CN108680361A - The test device and test method and alarm diagnosis method of a kind of engine emission - Google Patents
The test device and test method and alarm diagnosis method of a kind of engine emission Download PDFInfo
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- CN108680361A CN108680361A CN201810498291.XA CN201810498291A CN108680361A CN 108680361 A CN108680361 A CN 108680361A CN 201810498291 A CN201810498291 A CN 201810498291A CN 108680361 A CN108680361 A CN 108680361A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
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Abstract
The present invention relates to a kind of test devices of engine emission, including：Command unit；Control unit is electrically connected with command unit；It is characterized in that further including：Emission analyzer；Gas collecting tube is connect by pipeline with emission analyzer, and is connect with one end of sampling gas circuit component；The other end of sampling gas circuit component connect with exhaust pipe component through control valve and communicates, and temperature sensing part is equipped in the outlet of control valve；Exhaust pipe component is communicated with the connection of each cylinder of test engine；Control valve and temperature sensing part are electrically connected with control unit.A kind of test method and alarm diagnosis method of engine emission are also provided.The present invention can carry out fast and automatically handover measurement to the raw emissions of each cylinder exhaust manifold and exhaust main, it can effectively solve the problem that the problem that must stop engine when switching discharge measuring point in front platform emission test and body and exhaust pipe is waited for cool down, and ensure the integrality of engine raw emissions measurement result, improve the accuracy of test result.
Description
Technical field
The present invention relates to automobile engines, and in particular to the device and test method of a kind of test of engine emission and alarm
The device and test method and alarm method that diagnostic method, especially test engine discharge under operation.
Background technology
What in December, 2016 had formally been issued《Light-duty vehicle pollutant emission limit and measurement method (Chinese 6th rank
Section)》.Major Automobile Enterprises face the project of product draining technology upgrading and innovation to meet novel discharge regulation.And it is
The requirement for meeting energy-saving and emission-reduction, optimizes the raw emissions of engine, evaluates the emission level of a engine, need by more
Dimension removes the raw emissions of test engine.If hot each cylinder discharge uniformity of test engine is exactly a dimension therein
Degree.The test method of the hot each cylinder discharge uniformity of engine is：Under identical operating mode, difference each independent gas of test engine
The gas emissions of cylinder exhaust manifold and exhaust main.This method test result can not only reflect that each cylinder discharge of engine is uniform
Property, additionally it is possible to it is directly linked with in-cylinder combustion state, to be to analyze the Emission Optimization side from engine in-cylinder combustion essence
To providing effective way.But in current each test mechanism and enterprise when carrying out this experiment, generally use is manually cut
Change sampling gas circuit.For the sake of testing crew safety, when carrying out gas circuit switching in this way, need that engine is made to shut down simultaneously
It can be carried out after waiting for exhaust pipe suitably cooling, test efficiency certainly will be caused to be greatly reduced in this way.
CN 106546550A disclose " a kind of the practical riving condition of vehicle under tail gas discharge measuring device ", including tail gas
Collecting unit, exhaust gas composition analytic unit, vehicle working condition detection unit and data processing unit；Tail gas collecting unit is for adopting
Collect the tail gas that the vehicle discharges under practical riving condition, exhaust gas composition analytic unit according to tail gas for being analyzed, really
Determine the component information for the tail gas that vehicle discharges under practical riving condition, vehicle working condition detection unit is for determining vehicle in reality
Work information under riving condition, data processing unit are used to be determined according to the component information of tail gas and the work information of vehicle
Vehicle tail gas discharge measuring information under practical riving condition, the apparatus structure is simple, easy to carry, average weight, applicable
In the emission test of various vehicles, and for the high certainty of measurement of gaseous pollutant and particulate matter, the response time is fast, obtains data
Accurately, measurement process is easy, can provide foundation for whether vehicle discharge reaches discharge standard.Not accommodating to doubt, this is affiliated technology
A kind of good try in field.
