CN108489732A - Engine transient emission test analysis system and method - Google Patents
Engine transient emission test analysis system and method Download PDFInfo
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- CN108489732A CN108489732A CN201810201343.2A CN201810201343A CN108489732A CN 108489732 A CN108489732 A CN 108489732A CN 201810201343 A CN201810201343 A CN 201810201343A CN 108489732 A CN108489732 A CN 108489732A
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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
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
Abstract
The invention discloses a kind of engine transient emission test analysis system and methods, including exhaust apparatus, drum test pedestal control system, drum test rack, test vehicle, Combustion tester, EFI parameter acquisition unit, data analysis unit, slave computer and cylinder pressure sensor, two probes of exhaust apparatus are mounted respectively to the front and rear sides of the catalyst converter of test vehicle, and exhaust apparatus is connect with drum test pedestal control system；Drum test rack is connect with drum test pedestal control system；Drum test pedestal control system is connect with data analysis unit；Cylinder pressure sensor is separately mounted at each cylinder, and each cylinder pressure sensor is connect with Combustion tester, and Combustion tester is connect with data analysis unit；EFI parameter acquisition unit is connect with vehicle ECU and data analysis unit respectively；Data analysis unit is connect with slave computer.The present invention can directly by emission result under vehicle operating mode and engine combustion result associated measurement and analyze.
Description
Technical field
The invention belongs to automotive test fields, and in particular to a kind of engine transient emission test analysis system and method.
Background technology
With《Light-duty vehicle pollutant emission limit and measurement method (Chinese 6th stage)》Publication, each cart enterprise exists
Huge challenge is faced in terms of the exploitation of vehicle emission performance.Compared to five emission regulation of state, six emission regulation of state is in test loop work
It is adjusted from NEDC test loops for WLTC test loops in terms of condition, it is aobvious to require the performance under vehicle transient condition
It writes and improves.Therefore, enterprise also will more lay particular emphasis on engine and power assembly transient state in carrying out vehicle product development process
The promotion of energy.
When carrying out regulation vehicle emission testing, since emission analyzer sample frequency is relatively low, and engine combustion is analyzed
Frequency is higher, usually can not being directly associated property analyze, deterioration of emission is caused to can not accurately analyze under vehicle operating mode
The reason of, cause the test number (TN) in vehicle discharge exploitation and optimization process to increase, not only increase the development cost of enterprise,
Extend the development cycle of product.
Therefore, in order to realize that the vehicle of the high-efficiency and economic of reply novel discharge regulation discharges exploitation and optimization, there is an urgent need for
A kind of engine transient discharge based on regulation test loop and burning relevance measurement method, for the direct pass discharged and burnt
System's analysis provides technical support.
Invention content
The object of the present invention is to provide a kind of engine transient emission test analysis system and methods, can be directly by vehicle work
It emission result and engine combustion result associated measurement and is analyzed under condition, the direct relation analysis to discharge and burning provides skill
Art supports.
Engine transient emission test analysis system of the present invention, including the control of exhaust apparatus, drum test rack
System, drum test rack, test vehicle, Combustion tester, EFI parameter acquisition unit, data analysis unit, slave computer with
And cylinder pressure sensor,
The two-way sampling channel probe of the exhaust apparatus is mounted respectively to the front and rear sides of the catalyst converter of test vehicle, and
Exhaust apparatus is connect with drum test pedestal control system；
The drum test rack is connect with drum test pedestal control system；
The drum test pedestal control system is connect with data analysis unit, by the test result and rotary drum of exhaust apparatus
The measurement result of test-bed is sent to data analysis unit by drum test pedestal control system；
The quantity of the cylinder pressure sensor is identical as the number of cylinders of engine, is separately mounted at each cylinder, each cylinder pressure
The signal wire of sensor is connect by charge amplifier with Combustion tester, and the Combustion tester connects with data analysis unit
It connects, the data that Combustion tester is exported is inputed into data analysis unit；
The EFI parameter acquisition unit is connect with vehicle ECU and data analysis unit respectively, by EFI parameter acquisition list
The data that member is acquired are sent to data analysis unit；
The data analysis unit is connect with slave computer, and handling result is sent to slave computer and protected by data analysis unit
It deposits.
