US20160003127A1 - Intake-air cooling device for engine and method for cooling engine - Google Patents

Intake-air cooling device for engine and method for cooling engine Download PDF

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Publication number
US20160003127A1
US20160003127A1 US14/770,719 US201414770719A US2016003127A1 US 20160003127 A1 US20160003127 A1 US 20160003127A1 US 201414770719 A US201414770719 A US 201414770719A US 2016003127 A1 US2016003127 A1 US 2016003127A1
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United States
Prior art keywords
cooling water
temperature
engine
intake
cooling
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.)
Abandoned
Application number
US14/770,719
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English (en)
Inventor
Konomu Sakagawa
Hirokazu YOKOSAMA
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.)
Tokyo Radiator Mfg Co Ltd
Marelli Corp
Original Assignee
Tokyo Radiator Mfg Co Ltd
Calsonic Kansei Corp
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 Tokyo Radiator Mfg Co Ltd, Calsonic Kansei Corp filed Critical Tokyo Radiator Mfg Co Ltd
Assigned to TOKYO RADIATOR MANUFACTURING CO LTD., CALSONIC KANSEI CORPORATION reassignment TOKYO RADIATOR MANUFACTURING CO LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAKAGAWA, Konomu, YOKOYAMA, HIROKAZU
Publication of US20160003127A1 publication Critical patent/US20160003127A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0412—Multiple heat exchangers arranged in parallel or in series
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0437—Liquid cooled heat exchangers
    • F02B29/0443—Layout of the coolant or refrigerant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • 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
    • 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
    • F01P2003/182—Arrangements or mounting of liquid-to-air heat-exchangers with multiple 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
    • F01P2060/02—Intercooler
    • 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
    • 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

Definitions

  • the invention relates to an intake-air cooling device provided on a supercharged engine.
  • An engine provided with a supercharger that supercharges intake air by using exhaust gas from the engine is generally used.
  • temperature of the intake air is increased to a high temperature.
  • the temperature of the intake air may be increased further to a higher temperature. If the temperature of the intake air is high, there is a risk that a fuel consumption efficiency is reduced.
  • a cooling device for decreasing the temperature of the supercharged intake air.
  • cooling water for an engine is allowed to flow into an intake air channel, and the temperature of the intake air is decreased with the cooling water.
  • the temperature of the cooling water for the engine is controlled so as to achieve an optimal temperature for operation of the engine, sufficiently large air-water temperature difference between the intake air and the cooling water cannot be achieved, and the decrease in the temperature of the intake air is limited.
  • a cooling device for an internal combustion engine including a second radiator on a second cooling water circuit branched off from a part of a cooling water circuit of the engine is described.
  • this cooling device the temperature of the intake air to be introduced into the engine is decreased with cooling water whose temperature has been decreased by the second radiator.
  • the low-temperature cooling water flows into an engine.
  • the cooling water temperature in the engine is decreased, and the warming up of the engine is delayed. If the warming up of the engine is delayed, there is a problem in that a fuel consumption performance of the engine is deteriorated.
  • This invention has been designed in consideration of the problems described above, and an object thereof is to provided an intake-air cooling device for an engine that is capable of improving the delay in the warming up of the engine while including a cooling device cooling intake air for the engine.
  • an intake-air cooling device for an engine that is provided on the engine including a cooling water circuit through which cooling water for the engine flows and a supercharger that supercharges intake air for the engine, comprises a first intake-air cooling device, a second intake-air cooling device, and a heat exchanger.
  • the cooling water circuit has a first cooling water circuit and a second cooling water circuit.
  • the first intake-air cooling device is configured such that the intake air is cooled with the cooling water in the first cooling water circuit
  • the second intake-air cooling device is configured such that, with the cooling water in the second cooling water circuit, the intake air that has been cooled by the first intake-air cooling device is further cooled.
