CN103987935A - Engine cooling apparatus and engine cooling method - Google Patents
Engine cooling apparatus and engine cooling method Download PDFInfo
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- CN103987935A CN103987935A CN201280058311.2A CN201280058311A CN103987935A CN 103987935 A CN103987935 A CN 103987935A CN 201280058311 A CN201280058311 A CN 201280058311A CN 103987935 A CN103987935 A CN 103987935A
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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
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
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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
- F01P3/12—Arrangements for cooling other engine or machine parts
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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
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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
- 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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P2005/105—Using two or more pumps
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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
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
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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
- F01P2037/00—Controlling
- F01P2037/02—Controlling starting
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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
- F01P2060/00—Cooling circuits using auxiliaries
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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
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/02—Intercooler
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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
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/16—Outlet manifold
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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
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/18—Heater
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The present invention relates to an engine cooling apparatus which comprises an EGR system or the like, and an engine cooling method. Provided are the engine cooling apparatus and the engine cooling method which are capable of reducing the capacity of a main radiator, saving costs, and effectively using a mounting space by providing a sub-radiator having an auxiliary function for the main radiator. A sub-control valve (22) is disposed to split and send a portion of a coolant sent to a main radiator (16) to a sub-circuit when a temperature of the coolant is higher than an upper limit of the temperature of the coolant in a normal engine state, as the result of detecting the temperature of the coolant in a main circuit. The coolant sent by the sub-control valve (22) to the sub-circuit (12) is cooled by a sub-radiator (28) and introduced into a cooler device, and the coolant at the sub-circuit (12) is split to be returned to an upper stream portion of a first pump (18) of the main circuit (8).
Description
Technical field
The cooling unit that the present invention relates to a kind of motor with egr system etc. with and cooling means.
Background technique
So far, as the countermeasure of the caused pollution of atmosphere of automobile exhaust, carrying in the vehicle of diesel engine, extensively adopt and make automobile exhaust be back to the egr system (automobile exhaust recirculating system) of motor.
In above-mentioned diesel engine, if make the automobile exhaust former state of high temperature be back to the air inlet of motor, can produce carbon black (SOOT), and fuel consumption can increase.As the means that address these problems, cooler for recycled exhaust gas (heat exchanger) generally can be set, send automobile exhaust back to motor afterwards by water quench.The cooling water that above-mentioned cooler for recycled exhaust gas uses doubles as the cooling water of cooled engine mostly.
In the main cooling water loop of carrying out engine cooling, postbacked motivation by the cooling water of the wind heat radiation of travelling by foldback through radiator, make it flow into cooler for recycled exhaust gas but can derive a part before cooled engine.This cooling water forms following flow path: at above-mentioned cooler for recycled exhaust gas by after cooling EGR gas (automobile exhaust), with the cooling water interflow from radiator inflow engine, then, the cooling water of a part flows to cooler for recycled exhaust gas again, the backward radiator circulation of remaining water quench motor.
Although depend on the operating condition of vehicle, conventionally in engine operation, the temperature of the cooling water after radiator heat-dissipation roughly exceedes 80 DEG C.Therefore, at cooler for recycled exhaust gas by the cooling automobile exhaust of above-mentioned cooling water, can be lower than the water temperature of this cooling water.
Due to the restriction of having strengthened in the last few years automobile exhaust, therefore demand is by degradation countermeasure under the combustion temperature of cooler for recycled exhaust gas high capacity and motor.Wherein, for cooler for recycled exhaust gas high capacity, by making cooler for recycled exhaust gas maximize or the use number of cooler for recycled exhaust gas is increased to multiple correspondences of having carried out.In addition, for the combustion temperature that makes motor declines, need to reduce the temperature of the automobile exhaust (EGR gas) that is back to motor.
As prior art, for example, in patent documentation 1, record EGR gas quench system as shown in Figure 6.This device has: be disposed in the cooling water path 52 of motor 51 water pump 53, be disposed in from the cooler for recycled exhaust gas 57 of the fork peripheral passage 56 of this cooling water water route, downstream side fork and be disposed in the EGR radiator 59 etc. in this downstream side, and reduced EGR gas temperature to engine cooling water temperature interdependency.
In patent documentation 2, record and be provided with the EGR radiator that is independent of engine-cooling system, by itself and cooler for recycled exhaust gas thermal coupling, improved the EGR device of the cooling capacity of cooler for recycled exhaust gas.
In addition, in patent documentation 3, disclose, taking preheat time of internal-combustion engine of shortening the automobiles such as truck as object, had: the first cooling loop that the high temperature of internal-combustion engine and heat exchanger etc. is housed; The type of cooling of the boosting internal combustion engine of the second cooling loop of the low temperature of cooling unit (interstage cooler) and cryogenic heat exchanger etc. is housed.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2006-132469 communique
Patent documentation 2: TOHKEMY 2003-278608 communique
Patent documentation 3: No. 2008/0066697th, U.S. Patent Application Publication
Summary of the invention
The problem to be solved in the present invention
Travel etc. under the low high loaded process of the speed of a motor vehicle in climbing, engine cooling water becomes high temperature.This be because, after the speed of a motor vehicle is slack-off, the wind speed that blows to radiator can decline, cooling effectiveness can decline.In addition due to climbing travel make motor load raise, motor produce heat become many.
