CN114060182A - Engine with EGR system, control method and vehicle - Google Patents

Engine with EGR system, control method and vehicle Download PDF

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Publication number
CN114060182A
CN114060182A CN202010771616.4A CN202010771616A CN114060182A CN 114060182 A CN114060182 A CN 114060182A CN 202010771616 A CN202010771616 A CN 202010771616A CN 114060182 A CN114060182 A CN 114060182A
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CN
China
Prior art keywords
engine
egr
way valve
exhaust manifold
catalyst
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010771616.4A
Other languages
Chinese (zh)
Inventor
张小坤
姚博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Zhenyu New Energy Power Technology Co Ltd
Original Assignee
Shenzhen Zhenyu New Energy Power Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Zhenyu New Energy Power Technology Co Ltd filed Critical Shenzhen Zhenyu New Energy Power Technology Co Ltd
Priority to CN202010771616.4A priority Critical patent/CN114060182A/en
Publication of CN114060182A publication Critical patent/CN114060182A/en
Pending legal-status Critical Current

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    • 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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
    • 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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers

Abstract

The invention discloses an engine with an EGR system, a control method and a vehicle, wherein the engine comprises: an engine block having a plurality of cylinders therein, the engine block having an intake manifold and an exhaust manifold; an EGR assembly, one end of the EGR assembly communicating with the exhaust manifold; the exhaust gas purification device comprises a three-way valve and a catalyst, wherein an air inlet of the three-way valve is communicated with an exhaust manifold, and a first air outlet and a second air outlet of the three-way valve are respectively communicated with the other end of the EGR assembly and the catalyst so that the exhaust gas in the exhaust manifold can selectively enter the catalyst or the EGR assembly. Therefore, the engine can be rapidly ignited, the exhaust emission under the idling and starting working conditions can be ensured to meet the use requirements, the engine can run in a low-temperature state, and the EGR assembly is controlled to intervene in the working process of the engine after the temperature of the catalyst is high and the engine is switched to the medium-high speed working condition, so that the application range of the engine is expanded.