Invention content
The object of the present invention is to provide a kind of test devices of engine emission, can be to each cylinder exhaust manifold and exhaust
The raw emissions of manifold carry out fast and automatically handover measurement, can effectively solve the problem that when switching discharge is surveyed in front platform emission test
The problem that must stop engine when amount point and body and exhaust pipe is waited for cool down, to significantly improve engine pedestal emission test
Efficiency, and ensure the integrality of engine raw emissions measurement result, improve the consistency of operating condition of test and the standard of test result
True property.The present invention also provides a kind of test methods of engine emission and alarm diagnosis method.
A kind of test device of engine emission of the present invention, including：
Command unit；
Control unit is electrically connected with command unit；
It is characterized in that further including：
Emission analyzer；
Gas collecting tube is connect by pipeline with emission analyzer, and is connect with one end of sampling gas circuit component；The sampling
The other end of gas circuit component connect with exhaust pipe component through control valve and communicates, and temperature sensing part is equipped in the outlet of control valve；Institute
Exhaust pipe component is stated to communicate with the connection of each cylinder of test engine；The control valve and temperature sensing part are electrically connected with control unit
It connects.
Further, the sampling gas circuit component includes that the exhaust main sampling gas communicated is connect with the exhaust main of engine
Road connect the first exhaust menifold sampling gas circuit communicated, the with test engine with the first exhaust menifold of test engine
Second exhaust menifold sampling gas circuit that the connection of two discharge manifolds communicates connect with the third discharge manifold of test engine and to communicate
Third discharge manifold samples gas circuit and connect the 4th discharge manifold sampling gas communicated with the 4th discharge manifold of test engine
Road；One end of the first exhaust menifold is communicated with the connection of the first cylinder of test engine, and the one of the second exhaust menifold
End is connect with the second cylinder of test engine to be communicated, one end of the third discharge manifold and the third cylinder of test engine
Connection communicates, and one end of the 4th discharge manifold is communicated with the connection of the 4th cylinder of test engine；The first exhaust qi
Pipe, second exhaust menifold, the third discharge manifold and the 4th discharge manifold the other end connect communicate with exhaust main respectively.
Further, the control valve includes the high-temperature solenoid valve being located in the exhaust main sampling gas circuit, is located at first
Discharge manifold sampling gas circuit in the first high-temperature solenoid valve, be located at second exhaust menifold sampling gas circuit in the second high-temperature electromagnetic
Valve, the third high temperature solenoid valve being located in third discharge manifold sampling gas circuit and be located in the 4th discharge manifold sampling gas circuit the
Four high-temperature solenoid valves.
Further, the temperature sensing part includes the temperature sensor for being located at the high-temperature solenoid valve exit, is located at institute
It states first temperature sensor in the first high-temperature solenoid valve exit, be located at the second temperature in second high-temperature solenoid valve exit
It sensor, the third temperature sensor being located at the third high temperature electromagnetic valve outlet and is located at the 4th high-temperature solenoid valve and goes out
The 4th temperature sensor at mouthful.
High-temperature solenoid valve and temperature sensor described further, the first high-temperature solenoid valve and the first temperature sensor, second
High-temperature solenoid valve and second temperature sensor, third high temperature solenoid valve and third temperature sensor and the 4th high-temperature solenoid valve and
Four temperature sensors are electrically connected with described control unit respectively.
Further, using TCP/IP, serial ports or USB communication connections between described instruction unit and control unit.
A kind of test method of engine emission of the present invention, using the engine emission test device into
Row, when original state, all control valves are in closed state, are tested after normal working of engine to be tested, including
Following steps：
The first step selects emission test switch mode by command unit：Mould is automatically switched in manual switching pattern or timing
Formula；
Second step then directly transmits destination sample gas circuit by command unit and refers to when first step selection manual switching pattern
It enables to control unit；
When the first step selects timing automatic switchover mode, then need first to be arranged multiple destination sample gas circuits, transfer sequence and
Timing length, and setting result is sent to control unit by command unit；
Third walks, manual switching pattern；Control unit receive destination sample gas circuit instruction after, with corresponding control channel to
The high-temperature solenoid valve of destination sample gas circuit sends out drive signal, and high-temperature solenoid valve is made to open, destination sample gas circuit exhaust gas flow
Enter gas collecting tube, and be discharged into analyzer measurement, after the completion of experiment, control unit is sent a command to by command unit, is closed
High-temperature solenoid valve；
4th step, timing automatic switchover mode；After control unit receives the information of command unit transmission, according to setting
Transfer sequence, drive signal is sent out to the high-temperature solenoid valve of destination sample gas circuit with corresponding control channel successively, is cut each time
The time interval for changing control channel is timing length, the destination sample gas circuit discharge gas inflow gas collecting tube switched every time, and by
It is discharged into analyzer measurement, and shows test result, after the completion of experiment, all high-temperature solenoid valves are automatically closed.
