CN107063691A - Diesel-engine road vehicle Engine Universal Characteristics test method - Google Patents
Diesel-engine road vehicle Engine Universal Characteristics test method Download PDFInfo
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- CN107063691A CN107063691A CN201710013301.1A CN201710013301A CN107063691A CN 107063691 A CN107063691 A CN 107063691A CN 201710013301 A CN201710013301 A CN 201710013301A CN 107063691 A CN107063691 A CN 107063691A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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Abstract
A kind of diesel-engine road vehicle Engine Universal Characteristics test method, choose and the supporting particulate matter trap of engine to be calibrated, the exhaust gas circuit of engine to be calibrated is connected to after the particle collection plate of particulate matter trap tail end is removed, Engine Universal Characteristics experiment is then carried out in accordance with the following steps：Start engine, by step-length of speed test step-length from starting rotating speed to maximum speed, engine is closed after measuring each operating mode point data；Start engine, by step-length of mean effective pressure step-length from starting mean effective pressure to maximum pressure, engine is closed after measuring each operating mode point data；Diesel-engine road vehicle Engine Universal Characteristics test method of the present invention, the grain catcher for removing particle collection plate is used in universal characteristic experiment by this method at the trial, extra simulated test facility need not be not only further added by, the characteristic of actual condition can also more accurately be simulated, the efficiency worked engine calibration is greatly accelerated, R＆D costs are reduced.
Description
Technical field
Field, more particularly to a kind of Engine Universal Characteristics test method are demarcated the present invention relates to vehicle motor.
Background technology
Diesel engine because of it there is thermal efficiency height, the low advantage of oil consumption increasingly to be popularized in vehicular engine.But with
Abgasgesetz increasingly strict, some after-treatment devices are also widely used on diesel engine.Solve the problems, such as diesel emission at present
After-treatment device in, including diesel engine particulate thing trap.Diesel particulate trap diesel particulate trap energy
Particulate matter in exhaust is caught by internal filter, but with the particulate count being collected into diesel particulate trap
The increase of amount, exhaust back pressure also increases therewith.In diesel engine universal characteristic and raw emissions process of the test, it is generally based on new
The back pressure of fresh after-treatment system completes basic test, during engine test, and the effect of exhaust particulate trap is trapping
The particle generated after being burnt in tail gas is to meet national emission regulation demands, when the particle trapped in grain catcher is more and more
When can cause local stoppages exhaust it is not smooth, shown as in data pressure at expulsion increase, and then can make charger boost efficiency drop
Pressure is less than normal, air inflow is less than normal after low, supercharging, makes the overall intake airflow dynamics model of engine inaccurate and can not meet test requirements document, to base
Plinth staking-out work brings very big puzzlement；
It is general in existing calibration process to solve diesel particulate trap blockage problem, method one using two methods：In examination
Test to raise once discovery pressure at expulsion and take oil spout measure after pressure engine if normal value, fuel oil is entered exhaust fast
Burnt during pipe, allow delivery temperature rise to discharge particle burning；The method advantage is need not to increase additional tests equipment, is had the disadvantage
Need to take considerable time and fuel oil excludes particle and this malcombustion can produce harmful effect to engine；Method
Two：Replace normal diesel particulate trap using valve plate-type pressure simulation device, the advantage of this mode is that of avoiding
Grain thing, which is blocked, makes the problem of pressure at expulsion is raised, and having the disadvantage to need constantly to adjust valve block aperture makes in different rotating speeds and averagely have
Imitate pressure at expulsion under pressure and, close to normal value, waste the plenty of time, extend the construction cycle.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of diesel-engine road vehicle Engine Universal Characteristics test method, should
The grain catcher for removing particle collection plate is used in universal characteristic experiment by method at the trial, need not only be further added by volume
Outer simulated test facility, without the extra fuel oil of consuming and time cost, moreover it is possible to the spy of more accurate simulation actual condition
Property, the efficiency worked engine calibration is greatly accelerated, R＆D costs are reduced.
What the present invention was realized in：A kind of diesel-engine road vehicle Engine Universal Characteristics test method, choose with it is to be calibrated
The supporting particulate matter trap of engine, hair to be calibrated is connected to after the particle collection plate of particulate matter trap tail end is removed
The exhaust gas circuit of motivation, then carries out Engine Universal Characteristics experiment in accordance with the following steps：
S1. universal characteristic operating point is set, the parameter of the universal characteristic operating point includes engine speed and mean effective pressure
Power, step-length, starting rotating speed, mean effective pressure step-length and starting mean effective pressure are tested by setting speed；Tried with rotating speed
Test step-length and start engine from starting rotating speed to maximum speed for step-length, at each speed using mean effective pressure step-length as step
It is long to obtain corresponding engine speed and mean effective pressure point from starting mean effective pressure to maximum pressure for universal characteristic
Operating point；
S2. under universal characteristic operating point, engine speed, moment of torsion, power, fuel consumption meter measurement oil consumption are measured by dynamometer machine
Amount, mass air flow sensor measurement engine intake airflow, temperature sensor measurement intake air temperature, delivery temperature, pressure sensor is surveyed
Admission pressure, pressure at expulsion are measured, the data obtained by measuring, which are calculated, to be obtained under different rotating speeds and different mean effective pressures
Calibration value, completes engine calibration process.