The data analysis unit includes data processing operation module, and connect respectively with data processing operation module
Physical signal acquisition module, parameter setting module, serial communication module, the first CAN communication module, the second CAN communication module and
TCP/IP communication modules；
The serial communication module is connect with drum test pedestal control system, for receiving exhaust apparatus and drum test
The data that rack is tested；
The first CAN communication module is connect with EFI parameter acquisition unit, defeated for receiving EFI parameter acquisition unit
The data gone out；
The second CAN communication module or TCP/IP communication modules are connect with Combustion tester, for receiving combustion analysis
The data of instrument output；
The physical signal acquisition module controls signal for acquiring combustion physics signal with EFI；
The parameter setting module is for being arranged parameter needed for data processing；
The data processing operation module is used to carry out the data synchronization of multisystem and analysis parameter calculates.
A kind of engine transient emission test analysis method of the present invention, using engine wink as described in the present invention
State emission test analysis system, method include：
A. before the two-way sampling channel of the exhaust apparatus after preheating probe being mounted respectively to the catalyst converter of test vehicle
Both sides afterwards；Each cylinder pressure sensor is mounted respectively to each cylinder of engine, sensor signal lines are passed through into charge amplifier and combustion
Burn analyzer connection；EFI parameter acquisition unit and vehicle ECU are attached；By drum test pedestal control system and data
Analytic unit connects；Combustion tester is connect with data analysis unit；By EFI parameter acquisition unit and data analysis unit
Connection；
B. the trigger collection clock source of setting drum test pedestal control system and EFI parameter acquisition unit is in equipment
Portion's clock, setting Combustion tester trigger collection clock source are crankshaft signal；
C. it operates each equipment and starts test vehicle, vehicle is run according to target vehicle operating mode；
D. stop vehicle after the completion of the operation of vehicle operating mode and close engine, be simultaneously stopped each signal collecting device；
E. data analysis unit completes rotary drum rack measurement result, Combustion tester and EFI parameter acquisition unit
After data transmission, automatically into data synchronization processing link；
F. after the completion of data synchronization processing, handling result is exported and is preserved；
G. instantaneous emission and combustion characteristics correlation analysis are carried out to the data file exported after synchronization process.
Further, in the step F,
Data synchronization processing calculation step includes：
F1. drum test rack and the time shaft in EFI parameter acquisition unit gathered data result and speed are extracted respectively
Data, using vehicle speed data as variable is referred to, the time shaft of drum test rack gathered data is as fiducial time；
F2. the identical work of vehicle speed data characteristic segments is measured by comparing drum test rack and EFI parameter acquisition unit respectively
The time of condition point obtains the time difference △ t of two data collecting systemsi, when EFI parameter acquisition unit compares drum dynamometer
When frame acquisition time shifts to an earlier date, △ ti＜ 0, when EFI parameter acquisition system is lagged compared to drum test rack acquisition time, △ ti
＞ 0；
F3. at least three difference vehicle speed data characteristic segments pair of operation points ratio is chosen, to obtain multiple and different △ ti, EFI
Time after parameter acquisition system synchronizes is：
Wherein：tINCA_SynThe rear time is synchronized for EFI parameter acquisition system；tINCAWhen original for EFI parameter acquisition system
Between；N is gained △ tiQuantity；
F4. respectively extraction complete above-mentioned steps F1 synchronized to step F3 after EFI parameter acquisition unit with it is not yet synchronous
Time shaft measured by Combustion tester and engine speed data, using engine speed data as synchronous reference variable, together
The time shaft of EFI parameter acquisition unit is as fiducial time after step；
F5. it when vehicle start-stop function is closed, is measured with EFI parameter acquisition unit by comparing Combustion tester respectively
The time of the identical operating point of engine speed data characteristic segments obtains the time difference △ t of two data collecting systemsi, work as burning
When analyzer compares the time advance of EFI parameter acquisition unit, △ ti＜ 0, when Combustion tester compares EFI parameter acquisition system
When system time lag, △ ti＞ 0, the Combustion tester data time after synchronizing are：
Wherein：tComb_SynThe rear time is synchronized for EFI parameter acquisition unit；tCombWhen original for EFI parameter acquisition unit
Between；N is gained △ tiQuantity, n >=3；
When vehicle start-stop function is opened, from on-test, shutting down must be turned each time after starting by comparing engine