  • the first cooling water circuit is configured such that the cooling water that has come out from the engine passes through the first intake-air cooling device and returns to the engine again;
  • the second cooling water circuit is configured such that the cooling water that has come out from the engine passes through the second intake-air cooling device and returns to the engine again.
  • the heat exchanger is configured to perform heat exchange between the cooling water that has come out from the engine and flowing to the first intake-air cooling device and the cooling water that has come out from the second intake-air cooling device and that is flowing to the engine.
  • FIG. 1 is an explanatory diagram of a cooling device according to a first embodiment of the present invention showing an engine at the center thereof.
  • FIG. 2 is an explanatory diagram of a cooling device according to a second embodiment of the present invention showing an engine at the center thereof.
  • FIG. 3 is a flowchart of processing executed by a controller according to the second embodiment of the present invention.
  • FIG. 4 is an explanatory diagram of a cooling device according to a third embodiment of the present invention showing an engine at the center thereof.
  • FIG. 1 is an explanatory diagram of a cooling device 1 according to a first embodiment of the present invention showing an engine 10 at the center thereof.
  • the cooling device 1 includes a supercharger (turbine) 18 and the engine 10 that is mounted on, for example, a vehicle so as to serve as a driving source of the vehicle, and uses cooling water (coolant) to suitably decrease a temperature of supercharged intake air.
  • a supercharger turbine
  • the engine 10 that is mounted on, for example, a vehicle so as to serve as a driving source of the vehicle, and uses cooling water (coolant) to suitably decrease a temperature of supercharged intake air.
  • thick arrows show a high-temperature-side cooling water circuit 31
  • narrow arrows show a low-temperature-side cooling water circuit 32
  • dotted lines show flows of exhaust gas in exhaust gas pipes 16
  • one-dot chain lines show flows of intake air in intake-air pipes 14 .
  • the cooling device 1 includes the engine 10 and a cooling water circuit 30 through which cooling water for the engine 10 flows.
  • the cooling-water flow path 11 is in communication with the cooling water circuit 30 .
  • the cooling-water flow path 11 includes a water pump (W/P) 12 and a thermostat (T/S) 13 .
  • the cooling water is circulated through the cooling-water flow path 11 and the cooling water circuit 30 by the water pump 12 .
  • a radiator 41 is bypassed by the thermostat 13 , and when the temperature of the cooling water is high, the cooling water temperature is decreased by guiding the cooling water to the radiator 41 .
  • the engine 10 is in communication with the intake-air pipes 14 and the exhaust gas pipes 16 .
  • the intake air is supercharged to the intake-air pipes 14 by the turbine 18 .
  • the temperature of the supercharged intake air is decreased by a high-temperature side intercooler (first intake-air cooling device) 71 and a low-temperature side intercooler (second intake-air cooling device) 72 , and the intake air whose temperature has been decreased is sent to the engine 10 .
  • the exhaust gas pipes 16 allow exhaust gas from the engine 10 to be discharged through the turbine 18 .
  • the exhaust gas rotates the turbine 18 , and the rotation of the turbine 18 makes the intake air in the intake-air pipes 14 to be supercharged.
  • the engine 10 includes a fan 19 .
  • the fan 19 sends wind to the radiator 41 and a sub-radiator 42 , the cooling at the radiator 41 and the sub-radiator 42 is facilitated.
  • An EGR circuit 20 is branched off from the exhaust gas pipes 16 .
  • the EGR circuit 20 forms an exhaust gas recirculation device (EGR) that recirculates a part of the exhaust gas into the intake air.
  • the EGR circuit 20 includes a first EGR cooler (first exhaust-gas cooling device) 21 at a high-temperature side and a second EGR cooler (second exhaust-gas cooling device) 22 at the same high-temperature side, which is provided downstream of the first EGR cooler 21 , and communicates with the intake-air pipes 14 through an EGR valve 23 .
