CN113494389A - Low pressure exhaust gas recirculation system - Google Patents
Low pressure exhaust gas recirculation system Download PDFInfo
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- CN113494389A CN113494389A CN202010270900.3A CN202010270900A CN113494389A CN 113494389 A CN113494389 A CN 113494389A CN 202010270900 A CN202010270900 A CN 202010270900A CN 113494389 A CN113494389 A CN 113494389A
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- pipeline
- gas recirculation
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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
- F02M26/02—EGR systems specially adapted for supercharged engines
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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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/18—Thermal insulation or heat protection
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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
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
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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
- F02M26/45—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
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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
- F02M26/65—Constructional details of EGR valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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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)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a low-pressure exhaust gas recirculation system, which comprises a low-pressure exhaust gas recirculation pipeline, wherein one end of the low-pressure exhaust gas recirculation pipeline is connected to a fresh air inlet pipeline, and the other end of the low-pressure exhaust gas recirculation pipeline is connected to the other end of an exhaust pipeline and is used for reintroducing part of exhaust gas in the exhaust pipeline into the inlet pipeline; a low-pressure exhaust gas recirculation valve and a temperature sensor are sequentially arranged on the low-pressure exhaust gas recirculation pipeline; an external pressure relief valve is arranged on the air inlet bypass pipeline, and the opening duration of the external pressure relief valve is executed through an instruction of an engine controller. While a temperature sensor is arranged on the low-pressure exhaust gas recirculation line. This temperature sensor is responsible for judging opening and long time of the external relief valve of the bypass pipeline that admits air, produces the comdenstion water when preventing preceding waste gas of booster and cold air mixture, avoids assaulting the compressor impeller of booster, causes the harm.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a low-pressure exhaust gas recirculation system.
Background
To meet increasingly stringent fuel consumption and emission regulations, LP-EGR (Low-pressure exhaust gas recirculation) technology is increasingly applied to gasoline engines. The LP-EGR of the gasoline engine can effectively reduce the oil consumption, inhibit the knocking and lighten the enrichment. However, the LP-EGR exhaust gas has a high water vapor content, and when the high-humidity LP-EGR gas is first cooled by an EGR cooler (low-pressure exhaust gas recirculation cooler), condensed water is generated, and when the LP-EGR gas is mixed with cold air before the supercharger, the condensed water is also generated and exists in the form of droplets, and particularly in winter, the inlet air temperature is low, and the droplets may freeze, impact the supercharger compressor impeller, and cause damage.
Disclosure of Invention
The invention aims to solve the problem that condensed water generated in an LP-EGR system in the prior art freezes to damage a supercharger compressor impeller.
In order to solve the above technical problem, an embodiment of the present invention discloses a low pressure exhaust gas recirculation system for reintroducing part of exhaust gas generated by an engine into the engine, the low pressure exhaust gas recirculation system including: the air inlet pipeline is connected with an air inlet of the engine and is used for introducing fresh air or waste gas into the interior of the engine; the system comprises an air inlet pipeline, an air outlet pipeline, a fresh air inlet pipeline, a supercharger, an air inlet bypass pipeline and a fresh air inlet pipeline, wherein the air inlet pipeline comprises an air inlet main pipeline and an air inlet bypass pipeline, one end of the air inlet main pipeline is communicated with the fresh air inlet pipeline, the other end of the air inlet main pipeline is communicated with an air inlet of the engine, the air inlet main pipeline is connected with a supercharging port of the supercharger, one end of the air inlet bypass pipeline is connected to the air inlet main pipeline and is positioned between the supercharging port of the supercharger and the air inlet, and the other end of the air inlet bypass pipeline is connected to the fresh air inlet pipeline;
the exhaust pipeline is connected with an exhaust port of the engine and used for leading exhaust gas generated by the engine out of the engine, wherein the exhaust pipeline comprises an exhaust main pipeline and an exhaust bypass pipeline, one end of the exhaust main pipeline is communicated with the exhaust port of the engine, and the exhaust main pipeline is connected with the catalytic bag; the exhaust main pipeline is connected with a turbine port of a supercharger, one end of the exhaust bypass pipeline is connected to the exhaust main pipeline and is positioned between the turbine port of the supercharger and an exhaust port, and the other end of the exhaust bypass pipeline is connected to the exhaust main pipeline and is positioned on a pipeline between the turbine port of the supercharger and the catalytic bag;
the low-pressure exhaust gas recirculation pipeline is connected with the fresh air inlet pipeline at one end, is connected with the exhaust main pipeline at the other end, is positioned between the catalytic package and the other end of the exhaust main pipeline, and is used for introducing part of exhaust gas in the exhaust pipeline into the inlet pipeline; a low-pressure exhaust gas recirculation valve and a temperature sensor are sequentially arranged on the low-pressure exhaust gas recirculation pipeline;
an external pressure relief valve is arranged on the air inlet bypass pipeline; an electric control air release valve is arranged on the air outlet bypass pipeline;
the engine controller acquires a pressure relief signal and controls the working state of the low-pressure exhaust gas recirculation system according to the pressure relief signal;
wherein, the pressure release signal includes: the opening signal of the low-pressure exhaust gas recirculation valve, the temperature signal of the temperature sensor and the opening signal of the electric control air release valve.