The identical operating point of fast curvilinear characteristic section, obtains this section of driving cycle and corresponds to time difference △ ti, until off-test；Work as combustion analysis
When instrument compares the time advance of EFI parameter acquisition unit, △ ti＜ 0, when Combustion tester is compared to EFI parameter acquisition unit
When time lag, △ ti＞ 0；1 engine speed graph spy is at least chosen per the driving cycle between start-stop operation twice
Section pair of operation points ratio is levied, determines at least one △ ti, Combustion tester acquisition time segment sync mode is as follows under this condition：
ti_(COmb_Syn)=ti_(Comb)-△ti
tComb_Syn=[t1_(Comb_Syn),t2_(Comb_Syn),…,tn_(Comb_Syn)]
Wherein：ti_(Comb_Syn)To synchronize the rear time per the Combustion tester acquisition between start-stop operation twice；ti_(Comb)For
Original time is acquired per the Combustion tester between start-stop operation twice；tComb_SynIt is complete after being synchronized for Combustion tester acquisition
Time data is the set of segment data；N is gained △ tiQuantity；
F6. discharge measuring data and EFI supplemental characteristic after synchronizing according to Combustion analysis data circular order and follow
The ring time carries out the linear interpolation between each two consecutive number strong point on the time shaft after each motor synchronizing, obtains and combustion analysis
Discharge measuring data after data dimension and the identical synchronization process of data point spacing and EFI supplemental characteristic；
F7. the combustion analysis that will be obtained in the discharge measuring data obtained in step F6, EFI supplemental characteristic and step F5
Data are exported and are preserved.
Further, the step G is specially：It is instantaneous to occurring respectively after obtaining the data of synchronization process according to step F7
Discharge increases the corresponding burn cycle parameter of operating mode and EFI parameter is compared, and combines discharge measuring as a result, to instantaneously arranging
It the reason of putting raising and is analyzed with the relevance of engine combustion.
Beneficial effects of the present invention：It can be directly associated with engine combustion result by emission result under vehicle operating mode
It measures and analyzes, the direct relation analysis to discharge and burning provides technical support.
Description of the drawings
Fig. 1 is present invention test system schematic；
Fig. 2 is measuring process schematic diagram of the present invention；
Fig. 3 is data analysis unit synchronization process step schematic diagram；
Fig. 4 is drum dynamometer rack data schematic diagram synchronous with EFI supplemental characteristic；
Fig. 5 is EFI supplemental characteristic schematic diagram synchronous with burning data (closing of start-stop function)；
Fig. 6 is EFI supplemental characteristic schematic diagram synchronous with burning data (unlatching of start-stop function)；
Fig. 7 is data analysis unit basic function module schematic diagram；
In figure：1, exhaust apparatus, 2, drum test pedestal control system, 3, drum test rack, 4, test vehicle, 5, combustion
Burn analyzer, 6, EFI parameter acquisition unit, 7, data analysis unit, 7a, physical signal acquisition module, 7b, data processing fortune
Calculation module, 7c, parameter setting module, 7d, serial communication module, 7e, the first CAN communication module, 7f, the second CAN communication module,
7g, TCP/IP communication module, 8, slave computer.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
Engine transient emission test analysis system as shown in Figure 1, including the control of exhaust apparatus 1, drum test rack
System 2, drum test rack 3, test vehicle 4, Combustion tester 5, EFI parameter acquisition unit 6, data analysis unit 7, under
Position machine 8 and cylinder pressure sensor 9.Wherein, the two-way sampling channel probe of the exhaust apparatus 1 is mounted respectively to test vehicle 4
Catalyst converter front and rear sides, and exhaust apparatus 1 is connect with drum test pedestal control system 2.The drum test rack 3 with
Drum test pedestal control system 2 connects.The drum test pedestal control system 2 is connect with data analysis unit 7, will be discharged
The test result of equipment 1 and the measurement result of drum test rack 3 are sent to data point by drum test pedestal control system 2
Analyse unit 7.The quantity of the cylinder pressure sensor 9 is identical as the number of cylinders of engine, is separately mounted at each cylinder, each cylinder pressure
The signal wire of sensor is connect by charge amplifier with Combustion tester 5, the Combustion tester 5 and data analysis unit 7
The data that Combustion tester 5 is exported are inputed to data analysis unit 7 by connection.The EFI parameter acquisition unit 6 respectively with
Vehicle ECU and data analysis unit 7 connect, and the data that EFI parameter acquisition unit 6 is acquired are sent to data analysis unit
7.The data analysis unit 7 is connect with slave computer 8, and handling result is sent to slave computer 8 and protected by data analysis unit 7
It deposits.