  • the EGR circuit 20 By returning a part of the exhaust gas into the intake air through the EGR circuit 20 , it is possible to decrease oxygen concentration in combustion chambers of the engine 10 to decrease the combustion temperature, thereby suppressing generation of oxides, such as NOx etc. Because the efficiency increases with decrease in the temperature of the exhaust gas recirculated, in order to decrease the exhaust gas temperature, the first EGR cooler 21 at the high-temperature side and the second EGR cooler 22 at the same high-temperature side, which is provided downstream of the first EGR cooler 21 , are provided.
  • the cooling water respectively flows through the high-temperature side intercooler 71 and the low-temperature side intercooler 72 , and the temperature of the intake air supercharged by the turbine 18 is decreased. Because the temperature of the intake air may become high and the temperature difference with the cooling water is large, the temperature of the intake air is decreased at two stages, namely, the high-temperature side intercooler 71 and the low-temperature side intercooler 72 . The temperature of the intake air whose temperature has been decreased by the high-temperature side intercooler 71 is further decreased by the low-temperature side intercooler 72 .
  • the EGR valve 23 is provided downstream of the high-temperature side intercooler 71 and the low-temperature side intercooler 72 .
  • the EGR valve 23 controls the amount of the exhaust gas recirculated in the intake-air pipes 14 through the EGR circuit 20 .
  • the cooling water circuit 30 includes the high-temperature-side cooling water circuit (first cooling water circuit) 31 and the low-temperature-side cooling water circuit (second cooling water circuit) 32 .
  • the high-temperature-side cooling water circuit 31 is formed of a cooling water circuit that extends through, in addition to the cooling-water flow path 11 of the engine 10 , the radiator (first radiator) 41 , the first EGR cooler 21 at the high-temperature side, and the second EGR cooler 22 at the same high-temperature side, which is provided downstream of the first EGR cooler 21 .
  • the cooling water sent out from the water pump 12 of the engine 10 circulates through the cooling-water flow path 11 of the engine, passes through the radiator 41 , and returns to the cooling-water flow path of the engine 10 again.
  • a part of the cooling water sent out from the water pump 12 after coming out from the engine 10 , passes through the first EGR cooler 21 at the high-temperature side and the second EGR cooler 22 at the same high-temperature side, which is provided downstream of the first EGR cooler 21 , and returns to the cooling-water flow path 11 of the engine 10 again.
  • a part of the cooling water sent out from the water pump 12 comes out from the engine 10 , passes through a heat exchanger 76 and the high-temperature side intercooler 71 , and returns to the cooling-water flow path 11 of the engine 10 again.
  • the low-temperature-side cooling water circuit 32 is formed of a cooling water circuit passing through a thermostat 44 , the sub-radiator (second radiator) 42 , the low-temperature side intercooler 72 , and the heat exchanger 76 .
  • the cooling water sent out from the water pump of the engine 10 comes out from the engine 10 , passes through the thermostat 44 and the sub-radiator 42 , and is sent to the low-temperature side intercooler 72 . After coming out from the low-temperature side intercooler 72 , the cooling water returns to the cooling-water flow path 11 of the engine 10 again through the heat exchanger 76 .
  • the thermostat 44 makes the sub-radiator 42 to be bypassed, thereby preventing a further decrease in the cooling water temperature.
  • the low-temperature-side cooling water circuit 32 is formed such that, by passing through the sub-radiator 42 , the cooling water flowing therethrough has the temperature lower than that of the cooling water flowing through the high-temperature-side cooling water circuit 31 .
  • heat exchanger 76 heat exchange is performed between the cooling water that has come out from the engine 10 in the high-temperature-side cooling water circuit 31 and the cooling water that has come out from the low-temperature side intercooler 72 in the low-temperature-side cooling water circuit 32 .
  • the heat exchanger 76 has, for example, a double-pipe structure, and performs the heat exchange by being configured such that the cooling water in the high-temperature-side cooling water circuit 31 and the cooling water in the low-temperature-side cooling water circuit 32 flow in the opposite directions from each other.
