CN111622867A - Exhaust gas recirculation system, method and vehicle - Google Patents
Exhaust gas recirculation system, method and vehicle Download PDFInfo
- Publication number
- CN111622867A CN111622867A CN202010515606.4A CN202010515606A CN111622867A CN 111622867 A CN111622867 A CN 111622867A CN 202010515606 A CN202010515606 A CN 202010515606A CN 111622867 A CN111622867 A CN 111622867A
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- Prior art keywords
- exhaust gas
- temperature
- gas recirculation
- recirculation system
- outlet
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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
- F02M26/22—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
- F02M26/33—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 controlling the temperature of the recirculated gases
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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
- F02M26/22—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
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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
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
Abstract
The invention discloses an exhaust gas recirculation system, a method and a vehicle, wherein the exhaust gas recirculation system comprises an exhaust gas recirculation valve, a temperature regulating device, a temperature detecting device and a control device, an air inlet for the entering of exhaust gas is formed in the input end of the exhaust gas recirculation valve, the temperature regulating device is installed at the output end of the exhaust gas recirculation valve and is used for regulating the temperature of the exhaust gas, an air outlet for the leaving of the exhaust gas is formed in the temperature regulating device, the temperature detecting device is used for detecting the temperature of the exhaust gas leaving from the air outlet, and the control device is electrically connected with the temperature regulating device and the temperature detecting device and is used for controlling the temperature regulating device according to the temperature of the exhaust gas detected by. The temperature regulating device of the invention has the function of regulating the temperature of the waste gas, can improve the temperature of the waste gas and reduce the temperature of the waste gas, thereby avoiding the reduction of the dynamic property of an engine caused by overhigh temperature of the waste gas and the formation of coking or condensation caused by overlow temperature of the waste gas.
Description
Technical Field
The invention relates to the technical field of automobile emission, in particular to an exhaust gas recirculation system, an exhaust gas recirculation method and a vehicle.
Background
In order to meet the Euro IV and Euro V emission requirements of light-duty diesel engines and reduce the NOx emission of automobiles, Exhaust Gas Recirculation (EGR) technology has become the standard for engines. Existing exhaust gas recirculation systems typically include a set of cooperating exhaust gas recirculation valves that control the amount of exhaust gas introduced into the cylinders and a cooler that cools the exhaust gas that is about to enter the cylinders. When the temperature of the exhaust gas at the air outlet of the cooler is too low, the exhaust gas is coked or condensed in the cooler, the cooler is corroded, and when the temperature of the exhaust gas is too high, the amount of the exhaust gas entering the engine is reduced, so that the power performance of the engine is reduced. Therefore, there is a need for an exhaust gas recirculation system and method with a proper exhaust gas recirculation valve and cooler, which can precisely and reasonably adjust the exhaust gas temperature to solve the above problems.
Disclosure of Invention
The invention mainly aims to provide an exhaust gas recirculation system, an exhaust gas recirculation method and a vehicle, and aims to solve the problem that in the existing exhaust gas recirculation technology, an exhaust gas recirculation valve and a cooler are matched properly to accurately and reasonably adjust the temperature of exhaust gas.
To achieve the above object, the present invention provides an exhaust gas recirculation system including:
the input end of the exhaust gas recirculation valve is provided with an air inlet for the entry of exhaust gas;
the temperature adjusting device is arranged at the output end of the exhaust gas recirculation valve and used for adjusting the temperature of the exhaust gas, and the temperature adjusting device is provided with an air outlet through which the exhaust gas leaves;
temperature detection means for detecting a temperature of the exhaust gas exiting from the gas outlet; and the number of the first and second groups,
and the control device is electrically connected with the temperature adjusting device and the temperature detecting device and is used for controlling the temperature adjusting device according to the temperature of the waste gas detected by the temperature detecting device.
Optionally, the temperature adjusting device includes a heater and a cooler sequentially arranged along the flow direction of the exhaust gas, the heater is installed at the output end of the exhaust gas recirculation valve, and the air outlet is provided in the cooler.
