CN113092122A - Test method for simulating real vehicle cold start emission by using engine pedestal - Google Patents
Test method for simulating real vehicle cold start emission by using engine pedestal Download PDFInfo
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- CN113092122A CN113092122A CN202110395548.0A CN202110395548A CN113092122A CN 113092122 A CN113092122 A CN 113092122A CN 202110395548 A CN202110395548 A CN 202110395548A CN 113092122 A CN113092122 A CN 113092122A
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- 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
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
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Abstract
A test method for simulating real vehicle cold start emission by using an engine pedestal belongs to the technical field of engines. The test method can quickly verify the contribution of the upgraded and optimized parts to the emission, and greatly improves the test verification efficiency. The method comprises the following steps: s1, reducing the temperature of engine oil and the temperature of cooling liquid to room temperature; s2, connecting the engine with a discharge direct sampling device and an air-fuel ratio measuring device, and performing a cold start test; s3, entering an idling working condition after the engine is started successfully; and S4, increasing the rotating speed and the torque after a period of time, preheating the engine, recording and analyzing data in the test process, and judging the emission performance of the current engine state through a test data curve. The test method provides an efficient test method for design optimization development and CAE simulation verification of engine parts, provides a new direction for the emission development test of the national six-engine pedestal, and has a good application prospect.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a test method for simulating real vehicle cold start emission by using an engine pedestal.
Background
With the increasingly strict emission regulations, in order to meet the national six-emission regulations issued by the state, the engines of various types of companies start upgrading emission reduction work. In order to meet the requirements of the national six-law on the basis of the original five-model engine, the valve actuating mechanism, the fuel supply system, the electronic injection system, the surrounding accessories and the like of the engine need to be upgraded. And related tests show that the proportion of the emission condition in the normal-temperature cold starting state to the whole set of national six-emission test working conditions is large. Therefore, in order to verify the contribution of the upgraded and optimized parts to the emission, the cold start emission test of the whole vehicle under the room with normal temperature or low temperature environment needs to be continuously carried out. Because whole car structure is complicated, and the dismouting is changed spare part loaded down with trivial details to there is certain interference in the spare part of upgrading the change with whole car a bit, can't change the dress, just need change the system to whole car when necessary, and need soak operations such as car before the experiment, seriously influence verification efficiency, whole car reforms and still can cause the potential safety hazard.
Disclosure of Invention
In view of the defects, in order to verify, upgrade and optimize the parts efficiently and output the verification result quickly, the cold start emission test method of the engine pedestal simulation real vehicle is formed, and through the cold start test of the pedestal, the contribution of the upgraded and optimized parts to the emission can be verified quickly by matching with the real-time data optimization of the emission direct-collecting equipment and the calibration engineer, so that the test verification efficiency is greatly improved.
The technical scheme adopted by the invention is as follows:
a test method for simulating real vehicle cold start emission by using an engine pedestal comprises the following steps:
s1, reducing the temperature of engine oil and the temperature of cooling liquid to room temperature;
s2, connecting the engine with a discharge direct sampling device and an air-fuel ratio measuring device, and performing a cold start test;
s3, entering an idling working condition after the engine is started successfully;
and S4, increasing the rotating speed and the torque after a period of time, preheating the engine, recording and analyzing data in the test process, and judging the emission performance of the current engine state through a test data curve.
The invention has the beneficial effects that: the test method provided by the invention can be used for rapidly verifying the contribution degree of the optimized parts to the emission, and greatly improving the efficiency of the verification test. The efficient test method is provided for the design optimization development of engine parts and CAE simulation verification, a new direction is provided for the emission development test of the national six-engine pedestal, and the method has a good application prospect.
Drawings
FIG. 1 is a diagram of engine bench cold start emissions test method operating conditions;
FIG. 2 is a hydrocarbon-speed graph;
Detailed Description
For a better understanding of the objects, structure and function of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
The test method comprises the steps of reducing the temperature of engine oil and the temperature of cooling liquid of an engine to room temperature, connecting a discharge direct sampling device and an air-fuel ratio measuring device, carrying out a cold start test, entering an idling working condition after the engine is successfully started, increasing the rotating speed and the torque after a period of time, preheating the engine, collecting parameters such as original discharge, the quantity of particulate matters and the like (namely carrying out data recording and analysis) in the test process, and judging the discharge performance of the current engine state through a test data curve.
This optimization is further illustrated with reference to fig. 1:
1. preparation work before the test:
a) the engine for testing is arranged on the test bench, so that the engine and the test bench work normally and can be started normally and smoothly.
b) And after the engine is fully worn, adding engine oil external circulation cooling equipment, and filling the engine oil to the oil rule.
c) And closing the cooling liquid heating equipment of the rack.
d) The direct-collecting discharge equipment and the particle counting equipment complete preheating, standard gas verification is carried out, and the fact that data collected by the equipment is effective is guaranteed.
