CN112282981A - Engine system with EGR valve cleaning and method for reducing EGR valve icing - Google Patents
Engine system with EGR valve cleaning and method for reducing EGR valve icing Download PDFInfo
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- CN112282981A CN112282981A CN202010981373.7A CN202010981373A CN112282981A CN 112282981 A CN112282981 A CN 112282981A CN 202010981373 A CN202010981373 A CN 202010981373A CN 112282981 A CN112282981 A CN 112282981A
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- egr valve
- valve
- engine
- egr
- engine system
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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
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention belongs to the technical field of vehicle systems, and particularly relates to an engine system for cleaning an EGR valve and a method for reducing the icing of the EGR valve. The engine system for cleaning the EGR valve comprises a gas circulation system, a recirculation system and a deicing system, wherein the gas circulation system comprises an air inlet throttle valve, an air cylinder body, an exhaust pipe, an exhaust butterfly valve and a post-processing device which are sequentially arranged, the recirculation system comprises the EGR valve, one end of the EGR valve is communicated with the air inlet end of the air cylinder body, the other end of the EGR valve is communicated with the air outlet end of the exhaust pipe, the deicing system comprises a control valve, one end of the control valve is communicated with the air inlet end of the post-processing device, the other end of the control valve is communicated with the air outlet end of the EGR valve, and the control valve is used for controlling the on. Through using the engine system who cleans the EGR valve among this technical scheme, open the control valve after shutting down and can clean the inside comdenstion water of EGR valve through the flow of inertia gas circuit, reduce the condition that the EGR valve freezes.
Description
Technical Field
The invention belongs to the technical field of vehicle systems, and particularly relates to an engine system for cleaning an EGR valve and a method for reducing the icing of the EGR valve.
Background
In a local cold area, after flameout and stop of an engine using the exhaust gas recirculation system, because the environment temperature is low and a large number of water molecules exist in exhaust gas generated by combustion in a cylinder, the EGR valve and the connecting pipeline can generate condensed water in the cooling process of the flameout engine, the condensed water is further frozen under the influence of a low-temperature environment, and a kinematic pair of the EGR valve cannot normally work after being frozen. In cold regions, exhaust gas cannot circulate after the EGR valve is frozen, ice can be melted only by heat radiation generated by the engine, the time required in the process is relatively long, and the risk of the original exhaust of the engine exceeding the limit is high.
Disclosure of Invention
The invention aims to at least solve the problem of icing of an EGR valve after a vehicle is shut down in a low-temperature environment. The purpose is realized by the following technical scheme:
a first aspect of the present invention provides an engine system that cleans an EGR valve, comprising:
the gas circulating system comprises a gas inlet throttle valve, a cylinder body, an exhaust pipe, an exhaust butterfly valve and a post-processing device which are arranged in sequence;
a recirculation system including an EGR valve, one end of the EGR valve being communicated with an intake end of the cylinder block, the other end of the EGR valve being communicated with an outlet end of the exhaust pipe;
the device is characterized by further comprising a deicing system, wherein the deicing system comprises a control valve, one end of the control valve is communicated with the air inlet end of the aftertreatment device, the other end of the control valve is communicated with the air outlet end of the EGR valve, and the control valve is used for controlling the on-off state of the deicing system.
Through using the engine system who cleans the EGR valve among this technical scheme, engine shutdown work after the flameout is stopped, but because inertial action still can exist and breathe in and exhaust process, open the control valve among the deicing system this moment and can change original engine system's gas flow direction, clean the inside comdenstion water of EGR valve through the flow of inertia gas circuit, reduce the condition that the EGR valve freezes, improved the reliability of engine.
In addition, the engine system for cleaning the EGR valve can also have the following additional technical characteristics:
in some embodiments of the invention, the control valve is a solenoid valve that is connected to the engine ECU.
In some embodiments of the invention, the engine system scavenging the EGR valve further comprises a temperature sensor for monitoring the temperature of the external environment.