By adopting the technical scheme, the air inlet bypass pipeline is provided with the external pressure relief valve, and the opening time of the external pressure relief valve is executed through the instruction of the engine controller. While a temperature sensor is arranged on the low-pressure exhaust gas recirculation line. The temperature sensor is responsible for judging the opening and the duration of the external pressure release valve of the air inlet bypass pipeline, so that condensed water is prevented from being produced when the front waste gas of the air compressor is mixed with cold air, and the impeller of the air compressor of the supercharger is prevented from being impacted to cause damage.
According to another specific embodiment of the present invention, the low-pressure exhaust gas recirculation system disclosed in the embodiments of the present invention, when the engine controller detects that the opening signal of the low-pressure exhaust gas recirculation valve is equal to zero, the low-pressure exhaust gas recirculation system is in a closed state; and when the engine controller detects that the opening signal of the low-pressure exhaust gas recirculation valve is not equal to zero, the low-pressure exhaust gas recirculation system is in a working state.
According to another embodiment of the present invention, the low-pressure exhaust gas recirculation system is disclosed, wherein when the low-pressure exhaust gas recirculation system is in an operating state:
the engine controller acquires a temperature signal:
when the temperature signal is smaller than a preset low-temperature threshold value, the engine controller controls the external pressure relief valve to open;
when the temperature signal is greater than or equal to the preset low-temperature threshold value, the engine controller controls the external pressure relief valve to close.
According to another specific embodiment of the invention, in the low-pressure exhaust gas recirculation system disclosed by the embodiment of the invention, when the engine controller controls the external relief valve to open, the engine controller controls the opening degree of the electronic control relief valve to decrease.
According to another embodiment of the present invention, the low pressure egr system further includes a low pressure egr cooler disposed on the low pressure egr line for cooling the exhaust gas flowing through the low pressure egr line.
According to another embodiment of the present invention, the low pressure exhaust gas recirculation system further comprises a pressure sensor disposed on the low pressure exhaust gas recirculation pipeline.
According to another embodiment of the present invention, the low pressure exhaust gas recirculation system further includes an intercooler disposed on the intake line near the engine controller.
The invention has the beneficial effects that:
the invention provides a low-pressure exhaust gas recirculation system, which comprises a low-pressure exhaust gas recirculation pipeline, a fresh air inlet pipeline, a fresh air outlet pipeline and a fresh air inlet pipeline, wherein one end of the low-pressure exhaust gas recirculation pipeline is connected to the fresh air inlet pipeline, and the other end of the low-pressure exhaust gas recirculation pipeline is connected to a downstream pipeline of an exhaust pipeline and is used for introducing part of exhaust gas in the exhaust pipeline into the fresh air inlet pipeline; a low-pressure exhaust gas recirculation valve and a temperature sensor are sequentially arranged on the low-pressure exhaust gas recirculation pipeline; an air inlet bypass pipeline is further arranged on the air inlet pipeline, an external pressure release valve is arranged on the air inlet bypass pipeline, and the opening duration of the external pressure release valve is executed through an instruction of an engine controller. While a temperature sensor is arranged on the low-pressure exhaust gas recirculation line. The temperature sensor is responsible for judging the opening and the duration of the external pressure release valve of the air inlet bypass pipeline, so that condensed water is prevented from being produced when the front waste gas of the air compressor is mixed with cold air, and the impeller of the air compressor of the supercharger is prevented from being impacted to cause damage.
