EP2573354A1 - Circuit de refroidissement d'un moteur a combustion interne avec radiateur basse temperature - Google Patents

Circuit de refroidissement d'un moteur a combustion interne avec radiateur basse temperature Download PDF

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Publication number
EP2573354A1
EP2573354A1 EP12194138A EP12194138A EP2573354A1 EP 2573354 A1 EP2573354 A1 EP 2573354A1 EP 12194138 A EP12194138 A EP 12194138A EP 12194138 A EP12194138 A EP 12194138A EP 2573354 A1 EP2573354 A1 EP 2573354A1
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EP
European Patent Office
Prior art keywords
coolant
main
thermostat
radiator
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12194138A
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German (de)
English (en)
Inventor
Dr.-Ing. Klaus Haßdenteufel
Stefan Rogg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP2573354A1 publication Critical patent/EP2573354A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0234—Header boxes; End plates having a second heat exchanger disposed there within, e.g. oil cooler
    • 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
    • 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
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
    • F01P2003/185—Arrangements or mounting of liquid-to-air heat-exchangers arranged in parallel
    • 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
    • F01P2007/168—By varying the cooling capacity of a liquid-to-air heat-exchanger
    • 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
    • F01P2050/00—Applications
    • F01P2050/02—Marine engines
    • F01P2050/06—Marine engines using liquid-to-liquid heat exchangers
    • 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
    • F01P2060/04—Lubricant cooler
    • F01P2060/045—Lubricant cooler for transmissions
    • 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
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers

Definitions

  • the invention relates to a cooling circuit of an internal combustion engine of motor vehicles according to the preamble of claim 1 and a coolant radiator of a cooling circuit of an internal combustion engine according to the preamble of claim 11 - both known from the DE-A 196 37 817 ,
  • a cooling circuit of an internal combustion engine with a low-temperature radiator which is connected in series with a main radiator coolant side.
  • a main coolant stream flows through the main cooler, from which a partial stream is branched off in an outlet-side collecting box and conveyed through the low-temperature cooler in the opposite direction to the main stream.
  • the diversion of the partial flow is effected by a partition wall arranged in an inlet edge of the coolant radiator.
  • the inlet box thus has two chambers, namely a main chamber for the main coolant flow and a secondary chamber for the exiting partial flow, which flows through the entire radiator two times and is thus cooled more.
  • the partial flow exiting the secondary chamber is used for the cooling of transmission oil and, if necessary, mixed with coolant from an expansion tank.
  • the mixture of the two partial flows takes place through a valve unit, from which the conditioned coolant is supplied to the transmission oil cooler for cooling or preheating.
  • the cooling circuit further includes a main or engine thermostat, which is arranged in the radiator return, ie the coolant side behind the main radiator.
  • the known cooling circuit or the known coolant radiator have various disadvantages: initially, the series connection in a radiator block results in a reduced thermodynamic effectiveness of the entire radiator.
  • the average temperature difference between the coolant and the cooling air is lower in the low-temperature cooler than in the main cooler, and thus the average temperature difference between the coolant and the cooling air for the entire unit is lower.
  • a further simplified form of transmission oil cooling is known by the arrangement of a transmission oil cooler in the outlet water box of a coolant radiator, z. B. by the DE-A 197 11 259 , Again, no control of the amount of coolant is possible, and during the warm-up phase of the engine, the transmission oil cooler is cut off from the coolant flow.
  • the invention is applicable to refrigeration circuits in which the main thermostat is arranged either in the radiator feed or in the radiator return.
  • the separation of the partial flow from the main flow takes place through a partition wall arranged in the outlet-side collecting box or a "leaky separating wall", ie a dividing wall which is provided with a throttle point.
  • a valve may be arranged in the partition wall in order to influence the coolant quantity of the main and partial flow.
  • the output of the low-temperature radiator is connected to the main thermostat, the bypass or the radiator run-in, even in the warm-up phase of the engine, ie when the main thermostat is closed, the transmission oil cooler with a sufficient Supply coolant.
  • a mixing thermostat is used in the return of the low-temperature radiator, which controls the mixing temperature from the return of the low-temperature radiator and from the engine-side inlet for the transmission oil cooler inlet.