A kind of alarm diagnosis method of engine emission of the present invention, in carrying out discharge gas sampling process, institute
Steps are as follows for the test device feedback high-temperature solenoid valve detection alarm diagnosis for the engine emission stated：
Step A. control units acquire the temperature signal under each sampling gas circuit high-temperature electromagnetic valve closing state in real time, and to institute
There is sampling gas path temperature value that average value T is calculatedavg_no；
Step B. by each sampling gas path temperature value acquired in step A peak Tmax_noWith average value Tavg_noRatio
As judgment threshold calibration coefficient β；
During step C. actual tests, after the high-temperature solenoid valve for judging each non-targeted sampling gas circuit respectively, observed temperature
Ti_noWhether temperature threshold β × T is higher thanavg_no；
Judge in step D. steps C, if Ti_no＞ β × Tavg_no, then the non-targeted sampling gas circuit high-temperature solenoid valve discharge gas
Body is not completely cut through, and control unit is shown on a display screen to command unit feedback alarm information, command unit；If Ti_no
≤β×Tavg_no, then the non-targeted sampling gas circuit high-temperature solenoid valve discharge gas have been turned off, control unit without operation, instruction
Not display alarm information on the display screen of unit.
The present invention is switched fast the sampling for needing to measure by changing each break-make for sampling gas circuit and gas collecting tube connecting line
Gas circuit.Each sampling gas circuit is connect with each cylinder exhaust manifold of engine and exhaust main, is then collected to gas collecting tube, then by gas collection
Pipe is connected with emission analyzer sample gas acquisition entrance, conveniently the discharge capacity of each cylinder of test engine and exhaust main.Its
In, each break-make for sampling gas circuit and gas collecting tube is by the open and close control of high-temperature solenoid valve, and the signal of high-temperature solenoid valve is by control list
Member is sent out, and testing crew is sent to control unit by the control interface of operating mode computer and instructed；Each high-temperature solenoid valve exit
It is respectively mounted temperature sensor, is fed back by temperature signal and realizes that the high-temperature solenoid valve to each sampling gas circuit is leaked and alarmed, in time
Discharge measuring is avoided to be distorted.
The present invention can be used manually and the automatic two different modes of timing are switched fast destination sample pipeline.Effectively solve
Can not be shut down in current rack emission testing carry out discharge sampling gas circuit switching cause rack emission testing carry out efficiency compared with
Low problem discharges the development experiments period to effectively shorten engine product, while testing crew also greatly improved
Safe operation guarantee.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the solenoid valve control signal figure of present device；
Fig. 3 is the temperature feedback signal diagnostic graph of present device；
Fig. 4 is the software flow pattern of command unit.
In figure：1-test engine, the 11-the first cylinder, the 12-the second cylinder, 13-third cylinders, the 14-the four gas
Cylinder；
20-exhaust main exhaust manifolds, 21-first exhaust manifolds, 22-second exhaust manifolds, 23-thirds are vented discrimination
Pipe, the 24-the four exhaust manifold；
30-exhaust mains sample gas circuit, and 31-first exhaust menifolds sample gas circuit, and 32-second exhaust menifolds sample gas
Road, 33-third discharge manifolds sample gas circuit, and the 34-the four discharge manifold samples gas circuit；
40-high-temperature solenoid valves；41-the first high-temperature solenoid valve, the 42-the second high-temperature solenoid valve, 43-third high temperature electromagnetism
Valve, the 44-the four high-temperature solenoid valve；
50-temperature sensors, the 51-the first temperature sensor, 52-second temperature sensors, 53-third temperature sensing
Device, the 54-the four temperature sensor；
6-gas collecting tubes；7-emission analyzers；8-control units；9-command units.
Specific implementation mode
In conjunction with attached drawing, invention is further explained.
