CN115219208A - Test method for engine EGR system calibration - Google Patents
Test method for engine EGR system calibration Download PDFInfo
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- CN115219208A CN115219208A CN202210642539.1A CN202210642539A CN115219208A CN 115219208 A CN115219208 A CN 115219208A CN 202210642539 A CN202210642539 A CN 202210642539A CN 115219208 A CN115219208 A CN 115219208A
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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
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
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Abstract
The invention discloses a test method for engine EGR system calibration, which comprises the following steps: 1. respectively installing an air inlet of an engine exhaust pollutant automatic switching device on an engine air inlet pipeline and an exhaust pipeline, and connecting an air outlet end of the engine exhaust pollutant automatic switching device to the sampling front end of an emission analyzer; 2. stabilizing the engine under a medium load working condition, starting an air valve of an air inlet pipeline of the engine, and recording the time from the start of the air valve of the air inlet pipeline to the value stability of the emission analyzer; 3. starting an air valve of an exhaust pipeline of the engine, and recording the time from the start of the air valve of the exhaust pipeline to the stability of the numerical value of the emission analyzer; 4. the opening time of the air inlet pipeline air valve and the air outlet pipeline air valve is added with the sampling time of the bench, the sampling time is set in a controller of the automatic pipeline switching device, and the corresponding time is set on an engine bench. The method improves the calibration efficiency of the EGR system, and reduces the time and energy wasted by repeated tests.
Description
Technical Field
The invention relates to a test method for engine EGR system calibration, in particular to a test method for EGR rapid calibration on an engine with an EGR function under the original emission test state of the engine.
Background
With the rapid development of the automobile industry and the advocation of the automobile energy-saving concept, the traditional power vehicle is also continuously updated to improve the heat efficiency and reduce the emission of pollutants, and the EGR technology basically becomes a novel engine standard technology. The EGR technology can improve the air inlet temperature on the one hand, has better warming function for the start of the cold engine, and has higher practical value for the urban transportation vehicle. On the other hand, the EGR technology can effectively reduce the discharge of NOx emission pollutants, and the environmental protection level is improved. As an engine development enterprise, how to calibrate the EGR system and how to manage the EGR rate is the most important factor in engine calibration.
When the existing engine bench calibrates the EGR rate, because the emission analyzer can only test in a single way and can not realize the two-way collection, the exhaust concentration needs to be measured simultaneously for air intake and exhaust, so that the main accurate EGR rate can be calculated, but a manual switching pipeline is used on the bench, the work is very complicated, the safety hazard is great, and the purpose of quick test can not be achieved due to long time consumption.
Disclosure of Invention
The invention aims to provide a test method for engine EGR system calibration, which is mainly used for the calibration work of the engine EGR system, and through the rapid calibration of the test method, the calibration efficiency of the EGR system is improved, the time and energy wasted by repeated tests are reduced, and the product development speed is accelerated.
The purpose of the invention is realized by the following technical scheme:
a test method for engine EGR system calibration, comprising the steps of:
respectively installing an air inlet of an automatic switching device for engine exhaust pollutants on an engine air inlet pipeline and an engine exhaust pipeline, and connecting an air outlet end of the automatic switching device for engine exhaust pollutants to the sampling front end of an emission analyzer;
step two, stabilizing the engine under a medium load working condition, opening an air valve of an air inlet pipeline of the engine, and recording the time from the time when the air valve of the air inlet pipeline is opened to the time when the numerical value of the emission analyzer is stable;
step three, opening an air valve of an exhaust pipeline of the engine, and recording the time from the time when the air valve of the exhaust pipeline is opened to the time when the numerical value of the emission analyzer is stable;
and step four, adding the opening time of the air valves of the air inlet pipeline and the air valves of the air outlet pipeline to the sampling time of the bench, setting the sampling time in a controller of the automatic pipeline switching device, setting the corresponding time on an engine bench, editing the working conditions of the engine at intervals of 500rpm and 5% of the opening of an accelerator, and finishing the automatic point sweeping work of the engine bench.
Compared with the prior art, the invention has the following advantages:
1. can avoid manual inflation, the inflation time that the gas pipeline overlength caused increases, the unable accurate control of gas concentration in the testing process, can not guarantee whether gas all is the sample gas of being surveyed in the short time pipeline, improve test efficiency, shorten test time at every turn.