  • the cooling device 1 is thus operated in a manner described below.
  • the cooling water is circulated through the cooling-water flow path 11 by the water pump 12 .
  • the thermostat 13 is switched such that the radiator 41 is bypassed.
  • the high-temperature-side cooling water circuit 31 is configured such that the temperature of the cooling water is prevented from being decreased by bringing the cooling water into contact with the high-temperature exhaust gas.
  • the high-temperature side intercooler 71 the decrease in the temperature of the cooling water is suppressed by bringing the cooling water into contact with the supercharged high-temperature intake air.
  • the temperature of the cooling water in the low-temperature-side cooling water circuit 32 is decreased via the heat exchange with the outside air performed in the sub-radiator 42 .
  • the cooling water whose temperature has been decreased undergoes the heat exchange with the supercharged intake air in the low-temperature side intercooler 72 , and thereby, the temperature of the intake air is decreased and the cooling water temperature is increased.
  • the temperature of the cooling water is further increased by undergoing heat exchange at the heat exchanger 76 with the cooling water in the high-temperature-side cooling water circuit 31 .
  • the cooling water whose temperature has been increased returns to the engine 10 again.
  • the temperature of the cooling water in the high-temperature-side cooling water circuit 31 is slightly decreased by undergoing the heat exchange at the heat exchanger 76 with the cooling water in the low-temperature-side cooling water circuit 32
  • the temperature of the cooling water in the high-temperature-side cooling water circuit 31 is increased by undergoing heat exchange at the high-temperature side intercooler 71 with the supercharged high-temperature intake air, and the cooling water returns to the engine 10 again.
  • the temperature of the supercharged intake air is decreased at the low-temperature side intercooler 72 with the cooling water whose cooling water temperature has been decreased at the sub-radiator 42 .
  • the cooling water whose temperature has been decreased passes through the low-temperature side intercooler 72 and the heat exchanger 76 to increase its temperature again, and the cooling water whose temperature has been increased returns to the engine 10 again.
  • the cooling water returns to the engine 10 through the circuit where the high-temperature-side cooling water circuit 31 and the low-temperature-side cooling water circuit 32 are joined.
  • the cooling water in the high-temperature-side cooling water circuit 31 and the cooling water in the low-temperature-side cooling water circuit 32 are mixed.
  • the first embodiment of the present invention is configured such that the cooling water that has come out from the engine 10 in the high-temperature-side cooling water circuit 31 and the cooling water that has come out from the low-temperature side intercooler 72 in the low-temperature-side cooling water circuit 32 undergo the heat exchange at the heat exchanger 76 .
  • the temperature of the cooling water is decreased at the sub-radiator 42 , it is possible to decrease the temperature of the supercharged intake air and to suppress generation of NOx while improving the operation efficiency of the engine.
  • the delay in the warming up of the engine 10 is improved. Because the temperature of the cooling water flowing through the high-temperature side intercooler 71 in the high-temperature-side cooling water circuit 31 is decreased by passing through the heat exchanger 76 , it is possible to decrease the temperature of the intake air at the high-temperature side intercooler 71 .
  • the cooling water that has come out from the high-temperature side intercooler 71 is combined with the cooling water flowing just before the engine 10 in the low-temperature-side cooling water circuit 32 , and the combined cooling water then flows into the engine 10 , the temperature of the cooling water flowing through the engine 10 is increased, thereby improving the delay in the warming up of the engine 10 .
  • FIG. 2 is an explanatory diagram of the cooling device 1 according to the second embodiment of the present invention showing the engine 10 at the center thereof. Components that are the same as those in the first embodiment are assigned the same reference signs, and a description thereof shall be omitted.
  • a valve 85 is provided at the inlet side of the heat exchanger 76 , and a bypass channel 86 bypassing the heat exchanger 76 is provided. By opening/closing the valve 85 , the flow of the cooling water flowing through the heat exchanger 76 in the low-temperature-side cooling water circuit 32 is controlled.