Referring to Fig. 1 and Fig. 2, the test device of a kind of engine emission, including：
Command unit 9；
Control unit 8 is electrically connected with command unit 9；
It is characterized in that further including：
Emission analyzer 7；
Gas collecting tube 6 is connect by pipeline with emission analyzer 7, and is connect with one end of sampling gas circuit component；It is described to adopt
The other end of sample gas circuit component connect with exhaust pipe component through control valve and communicates, and temperature sensing part is equipped in the outlet of control valve；
The exhaust pipe component is connect with each cylinder of test engine 1 to be communicated；The control valve and temperature sensing part and control unit 8
Electrical connection.
The sampling gas circuit component includes that the exhaust main sampling gas communicated is connect with the exhaust main of test engine 20
Road 30 connect the first exhaust menifold sampling gas circuit 31 communicated with the first exhaust menifold 21 of test engine, starts with test
The second exhaust menifold 22 of machine connects the second exhaust menifold sampling gas circuit 32 communicated, the third discharge manifold with test engine
The third discharge manifold sampling gas circuit 33 and being connect with the 4th discharge manifold 24 of test engine that 23 connections communicate communicate the
Four discharge manifolds sample gas circuit 34；One end of the first exhaust menifold 21 and the first cylinder 11 of test engine connect phase
Logical, one end of the second exhaust menifold 22 is communicated with the connection of the second cylinder 12 of test engine, the third discharge manifold
23 one end is communicated with the connection of the third cylinder 13 of test engine, and one end of the 4th discharge manifold 24 is started with test
The 4th cylinder 14 connection of machine communicates；The first exhaust menifold 21, second exhaust menifold 22, the third discharge manifold 23
It connect and communicates with exhaust main 20 respectively with the other end of the 4th discharge manifold 24.
The control valve includes the high-temperature solenoid valve 40 being located in the exhaust main sampling gas circuit 30, is located at first exhaust
Menifold sampling gas circuit 31 in the first high-temperature solenoid valve 41, be located at second exhaust menifold sampling gas circuit 32 in the second high-temperature electromagnetic
Valve 42, be located at third discharge manifold sampling gas circuit 33 in third high temperature solenoid valve 43 and be located at the 4th discharge manifold sampling gas
The 4th high-temperature solenoid valve 44 in road 34.
The temperature sensing part includes the temperature sensor 50 for being located at 40 exit of the high-temperature solenoid valve, is located at described
First temperature sensor 51 in one high-temperature solenoid valve, 41 exit, the second temperature for being located at 42 exit of the second high-temperature solenoid valve
Degree sensor 52 is located at the third temperature sensor 53 in 43 exit of third high temperature solenoid valve and is located at the 4th high temperature
4th temperature sensor 54 in 44 exit of solenoid valve.
The high-temperature solenoid valve 40 and temperature sensor 50, the first high-temperature solenoid valve 41 and the first temperature sensor 51,
Two high-temperature solenoid valves 42 and second temperature sensor 52, third high temperature solenoid valve 43 and third temperature sensor 53 and the 4th high temperature
Solenoid valve 44 and the 4th temperature sensor 54 are electrically connected with described control unit 8 respectively.
Using TCP/IP, serial ports or USB communication connections between described instruction unit 9 and control unit 8.
A kind of test method of engine emission of the present invention, using the engine emission test device into
Row, when original state, all control valves are in closed state, are tested after normal working of engine to be tested, including
Following steps：
The first step selects emission test switch mode by command unit 9：Mould is automatically switched in manual switching pattern or timing
Formula；
Second step then directly transmits destination sample gas circuit by command unit 9 and refers to when first step selection manual switching pattern
It enables to control unit 8；
When the first step selects timing automatic switchover mode, then need first to be arranged multiple destination sample gas circuits, transfer sequence and
Timing length, and setting result is sent to control unit 8 by command unit 9；
Third walks, manual switching pattern；After control unit 8 receives the instruction of destination sample gas circuit, with corresponding control channel
Drive signal is sent out to the high-temperature solenoid valve of destination sample gas circuit, high-temperature solenoid valve is made to open, destination sample gas circuit discharge gas
Gas collecting tube 6 is flowed into, and is discharged into the measurement of analyzer 7, after the completion of experiment, control unit is sent a command to by command unit 9
8, close high-temperature solenoid valve；
4th step, timing automatic switchover mode；After control unit 8 receives the information of the transmission of command unit 9, according to setting
The transfer sequence set sends out drive signal, each time with corresponding control channel to the high-temperature solenoid valve of destination sample gas circuit successively
The time interval in switching control channel is timing length, and the destination sample gas circuit discharge gas switched every time flows into gas collecting tube 6, and
It is discharged into the measurement of analyzer 7, and shows test result, after the completion of experiment, all high-temperature solenoid valves are automatically closed.
