CN110566354A - Exhaust gas recirculation system and method for measuring EGR rate - Google Patents
Exhaust gas recirculation system and method for measuring EGR rate Download PDFInfo
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- CN110566354A CN110566354A CN201910883736.0A CN201910883736A CN110566354A CN 110566354 A CN110566354 A CN 110566354A CN 201910883736 A CN201910883736 A CN 201910883736A CN 110566354 A CN110566354 A CN 110566354A
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- exhaust gas
- egr
- differential pressure
- egr rate
- pipeline
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 65
- 239000002912 waste gas Substances 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
the invention provides an exhaust gas recirculation method for measuring an EGR rate, which comprises the following steps: step 1: connecting engine exhaust gas, and initializing an EGR rate target value; step 2: obtaining the temperature of the waste gas, and cooling the waste gas to be below 250 ℃; and step 3: acquiring the pressure of waste gas in a pipeline and stabilizing the flow of the waste gas; and 4, step 4: acquiring a pressure difference value between pressure taking ports in a pipeline; and 5: calculating EGR mass flow according to the temperature of the exhaust gas, the pressure of the exhaust gas in the pipeline and the pressure difference value between pressure taking ports in the pipeline; step 6: adjusting the air inflow of the exhaust gas according to the EGR mass flow, and repeating the step 6 until the EGR rate target value is met; according to the exhaust gas recirculation system and the method for measuring the EGR rate, disclosed by the invention, the EGR flow can be adjusted in real time through closed-loop control, the target EGR rate is achieved, the emission consistency is good, and the emission of pollutants can be reduced to the maximum extent.
Description
Technical Field
the invention belongs to the technical field of EGR (exhaust gas recirculation) exhaust gas recirculation, and particularly relates to an exhaust gas recirculation system and method for measuring an EGR rate.
background
the existing EGR system is not provided with an EGR waste gas flow measuring device, and the EGR rate is controlled and calculated only through the opening degree of an EGR valve. The method for controlling and calculating the EGR rate through the opening degree of the EGR valve is used for the machine type required by the national 5 emission regulations, the EGR rate is controlled only through the opening degree of the EGR valve, the open-loop control is achieved, after the emission is upgraded to the national 6, higher requirements are provided for the emission of harmful substances such as nitrogen oxides and carbon smoke particulate matters in the exhaust gas, the control precision of the open-loop control cannot meet the requirements, the emission cannot meet the national 6 regulation requirements under the condition of the open-loop control, and the closed-loop control is performed on the EGR rate by adding measuring equipment capable of measuring the EGR rate to an EGR system of the national 6 emission machine type.
for example, chinese patent application with publication number CN101526048A discloses an efficient cooling system for exhaust gas with high EGR rate, which comprises a cooler and an EGR valve, and has the innovative points that: the system comprises a pre-cooler for cooling high-temperature large-flow exhaust gas introduced from an exhaust system; a post cooler for cooling the circulating exhaust gas introduced from the pre cooler and cooled by the pre cooler; an EGR valve is mounted in series between the pre-cooler and the post-cooler for regulating exhaust gas flow.
It can be seen that the core of the EGR rate recirculation system design in the prior art is mainly to control the exhaust gas temperature, and the exhaust gas flow and the control of the EGR rate cannot be stabilized.
disclosure of Invention
The invention aims to provide an exhaust gas recirculation system and a method for measuring an EGR rate of an engine, and aims to solve the problems that the flow of exhaust gas cannot be stabilized and the EGR rate cannot be controlled in the prior art.
in order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
the invention provides an exhaust gas recirculation method for measuring an EGR rate, which comprises the following steps:
step 1: connecting engine exhaust gas, and initializing an EGR rate target value;
Step 2: obtaining the temperature of the waste gas, and cooling the waste gas to be below 250 ℃;
And step 3: acquiring the pressure of waste gas in a pipeline and stabilizing the flow of the waste gas;
and 4, step 4: acquiring a pressure difference value between pressure taking ports in a pipeline;
And 5: calculating EGR mass flow according to the temperature of the exhaust gas, the pressure of the exhaust gas in the pipeline and the pressure difference value between pressure taking ports in the pipeline;
Step 6: and (6) adjusting the exhaust gas air inflow according to the EGR mass flow, and repeating the step 6 until the EGR rate target value is met.
the present invention also provides an exhaust gas recirculation system for measuring an EGR rate, comprising:
The EGR valve is connected with an engine exhaust pipe and used for accessing engine exhaust gas;
An EGR cooler, the inlet end of the EGR cooler is connected with an EGR valve and is used for cooling the exhaust gas to below 250 ℃;
the air inlet end of the differential pressure generating device is connected with the outlet end of the EGR cooler, and the air outlet end of the differential pressure generating device is also connected with an air inlet connecting pipe of the engine and used for stabilizing the flow of the exhaust gas;
a temperature sensor arranged at an outlet end of the EGR cooler for acquiring an exhaust gas temperature;
The temperature sensor is arranged at the outlet end of the EGR cooler or the air outlet end of the differential pressure generation device and is used for acquiring the pressure of the exhaust gas in the pipeline;
A differential pressure sensor arranged on the differential pressure generating device for acquiring the differential pressure value between the pressure taking ports in the pipeline
preferably, the differential pressure generating device is a venturi tube or an orifice plate.
preferably, one end of the differential pressure sensor is arranged at the large-diameter part of the venturi tube, and the other end of the differential pressure sensor is arranged at the small-diameter part of the venturi tube.