Therefore, imagine up to now above-mentioned maximum load and set the heat dispersion of radiator.But, in most low, the middle load running that occupies the vehicle operation time, a part for the actual ability that can only use above-mentioned radiator.
Design for the high loaded process of above-mentioned motor in the situation of radiator, have the problem of having to make large-sized radiator.In above-mentioned patent documentation 1～3, related prior art too.In addition,, if only consider low, middle load running, can dwindle radiator.
The present invention is for having addressed the above problem, its object is to provide a kind of cooling unit and cooling means thereof of motor, by making sub-radiator there is the function of assisting main radiator, alleviate the capacity of main radiator, realize effectively applying flexibly of cost cutting, mounting space.
For the scheme of dealing with problems
For solving above technical problem, the structure of the cooling unit of motor involved in the present invention is, has: main radiator, and this main radiator carries out cooling to the cooling water circulating in motor; Major loop, this major loop is the loop of the cooling water that circulates between above-mentioned motor and above-mentioned main radiator; The first pump, this first pump is arranged on the upstream side of the above-mentioned motor of above-mentioned major loop, circulates and drives above-mentioned cooling water; Sub-radiator, this sub-radiator and above-mentioned major loop are independent, and the cooling water of the cooler arrangement to cooling vehicle-mounted heater carries out cooling; Sub-loop, this sub-loop is the loop of carrying out recirculated cooling water between above-mentioned cooler arrangement and above-mentioned sub-radiator; The second pump, this second pump is arranged on above-mentioned sub-loop midway, circulates and drives the cooling water of this sub-loop; And sub-control valve, this sub-control valve detects the temperature of the cooling water of above-mentioned major loop, and the temperature upper limit of cooling water while exceeding above-mentioned engine steady state in this temperature, by the part shunting of the cooling water of carrying to above-mentioned main radiator, carry to above-mentioned sub-loop, carry out cooling to the cooling water that is transported to above-mentioned sub-loop by above-mentioned sub-control valve with above-mentioned sub-radiator, and make it flow into above-mentioned cooler arrangement, and by the cooling water shunting of above-mentioned sub-loop, and foldback returns the upstream side of above-mentioned first pump of above-mentioned major loop.
The structure of the cooling unit of motor involved in the present invention is: be provided with main control valve, above-mentioned main control valve detects the temperature of the cooling water of above-mentioned major loop, and the lower limit of the temperature of cooling water while not reaching above-mentioned engine steady state in this temperature, the cooling water foldback that flows through above-mentioned motor is postbacked to motivation, carry out the preheating of motor; When said temperature is above-mentioned lower limit when above, by flowing through part or all of cooling water of above-mentioned motor, carry to the above-mentioned main radiator of major loop.
The structure of the cooling unit of motor involved in the present invention is: the lowest temperature value of cooling water when above-mentioned engine steady state is that 80 DEG C, CLV ceiling limit value are 100 DEG C.
The structure of the cooling unit of motor involved in the present invention is: the lowest temperature value of cooling water when above-mentioned engine steady state is that arbitrary value, the CLV ceiling limit value within the scope of 70 DEG C～90 DEG C is the arbitrary value within the scope of 90 DEG C～120 DEG C.
In this case, in above-mentioned scope, for example, lower limit can be set as to 70 DEG C or 85 DEG C etc., for CLV ceiling limit value, for example, can be set as 95 DEG C or 120 DEG C etc.
In addition, the structure of the cooling unit of motor involved in the present invention is: be provided with bypass loop, above-mentioned bypass loop will be carried to the upstream side of above-mentioned the second pump or the sub-loop in downstream side by the cooling water of above-mentioned sub-control valve shunting.
The structure of the cooling unit of motor involved in the present invention is: at the derivation circulation loop of cooling water being shunted from above-mentioned major loop, be provided with cooler for recycled exhaust gas.
In addition, the structure of the cooling unit of motor involved in the present invention is: be provided with cooler for recycled exhaust gas midway in above-mentioned sub-loop.
The cooling means of motor involved in the present invention is, use the cooling unit of the motor that above-mentioned any one records, a part for the cooling water of above-mentioned major loop is transported to above-mentioned sub-loop, with above-mentioned sub-radiator, this cooling water is carried out coolingly, and foldback returns the upstream side of the motor of above-mentioned major loop again.
The effect of invention
According to the cooling unit of motor involved in the present invention, owing to adopting following structure: will be transported to the water quench of sub-loop by sub-control valve with sub-radiator, and make it flow into cooler arrangement, and the cooling water shunting of sub-loop foldback are returned to the upstream side of the first pump of major loop, therefore, main radiator can be set as with low, big or small accordingly when middle load running, obtain and can form compared with existing more main radiator of miniaturization, avoid the maximization of main radiator, in addition, contribute to the effect of effective utilization of the reduction of cost and the mounting space of radiator.
According to the cooling means of motor involved in the present invention, because a part for the cooling water of major loop is transported to sub-loop by the cooling unit that uses motor, with cooling this cooling water of sub-radiator, and foldback returns the upstream side of the motor of major loop again, therefore, size accordingly main radiator can be set as with low, middle load running time, obtains the maximization of avoiding main radiator, also contributes in addition the effect of effective utilization of the reduction of cost and the mounting space of radiator.
Brief description of the drawings
Fig. 1 illustrates what the first mode of execution related to, the block diagram of the formation of the cooling unit of motor.