Optionally, the cooler includes a cooling water path, a water inlet and a water outlet, the cooling water path extends along the flow direction of the exhaust gas and stores cooling water for cooling the exhaust gas, and the water inlet and the water outlet are communicated with the cooling water path and are respectively used for supplying the cooling water to enter and leave the cooling water path.
Optionally, the cooler further comprises a water inlet regulating valve arranged at the water inlet, and the water inlet regulating valve is electrically connected with the control device.
Optionally, the inlet regulating valve is an electrically controlled valve.
Optionally, the heater comprises a resistance wire electrically connected with the control device.
Furthermore, the present invention also proposes an exhaust gas recirculation method including:
detecting the exhaust gas temperature of an air outlet of the exhaust gas recirculation system to obtain a first air outlet exhaust gas temperature;
comparing the first outlet exhaust gas temperature with a preset temperature threshold, and controlling the temperature regulating device to reduce the exhaust gas temperature in the exhaust gas recirculation system when the first outlet exhaust gas temperature is higher than the preset temperature threshold;
and when the temperature of the exhaust gas at the first gas outlet is lower than the preset temperature threshold value, controlling the temperature adjusting device to increase the temperature of the exhaust gas in the exhaust gas recirculation system.
Optionally, the step of controlling the temperature adjustment device to increase the temperature of the exhaust gas in the exhaust gas recirculation system comprises:
reducing the opening degree of the water inlet regulating valve and reducing cooling water entering the cooler;
detecting the opening degree of the water inlet regulating valve, and when the opening degree of the water inlet regulating valve reaches a preset minimum opening degree, detecting the waste gas temperature of an air outlet of the waste gas recirculation system to obtain a second air outlet waste gas temperature;
and comparing the second gas outlet waste gas temperature with a preset temperature threshold value, and controlling the temperature adjusting device to increase the waste gas temperature in the waste gas recirculation system when the second gas outlet waste gas temperature is lower than the preset temperature threshold value.
Optionally, the preset temperature threshold is 115-125 ℃.
In addition, the invention also provides a vehicle, which comprises the exhaust gas recirculation system, wherein the exhaust gas recirculation system is mounted in an air inlet and exhaust system of the vehicle, and a control device in the exhaust gas recirculation system is electrically connected with an electronic controller unit of the vehicle.
In the technical scheme of the invention, the temperature regulating device has the function of regulating the temperature of the exhaust gas, can improve the temperature of the exhaust gas and also can reduce the temperature of the exhaust gas, thereby avoiding the reduction of the dynamic property of an engine caused by overhigh temperature of the exhaust gas and the coking or condensation caused by overlow temperature of the exhaust gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an exhaust gas recirculation system provided by the present invention;
FIG. 2 is a schematic flow diagram of an embodiment of a method of exhaust gas recirculation according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | Exhaust |
221 | |
| 11 | |
222 | Water inlet |
| 2 | Temperature regulating |
223 | Water outlet |
| 21 | |
224 | Water inlet regulating valve |
| 22 | |
100 | Exhaust gas recirculation system |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the existing exhaust gas recirculation system, when the temperature of exhaust gas at the air outlet of a cooler is too low, the exhaust gas is coked or condensed in the cooler to corrode the cooler, and when the temperature of the exhaust gas is too high, the amount of the exhaust gas entering an engine is reduced, so that the power performance of the engine is reduced. Therefore, it is desirable to provide an exhaust gas recirculation system with a proper combination of an exhaust gas recirculation valve and a cooler. To solve the above problem, the present invention provides an exhaust gas recirculation system 100, please refer to fig. 1, which is a specific embodiment of the exhaust gas recirculation system 100, wherein the exhaust gas recirculation system 100 includes an exhaust gas recirculation valve 1, a temperature adjustment device 2, a temperature detection device and a control device, an input end of the exhaust gas recirculation valve 1 is provided with an air inlet 11 for the entry of the exhaust gas, the temperature adjustment device 2 is installed at an output end of the exhaust gas recirculation valve 1 for adjusting the temperature of the exhaust gas, the temperature adjustment device 2 is provided with an air outlet 221 for the exit of the exhaust gas, the temperature detection device is used for detecting the temperature of the exhaust gas exiting from the air outlet 221, and the control device is electrically connected to the temperature adjustment device 2 and the temperature detection device for controlling the temperature adjustment device 2 according to the temperature of the exhaust gas detected by the temperature.
