CN106770978B - A kind of natural gas engine divides cylinder mixture strength measuring system and measurement method - Google Patents
A kind of natural gas engine divides cylinder mixture strength measuring system and measurement method Download PDFInfo
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- CN106770978B CN106770978B CN201710051810.3A CN201710051810A CN106770978B CN 106770978 B CN106770978 B CN 106770978B CN 201710051810 A CN201710051810 A CN 201710051810A CN 106770978 B CN106770978 B CN 106770978B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels, explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses a kind of natural gas engines to divide cylinder mixture strength measuring system and measurement method, and the measuring system is by taking air pipe, signal pickup assembly, ECU and host to form.The present invention takes position and direction of the tracheae in enmgine exhaust by simulation calculation and test determination, engine crankshaft sensor is acquired by ECU hardware and software and camshaft-signal sensor signal determines engine timing signal, according to phase controlling solenoid valve open and close, and each cylinder λ value is acquired using broad domain oxygen sensor real-time measurement, by being communicated with host computer, upload related data, avoid influence of other cylinders to measurement cylinder in mixture strength measurement process, and energy real-time measurement, display and record, keep the measurement of score cylinder mixture strength accurate and true, it solves in natural gas engine development process, the problem of each cylinder mixture strength cannot accurately be measured.
Description
Technical field
The technical field of measuring equipment that the invention belongs to design in engine test development process, in particular to it is a kind of natural
Gas engine divides cylinder mixture strength measuring system and measurement method.
Background technique
Currently, as countries in the world are to the pay attention to day by day of the energy and environment, and to the higher fuel economy of automobile and
The continuous pursuit of lower pollutant emission target, natural gas engine were rapidly developed in recent years.
But existing natural gas engine is not pass through special design from diesel engine transformation mostly.Cause
This haves the defects that the defect causes since each cylinder distribution non-evenness and each cylinder mixture strength of nozzle scattered error bring are different
The phenomenon that each cylinder gas burning is inconsistent, causes the cylinder that has that pinking occurs, and some cylinders catch fire, this sends out natural gas
The exploitation of motivation and calibration are very unfavorable.
Summary of the invention
For above-mentioned the technical problems existing in the prior art, the present invention provides a kind of natural gas engines, and cylinder to be divided to mix
Gas concentration measuring system and measurement method solve in natural gas engine development process, cannot accurately measure each cylinder mixing
The problem of gas concentration, in conjunction with Figure of description, technical scheme is as follows:
A kind of natural gas engine divides cylinder mixture strength measuring system, and the measuring system is by taking air pipe, signal to adopt
Acquisition means, measuring device, ECU and host composition；
It is described to take air pipe by enmgine exhaust 1, air delivering pipeline 2, jointing 3, first the 4, second electricity of solenoid valve
Magnet valve 7, tailpipe 8 and whirlpool heel row tracheae 10 form；The inlet end of the air delivering pipeline 2 is put in respectively to engine exhaust discrimination
Pipe 1 is respectively in charge of in interface, and the inlet end of air delivering pipeline 2 is fixed on exhaust manifold 1；The other end connection of air delivering pipeline 2 is extremely arranged
The air inlet of gas tail pipe 8, the whirlpool heel row tracheae 10 are connected to the gas outlet of tailpipe 8；First solenoid valve 4 and the second electromagnetism
Valve 7 is separately mounted to the both ends of air delivering pipeline 2；
The signal pickup assembly is made of crankshaft sensor 13 and camshaft-signal sensor 14；Crankshaft sensor 13 and cam
Axle sensor 14 is connect with ECU12 signal respectively；
The measuring device is made of broad domain oxygen sensor 6 and portable air-fuel ratio analyzer 11.The wide area oxygen sensing
Device 6 is separately mounted on air delivering pipeline 2, the excess air coefficient for real-time measurement acquisition each cylinder of natural gas engine；It is described
Broad domain oxygen sensor 6 is connect with 11 signal of portable air-fuel ratio analyzer respectively, the data that broad domain oxygen sensor 6 will measure
Signal is transmitted to portable air-fuel ratio analyzer 11；
The signal output end of the ECU12 and the signal input part communication connection of host 15.