Fig. 2 illustrates what mode of execution related to, the block diagram of the circulation form of the cooling water in sub-loop (with a part for major loop).
Fig. 3 is the block diagram that the formation of the cooling unit of the related motor of other mode of executions is shown.
Fig. 4 is the block diagram that the formation of the second mode of execution cooling unit that relate to, motor is shown.
Fig. 5 is the block diagram that the formation of the 3rd mode of execution cooling unit that relate to, motor is shown.
Fig. 6 is the figure that the cooling unit of the related EGR gas of existing example is shown.
Description of symbols
4: motor, 6:EGR cooler/(the first cooler for recycled exhaust gas), 8: major loop, 9: derive circulation loop, 10: cooler arrangement (the second cooler for recycled exhaust gas), 12: sub-loop, 14: branched portion, 16: main radiator, 18: the first pumps, 20: main control valve, 22: sub-control valve, 28: sub-radiator, 30: the second pumps, 31: bypass loop (the second bypass loop), 32: bypass loop (the 3rd bypass loop), 38: cooler arrangement (interstage cooler)
Embodiment
Below based on brief description of the drawings embodiments of the present invention.
In the present embodiment, the cooling unit 2 of motor and the method for cooled engine are applicable to, and have carried the vehicle that taking jumbo egr system etc., truck etc., automobile exhaust restriction is carried out corresponding motor 4 (herein as diesel engine).
Fig. 1 is the block diagram that the formation of the cooling unit 2 of the related motor of the first mode of execution is shown.
The cooling unit 2 of this motor has following two loops: the major loop 8 of cooling water, and it uses main radiator 16 to carry out cooling to motor 4 and the first cooler for recycled exhaust gas 6; Sub-loop 12, it uses sub-radiator 28, carries out cooling by the cooling water of low water temperature to the second cooler for recycled exhaust gas 10.
In addition, in above-mentioned sub-loop 12, be provided with branched portion 14, according to predetermined condition, make to flow into major loop 8 at the cooling water of sub-loop 12 interior circulations from this branched portion 14, in the interior circulation of motor 4, and again return sub-loop 12 from major loop 8 foldbacks.
On above-mentioned major loop 8, be provided with: motor 4, main radiator 16, the first pump 18, main control valve 20, sub-control valve 22 and the first cooler for recycled exhaust gas 6.In addition, in above-mentioned sub-loop 12, be provided with: sub-radiator 28, the second cooler for recycled exhaust gas 10 and the second pump 30.In addition, in cooling unit 2, be provided with interstage cooler 38.
Above-mentioned major loop 8 is, makes the cooling water of autonomous radiator 16 through the first pump 18 inflow engines 4, and foldback returns the circulation loop of main radiator 16 again; And be formed with: from a part for the interior derivation cooling water of motor 4, make this part flow into the first cooler for recycled exhaust gas 6, and foldback postbacks the derivation circulation loop 9 in motivation 4 again.In addition, as this derivation circulation loop 9, can be also to derive cooling water from motor 4 major loop 8 in addition, make it flow into the first cooler for recycled exhaust gas 6, foldback goes back to the loop of major loop 8 again.
In addition, on major loop 8, be provided with the first bypass loop 27 that makes cooling water be passed to the first pump 18 from main control valve 20.And on major loop 8, be provided with the second bypass loop 31 that makes cooling water be passed to the second pump 30 from sub-control valve 22.
In above-mentioned sub-loop 12, be formed with and make to flow into the second cooler for recycled exhaust gas 10 from the cooling water of sub-radiator 28, via the second pump 30 again foldback return the circulation loop of sub-radiator 28.
In above-mentioned the second cooler for recycled exhaust gas 10, for by with the further cooling low temperature that becomes of the cooling automobile exhaust (EGR gas) of above-mentioned the first cooler for recycled exhaust gas 6, therefore need than with the cooling lower cooling water of cooling water temperature of main radiator 16.
Above-mentioned main radiator 16 is mainly used in the cooling water of cooled engine 4 use, and in addition, sub-radiator 28 is mainly used in the cooling water that the cooler arrangement such as cooling the second cooler for recycled exhaust gas 10, interstage cooler 38 are used.
In addition, above-mentioned the first cooler for recycled exhaust gas 6, the second cooler for recycled exhaust gas 10 are all for cooling automobile exhaust (EGR gas).Above-mentioned interstage cooler 38 is for cooling of charge gas.
The first pump 18 and the second pump 30 that are arranged on above-mentioned each loop are water pump, drive cooling water to circulate in loop.As above-mentioned the first pump 18 and the second pump 30, the mechanical pump or the electrodynamic type pump that use the driving force of motor 4 are adopted.In this case, can use mechanical pump as the first pump 18, use the mechanical pump identical with the first pump 18 as the second pump 30; Or also only the second pump 30 uses electrodynamic type pump.Electrodynamic type pump is electrical control, can easily control by ECU etc.
Above-mentioned the first pump 18 and the second pump 30 are provided with the entrance (but the first pump 18 has the cooling water interflow from two loops at entrance) of a cooling water, an outlet.
Above-mentioned the first pump 18 is arranged at the major loop 8 (upstream side of motor 4) between main radiator 16 and motor 4, and the cooling water that main radiator 16 is exported drives to motor 4, makes the cooling water circulation in major loop 8.In addition, the second pump 30 is arranged at the sub-loop 12 (downstream side of the second cooler for recycled exhaust gas 10) between the second cooler for recycled exhaust gas 10 and sub-radiator 28, cooling water in sub-loop 12 is driven to the input side of sub-radiator 28, make the cooling water circulation in sub-loop 12.
