CN114991931B - Engine cooling system and power device - Google Patents
Engine cooling system and power device Download PDFInfo
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- CN114991931B CN114991931B CN202110226816.6A CN202110226816A CN114991931B CN 114991931 B CN114991931 B CN 114991931B CN 202110226816 A CN202110226816 A CN 202110226816A CN 114991931 B CN114991931 B CN 114991931B
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- engine
- water jacket
- temperature
- thermostat
- passage
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- 238000001816 cooling Methods 0.000 title claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 149
- 239000002826 coolant Substances 0.000 claims abstract description 53
- 239000000110 cooling liquid Substances 0.000 claims abstract description 46
- 239000010705 motor oil Substances 0.000 claims description 13
- 210000000476 body water Anatomy 0.000 claims description 10
- 239000012809 cooling fluid Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 5
- 239000002918 waste heat Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000011981 development test Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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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
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
-
- 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
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The engine cooling system comprises a water pump, an engine water jacket, an EGR cooler and a cooling channel, wherein the EGR cooler is used for cooling exhaust gas recycled by the engine, the heater is used for providing warm air for the engine, the water pump, the engine water jacket, the EGR cooler and the heater are communicated end to end through the cooling channel, and the water pump is used for inputting cooling liquid into the cooling channel so that the cooling liquid sequentially flows through the engine water jacket, the EGR cooler and the heater and returns to the water pump to form circulation. Through setting up EGR cooler and heater to make the coolant liquid flow through engine water jacket, EGR cooler and heater in proper order, usable EGR cooler heats the coolant liquid, thereby can make the temperature of the warm braw of heater rise, can provide the higher warm braw of temperature for the engine, the effectual waste heat that has utilized avoids thermal waste, promotes the efficiency of engine.
Description
Technical Field
The invention relates to the technical field of engine cooling, in particular to an engine cooling system and a power device.
Background
In order to ensure reliability, automobiles are generally equipped with an engine cooling system that can cool the engine well. The existing engine cooling system mainly comprises the steps of conveying cooling water into an engine water jacket through a water pump, discharging water from a water outlet of the engine water jacket, distributing the water into a heater, a radiator, an engine oil cooler and the like, and then returning the water to the water pump to complete circulation.
The existing engine cooling system cannot effectively utilize heat of an EGR cooler, hot air with high temperature cannot be provided for an engine, heat is wasted, and engine efficiency is low.
Disclosure of Invention
The invention aims to provide an engine cooling system and a power device, which can utilize the heat of an EGR cooler to heat a heater, so that the temperature of warm air entering an engine is increased, waste heat is effectively utilized, and the efficiency of the engine is improved.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, the present invention provides an engine cooling system comprising a water pump, an engine water jacket, an EGR cooler for cooling exhaust gas recirculated by an engine, a heater for providing warm air to the engine, and a cooling passage through which the water pump, the engine water jacket, the EGR cooler, and the heater communicate end to end, the water pump being configured to input a coolant to the cooling passage such that the coolant flows through the engine water jacket, the EGR cooler, and the heater in that order, and back to the water pump to form a cycle.
In one embodiment, the engine water jacket comprises a cylinder cover water jacket and a cylinder body water jacket which are communicated, the automobile cooling system further comprises a temperature adjusting component, the cylinder body water jacket is communicated with the temperature adjusting component, the cylinder cover water jacket is communicated with the cooling channel, and the temperature adjusting component is used for controlling whether cooling liquid of the cylinder body water jacket participates in circulation.
In one embodiment, the temperature regulating assembly comprises a first temperature regulator, a second temperature regulator and a bypass pipeline, wherein the bypass pipeline is communicated with the first temperature regulator and the second temperature regulator, the first temperature regulator is communicated with the cylinder water jacket, the second temperature regulator is communicated with the water pump, the engine cooling system further comprises a radiator, the radiator is communicated with the second temperature regulator and the bypass pipeline, and the second temperature regulator is used for controlling whether cooling liquid of the radiator participates in circulation.
In one embodiment, the cooling channel comprises a first channel and a second channel, the first channel is communicated with the water pump and the water inlet of the cylinder cover water jacket, the second channel is communicated with the water inlet of the cylinder cover water jacket and the second temperature regulator, and the EGR cooler and the heater are arranged on the second channel.
In one embodiment, the cooling passage further includes a third passage that communicates the head jacket and the first thermostat.