A kind of natural gas engine divides cylinder mixture strength measuring system, wherein first solenoid valve 4 and the second electromagnetism
Valve 7 is all made of 600 degree of normal-closed electromagnetic valves of DN10 high temperature, and the solenoid valve is switch electromagnetic valve, response time 500ms,
Driving voltage 24V, driving current are less than 2A, can be 600 degree of high temperature resistant, 0.3~1.0MPa of pressure limit.
A kind of natural gas engine divides cylinder mixture strength measuring system, wherein the second solenoid valve 7 and tailpipe
8 are installed on fixed plate 9, are provided with mounting groove on the fixed plate 9, are machined with mounting hole in mounting groove, and described second
Solenoid valve 7 and tailpipe 8 are loaded in mounting groove, and are fastened by bolts part and are fixed on fixed plate 9.
Further, the tailpipe 8 is top closed, bottom opening pipe structure, is provided on 8 side wall of tailpipe
Threaded connection hole, the outlet side of air delivering pipeline 2 pass through the threaded connection hole and 8 inner cavity connection of tailpipe, tailpipe 8
It is provided with threaded connection slot on the side connecting with fixed plate 9, the bottom of tailpipe 8 is threadedly coupled with whirlpool heel row tracheae 10.
A kind of natural gas engine divides cylinder mixture strength measuring system, wherein the crankshaft sensor 13 and camshaft
Sensor 14 is that can be compatible with the two kinds of sensor of magnetoelectricity/Hall simultaneously.
A kind of natural gas engine divides cylinder mixture strength measuring system, wherein the broad domain oxygen sensor 6 passes through oxygen and passes
Sensor installation shell 5 is mounted on air delivering pipeline 2, and the lambda sensor installation shell 5 is the tubulose knot that both ends are threaded
Structure is provided with oxygen sensor mounting hole on one side wall, and threaded connection slot is provided on another side wall, and the lambda sensor installs shell
5 pass through the screw thread connection at both ends in the pipeline Road of air delivering pipeline 2, and broad domain oxygen sensor 6 is installed on lambda sensor installation shell
(5) at the oxygen sensor mounting hole of side, the threaded connection slot that lambda sensor installs shell (5) other side is used for lambda sensor
The fixation of shell 5 is installed.
A kind of natural gas engine divides cylinder mixture strength measuring system, wherein also pacifies in the lower part of the tailpipe 8
Equipped with a broad domain oxygen sensor 6.
A kind of above-mentioned natural gas engine divides the measurement method of cylinder mixture strength measuring system, and detailed process is as follows:
One, position and side of the air inlet of air delivering pipeline 2 in exhaust manifold 1 are determined by simulation calculation and test first
To, determine the first solenoid valve 4, second solenoid valve 7 and lambda sensor installation shell 5 exact position；
Two, the signal that engine crankshaft sensor 13 and camshaft-signal sensor 14 are acquired by ECU12, determines engine
Timing；
Three, the first solenoid valve 4 and second solenoid valve 7 on respective tube road are controlled in an engine wherein cylinder exhaust stroke
It opens or closes simultaneously, and using measured by the analysis in real time of portable air-fuel ratio analyzer 11, acquisition broad domain oxygen sensor 6
Excess air coefficient；
Four, communicated finally by with host 15, upload corresponding data, that is, realize to the measurement of a certain cylinder mixture strength,
Display and record.Compared with prior art, the beneficial effects of the present invention are:
A kind of natural gas engine provided by the invention divides cylinder mixture strength measuring system and measurement method, has filled up pair
The blank that each cylinder mixer concentration of natural gas engine measures, solves in natural gas engine development process, cannot
Accurately measure the problem of each cylinder mixture strength；Measuring device of the invention passes through test each cylinder gaseous mixture of natural gas engine
Concentration with this to evaluate the uniformity of each cylinder gaseous mixture, and then keeps each cylinder mixture strength identical by dividing cylinder to correct,
To guarantee the consistent of each cylinder combustion state of engine.