In some embodiments of the invention, the engine system scavenging the EGR valve further comprises a rotational speed sensor for monitoring the rotational speed of the engine.
In some embodiments of the present invention, the exhaust gas recirculation system further includes a venturi tube, one end of the venturi tube being communicated with the outlet end of the EGR valve, and the other end of the venturi tube being communicated with the inlet end of the cylinder block.
In some embodiments of the present invention, the air circulation system further includes an air cleaner, one end of which communicates with an air inlet end of the air inlet throttle valve, and the other end of which communicates with the outside.
In some embodiments of the invention, the gas circulation system further comprises a fuel injector located on the cylinder block.
The invention also provides a method for reducing the icing of the EGR valve, which is implemented according to the engine system for cleaning the EGR valve, and comprises the following steps:
acquiring the temperature of the external environment;
when the external environment temperature is lower than a preset value, an engine ECU controls an air inlet throttle valve, an electromagnetic valve and an EGR valve of the engine system for cleaning the EGR valve to be opened, and controls an exhaust butterfly valve and an oil injector to be closed;
acquiring the rotating speed of an engine;
and controlling the electromagnetic valve to be closed according to the rotation speed equal to 0, and executing a conventional flameout program by the engine.
In some embodiments of the present invention, the obtaining of the external environment temperature further includes:
and executing a conventional flameout program by the engine according to the condition that the outside temperature is higher than or equal to the preset value.
In some embodiments of the invention, the obtaining of the engine speed further comprises:
and keeping the air inlet throttle valve, the electromagnetic valve and the EGR valve open and keeping the exhaust butterfly valve and the fuel injector closed according to the condition that the rotating speed of the engine is greater than 0.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates an overall system diagram of an engine system purging an EGR valve, according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates control logic for a method of reducing EGR valve icing according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
FIG. 1 schematically illustrates an overall system diagram of an engine system that cleans an EGR valve, according to an embodiment of the present invention. As shown in FIG. 1, the present invention provides an engine system with an EGR valve cleaned and a method for reducing the icing of the EGR valve. The engine system for cleaning the EGR valve comprises a gas circulation system, a recirculation system and a deicing system, wherein the gas circulation system comprises an air inlet throttle valve, a cylinder body, an exhaust pipe, an exhaust butterfly valve and a post-processing device which are sequentially arranged, the recirculation system comprises the EGR valve, one end of the EGR valve is communicated with the air inlet end of the cylinder body, the other end of the EGR valve is communicated with the air outlet end of the exhaust pipe, the deicing system comprises a control valve, one end of the control valve is communicated with the air inlet end of the post-processing device, the other end of the control valve is communicated with the air outlet end of the EGR valve, and the control valve is used for controlling the on.
Through using the engine system who cleans the EGR valve among this technical scheme, engine shutdown work after the flameout is stopped, but because inertial action still can exist and breathe in and exhaust process, open the control valve among the deicing system this moment and can change original engine system's gas flow direction, clean the inside comdenstion water of EGR valve through the flow of inertia gas circuit, reduce the condition that the EGR valve freezes, improved the reliability of engine.
Further, in the embodiment, the control valve is an electromagnetic valve, and the electromagnetic valve is connected with the engine ECU, so that the on-off operation of the deicing system can be rapidly performed according to the control instruction of the engine, and the intelligence and the reliability are improved. In other embodiments, the control valve may be any valve body capable of controlling on-off states, including mechanical valves and electrically controlled valves.
Further, in this embodiment, the engine system for purging the EGR valve further includes a temperature sensor for monitoring the temperature of the external environment, and the engine ECU can obtain the temperature of the external environment at the initial stage of the engine shutdown, so as to perform the next step of operation.
Further, in the present embodiment, the engine system for cleaning the EGR valve further includes a rotation speed sensor, the rotation speed sensor is configured to monitor a rotation speed of the engine, and after controlling each component to operate, the rotation speed of the engine is used as a determination reference cone for controlling the valve to be closed, so that the cleaning of the EGR valve body and the closing operation of the deicing system can be accurately performed.
