CN118066137A - Test method for testing performance of turbocharger by engine bench - Google Patents
Test method for testing performance of turbocharger by engine bench Download PDFInfo
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- CN118066137A CN118066137A CN202410215846.0A CN202410215846A CN118066137A CN 118066137 A CN118066137 A CN 118066137A CN 202410215846 A CN202410215846 A CN 202410215846A CN 118066137 A CN118066137 A CN 118066137A
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000010586 diagram Methods 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims 4
- 239000010687 lubricating oil Substances 0.000 claims 2
- 230000005856 abnormality Effects 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 7
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Abstract
A test method for testing performance of a turbocharger by an engine bench belongs to the technical field of engine benches. The method comprises the following steps: s1, preparing operation before test; s2, preheating an engine; s3, adjusting the load of the engine at each rotating speed point, and recording test data; s4, adjusting a pipeline before the pressure of the supercharger to enable the pressure to reach 0.5xKPa, 1.5xKPa and 2xKPa respectively in a full-speed full-load state, repeating the steps S1-S3, and recording test data; s5, deriving test data and drawing an actual measurement map; s6, drawing the actually measured map and the simulated map in the same worksheet, so that the difference and the efficiency can be seen. The invention enables the host factory to measure the maps of the booster compressors of different manufacturers on the engine rack, thereby calculating the actual booster efficiency to compare with the difference of simulation results and providing a direction for the next optimization of the booster. And when the host factory uniformly tests the booster map, the data difference caused by different standards of different booster manufacturers can be avoided.
Description
Technical Field
The invention belongs to the technical field of engine benches, and particularly relates to a test method for testing performance of a turbocharger by an engine bench.
Background
The turbocharger is a part with great influence on the performance of the supercharged engine, and a main engine factory needs to evaluate and optimize the turbocharger in the development stage until the performance reaches the target requirement. However, the turbocharger performance curves are all provided by each turbocharger manufacturer, and for the data provided, the host manufacturer cannot evaluate the authenticity, and cannot compare the actual turbocharger efficiency with the efficiency differences provided by the simulation calculations. Therefore, a scheme is needed that can actually measure the map of the supercharger compressor on the engine bench, and can calculate the actual efficiency and compare the actual efficiency with the simulation result.
In addition, problems such as high oil consumption, insufficient performance and the like can occur in the whole engine development process, however, factors influencing the performances are many, and if reverse investigation is still adopted, a large amount of non-formation cost, period and manpower can be wasted, and even company benefits are influenced.
Disclosure of Invention
The invention aims to solve the problems, and further provides a test method for testing the performance of the turbocharger by using the engine bench.
The technical scheme adopted by the invention is as follows:
A test method for testing turbocharger performance by an engine bench, comprising the steps of:
s1, preparing operation before test;
S2, preheating an engine;
S3, adjusting the load of the engine at each rotating speed point, and recording test data;
s4, adjusting a pipeline before the pressure of the supercharger to enable the pressure to reach 0.5xKPa, 1.5xKPa and 2xKPa respectively in a full-speed full-load state, repeating the steps S1-S3, and recording test data;
s5, deriving test data and drawing an actual measurement map;
s6, drawing the actually measured map and the simulated map in the same worksheet, so that the difference and the efficiency can be seen.
Compared with the prior art, the invention has the following beneficial effects:
The invention can check the performance of the supercharger from the forward direction, display the difference between the actually measured map and the simulated map by using data, and directly judge whether the supercharger meets the design target.
The invention enables the host factory to measure the maps of the booster compressors of different manufacturers on the engine rack, thereby calculating the actual booster efficiency to compare with the difference of simulation results and providing a direction for the next optimization of the booster. And when the host factory uniformly tests the booster map, the data difference caused by different standards of different booster manufacturers can be avoided.
Drawings
FIG. 1 is a graph of the difference between simulated and measured maps;
FIG. 2 is a diagram of an actual map and a simulated map of the present invention;
FIG. 3 is a graph of the difference between the measured map and the simulated map;
Detailed Description
For a better understanding of the objects, structures and functions of the present invention, reference should be made to the following detailed description of the invention with reference to the accompanying drawings.