  • the cooling device 1 includes a first water temperature gauge 81 that detects the water temperature of the cooling water flowing into the heat exchanger 76 from the high-temperature-side cooling water circuit 31 and a second water temperature gauge 82 that detects the water temperature of the cooling water flowing into the heat exchanger 76 from the low-temperature-side cooling water circuit 32 .
  • a controller 60 is provided so as to perform opening/closing control of the valve 85 on the basis of a water temperature TwH in the high-temperature-side cooling water circuit 31 detected by the first water temperature gauge 81 and a water temperature TwL in the low-temperature-side cooling water circuit 32 detected by the second water temperature gauge 82 .
  • FIG. 3 is a flowchart of a control of a cooling water circuit executed by the controller 60 according to the second embodiment of the present invention.
  • the flowchart shown in FIG. 3 is executed by the controller 60 when the engine 10 is started.
  • the controller 60 checks whether the cooling water temperature has reached a valve opening temperature of the thermostat 44 in the low-temperature-side cooling water circuit 32 (Step S 10 ).
  • the cooling water temperature has not reached the valve opening temperature of the thermostat 44 , because it is determined that the cooling water temperature is low, it is possible to determine malfunction of the first water temperature gauge 81 and the second water temperature gauge 82 . It may be possible to check whether the thermostat 44 is opened, instead of checking the cooling water temperature.
  • the controller 60 detects the water temperature TwH at the inlet side of the heat exchanger 76 in the high-temperature-side cooling water circuit 31 through the first water temperature gauge 81 .
  • the controller 60 detects the water temperature TwL at the outlet side of the heat exchanger 76 in the low-temperature-side cooling water circuit 32 through the second water temperature gauge 82 .
  • the controller 60 determines if the water temperature TwL is lower than the water temperature TwH (Step S 20 ).
  • Step S 30 When the water temperature TwL is determined to be lower than the water temperature TwH, the process advances to Step S 30 , and the controller 60 performs a control so as to open the valve 85 .
  • the controller 60 performs a control so as to open the valve 85 .
  • the cooling water in the low-temperature-side cooling water circuit 32 is made to pass through the heat exchanger 76 , and thereby, at the heat exchanger 76 , the cooling water in the low-temperature-side cooling water circuit 32 and the cooling water in the high-temperature-side cooling water circuit 31 undergo the heat exchange. Thereafter, the process advances to Step S 40 .
  • Step S 40 the controller 60 determines whether the water temperature TwL is higher than the water temperature TwH. When the water temperature TwL is lower than the water temperature TwH, the controller 60 repeats Step S 40 and waits. In this case, the valve 85 is left open, and at the heat exchanger 76 , the cooling water in the low-temperature-side cooling water circuit 32 and the cooling water in the high-temperature-side cooling water circuit 31 undergo the heat exchange.
  • Step S 50 the controller 60 performs the control so as to close the valve 85 .
  • the cooling water in the low-temperature-side cooling water circuit 32 passes through the bypass channel 86 without passing through the heat exchanger 76 , and does not undergo the heat exchange with the cooling water flowing through the heat exchanger 76 in the high-temperature-side cooling water circuit 31 . Thereafter, the process advances to Step S 60 .
  • Step S 20 when the water temperature TwL is determined to be equal to or higher than the water temperature TwH, the processes of Steps S 30 and S 40 are not performed, in other words, the process advances to Step S 50 without opening the valve 85 , and the controller 60 performs the control so as to close the valve 85 .
  • Step S 60 the controller 60 determines whether the operation of the engine 10 is stopped. If the engine 10 is under operation, the process returns to Step S 20 , and the processes are repeated. If the operation of the engine 10 is stopped, the process shown in this flowchart is terminated.