Description

Engine with EGR system, control method and vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to an engine with an EGR system, a control method and a vehicle.
Background
In the related art, with the high requirements of oil consumption and emission regulations, particularly the national six-emission indexes, the implementation is started, and the requirements on the oil consumption and the emission regulations are metFurther demands are made on engine fuel consumption reduction and emission reduction, and the application of Exhaust Gas Recirculation (EGR) can effectively reduce engine NOXAnd (4) discharging.
The EGR system is mixed with fresh gas and then enters a combustion chamber by reintroducing the waste gas of the engine into the gas inlet system, and the inlet gas temperature of the engine is integrally increased due to high temperature of the waste gas in the gas mixing process.
With conventional exhaust gas recirculation systems, exhaust gas flows out of the exhaust pipe and is cooled by an EGR cooler. And the cooled exhaust gas is regulated and controlled by an EGR valve, and the amount of the exhaust gas entering an air inlet pipe is regulated. When the EGR rate is too large, combustion instability may occur.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to propose an engine with an EGR system which makes it possible to reduce NO in the exhaust gasesXUnder the premise of the discharge amount of the diesel engine, the diesel engine can be quickly ignited.
The application further provides a control method of the engine.
The present application further provides a vehicle.
An engine having an EGR system according to an embodiment of the first aspect of the invention includes: an engine block having a plurality of cylinders therein, the engine block having an intake manifold and an exhaust manifold; an EGR assembly having one end in communication with the exhaust manifold; the exhaust gas purification device comprises a three-way valve and a catalyst, wherein an air inlet of the three-way valve is communicated with the exhaust manifold, and a first air outlet and a second air outlet of the three-way valve are respectively communicated with the other end of the EGR assembly and the catalyst so that the exhaust gas in the exhaust manifold can selectively enter the catalyst or the EGR assembly.
According to the engine with the EGR system, the three-way valve is arranged, so that when a vehicle is in a starting and idling working condition, the EGR component is controlled not to be involved in the working process of the engine, the engine is ensured to be rapidly ignited, and the exhaust emission meets the use requirement through the catalyst with the rapidly increased temperature; when the vehicle is in a medium-high speed working condition, the exhaust gas is recycled through the EGR component, and the emission of the exhaust gas can meet the use requirement.
In conclusion, by arranging the three-way valve, the engine can be rapidly ignited, the exhaust emission under the idling and starting working conditions can meet the use requirements, the engine can run at a low temperature state, and after the temperature of the catalyst is high and the engine is switched to the medium-high working condition, the EGR assembly is controlled to intervene in the working process of the engine, the application range of the engine is improved, and the exhaust emission can not meet the use requirements under the medium-high working condition can be avoided.
According to some embodiments of the invention, the engine further comprises: and one end of the turbocharger is connected with the exhaust manifold, and the other end of the turbocharger is communicated with the intake manifold.
In some embodiments, the three-way valve is disposed in parallel with the turbocharger and both communicate with the exhaust manifold.
In some embodiments, an intake intercooler is further disposed between the turbocharger and the intake manifold.
In some embodiments, the EGR assembly comprises: EGR valve and EGR cooler, the three-way valve with EGR cooler intercommunication, EGR cooler with EGR valve intercommunication, the EGR valve with intake manifold intercommunication.
Further, the EGR cooler is configured as a water-cooled cooler.
A control method of an engine according to an embodiment of the second aspect of the invention includes: acquiring the working condition of a vehicle; and if the vehicle is in a starting working condition or an idling working condition, controlling the three-way valve to enable the exhaust manifold to be communicated with the catalyst.
Further, the control method further includes: and if the vehicle is in a medium-high speed working condition, controlling the three-way valve to enable the exhaust manifold to be communicated with the EGR assembly.
According to a vehicle of an embodiment of a third aspect of the invention, comprising: the engine control system comprises a memory, a processor and a control program stored on the memory and capable of running on the processor, wherein when the processor executes the control program, the control method of the engine is realized so as to control the engine.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic illustration of an engine according to an embodiment of the present invention.
Reference numerals:
the engine (100) is provided with a motor,
an engine body 10, an intake manifold 11, an exhaust manifold 12,
an EGR assembly 20, an EGR valve 21, an EGR cooler 22,
three-way valve 30, catalyst 40, turbocharger 50, intake intercooler 60, air cleaner 70, bypass valve 80.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
An engine 100 having an EGR system, a control method, and a vehicle according to an embodiment of the invention are described below with reference to fig. 1.
As shown in fig. 1, an engine 100 having an EGR system according to an embodiment of the first aspect of the invention includes: an engine body 10 having a plurality of cylinders therein, the engine body 10 having an intake manifold 11 and an exhaust manifold 12; an EGR assembly 20, one end of the EGR assembly 20 communicating with the exhaust manifold 12; the exhaust gas purification device comprises a three-way valve 30 and a catalyst 40, wherein an air inlet of the three-way valve 30 is communicated with the exhaust manifold 12, and a first air outlet and a second air outlet of the three-way valve 30 are respectively communicated with the other end of the EGR assembly 20 and the catalyst 40 so that the exhaust gas in the exhaust manifold 12 can selectively enter the catalyst 40 or the EGR assembly 20.
Specifically, the intake manifold 11 is adapted to provide compressed air to the cylinders for combustion of the fuel mixture in the cylinders, and exhaust gas generated by combustion of the fuel mixer in the cylinders is introduced into the exhaust manifold 12, and the exhaust gas in the exhaust manifold 12 may flow into the EGR valve 21 assembly through the first outlet of the three-way valve 30 or into the catalyst 40 through the second outlet.
Furthermore, when the engine 100 of the present application is in the starting condition or the idling condition, the exhaust gas in the exhaust manifold 12 directly enters the catalyst 40, and is discharged to the atmosphere after being treated in the catalyst 40, so that the starting condition and the idling condition can be avoided, the exhaust gas enters the intake manifold 11 through the EGR assembly 20, so that the EGR rate in the cylinder is zero, so that under the idling condition and the starting condition, the fuel mixture in the cylinder can be stably combusted at a low level, so that the engine 100 can be rapidly ignited, and meanwhile, the high-temperature exhaust gas directly enters the catalyst 40, so that the temperature inside the catalyst 40 can be rapidly increased, so that the exhaust emission of the engine 100 meets the use requirements under the idling and starting conditions ensured by the catalyst 40.
When the engine 100 is in a medium-high rotating speed working condition, the exhaust gas in the exhaust manifold 12 directly enters the EGR assembly 20 and further enters the intake manifold 11, so that the exhaust gas is recycled through the EGR assembly 20, and NO in the exhaust gas is effectively reducedxThe content of the tail gas meets the use requirement under the medium-high speed working condition.