Detailed description of the invention
Fig. 1 is the general arrangement structural representation that a kind of natural gas engine of the present invention divides cylinder mixture strength measuring system
Figure；
Fig. 2 is that a kind of natural gas engine of the present invention divides the automatically controlled control of cylinder mixture strength measuring system to illustrate
Figure；
Fig. 3 a is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, DN10 high temperature 600
Spend the overall structure diagram of normal-closed electromagnetic valve；
Fig. 3 b is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, DN10 high temperature 600
Spend the bottom installation structure schematic diagram of normal-closed electromagnetic valve；
Fig. 4 a is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, lambda sensor installation
The schematic diagram of internal structure of shell；
Fig. 4 b is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, lambda sensor installation
The end structure illustration of shell；
Fig. 5 a is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, outside tailpipe
Portion's side structure schematic diagram；
Fig. 5 b is A-A cross-sectional view in Fig. 5 a；
Fig. 5 c is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, outside tailpipe
End surface structural schematic diagram；
Fig. 5 d is B-B cross-sectional view in Fig. 5 c；
Fig. 6 a is that a kind of natural gas engine of the present invention divides in cylinder mixture strength measuring system, the knot of fixed plate
Structure schematic diagram；
Fig. 6 b is schematic cross-section in the middle part of Fig. 6 a.
In figure:
1- enmgine exhaust, 2- air delivering pipeline, 3- jointing, the first solenoid valve of 4-,
5- lambda sensor installation shell, 6- broad domain oxygen sensor, 7- second solenoid valve, 8- tailpipe,
9- fixation plate, the whirlpool 10- heel row tracheae, 11- portable air-fuel ratio analyzer, 12-ECU,
13- crankshaft sensor, 14- camshaft-signal sensor, 15- host.
Specific embodiment
For the technical solution that the present invention is further explained, in conjunction with Figure of description, a specific embodiment of the invention is as follows:
As shown in Figure 1, there are six divide cylinder, corresponding six exhaust outlets for the natural gas engine designed in the present embodiment.This
Inventing the measuring system includes taking air pipe, signal pickup assembly, measuring device, ECU and host.
It is described that take air pipe include enmgine exhaust 1, air delivering pipeline 2, jointing 3, the first solenoid valve 4, second
Solenoid valve 7, tailpipe 8 and whirlpool heel row tracheae 10；There are six be independently in charge of interface and natural gas to the enmgine exhaust 1
Six points of cylinder exhaust outlets of engine are corresponding, match with enmgine exhaust 1, and the air delivering pipeline 2 shares the six roots of sensation, point
Six for not corresponding to enmgine exhaust 1 are independently in charge of interface, and the inlet end of each air delivering pipeline 2 puts in respectively to engine and arranges
Gas manifold 1 is respectively in charge of in interface, and is fixed on exhaust manifold 1 by the jointing 3；The outlet of six roots of sensation air delivering pipeline 2
Connection is distinguished to the tailpipe 8 in end, and the whirlpool heel row tracheae 10 is connected to the tail portion of tailpipe 8；In every gas transmission
Solenoid valve there are two being respectively mounted on pipeline 2, wherein the first solenoid valve 4 is mounted on the inlet end of air delivering pipeline 2, second solenoid valve 7
It is mounted on the outlet side of air delivering pipeline 2；As shown in figure 3, the solenoid valve is all made of 600 degree of normal-closed electromagnetic valves of DN10 high temperature,
The solenoid valve is switch electromagnetic valve, and response time 500ms, driving voltage 24V, driving current, can high temperature resistant less than 2A
600 degree, 0.3~1.0MPa of pressure limit.First solenoid valve 4 and second solenoid valve 7 two are installed respectively on air delivering pipeline 2
Solenoid valve effectively prevents influence of other cylinders to measurement cylinder in mixture strength measurement process, and can real-time measurement, display
And record, keep the measurement of score cylinder mixture strength accurate and true.