The compressor map has 3 coordinate axes, with the X axis representing the folded flow, the Y axis representing the pressure ratio, and the Z axis representing the efficiency. The more test data, the finer the map is drawn, and the data points with even distribution can be screened out usually by carrying out the engine universal characteristic test under the boundary condition of 3-4 times of different gradients on the whole machine. In the test process, relevant parameters such as pre-vortex temperature, pre-vortex pressure, turbine rotating speed, engine rotating speed, load (%), torque, power, fuel consumption rate, total pre-pressure temperature, oil inlet oil pressure, water outlet temperature, crankcase pressure, ambient temperature, total post-pressure temperature, intake manifold pressure, intake manifold temperature and the like are required to be recorded for subsequent map data calculation.
Flow rate: in the case of the air flow rate flowing through the impeller, it is generally necessary to correct the flow rate calculated in the test environment with respect to the standard environment (atmospheric pressure=100 kPa (750 mmHg), ambient temperature=298K (25 ℃), due to the difference between the ambient temperature and the pressure during the test. Actual measurement flow rate calculation formula: actual air-fuel ratio fuel consumption rate (g/kw.h) power (kw)/3600000, compressor reduced flow calculation formula:
Wherein:
g c -the measured flow rate of the compressor in kilograms per second (kg/s);
P 0 -atmospheric pressure in standard conditions, in Pa.
P 1 -the measured total pressure of the compressor, in Pa.
G mp -compressor reduced flow in kilograms per second (kg/s);
-total temperature of gas at the inlet of the compressor, in kelvin (K);
Pressure ratio: ratio of total post-press pressure to total pre-press pressure. The total pressure needs to be calculated using a pressure sensor, an air flow rate sensor, and the speed of sound of the local environment. Total pressure = static pressure x (1+0.2 mach number 2), mach number equal to compressor front (back) flow rate/local sonic velocity. Since the pressure ratio is the ratio of the total temperature before and after, the difference between the total temperature and the static temperature is extremely small when the calculation is performed, and the static temperature calculation is considered to be adopted.
Efficiency is that: the gas is compressed to a certain pressure ratio, and the ratio of adiabatic compression work to actual compression work is increased. The direct parameters of the compressor performance were evaluated under the same flow, pressure ratio conditions. The calculation formula is as follows:
-total temperature of gas at the inlet of the compressor, in kelvin (K);
-total temperature of the gas at the outlet of the compressor, in kelvin (K);
K-air insulation index, k=1.4.
-Boost ratio;
Note that: total temperature = static temperature× (1+0.2 mach number 2)
In summary, the screened data points are drawn into a compressor map by UNIPLOT software, and can be compared with a simulation map provided by a supercharger supplier to check the difference between the current physical state and the simulation, so that the next optimization direction of the supercharger can be provided.
The invention discloses a test method for testing the performance of a turbocharger by an engine bench, which comprises the following steps:
s1, preparing operation before test;
s11, checking whether the operation is normal after starting the engine, and confirming that the pipeline has no air leakage, oil leakage and water leakage;
s12, preheating the engine, controlling the oil temperature to be more than 85 ℃, and recording the pressure record x KPa after full-speed full-load space-time filtration;
s13, data needing to be recorded: pre-vortex temperature, pre-vortex pressure, turbine speed, engine speed, load (%), torque, power, fuel consumption rate, total pre-pressure temperature, lubricant inlet oil pressure, outlet water temperature, crankcase pressure, ambient temperature, total post-pressure, total post-pressure temperature, intake manifold pressure, intake manifold temperature.
For an engine with an EGR system, the EGR is required to be kept in a fully closed state during the test.
The rest of the test conditions were carried out according to GB/T18297-2001 test method for automobile Engine Performance.
S2, preheating the engine to more than 85 ℃, and observing whether recorded test data are normal or not;
S3, adjusting the load of the engine at each rotating speed point, and recording test data;
Engine operation 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, and total machine maximum rotational speed rpm, engine load was adjusted by 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% at each rotational speed point, and test data were recorded after the engine was stabilized.
In the test process, the running state of the engine needs to be detected, if the running state is abnormal, the test needs to be stopped immediately, and the turbine rotating speed needs to be ensured not to exceed the required limit value.