  • the controller 60 determines whether the valve 85 is to be opened to perform the heat exchange at the heat exchanger 76 , on the basis of the water temperature TwL in the low-temperature-side cooling water circuit 32 and the water temperature TwH in the high-temperature-side cooling water circuit 31 .
  • the heat exchange is not performed at the heat exchanger 76 .
  • the temperature of the cooling water flowing into the engine 10 is not decreased, and the delay in the warming up of the engine is improved. Because the heat exchange is not performed with the cooling water in the high-temperature-side cooling water circuit 31 whose cooling water temperature is a high temperature, it is possible to further decrease the temperature of the supercharged intake air at the high-temperature side intercooler 71 .
  • FIG. 4 is an explanatory diagram of the cooling device 1 according to the third embodiment of the present invention showing the engine 10 at the center thereof.
  • Components that are the same as those in the first and second embodiments are assigned the same reference signs, and a description thereof shall be omitted.
  • a low-temperature-side third EGR cooler 24 is provided instead of the high-temperature-side second EGR cooler 22 in the first or second embodiment, and the cooling device 1 is configured such that the cooling water in the low-temperature-side cooling water circuit 32 flows into the low-temperature-side third EGR cooler 24 .
  • the cooling device 1 includes a second heat exchanger 46 that performs the heat exchange between the cooling water in the high-temperature-side cooling water circuit 31 that flows into the high-temperature-side first EGR cooler 21 provided in the EGR circuit 20 and the cooling water that has come out from the low-temperature-side third EGR cooler 24 in the low-temperature-side cooling water circuit 32 .
  • the efficiency increases with decrease in the temperature of the intake air of the engine 10 , in order to decrease the temperature of the exhaust gas to be recirculated by EGR, it is configured such that the low-temperature cooling water that has come out from the sub-radiator 42 flows into the low-temperature-side third EGR cooler 24 .
  • the high-temperature-side cooling water circuit 31 a part of the cooling water sent out from the water pump 12 of the engine 10 comes out from the engine 10 , passes through the second heat exchanger 46 and the high-temperature-side first EGR cooler 21 , and returns to the cooling-water flow path 11 of the engine 10 again.
  • the low-temperature-side cooling water circuit 32 a part of the cooling water that has come out from the sub-radiator 42 is sent to the low-temperature-side third EGR cooler 24 .
  • the cooling water that has come out from the low-temperature-side third EGR cooler 24 passes through the second heat exchanger 46 and returns to the cooling-water flow path 11 of the engine 10 again.
  • the second heat exchanger 46 the heat exchange is performed between the cooling water that has come out from the engine 10 in the high-temperature-side cooling water circuit 31 and the cooling water that has come out from the low-temperature-side third EGR cooler 24 in the low-temperature-side cooling water circuit 32 .
  • the second heat exchanger 46 has, for example, a double-pipe structure, and performs the heat exchange by being configured such that the cooling water in the high-temperature-side cooling water circuit 31 and the cooling water in the low-temperature-side cooling water circuit 32 flow in the opposite directions from each other.
  • the low-temperature-side third EGR cooler 24 is configured such that the exhaust gas temperature is decreased with the cooling water whose cooling water temperature has been decreased in the sub-radiator 42 .
  • the high-temperature-side cooling water circuit 31 is configured such that the temperature of the cooling water is prevented from being decreased by bringing the cooling water into contact with the high-temperature exhaust gas, even when the engine 10 is cold-started, delay in the warming up of the engine 10 is improved by the flow of the cooling water at relatively high temperature.
  • the cooling water whose temperature has been decreased by the sub-radiator 42 passes through the low-temperature-side third EGR cooler 24 and the second heat exchanger 46 , and returns to the cooling-water flow path 11 .
  • the exhaust gas temperature is decreased and the cooling water temperature is increased.
  • the cooling water that has come out from the low-temperature-side third EGR cooler 24 undergoes the heat exchange at the second heat exchanger 46 with the cooling water in the high-temperature-side cooling water circuit 31 , causing its temperature to be further increased.
