CN111255596A - Engine assembly and vehicle with EGR system - Google Patents
Engine assembly and vehicle with EGR system Download PDFInfo
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- CN111255596A CN111255596A CN201811457106.9A CN201811457106A CN111255596A CN 111255596 A CN111255596 A CN 111255596A CN 201811457106 A CN201811457106 A CN 201811457106A CN 111255596 A CN111255596 A CN 111255596A
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- Prior art keywords
- cooler
- engine
- exhaust gas
- egr system
- air
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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
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
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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
- F02M26/32—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
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/021—Cooling cylinders
Abstract
The invention discloses an engine assembly with an EGR system and a vehicle, wherein the engine assembly comprises: an engine having a throttle and an exhaust manifold; a cooler having a cooler air inlet connected to the exhaust manifold and a cooler exhaust outlet connected to the throttle valve, the cooler being adapted to cool at least a portion of the exhaust gas discharged from the exhaust manifold to precipitate moisture from the exhaust gas and to direct the precipitated moisture into the interior of the cylinder of the engine. According to the engine assembly with the EGR system, condensed water can be fully separated out in the cooling process of waste gas, no water can be separated out before the condensed water enters the engine, the collected cooling water enters the engine in a gas form, the combustion of the engine under a small load is facilitated, liquid water can be effectively prevented from entering the engine, and the combustion efficiency of the engine is improved.
Description
Technical Field
The invention relates to the field of vehicles, in particular to an engine assembly with an EGR system and a vehicle.
Background
The engine EGR system is external EGR, and exhaust gas after a catalyst is introduced into an engine cylinder through a supercharger, an intake intercooler and a throttle valve before being introduced into an intake supercharger. After the waste gas is cooled by intercooling, a lot of water is separated out. The cooled EGR is below 40 ℃ at its cooler exit temperature. Much lower than conventional EGR70-150 ℃. However, water drops are formed after the exhaust gas is cooled at low temperature, and if the water enters the engine in a liquid state, the friction of a valve seat ring is increased, the friction of a piston and a cylinder wall is increased, and the service life of the engine is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an engine assembly with an EGR system, which can sufficiently separate out condensed water during the cooling process of exhaust gas, ensure that no water is separated out before entering the engine, and the collected cooling water enters the engine in a gas form, so as to facilitate the combustion of the engine under a small load, effectively avoid liquid water entering the engine, and improve the combustion efficiency of the engine.
The invention also provides a vehicle with the engine assembly of the EGR system.
The engine assembly with a low-pressure EGR system according to the present invention includes: an engine having a throttle and an exhaust manifold; a cooler having a cooler air inlet connected to the exhaust manifold and a cooler exhaust outlet connected to the throttle valve, the cooler being adapted to cool at least a portion of the exhaust gas discharged from the exhaust manifold to precipitate moisture from the exhaust gas and to direct the precipitated moisture into the interior of the cylinder of the engine.
According to the engine with the EGR system, the cooler is arranged between the exhaust manifold of the engine and the throttle valve of the engine, so that gas in the EGR system, which needs to return to the engine again, can pass through the cooler, the exhaust gas is greatly cooled in the cooler to fully separate out moisture, liquid water cannot be generated subsequently, and the moisture cannot enter the cylinder body of the engine, so that the engine works stably, friction between a piston and a cylinder wall is prevented from being increased due to the fact that the moisture enters the cylinder body in the engine, and the service life of the engine is prolonged.
According to one embodiment of the invention, the engine assembly further comprises: booster and intercooler, the booster includes: the air conditioner comprises a volute and a pressure shell, wherein the volute defines a first air passage, the pressure shell defines a second air passage, one end of the first air passage is connected with an exhaust manifold of the engine, the other end of the first air passage is connected with an air inlet of a cooler, one end of the second air passage is connected with an air outlet of the cooler, the other end of the second air passage is connected with an air inlet of an intercooler, and an air outlet of the intercooler is connected with a throttle valve; the driving impeller is arranged in the first air passage, and the driven impeller is arranged in the second air passage.