2. Shortening the gas lines reduces the occurrence of condensed water in the exhaust, reduces equipment plugging, and reduces NO X The condition that pollutants are fused into water to form nitrate improves NO X The measurement accuracy of (2).
Drawings
FIG. 1 is an experimental schematic diagram of an automatic engine exhaust pollutant switching device;
FIG. 2 is a schematic structural diagram of an automatic switching device for gas pipelines;
in the figure, 1-emission analyzer, 2-gas pipeline automatic switching device, 3-upper computer, 4-test gas pipeline air inlet end, 5-test gas pipeline exhaust end, 6-engine EGR system, 7-EGR valve, 8-air inlet, 9-gas on-off valve, 10-gas tee joint, 11-air outlet, 12-control circuit, 13-relay, 14-timing trigger.
Detailed Description
The technical solutions of the present invention are further described below, but not limited thereto, and modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
The invention provides a test method for engine EGR system calibration, which is characterized in that an air inlet of an engine exhaust pollutant automatic switching device is respectively arranged on an engine air inlet pipeline and an engine exhaust pipeline, an air outlet end is connected to the sampling front end of an emission analyzer, and the engine EGR system calibration is carried out according to the following steps:
1. and (3) stabilizing the engine under a medium load working condition, starting an air valve of an air inlet pipeline of the engine, and recording the time from the start of the air valve of the air inlet pipeline to the value stability of the emission analyzer.
2. And opening an air valve of an exhaust pipeline of the engine, and recording the time from the opening of the air valve of the exhaust pipeline to the stability of the numerical value of the emission analyzer.
3. The method comprises the steps of adding the opening time of an air valve of an air inlet pipeline and the air valve of an air exhaust pipeline with the sampling time of a rack, setting the opening time of the air valve of the air inlet pipeline and the sampling time of the rack in a controller of an automatic pipeline switching device, setting corresponding time on an engine rack, editing the working conditions of the engine at intervals of 500rpm and 5% of accelerator opening, and finishing automatic point sweeping work by the engine rack.
In the invention, the automatic switching device for the engine exhaust pollutants is arranged on a pipeline at the sampling front end of an emission analyzer, the automatic switching device is firstly subjected to time calibration, the time required by the fact that the pipeline is filled with the detected gas when the gas circuit is switched every time is tested, and the working time of the automatic switching device for pipeline switching every time is set, so that the automatic switching device can be matched with an engine rack to quickly complete the sweeping and optimizing work of the EGR rate.
As shown in fig. 1, the automatic switching device for engine exhaust pollutants comprises an automatic switching device 2 for gas pipelines and an upper computer 3, wherein:
the air inlet of the automatic gas pipeline switching device 2 is connected with an engine air inlet pipeline 4 through a pipeline 1;
the air inlet of the automatic gas pipeline switching device 2 is connected with an engine exhaust pipeline 5 through a pipeline 2;
an EGR valve 7 is arranged between the engine air inlet pipeline 4 and the engine air inlet pipeline 5;
the gas pipeline automatic switching device 2 is connected with the emission analyzer 1;
the upper computer 3 is connected with the gas pipeline automatic switching device 2 and is used for controlling the automatic switching of the gas pipeline between the pipeline 1 and the pipeline 2.
As shown in fig. 2, the gas pipeline automatic switching device 2 is composed of a gas inlet 8, a gas on-off valve 9, a gas tee 10, a gas outlet 11, a control circuit 12, a relay 13 and a timing trigger 14, wherein:
the air inlet comprises a pipeline 1 air inlet and a pipeline 2 air inlet;
the gas on-off valve 9 comprises a pipeline 1 gas on-off valve and a pipeline 2 gas on-off valve;
one end of the air inlet of the pipeline 1 is connected with the pipeline 1, and the other end of the air inlet of the pipeline 1 is connected with one end of the gas on-off valve of the pipeline 1;
one end of the air inlet of the pipeline 2 is connected with the pipeline 2, and the other end of the air inlet of the pipeline 2 is connected with one end of the gas on-off valve of the pipeline 2;
the gas tee joint 10 is respectively connected with the other end of the gas on-off valve of the pipeline 1, the other end of the gas on-off valve of the pipeline 2 and one end of the gas outlet 11;
the other end of the air outlet 11 is connected with the emission analyzer 1;
the pipeline 1 gas on-off valve and the pipeline 2 gas on-off valve are connected with a relay 13 through a control circuit 12;
the relay 13 is connected with a timing trigger 14;
the timing trigger 14 is connected with the upper computer 3.