  • an opening or warm-up thermostat is arranged in the motor-side inlet for the mixing thermostat, which prevents a supply of cold coolant. This can prevent excessive transmission oil cooling and excessive transmission oil heating during engine warm-up. This reduces fuel consumption and emissions, improves the heating comfort and the service life of the transmission oil.
  • the main region and the low-temperature region consist of a common tube / fin block, which is flowed through in parallel, d. H. there is no precooling of the partial flow instead.
  • the mean temperature difference in the tubes of the main area and those of the low temperature area is lower, so that there are no harmful voltages for the radiator block.
  • the low-temperature part is flowed through in the opposite direction for a second time by a so-called deflection in the depth. As a result, the outlet temperature of the partial flow can be lowered even further.
  • Fig. 1 shows a cooling circuit of an internal combustion engine 1 of a motor vehicle, not shown. Heated coolant enters from an engine return line 1a into a main thermostat 2, to which a radiator feed 3 and a short circuit or bypass 4 are connected.
  • the course 3 opens into a cooler 5 with an inlet box 6 and an outlet-side collecting box 7.
  • the cooler 5 has a main area 5a and a low-temperature area 5b, which are flowed parallel to each other by a main coolant flow and a kuhimittetnext or partial flow.
  • the outlet-side collection box 7 has two chambers 7a, 7b, which are separated from each other by a partition wall 7c.
  • the inlet-side collection box 6, however, is continuous, ie without a partition. From the main chamber 7a enters the main coolant flow in the radiator return 8, combines at the junction point 9 with the bypass 4 and is fed back via a coolant pump 10 via the engine supply line 1b in the internal combustion engine 1.
  • the low-temperature region 5b and the outlet-side secondary chamber 7b are adjoined by a low-temperature cooler return 11, which is fed into the radiator return 8 at the junction 12.
  • a transmission oil cooler 13 is turned on.
  • a mixing thermostat 14 is turned on in the return 11, which is connected via a branch line 15, in which an opening or warm-up thermostat 16 is turned on, with the main thermostat 2.
  • the function of the refrigerating cycle is as follows: in warm engine 1, the main thermostat is fully opened to the radiator feed 3 and closed to the bypass line 4, ie, the refrigerant flows into the radiator 5 where both regions, the main region 5a and the low temperature region 5b, are parallel flows through.
  • the main flow passes through the radiator return 8 and the coolant pump 10 back into the internal combustion engine 1.
  • the partial flow cooled in the low-temperature region 5b passes via the return 11 into the mixing thermostat 9, where, if required, warm coolant exits from the engine 1a via the branch line 15 is mixed to control the transmission oil cooling.
  • the main thermostat 2 is closed to the radiator inlet 3 and fully open to the bypass line 4. Through the radiator 5 no coolant flows, but rather through the bypass line 4 to the engine inlet 1b.
  • the mixing thermostat 14 and the downstream transmission oil cooler 13 thus receive no cold coolant. Rather, the mixing thermostat 14 receives only warm coolant from the engine outlet 1a. Since the coolant at the engine outlet 1a has not yet reached the operating temperature in this operating state, the possibility for cooling the transmission oil is given sufficiently. At the beginning of the engine warm-up, the situation arises that the transmission oil is colder than the coolant. The transmission oil is then heated in the transmission oil cooler 13 by the coolant flow.
  • the heating of the transmission oil is useful within certain limits, as this the transmission oil quickly reaches the operating temperature and the friction losses are reduced in the transmission.
  • the inflow of warm coolant from the engine outlet 1a to the mixing thermostat 14 and to the downstream transmission oil cooler 13 can be prevented by the warm-up thermostat 16. This opens only when the coolant at the engine outlet 1a, has reached a certain temperature.
  • the main thermostat operates in the control range, it is partially open to the radiator inlet 3 and to the bypass line 4.
  • the mixing thermostat 14 is then supplied with cold coolant from the low-temperature region 5b and with warm coolant from the engine outlet 1a, from which the suitable for Gereteöltemper réelle coolant temperature is mixed together.
  • Fig. 2 shows a variant of the first cooling circuit according to Fig. 1 , wherein like reference numerals are used for the same parts.
  • the main thermostat 2 is arranged here in the return 8 of the coolant cooler 5.