According to one embodiment of the invention, a heating device is arranged between the cooler exhaust and the one end of the second gas duct, the heating device being adapted to heat the exhaust gases that have just passed the cooler.
According to one embodiment of the invention, the heating device comprises: the heat exchanger is provided with a first heat exchange channel and a second heat exchange channel, the first heat exchange channel is communicated with a cooling liquid channel in the engine, and the second heat exchange channel is connected with the cooler exhaust port; and the electric heater is suitable for secondarily heating the waste gas passing through the heat exchanger, an air inlet of the electric heater is communicated with the second heat exchange channel, and an air outlet of the electric heater is connected with one end of the second air channel.
According to one embodiment of the invention, the engine assembly further comprises: and the water inlet of the atomizer is connected with the condensed water outlet of the cooler.
According to one embodiment of the invention, the water outlet of the atomizer of the engine assembly is selectively in communication with a throttle valve of the engine.
According to one embodiment of the invention, the engine assembly further comprises: the water storage tank, the water inlet of water storage tank with the comdenstion water export of cooler links to each other, the delivery port of water storage tank with the water inlet of atomizer links to each other.
According to one embodiment of the invention, the cooling temperature of the intercooler for the gas is not less than the cooling temperature of the cooler for the exhaust gas.
According to one embodiment of the invention, the engine assembly further comprises: the liquid inlet of the radiator is connected with the liquid outlet of the cooler, and the liquid outlet of the radiator is connected with the liquid inlet of the cooler.
A vehicle according to an embodiment of the invention is briefly described below.
According to the vehicle provided with the engine assembly with the low-pressure EGR system, the vehicle is provided with the engine assembly with the low-pressure EGR system, so that the vehicle is good in power performance, high in reliability of the engine and long in service life.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic illustration of an engine assembly having a low pressure EGR system, according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a chiller according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a cooler according to an embodiment of the present invention;
fig. 4 is a sectional view taken along a-a of fig. 3.
Reference numerals:
the engine assembly (100) is provided with a motor,
an engine 110, a throttle valve 111, an exhaust manifold 112,
a cooler 120, a cooler exhaust port 121a, a cooler inlet port 122, a condensed water outlet port 123,
the number of the superchargers 130, the intercoolers 140,
a first air passage 151, a second air passage 152, a driving impeller 153, a driven impeller 154, a catalyst 155,
a heating device 160, a heat exchanger 161, a first heat exchange passage 161a, a second heat exchange passage 161b, an electric heater 162,
the water storage tank 170, the atomizer 180,
the heat sink 190, the fan 191,
an outer housing 11, an inner housing 12, a recess 121, a cooling chamber 101, a cooling fluid inlet 105, a cooling fluid outlet 106,
a water inlet 107.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
An EGR system is an exhaust gas recirculation system of a vehicle, and after fuel is combusted in an engine, a part of exhaust gas generated is catalyzed and discharged to the atmosphere, and another part of exhaust gas is supercharged again and enters the engine, and the part of exhaust gas can be combusted again in a cylinder of the engine to reduce nitrogen oxides (NOx) in the exhaust gas so as to reduce emission of pollutants.
An engine assembly 100 having a low pressure EGR system according to an embodiment of the present invention is described below with reference to fig. 1.
The engine 110 with the EGR system according to the present invention includes an engine 110 and a cooler 120, wherein the engine 110 has a throttle valve 111 and an exhaust manifold 112, the cooler 120 has a cooler intake port 122 and a cooler exhaust port 121a, the cooler intake port 122 is connected to the exhaust manifold 112, the cooler exhaust port 121a is connected to the throttle valve 111, and the cooler 120 is adapted to cool at least a portion of exhaust gas discharged from the exhaust manifold 112 to cause the exhaust gas to separate moisture and to introduce the separated moisture into the interior of a cylinder block of the engine 110.