Referring to Fig. 1, Fig. 2 and Fig. 3, a kind of alarm diagnosis method of engine emission of the present invention is being discharged
In gas sampling process, steps are as follows for the test device feedback high-temperature solenoid valve detection alarm diagnosis of the engine emission：
Step A. control units 8 acquire the temperature signal under each sampling gas circuit high-temperature electromagnetic valve closing state in real time, and right
Average value T is calculated in all sampling gas path temperature valuesavg_no；
Step B. by each sampling gas path temperature value acquired in step A peak Tmax_noWith average value Tavg_noRatio
As judgment threshold calibration coefficient β；
During step C. actual tests, after the high-temperature solenoid valve for judging each non-targeted sampling gas circuit respectively, observed temperature
Ti_noWhether temperature threshold β × T is higher thanavg_no；
Judge in step D. steps C, if Ti_no＞ β × Tavg_no, then the non-targeted sampling gas circuit high-temperature solenoid valve discharge gas
Body is not completely cut through, and control unit 8 is shown on a display screen to 9 feedback alarm information of command unit, command unit 9；If
Ti_no≤β×Tavg_no, then the non-targeted sampling gas circuit high-temperature solenoid valve discharge gas have been turned off, control unit 8 without behaviour
Make, not display alarm information on the display screen of command unit 9.
30-exhaust mains sample gas circuit, and 31-first exhaust menifolds sample gas circuit, and 32-second exhaust menifolds sample gas
Road, 33-third discharge manifolds sample gas circuit, and the 34-the four discharge manifold samples gas circuit
Destination sample gas circuit, that is, current emissions analyzer samples gas circuit, and the gas of such as the first cylinder of current test discharges, that
It is destination sample gas circuit that first exhaust menifold, which samples gas circuit,；Non-targeted sampling gas circuit, that is, current emissions analyzer does not sample gas
Road, the gas discharge of such as the first cylinder of current test, then second exhaust menifold sampling gas circuit, third discharge manifold sample gas
Road, the 4th discharge manifold sampling gas circuit, exhaust main sampling gas circuit are non-targeted sampling gas circuit.4X in Fig. 2 adopts for target
Solenoid valve corresponding to sample gas circuit.5X in Fig. 3 is the temperature sensor corresponding to destination sample gas circuit.
The exhaust manifold is installed on the exhaust side of test engine, and the quantity for sampling gas circuit is test engine number of cylinders
Amount+1, and its end A is used with each cylinder exhaust manifold and exhaust main be threadedly coupled respectively.The ends B of sampling gas circuit are connected to
Gas collecting tube.High-temperature solenoid valve quantity is identical as sampling gas circuit quantity, is installed in series in each sampling gas circuit.The control of high-temperature solenoid valve
End processed is connect with control unit.Temperature sensor close installation is in high-temperature solenoid valve outlet port (the B extreme directions of sampling gas circuit).
Temperature sensor signal line accesses control unit.Temperature signal feedback alarm is shown in the display screen of command unit.
The ends sampling gas circuit (multichannel) A are summarized node with exhaust manifold and exhaust manifold respectively and are connect, and the ends B are all connected with
To gas collecting tube, gas collecting tube outlet is connect with emission analyzer sampling probe.Each channel sample gas circuit is respectively mounted high-temperature solenoid valve,
The opening and closing of high-temperature solenoid valve is controlled with control unit by command unit, gas path on-off is sampled with control targe.Control
Unit can meet the control of high-temperature solenoid valve to adjust manually simultaneously to be automatically adjusted with timing.Temperature sensor close installation is in height
Warm electromagnetic valve outlet position, temperature feedback signal access control unit, for non-targeted sampling gas circuit high-temperature solenoid valve leak or
Failure detection is alarmed, and prompts testing crew emission result to measure distortion, in time adjustment or termination test.