Above-mentioned main control valve 20 and sub-control valve 22 are all three-way valve (two outlets of an entrance), and the temperature that is detection cooling water is carried out the said thermostat in the water route of switch (shunting) cooling water.
This main control valve 20 is with the temperature of cooling water, and for example 85 DEG C (lower limits of the temperature of cooling water when engine steady state) are benchmark, carry out the switch motion of valve.In addition, sub-control valve 22 is with the temperature higher than main control valve 20, and for example 95 DEG C (CLV ceiling limit value of the temperature of cooling water when engine steady state) are benchmark, carry out the switch motion of valve.In addition, main control valve 20 can carry out the action (and open centre) of standard-sized sheet and complete shut-down, and sub-control valve 22 exists the not situation (guaranteeing to the circulation of major loop 8) for complete shut-down.
Above-mentioned main control valve 20 is arranged at the cooling water of major loop 8 by the position (downstream side of motor 4) after motor 4.This main control valve 20 detects near the temperature of cooling water major loop 8 and carries out the switch of valve, is to flow to main radiator 16 to the cooling water flowing through in motor 4, still flows to the first bypass loop 27 (again in the interior circulation of motor 4) and controls.
In addition, above-mentioned sub-control valve 22 is arranged at the major loop 8 between main control valve 20 and main radiator 16, detects near the temperature of cooling water major loop 8 and carries out the switch of valve.This sub-control valve 22 is to flow to main radiator 16 to flowing through the cooling water of main control valve 20, still flows to the second bypass loop 31 (flowing into sub-loop 12) and controls.
And in above-mentioned major loop 8, near the entrance (upstream side) of the first pump 18, be provided with interflow portion 34.Collaborate in this interflow portion 34 in the loop of the cooling water flowing out from the first cooler for recycled exhaust gas 6.
In addition, in above-mentioned sub-loop 12, on the loop between the second cooler for recycled exhaust gas 10 and the second pump 30, be provided with branched portion 14, the sub-bypass loop 36 diverging from this branched portion 14 is collaborated in above-mentioned interflow portion 34.This sub-bypass loop 36 makes sub-loop 12 be communicated with major loop 8, and the cooling water foldback of sub-loop 12 is returned to major loop 8.
Therefore in above-mentioned interflow portion 34, there is the loop of autonomous radiator 16, from the loop of the first cooler for recycled exhaust gas 6 and from the cooling water interflow in sub-bypass loop 36 these 3 loops, the cooling water flow behind this interflow is to the first pump 18.
In addition, the branched portion 14 of sub-loop 12 with, the second bypass loop 31 is collaborated between the position of sub-loop 12, is provided with one-way valve 37 (only to a direction circulation).This is the refluence of the caused sub-loop 12 of competition in order to prevent the second pump 30 and the first pump 18.
According to the temperature of the cooling water in major loop 8 interior circulations of the operational situation based on motor 4, the circulation form of the cooling water of circulation in major loop 8 and sub-loop 12 is described herein.
This motor 4 is that relate to, near the cooling water temperature of the major loop (main control valve 20, sub-control valve 22) of (while conventionally operation) is made as 85 DEG C of (lower limit)～95 DEG C (CLV ceiling limit value) at this when stable state.
In addition, the cooling water temperature during as above-mentioned engine steady state, can make lower limit is that 80 DEG C, CLV ceiling limit value are 100 DEG C.In addition, the lower limit of the temperature of the cooling water can make above-mentioned engine steady state time is the arbitrary value of the scope of 70 DEG C～90 DEG C, and CLV ceiling limit value is the arbitrary value of the scope of 90 DEG C～120 DEG C.
The lower limit of cooling water temperature when above-mentioned engine steady state, changes according to the friction of the motor of the characteristic based on engine oil and temperature.If engine oil does not warm, viscosity is higher, produces the caused loss of friction, and fuel consumption worsens.In addition, above-mentioned CLV ceiling limit value changes according to the durability of the boiling of water and motor device etc.For example, on plateau, even also can seethe with excitement less than 90 DEG C.Cooling water uprises by pressurization boiling point, but the heat resistance of the device that the launched machine part of above-mentioned CLV ceiling limit value uses, the durability of heat load is limited.In view of such circumstances, make above-mentioned lower limit and CLV ceiling limit value there is amplitude of other scopes or value etc.
First, the situation that motor 4 is hankered is in advance described.
In this case, in the scope of the lower limit of the temperature of the water temperature of the cooling water of major loop 8 in the time not reaching above-mentioned stable state (85 DEG C).
Now, main control valve 20 detects the water temperature of cooling water and becomes the state of closing, and the first bypass loop 27 is shunted and flowed to all cooling waters by main control valve 20, and through the first pump 18, cooling water is again in the interior circulation of motor 4.
That is, the cooling water of major loop 8 becomes: driven by the first pump 18, circulate, and again returned the first pump 18 by foldback from motor 4 inside the first bypass loop 27, be transported to the current of motor 4, thereby become the preheat mode in motor 4 inner loop.