The temperature of the gas discharged from the engine 110 is high, a part of the gas is catalyzed and discharged out of the vehicle, while another portion of the exhaust gas is recirculated through a line through throttle 111 into the cylinder of engine 110, and the part of the exhaust gas is discharged from the exhaust manifold 112 of the engine 110 and enters the cooler 120, the temperature of the exhaust gas is greatly reduced in the cooler 120, thereby fully separating out the water in the water exhaust gas, ensuring that the water can not directly enter the cylinder body of the engine 110, the friction loss between the piston and the cylinder wall can be reduced to a certain extent, which is helpful for prolonging the service life of the engine 110, the precipitated water passes through the throttle valve 111 of the engine 110 after passing through other devices, can enter the cylinder of the large engine 110 in a gaseous state to reduce the temperature in the cylinder, so that the temperature of fuel combustion in the cylinder of the engine 110 is reduced, and the thermal efficiency of the engine 110 is improved. .
According to the engine 110 with the EGR system of the present invention, the cooler 120 is disposed between the exhaust manifold 112 of the engine 110 and the throttle valve 111 of the engine 110, so that the gas in the EGR system that needs to be returned to the engine 110 again can pass through the cooler 120, the exhaust gas is cooled greatly in the cooler 120 to separate out moisture sufficiently, so as to ensure that moisture cannot enter the cylinder of the engine 110, so as to ensure stable operation of the engine 110, avoid increase of friction between the piston and the cylinder wall caused by moisture entering the cylinder in the engine 110, and prolong the service life of the engine 110.
According to an embodiment of the present invention, the engine assembly 100 having the low pressure EGR system further includes a supercharger 130 and a intercooler 140, the supercharger 130 includes a volute, a pressure housing, a driving impeller 153 and a driven impeller 154, the volute defines a first air passage 151 therein, the pressure housing defines a second air passage 152 therein, one end of the first air passage 151 is connected to the exhaust manifold 112 of the engine 110, the other end of the first air passage 151 is connected to the cooler air inlet 122, one end of the second air passage 152 is connected to the cooler air outlet 121a, the other end of the second air passage 152 is connected to the air inlet of the intercooler 140, the air outlet of the intercooler 140 is connected to the throttle valve 111, the driving impeller 153 is disposed in the first air passage 151, and the driven impeller 154 is disposed in the second air passage 152.
The driving impeller 153 and the driven impeller 154 can be linked, the exhaust manifold 112 of the engine 110 discharges exhaust gas and then enters the first air passage 151, the driving impeller 153 in the first air passage 151 is suitable for quickly discharging exhaust gas to the catalyst 155, part of the exhaust gas after passing through the catalyst 155 is discharged to the outside of the vehicle, the other part of the exhaust gas enters the cooler 120, the exhaust gas is sufficiently cooled in the cooler 120 to enable water in the exhaust gas to be analyzed, the exhaust gas after passing through the cooler 120 enters the second air passage 152 through the cooler exhaust port 121a, in the second air passage 152, fresh gas can be mixed with the exhaust gas, the mixed gas is pressurized in the second air passage 152 under the action of the driven impeller 154, the pressurized exhaust gas after passing through the driven impeller 154 enters the intercooler 140 for cooling, so as to reduce the temperature of the pressurized mixed gas and reduce the heat load of the engine 110, the intake air amount of the engine 110 is increased, and the mixture gas passing through the intercooler 140 enters the cylinder of the engine 110 to be mixed with fuel for combustion.
Through the arrangement of the supercharger 130 and the intercooler 140, the engine assembly 100 with the low-pressure EGR system can operate more stably, the stability of the engine 110 is improved, and the power performance of the engine 110 is improved to a certain extent.
According to an embodiment of the present invention, a heating device 160 is disposed between the cooler exhaust port 121a and the one end of the second air duct 152, the heating device 160 is adapted to heat the exhaust gas passing through the cooler 120, and the heating device 160 can provide heat from the coolant passing through the engine 110 to heat the exhaust gas passing through the cooler 120, so as to increase the saturation degree of the exhaust gas, fully dry the exhaust gas, further reduce the moisture entering the cylinder of the engine 110, and improve the stability of the engine 110.