2. And (3) controlling test conditions:
a) the outlet temperature of the cooling liquid and the engine oil temperature are controlled to be 23-25 ℃ before the engine is started;
b) the outlet temperature of the cooling liquid and the temperature of the engine oil are not higher than 35 ℃ in the test process;
c) the rest of the experimental condition controls were performed as specified in GB/T18297-2001, article 6.
3. The test process comprises the following steps:
a) the program is manually or automatically operated according to the working condition of the figure 1;
b) in the starting stage, a calibration engineer adjusts and controls the sinking air-fuel ratio to be about 0.8, and the air-fuel ratio is about 1 in idling;
c) in the working condition of FIG. 1, data are acquired by a second acquisition function, and the second acquisition frequency is suggested to be 10 Hz;
d) the test was repeated 3 times according to the conditions in table 1 to ensure data consistency.
4. Data recording and analysis:
a) the data records should include, but are not limited to, the following parameters: engine speed, engine torque, coolant outlet temperature, engine oil temperature, air-fuel ratio, raw emission data, particulate matter quantity, etc.;
b) according to the result of the data collected by the test, a THC-rotating speed curve (shown in figure 2) is drawn, and a hydrocarbon integral value, a peak value, an idle value and a preheating working condition value are calculated.
Through continuous online real-time debugging and later-stage data analysis, the contribution degree of the upgraded and optimized parts to the emission can be rapidly determined, and the optimization verification test efficiency is improved.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A test method for simulating real vehicle cold start emission by using an engine pedestal is characterized by comprising the following steps: the method comprises the following steps:
s1, reducing the temperature of engine oil and the temperature of cooling liquid to room temperature;
s2, connecting the engine with a discharge direct sampling device and an air-fuel ratio measuring device, and performing a cold start test;
s3, entering an idling working condition after the engine is started successfully;
and S4, increasing the rotating speed and the torque after a period of time, preheating the engine, recording and analyzing data in the test process, and judging the emission performance of the current engine state through a test data curve.
2. The test method for simulating the cold start emission of the real vehicle by using the engine pedestal as claimed in claim 1, wherein: preparation work before the test of the test method:
a) the engine for testing is arranged on the test bench, so that the engine and the test bench work normally and can be started normally and smoothly;
b) after the engine is fully worn, adding engine oil external circulation cooling equipment, and filling the engine oil to an oil rule;
c) closing the rack cooling liquid heating equipment;
d) the direct-collecting discharge equipment and the particle counting equipment complete preheating, standard gas verification is carried out, and the fact that data collected by the equipment is effective is guaranteed.
3. The test method for simulating the cold start emission of the real vehicle by using the engine pedestal as claimed in claim 1, wherein: the test conditions of the test method were as follows,
a) the outlet temperature of the cooling liquid and the engine oil temperature are controlled to be 23-25 ℃ before the engine is started;
b) the outlet temperature of the cooling liquid and the temperature of the engine oil are not higher than 35 ℃ in the test process;
c) the rest of the experimental condition controls were performed as specified in GB/T18297-2001, article 6.
4. The test method for simulating the cold start emission of the real vehicle by using the engine pedestal as claimed in claim 1, wherein: the test procedure in S4 is specifically:
a) manually or automatically operating the program according to an engine bench cold start test working condition diagram;
b) in the starting stage, a calibration engineer adjusts and controls the sinking air-fuel ratio to be about 0.8, and the air-fuel ratio is about 1 in idling;
c) acquiring data by using a second acquisition function on an engine pedestal cold start test working condition diagram, wherein the second acquisition frequency is recommended to be 10 Hz;
d) and repeating the test for 3 times according to the cold start test working condition diagram of the engine pedestal to ensure the data consistency.
5. The test method for simulating the cold start emission of the real vehicle by using the engine pedestal as claimed in claim 1, wherein: data recording and analysis in S4:
a) the data records include the following parameters: engine speed, engine torque, coolant outlet temperature, engine oil temperature, air-fuel ratio, raw emission data, particulate matter quantity, etc.;
b) and drawing a THC-rotating speed curve according to the result of the data collected by the test, and calculating a hydrocarbon integral value, a peak value, an idle speed value and a preheating working condition value.
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Cited By (3)
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| CN113624500A (en) * | 2021-07-28 | 2021-11-09 | 广西玉柴机器股份有限公司 | Diesel engine emission fault torque limitation timing acceleration method and system |
| CN114577482A (en) * | 2022-02-28 | 2022-06-03 | 东风汽车有限公司东风日产乘用车公司 | Bench measuring vehicle emission method, electronic device and storage medium |
| AT525169A4 (en) * | 2021-08-10 | 2023-01-15 | Avl List Gmbh | Method for accelerated conditioning of an internal combustion engine system prior to performing a cold start emissions test |
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