engine system.
9. the tempering detection unit as any one of claim 1 to 8, wherein, tempering
Detection unit is to the data sampling of each sensor at intervals of 0.1 second or shorter.
10. a kind of natural gas engine system, including：
Engine (1)；
Intake manifold pressure sensor (14), MAT for measuring engine parameter
Sensor (15), air inlet pipe boost-pressure sensor (12), air inlet pipe boosted temperature sensor (13)
With exhaust gas oxygensensor (16)；
Tempering detection unit as claimed in any one of claims 1-9 wherein, it is can gather survey
Amount parameter mode is connected to intake manifold pressure sensor (14) and air inlet pipe boost-pressure sensor
(12) one of, air inlet pipe boosted temperature sensor (13) and MATS (15)
One of, exhaust gas oxygensensor (16).
11. natural gas engine system as claimed in claim 10, wherein, the air inlet discrimination
Pipe pressure sensor (14), MATS (15), air inlet pipe boost pressure sensing
Device (12), air inlet pipe boosted temperature sensor (13) are respectively single sensor；Or
The intake manifold pressure sensor (14) and MATS (15) are integrated
For single temperature and pressure transmitter, the air inlet pipe boost-pressure sensor (12), air inlet pipe
Boosted temperature sensor (13) is integrated into single temperature and pressure transmitter.
12. a kind of flashback-detecting method for natural gas engine system, comprises the steps：
Gather admission pressure, intake air temperature and the λ value of engine；And
In there are following situations at least two when determine that flashback event occurs for engine：
Situation 1：The engine charge pressure collected is more than admission pressure limiting value and continuous
Changing value between the admission pressure collected twice is more than admission pressure change limitation value；
Situation 2：The λ value collected drops to less than λ limiting values；
Situation 3：The changing value of the intake air temperature collected in a special time period is more than into temperature
Spend change limitation value.
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| CN107304711B (en) | 2021-03-05 |
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