  • the cooling water whose temperature has been increased returns to the engine 10 again.
  • the cooling water in the high-temperature-side cooling water circuit 31 and the cooling water in the low-temperature-side cooling water circuit 32 are combined at a point just upstream of the engine 10 , and the combined cooling water returns to the engine 10 .
  • the temperature of the cooling water returning to the engine 10 is not decreased, and therefore, the delay in the warming up of the engine 10 is improved.
  • the controller 60 may determine whether the second heat exchanger 46 is to be bypassed on the basis of the water temperature in the low-temperature-side cooling water circuit 32 and the water temperature in the high-temperature-side cooling water circuit 31 .
  • a valve 65 is provided at the inlet side of the second heat exchanger 46 , and a bypass channel 66 that bypasses the second heat exchanger 46 is provided. By opening/closing the valve 65 , the flow of the cooling water flowing through the second heat exchanger 46 in the low-temperature-side cooling water circuit 32 is controlled.
  • the cooling device 1 includes a third water temperature gauge 61 that detects the water temperature of the cooling water flowing into the second heat exchanger 46 from the high-temperature-side cooling water circuit 31 and a fourth water temperature gauge 62 that detects the water temperature of the cooling water flowing into the second heat exchanger 46 from the low-temperature-side cooling water circuit 32 .
  • the controller 60 performs opening/closing control of the valve 65 on the basis of a water temperature TwH 3 in the high-temperature-side cooling water circuit 31 detected by the third water temperature gauge 61 and a water temperature TwL 4 in the low-temperature-side cooling water circuit 32 detected by the fourth water temperature gauge 62 .
  • the valve 65 is switched such that the heat exchange is performed at the second heat exchanger 46 .
  • the temperature of the cooling water flowing into the engine 10 is not decreased, and therefore, the delay in the warming up of the engine is improved.
  • the exhaust gas temperature can be further decreased in the high-temperature-side first EGR cooler 21 .
  • the valve 65 is switched such that the heat exchange is not performed at the second heat exchanger 46 .
  • the heat exchange is not performed with the cooling water whose temperature is lower than that of the cooling water in the low-temperature-side cooling water circuit 32 , the temperature of the cooling water flowing into the engine 10 is not decreased, and therefore, the delay in the warming up of the engine is improved. Because the heat exchange is not performed with the cooling water temperature in the high-temperature-side cooling water circuit 31 whose temperature is higher than the cooling water, it is possible to cool the exhaust gas further more in the high-temperature-side first EGR cooler 21 .
  • the third embodiment after the temperature of the supercharged intake air is decreased as with the first and second embodiments, and in addition, after the exhaust gas temperature is decreased at the high-temperature-side first EGR cooler 21 , it is possible to decrease the exhaust gas temperature at the low-temperature-side third EGR cooler 24 with the cooling water in the low-temperature-side cooling water circuit 32 . Even with such a configuration, because it is possible to prevent decrease in the temperature of the cooling water that circulates through the high-temperature-side cooling water circuit 31 and the low-temperature-side cooling water circuit 32 and returns to the engine 10 , it is possible to improve the delay in the warming up of the engine 10 even when the engine 10 is cold-started.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Supercharger (AREA)
US14/770,719 2013-02-27 2014-02-12 Intake-air cooling device for engine and method for cooling engine Abandoned US20160003127A1 (en)