The exhaust gas recirculation system 100 of the present invention is suitable for use in an automotive air induction and exhaust system for reintroducing exhaust gas from an engine into the engine cylinders. Referring to fig. 1, the exhaust gas enters the inlet 11 along the arrow direction, and then exits from the outlet 221 and enters the engine cylinder, in the process, the temperature adjusting device 2 plays a role in adjusting the temperature of the exhaust gas, so as to increase the temperature of the exhaust gas and reduce the temperature of the exhaust gas, thereby avoiding the decrease of the power performance of the engine caused by the overhigh temperature of the exhaust gas and the formation of coking or condensation caused by the overlow temperature of the exhaust gas.
Temperature regulation apparatus 2 in this embodiment is controlled by controlling means, and before it adjusted the exhaust gas temperature, controlling means need receive temperature-detecting device earlier at the testing result of gas outlet 221, specifically can install temperature sensor additional in gas outlet 221 department, detects the temperature of exhaust gas at gas outlet 221 in real time, and this is comparatively common mode. In order to further enhance the reliability and the working efficiency of the exhaust gas recirculation system 100, the control device may further determine the exhaust gas temperature according to the working condition of the engine, that is, before the exhaust gas enters the air inlet 11, it may be determined that the exhaust gas temperature is about to generate the problem of overheating or overcooling, and the control device may control the temperature adjustment device 2 to increase or decrease the cooling strength of the temperature adjustment device 2 to the exhaust gas, so that the exhaust gas temperature at the air outlet 221 meets the requirement of the current working condition of the engine. Compared with the method that the exhaust gas temperature is detected at the gas outlet 221 and then feedback adjustment is carried out, the method is more advanced and more efficient in adjusting the exhaust gas temperature.
Further, the temperature adjusting device 2 includes a heater 21 and a cooler 22 sequentially disposed along the flow direction of the exhaust gas, the heater 21 is installed at the output end of the exhaust gas recirculation valve 1, and the air outlet 221 is disposed at the cooler 22. The temperature adjusting device 2 of the embodiment has a simple structure, and can accurately adjust the temperature of the exhaust gas.
Further, in the present embodiment, the heater 21 includes a resistance wire electrically connected to the control device, so that the cost is low and the working efficiency is high.
Further, the cooler 22 includes a cooling water path, a water inlet 222 and a water outlet 223, the cooling water path extends along the flowing direction of the exhaust gas and stores cooling water for cooling the exhaust gas, and the water inlet 222 and the water outlet 223 are communicated with the cooling water path and are respectively used for allowing the cooling water to enter and leave the cooling water path. Referring to fig. 1, the water inlet 222 is disposed at the bottom of the cooler 22 and closer to the air inlet 11, and the water outlet 223 is disposed at the upper portion of the cooler 22 and closer to the air outlet 221, so as to cool the exhaust gas more sufficiently.
In this embodiment, the cooler 22 further includes a water inlet adjusting valve 224 disposed at the water inlet 222, and the water inlet adjusting valve 224 is electrically connected to the control device. The water inlet regulating valve 224 in this embodiment is an electric control valve. Through adjusting the aperture of the water inlet regulating valve 224, the flow of cooling water can be controlled, that is, the cooling capacity of the cooler 22 is controlled, and compared with the exhaust gas recirculation system 100 with the unadjustable cooling capacity of the cooler 22, the present embodiment can avoid the exhaust gas from being excessively cooled, thereby avoiding the problem that the cooler 22 is blocked, corroded, leaked water or even failed in the engine due to coking or condensation acid liquid formed in the exhaust gas in the cooler 22.