In addition, a part for the cooling water circulating at major loop 8 is used to the cooling of the first cooler for recycled exhaust gas 6, and the cooling water that has flow through the first cooler for recycled exhaust gas 6 is returned major loop 8 by foldback.Herein, the cooling water of the first cooler for recycled exhaust gas 6 use, from the interior derivation of motor 4 and 6 circulations of this first cooler for recycled exhaust gas, is delivered to above-mentioned interflow portion 34, and with the interflow such as cooling water of carrying out autonomous radiator 16, and foldback postbacks motivation 4 again.
In addition, it is stable that the circulation form of the cooling water of the first cooler for recycled exhaust gas 6 keeps, not because the operating condition of motor 4 changes.
On the other hand, sub-loop 12 forms different from the major loop 8 of cooled engine 4, chilled(cooling) water return (CWR) independently.Cooling water in this sub-loop 12 becomes: driven by the second pump 30, circulate at sub-radiator 28, flow through the second cooler for recycled exhaust gas 10, returned the current of the second pump 30 by foldback again.
In this case, the second pump 30 is motor-drive pump, need to not undertaken in cooling situation by the second cooler for recycled exhaust gas 10, also can not drive this second pump 30.
Next situation when motor is stable state is described.
In this case, the lower limit of the temperature of the water temperature of the cooling water of major loop 8 when from above-mentioned stable state is in the scope of CLV ceiling limit value (85 DEG C～95 DEG C).
First major loop 8 is described.The main control valve 20 of major loop 8 detects the water temperature of cooling water, and becomes the state that valve is opened, and cooling water flows to main radiator 16 through major loop 8.
On the other hand, sub-control valve 22 also becomes the state that valve is opened, and cooling water flows through sub-control valve 22, flows to main radiator 16 through major loop 8; For sub-loop 12, valve is the state of cutting out, and does not flow to the second bypass loop 31.
In addition, in the temperature range of the cooling water in the time of stable state, main control valve 20 changes repeatedly switch (state is opened in centre) according to water temperature, thus, cooling water flow is to main radiator 16 or flow to the first bypass loop 27, thereby the temperature of maintenance cooling water is stable.
The circulation form of the common cooling water while being stable state as motor 4, the cooling water being driven by the first pump 18 is at motor 4 internal circulations, flow to sub-control valve 22 from main control valve 20 (with respect to major loop for opening) via major loop 8, be delivered to main radiator 16 from this sub-control valve 22 (with respect to major loop for opening, being complete shut-down with respect to sub-loop), and returned the first pump 18 by foldback again, circulation in major loop 8.
Next sub-loop 12 is described.Utilize above-mentioned the second pump 30, formed circulation loop major loop 8, relevant to the sub-loop 12 of cooling water that is independent of cooled engine 4.
This sub-loop 12, if there is no inflow and the outflow of cooling water, just conduct is independently possessed a certain amount of cooling water in loop.If even produce negative pressure and reduced pressure in loop at the branched portion 14 from sub-loop 12 to major loop 8, cooling water also can not flow out to major loop 8 from sub-loop 12.
When motor 4 is stable state, as the circulation form of the cooling water in sub-loop 12, is driven and in the interior circulation of sub-radiator 28, flow through the second cooler for recycled exhaust gas 10 by the second pump 30, being returned the second pump 30 by foldback again, in the interior circulation of sub-loop 12.This sub-loop 12 is loops of the low water temperature of cooling water compared with major loop 8.The cooling water inflow of sub-loop 12 is for example 30L/min.
Next situation when motor is high loaded process is described.
In this case, the temperature upper limit (95 DEG C) when the water temperature of the cooling water of major loop 8 exceedes above-mentioned stable state.At this temperature, motor is in the state by before overheated.
If the water temperature of cooling water exceedes above-mentioned CLV ceiling limit value, the main control valve 20 of major loop 8 detects the water temperature of cooling water on the one hand, becomes the state that valve is opened; On the other hand, the sub-control valve 22 of major loop 8 detects the water temperature of this cooling water, is reduced into the state of closing a little from the state of opening.And the cooling water of major loop 8 is shunted to the second bypass loop 31 by sub-control valve 22, flows to sub-loop 12.
But sub-control valve 22 is the degree of closing a little (there is no complete shut-down) to the stream of major loop 8, a part for cooling water is shunted to sub-loop 12, and all the other circulate at major loop 8.In this case, can become the resistance by increasing major loop 8 sides, increase to the structure of the flow of sub-loop 12.
Now, according to the opening degree difference of sub-control valve 22, the part of the cooling water of major loop 8 shunting (for example 50L/min), through the second pump 30 at sub-loop 12 circulate (interflow).Now, the amount of the cooling water in sub-loop 12 is that original amount (30L/min) adds the amount (50L/min) flowing into from above-mentioned major loop.
Then, the cooling water of sub-loop 12 (30+50L/min) is cooling through sub-radiator 28, in the interior circulation of the second cooler for recycled exhaust gas 10, and arrives the second pump 30.In the cooling water of these sub-loop 12 interior circulations, the water yield (50L/min) of shunting from major loop 8 is returned major loop 8 by foldback again from branched portion 14.
The circulation form of the cooling water in major loop 8, identical during with above-mentioned stable state except the shunting that above-mentioned sub-control valve 22 carries out, the cooling water being driven by the first pump 18 is at motor 4 internal circulations, flow to sub-control valve 22 from main control valve 20 (opening), be delivered to main radiator 16 from this sub-control valve 22 (opening), and again returned the first pump 18 by foldback.