In the present embodiment, drum test rack is also known as chassis dynamometer, is a kind of shop test equipment.For simulated automotive
Resistance in actual travel measures the performance of automobile and detects the technology status of automobile, diagnoses vehicle failure.
As shown in fig. 7, the data analysis unit 7 include data processing operation module 7b, and respectively with data processing
The physical signal acquisition module 7a of computing module 7b connections, parameter setting module 7c, serial communication module 7d, the first CAN communication
Module 7e, the second CAN communication module 7f and TCP/IP communication module 7g.Wherein, the serial communication module 7d and drum test
Pedestal control system 2 connects, the data tested for receiving exhaust apparatus 1 and drum test rack 3.First CAN is logical
News module 7e is connect with EFI parameter acquisition unit 6, the data for receiving the output of EFI parameter acquisition unit 6.Described second
CAN communication module 7f or TCP/IP communication module 7g is connect with Combustion tester 5, the number for receiving the output of Combustion tester 5
According to.The physical signal acquisition module 7a controls signal for acquiring combustion physics signal with EFI.The parameter setting module
7c is for being arranged parameter needed for data processing.The data processing operation module 7b is used to carry out the data synchronization of multisystem and divides
Parameter is analysed to calculate.
As shown in Fig. 2, engine transient emission test analysis method of the present invention, using hair as described in the present invention
Motivation instantaneous emission detecting and analysing system, method include：
A., the two-way sampling channel of exhaust apparatus 1 after preheating probe is mounted respectively to the catalyst converter of test vehicle 4
Front and rear sides；Each cylinder pressure sensor 9 is mounted respectively to each cylinder of engine, by sensor signal lines by charge amplifier with
Combustion tester 5 connects；EFI parameter acquisition unit 6 and vehicle ECU are attached；By drum test pedestal control system 2
It is connect with data analysis unit 7；Combustion tester 5 is connect with data analysis unit 7；By EFI parameter acquisition unit 6 and number
It is connected according to analytic unit 7.
B. the trigger collection clock source of setting drum test pedestal control system 2 and EFI parameter acquisition unit 6 is equipment
Internal clocking, setting 5 trigger collection clock source of Combustion tester are crankshaft signal.
C. it operates each equipment and starts test vehicle, vehicle is run according to target vehicle operating mode.
D. stop vehicle after the completion of the operation of vehicle operating mode and close engine, be simultaneously stopped each signal collecting device.
E. data analysis unit 7 completes rotary drum rack measurement result, Combustion tester and EFI parameter acquisition unit
Data transmission after, automatically into data synchronization processing link.
F. after the completion of data synchronization processing, handling result is exported and is preserved.
G. instantaneous emission and combustion characteristics correlation analysis are carried out to the data file exported after synchronization process.
As shown in figure 3, in the present embodiment, in the step F, data synchronization processing calculation step includes：
F1. drum test rack and the time shaft in EFI parameter acquisition unit gathered data result and speed are extracted respectively
Data, using vehicle speed data as variable is referred to, the time shaft of drum test rack gathered data is as fiducial time；
F2. the identical work of vehicle speed data characteristic segments is measured by comparing drum test rack and EFI parameter acquisition unit respectively
The time of condition point obtains the time difference △ ti of two data collecting systems, as shown in figure 4, when EFI parameter acquisition unit is compared
When drum test rack acquisition time shifts to an earlier date, △ ti ＜ 0, when EFI parameter acquisition system compares drum test rack acquisition time
When lag, △ ti ＞ 0.