Drawings
FIG. 1 is a schematic diagram of a low pressure EGR system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary embodiment of a low pressure EGR system;
fig. 3 is a flowchart illustrating a method for controlling a low pressure egr system according to an embodiment of the present invention.
Description of reference numerals:
110. an air intake line;
1101. a pressure relief valve is arranged outside;
1102. an intake bypass line;
1103. a main intake air line;
120. an engine;
1201. an air inlet;
1202. an exhaust port;
130. an exhaust line;
1301. a downstream pipeline;
1302. an upstream line;
1303. an outlet bypass line;
140. an electrically controlled air release valve;
150. a low pressure exhaust gas recirculation line;
1501. a low pressure exhaust gas recirculation valve;
1502. a temperature sensor;
160. an engine controller;
170. a fresh air intake line;
180. a low pressure exhaust gas recirculation cooler;
190. a pressure sensor;
200. an intercooler;
210. a supercharger;
2101. an air inlet of the compressor;
2102. an air outlet of the air compressor;
2103. a turbine air inlet;
2104. a turbine outlet;
220. and (4) catalyzing and packaging.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
In order to solve the problem that condensed water generated in the LP-EGR system freezes and damages the compressor impeller of the supercharger in the prior art, as shown in fig. 1 to 3, the embodiment of the present embodiment discloses a low-pressure exhaust gas recirculation system for reintroducing part of exhaust gas generated by the engine into the engine, wherein the low-pressure exhaust gas recirculation system includes an intake pipeline 110, an exhaust pipeline 130, and a low-pressure exhaust gas recirculation pipeline 150. The intake pipe 110 is connected to an intake port 1201 of the engine 120 for introducing fresh air or exhaust gas into the interior of the engine 120; the intake pipeline 110 includes an intake main pipeline 1103 and an intake bypass pipeline 1102, one end of the intake main pipeline 1103 is communicated with the fresh air intake pipeline 170, the other end of the intake main pipeline 1103 is communicated with the air inlet 1201 of the engine 120, the intake main pipeline 1103 is connected with the supercharging port of the supercharger 210, one end of the intake bypass pipeline 1102 is connected to the intake main pipeline 1103 and is located between the supercharging port of the supercharger 210 and the air inlet 1201, and the other end of the intake bypass pipeline 1102 is connected to the fresh air intake pipeline 170.
The exhaust pipeline 130 is connected with an exhaust port 1202 of the engine 120 and is used for leading the exhaust gas generated by the engine 120 out of the engine 120, wherein the exhaust pipeline 130 comprises an exhaust main pipeline and an exhaust bypass pipeline 1303, one end of the exhaust main pipeline is communicated with the exhaust port 1202 of the engine 120, and the exhaust main pipeline is connected with the catalytic bag 220; the exhaust main pipeline is connected with a turbine port of the supercharger 210, one end of the exhaust bypass pipeline 1303 is connected with the exhaust main pipeline and is positioned between the turbine port of the supercharger 210 and the exhaust port 1202, and the other end of the exhaust bypass pipeline 1303 is connected with the exhaust main pipeline and is positioned on a pipeline between the turbine port of the supercharger 210 and the catalytic bag 220.
A low pressure exhaust gas recirculation line 150 having one end connected to the fresh air intake line 170 and the other end connected to the exhaust main line 130 at a position between the catalytic package and the other end of the exhaust main line for introducing a portion of the exhaust gas in the exhaust line 130 into the intake line 110; the low-pressure egr pipe 150 is provided with a low-pressure egr valve 1501 and a temperature sensor 1502 in this order.