Fig. 2 illustrates the circulation form of the cooling water in sub-loop 12 (with a part for major loop 8).
A part for the cooling water of major loop 8 is shunted (50L/min) from sub-control valve 22, flows into the entrance of the second pump 30 via the second bypass loop 31.In addition, also exist via aftermentioned the 3rd bypass loop 32, flow into the loop of the sub-loop 12 in the second pump downstream.
And, flow through the entrance of branched portion 14 via cooling water (30L/min) inflow second pump 30 of sub-loop 12.
Then, cooling water is at the entrance interflow of above-mentioned the second pump 30 (30+50L/min), and then through the outlet of the second pump 30, via sub-loop 12 in the interior circulation of sub-radiator 28.
In this sub-radiator 28 flows through the cooling water of the second cooler for recycled exhaust gas 10, the cooling water (50L/min) shunted at the branched portion 14 of sub-loop 12, via sub-bypass loop 36 and interflow portion 34, further driven by the first pump 18, in the interior circulation of motor 4, and flow through major loop 8, through main control valve 20, arrive above-mentioned sub-control valve 22.
In addition, the cooling water (30L/min) of not shunting from the branched portion 14 of above-mentioned sub-loop 12 continues to circulate in sub-loop 12, flows into above-mentioned the second pump 30.
Thus, sub-loop 12 is subordinated to major loop 8, is contributed to motor 4 cooling of major loop 8 by the cooling cooling water of the sub-radiator 28 of sub-loop 12.Like this, in the time of motor 4 high loaded process, carry out the switching controls of the current of cooling water, in order to compensate the decline of main radiator 16 heat dissipating capacities, use the sub-radiator 28 to low water temperature by water quench.
Fig. 3 is the block diagram that the formation of the cooling unit 40 of the related motor of other forms is shown.
Herein, for the formation of the cooling unit 40 of this motor, identical label mark for the structure member same with the cooling unit 2 of above-mentioned motor, detailed explanation is omitted.
In this cooling unit 40, be provided with the 3rd bypass loop 32 of the second bypass loop 31 of the cooling unit 2 that replaces above-mentioned motor, make the cooling water of the major loop 8 of being shunted by sub-control valve 22 collaborate sub-loop 12.
The 3rd bypass loop 32 is communicated with sub-control valve 22 with the sub-loop 12 of the second pump 30 downstream sides (between the second pump 30 and sub-radiator 28).The 3rd bypass loop 32 has got around the second pump 30.By getting around this second pump 30, can avoid the caused impact on the second pump 30 of hydraulic pressure (output than the second pump 30 is large) because of the first pump 18.
In addition, utilizing above-mentioned sub-control valve 22, a part for cooling water is flowed into the situation of sub-loop 12 from major loop 8 via the 3rd bypass loop 32, also can not make the second pump 30 drive.
Under the state that does not make this second pump 30 drive, cooling water can circulate in this pump.In this case, can predict: flow into the cooling water of sub-loop 12 from sub-control valve 22 via the 3rd bypass loop 32, in sub-loop 12 reverse flows, flow through the second pump 30 and circulate to the first low pump 18 of pressure.
Therefore, between the branched portion 14 of sub-loop 12 and the second pump 30, one-way valve 37 is set, prevents the reverse flow of above-mentioned sub-loop 12.
According to above-mentioned the 3rd bypass loop 32, sub-loop 12 becomes the form that is subordinated to major loop 8, in addition, exports highly due to the first pump 18 to the second pumps 30 of major loop 8, therefore can the two cooling water of major loop 8 and sub-loop 12 be circulated with the first pump 18.According to above-mentioned the first pump 18, except the driving of major loop 8, can also circulate and drive via the 3rd bypass loop 32 from major loop 8 to sub-loop 12, and again return to the cooling water in the loop of major loop 8 from this sub-loop.Therefore, do not need to utilize the second pump 30 to drive.
This cooling unit 40 is except above-mentioned the 3rd bypass loop 32 and relative loop, all identical with structure, the loop of the cooling unit 2 of above-mentioned motor.
In this cooling unit 40, temperature upper limit when if the water temperature of the cooling water of major loop 8 exceedes above-mentioned stable state (95 DEG C), the sub-control valve 22 of major loop 8 detects the water temperature of this cooling water, thereby is reduced into the state of closing a little from opening state.And cooling water is shunted to the 3rd bypass loop 32 by sub-control valve 22, flow to sub-loop 12 through the 3rd bypass loop 32.
Thus, sub-loop 12 is subordinated to major loop 8, as mentioned above by the cooling cooling water of the sub-radiator 28 of sub-loop 12, contributes to motor 4 cooling of major loop 8.
Therefore, according to above-mentioned mode of execution, the cooling capacity of the sub-radiator that the low water temperature arranging in order to improve specific fuel consumption is used, as the radiator of interim (when high loaded process) auxiliary main radiator and use, size accordingly main radiator can be set as thus with low, middle load running time.Therefore can form the main radiator that has carried out miniaturization compared with existing, avoid the maximization of main radiator, in addition, contribute to effective utilization of the reduction of cost and the mounting space of radiator.
Next, the cooling unit 42 of the related motor of the second mode of execution is described.
Fig. 4 is the block diagram that the formation of the cooling unit 42 of this motor is shown.