According to an embodiment of the present invention, the heating device 160 includes a heat exchanger 161 and an electric heater 162, the heat exchanger 161 has a first heat exchange path 161a and a second heat exchange path 161b, the first heat exchange path 161a communicates with a coolant path in the engine 110, a coolant can flow through the first heat exchange path 161a, the first heat exchange path 161a can communicate with an outlet of the coolant path of the engine 110, wherein the coolant can be a coolant flowing out from an engine cylinder head, the temperature of the coolant is high, the coolant passes through the engine cylinder head and exchanges heat with the engine, the high temperature coolant exchanges heat with the exhaust gas in the heat exchanger 151, so that the high temperature coolant transfers heat to the exhaust gas with low temperature after passing through the cooler 120; the second heat exchange path 161b is connected to the cooler exhaust port 121a, the exhaust gas having a lower temperature cooled by the cooler 120 enters the heat exchanger 161 through the second heat exchange path 161b, the first heat exchange path 161a and the second heat exchange path 161b may be disposed adjacent to each other, and the exhaust gas in the second heat exchange path 161b may exchange heat with the coolant in the first heat exchange path 161a sufficiently to increase the temperature of the exhaust gas, increase the saturation of the exhaust gas, and dry the exhaust gas sufficiently.
The electric heater 162 is disposed downstream of the heat exchanger 161, the electric heater 162 is adapted to secondarily heat the exhaust gas passing through the heat exchanger 161 so that the exhaust gas may reach a certain temperature standard, and it is ensured that the moisture content in the exhaust gas is extremely low under different environments, the air inlet of the electric heater 162 is communicated with the second heat exchange passage 161b, and the air outlet of the electric heater 162 is connected with one end of the second air duct 152.
According to an embodiment of the present invention, the engine assembly 100 with the low pressure EGR system further includes a water storage tank 170, a water inlet of the water storage tank 170 is connected to the condensed water outlet 123 of the cooler 120, the cooled and separated water of the exhaust gas in the cooler 120 flows out through the condensed water outlet 123 of the cooler 120, and the cooled and separated water can be continuously stored in the water storage tank 170.
According to an embodiment of the present invention, the water outlet of the water storage tank 170 is selectively connected to the throttle valve 111 of the engine 110, and an atomizer 180 is further disposed between the water outlet of the water storage tank 170 and the throttle valve 111 of the engine 110, and the water outlet of the water storage tank 170 is connected to the water inlet of the atomizer 180. Under some working conditions of the engine 110, for example, during rapid acceleration of the vehicle, the power of the engine 110 is close to the power point, in order to suppress exhaust temperature, the water in the water outlet tank is atomized by the atomizer 180, and the atomized water can enter the cylinder of the large engine 110 through the throttle valve 111 of the engine 110 in a gaseous state to reduce the temperature in the cylinder, so that the temperature of fuel combustion in the cylinder of the engine 110 is reduced, and the thermal efficiency of the engine 110 is improved. The water in the exhaust gas is prevented from entering the cylinder body of the engine 110 in a liquid state, the friction force between the piston and the cylinder wall is reduced, and the service life of the engine is prolonged.
According to an embodiment of the present invention, the cooling temperature of the intercooler 140 for the gas is not less than the cooling temperature of the cooler 120 for the exhaust gas, so as to prevent the gas from having water in the intercooler 140 to reduce the loss of the engine 110; alternatively, the intercooler 140 may have a cooling temperature for intake air 5 ℃ higher than the cooling temperature for exhaust gas by the cooler 120.