  • the coolant flows through the radiator feed 3 to the radiator 5, which flows through it in parallel in a main flow and a partial flow.
  • the partial flow enters via the auxiliary chamber 7b in the return line 11, in which the mixing thermostat 14 and the transmission oil cooler 13 are connected.
  • the return 11 is fed at the junction 17 in the bypass power 4 and the flow of the coolant pump 10.
  • the mixing thermostat 14 hot coolant from the engine outlet 1a and the radiator inlet 3 is mixed if necessary, via a branch line 18 in which the opening or warm-up thermostat 16 is connected.
  • the main thermostat 2 is closed to the radiator return 8 and opened to the engine outlet 1a, then no coolant flows through the main part 5a of the radiator 5. Instead, the main coolant flow via the short circuit 4 is led directly to the coolant pump 10. This condition occurs during engine warm-up or at least temporarily during winter operation. Depending on the position of the mixing thermostat 14, a coolant partial flow can also pass through the low-temperature part 5b in this case. At the mixing thermostat 14 is then cold coolant from the low-temperature part 5b and warm coolant from the engine outlet 1a and the radiator via the branch line 18, so that the temperature of the transmission oil cooler 13 flowing coolant can be controlled by the mixing thermostat 14.
  • the transmission oil is colder than the coolant.
  • the transmission oil is then heated in the transmission oil cooler 13 by the coolant flow.
  • the inflow of the warm coolant from the engine outlet 1a or from the radiator forerunner 3 to the mixing thermostat 14 can be prevented by the warm-up thermostat 16.
  • the warm-up thermostat 16 opens only when the coolant has reached a certain temperature at the engine outlet 1a or in the radiator feed 3.
  • the flow through the low-temperature part 5b would also represent a loss of heat for the coolant circuit, it is in this case prevented by the mixing thermostat 14 is closed to the low-temperature part 5b, because the coolant temperature at the outlet of the low-temperature part 5b is well below the target temperature for the outlet of the mixing thermostat 14.
  • the mixed thermostat 14 is also supplied in this case with cold coolant from the low-temperature part 5b and with warm coolant from the engine outlet 1a and the radiator 3, whereupon the temperature suitable for Gereteöltemper réelle coolant temperature is mixed together.
  • the mixing thermostat 14 may be an expansion thermostat, a map thermostat, or a foreign energy actuated control valve unit.
  • the control variable for the mixing thermostat 14 may be the temperature of the hot coolant from the engine outlet 1a or from the radiator feed 3, the coolant temperature at the outlet of the mixing thermostat 14, or the coolant temperature at the outlet of the transmission oil cooler 13.
  • the warm-up thermostat 16 can also be arranged between the mixed thermostat 14 and the transmission oil cooler 13, or between the engine outlet 1a and the radiator feed 3 in the main thermostat 2 arranged on the radiator-side. In the latter case, the warm coolant is supplied from the radiator feed 3 to the mixing thermostat 14.
  • the cooling circuits with transmission oil cooler 13 according to Fig. 1 and 2 can be simplified and thereby optimized in terms of cost by dispensing with the mixing thermostat 14 and only one warm-up thermostat 16 is used in each case. Such circuits will be described below.
  • Fig. 3 shows a simplified cooling circuit, in which the same reference numerals are used again for the same parts.
  • the main thermostat 2 is arranged in the radiator feed 3.
  • Via a branch line 19 from the bypass 4 16 refrigerant is fed into the return 11 via the thermostatic thermostats.
  • the coolant flows into the coolant radiator 5. From the outlet of the low temperature range 5b the cooled coolant partial flow enters the transmission oil cooler 13. Thereafter, the return 11 at the junction 12 in the radiator return 8 fed.
  • the transmission oil is then heated in the transmission oil cooler 13 by the coolant flow. It is advantageous to allow the heating of the transmission oil only after a certain period of time after the engine warm-up. This is achieved by the warm-up thermostat 16 opens only when the coolant at the engine outlet 1a and in the bypass line 4 has reached a certain temperature.
  • the main thermostat 2 If the main thermostat 2 operates in the control range, it is partially open to the radiator inlet 3 and to the bypass line 4.
  • the transmission oil cooler 13 is then supplied with a mixture of cold coolant from the low-temperature region 5b and warm coolant from the engine outlet 1a.