F3. at least three difference vehicle speed data characteristic segments pair of operation points ratio is chosen, to obtain multiple and different △ ti, EFI
Time after parameter acquisition system synchronizes is：
Wherein：tINCA_SynThe rear time is synchronized for EFI parameter acquisition system；tINCAWhen original for EFI parameter acquisition system
Between；N is gained △ tiQuantity.
F4. respectively extraction complete above-mentioned steps F1 synchronized to step F3 after EFI parameter acquisition unit with it is not yet synchronous
Time shaft measured by Combustion tester and engine speed data, using engine speed data as synchronous reference variable, together
The time shaft of EFI parameter acquisition unit is as fiducial time after step.
F5. when vehicle start-stop function (STT) is closed, by comparing Combustion tester and EFI parameter acquisition unit respectively
The time for measuring the identical operating point of engine speed data characteristic segments obtains the time difference △ t of two data collecting systemsi, such as
Shown in Fig. 5.When Combustion tester compares the time advance of EFI parameter acquisition unit, △ ti＜ 0, when Combustion tester is compared
When EFI parameter acquisition system time lag, △ ti＞ 0, the Combustion tester data time after synchronizing are：
Wherein：tComb_SynThe rear time is synchronized for EFI parameter acquisition unit；tCombWhen original for EFI parameter acquisition unit
Between；N is gained △ tiQuantity, n >=3.
When vehicle start-stop function (STT) is opened, from on-test, shutting down must be started each time after starting by comparison
The identical operating point of machine speed curves characteristic segments obtains this section of driving cycle and corresponds to time difference △ ti, until off-test, such as Fig. 6
It is shown；When Combustion tester compares the time advance of EFI parameter acquisition unit, △ ti＜ 0, when Combustion tester is compared to electricity
When spraying the time lag of parameter acquisition unit, △ ti＞ 0；It must ensure at least to select per the driving cycle between start-stop operation twice
1 engine speed graph characteristic segments pair of operation points ratio is taken, determines at least one △ ti, Combustion tester acquisition under this condition
The time slice method of synchronization is as follows：
ti_(Comb_Syn)=ti_(Comb)-△ti
tComb_Syn=[t1_(Comb_Syn),t2_(Comb_Syn),…,tn_(Comb_Syn)]
Wherein：ti_(Comb_Syn)To synchronize the rear time per the Combustion tester acquisition between start-stop operation twice；ti_(Comb)For
Original time is acquired per the Combustion tester between start-stop operation twice；tComb_SynIt is complete after being synchronized for Combustion tester acquisition
Time data is the set of segment data；N is gained △ tiQuantity.
F6. discharge measuring data and EFI supplemental characteristic after synchronizing according to Combustion analysis data circular order and follow
The ring time carries out the linear interpolation between each two consecutive number strong point on the time shaft after each motor synchronizing, obtains and combustion analysis
Discharge measuring data after data dimension and the identical synchronization process of data point spacing and EFI supplemental characteristic.
F7. the combustion analysis that will be obtained in the discharge measuring data obtained in step F6, EFI supplemental characteristic and step F5
Data export and save as the common-format files such as * .dat or * .txt.
In the present embodiment, the step G is specially：After obtaining the data of synchronization process according to step F7, respectively to occurring
Instantaneous discharge increases the corresponding burn cycle parameter of operating mode and EFI parameter is compared, and combines discharge measuring as a result, to wink
When discharge the reason of increasing and analyzed with the relevance of engine combustion.