An external pressure relief valve 1101 is arranged on the air inlet bypass pipeline 1102; an electric control air release valve 140 is arranged on the air outlet bypass pipeline 1303;
the engine controller 160 acquires the pressure relief signal and controls the working state of the low-pressure exhaust gas recirculation system according to the pressure relief signal;
wherein, the pressure release signal includes: an opening degree signal of the low-pressure exhaust gas recirculation valve 1501, a temperature signal of the temperature sensor 1502 and an opening degree signal of the electronically controlled purge valve 140.
More specifically, the boost ports of the supercharger 210 include a compressor inlet 2101, a compressor outlet 2102, and the turbine ports include a turbine inlet 2103 and a turbine outlet 2104.
As shown in fig. 1, specifically, a compressor air inlet 2101 is communicated with a fresh air inlet pipeline 170 shown in fig. 1, and a compressor air outlet 2102 is communicated with an inlet main pipeline 1103, wherein one end of the inlet main pipeline 1103 is communicated with the compressor air outlet 2102, and the other end is communicated with an air inlet 1201 of the engine 120. Additionally, an intake bypass conduit 1102 is defined having one end in communication with fresh air intake conduit 170 and another end disposed on intake main conduit 1103 and in communication with intake main conduit 1103.
The exhaust pipeline 130 is provided with an exhaust main pipeline and an outlet bypass pipeline 1303 shown in fig. 1, one end of an upstream pipeline 1302 of the exhaust main pipeline is communicated with an air outlet 1202 of the engine 120, the other end of the upstream pipeline is communicated with a turbine air inlet 2103, and a pipeline at the left end of a turbine air outlet 2104 shown in fig. 1 is defined as a downstream pipeline 1301 of the exhaust pipeline 130; the bypass vent 1303 has one end connected to the upstream pipe 1302 of the exhaust pipe 130, and the other end connected to the downstream pipe 1301, so that a part of the exhaust gas discharged from the engine 120 enters the supercharger 210 through the upstream pipe 1302 and then enters the downstream pipe 1301, and a part of the exhaust gas passes through the bypass vent 1303 and directly enters the downstream pipe 1301 without passing through the supercharger 210. In addition, the electronic control air release valve 140 is arranged on the air outlet bypass pipeline 1303.
One end of the low-pressure exhaust gas recirculation line 150 is communicated with the downstream line 1301, the other end is communicated with the fresh air inlet line 170 in a crossing manner, and the air entering from the fresh air inlet line 170, the high-temperature gas entering from the inlet bypass line 1102 and the exhaust gas entering from the low-pressure exhaust gas recirculation line 150 are collected at the crossing point, and the three gases are mixed and enter the supercharger 210 through the compressor air inlet 2101.
Specifically, an external relief valve 1101 is provided in the intake bypass line 1102, and the opening period of the external relief valve 1101 is executed by an instruction from the engine controller 160. A temperature sensor 1502 is also arranged on the low-pressure exhaust gas recirculation line 150. The temperature sensor 1502 is responsible for judging the opening and duration of the external pressure release valve 1101 of the air inlet bypass pipeline 1102, so that condensed water is prevented from being generated when exhaust gas and cold air are mixed in front of the supercharger 210, and the compressor impeller of the supercharger 210 is prevented from being impacted to cause damage.
Specifically, the temperature sensor 1502 is responsible for determining the temperature of the low-pressure exhaust gas recirculation line 150, and when the temperature is lower than a preset low-temperature threshold value, condensed water may be generated when the exhaust gas is mixed with cold air, so that the condensed water impacts a compressor impeller of the supercharger 210, and damages are caused. Therefore, when the temperature is judged to be lower than the preset low-temperature threshold value, the temperature information is sent to the engine controller 160, so that the external pressure relief valve 1101 is controlled to be opened, high-temperature gas formed by pressurization and heating after passing through the supercharger 210 is circulated and flows through the supercharger 210 again through the intake bypass pipeline 1102 where the external pressure relief valve 1101 is located, and waste gas in the low-temperature low-pressure waste gas recirculation system is prevented from being cooled before the supercharger 210 to generate condensed water; when the temperature sensor 1502 determines that the temperature of the low-pressure egr line 150 is not lower than the preset low-temperature threshold, the external pressure relief valve 1101 is closed. Wherein the preset low temperature threshold value will be specifically defined below.