  • Fig. 4 shows a simplified refrigeration cycle in which the same reference numerals are again used for the same parts.
  • the main thermostat 2 is arranged here in the radiator return 8.
  • the warm-up thermostat 16 and the transmission oil cooler 13 are arranged in the return 11 of the low temperature range 5 b or the low-temperature radiator 5 b.
  • the return 11 is brought together after its exit from the transmission oil cooler 13 at the junction 20 with the short-circuit line 4 and supplied from there to the coolant pump 10.
  • the main thermostat 2 If the main thermostat 2 is closed to the radiator return 8 and fully opened towards the engine outlet 1a, no coolant flows through the main region 5a of the radiator 5. Instead, the main coolant flow is led directly to the coolant pump 10 via the short circuit 4. This condition occurs during warm-up or at least partially during winter operation. Depending on the position of the opening or warm-up thermostat 10, a coolant partial flow can also pass through the low-temperature cooler 5b in this case. From the opening thermostat 16 flows to the transmission oil cooler 13 to cold coolant. The opening thermostat 16 ensures that the coolant has a minimum temperature, so that excessive cooling of the transmission oil is prevented. At the beginning of the engine warm-up, the situation arises that the transmission oil is colder than the coolant.
  • the transmission oil is then heated in the transmission oil cooler 13 by the coolant flow. It is advantageous to allow the heating of the transmission oil only after a certain period of time after the start of the engine warm-up. This is achieved by the warm-up thermostat 16 opens only when the coolant has reached a certain temperature at the outlet of the low-temperature radiator 5b.
  • the transmission oil cooler 13 is also supplied in this case from the low-temperature part 5b with cold coolant, which, however, has a minimum temperature due to the warm-up thermostat 16.
  • Fig. 1 to 4 To the cooling circuits described above according to Fig. 1 to 4 in addition, it is stated that these are shown simplified insofar as, for example, an expansion tank and a heating circuit are not shown. Warm coolant can also be supplied to the mixing thermostat or the transmission oil cooler from the expansion tank.
  • a transmission oil cooler selected only as an example as additional heat exchanger. The latter can also be replaced by another consumer, ie another heat exchanger or an electronic component to be cooled.
  • the opening thermostat 16 may be - like the mixing thermostat 9 - a Dehnstoffthermostat, a map thermostat or operated by external energy valve unit. This also applies to the main thermostat 2.
  • the warm-up thermostat 16 can also be arranged between the transmission oil cooler 13 and the junction 12, 17, 20.
  • the opening time of the warm-up thermostat 16 then also depends significantly on the transmission oil temperature. At low temperatures of the transmission oil and the coolant, the warm-up thermostat 16 is closed, and the transmission oil is neither heated nor cooled. At high temperature of the coolant and low temperature of the transmission oil, the warm-up thermostat 16 is opened, and the transmission oil is heated. At low or high temperature of the coolant and high temperature of the transmission oil, the warm-up thermostat 16 is opened, and the transmission oil is cooled.
  • Fig. 5 shows a coolant cooler 50
  • the in Fig. 1 represented coolant cooler 5 corresponds, wherein the transmission oil cooler 13 and the mixing thermostat 14 shown there are combined with the coolant radiator to form a structural unit 50.
  • the coolant cooler 50 has a unitary tube / fin block consisting of a main area 50a and a minor area 50b.
  • the unillustrated tubes of this tube / fin view 50a, 50b open on the one hand into a coolant inlet box 51 with a coolant inlet 52 and into an outlet-side header box 52 with a coolant outlet 53.
  • the header box 52 is separated by a partition wall 54 into a main chamber 55 which into the outlet 53rd opens, and a secondary chamber 56 divided.
  • the partition wall 54 is sealed in the illustrated embodiment, but it may also have a throttle point, not shown, or a valve, so that both chambers 55, 56 can communicate with each other.
  • the main chamber 55 is divided by a longitudinal partition wall 57, so that a mixing chamber 58 results, which, however, communicates with the main chamber 55 in the region of the outlet opening 53.
  • a transmission oil cooler 59 is arranged with two outwardly leading transmission oil connections 59a, 59b.