Further, the present invention also proposes an exhaust gas recirculation method which is applicable to the exhaust gas recirculation system 100 in the embodiment of the present invention, the exhaust gas recirculation method including:
s100: detecting the exhaust gas temperature of the air outlet 221 of the exhaust gas recirculation system 100 to obtain the exhaust gas temperature of the first air outlet 221;
s200: comparing the exhaust gas temperature of the first air outlet 221 with a preset temperature threshold value, and controlling the temperature regulating device 2 to reduce the exhaust gas temperature in the exhaust gas recirculation system 100 when the exhaust gas temperature of the first air outlet 221 is higher than the preset temperature threshold value;
s300: when the exhaust gas temperature of the first air outlet 221 is lower than the preset temperature threshold value, the temperature regulating device 2 is controlled to increase the exhaust gas temperature in the exhaust gas recirculation system 100.
In the method of the present invention, the temperature of the exhaust gas in the exhaust gas recirculation system 100, specifically, the temperature of the exhaust gas flowing through the temperature adjustment device 2, can be increased or decreased, so as to avoid the decrease of the power performance of the engine caused by the excessively high temperature of the exhaust gas and the formation of coking or condensation caused by the excessively low temperature of the exhaust gas. In the embodiment, the range of the preset temperature threshold is 115-125 ℃ through experimental calculation.
Further, according to the exhaust gas recirculation system 100 in the embodiment of the present invention, the step of controlling the temperature adjustment device 2 to increase the temperature of the exhaust gas in the exhaust gas recirculation system 100 includes:
s310: the opening degree of the inlet regulating valve 224 is reduced, and the cooling water entering the cooler 22 is reduced;
s320: detecting the opening degree of the water inlet adjusting valve 224, and when the opening degree of the water inlet adjusting valve 224 reaches a preset minimum opening degree, detecting the exhaust gas temperature of the air outlet 221 of the exhaust gas recirculation system 100 to obtain the exhaust gas temperature of a second air outlet 221;
s330: and comparing the exhaust gas temperature of the second air outlet 221 with a preset temperature threshold value, and controlling the temperature regulating device 2 to increase the exhaust gas temperature in the exhaust gas recirculation system 100 when the exhaust gas temperature of the second air outlet 221 is lower than the preset temperature threshold value.
Since the temperature control device 2 includes both the heater 21 and the cooler 22, there are various methods for increasing the exhaust gas temperature in the exhaust gas recirculation system 100. In this embodiment, the heater 21 may be turned on at the same time, and the opening degree of the inlet regulating valve 224 may be decreased to decrease the cooling intensity of the exhaust gas by the temperature adjusting device 2, or the cooling intensity of the exhaust gas may be decreased by decreasing the amount of the cooling water without turning on the heater 21 first, in this case, there is a possibility that the cooling water in the cooler 22 boils, causing failure and leakage of the cooler 22, and therefore, the opening degree of the water inlet adjusting valve 224 in the present embodiment is preset to a minimum opening degree, when the preset minimum opening degree is reached, the exhaust gas temperature of the air outlet 221 of the exhaust gas recirculation system 100 is detected again, the exhaust gas temperature of the second air outlet 221 is obtained, the exhaust gas temperature of the second air outlet 221 is compared with a preset temperature threshold value, when the exhaust gas temperature at the second gas outlet 221 is lower than the preset temperature threshold value, the temperature adjusting device 2 is controlled to heat the exhaust gas, so as to further increase the exhaust gas temperature in the exhaust gas recirculation system 100.
In addition, the invention also provides a vehicle, which comprises the exhaust gas recirculation system 100, wherein the exhaust gas recirculation system 100 is installed in an air inlet and exhaust system of the vehicle, and a control device in the exhaust gas recirculation system 100 is electrically connected with an electronic controller unit of the vehicle. The vehicle can avoid the reduction of the dynamic property of the engine caused by overhigh temperature of the exhaust gas and the formation of coking or condensation caused by overhigh temperature of the exhaust gas.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An exhaust gas recirculation system, comprising:
the input end of the exhaust gas recirculation valve is provided with an air inlet for the entry of exhaust gas;
the temperature adjusting device is arranged at the output end of the exhaust gas recirculation valve and used for adjusting the temperature of the exhaust gas, and the temperature adjusting device is provided with an air outlet through which the exhaust gas leaves;
temperature detection means for detecting a temperature of the exhaust gas exiting from the gas outlet; and the number of the first and second groups,
and the control device is electrically connected with the temperature adjusting device and the temperature detecting device and is used for controlling the temperature adjusting device according to the temperature of the waste gas detected by the temperature detecting device.