In one embodiment, the engine cooling system further comprises an engine oil cooler, a fourth passage, and a fifth passage, the fourth passage communicating with the second thermostat and the water pump, the fifth passage communicating with the first passage and the fourth passage, the engine oil cooler being disposed on the fifth passage.
In one embodiment, the first temperature regulator is preset with a first opening temperature, and when the cooling liquid in the cylinder water jacket reaches the first opening temperature, the first temperature regulator is opened so that the cooling liquid in the cylinder water jacket participates in circulation.
In one embodiment, the second thermostat is preset with a second opening temperature, and when the cooling liquid in the cylinder water jacket reaches the second opening temperature, the second thermostat is opened to enable the radiator to participate in circulation, wherein the second opening temperature is higher than the first opening temperature.
In one embodiment, the engine cooling system further comprises a controller and a detector, wherein the controller is electrically connected with the first temperature regulator and/or the second temperature regulator and the detector, the detector is used for detecting the temperature of the cooling liquid of the cylinder water jacket, and the controller is used for controlling the first temperature regulator and/or the second temperature regulator to be started according to the temperature detected by the detector.
In a second aspect, embodiments of the present invention also provide a power plant comprising an engine cooling system according to any of the various embodiments of the first aspect.
Through setting up EGR cooler and heater to make the coolant liquid flow through engine water jacket, EGR cooler and heater in proper order, usable EGR cooler heats the coolant liquid, thereby can make the temperature of the warm braw of heater rise, can provide the higher warm braw of temperature for the engine, the effectual waste heat that has utilized avoids thermal waste, promotes the efficiency of engine.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an engine cooling system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an engine cooling system including a water pump 10, an engine water jacket 20, an EGR cooler 30, a heater 40, and a cooling passage.
The water pump 10 is used for pumping a cooling liquid, and the cooling liquid can be pure water or a solution of 50% of cooling liquid mixed with 50% of glycol in the embodiment of water doped with any one or more of alcohol, glycerol, glycol and the like. The engine water jacket 20 is used to form a passage through which a coolant flows to dissipate heat for the engine. EGR (Exhaust Gas recirculation) coolers are used to cool the Exhaust Gas recirculated by the engine. The heater 40 is used to supply warm air to the engine. The cooling channels are used to provide channels for the flow of cooling fluid to flow in the system.
The water pump 10, the engine water jacket 20, the EGR cooler 30, and the heater 40 are connected end to end through cooling passages. The water pump 10 inputs the coolant to the cooling passage, and the coolant flows through the engine water jacket 20, the EGR cooler 30, and the heater 40 in this order, and returns to the water pump 10 to circulate.
After the cooling liquid flows through the EGR cooler 30, the cooling liquid is heated by the heat provided by the exhaust gas of the EGR cooler 30, so that the temperature of the cooling liquid flowing into the air heater 40 is increased to heat the air heater 40, the temperature of the warm air provided by the air heater 40 to the engine is increased, and the engine has better fuel combustion performance when obtaining the warm air with higher temperature, so that the power performance can be improved. In addition, the EGR cooler 30 and the air heater 40 are connected in series in the loop, so that the water pump 10 can use one output, more flow is not required to be provided, the output work of the water pump 10 can be reduced, and better fuel consumption economy can be obtained.
Therefore, in this embodiment, by arranging the EGR cooler 30 and the air heater 40, and making the cooling liquid flow through the engine water jacket 20, the EGR cooler 30 and the air heater 40 in sequence, the EGR cooler 30 can be used to heat the cooling liquid, so that the temperature of the warm air of the air heater 40 can be raised, the warm air with higher temperature can be provided for the engine, the waste heat is effectively utilized, the waste of the heat is avoided, and the efficiency of the engine is improved.