According to the engine 100 with the EGR system, when the vehicle is in a starting and idling working condition, the three-way valve 30 is arranged to control the EGR component 20 not to be involved in the working process of the engine 100, so that the engine 100 can be started quickly, and exhaust emission can meet the use requirement through the catalyst 40 with the temperature rising quickly; when the vehicle is in a medium-high speed working condition, the exhaust gas is recycled through the EGR component 20, and the emission of the exhaust gas can meet the use requirement.
In summary, by setting the three-way valve 30, the engine 100 can be started quickly, the exhaust emission under the idle speed and start-up working condition can be ensured to meet the use requirement, the engine 100 can be operated under the low-temperature state, and the EGR assembly 20 is controlled to intervene in the working process of the engine 100 after the temperature of the catalyst 40 is high and the engine 100 is switched to the medium-high speed working condition, so that the application range of the engine 100 is improved, and the exhaust emission can be prevented from not meeting the use requirement under the medium-high speed working condition.
As shown in fig. 1, according to some embodiments of the invention, engine 100 further comprises: and the turbocharger 50, wherein one end of the turbocharger 50 is connected with the exhaust manifold 12, the other end of the turbocharger 50 is communicated with the intake manifold 11, and the three-way valve 30 and the turbocharger 50 are arranged in parallel and are communicated with the exhaust manifold 12.
Specifically, the operation of the engine 100 of the present application is as follows: the compressed air and the fuel gas enter a cylinder to be sufficiently mixed and then combusted, exhaust gas generated by combustion enters the exhaust manifold 12, part of the exhaust gas in the exhaust manifold 12 enters the turbocharger 50 to realize turbocharging of air at the air inlet side, the exhaust gas in the turbocharger 50 flows out of the turbocharger 50, flows into the catalyst 40 and is discharged after being processed in the catalyst 40, and the other part of the exhaust gas in the exhaust manifold 12 enters the three-way valve 30 and enters the EGR assembly 20 or enters the catalyst 40 according to the working condition of the engine 100.
Thus, by providing the turbocharger 50, the fresh air on the intake side can be effectively turbocharged so that more fresh air is present in the cylinder to make the combustion 0 of the fuel gas in the cylinder more sufficient.
In some embodiments, an intake intercooler 60 is also provided between the turbocharger 50 and the intake manifold 11. Thus, the temperature of the supercharged fresh air is reduced by the intake intercooler 60, so that the compressed fresh air can enter the cylinder at a lower temperature to avoid the temperature of the gas entering the cylinder from being too high, and the combustion stability of the engine 100 is improved.
In some embodiments, the EGR assembly 20 comprises: the EGR valve 21 and the EGR cooler 22 are connected to each other, the three-way valve 30 is connected to the EGR cooler 22, the EGR cooler 22 is connected to the EGR valve 21, and the EGR valve 21 is connected to the intake manifold 11.
Specifically, the EGR cooler 22 may cool the exhaust gas that is recycled, and the opening degree of the EGR valve 21 may be adjusted, so that the EGR rate in the cylinder meets the use requirement, the EGR rate in the cylinder is prevented from being too high, the combustion stability in the cylinder is maintained, and the knocking phenomenon during the combustion process in the cylinder is prevented.
Further, the EGR cooler 22 is configured as a water-cooled cooler. This can improve the cooling effect on the exhaust gas to ensure an appropriate temperature of the exhaust gas entering the cylinder.
It is understood that the engine 100 further includes: an air cleaner 70 provided on the intake side for filtering air taken into the intake manifold 11, and a bypass valve 80 provided in parallel with the intake turbine of the turbocharger 50 for opening when the intake back pressure is too high, to ensure that the intake air amount of the engine 100 can be maintained stable.
A control method of engine 100 according to an embodiment of the second aspect of the invention includes: acquiring the working condition of a vehicle; if the vehicle is in a start-up condition or an idle condition, controlling the three-way valve 30 to communicate the exhaust manifold 12 with the catalyst 40; if the vehicle is in a medium to high speed condition, the three-way valve 30 is controlled to communicate the exhaust manifold 12 with the EGR assembly 20.
That is, the control method of the engine 100 of the present application may control the three-way valve 30 to communicate the exhaust manifold 12 with the EGR assembly 20 or directly with the catalyst 40 according to the operating condition of the engine 100, to improve the combustion stability of the engine 100, and to allow the engine 100 to be used in a lower temperature environment.
According to a vehicle of an embodiment of a third aspect of the invention, comprising: the control system comprises a memory, a processor and a control program stored on the memory and capable of running on the processor, wherein when the processor executes the control program, the control method of the engine 100 is realized so as to control the engine 100.
According to the vehicle of the embodiment of the present invention, the engine 100 is controlled by the control method, and the technical effect is the same as that of the engine 100, which is not described herein again.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.
In the description of the present invention, "a plurality" means two or more.
In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.
In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. An engine having an EGR system, comprising:
an engine block having a plurality of cylinders therein, the engine block having an intake manifold and an exhaust manifold;
an EGR assembly having one end in communication with the exhaust manifold;
the exhaust gas purification device comprises a three-way valve and a catalyst, wherein an air inlet of the three-way valve is communicated with the exhaust manifold, and a first air outlet and a second air outlet of the three-way valve are respectively communicated with the other end of the EGR assembly and the catalyst so that the exhaust gas in the exhaust manifold can selectively enter the catalyst or the EGR assembly.
2. The engine with an EGR system of claim 1, further comprising: and one end of the turbocharger is connected with the exhaust manifold, and the other end of the turbocharger is communicated with the intake manifold.
3. The engine with an EGR system of claim 2 wherein the three-way valve is disposed in parallel with the turbocharger and both communicate with the exhaust manifold.
4. The engine with an EGR system of claim 2 wherein an intake charge air cooler is further disposed between the turbocharger and the intake manifold.
5. The engine having an EGR system of claim 2, wherein the EGR assembly comprises: EGR valve and EGR cooler, the three-way valve with EGR cooler intercommunication, EGR cooler with EGR valve intercommunication, the EGR valve with intake manifold intercommunication.
6. The engine with an EGR system of claim 5, wherein the EGR cooler is configured as a water cooled cooler.
7. A control method of an engine, characterized by comprising:
acquiring the working condition of a vehicle;
and if the vehicle is in a starting working condition or an idling working condition, controlling the three-way valve to enable the exhaust manifold to be communicated with the catalyst.
8. The control method of an engine according to claim 7, characterized by further comprising:
and if the vehicle is in a medium-high speed working condition, controlling the three-way valve to enable the exhaust manifold to be communicated with the EGR assembly.
9. A vehicle, characterized by comprising: a memory, a processor and a control program stored on the memory and operable on the processor, when executing the control program, implementing a method of controlling an engine as claimed in any one of claims 7 to 8 to control an engine as claimed in any one of claims 1 to 6.
CN202010771616.4A 2020-08-04 2020-08-04 Engine with EGR system, control method and vehicle Pending CN114060182A (en)