As shown in Figure 1, second solenoid valve 7 and tailpipe 8 described in six groups are installed on fixed plate 9；Such as Fig. 6 institute
Show, be provided with mounting groove on the fixed plate 9, mounting hole, the second solenoid valve 7 and tailpipe 8 are machined in mounting groove
It is loaded in mounting groove, and is fastened by bolts part and is fixed on fixed plate 9.
As shown in figure 5, the tailpipe 8 is top closed, bottom opening pipe structure, opened on 8 side wall of tailpipe
There are six threaded connection hole, the outlet side of air delivering pipeline 2 passes through the threaded connection hole and 8 inner cavity connection of tailpipe, row
Threaded connection slot, the bottom of tailpipe 8 and 10 spiral shell of whirlpool heel row tracheae are provided on the side that gas tail pipe 8 is connect with fixed plate 9
Line connects, and is also provided with a lambda sensor installing port in the lower sidewalls of tailpipe 8.
The signal pickup assembly includes crankshaft sensor 13 and camshaft-signal sensor 14, crankshaft sensor 13 and camshaft
The signal output end of sensor 14 is connect with the signal input part signal of ECU12 respectively, crankshaft sensor 13 and camshaft sensing
Collected signal data is sent to ECU12 by device 14, carries out engine speed judgement and engine hours benchmark for ECU12
Judgement；The crankshaft sensor 13 and camshaft-signal sensor 14 can be compatible with the two kinds of sensor of magnetoelectricity/Hall simultaneously, when making
When with Hall type sensor, when using magnetoelectricity type sensor, electricity can need to be designed using with by the way of Engine ECU
Flat conversion module converts the collected AC signal of magnetoelectricity type sensor to the square-wave signal of standard.
The measuring device includes broad domain oxygen sensor 6 and portable air-fuel ratio analyzer 11.The broad domain oxygen sensor 6
There are seven groups, wherein one group is mounted at the lambda sensor installing port of 8 lower section of tailpipe, remaining six groups pass through six oxygen respectively and pass
Sensor installation shell 5 is mounted on six roots of sensation air delivering pipeline 2, and the broad domain oxygen sensor 6UEGO is natural for real-time measurement acquisition
The λ value of six points of cylinders of gas engine, the λ value refer to excess air coefficient, represent gaseous mixture air and fuel in engine cylinder
Mixed proportion；The broad domain oxygen sensor 6 is between the first solenoid valve 4 and second solenoid valve 7；The lambda sensor mounting shell
Body 5 is embedded in the pipeline Road of air delivering pipeline 2, as shown in figure 4, lambda sensor installation shell 5 is threaded for both ends
Tubular structure, be provided with oxygen sensor mounting hole on one side wall, threaded connection slot, the lambda sensor be provided on another side wall
Shell 5 is installed by the screw thread connection at both ends in the pipeline Road of air delivering pipeline 2, broad domain oxygen sensor 6 is installed on lambda sensor
At mounting hole, the fixation for being threadedly coupled slot for lambda sensor installation shell 5.The signal of the broad domain oxygen sensor 6 is defeated
Outlet is connected with the signal input part of portable air-fuel ratio analyzer 11 respectively, and broad domain oxygen sensor 6 is dense by the oxygen measured
Degree signal is transmitted to portable air-fuel ratio analyzer 11.
The signal input part of the ECU12 is analyzed with the signal output end of signal pickup assembly and portable air-fuel ratio respectively
The signal output end signal of instrument 11 connects, the signal output end of the ECU12 and the signal input part communication connection of host 15.
As shown in Fig. 2, the ECU12 obtains crankshaft sensor 13 and camshaft-signal sensor 14 and broad domain oxygen sensor 6
The signal data measured；The ECU12 sends signal instruction to each solenoid valve, controls each solenoid valve and is opened or closed；
Communication connection between ECU12 and host 15, host 15 record and show the shape of data, solenoid valve that broad domain oxygen sensor 6 measures
The signal phase of state and crankshaft and camshaft.