  • a mixing thermostat 60 is integrated in the mixing chamber 58, which is in fluid communication with an inlet 60a with the secondary chamber 56 and with an outlet 60b with the mixing chamber 58.
  • a second input 60c of the mixing thermostat 60 can be connected to the coolant circulation described above.
  • the thermostatic cartridge 60 is sealed with seals against the receptacle in the collection box.
  • the longitudinal partition wall 57 may in one embodiment be an integral part of the header tank 52 or constitute an additional component.
  • the longitudinal partition 57 is then designed so that it seals in the assembly of the transmission oil cooler 59 in the collecting box 52.
  • corresponding sealing surfaces in the collecting box 52 and on the longitudinal partition wall 57 are provided.
  • a seal or the design of the partition is possibly a seal or the design of the partition as a hard / soft part with molded sealing lip.
  • the main area 50a and the low-temperature area 50b of the radiator 50 are flowed through in parallel, that is, in the direction of flow.
  • the coolant entering the mixing chamber 58 flows through the transmission oil cooler 59 and is then admixed with the main flow in the region of the outlet opening 53.
  • the dimensioning of the main flow and of the partial flow takes place in such a way that the coolant partial flow through the low-temperature part 50b accounts for approximately 4% to 15% of the total coolant flow which enters the cooler 50 through the coolant inlet 52.
  • the size of the low-temperature part 50 b is advantageously dimensioned such that the end face of the low-temperature part 50 b makes up between 10% and 40% of the end face of the cooler 50. In between, in the range of 20% to 30% area, results a preferred range.
  • the coolant cooler 50 is preferably installed as a cross-flow cooler, ie with horizontally extending tubes (not shown) in the motor vehicle. In this case, the low-temperature part 50b may be up or down, depending on the cooling air flow in the vehicle.
  • the main area 50a and the median temperature area 50b can be made in a tube / fin block with common tube sheets and header boxes.
  • the low-temperature part 50b can also be flowed through twice or more, for. B. by a deflection of the coolant in the depth, ie in the direction of the cooling air flow. As a result, a further lowering of the coolant temperature is achieved.
  • the low-temperature part can also be formed from a partial region of the cooler and additionally by a separate component.
  • the two segments of the low-temperature part which result in this design can be flowed through in parallel or one after the other by the coolant partial flow.
  • the low-temperature part segment which represents a separate component, can be arranged in the cooling air flow in front of the unit cooler which contains the other low-temperature part segment. If the two segments are successively flowed through by the coolant partial flow, the result is a similarly high thermodynamic effectiveness of the low-temperature part as with a deflection of the coolant in the depth.
  • An advantage of the design of the low-temperature part as a separate component or with a segment of the low-temperature part as a separate component is the reduced thermal cycling.
  • the radiator main part can simply flow through or have a deflection.
  • FIG. 12 shows another embodiment of a coolant radiator 61 similar to the coolant radiator 50 shown in FIG Fig. 5 is constructed, namely with a main cooling portion 61 a and a low-temperature region 61 b, each communicating with an inlet box 62 having a coolant inlet opening 63 and an outlet box 64 with an outlet opening 65.
  • a partition wall 66 is arranged, which divides this into a main chamber 67 and a secondary chamber 68. The main area 61a and the portion 61b are thus flowed through in parallel by the coolant.
  • Adjoining the secondary chamber 68 is a mixing chamber 69 into which a mixing thermostat 70 is inserted, which communicates on the output side both with the secondary chamber 68 and with the mixing chamber 69 and on the input side with the cooling circuit not shown here.
  • a mounting plate 71 is arranged, by means of which a transmission oil cooler 72 attached to the coolant radiator 61 and the coolant side connected to the mixing chamber 69 and the main chamber 67, via a coolant inlet channel 73 and a coolant outlet channel 74.
  • the transmission oil circuit, not shown is connected via the nozzles 72a, 72b.
  • this transmission oil cooler 72 has its own housing for guiding the coolant.
  • the housing is flange-like on its attachment side, clamped to the mounting plate 71 and sealed by a sealing plate 73 relative to the mounting plate 71.
  • Conventional coolant inlet and outlet nozzles can thus be omitted.
  • the mounting plate 71 is advantageously formed on the collecting box 64 and contains the two coolant channels 73, 74. The re-feeding of the coolant partial flow through the outlet channel 74, however, is recommended only for an arrangement of the main thermostat in the radiator feed.