In one embodiment, referring to FIG. 1, an engine water jacket 20 includes a head water jacket 21 and a block water jacket 22 in communication, the head water jacket 21 being in communication with a cooling gallery. The engine cooling system also includes a attemperation assembly 50, with the block water jacket 22 in communication with the attemperation assembly 50. The thermostat assembly 50 is used to control whether the coolant of the block water jacket 22 is engaged in the cycle. Specifically, the cooling passage includes a first connecting passage 212 and a second connecting passage 223, the first connecting passage 212 communicates with the head water jacket 21 and the block water jacket 22, and the second connecting passage 223 communicates with the block water jacket 22 and the temperature adjusting assembly 50. The cylinder water jacket 22 is sleeved around the cylinder combustion chamber, and the cylinder water jacket 22 is used for passing cooling liquid so as to cool the cylinder. Also, a head jacket 21 is provided around the head combustion chamber, and the head jacket 21 is adapted to be passed by a coolant to cool the head. Wherein the head water jacket 21 may be a first internal passage 211, the cylinder water jacket 22 may be a second internal passage 221 and a third internal passage 222 connected in parallel, one end of the first connecting passage 212 communicates with the first internal passage 211, the other end of the first connecting passage 212 communicates with the second internal passage 221 and the third passage 83, and the second connecting passage 223 communicates with one ends of the second internal passage 221 and the third internal passage 222 remote from the first connecting passage 212.
It will be appreciated that during cold start, the temperature of the cylinder is low, and if the coolant in the cylinder water jacket 22 participates in the circulation, the temperature of the cylinder will be unfavorable to rise, resulting in high fuel consumption, more harmful gas emissions, and adverse conditions in terms of economy and environment. Whether the cooling liquid of the cylinder water jacket 22 participates in circulation or not is controlled by arranging the temperature adjusting assembly 50, so that the cylinder water jacket 22 does not participate in circulation during cold start, the temperature of the cylinder can be quickly increased, the oil consumption and the emission of harmful gas can be reduced, and the method is environment-friendly and beneficial to improving the economy. In addition, when the cold start is completed and the engine temperature rises to a higher temperature, the cooling liquid of the cylinder water jacket 22 can be controlled by the temperature adjusting assembly 50 to participate in circulation in order to ensure reliability.
In one embodiment, referring to FIG. 1, a attemperation assembly 50 includes a first attemperator 51, a bypass line 84, and a second attemperator 52. The bypass line 84 communicates between the first thermostat 51 and the second thermostat 52, and specifically, the bypass line 84 is normally open to the first thermostat 51 and communicates with the second port 521 of the second thermostat 52. The first thermostat 51 is communicated with the cylinder water jacket 22, that is, the first interface 511 of the first thermostat 51 is communicated with the cylinder water jacket 22 through the second connecting passage 223, and the second thermostat 52 is communicated with the water pump 10. The engine cooling system further includes a radiator 60, the radiator 60 being in communication with the second thermostat 52 and the bypass line 84, and in particular a sixth passage 86 communicating the bypass line 84 with a third interface 522 of the second thermostat 52, the radiator 60 being disposed on the sixth passage 86. The second thermostat 52 is used to control whether the coolant of the radiator 60 is involved in the circulation. The first thermostat 51 and/or the second thermostat 52 may be selected from a conventional wax-type thermostat or an electronic thermostat having a larger temperature-adjusting range. Whether the first interface 511, the second interface 521 and the third interface 522 are turned on or not can be controlled, and how to control them will be described in detail later.
The second thermostat 52 may also control whether the bypass line 84 is connected to the second thermostat 52, i.e. whether the second port 521 is opened, and under the control of the second thermostat 52, the coolant entering the bypass line 84 from the first thermostat 51 has the following three conditions:
(1) the radiator 60 does not participate in the circulation at all, and the cooling liquid passing through the first temperature regulator 51 enters the second temperature regulator 52 through the bypass line 84 and flows back into the water pump 10 for the next cycle.
(2) Part of the radiator 60 participates in circulation, and part of the cooling liquid passing through the first temperature regulator 51 enters the second temperature regulator 52 through the bypass pipeline 84 and flows back into the water pump 10, and the other part enters the radiator 60 for cooling and then flows back to the water pump 10 through the second temperature regulator 52.
(3) The radiator 60 is completely circulated, the cooling liquid passing through the first thermostat 51 does not flow to the second thermostat 52 through the bypass line 84, but the cooling liquid is completely cooled by entering the radiator 60 and then flows back to the water pump 10 through the second thermostat 52.
By arranging the second temperature regulator 52, the second temperature regulator 52 can regulate the temperature of the cylinder body and the cylinder cover (mainly the cylinder cover) by controlling the circulation degree of the cylinder body water jacket 22 and the cylinder cover water jacket 21 into the radiator 60, so that the engine has the temperature suitable for the current working condition, and the economy and the environmental protection degree are improved. For example, during small cycles, the second thermostat 52 can control engine coolant not to enter the radiator 60 for circulation to ensure cold start and engine temperature rise to a desired temperature for a period of time after cold start to reduce harmful gas content and fuel consumption. During large cycles, the second thermostat 52 can control the degree to which engine coolant is circulated into the radiator 60 such that the engine temperature is higher during low load conditions, friction losses are reduced to increase efficiency, and the engine temperature is maintained at a safe temperature during high load conditions for higher reliability.