Further, in the present embodiment, the exhaust gas recirculation system further includes a venturi tube, one end of the venturi tube communicates with the air outlet end of the EGR valve, and the other end of the venturi tube communicates with the air inlet end of the cylinder block. After stopping to spray diesel oil, the engine can carry out the shut down operation, because the inertial action of engine can still have in the jar and breathe in and the exhaust process, the pressure resistance that venturi's throat structure makeed venturi department is very big for gas flows along the dotted line in figure 1, and then cleans the inside steam of EGR valve, has reduced the condition that the EGR valve freezes.
Specifically, in the present embodiment, the gas circulation system further includes an air cleaner, one end of which communicates with the intake end of the intake throttle valve, and the other end of which communicates with the outside. The air filter can filter out dust and sand in the air, and ensures that sufficient and clean air enters the cylinder block.
Specifically, in the present embodiment, the gas circulation system further includes an injector, which is located on the cylinder block, for adjusting the rotation speed and power of the engine.
Specifically, in the present embodiment, the gas circulation system further includes a supercharger, a pressure end of which is located between the air cleaner and the intake throttle valve, and a scroll end of which is located between the exhaust pipe and the exhaust butterfly valve. The supercharger contributes to an increase in the amount of intake air to the engine, thereby increasing the power and combustion efficiency of the engine.
Further, the operation flow of the present embodiment is: as shown in fig. 2, after receiving a flameout instruction, the engine ECU determines the external environment temperature through the temperature sensor, and if the external environment temperature is lower than a preset value, the opening of the intake throttle valve is adjusted to be fully open, and the EGR valve and the electromagnetic valve are opened simultaneously to close the fuel injector and the exhaust butterfly valve. After the diesel fuel injection is stopped, the engine is stopped, and the inertia after the stop can still cause the processes of air suction and air exhaust in the cylinder. Since there is no combustion and the venturi's throat structure makes the pressure resistance at the venturi extremely large, the gas entering the engine interior is mostly fresh air drawn through the air cleaner, and circulates along the dashed arrows in fig. 2. When fresh air in the cylinder passes through the EGR valve and the electromagnetic valve, because the gas flow velocity is high, waste gas existing in the EGR valve and the EGR pipeline can be flushed into the exhaust tail pipe and the post-processing device, and the water vapor purging is completed. When the engine speed is detected to be 0, the electric control valves are reset, and the engine executes a conventional flameout program.
Specifically, in the present embodiment, the gas in the EGR valve and the pipe after the shutdown is fresh air, the air temperature in the cold region is low, the relative humidity is also low, and the moisture content is extremely low because the gas is not involved in combustion, and the EGR valve cannot be frozen at ambient temperature.
The invention also provides a method for reducing the icing of the EGR valve, which is implemented according to the engine system for cleaning the EGR valve and comprises the following steps:
acquiring the temperature of the external environment;
when the external environment temperature is lower than a preset value, an engine ECU controls an air inlet throttle valve, an electromagnetic valve and an EGR valve of an engine system for cleaning the EGR valve to be opened, and controls an exhaust butterfly valve and an oil injector to be closed, wherein the gas flow direction of the engine system is shown by a dotted line in figure 1;
acquiring the rotating speed of an engine;
according to the rotation speed equal to 0, the electromagnetic valve is controlled to be closed, and the engine executes a conventional flameout program.
In some embodiments of the present invention, obtaining the external environment temperature further comprises:
and executing a conventional flameout program by the engine according to the condition that the outside temperature is higher than or equal to the preset value.