In the step S1, institute's speed test step-length is 200r/min, and starting rotating speed is 800r/min, and maximum speed is by sending out
Motivation is had characteristic by oneself and determined.
In the step S1, the mean effective pressure calculation formula is：0.04 π * moments of torsion/engine displacement, averagely have
It is 1bar to imitate pressure step-length, and starting mean effective pressure is 1bar, and maximum pressure is had characteristic by oneself by engine and determined.
Diesel-engine road vehicle Engine Universal Characteristics test method of the present invention, this method will remove particle collection at the trial
The grain catcher of plate is used in universal characteristic experiment, need not only be further added by extra simulated test facility, moreover it is possible to more smart
The characteristic of true simulation actual condition, greatly accelerates the efficiency worked engine calibration, reduces R＆D costs.
Brief description of the drawings
Fig. 1 is existing diesel particulate trap structure principle chart；
In Fig. 1：1 air admission hole, 2 tube walls, 3 stomatas, 4 air inlet air flues, 5 exhaust air flues, 6 particle collection plates, 7 gas outlets；
Fig. 2 is the grain catcher air flow path schematic diagram after dismounting particle collection plate；
Fig. 3 is to carry out experiment and the contrast test figure of existing analogue means using the method for the present invention；
Abscissa is charge flow rate, and unit is mg/hug；Ordinate is pressure at expulsion, and unit is mbar.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention stated has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Embodiment 1
As shown in figure 1, existing diesel particulate trap includes being separated into some air inlets by tube wall 2 in a cavity, cavity
Air flue 4 and exhaust air flue 5, one end of cavity 1 are provided with air admission hole 1, and the other end of cavity 1 is particle collection plate 6；The pipe
The stage casing of wall 2 is provided with some stomatas 3；Exhaust airstream enters in the inlet channel 4 of grain catcher from the air admission hole 1 of cavity,
Gas part is flowed out after entering adjacent exhaust passage 5 by the stomata 3 on tube wall 2 from gas outlet 7, and particulate matter is made due to inertia
With impact forward is continued to the particle collection plate 6 of the bottom of inlet channel 4, so as to be trapped by particle collection plate 6；But,
At work, inevitable partial particulate thing by, because various effects are adsorbed, accumulating, stomata 3 over time during stomata 3
Persistently it is blocked, exhaust back pressure also increases therewith.
A kind of diesel-engine road vehicle Engine Universal Characteristics test method, chooses the particulate matter supporting with engine to be calibrated and catches
Storage, as shown in Fig. 2 being connected to the row of engine to be calibrated after the particle collection plate 6 of particulate matter trap tail end is removed
Gas gas circuit, then carries out Engine Universal Characteristics experiment in accordance with the following steps：
A kind of diesel-engine road vehicle Engine Universal Characteristics test method, chooses and the supporting particle collection of engine to be calibrated
Device, is connected to the exhaust gas circuit of engine to be calibrated, then presses after the particle collection plate of particulate matter trap tail end is removed
Engine Universal Characteristics experiment is carried out according to following steps：
S1. universal characteristic operating point is set, the parameter of the universal characteristic operating point includes engine speed and mean effective pressure
Power, step-length, starting rotating speed, mean effective pressure step-length and starting mean effective pressure are tested by setting speed；Tried with rotating speed
Test step-length and start engine from starting rotating speed to maximum speed for step-length, at each speed using mean effective pressure step-length as step
It is long to obtain corresponding engine speed and mean effective pressure point from starting mean effective pressure to maximum pressure for universal characteristic
Operating point；
S2. under universal characteristic operating point, engine speed, moment of torsion, power, fuel consumption meter measurement oil consumption are measured by dynamometer machine
Amount, mass air flow sensor measurement engine intake airflow, temperature sensor measurement intake air temperature, delivery temperature, pressure sensor is surveyed
Admission pressure, pressure at expulsion are measured, the data obtained by measuring, which are calculated, to be obtained under different rotating speeds and different mean effective pressures
Calibration value, completes engine calibration process.
In the present embodiment, when being tested, in the step S1, institute's speed test step-length is 200r/min, and starting turns
Speed is 800r/min, and maximum speed is had characteristic by oneself by engine and determined；The mean effective pressure calculation formula is：0.04 π * are turned round
Square/engine displacement, mean effective pressure step-length is 1bar, and starting mean effective pressure is 1bar, and maximum pressure is by engine
Own characteristic is determined；Diesel engine particles are solved using existing two kinds mentioned in test method of the present invention and background technology simultaneously to catch
The method of storage blockage problem completes Engine Universal Characteristics experiment, and the pressure at expulsion obtained in background technology method one is surveys
Operating mode value, needs constantly adjustment aperture to embody valve plate-type pressure simulation device, secures in test valve block aperture and obtain original
Analogue means data are contrasted, and obtain comparison diagram as shown in Figure 3, from figure 3, it can be seen that after valve block aperture is secured
Pressure at expulsion curve only sub-fraction and actual measurement operating mode value are very different close to remainder, it is necessary to constantly adjust valve block aperture
Test requirements document could be met, is tested using test method of the present invention, most diesel particulates are straight without trapping
Exhaust particulate trap was connected, diesel particulate trap is not only avoided and holds susceptible to plugging ask in process of the test
Topic, and pressure at expulsion meets test requirements document close to actual measurement operating mode value.