S4, adjusting a pipeline before the pressure of the supercharger (using air filters or plugs in different pressure loss states) to enable the pressure to reach 0.5xKPa, 1.5xKPa and 2xKPa respectively in a full-speed full-load state, repeating the steps S1-S3, and recording test data. (the purpose of this step is to make data points at different flow rates, pressure ratios, provide a sufficient database for map rendering)
S5, deriving test data and drawing an actual measurement map;
And (3) deriving test data, calculating flow and pressure ratio of each point, drawing a scatter diagram, selecting data points with uniform distribution and maximum range through the scatter diagram, correcting and calculating efficiency by using the screened data points, and drawing a final actual measurement map by using UNIPLOT software.
S6, drawing the actually measured map and the simulated map in the same worksheet, so that the difference and the efficiency can be seen.
The difference between the simulated and measured maps can be seen in figure 1,
The engine simulation run line is plotted in map as shown in figure 2,
The efficiency of each operating point is read, summarized into a table as shown in figure 3,
In summary, it can be seen that the difference between the measured map and the simulated map, due to this difference, results in a 1-2 percent drop in efficiency.
It will be understood that the application has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A test method for testing the performance of a turbocharger by an engine bench is characterized by comprising the following steps of: the method comprises the following steps:
s1, preparing operation before test;
S2, preheating an engine;
S3, adjusting the load of the engine at each rotating speed point, and recording test data;
s4, adjusting a pipeline before the pressure of the supercharger to enable the pressure to reach 0.5xKPa, 1.5xKPa and 2xKPa respectively in a full-speed full-load state, repeating the steps S1-S3, and recording test data;
s5, deriving test data and drawing an actual measurement map;
s6, drawing the actually measured map and the simulated map in the same worksheet, so that the difference and the efficiency can be seen.
2. A test method for engine block testing turbocharger performance as defined in claim 1, wherein: the preparation operation before the test of S1 comprises the following steps:
s11, checking whether the operation is normal after starting the engine, and confirming that the pipeline has no air leakage, oil leakage and water leakage;
s12, preheating an engine, controlling the oil temperature to be above 85 ℃, and recording full-speed full-load time-space filtered pressure memory xKPa;
S13, data needing to be recorded: the turbine speed, the engine speed, the load, the torque, the power, the fuel consumption rate, the total pressure before the pressure, the total temperature before the pressure, the oil inlet temperature of the lubricating oil, the oil inlet pressure of the lubricating oil, the water outlet temperature, the crankcase pressure, the ambient temperature, the total pressure after the pressure, the total temperature after the pressure, the pressure of an intake manifold and the temperature of the intake manifold.
3. A test method for engine block testing turbocharger performance as defined in claim 1, wherein: the step S2 is specifically as follows: the engine was warmed up to above 85 ℃ and the recorded test data were observed to be normal.
4. A test method for engine block testing turbocharger performance as defined in claim 1, wherein: the specific operation steps of the S3 are as follows:
Engine operation 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, and total machine maximum rotational speed rpm, engine load was adjusted by 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% at each rotational speed point, and test data were recorded after the engine was stabilized.
5. A test method for testing turbocharger performance of an engine block according to claim 3, wherein: in the test process of S3, it is necessary to detect the engine operating state, and if an abnormality occurs, the test is stopped immediately, and the turbine rotation speed needs to be ensured not to exceed the required limit value.
6. A test method for engine block testing turbocharger performance as defined in claim 1, wherein: the specific steps of the S5 are as follows: and (3) deriving test data, calculating flow and pressure ratio of each point, drawing a scatter diagram, selecting data points with uniform distribution and maximum range through the scatter diagram, correcting and calculating efficiency by using the screened data points, and drawing a final actual measurement map.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118979812A (en) * | 2024-10-22 | 2024-11-19 | 潍柴动力股份有限公司 | Supercharger lubrication control method and related device |
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2024
- 2024-02-27 CN CN202410215846.0A patent/CN118066137A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118979812A (en) * | 2024-10-22 | 2024-11-19 | 潍柴动力股份有限公司 | Supercharger lubrication control method and related device |
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