  • the transmission oil cooler can be mounted with or without mounting plate on the water tank, on the fan cowl or on the module frame. Other mounting locations on the cooling module or away from the cooling module are possible.
  • the transmission oil cooler can be designed with or without its own housing for guiding the coolant.
  • inlet and outlet ports for coolant and transmission oil can be present.
  • the mixing thermostat can be integrated in the mounting plate or mounted directly on the transmission oil cooler. Further design possibilities result from the arrangement of the mixing thermostat in the coolant guides, wherein the mixing thermostat can be additionally attached to the radiator, the fan cowl, the module frame or at another location.
  • the opening thermostat can be integrated in the mounting plate or mounted directly on the transmission oil cooler. Further design possibilities result from the arrangement of the opening thermostat in the coolant guides, wherein the opening thermostat can be additionally attached to the radiator, the fan cowl, the module frame or at another location. Furthermore, it is possible to integrate the opening thermostat in the water box. The design options in this case correspond to those of the integration of the mixing thermostat in the water tank.
  • Cooling circuit of an internal combustion engine of motor vehicles with a main cooling circuit, consisting of a radiator 3, a main radiator 5a, a radiator return 8, a coolant pump 10, a main thermostat 2 and a bypass or short circuit 4 between the main thermostat 2 and coolant pump 10, and with a low-temperature circuit consisting from a low-temperature radiator 5b, a low-temperature radiator return 11, a valve unit and an additional heat exchanger, the low-temperature radiator 5b being connected in parallel to the main radiator 5a.
  • a main cooling circuit consisting of a radiator 3, a main radiator 5a, a radiator return 8, a coolant pump 10, a main thermostat 2 and a bypass or short circuit 4 between the main thermostat 2 and coolant pump 10, and with a low-temperature circuit consisting from a low-temperature radiator 5b, a low-temperature radiator return 11, a valve unit and an additional heat exchanger, the low-temperature radiator 5b being connected in parallel to the main radiator 5a.
  • Cooling circuit according to the above description, wherein the main thermostat 2 is arranged in the radiator feed 3.
  • Cooling circuit according to the above description, wherein the main thermostat 2 is arranged in the radiator return 8.
  • Cooling circuit according to the above description, wherein the additional heat exchanger is designed as a transmission oil cooler 13.
  • valve unit is formed as a mixed thermostat 14 with two inputs and an output, that the first input and the output are connected in the return 11 of the low-temperature cooler 5 b and the second input is connected to the main thermostat 2.
  • Cooling circuit according to the above description, wherein between the second input and the main thermostat 2, a warm-up thermostat 16 is connected.
  • valve unit is designed as a warm-up thermostat 16, which is connected between the return 11 of the low-temperature cooler 5 b and the bypass 4.
  • valve unit is designed as a mixed thermostat 14 with two inputs and an output, that the first input and the output connected in the return 11 of the low-temperature cooler 5 b and the second input is connected to the radiator 3.
  • valve unit is designed as a warm-up thermostat 16 which is connected in the return line 11 of the low-temperature radiator 5b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Details Of Gearings (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP12194138A 2003-01-16 2004-01-14 Circuit de refroidissement d'un moteur a combustion interne avec radiateur basse temperature Withdrawn EP2573354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10301564A DE10301564A1 (de) 2003-01-16 2003-01-16 Kühlkreislauf einer Brennkraftmaschine mit Niedertemperaturkühler
EP04701951.8A EP1588034B1 (fr) 2003-01-16 2004-01-14 Circuit de refroidissement d'un moteur a combustion interne avec radiateur basse temperature

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EP04701951.8 Division 2004-01-14

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EP2573354A1 true EP2573354A1 (fr) 2013-03-27

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DE10301564A1 (de) 2004-08-12
WO2004063543A3 (fr) 2004-10-28
EP1588034A2 (fr) 2005-10-26
JP2006515658A (ja) 2006-06-01
WO2004063543A2 (fr) 2004-07-29
EP1588034B1 (fr) 2013-05-22
JP4644182B2 (ja) 2011-03-02
US7406929B2 (en) 2008-08-05
US20060254538A1 (en) 2006-11-16

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