The working principle of the automatic test gas pipeline switching device is as follows:
the EGR valve is opened to make a small amount of waste gas enter the air inlet branch pipe and enter the combustion chamber together with combustible mixture, and CO in the part of gas 2 The concentration is called C CO2 in And CO in the total tail gas is discharged 2 The concentration is called C CO2 Total ，C CO2 in /C CO2 Total = EGR rate. Measuring inlet end CO 2 During concentration, the upper computer controls the automatic gas pipeline switching device 2 to automatically switch the gas pipeline to the pipeline 1, and then the emission analyzer 1 measures C CO2 in Measuring CO at the exhaust end 2 The gas pipeline is switched to the pipeline 2 during concentration, so that C can be quickly detected CO2 Total 。
Claims (3)
1. A test method for engine EGR system calibration, characterized in that the test method comprises the following steps:
respectively installing an air inlet of an automatic switching device for engine exhaust pollutants on an engine air inlet pipeline and an engine exhaust pipeline, and connecting an air outlet end of the automatic switching device for engine exhaust pollutants to the sampling front end of an emission analyzer;
step two, stabilizing the engine under a medium load working condition, starting an air valve of an air inlet pipeline of the engine, and recording the time from the start of the air valve of the air inlet pipeline to the stability of the numerical value of the emission analyzer;
opening an air valve of an exhaust pipeline of the engine, and recording the time from the opening of the air valve of the exhaust pipeline to the stability of the numerical value of the emission analyzer;
and step four, adding the opening time of the air valves of the air inlet pipeline and the air valves of the air outlet pipeline to the sampling time of the bench, setting the sampling time in a controller of the automatic pipeline switching device, setting the corresponding time on an engine bench, editing the working conditions of the engine at intervals of 500rpm and 5% of the opening of an accelerator, and finishing the automatic point sweeping work of the engine bench.
2. The test method for engine EGR system calibration according to claim 1, wherein the engine exhaust gas pollutant automatic switching device comprises a gas pipeline automatic switching device and an upper computer, wherein:
the air inlet of the automatic gas pipeline switching device is connected with an air inlet pipeline of the engine through a pipeline 1;
the air inlet of the automatic gas pipeline switching device is connected with an engine exhaust pipeline through a pipeline 2;
an EGR valve is arranged between the engine air inlet pipeline and the engine air inlet pipeline;
the gas pipeline automatic switching device is connected with the emission analyzer;
the upper computer is connected with the automatic gas pipeline switching device.
3. The test method for calibration of an engine EGR system according to claim 2, wherein said automatic gas line switching device comprises a gas inlet, a gas on-off valve, a gas tee, a gas outlet, a control circuit, a relay, and a timing trigger, wherein:
the air inlet comprises a pipeline 1 air inlet and a pipeline 2 air inlet;
the gas on-off valve comprises a pipeline 1 gas on-off valve and a pipeline 2 gas on-off valve;
one end of the air inlet of the pipeline 1 is connected with the pipeline 1, and the other end of the air inlet of the pipeline 1 is connected with one end of the gas on-off valve of the pipeline 1;
one end of the air inlet of the pipeline 2 is connected with the pipeline 2, and the other end of the air inlet of the pipeline 2 is connected with one end of the gas on-off valve of the pipeline 2;
the gas tee is respectively connected with the other end of the gas on-off valve of the pipeline 1, the other end of the gas on-off valve of the pipeline 2 and one end of the gas outlet;
the other end of the air outlet is connected with an emission analyzer;
the pipeline 1 gas on-off valve and the pipeline 2 gas on-off valve are connected with the relay through a control circuit;
the relay is connected with the timing trigger;
the timing trigger is connected with the upper computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210642539.1A CN115219208A (en) | 2022-06-08 | 2022-06-08 | Test method for engine EGR system calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210642539.1A CN115219208A (en) | 2022-06-08 | 2022-06-08 | Test method for engine EGR system calibration |
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| Publication Number | Publication Date |
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| CN115219208A true CN115219208A (en) | 2022-10-21 |
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| CN202210642539.1A Pending CN115219208A (en) | 2022-06-08 | 2022-06-08 | Test method for engine EGR system calibration |
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- 2022-06-08 CN CN202210642539.1A patent/CN115219208A/en active Pending
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