Herein, about the structure of the cooling unit 42 of this motor, the identical label mark for structure member that the cooling unit 2 of the motor related with above-mentioned the first mode of execution is same, detailed explanation is omitted.
This cooling unit 42 has: the major loop 8 that cooling water is circulated at main radiator 16 and motor 4; And the sub-loop 12 that the cooling water of low water temperature is circulated between sub-radiator 28, the second cooler for recycled exhaust gas 10 and interstage cooler 38.
Like this, in this sub-loop 12, interstage cooler 38 is set.
Be provided with at above-mentioned major loop 8: motor 4, main radiator 16, the first pump 18, main control valve 20, sub-control valve 22 and the first cooler for recycled exhaust gas 6.In addition, be provided with the first bypass loop 27 and the second bypass loop 31 at major loop 8.
Above-mentioned sub-loop 12 is provided with: sub-radiator 28, the second cooler for recycled exhaust gas 10, the second pump 30 and interstage cooler 38.
Above-mentioned interstage cooler 38 is set to: the state that the sub-loop 12 from the second pump 30 to sub-radiator 28 is diverged, the cooling water distributing is flowed into.The cooling water flowing out from this interstage cooler 38 collaborates in the sub-loop 12 in the second cooler for recycled exhaust gas 10 downstreams.
This cooling unit 42 is except above-mentioned interstage cooler 38 and relative loop, all identical with structure, the loop of the engine cooling apparatus 2 of above-mentioned the first mode of execution.
Above-mentioned interstage cooler 38 shows the example that is formed in the sub-loop 12 of circulation between sub-radiator 28.Therefore, this cooling unit 42 is as jointly forming the cooler arrangement of circulation loop with sub-radiator 28, and to be provided with the structure of interstage cooler 38 and the second cooler for recycled exhaust gas 10.
About this cooling unit 42, the circulation form (except the related circulation of above-mentioned interstage cooler 38) of the cooling water circulating according to the operational situation of motor 4 and in major loop 8 and sub-loop 12 is all identical with the cooling unit 2 of above-mentioned motor.
In addition, be provided with branched portion 14 in sub-loop 12, the cooling water circulating in sub-loop 12 according to predetermined condition flows into major loop 8 from this branched portion 14, in the interior circulation of motor 4, and again returns sub-loop 12 from major loop 8 foldbacks.Thus, sub-loop 12 is subordinated to major loop 8, is contributed to motor 4 cooling of major loop 8 by the cooling cooling water of the sub-radiator 28 of sub-loop 12.
So, according to this second mode of execution, same with above-mentioned the first mode of execution, size accordingly main radiator can be set as with low, middle load running time, avoid the maximization of main radiator, in addition, contribute to effective utilization of the reduction of cost and the mounting space of radiator.
Next, the cooling unit 44 of the related motor of the 3rd mode of execution is described.
Fig. 5 is the block diagram that the formation of the cooling unit 44 of this motor is shown.
Herein, about the formation of the cooling unit 44 of this motor, the identical label mark for structure member that the cooling unit 2 of the motor related with above-mentioned the first mode of execution is same, detailed explanation is omitted.
The cooling unit 44 of this motor has following 2 loops: the major loop 8 of the cooling water of cooled engine 4; And the cooling water that utilizes low water temperature carries out cooling sub-loop 12 to the second cooler for recycled exhaust gas 10 and the first cooler for recycled exhaust gas 6.
Above-mentioned major loop 8 is provided with: motor 4, main radiator 16, the first pump 18, main control valve 20 and sub-control valve 22.In addition, major loop 8 is provided with the first bypass loop 27 and the second bypass loop 31.
Above-mentioned sub-loop 12 is provided with sub-radiator 28, the second cooler for recycled exhaust gas 10, the first cooler for recycled exhaust gas 6 and the second pump 30.
This sub-loop 12 forms: make to circulate in the second cooler for recycled exhaust gas 10 from the cooling water of sub-radiator 28, and it is circulated in the first cooler for recycled exhaust gas 6, and foldback returns the circulation loop of sub-radiator 28 again.
This cooling unit 44 is except the relevant loop of above-mentioned the second cooler for recycled exhaust gas 10, all identical with structure, the loop of the cooling unit 2 of the motor of above-mentioned the first mode of execution.
About this cooling unit 44, the circulation form (except the related circulation of above-mentioned the second cooler for recycled exhaust gas 10) of the cooling water circulating according to the operational situation of motor 4 and in major loop 8 and sub-loop 12 is all identical with the cooling unit 2 of above-mentioned motor.
In addition, be provided with branched portion 14 in sub-loop 12, the cooling water circulating in sub-loop 12 according to predetermined condition flows into major loop 8 from this branched portion 14, in the interior circulation of motor 4, and again returns sub-loop 12 from major loop 8 foldbacks.Thus, sub-loop 12 is subordinated to major loop 8, contributes to motor 4 cooling of major loop 8 through the cooling cooling water of the sub-radiator 28 of sub-loop 12.
Therefore, according to the 3rd mode of execution, same with above-mentioned the first mode of execution, size accordingly main radiator can be set as with low, middle load running time, avoid the maximization of main radiator, in addition, contribute to effective utilization of the reduction of cost and the mounting space of radiator.