Claims (8)
1. a kind of test device of engine emission, including：
Command unit (9)；
Control unit (8) is electrically connected with command unit (9)；
It is characterized in that further including：
Emission analyzer (7)；
Gas collecting tube (6) is connect by pipeline with emission analyzer (7), and is connect with one end of sampling gas circuit component；It is described to adopt
The other end of sample gas circuit component connect with exhaust pipe component through control valve and communicates, and temperature sensing part is equipped in the outlet of control valve；
The exhaust pipe component is connect with each cylinder of test engine (1) to be communicated；The control valve and temperature sensing part and control are single
First (8) electrical connection.
2. the test device of engine emission according to claim 1, it is characterized in that：The sampling gas circuit component include with
The first exhaust menifold for the exhaust main sampling gas circuit (30) and test engine that exhaust main (20) connection of engine communicates
(21) connection communicates first exhaust menifold sampling gas circuit (31) connect with the second exhaust menifold (22) of test engine and communicates
Second exhaust menifold sampling gas circuit (32), connect the third that communicates with the third discharge manifold (23) of test engine and be vented qi
Pipe samples gas circuit (33) and connect the 4th discharge manifold sampling gas circuit communicated with the 4th discharge manifold (24) of test engine
(34)；One end of the first exhaust menifold (21) is communicated with the connection of the first cylinder (11) of test engine, the second row
One end of gas menifold (22) is communicated with the connection of the second cylinder (12) of test engine, one end of the third discharge manifold (23)
It connect and communicates with the third cylinder (13) of test engine, one end of the 4th discharge manifold (24) and the of test engine
Four cylinders (14) connection communicates；The first exhaust menifold (21), second exhaust menifold (22), the third discharge manifold (23)
It connect and communicates with exhaust main (20) respectively with the other end of the 4th discharge manifold (24).
3. the test device of engine emission according to claim 1 or 2, it is characterized in that：The control valve includes being located at
High-temperature solenoid valve (40) in exhaust main sampling gas circuit (30), the be located in first exhaust menifold sampling gas circuit (31)
One high-temperature solenoid valve (41), is located at third at the second high-temperature solenoid valve (42) being located in second exhaust menifold sampling gas circuit (32)
Discharge manifold samples the third high temperature solenoid valve (43) in gas circuit (33) and is located in the 4th discharge manifold sampling gas circuit (34)
4th high-temperature solenoid valve (44).
4. the test device of engine emission according to claim 3, it is characterized in that：The temperature sensing part includes being located at
The temperature sensor (50) in high-temperature solenoid valve (40) exit, be located at the first high-temperature solenoid valve (41) exit
One temperature sensor (51), is located at institute at the second temperature sensor (52) for being located at the second high-temperature solenoid valve (42) exit
It states the third temperature sensor (53) in third high temperature solenoid valve (43) exit and is located at the 4th high-temperature solenoid valve (44)
The 4th temperature sensor (54) at mouthful.
5. the test device of engine emission according to claim 4, it is characterized in that：The high-temperature solenoid valve (40) and temperature
Spend sensor (50), the first high-temperature solenoid valve (41) and the first temperature sensor (51), the second high-temperature solenoid valve (42) and second
Temperature sensor (52), third high temperature solenoid valve (43) and third temperature sensor (53) and the 4th high-temperature solenoid valve (44) and
Four temperature sensors (54) are electrically connected with described control unit (8) respectively.
6. the test device of engine emission according to claim 1 or 2, it is characterized in that：Described instruction unit (9) and control
Using TCP/IP, serial ports or USB communication connections between unit (8) processed.