In addition, the external relief valve 1101 is a relief valve commonly used in the prior art, and a model thereof is specifically selected according to actual needs, which is not specifically limited in this embodiment. The temperature sensor 1502 may be of the type: the PT100 may be of other models, which are specifically selected according to actual needs, and this embodiment is not specifically limited to this.
In addition, a downstream pipe 1301 of the exhaust pipe 130 is further provided with a catalytic bag 220 for converting harmful gases such as carbon monoxide emitted from the exhaust gas into nitrogen gas, thereby reducing emission pollution.
According to another specific embodiment of this embodiment, as shown in fig. 1, the embodiment of this embodiment discloses a low pressure egr system, wherein the pressure relief signal comprises: an opening degree signal of the low-pressure exhaust gas recirculation valve 1501, a temperature signal of the temperature sensor 1502 and an opening degree signal of the electronically controlled purge valve 140.
Specifically, the low pressure egr valve 1501 sends an opening signal of the low pressure egr valve 1501 to the engine controller 160; temperature sensor 1502 sends a temperature signal to engine controller 160; the electronically controlled purge valve 140 sends an opening signal of the electronically controlled purge valve 140 to the engine controller 160, and the engine controller 160 controls the operating state of the low pressure egr system based on the opening signal of the low pressure egr valve 1501, the temperature signal of the temperature sensor 1502, and the opening signal of the electronically controlled purge valve 140. The specific control process will be described in detail below.
In addition, the model of the electronically controlled purge valve 140 may be: Q921F-16S may be of other types, which are specifically selected according to actual needs, and this embodiment is not specifically limited to this. The electric motor controller 160 may be of the type: the MRS16 may also be of other types, which is specifically selected according to actual needs, and this embodiment is not specifically limited to this.
As shown in fig. 1, according to another specific embodiment of this embodiment, in the low-pressure egr system disclosed in this embodiment, when the engine controller 160 detects that the opening signal of the low-pressure egr valve 1501 is equal to zero, the low-pressure egr system is in a closed state; when the engine controller 160 detects that the opening signal of the low-pressure egr valve 1501 is not equal to zero, the low-pressure egr valve is in an operating state.
As shown in fig. 1, according to another specific embodiment of this embodiment, the embodiment of this embodiment discloses a low-pressure exhaust gas recirculation system, when the low-pressure exhaust gas recirculation system is in an operating state: the engine controller 160 acquires the temperature signal: when the temperature signal is less than the preset low-temperature threshold, it should be understood that the preset low-temperature threshold may be set to 0 degree celsius, and it is determined that the temperature of the circulating gas in the exhaust gas in the low-pressure exhaust gas recirculation system is low at this time, the engine controller 160 controls the external pressure relief valve 1101, and the external pressure relief valve 1101 circulates the high-temperature gas formed by pressurization and heating of the supercharger 210 through the intake bypass pipeline 1102 where the external pressure relief valve 1101 is located again and flows through the supercharger 210, so as to prevent the exhaust gas in the low-temperature low-pressure exhaust gas recirculation system from being cooled before the supercharger 210 to generate condensed water, which exists in the form of droplets, and particularly, the intake temperature in winter is low, and the droplets may freeze and impact the compressor impeller of the supercharger 210 to cause damage. When the temperature signal is greater than the preset low-temperature threshold value, it is determined that the temperature in the exhaust gas in the low-pressure exhaust gas recirculation system is not too low at this time, and at this time, the external pressure relief valve 1101 may be controlled to close.
In addition, the preset low pressure threshold may also be determined according to a temperature required when the exhaust gas in the low pressure exhaust gas recirculation system is condensed to form condensed water, which is not specifically limited in this embodiment.