In one embodiment, referring to FIG. 1, the cooling channel includes a first channel 81 and a second channel 82. The first passage 81 communicates with the water pump 10 and the water inlet of the head jacket 21, and the second passage 82 communicates with the water inlet of the head jacket 21 and the second thermostat 52. The EGR cooler 30 and the heater 40 are provided on the second passage 82. Specifically, the EGR cooler 30 is disposed upstream of the heater 40 so that the coolant first absorbs the heat of the exhaust gas to heat the warm air at the time of cold start. The second channel 82 is connected to the water inlet of the cylinder head water jacket 21, so as to ensure independent cooling of the branch of the cylinder head water jacket 21 and the branch of the second channel 82, which is beneficial to improving the cooling effect. The flow rate of the cooling liquid of the branch of the cylinder cover water jacket 21 is not increased, so that the cooling liquid of the cylinder cover water jacket 21 can be quickly heated, and the effect of quick warming up is achieved.
In one embodiment, referring to FIG. 1, the cooling channel further includes a third channel 83. The third passage 83 communicates the head jacket 21 with the first thermostat 51. So that the coolant of the head jacket 21 enters the first thermostat 51 to cool the coolant subsequently to the radiator 60 or to the water pump 10 through the bypass line 84 for the next cycle.
Referring to fig. 1, the engine cooling system further includes an engine oil cooler 70, a fourth passage 85 and a fifth passage 88, the fourth passage 85 communicates with the second thermostat 52 and the water pump 10, the fifth passage 88 communicates with the first passage 81 and the fourth passage 85, and the engine oil cooler 70 is disposed on the fifth passage 88. The oil cooler 70 is provided on an oil circuit, and when the coolant passes through the oil cooler 70, the coolant exchanges heat (absorbs or releases heat) with the oil, so that the oil is cooled or heated. The fourth passage 85 and the fifth passage 88 are normally open, so that the coolant in the fourth passage 85 flows into the oil cooler 70 through the fifth passage 88 and returns to the water pump 10, regardless of whether the second thermostat 52 is opened or not. When cold start, the temperature of engine oil is low, and the temperature of coolant liquid is higher than engine oil, can heat engine oil, can reduce engine friction damage, promotes engine efficiency. When the engine is under the working condition of high load and high rotation speed, the temperature of engine oil is higher than that of cooling liquid, and the cooling liquid can cool the engine oil, so that the reliability of the engine is ensured.
In one embodiment, referring to fig. 1, a first opening temperature is preset for the first temperature regulator 51. When the temperature of the coolant in the third passage 83 reaches the first opening temperature, the first port 511 of the first thermostat 51 is opened to allow the coolant in the block water jacket 22 to participate in circulation. It will be appreciated that when the temperature of the coolant in the third passage 83 is lower than the first opening temperature, the engine temperature is lower and needs to be raised, at which time the first port 511 of the first thermostat 51 is closed so that the coolant in the block water jacket 22 does not flow until the temperature of the coolant in the third passage 83 is raised to the first opening temperature. When the local temperature of the cylinder may be too high or the temperature difference between the cylinder and the cylinder head may be too large, the first interface 511 of the first temperature regulator 51 is opened to protect the cylinder, so that the cooling liquid of the cylinder water jacket 22 starts to circulate, and the temperature rising speed of the cylinder is slowed down.