7. a kind of test method of engine emission, carried out using the test device of the engine emission, when original state,
All control valves are in closed state, are tested, are included the following steps after normal working of engine to be tested：
The first step selects emission test switch mode by command unit (9)：Mould is automatically switched in manual switching pattern or timing
Formula；
Second step, when the first step selects manual switching pattern, then directly transmitting destination sample gas circuit by command unit (9) instructs
To control unit (8)；
When first step selection timing automatic switchover mode, then need that multiple destination sample gas circuits, transfer sequence and timing is first arranged
Duration, and setting result is sent to control unit (8) by command unit (9)；
Third walks, manual switching pattern；Control unit (8) receive destination sample gas circuit instruction after, with corresponding control channel to
The high-temperature solenoid valve of destination sample gas circuit sends out drive signal, and high-temperature solenoid valve is made to open, destination sample gas circuit exhaust gas flow
Enter gas collecting tube (6), and be discharged into analyzer (7) measurement, after the completion of experiment, control is sent a command to by command unit (9)
Unit (8) closes high-temperature solenoid valve；
4th step, timing automatic switchover mode；After control unit (8) receives the information of command unit (9) transmission, according to setting
The transfer sequence set sends out drive signal, each time with corresponding control channel to the high-temperature solenoid valve of destination sample gas circuit successively
The time interval in switching control channel is timing length, and the destination sample gas circuit discharge gas switched every time flows into gas collecting tube (6),
And it is discharged into analyzer (7) measurement, and show test result, after the completion of experiment, all high-temperature solenoid valves are automatically closed.
8. a kind of alarm diagnosis method of engine emission, in carrying out discharge gas sampling process, the engine emission
Test device feedback high-temperature solenoid valve detection alarm diagnosis steps are as follows：
Step A. control units (8) acquire the temperature signal under each sampling gas circuit high-temperature electromagnetic valve closing state in real time, and to institute
There is sampling gas path temperature value that average value T is calculatedavg_no；
Step B. by each sampling gas path temperature value acquired in step A peak Tmax_noWith average value Tavg_noRatio conduct
Judgment threshold calibration coefficient β；
During step C. actual tests, after the high-temperature solenoid valve for judging each non-targeted sampling gas circuit respectively, observed temperature Ti_noIt is
It is no to be higher than temperature threshold β × Tavg_no；
Judge in step D. steps C, if Ti_no＞ β × Tavg_no, then the non-targeted sampling gas circuit high-temperature solenoid valve discharge gas is not
It completely cuts through, control unit (8) is shown on a display screen to command unit (9) feedback alarm information, command unit (9)；
If Ti_no≤β×Tavg_no, then the non-targeted sampling gas circuit high-temperature solenoid valve discharge gas have been turned off, control unit (8) without
Operation, not display alarm information on the display screen of command unit (9).
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| CN110608890A (en) * | 2019-08-05 | 2019-12-24 | 济南天业工程机械有限公司 | Engineering machine tool discharges test system |
| CN111413101A (en) * | 2020-04-02 | 2020-07-14 | 无锡市海龙机械有限公司 | Engine exhaust emission detection device and working method thereof |
| CN112799371A (en) * | 2019-11-13 | 2021-05-14 | 北京福田康明斯发动机有限公司 | Control system and control method of engine particle number emission measuring device |
| CN113125160A (en) * | 2019-12-30 | 2021-07-16 | 郑州宇通客车股份有限公司 | New energy vehicle emission detection device, emission test system and emission detection method |
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| CN110608890A (en) * | 2019-08-05 | 2019-12-24 | 济南天业工程机械有限公司 | Engineering machine tool discharges test system |
| CN112799371A (en) * | 2019-11-13 | 2021-05-14 | 北京福田康明斯发动机有限公司 | Control system and control method of engine particle number emission measuring device |
| CN112799371B (en) * | 2019-11-13 | 2022-05-13 | 北京福田康明斯发动机有限公司 | Control system and control method of engine particle number emission measuring device |
| CN113125160A (en) * | 2019-12-30 | 2021-07-16 | 郑州宇通客车股份有限公司 | New energy vehicle emission detection device, emission test system and emission detection method |
| CN113125160B (en) * | 2019-12-30 | 2023-08-18 | 宇通客车股份有限公司 | New energy vehicle emission detection device, emission test system and emission detection method |
| CN111413101A (en) * | 2020-04-02 | 2020-07-14 | 无锡市海龙机械有限公司 | Engine exhaust emission detection device and working method thereof |
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