According to an embodiment of the invention, the engine assembly 100 further comprises: the liquid inlet of the radiator 190 is connected with the liquid outlet of the cooler 120, the liquid outlet of the radiator 190 is connected with the liquid inlet of the cooler 120, an external cooling circulation can be formed between the cooler 120 and the radiator 190, the temperature of the external cooling circulation is low, the radiator 190 can be an electroplating radiator to improve the heat dissipation efficiency of the radiator 190, the cooling liquid exchanges heat with the exhaust gas in the cooler 120 to reduce the temperature of the exhaust gas, so that the exhaust gas fully separates out moisture, and the cooling liquid flows back to the radiator 190 after fully exchanging heat in the cooler 120 and exchanges heat with the air to transfer the heat carried by the exhaust gas to the air. The radiator 190 is also provided with a fan 191 outside, and the radiator 190 and the fan 191 are arranged at the air inlet grille of the whole vehicle, so that the heat dissipation of the radiator 190 can be kept efficient in the running process of the vehicle, and the cooling effect of the cooler 120 on the exhaust gas is improved.
The coolant flowing through the cooler 120 is provided by the coolant of the cooling system of the entire vehicle, and the temperature of the coolant flowing out of the radiator 190 is low, so that moisture can be separated from the exhaust gas in the cooler 120.
As shown in fig. 2 to 4, the cooler 120 according to an embodiment of the present invention may include an outer shell 11 and an inner shell 12.
The inner housing 12 is disposed in the outer housing 11, the inner housing 12 is spaced apart from at least a portion of the outer housing 11 to form a cooling cavity 101, a flowing cooling liquid may be filled in the cooling cavity 101, high-temperature EGR exhaust gas may pass through the inner housing 12, and the cooling liquid in the cooling cavity 101 may exchange heat with the exhaust gas in the inner housing 12 to take a portion of the exhaust gas in the inner housing 12, so as to reduce the temperature of the exhaust gas.
Because the temperature of the waste gas is reduced, the water vapor in the waste gas can be separated out and condensed into condensed water, and the condensed water can be discharged from the inner shell 12, so that the cooler 120 can play a role of drying the waste gas, and the waste gas is prevented from having the condensed water separated out in the intercooler 140.
Specifically, the inner housing 12 is provided with a cooler air inlet 122, a cooler air outlet 121a, and a condensed water outlet 123, the cooler air inlet 122 is connected to the exhaust manifold 112 of the engine 110, the cooler air outlet 121a is connected to the throttle valve 111 of the engine 110, and the condensed water outlet 123 is connected to a condensation pipe penetrating the outer housing 11. Thus, the exhaust gas discharged from the exhaust manifold 112 of the engine 110 can enter the cooling chamber 101 through at least the cooler intake port 122, and after moisture is precipitated in the cooling chamber 101, the exhaust gas can be discharged from the cooler exhaust port 121a and enter the throttle valve 111 of the engine 110, while the precipitated condensed water can be discharged from the cold air water outlet.
The outer shell 11 is further provided with a cooling liquid inlet 105 and a cooling liquid outlet 106 which are communicated with the cooling cavity 101, and cooling liquid can enter the cooling cavity 101 from the cooling liquid inlet 105, then take part of heat of the exhaust gas away, and then be discharged from the cooling liquid outlet 106. It should be noted that the cooling chamber 101 may be connected to an inlet of the heat sink 190 and an outlet of the cooler 120, and specifically, the cooling fluid inlet 105 may be connected to an outlet of the heat sink 190, the cooling fluid outlet 106 may be connected to an inlet of the heat sink 190, and the heat sink 190 may be used to cool the cooling fluid discharged from the cooling chamber 101.
According to the engine 110 of the embodiment of the invention, the cooler 120 can quickly and effectively reduce the temperature of the exhaust gas, so as to separate out the water in the exhaust gas, and prevent the exhaust gas from separating out the water after passing through the intercooler 140, which affects the service life of the intercooler 140.
In some embodiments of the present invention, the flow direction of the exhaust gas between the cooler inlet 122 and the cooler outlet 121a is different from the flow direction of the cooling liquid between the cooling liquid inlet 105 and the cooling liquid outlet 106. Therefore, the exhaust gas can be cooled more uniformly and rapidly, the temperature of the exhaust gas is reduced, and moisture in the exhaust gas is separated out.