Moreover, the electronic control air release valve 140 is responsible for directly discharging the exhaust gas generated by the engine 120 without passing through the supercharger 210, so that the pressure of the supercharger 210 is ensured to be stable, and the turbine blade of the supercharger 210 can be adjusted not to rotate too fast to achieve the self-destruction speed. In addition, when the engine controller 160 controls the external relief valve 1101 to open, since a part of gas flows back to the intake bypass pipeline 1102 to reduce the pressure of the gas entering the engine 120, in order to avoid that the rotation speed and the intake air amount of the supercharger 210 are affected by the excessively small intake air amount, the opening degree of the electronic control bleed valve 1505 can be controlled to be reduced through the engine controller 160, so that the exhaust power of the electronic control bleed valve 140 is gradually reduced, the gas discharged from the exhaust pipeline 130 enters the supercharger 210, the rotation speed of the supercharger 210 is increased to improve the intake air amount of the gas sucked from an air port (namely, a fresh air intake pipeline 170) below, and therefore the supercharging loss when the external relief valve 1101 is opened is compensated.
As shown in fig. 1, according to another specific embodiment of this embodiment, in the low pressure egr system disclosed in this embodiment, a low pressure egr cooler 180 is further disposed on the low pressure egr line 150 for cooling the exhaust gas flowing through the low pressure egr line 150, preventing the high temperature exhaust gas from reacting with the air input at one end of the intake line 110 to generate moisture, and preventing the moisture from generating condensed water when the moisture is mixed with the cool air before the supercharger 210. These condensate water exists in the form of droplets, which may freeze, especially in winter when the inlet air temperature is low, and may impact the compressor wheel of the supercharger 210, causing damage.
As shown in fig. 1, according to another specific embodiment of this embodiment, in the low pressure egr system disclosed in this embodiment, a pressure sensor 190 is further disposed on the low pressure egr line 150 for measuring the flow rate or pressure of the exhaust gas flowing through the low pressure egr line 150, so as to determine whether it meets the requirement of the supercharger 210 for air intake. The pressure sensor 190 may be of the type: the HM10 may be of other types, which is specifically selected according to actual needs, and this embodiment is not specifically limited in this respect.
As shown in fig. 1, according to another specific embodiment of this embodiment, in the low pressure exhaust gas recirculation system disclosed in this embodiment, an intercooler 200 is further disposed on the intake line near the engine controller 160, and the engine controller 160 controls the opening or closing of the external relief valve 1101 according to a temperature signal. When the gas enters the supercharger 210 for supercharging, the temperature of the gas is greatly increased, the density is correspondingly increased, the intercooler 200 plays a role in cooling, and the high-temperature gas is cooled by the intercooler 200 and then enters the engine 120. If the intercooler 200 is not provided and the pressurized high-temperature air directly enters the engine 120, the engine 120 may be damaged or even shut down due to the high air temperature. The model of the intercooler 200 may be: 1622318800, other models may be used, which are specifically selected according to actual needs, and this embodiment is not specifically limited to this.
As shown in fig. 1, according to another specific embodiment of the present embodiment, the embodiment of the present embodiment discloses a low pressure exhaust gas recirculation system, and the supercharger 210 may be of the type: a3960905 may be of other types, which is specifically selected according to actual needs, and this embodiment is not specifically limited to this.