Claims (3)
1. a kind of diesel-engine road vehicle Engine Universal Characteristics test method, it is characterized in that：Choose supporting with engine to be calibrated
Particulate matter trap, is connected to the exhaust gas of engine to be calibrated after the particle collection plate of particulate matter trap tail end is removed
Road, then carries out Engine Universal Characteristics experiment in accordance with the following steps：
S1. universal characteristic operating point is set, the parameter of the universal characteristic operating point includes engine speed and mean effective pressure
Power, step-length, starting rotating speed, mean effective pressure step-length and starting mean effective pressure are tested by setting speed；Tried with rotating speed
Test step-length and start engine from starting rotating speed to maximum speed for step-length, at each speed using mean effective pressure step-length as step
It is long to obtain corresponding engine speed and mean effective pressure point from starting mean effective pressure to maximum pressure for universal characteristic
Operating point；
S2. under universal characteristic operating point, engine speed, moment of torsion, power, fuel consumption meter measurement oil consumption are measured by dynamometer machine
Amount, mass air flow sensor measurement engine intake airflow, temperature sensor measurement intake air temperature, delivery temperature, pressure sensor is surveyed
Admission pressure, pressure at expulsion are measured, the data obtained by measuring, which are calculated, to be obtained under different rotating speeds and different mean effective pressures
Calibration value, completes engine calibration process.
2. diesel-engine road vehicle Engine Universal Characteristics test method as claimed in claim 1, it is characterized in that：The step S1
In, institute's speed test step-length is 200r/min, and starting rotating speed is 800r/min, and maximum speed is had characteristic by oneself by engine and determined.
3. diesel-engine road vehicle Engine Universal Characteristics test method as claimed in claim 1, it is characterized in that：The step S1
In, the mean effective pressure calculation formula is：0.04 π * moments of torsion/engine displacement, mean effective pressure step-length is 1bar, is risen
Step mean effective pressure is 1bar, and maximum pressure is had characteristic by oneself by engine and determined.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966391A (en) * | 2017-11-23 | 2018-04-27 | 常熟理工学院 | Diesel particulate trap arresting efficiency verification method and device under vehicle-mounted vibration condition |
| CN110608105A (en) * | 2018-06-15 | 2019-12-24 | 上海汽车集团股份有限公司 | Automatic calibration method and device for inflation efficiency |
| CN110926822A (en) * | 2019-12-04 | 2020-03-27 | 昆山三一动力有限公司 | Engine torque model calibration method and engine torque model calibration system |
| CN111190030A (en) * | 2020-04-01 | 2020-05-22 | 河南省计量科学研究院 | Engine speed measuring instrument calibrating device |
| 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 |
| CN111649946A (en) * | 2020-04-23 | 2020-09-11 | 东风汽车集团有限公司 | Conversion method for accumulating ash in gasoline particle catcher by using engine stand working condition instead of whole vehicle working condition |
| CN112146888A (en) * | 2020-09-23 | 2020-12-29 | 中国第一汽车股份有限公司 | Parameter calibration method, device, equipment and storage medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966391A (en) * | 2017-11-23 | 2018-04-27 | 常熟理工学院 | Diesel particulate trap arresting efficiency verification method and device under vehicle-mounted vibration condition |
| CN107966391B (en) * | 2017-11-23 | 2020-10-16 | 常熟理工学院 | Method and device for verifying trapping efficiency of diesel particle trap under vehicle-mounted vibration condition |
| CN110608105A (en) * | 2018-06-15 | 2019-12-24 | 上海汽车集团股份有限公司 | Automatic calibration method and device for inflation efficiency |
| CN110926822A (en) * | 2019-12-04 | 2020-03-27 | 昆山三一动力有限公司 | Engine torque model calibration method and engine torque model calibration system |
| CN110926822B (en) * | 2019-12-04 | 2021-08-06 | 湖南道依茨动力有限公司 | Engine torque model calibration method and engine torque model calibration system |
| CN111190030A (en) * | 2020-04-01 | 2020-05-22 | 河南省计量科学研究院 | Engine speed measuring instrument calibrating device |
| 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 |
| CN111649946A (en) * | 2020-04-23 | 2020-09-11 | 东风汽车集团有限公司 | Conversion method for accumulating ash in gasoline particle catcher by using engine stand working condition instead of whole vehicle working condition |
| CN111649946B (en) * | 2020-04-23 | 2021-09-03 | 东风汽车集团有限公司 | Conversion method for accumulated ash of gasoline particle trap |
| CN112146888A (en) * | 2020-09-23 | 2020-12-29 | 中国第一汽车股份有限公司 | Parameter calibration method, device, equipment and storage medium |
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Application publication date: 20170818 |
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