In one embodiment, referring to fig. 1, the second thermostat 52 is pre-configured with a second opening temperature. When the temperature of the coolant in the bypass line 84 reaches the second open temperature, the third interface 522 of the second thermostat 52 is opened to allow the radiator 60 to participate in the cycle. Wherein the second opening temperature is greater than the first opening temperature. It will be appreciated that when the temperature of the coolant in the bypass line 84, i.e., the coolant in the block water jacket 22 and the head water jacket 21, merges, the engine temperature is still lower and has a certain difference from the ideal temperature when the temperature of the coolant in the bypass line 84 is lower than the second opening temperature, so that the third port 522 of the second thermostat 52 is closed, the radiator 60 does not participate in the cycle, and the engine temperature continues to rise rapidly. When the cooling liquid in the bypass line 84 reaches the second opening temperature, the engine temperature is close to the ideal temperature, and the third interface 522 of the second temperature regulator 52 is gradually opened, so that part of the cooling liquid in the bypass line 84 also enters the radiator 60 to dissipate heat and then enters the second temperature regulator 52, and the other part of the cooling liquid directly enters the second temperature regulator 52 without dissipating heat through the radiator 60, so that the engine temperature rising speed is reduced, and the engine is well protected. As the engine temperature continues to rise until the second thermostat 52 is fully opened, the engine temperature is maintained at a higher level, thereby reducing engine friction and achieving a fuel saving effect.
In one embodiment, referring to FIG. 1, the engine cooling system further includes a controller (not shown) and a detector (not shown). The controller is electrically connected to the first thermostat 51 and/or the second thermostat 52 and the detector. The detector is used for detecting the temperature of the cooling liquid of the cylinder cover water jacket 21, and the controller is used for controlling the first temperature regulator 51 and/or the second temperature regulator 52 to be opened according to the temperature detected by the detector.
In this embodiment, the detector is disposed on the cylinder cover, and the detector can obtain the temperature of the coolant at the water outlet of the cylinder head water jacket 21. The first thermostat 51 is a conventional wax thermostat, the first opening temperature of which is determined by the properties of the wax pack, and the temperature is generally high. The second thermostat 52 is an electronic thermostat whose second on-temperature is also determined by the properties of the wax pack when not energized, and is typically high. The second on temperature may be effectively reduced (still higher than the first on temperature) upon energization to advance the radiator 70 into circulation. The controller writes in mechanical development test data and an ECU program, and the controller controls the second thermostat 52 to be energized by a specific condition (high load high rotation speed condition) to reduce the second opening temperature of the second thermostat 52, thereby opening the second thermostat 52 in advance to bring the radiator 60 into circulation in advance, thereby precisely controlling the temperature of the engine under a large cycle.
In other embodiments, the first thermostat 51 may also be an electronic thermostat, and the controller controls the first thermostat 51 to be energized so that the first thermostat 51 is opened below the first opening temperature to allow the coolant of the cylinder water jacket 22 to enter into circulation in advance, thereby precisely controlling the temperature of the engine in a small cycle.
Through setting up controller and detector, be favorable to controlling the temperature of engine working process better, guarantee the security of engine and the efficiency of engine.
In one embodiment, the cooling passage further includes a seventh passage 89, one end of the seventh passage 89 is connected at a position upstream of the second passage 82, and the other end communicates with the fifth passage 88. The engine cooling system further includes an expansion pot 90, the expansion pot 90 being disposed on the seventh passage 89, the expansion pot 90 being configured to collect air bubbles in the cooling passage and to supplement the cooling passage with cooling liquid when the cooling liquid in the cooling passage is insufficient. By providing the expansion tank 90, the normal operation of the engine cooling system is facilitated.
The specific operating conditions of the engine are described below:
small cycle regime a (cold start): the temperature of the coolant in the third passage 83 is lower than the first opening temperature of the first thermostat 51, and the water pump 10 pumps the coolant into the head water jacket 21 through the first passage 81. At this time, the first port 511 of the first thermostat 51 is not opened, and the coolant in the cylinder water jacket 22 does not enter the circulation. The cooling fluid flows from the first passage 81 to the second passage 82 upstream of the head jacket 21, and branches off to flow through the EGR cooler 30 and the heater 40, and the remaining portion flows through the head jacket 21 to cool the head. The coolant near the outlet downstream of the head jacket 21 flows into the first thermostat 51 through the third passage 83. Because the third port 522 of the second thermostat 52 is not opened, the coolant in the radiator 60 does not enter the circulation, flows into the second thermostat 52 through the bypass line 84, and flows into the water pump 10 to complete the circulation at the junction of the second thermostat 52 and the coolant in the second passage 82.