Further, the flow direction of the exhaust gas between the cooler inlet port 122 and the cooler outlet port 121a is opposite to the flow direction of the coolant between the coolant inlet 105 and the coolant outlet 106. This further accelerates the cooling rate of the exhaust gas, thereby rapidly analyzing the water in the exhaust gas.
Specifically, the cooler air inlet 122 and the cooling liquid outlet 106 are located at one end of the cooler 120 on the same side, and the cooler air outlet 121a and the cooling liquid inlet 105 are located at the other end of the cooler 120 on the same side.
The structure of the cooler 120 in the embodiment of the present invention is described in detail below.
The shape of the inner housing 12 is similar to the shape of the outer housing 11, the inner housing 12 and the outer housing 11 being spaced apart to form a cooling chamber 101, the inner housing 12 being considered as a reduced version of the outer housing 11. The cooler inlet 122 is located at the right end of the inner housing 12, the cooler outlet 121a is located at the left end of the inner housing 12, while the coolant inlet 105 is located at the left end of the outer housing 11 and the coolant outlet 106 is located at the right end of the outer housing 11. Thereby, it is possible to achieve that the flow direction of the exhaust gas between the cooler intake port 122 and the cooler exhaust port 121a is different from the flow direction of the cooling liquid between the cooling liquid inlet 105 and the cooling liquid outlet 106.
Further, the coolant inlet 105 is located at a lower side of the outer case 11 near the cooler exhaust port 121a, and the coolant outlet 106 is located at an upper side of the outer case 11 near the cooler intake port 122. Thus, interference between the pipe connecting the coolant inlet 105 and the pipe connecting the cooler exhaust port 121a, and interference between the pipe connecting the coolant outlet 106 and the pipe connecting the cooler inlet 122 can be effectively avoided.
According to some embodiments of the present invention, the bottom wall of the inner case 12 is at least partially recessed downward to form a recess 121, and the condensed water outlet 123 may be provided on the recess 121. Therefore, after the moisture in the exhaust gas is condensed into condensed water, the condensed water can be discharged from the condensed water outlet 123 by the gravity of the exhaust gas.
Further, the recess 121 is constructed in an inverted triangular structure, and the condensed water outlet 123 may be disposed at the lowest point of the triangular structure, thereby ensuring that the condensed water can be entirely discharged from the condensed water outlet 123.
In some embodiments of the present invention, the inner housing 12 is plural, and the plural inner housings 12 are arranged side by side in the outer housing 11. Thereby, the cooling efficiency of the cooler 120 is improved, and the temperature of the exhaust gas can be more rapidly lowered. Preferably, the plurality of inner housings 12 are spaced apart from one another, ensuring that the coolant uniformly cools the exhaust gas in the inner housings 12.
The engine assembly 100 having the low-pressure EGR system in the embodiment of the present invention is briefly described below.
The engine assembly 100 according to the embodiment of the present invention includes the engine 110 and the cooler 120 in the above-described embodiment.
The engine 110 has a throttle valve 111 and an exhaust manifold 112, a cooler intake port 122 is connected to the exhaust manifold 112, a cooler exhaust port 121a is connected to the throttle valve 111, and a cooler 120 is adapted to cool at least a portion of the high-temperature exhaust gas discharged from the exhaust manifold 112 to dehydrate the exhaust gas.
The engine assembly 100 according to the embodiment of the present invention further includes a water storage tank 170, and the water inlet 107 of the water storage tank 170 is connected to the condensed water outlet 123. Thus, the condensed water discharged from the cooler 120 may be introduced into the water storage tank 170 to be stored, and may be supplied to the burner of the engine 110 when necessary.
A vehicle according to an embodiment of the invention is briefly described below.
According to the vehicle provided with the engine assembly 100 with the low-pressure EGR system of the embodiment, the vehicle provided with the engine assembly 100 with the low-pressure EGR system has good dynamic performance, the reliability of the engine 110 is high, and the service life is long.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An engine assembly (100) having a low pressure EGR system, comprising:
an engine (110), the engine (110) having a throttle valve (111) and an exhaust manifold (112);
a cooler (120), the cooler (120) having a cooler air inlet (122), a cooler air outlet (121a) and a condensed water outlet (123), the cooler air inlet (122) being connected to an exhaust manifold (112), the cooler air outlet (121a) being connected to the throttle valve (111), the cooler (120) being adapted to cool at least a portion of the exhaust gas discharged from the exhaust manifold (112) to cause the exhaust gas to separate out moisture and to direct the separated moisture into the interior of the cylinder of the engine (110).