In some embodiments of the present invention, obtaining the rotational speed of the engine further comprises:
and keeping the air inlet throttle valve, the electromagnetic valve and the EGR valve open and keeping the exhaust butterfly valve and the fuel injector closed according to the condition that the rotating speed of the engine is greater than 0.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An engine system for scavenging an EGR valve, comprising:
the gas circulating system comprises a gas inlet throttle valve, a cylinder body, an exhaust pipe, an exhaust butterfly valve and a post-processing device which are arranged in sequence;
a recirculation system including an EGR valve, one end of the EGR valve being communicated with an intake end of the cylinder block, the other end of the EGR valve being communicated with an outlet end of the exhaust pipe;
the device is characterized by further comprising a deicing system, wherein the deicing system comprises a control valve, one end of the control valve is communicated with the air inlet end of the aftertreatment device, the other end of the control valve is communicated with the air outlet end of the EGR valve, and the control valve is used for controlling the on-off state of the deicing system.
2. The engine system of scavenging EGR valve of claim 1, characterized in that the control valve is a solenoid valve connected to the engine ECU.
3. The engine system with scavenging EGR valve of claim 1, further comprising a temperature sensor for monitoring the temperature of the external environment.
4. The engine system with scavenging EGR valve of claim 1, further comprising a rotational speed sensor for monitoring the rotational speed of the engine.
5. The engine system of scavenging the EGR valve of claim 1, wherein the exhaust gas recirculation system further comprises a venturi, one end of the venturi communicating with the outlet end of the EGR valve, the other end of the venturi communicating with the inlet end of the cylinder block.
6. The engine system that cleans an EGR valve according to claim 1, characterized in that the gas circulation system further includes an air cleaner, one end of which communicates with an intake end of the intake throttle valve, and the other end of which communicates with the outside.
7. The engine system clearing an EGR valve as in claim 1, wherein said gas circulation system further comprises an injector located on said cylinder block.
8. A method of reducing EGR valve icing, the method implemented according to the engine system of any of claims 1-7 purging an EGR valve, comprising:
acquiring the temperature of the external environment;
when the external environment temperature is lower than a preset value, an engine ECU controls an air inlet throttle valve, an electromagnetic valve and an EGR valve of the engine system for cleaning the EGR valve to be opened, and controls an exhaust butterfly valve and an oil injector to be closed;
acquiring the rotating speed of an engine;
and controlling the electromagnetic valve to be closed according to the rotation speed equal to 0, and executing a conventional flameout program by the engine.
9. The method of reducing EGR valve icing of claim 8, wherein said deriving ambient temperature further comprises:
and executing a conventional flameout program by the engine according to the condition that the outside temperature is higher than or equal to the preset value.
10. The method of reducing EGR valve icing of claim 8, wherein said deriving engine speed further comprises:
and keeping the air inlet throttle valve, the electromagnetic valve and the EGR valve open and keeping the exhaust butterfly valve and the fuel injector closed according to the condition that the rotating speed of the engine is greater than 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010981373.7A CN112282981B (en) | 2020-09-17 | 2020-09-17 | Engine system with EGR valve cleaning and method for reducing EGR valve icing |
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| CN202010981373.7A CN112282981B (en) | 2020-09-17 | 2020-09-17 | Engine system with EGR valve cleaning and method for reducing EGR valve icing |
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| CN112282981B CN112282981B (en) | 2021-12-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576382A (en) * | 2021-03-01 | 2021-03-30 | 潍柴动力股份有限公司 | Purging control method and device for engine |
| CN114033586A (en) * | 2021-10-26 | 2022-02-11 | 东风汽车集团股份有限公司 | Throttle valve ice breaking method and device |
| CN115478945A (en) * | 2022-08-16 | 2022-12-16 | 潍柴动力股份有限公司 | Control method and device for exhaust gas recirculation system, electronic device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112576382A (en) * | 2021-03-01 | 2021-03-30 | 潍柴动力股份有限公司 | Purging control method and device for engine |
| CN114033586A (en) * | 2021-10-26 | 2022-02-11 | 东风汽车集团股份有限公司 | Throttle valve ice breaking method and device |
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| CN115478945B (en) * | 2022-08-16 | 2023-12-15 | 潍柴动力股份有限公司 | Control method and device of exhaust gas recirculation system, electronic equipment and storage medium |
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| CN112282981B (en) | 2021-12-21 |
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