Claims (5)
1. a kind of engine transient emission test analysis system, it is characterised in that：Including exhaust apparatus (1), drum test rack
Control system (2), drum test rack (3), test vehicle (4), Combustion tester (5), EFI parameter acquisition unit (6), number
According to analytic unit (7), slave computer (8) and cylinder pressure sensor (9),
The two-way sampling channel probe of the exhaust apparatus (1) is mounted respectively to the front and rear sides of the catalyst converter of test vehicle (4),
And exhaust apparatus (1) is connect with drum test pedestal control system (2)；
The drum test rack (3) connect with drum test pedestal control system (2)；
The drum test pedestal control system (2) connect with data analysis unit (7), by the test result of exhaust apparatus (1)
Data analysis unit (7) is sent to by drum test pedestal control system (2) with the measurement result of drum test rack (3)；
The quantity of the cylinder pressure sensor (9) is identical as the number of cylinders of engine, is separately mounted at each cylinder, and each cylinder pressure passes
The signal wire of sensor is connect by charge amplifier with Combustion tester (5), the Combustion tester (5) and data analysis unit
(7) it connects, the data that Combustion tester (5) is exported is inputed into data analysis unit (7)；
The EFI parameter acquisition unit (6) connect with vehicle ECU and data analysis unit (7) respectively, by EFI parameter acquisition
The data that unit (6) is acquired are sent to data analysis unit (7)；
The data analysis unit (7) connect with slave computer (8), and handling result is sent to slave computer by data analysis unit (7)
(8) it is preserved.
2. engine transient emission test analysis system according to claim 1, it is characterised in that：The data analysis list
First (7) include data processing operation module (7b), and the physical signal being connect respectively with data processing operation module (7b) is adopted
Collect module (7a), parameter setting module (7c), serial communication module (7d), the first CAN communication module (7e), the second CAN communication
Module (7f) and TCP/IP communication modules (7g)；
The serial communication module (7d) connect with drum test pedestal control system (2), for receiving exhaust apparatus (1) and turning
The data that drum test-bed (3) is tested；
The first CAN communication module (7e) connect with EFI parameter acquisition unit (6), for receiving EFI parameter acquisition unit
(6) data exported；
The second CAN communication module (7f) or TCP/IP communication modules (7g) are connect with Combustion tester (5), for receiving combustion
Burn the data that analyzer (5) exports；
The physical signal acquisition module (7a) controls signal for acquiring combustion physics signal with EFI；
The parameter setting module (7c) is for being arranged parameter needed for data processing；
The data processing operation module (7b) is used to carry out the data synchronization of multisystem and analysis parameter calculates.
3. a kind of engine transient emission test analysis method, it is characterised in that：Using starting as claimed in claim 1 or 2
Machine instantaneous emission detecting and analysing system, method include：
A., the two-way sampling channel of exhaust apparatus (1) after preheating probe is mounted respectively to the catalyst converter of test vehicle (4)
Front and rear sides；Each cylinder pressure sensor (9) is mounted respectively to each cylinder of engine, sensor signal lines are passed through into charge amplifier
It is connect with Combustion tester (5)；EFI parameter acquisition unit (6) is attached with vehicle ECU；Drum test rack is controlled
System (2) is connect with data analysis unit (7)；Combustion tester (5) is connect with data analysis unit (7)；By EFI parameter
Collecting unit (6) is connect with data analysis unit (7)；
B. the trigger collection clock source of setting drum test pedestal control system (2) and EFI parameter acquisition unit (6) is equipment
Internal clocking, setting Combustion tester (5) trigger collection clock source are crankshaft signal；
C. it operates each equipment and starts test vehicle, vehicle is run according to target vehicle operating mode；
D. stop vehicle after the completion of the operation of vehicle operating mode and close engine, be simultaneously stopped each signal collecting device；
E. data analysis unit (7) completes rotary drum rack measurement result, Combustion tester and EFI parameter acquisition unit
After data transmission, automatically into data synchronization processing link；
F. after the completion of data synchronization processing, handling result is exported and is preserved；
G. instantaneous emission and combustion characteristics correlation analysis are carried out to the data file exported after synchronization process.