Describe the present invention in detail with reference to specific mode of execution, but those skilled in the art will appreciate that without departing from the spirit and scope of the present invention, can apply various changes, correction.
Japanese patent application, the application number 2011-258712 of the application based on application on November 28th, 2011, its content is incorporated to herein as reference herein.
Claims (8)
1. a cooling unit for motor, is characterized in that, has:
Main radiator, described main radiator carries out cooling to the cooling water circulating in motor;
Major loop, described major loop is the loop of the cooling water that circulates between described motor and described main radiator;
The first pump, described the first pump is arranged on the upstream side of the described motor of described major loop, circulates and drives described cooling water;
Sub-radiator, described sub-radiator and described major loop are independent, and the cooling water used to the cooler arrangement of cooling vehicle-mounted heater carries out cooling;
Sub-loop, described sub-loop is the loop of the cooling water that circulates between described cooler arrangement and described sub-radiator;
The second pump, described the second pump is arranged on described sub-loop midway, circulates and drives the cooling water of this sub-loop; And
Sub-control valve, described sub-control valve detects the temperature of the cooling water of described major loop, and the temperature upper limit of cooling water while exceeding described engine steady state in this temperature, by the part shunting of the cooling water of carrying to described main radiator, carry to described sub-loop
Carry out coolingly to be transported to the cooling water of described sub-loop by described sub-control valve with described sub-radiator, and make it flow into described cooler arrangement, and the cooling water shunting of described sub-loop foldback are returned to the upstream side of described first pump of described major loop.
2. the cooling unit of motor as claimed in claim 1, is characterized in that,
Be provided with main control valve, described main control valve detects the temperature of the cooling water of described major loop, and the lowest temperature value of cooling water while not reaching described engine steady state in this temperature, the cooling water foldback that flows through described motor is postbacked to motivation, carry out the preheating of motor; When described temperature is described lower limit when above, by flowing through part or all of cooling water of described motor, carry to the described main radiator of major loop.
3. the cooling unit of motor as claimed in claim 1 or 2, is characterized in that,
The lower limit of the temperature of cooling water when described engine steady state is that 80 DEG C, CLV ceiling limit value are 100 DEG C.
4. the cooling unit of motor as claimed in claim 1 or 2, is characterized in that,
The lower limit of the temperature of cooling water when described engine steady state is that arbitrary value, the CLV ceiling limit value in the scope of 70 DEG C～90 DEG C is the arbitrary value in the scope of 90 DEG C～120 DEG C.
5. the cooling unit of the motor as described in any one in claim 1 to 4, is characterized in that,
Be provided with bypass loop, described bypass loop will be carried to the upstream side of described the second pump or the sub-loop in downstream side by the cooling water of described sub-control valve shunting.
6. the cooling unit of the motor as described in any one in claim 1 to 5, is characterized in that,
At the derivation circulation loop of cooling water being shunted from described major loop, be provided with cooler for recycled exhaust gas.
7. the cooling unit of the motor as described in any one in claim 1 to 5, is characterized in that,
Be provided with cooler for recycled exhaust gas in described sub-loop midway.
8. a cooling means for motor, is characterized in that,
Right to use requires the cooling unit of the motor described in any one in 1 to 7, a part for the cooling water of described major loop is transported to described sub-loop, with described sub-radiator, this cooling water is carried out coolingly, and foldback returns the upstream side of the motor of described major loop again.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-258712 | 2011-11-28 | ||
| JP2011258712A JP2013113182A (en) | 2011-11-28 | 2011-11-28 | Cooling apparatus for engine and cooling method thereof |
| PCT/JP2012/080646 WO2013080980A1 (en) | 2011-11-28 | 2012-11-27 | Engine cooling apparatus and engine cooling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103987935A true CN103987935A (en) | 2014-08-13 |
Family
ID=48535431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280058311.2A Pending CN103987935A (en) | 2011-11-28 | 2012-11-27 | Engine cooling apparatus and engine cooling method |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20140326198A1 (en) |
| EP (1) | EP2787189A4 (en) |
| JP (1) | JP2013113182A (en) |
| CN (1) | CN103987935A (en) |
| WO (1) | WO2013080980A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757227A (en) * | 2018-06-04 | 2018-11-06 | 广西玉柴机器股份有限公司 | Independent cooling system for recycled exhaust gas |
| CN110017206A (en) * | 2016-04-28 | 2019-07-16 | 株式会社斯巴鲁 | Vehicle |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208528B (en) * | 2015-02-06 | 2019-01-29 | 本田技研工业株式会社 | The cooling controller of internal combustion engine |
| US10202886B1 (en) * | 2015-05-02 | 2019-02-12 | Darius Teslovich | Engine temperature control system |
| JP6582848B2 (en) * | 2015-10-08 | 2019-10-02 | いすゞ自動車株式会社 | Engine cooling system |
| JP6790723B2 (en) * | 2016-10-26 | 2020-11-25 | いすゞ自動車株式会社 | Internal combustion engine |
| KR20200040996A (en) | 2018-10-11 | 2020-04-21 | 현대자동차주식회사 | Hvac of a vehicle |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2013080980A1 (en) | 2013-06-06 |
| US20140326198A1 (en) | 2014-11-06 |
| JP2013113182A (en) | 2013-06-10 |
| EP2787189A4 (en) | 2015-05-20 |
| EP2787189A1 (en) | 2014-10-08 |
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Application publication date: 20140813 |