Small cycle condition b (after cold start): the temperature of the cooling liquid in the third channel 83 is higher than the first opening temperature of the first temperature regulator 51 and lower than the second opening temperature of the second temperature regulator 52, so that the first interface 511 of the first temperature regulator 51 is opened to protect the safety of the cylinder, but the optimal working temperature of the engine is not reached at this time, the third interface 522 of the second temperature regulator 52 is not opened, the radiator 60 cannot participate in circulation, and the engine temperature still needs to be quickly raised to enable the engine to reach the optimal working temperature to achieve the effects of reducing fuel consumption and harmful gas emission. The water pump 10 pumps cooling water into the cylinder head water jacket 21 through the first channel 81, cooling liquid in the cylinder head water jacket 21 is divided into three paths at the upstream (water inlet), one path enters the second channel 82 with the EGR cooler 30 and the air heater 40, the other path enters the cylinder body water jacket 22 through a cylinder head gasket hole (first connecting channel 212) for circulation, and the other path continues to pass through the cylinder head water jacket 21. The coolant flow in the head water jacket 21 flows downstream into the first thermostat 51, and merges with the coolant of the block water jacket 22 in the first thermostat 51. The joined coolant passes through the bypass line 84 and joins the coolant in the second thermostat 52 and the second passage 82 to the water pump 10 to complete the circulation.
Large cycle condition a: when the engine is operating at a light load, the water temperature reaches the second open temperature of the second thermostat 52, at which point the second thermostat 52 is in a de-energized state and begins to open, with both the second port 521 and the third port 522 of the second thermostat 52 being partially open. The water pump 10 pumps cooling water into the cylinder head water jacket 21 through the first channel 81, cooling liquid in the cylinder head water jacket 21 is divided into three paths at the upstream (water inlet), one path enters the second channel 82 with the EGR cooler 30 and the air heater 40, the other path enters the cylinder body water jacket 22 through a cylinder head gasket hole (first connecting channel 212) for circulation, and the other path continues to pass through the cylinder head water jacket 21. The coolant flow in the head water jacket 21 flows downstream into the first thermostat 51, and merges with the coolant of the block water jacket 22 in the first thermostat 51. The merged cooling liquid is divided into two paths, one path enters the second temperature regulator 52 through a bypass pipeline, the other path enters the second temperature regulator 52 after being cooled through the radiator 60, and then the two paths of cooling liquid are merged in the second temperature regulator 52 and enter the water pump 10 to complete circulation. It will be appreciated that the coolant temperature continues to rise to a higher temperature due to the relatively large volume of bypass line 84 initially, the radiator 60 valve is fully open, the bypass is fully closed, and the engine water temperature rises to the desired temperature, thereby reducing engine friction for better economy.
Large cycle condition b: when the engine is operated at a high load, the reliability of the engine is mainly considered, the temperature of the engine is not too high, at this time, the third interface 522 of the second thermostat 52 is started to be electrified and opened, and the second interface 521 and the third interface 522 are both partially opened until the second interface 521 is closed, so that the cooling liquid is circulated to attack the radiator 60, and the temperature of the engine is not too high. The water pump 10 pumps cooling water into the cylinder head water jacket 21 through the first passage 81, cooling liquid in the cylinder head water jacket 21 is divided into three paths at the upstream, one path enters the second passage 82 with the EGR cooler 30 and the engine oil cooler 70, the other path enters the cylinder body water jacket 22 through the cylinder head gasket hole (the first connecting passage 212) for circulation, and the other path continues to pass through the cylinder head water jacket 21. The coolant flow in the head water jacket 21 flows into the first thermostat 51, and merges with the coolant of the block water jacket 22 in the first thermostat 51. The joined cooling liquid is cooled by the radiator 60 and then enters the water pump 10 through the second temperature regulator 52 to complete circulation.
In the above four working conditions, the cooling liquid in the seventh channel 89 with the expansion pot 90 always participates in circulation, so that the description is omitted.
The embodiment of the invention also provides a power device which can be applied to vehicles of public buses, cars, off-road vehicles and the like. The power plant comprises the engine cooling system provided by the invention. By adding the engine cooling system provided by the invention into the power device, the power device can better control the temperature of the engine in the power device, and can provide warm air with higher temperature for the engine, so that the waste heat is effectively utilized, the waste of heat is avoided, and the efficiency of the engine is improved.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will understand that all or part of the above-described embodiments may be implemented and equivalents thereof may be modified according to the scope of the appended claims.