The ECU specially designed and developed is applied in technical solution of the present invention, the ECU12 is used in hardware components
XC2785 monolithic machine platform, and fully consider Electro Magnetic Compatibility, use 4 layer circuit boards, compatible magnetoelectricity/Hall revolving speed passes
Sensor, 10 road AD0-5V, 2 tunnel high-speed CANs, 12 road intelligent diagnostics driving circuits, 48 core automotive grade dedicated connectors；It is described
ECU12 can carry out engine speed judgement and engine according to crankshaft sensor 13 and camshaft-signal sensor 14 in software aspects
Time reference judgement；The ECU12 is determined by receiving crankshaft sensor 13 and the collected signal of camshaft-signal sensor 14
The timed relationship of engine, to be opened or closed while the first solenoid valve 4 of control and second solenoid valve 7；Portable air-fuel
The oxygen concentration signal received broad domain oxygen sensor 6 measured than analyzer 11 then with analog output to ECU12,
ECU12 will collect the signals such as timed relationship, λ value finally by CAN protocol and be uploaded to host 15, just complete to natural in this way
Gas engine divides the measurement, acquisition and record of the concentration of cylinder gaseous mixture.
In conjunction with above-mentioned measuring system, the present invention also provides a kind of natural gas engines to divide cylinder mixture strength measurement side
Method, the method are specific as follows:
As shown in Figure 1, determining gas transmission by simulation calculation and test first in a certain engine combustion and performance development
Exact position and direction of the air inlet of pipeline 2 in exhaust manifold 1, be in this way in order to guarantee that each cylinder takes the smooth of gas air-flow,
And reduce collaborating between each cylinder；In addition it is also necessary to determine that the first solenoid valve 4, second solenoid valve 7 and lambda sensor install shell
5 exact position is to guarantee that the exhaust of a certain cylinder exhaust cycle can accurately arrive at width by air delivering pipeline 2 in this way
In the measurement space of domain oxygen sensor 6.
During test measurement, measuring system of the invention can be started by the ECU12 specially designed and developed to acquire
The signal of machine crankshaft sensor 13 and camshaft-signal sensor 14, and then determine the timing of engine；In a certain cylinder exhaust stroke
The first solenoid valve 4 and second solenoid valve 7 for controlling respective tube road open or close simultaneously；And it is analyzed using portable air-fuel ratio
Oxygen concentration value measured by the analysis in real time of instrument 11, acquisition broad domain oxygen sensor 6；It communicates, uploads finally by with host 15
Related data has thus reached measurement, display and record to a certain cylinder mixture strength；Igniting further according to engine is suitable
Sequence successively automatically measures other cylinder mixture strengths.
Claims (8)
1. a kind of natural gas engine divides cylinder mixture strength measuring system, it is characterised in that:
The measuring system is by taking air pipe, signal pickup assembly, measuring device, ECU and host to form；
It is described to take air pipe by enmgine exhaust (1), air delivering pipeline (2), jointing (3), the first solenoid valve (4),
Two solenoid valves (7), tailpipe (8) and whirlpool heel row tracheae (10) composition；The inlet end of the air delivering pipeline (2) put in respectively to
Enmgine exhaust (1) is respectively in charge of in interface, and the inlet end of air delivering pipeline (2) is fixed on exhaust manifold (1)；Air delivering pipeline
(2) other end connection to tailpipe (8) air inlet, the whirlpool heel row tracheae (10) be connected to tailpipe (8) go out
Port；First solenoid valve (4) and second solenoid valve (7) are separately mounted to the both ends of air delivering pipeline (2)；
The signal pickup assembly is made of crankshaft sensor (13) and camshaft-signal sensor (14)；Crankshaft sensor (13) and convex
Axle sensor (14) is connect with ECU (12) signal respectively；
The measuring device is made of broad domain oxygen sensor (6) and portable air-fuel ratio analyzer (11), the wide area oxygen sensing
Device (6) is separately mounted on air delivering pipeline (2), the excess air coefficient for real-time measurement acquisition each cylinder of natural gas engine；
The broad domain oxygen sensor (6) connect with portable air-fuel ratio analyzer (11) signal respectively, and broad domain oxygen sensor (6) will be surveyed
The data signal transmission measured is to portable air-fuel ratio analyzer (11)；
The signal output end of the ECU (12) and the signal input part communication connection of host (15).