2. The exhaust gas recirculation system according to claim 1, wherein the temperature adjustment device includes a heater and a cooler arranged in this order in a flow direction of the exhaust gas, the heater is mounted to an output end of the exhaust gas recirculation valve, and the outlet is provided to the cooler.
3. The exhaust gas recirculation system according to claim 2, wherein the cooler includes a cooling water path extending in a flow direction of the exhaust gas and storing cooling water for cooling the exhaust gas, a water inlet and a water outlet communicating with the cooling water path and respectively for the cooling water to enter and exit the cooling water path.
4. The exhaust gas recirculation system of claim 3, wherein the cooler further comprises a water inlet regulating valve disposed at the water inlet, the water inlet regulating valve being electrically connected to the control device.
5. The exhaust gas recirculation system of claim 4, wherein the water inlet regulating valve is an electrically controlled valve.
6. The exhaust gas recirculation system of claim 2, wherein the heater comprises a resistive wire electrically connected to the control device.
7. An exhaust gas recirculation method, characterized by comprising:
detecting the exhaust gas temperature of an air outlet of the exhaust gas recirculation system to obtain a first air outlet exhaust gas temperature;
comparing the first outlet exhaust gas temperature with a preset temperature threshold, and controlling the temperature regulating device to reduce the exhaust gas temperature in the exhaust gas recirculation system when the first outlet exhaust gas temperature is higher than the preset temperature threshold;
and when the temperature of the exhaust gas at the first gas outlet is lower than the preset temperature threshold value, controlling the temperature adjusting device to increase the temperature of the exhaust gas in the exhaust gas recirculation system.
8. The exhaust gas recirculation method according to claim 7, wherein the step of controlling the temperature adjustment device to increase the temperature of the exhaust gas in the exhaust gas recirculation system includes:
reducing the opening degree of the water inlet regulating valve and reducing cooling water entering the cooler;
detecting the opening degree of the water inlet regulating valve, and when the opening degree of the water inlet regulating valve reaches a preset minimum opening degree, detecting the waste gas temperature of an air outlet of the waste gas recirculation system to obtain a second air outlet waste gas temperature;
and comparing the second gas outlet waste gas temperature with a preset temperature threshold value, and controlling the temperature adjusting device to increase the waste gas temperature in the waste gas recirculation system when the second gas outlet waste gas temperature is lower than the preset temperature threshold value.
9. The exhaust gas recirculation method according to claim 7, wherein the preset temperature threshold is in a range of 115 to 125 ℃.
10. A vehicle comprising an exhaust gas recirculation system according to any one of claims 1-6, the exhaust gas recirculation system being mounted in an intake and exhaust system of the vehicle, and control means in the exhaust gas recirculation system being electrically connected to an electronic control unit of the vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010515606.4A CN111622867A (en) | 2020-06-05 | 2020-06-05 | Exhaust gas recirculation system, method and vehicle |
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| CN202010515606.4A CN111622867A (en) | 2020-06-05 | 2020-06-05 | Exhaust gas recirculation system, method and vehicle |
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| CN111622867A true CN111622867A (en) | 2020-09-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322586A (en) * | 2022-01-14 | 2022-04-12 | 厦门冉能环保科技有限公司 | Laboratory sintering tail gas clean-up system |
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| CN114322586A (en) * | 2022-01-14 | 2022-04-12 | 厦门冉能环保科技有限公司 | Laboratory sintering tail gas clean-up system |
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Application publication date: 20200904 |
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