Applications Claiming Priority (3)

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JP2013036644A JP5993759B2 (ja) 2013-02-27 2013-02-27 エンジンの吸気冷却装置
JP2013-036644 2013-02-27
PCT/JP2014/053230 WO2014132798A1 (ja) 2013-02-27 2014-02-12 エンジンの吸気冷却装置及び冷却方法

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JP (1) JP5993759B2 (de)
CN (1) CN105143633A (de)
DE (1) DE112014001021T8 (de)
WO (1) WO2014132798A1 (de)

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US20160115915A1 (en) * 2014-10-22 2016-04-28 Hyundai Motor Company Cooling system provided with intercooler and control method thereof
US20160169080A1 (en) * 2014-12-15 2016-06-16 Hyundai Motor Company Vehicle exhaust heat recovery system and method
US20180179946A1 (en) * 2016-12-26 2018-06-28 Toyota Jidosha Kabushiki Kaisha Engine system
US20190136746A1 (en) * 2017-11-06 2019-05-09 GM Global Technology Operations LLC Methods for controlling turbocharger compressor air cooling systems
US10914225B1 (en) 2019-10-25 2021-02-09 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US10920653B1 (en) 2019-10-25 2021-02-16 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US10934924B1 (en) 2019-10-25 2021-03-02 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US11022024B2 (en) * 2019-10-25 2021-06-01 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US11028764B2 (en) 2019-10-25 2021-06-08 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US20230265778A1 (en) * 2020-07-01 2023-08-24 Nippon Thermostat Co., Ltd. Cooling system

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JP6064981B2 (ja) * 2014-12-12 2017-01-25 トヨタ自動車株式会社 内燃機関の制御装置
CN105370376A (zh) * 2015-12-24 2016-03-02 玉柴联合动力股份有限公司 一种工程机械用柴油机冷却系统及其控制方法
CN108431381B (zh) * 2015-12-30 2020-06-09 瓦锡兰芬兰有限公司 增压空气冷却器的清洁方法和内燃发动机
CN105736125A (zh) * 2016-03-17 2016-07-06 潍柴动力股份有限公司 一种发动机进气温度控制系统及控制方法
JP7139592B2 (ja) * 2017-10-06 2022-09-21 いすゞ自動車株式会社 冷却システム
FR3086976B1 (fr) * 2018-10-09 2020-09-25 Renault Sas Systeme de refroidissement pour moteur a combustion interne et procede de pilotage associe

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
US20160115915A1 (en) * 2014-10-22 2016-04-28 Hyundai Motor Company Cooling system provided with intercooler and control method thereof
US9957926B2 (en) * 2014-10-22 2018-05-01 Hyundai Motor Company Cooling system provided with intercooler and control method thereof
US20160169080A1 (en) * 2014-12-15 2016-06-16 Hyundai Motor Company Vehicle exhaust heat recovery system and method
US9790841B2 (en) * 2014-12-15 2017-10-17 Hyundai Motor Company Vehicle exhaust heat recovery system and method
US10655529B2 (en) * 2016-12-26 2020-05-19 Toyota Jidosha Kabushiki Kaisha Engine system
US20180179946A1 (en) * 2016-12-26 2018-06-28 Toyota Jidosha Kabushiki Kaisha Engine system
US20190136746A1 (en) * 2017-11-06 2019-05-09 GM Global Technology Operations LLC Methods for controlling turbocharger compressor air cooling systems
US10914225B1 (en) 2019-10-25 2021-02-09 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US10920653B1 (en) 2019-10-25 2021-02-16 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US10934924B1 (en) 2019-10-25 2021-03-02 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US11022024B2 (en) * 2019-10-25 2021-06-01 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US11028764B2 (en) 2019-10-25 2021-06-08 Hyundai Motor Company Vehicle thermal management system applying an integrated thermal management valve and a cooling circuit control method thereof
US20230265778A1 (en) * 2020-07-01 2023-08-24 Nippon Thermostat Co., Ltd. Cooling system
US11795861B2 (en) * 2020-07-01 2023-10-24 Nippon Thermostat Co., Ltd. Cooling system

Also Published As

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WO2014132798A1 (ja) 2014-09-04
DE112014001021T5 (de) 2015-12-03
JP2014163336A (ja) 2014-09-08
CN105143633A (zh) 2015-12-09
DE112014001021T8 (de) 2015-12-31
JP5993759B2 (ja) 2016-09-14

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