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CN202010771616.4A CN114060182A (en) 2020-08-04 2020-08-04 Engine with EGR system, control method and vehicle

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Application Number Priority Date Filing Date Title
CN202010771616.4A CN114060182A (en) 2020-08-04 2020-08-04 Engine with EGR system, control method and vehicle

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CN114060182A true CN114060182A (en) 2022-02-18

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007192153A (en) * 2006-01-20 2007-08-02 Hino Motors Ltd Egr device
US20170002774A1 (en) * 2015-06-30 2017-01-05 Southwest Research Institute Internal Combustion Engine Having Six Cylinders With Two of the Cylinders Being Dedicated EGR Cylinders Controlled With Dual EGR Valve
CN107542605A (en) * 2016-06-28 2018-01-05 长城汽车股份有限公司 Triple valve and vehicle for D-EGR systems
CN107849970A (en) * 2015-05-26 2018-03-27 天纳克有限责任公司 Egr system with particulate filter and waste gate
CN108506119A (en) * 2017-02-24 2018-09-07 联合汽车电子有限公司 External exhaust gas recirculation system and its working method
CN209604167U (en) * 2019-02-25 2019-11-08 东风汽车集团有限公司 EGR exhaust recirculating system with exhaust gas bypass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007192153A (en) * 2006-01-20 2007-08-02 Hino Motors Ltd Egr device
CN107849970A (en) * 2015-05-26 2018-03-27 天纳克有限责任公司 Egr system with particulate filter and waste gate
US20170002774A1 (en) * 2015-06-30 2017-01-05 Southwest Research Institute Internal Combustion Engine Having Six Cylinders With Two of the Cylinders Being Dedicated EGR Cylinders Controlled With Dual EGR Valve
CN107542605A (en) * 2016-06-28 2018-01-05 长城汽车股份有限公司 Triple valve and vehicle for D-EGR systems
CN108506119A (en) * 2017-02-24 2018-09-07 联合汽车电子有限公司 External exhaust gas recirculation system and its working method
CN209604167U (en) * 2019-02-25 2019-11-08 东风汽车集团有限公司 EGR exhaust recirculating system with exhaust gas bypass

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