Preferably, one end of the differential pressure sensor is arranged at the air inlet end of the orifice plate, and the other end of the differential pressure sensor is arranged at the air outlet end of the orifice plate.
the invention has the advantages that:
1. the exhaust gas recirculation system and the method for measuring the EGR rate have higher measurement accuracy, control accuracy and good control correspondence, the EGR flow can be adjusted in real time through closed-loop control, the target EGR rate is achieved, the emission consistency is good, and the emission of pollutants can be reduced to the maximum extent.
2. the exhaust gas recirculation system and the method for measuring the EGR rate have the advantages of simple structure and low cost, realize the complex control measurement requirement through the simple structure, and are economical and practical schemes.
3. According to the exhaust gas recirculation system and the method for measuring the EGR rate, which are provided by the invention, the contribution of the EGR system to emission control is improved, the burden of post-treatment is reduced, and the development difficulty and the cost of the post-treatment are reduced.
4. The exhaust gas recirculation system and the method for measuring the EGR rate are arranged in a hot end EGR valve arrangement mode, exhaust gas firstly passes through the valve and then enters the cooler, the EGR valve has a certain protection effect on the EGR cooler, and the risk of carbon deposition and coking of the EGR valve and the cooler is lower than that of a cold end valve arrangement scheme.
5. according to the exhaust gas recirculation system and the method for measuring the EGR rate, the EGR valve is arranged in front of the Venturi tube or the orifice plate, exhaust pulses are weakened after passing through the EGR valve, the Venturi tube or the orifice plate air flow is more stable, and the EGR flow measurement is more accurate.
drawings
FIG. 1 is a flow chart illustrating the steps of an exhaust gas recirculation method of measuring EGR rate according to the present invention;
FIG. 2 is a block diagram of an embodiment of an exhaust gas recirculation system for measuring EGR rate according to the present invention;
Fig. 3 is a block diagram of another embodiment of an exhaust gas recirculation system for measuring an EGR rate according to the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an exhaust gas recirculation method for measuring an EGR rate, which comprises the following steps:
Step 1: connecting engine exhaust gas, and initializing an EGR rate target value;
Step 2: obtaining the temperature of the waste gas, and cooling the waste gas to be below 250 ℃;
And step 3: obtaining the pressure of the waste gas in the pipeline and stabilizing the flow rho of the waste gas1；
and 4, step 4: acquiring a pressure difference value delta p between pressure taking ports in a pipeline;
and 5: calculating EGR mass flow q according to exhaust gas temperature, exhaust gas pressure in pipeline and pressure difference value delta p between pressure taking ports in pipelinemmass flow rate qmCalculating according to the formula (1);
Where C is the effluxion coefficient (constant, set to 0.9804), d is the nozzle throat diameter (constant, set to 0.65), ε is the expansion coefficient (constant, set), ρ1β is a diameter ratio (constant, set to 0.45) and Δ p is a pressure difference value (detected value) between pressure taking ports in the pipe, which is the density of the exhaust gas in the pipe.
Step 6: according to EGR mass flow qmAnd adjusting the exhaust gas air inflow, and repeating the step 6 until the EGR rate target value is met.
the present invention also provides an exhaust gas recirculation system for measuring an EGR rate, comprising:
The EGR valve is connected with an engine exhaust pipe and used for accessing engine exhaust gas;
An EGR cooler, the inlet end of the EGR cooler is connected with an EGR valve and is used for cooling the exhaust gas to below 250 ℃;
the air inlet end of the differential pressure generating device is connected with the outlet end of the EGR cooler, and the air outlet end of the differential pressure generating device is also connected with an air inlet connecting pipe of the engine and used for stabilizing the flow of the exhaust gas;
a temperature sensor arranged at an outlet end of the EGR cooler for acquiring an exhaust gas temperature;
the temperature sensor is arranged at the outlet end of the EGR cooler or the air outlet end of the differential pressure generation device and is used for acquiring the pressure of the exhaust gas in the pipeline;
a differential pressure sensor arranged on the differential pressure generating device for acquiring the differential pressure value between the pressure taking ports in the pipeline
In one embodiment, the differential pressure generating device may be a venturi tube, in which case one end of the differential pressure sensor is disposed at a large diameter portion of the venturi tube and the other end of the differential pressure sensor is disposed at a small diameter portion of the venturi tube; in yet another embodiment, the differential pressure generating device may be an orifice plate, in which case one end of the differential pressure sensor is disposed at the air inlet end of the orifice plate and the other end of the differential pressure sensor is disposed at the air outlet end of the orifice plate.
Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with a feature, structure, or characteristic of one or more other embodiments without limitation, as long as the combination is not logical or operational. Additionally, the various elements of the drawings of the present application are merely schematic illustrations and are not drawn to scale.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.
Claims (5)
1. An exhaust gas recirculation method of measuring an EGR rate, comprising the steps of:
Step 1: connecting engine exhaust gas, and initializing an EGR rate target value;
step 2: obtaining the temperature of the waste gas, and cooling the waste gas to be below 250 ℃;
and step 3: acquiring the pressure of waste gas in a pipeline and stabilizing the flow of the waste gas;
And 4, step 4: acquiring a pressure difference value between pressure taking ports in a pipeline;
And 5: calculating EGR mass flow according to the temperature of the exhaust gas, the pressure of the exhaust gas in the pipeline and the pressure difference value between pressure taking ports in the pipeline;
Step 6: and (6) adjusting the exhaust gas air inflow according to the EGR mass flow, and repeating the step 6 until the EGR rate target value is met.
2. an exhaust gas recirculation system that measures an EGR rate, comprising:
The EGR valve is connected with an engine exhaust pipe and used for accessing engine exhaust gas;
An EGR cooler, the inlet end of the EGR cooler is connected with an EGR valve and is used for cooling the exhaust gas to below 250 ℃;
the air inlet end of the differential pressure generating device is connected with the outlet end of the EGR cooler, and the air outlet end of the differential pressure generating device is also connected with an air inlet connecting pipe of the engine and used for stabilizing the flow of the exhaust gas;
A temperature sensor arranged at an outlet end of the EGR cooler for acquiring an exhaust gas temperature;
The temperature sensor is arranged at the outlet end of the EGR cooler or the air outlet end of the differential pressure generation device and is used for acquiring the pressure of the exhaust gas in the pipeline;
And the differential pressure sensor is arranged on the differential pressure generating device and used for acquiring a differential pressure value between pressure taking ports in the pipeline.
3. The exhaust gas recirculation system for measuring an EGR rate as claimed in claim 1, wherein the differential pressure generating means is a venturi tube or an orifice plate.
4. the exhaust gas recirculation system measuring an EGR rate according to claim 3, wherein one end of the differential pressure sensor is disposed at a large diameter portion of the venturi tube, and the other end of the differential pressure sensor is disposed at a small diameter portion of the venturi tube.
5. the exhaust gas recirculation system for measuring an EGR rate according to claim 3, wherein one end of the differential pressure sensor is disposed at an inlet end of the orifice plate, and the other end of the differential pressure sensor is disposed at an outlet end of the orifice plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910883736.0A CN110566354A (en) | 2019-09-18 | 2019-09-18 | Exhaust gas recirculation system and method for measuring EGR rate |
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| CN201910883736.0A CN110566354A (en) | 2019-09-18 | 2019-09-18 | Exhaust gas recirculation system and method for measuring EGR rate |
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| CN110566354A true CN110566354A (en) | 2019-12-13 |
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| CN201910883736.0A Pending CN110566354A (en) | 2019-09-18 | 2019-09-18 | Exhaust gas recirculation system and method for measuring EGR rate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945327A (en) * | 2021-05-13 | 2021-06-11 | 西安多普多信息科技有限公司 | Mass flow detection method, device and system |
| CN113027626A (en) * | 2019-12-24 | 2021-06-25 | 一汽解放汽车有限公司 | EGR valve control system and control method thereof |
| CN114544185A (en) * | 2022-02-24 | 2022-05-27 | 安徽江淮汽车集团股份有限公司 | Engine EGR rate uniformity test system and test method |
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| CN207333057U (en) * | 2017-10-13 | 2018-05-08 | 中国第一汽车股份有限公司 | Integrated form Venturi tube |
| CN211174364U (en) * | 2019-09-18 | 2020-08-04 | 广西玉柴机器股份有限公司 | Exhaust gas recirculation system for measuring EGR rate |
-
2019
- 2019-09-18 CN CN201910883736.0A patent/CN110566354A/en active Pending
Patent Citations (7)
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| CN202900451U (en) * | 2012-10-19 | 2013-04-24 | 东风汽车有限公司 | EGR mixer for EGR engine |
| CN103114916A (en) * | 2013-02-28 | 2013-05-22 | 长城汽车股份有限公司 | EGR (exhaust gas recirculation) control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027626A (en) * | 2019-12-24 | 2021-06-25 | 一汽解放汽车有限公司 | EGR valve control system and control method thereof |
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Application publication date: 20191213 |