As shown in fig. 1, according to another specific embodiment of this embodiment, in the low-pressure exhaust gas recirculation system disclosed in the embodiment of this embodiment, a fresh air intake line 170 is further connected to one end of the intake line 110, and a compressor intake 2101 of the supercharger 210 is communicated with the fresh air intake line 170 to receive fresh air and exhaust gas from the fresh air intake line 220 for compression, so as to improve the oxygen content of the mixture and improve the combustion efficiency, thereby inputting compressed gas to an intake 1201 of the engine 120.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (7)
1. A low pressure exhaust gas recirculation system for reintroducing a portion of exhaust gas produced by an engine into an interior of the engine, the low pressure exhaust gas recirculation system comprising:
an intake line connected to an intake port of the engine for introducing fresh air and/or exhaust gas into an interior of the engine; the air inlet pipeline comprises an air inlet main pipeline and an air inlet bypass pipeline, one end of the air inlet main pipeline is communicated with a fresh air inlet pipeline, the other end of the air inlet main pipeline is communicated with the air inlet of the engine, the air inlet main pipeline is connected with a supercharging port of a supercharger, one end of the air inlet bypass pipeline is connected to the air inlet main pipeline and is positioned between the supercharging port of the supercharger and the air inlet, and the other end of the air inlet bypass pipeline is connected to the fresh air inlet pipeline;
an exhaust line connected to an exhaust port of the engine, for leading out exhaust gas generated by the engine to the outside of the engine; the exhaust pipeline comprises an exhaust main pipeline and an exhaust bypass pipeline, one end of the exhaust main pipeline is communicated with the exhaust port of the engine, and a catalytic bag is arranged on the exhaust main pipeline; the exhaust main pipeline is connected with a turbine port of the supercharger, one end of the air outlet bypass pipeline is connected to the exhaust main pipeline and is positioned between the turbine port of the supercharger and the exhaust port, and the other end of the air inlet bypass pipeline is connected to the exhaust main pipeline and is positioned on a pipeline between the turbine port of the supercharger and the catalytic bag;
a low-pressure exhaust gas recirculation pipeline, one end of which is connected to a fresh air inlet pipeline, the other end of which is connected to the exhaust main pipeline, and the low-pressure exhaust gas recirculation pipeline is positioned between the catalytic package and the other end of the exhaust main pipeline and is used for introducing part of exhaust gas in the exhaust pipeline into the inlet pipeline; a low-pressure exhaust gas recirculation valve and a temperature sensor are sequentially arranged on the low-pressure exhaust gas recirculation pipeline;
an external pressure relief valve is arranged on the air inlet bypass pipeline; an electric control air release valve is arranged on the air outlet bypass pipeline;
an engine controller acquires a pressure relief signal and controls the working state of the low-pressure exhaust gas recirculation system according to the pressure relief signal;
wherein the pressure relief signal comprises: the opening signal of the low-pressure exhaust gas recirculation valve, the temperature signal of the temperature sensor and the opening signal of the electronic control air release valve.
2. The low pressure exhaust gas recirculation system of claim 1,
when the engine controller detects that the opening degree signal of the low-pressure exhaust gas recirculation valve is equal to zero, the low-pressure exhaust gas recirculation valve is in a closed state;
and when the engine controller detects that the opening signal of the low-pressure exhaust gas recirculation valve is not equal to zero, the low-pressure exhaust gas recirculation system is in a working state.
3. The low pressure exhaust gas recirculation system of claim 2, wherein, in the operating state:
the engine controller acquires the temperature signal:
when the temperature signal is smaller than a preset low-temperature threshold value, the engine controller controls the external pressure relief valve to be opened;
and when the temperature signal is greater than or equal to a preset low-temperature threshold value, the engine controller controls the external pressure relief valve to close.
4. The low pressure exhaust gas recirculation system of claim 3, wherein the engine controller controls the opening of the electronically controlled purge valve to decrease when the engine controller controls the externally mounted relief valve to open.
5. The low pressure exhaust gas recirculation system of claim 1, wherein a low pressure exhaust gas recirculation cooler is further provided on the low pressure exhaust gas recirculation line for cooling exhaust gas flowing through the low pressure exhaust gas recirculation line.
6. The low pressure exhaust gas recirculation system of claim 1, wherein a pressure sensor is further disposed on the low pressure exhaust gas recirculation line.
7. The low pressure exhaust gas recirculation system of claim 1, wherein an intercooler is further provided on the intake line adjacent to the engine controller.
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| CN202010270900.3A CN113494389B (en) | 2020-04-08 | 2020-04-08 | Low-pressure exhaust gas recirculation system |
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| CN114320677A (en) * | 2022-01-14 | 2022-04-12 | 安徽江淮汽车集团股份有限公司 | Low pressure EGR water heating structure |
| CN116220975A (en) * | 2023-02-03 | 2023-06-06 | 重庆赛力斯新能源汽车设计院有限公司 | Engine and vehicle with same |
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| CN113494389B (en) | 2022-11-01 |
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