2. a kind of natural gas engine divides cylinder mixture strength measuring system as described in claim 1, it is characterised in that:
First solenoid valve (4) and second solenoid valve (7) are all made of 600 degree of normal-closed electromagnetic valves of DN10 high temperature, the electromagnetism
Valve is switch electromagnetic valve, and response time 500ms, driving voltage 24V, driving current, can be 600 degree of high temperature resistant less than 2A, pressure
0.3~1.0MPa of power range.
3. a kind of natural gas engine divides cylinder mixture strength measuring system as described in claim 1, it is characterised in that:
The second solenoid valve (7) and tailpipe (8) are installed on fixed plate (9), are provided on the fixed plate (9)
Mounting groove is machined with mounting hole in mounting groove, and the second solenoid valve (7) and tailpipe (8) are loaded in mounting groove, and are led to
Bolt fastener is crossed to be fixed on fixed plate (9).
4. a kind of natural gas engine divides cylinder mixture strength measuring system as claimed in claim 3, it is characterised in that:
The tailpipe (8) is top closed, bottom opening pipe structure, is provided with threaded connection on tailpipe (8) side wall
Hole, the outlet side of air delivering pipeline (2) by the threaded connection hole and tailpipe (8) inner cavity connection, tailpipe (8) with
Threaded connection slot is provided on the side of fixed plate (9) connection, the bottom of tailpipe (8) and whirlpool heel row tracheae (10) screw thread connect
It connects.
5. a kind of natural gas engine divides cylinder mixture strength measuring system as described in claim 1, it is characterised in that:
The crankshaft sensor (13) and camshaft-signal sensor (14) are that can be compatible with the two kinds of sensing of magnetoelectricity/Hall simultaneously
Device.
6. a kind of natural gas engine divides cylinder mixture strength measuring system as described in claim 1, it is characterised in that:
The broad domain oxygen sensor (6) is mounted on air delivering pipeline (2) by lambda sensor installation shell (5), the oxygen sensing
Device installation shell (5) is the tubular structure that both ends are threaded, and is provided with oxygen sensor mounting hole, another side wall on one side wall
On be provided with threaded connection slot, pipeline of lambda sensor installation shell (5) by the screw thread connection at both ends in air delivering pipeline (2)
Road, broad domain oxygen sensor (6) are installed at the oxygen sensor mounting hole of lambda sensor installation shell (5) side, lambda sensor
Fixation of the threaded connection slot of shell (5) other side for lambda sensor installation shell (5) is installed.
7. a kind of natural gas engine divides cylinder mixture strength measuring system as described in claim 1, it is characterised in that:
A broad domain oxygen sensor (6) is also equipped in the lower part of the tailpipe (8).
8. a kind of natural gas engine divides the measurement method of cylinder mixture strength measuring system, feature as claimed in claim 6
It is:
Detailed process is as follows:
One, position and side of the air inlet of air delivering pipeline (2) in exhaust manifold (1) are determined by simulation calculation and test first
To, determine the first solenoid valve (4), second solenoid valve (7) and lambda sensor installation shell (5) exact position；
Two, the signal of engine crankshaft sensor (13) and camshaft-signal sensor (14) is acquired by ECU (12), determination is started
The timing of machine；
Three, the first solenoid valve (4) and second solenoid valve (7) on respective tube road are controlled in an engine wherein cylinder exhaust stroke
It opens or closes simultaneously, and measured using portable air-fuel ratio analyzer (11) analysis in real time, acquisition broad domain oxygen sensor (6)
The excess air coefficient arrived；
Four, it is communicated finally by with host (15), uploads corresponding data, that is, realized the measurement to a certain cylinder mixture strength, show
Show and records.
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