Claims (9)
1. An engine cooling system, characterized in that the engine cooling system comprises a water pump, an engine water jacket, an EGR cooler, a heater and a cooling channel, wherein the EGR cooler is used for cooling exhaust gas recycled by an engine, the water pump, the engine water jacket, the EGR cooler and the heater are communicated through the cooling channel, and the water pump is used for inputting cooling liquid into the cooling channel so that the cooling liquid sequentially flows through the engine water jacket, the EGR cooler and the heater and returns to the water pump to form circulation;
the engine water jacket comprises a cylinder cover water jacket and a cylinder body water jacket which are communicated, the engine cooling system further comprises a temperature adjusting assembly, the cylinder body water jacket is communicated with the temperature adjusting assembly, the cylinder cover water jacket is communicated with the cooling channel, and the temperature adjusting assembly is used for controlling whether cooling liquid of the cylinder body water jacket participates in circulation;
the cooling channel comprises a second channel, the second channel is communicated with the water inlet of the cylinder cover water jacket and the temperature adjusting component, the branch of the cylinder cover water jacket and the branch of the second channel are independently cooled, and the EGR cooler and the heater are arranged on the second channel.
2. The engine cooling system of claim 1, wherein the attemperation assembly includes a first attemperator, a second attemperator, and a bypass line, the bypass line communicating the first attemperator and the second attemperator, the first attemperator communicating with the cylinder water jacket, the second attemperator communicating with the water pump, the engine cooling system further including a radiator, the radiator communicating with the second attemperator and the bypass line, the second attemperator for controlling whether cooling fluid of the radiator is engaged in circulation.
3. The engine cooling system of claim 2, wherein the cooling passage includes a first passage that communicates with the water pump and the water inlet of the head jacket, and a second passage that communicates with the water inlet of the head jacket and the second thermostat.
4. The engine cooling system of claim 3, wherein the cooling passage further comprises a third passage that communicates the head jacket and the first thermostat.
5. The engine cooling system of claim 4, further comprising an engine oil cooler, a fourth passage communicating with the second thermostat and the water pump, and a fifth passage communicating with the first passage and the fourth passage, the engine oil cooler being disposed on the fifth passage.
6. The engine cooling system of claim 5, wherein the first thermostat is preset with a first opening temperature, and the first thermostat opens to allow coolant in the block water jacket to participate in circulation when the coolant in the block water jacket reaches the first opening temperature.
7. The engine cooling system of claim 6, wherein the second thermostat is pre-set with a second opening temperature, the second thermostat opening to engage the radiator in a cycle when the coolant in the block water jacket reaches the second opening temperature, wherein the second opening temperature is greater than the first opening temperature.
8. The engine cooling system of claim 7, further comprising a controller electrically connected to the first thermostat and/or the second thermostat and the detector, the detector for detecting a temperature of coolant of the cylinder jacket, the controller for controlling the first thermostat and/or the second thermostat to open based on the temperature detected by the detector.
9. A power plant comprising an engine cooling system as claimed in any one of claims 1 to 8.
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|---|---|---|---|
| CN202110226816.6A CN114991931B (en) | 2021-03-01 | 2021-03-01 | Engine cooling system and power device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110226816.6A CN114991931B (en) | 2021-03-01 | 2021-03-01 | Engine cooling system and power device |
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| JP2007263034A (en) * | 2006-03-29 | 2007-10-11 | Isuzu Motors Ltd | Engine cooling water circuit |
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| JP2018119423A (en) * | 2017-01-23 | 2018-08-02 | いすゞ自動車株式会社 | Engine cooling system |
| CN208364235U (en) * | 2018-05-11 | 2019-01-11 | 浙江吉利控股集团有限公司 | A kind of engine-cooling system and automobile |
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2021
- 2021-03-01 CN CN202110226816.6A patent/CN114991931B/en active Active
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| JP2007263034A (en) * | 2006-03-29 | 2007-10-11 | Isuzu Motors Ltd | Engine cooling water circuit |
| JP2012167613A (en) * | 2011-02-15 | 2012-09-06 | Toyota Motor Corp | Engine |
| JP2012225216A (en) * | 2011-04-18 | 2012-11-15 | Toyota Motor Corp | Cooling system of internal combustion engine, and internal combustion engine including the same |
| CN106640318A (en) * | 2015-10-29 | 2017-05-10 | 北汽福田汽车股份有限公司 | Engine cooling system and vehicle with same |
| JP2018119423A (en) * | 2017-01-23 | 2018-08-02 | いすゞ自動車株式会社 | Engine cooling system |
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