2. The engine assembly (100) with the low-pressure EGR system of claim 1 further comprising: a supercharger (130) and a intercooler (140), the supercharger (130) comprising: a volute defining a first air passage (151), and a pressure shell defining a second air passage (152), wherein one end of the first air passage (151) is connected with an exhaust manifold (112) of the engine (110), the other end of the first air passage (151) is connected with the cooler air inlet (122), one end of the second air passage (152) is connected with the cooler air outlet (121a), the other end of the second air passage (152) is connected with an air inlet of the intercooler (140), and an air outlet of the intercooler (140) is connected with the throttle valve (111);
a driving impeller (153) and a driven impeller (154), the driving impeller (153) being disposed in the first air passage (151), the driven impeller (154) being disposed in the second air passage (152).
3. The engine assembly (100) with the low-pressure EGR system of claim 2 wherein a heating device (160) is disposed between the cooler exhaust port (121a) and the one end of the second air passage (152), the heating device (160) being adapted to heat exhaust gas that has just passed through the cooler (120).
4. The engine assembly (100) with the low-pressure EGR system of claim 3, wherein the heating device (160) comprises:
a heat exchanger (161), the heat exchanger (161) having a first heat exchange passage (161a) and a second heat exchange passage (161b), the first heat exchange passage (161a) communicating with a coolant passage in the engine (110), the second heat exchange passage (161b) being connected to the cooler exhaust port (121 a);
an electric heater (162), the electric heater (162) being adapted to secondarily heat the exhaust gas passing through the heat exchanger (161), an air inlet of the electric heater (162) being communicated with the second heat exchanging passage (161b), and an air outlet of the electric heater (162) being connected to the one end of the second air passage (152).
5. The engine assembly (100) with the low pressure EGR system according to any of claims 1-4, further comprising: an atomizer (180), wherein a water inlet of the atomizer (180) is connected with a condensed water outlet (123) of the cooler (120).
6. The engine assembly (100) with the low pressure EGR system of claim 5, characterized in that the water outlet of the atomizer (180) is selectively in communication with a throttle valve (111) of the engine (110).
7. The engine assembly (100) with the low-pressure EGR system of claim 6, further comprising: a water inlet of the water storage tank (170) is connected with a condensed water outlet (123) of the cooler (120), and a water outlet of the water storage tank (170) is connected with a water inlet of the atomizer (180).
8. The engine assembly (100) with the low-pressure EGR system of claim 2 wherein the cooling temperature of the intercooler (140) for gas is not less than the cooling temperature of the cooler (120) for exhaust gas.
9. The engine assembly (100) with the low-pressure EGR system of claim 1 further comprising: a liquid inlet of the radiator (190) is connected with a liquid outlet of the cooler (120), and the liquid outlet of the radiator (190) is connected with a liquid inlet of the cooler (120).
10. A vehicle comprising an engine assembly (100) with a low pressure EGR system according to any of claims 1-9.
Priority Applications (1)
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| CN201811457106.9A CN111255596A (en) | 2018-11-30 | 2018-11-30 | Engine assembly and vehicle with EGR system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811457106.9A CN111255596A (en) | 2018-11-30 | 2018-11-30 | Engine assembly and vehicle with EGR system |
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| CN111255596A true CN111255596A (en) | 2020-06-09 |
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| CN201811457106.9A Pending CN111255596A (en) | 2018-11-30 | 2018-11-30 | Engine assembly and vehicle with EGR system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377339A (en) * | 2020-12-01 | 2021-02-19 | 广西玉柴机器股份有限公司 | Method and system for separating water vapor from EGR waste gas |
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