4. engine transient emission test analysis method according to claim 3, it is characterised in that：In the step F,
Data synchronization processing calculation step includes：
F1. the time shaft and speed number in drum test rack and EFI parameter acquisition unit gathered data result are extracted respectively
According to using vehicle speed data as variable is referred to, the time shaft of drum test rack gathered data is as fiducial time；
F2. the identical operating point of vehicle speed data characteristic segments is measured by comparing drum test rack and EFI parameter acquisition unit respectively
Time, obtain the time difference △ t of two data collecting systemsi, when EFI parameter acquisition unit is adopted compared to drum test rack
When collecting time advance, △ ti＜ 0, when EFI parameter acquisition system is lagged compared to drum test rack acquisition time, △ ti＞ 0；
F3. at least three difference vehicle speed data characteristic segments pair of operation points ratio is chosen, to obtain multiple and different △ ti, EFI parameter adopts
Time after collecting system synchronizes is：
Wherein：tINCA_SynThe rear time is synchronized for EFI parameter acquisition system；tINCAFor EFI parameter acquisition system original time；n
For gained △ tiQuantity；
F4. the EFI parameter acquisition unit after above-mentioned steps F1 is synchronized to step F3 and not yet synchronous burning are completed in extraction respectively
Time shaft measured by analyzer and engine speed data, using engine speed data as synchronous reference variable, after synchronizing
The time shaft of EFI parameter acquisition unit is as fiducial time；
F5. when vehicle start-stop function is closed, started by comparing Combustion tester respectively and being measured with EFI parameter acquisition unit
The time of the identical operating point of machine rotary speed data characteristic segments obtains the time difference △ t of two data collecting systemsi, work as combustion analysis
When instrument compares the time advance of EFI parameter acquisition unit, △ ti＜ 0, when Combustion tester compares EFI parameter acquisition system
Between when lagging, △ ti＞ 0, the Combustion tester data time after synchronizing are：
Wherein：tComb_SynThe rear time is synchronized for EFI parameter acquisition unit；tCombFor EFI parameter acquisition unit original time；n
For gained △ tiQuantity, n >=3；
When vehicle start-stop function is opened, from on-test, shutting down each time must be bent by comparing engine speed after starting
The identical operating point of line characteristic segments obtains this section of driving cycle and corresponds to time difference △ ti, until off-test；When Combustion tester phase
Than EFI parameter acquisition unit time advance when, △ ti＜ 0, when Combustion tester compares the time of EFI parameter acquisition unit
When lag, △ ti＞ 0；1 engine speed graph characteristic segments is at least chosen per the driving cycle between start-stop operation twice
Pair of operation points ratio determines at least one △ ti, Combustion tester acquisition time segment sync mode is as follows under this condition：
ti_(Comb_Syn)=ti_(Comb)-△ti
tComb_Syn=[t1_(Comb_Syn),t2_(Comb_Syn),…,tn_(Comb_Syn)]
Wherein：ti_(Comb_Syn)To synchronize the rear time per the Combustion tester acquisition between start-stop operation twice；ti_(Comb)It is every two
Combustion tester between secondary start-stop operation acquires original time；tComb_SynFull time after being synchronized for Combustion tester acquisition
Data are the set of segment data；N is gained △ tiQuantity；
F6. discharge measuring data and EFI supplemental characteristic after synchronizing according to Combustion analysis data circular order and cycle when
Between, the linear interpolation between each two consecutive number strong point is carried out on the time shaft after each motor synchronizing, is obtained and Combustion analysis data
Discharge measuring data after dimension and the identical synchronization process of data point spacing and EFI supplemental characteristic；
F7. the Combustion analysis data that will be obtained in the discharge measuring data obtained in step F6, EFI supplemental characteristic and step F5
It exports and preserves.
5. engine transient emission test analysis method according to claim 4, it is characterised in that：The step G is specific
For：After obtaining the data of synchronization process according to step F7, the corresponding burn cycle ginseng of operating mode is increased to there is instantaneous discharge respectively
Number and EFI parameter compared, and combine discharge measuring as a result, to instantaneously discharge the reason of raising and with engine combustion
Relevance is analyzed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273738A (en) * | 2019-03-14 | 2019-09-24 | 吉林大学 | A kind of heavy-duty engine discharge diagnostic test system |
| CN110967191A (en) * | 2019-11-26 | 2020-04-07 | 辽宁龙马安泰网络技术有限责任公司 | Method for detecting emission of exhaust gas generated during running of automobile |
| CN112213109A (en) * | 2020-09-16 | 2021-01-12 | 哈尔滨东安汽车发动机制造有限公司 | Initial phase test method for variable valve timing system of engine |
| CN112284741A (en) * | 2020-09-07 | 2021-01-29 | 东风汽车集团有限公司 | Be used for engine combustion analysis to gather and automatic control system |
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