WO2015163227A1 - Hybrid system, hybrid system vehicle, and egr method for hybrid system - Google Patents

Hybrid system, hybrid system vehicle, and egr method for hybrid system Download PDF

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Publication number
WO2015163227A1
WO2015163227A1 PCT/JP2015/061704 JP2015061704W WO2015163227A1 WO 2015163227 A1 WO2015163227 A1 WO 2015163227A1 JP 2015061704 W JP2015061704 W JP 2015061704W WO 2015163227 A1 WO2015163227 A1 WO 2015163227A1
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low
pressure egr
cooling water
pressure
passage
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PCT/JP2015/061704
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French (fr)
Japanese (ja)
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将司 早崎
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いすゞ自動車株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/24—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/30—Conjoint control of vehicle sub-units of different type or different function including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D23/00—Controlling engines characterised by their being supercharged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • 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
    • 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
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention can reduce the amount of NOx contained in the exhaust gas of an internal combustion engine more efficiently, and can improve the durability of the compressor of the supercharging system, the hybrid vehicle, and the hybrid system This relates to the EGR method.
  • the exhaust turbine of the exhaust passage is rotated using the exhaust energy of the engine, and the intake passage of the intake passage connected to the exhaust turbine by this rotational force is used.
  • a supercharging system that operates a compressor to compress intake air and increase the intake air amount into each cylinder of the engine.
  • a multi-stage supercharging system including a plurality of supercharging systems has been put into practical use, and in particular, a two-stage supercharging system including a low-pressure supercharging system and a high-pressure supercharging system is used. .
  • a part of the exhaust gas is recirculated to the intake passage to reduce the oxygen concentration of the intake air, thereby reducing the oxygen concentration in the engine (inside the cylinder).
  • An EGR system that suppresses the combustion temperature and reduces the amount of NOx generated is also provided.
  • the low pressure EGR gas is supercharged by the compressor of the supercharging system and enters the cylinder.
  • the temperature entering the low pressure EGR cooler is higher than the atmospheric temperature (for example, 100 If the mixed gas mixed with the low-pressure EGR gas and the intake air is compressed for supercharging by the compressor, the temperature rises and the high-temperature air-fuel mixture passes through the compressor. For this reason, there is a problem that the amount of EGR is reduced and NOx cannot be sufficiently reduced, and the heat load of the compressor is increased and its durability is lowered.
  • a low pressure EGR cooler is provided in the low pressure EGR passage connecting the exhaust passage and the intake passage, and the low pressure EGR gas is cooled before being supplied to the intake passage.
  • a low-pressure EGR passage that recirculates a part of the exhaust downstream of the turbine of the turbocharger as low-pressure EGR gas to the intake passage upstream of the compressor of the turbocharger;
  • a means for adjusting the flow rate of the low-pressure EGR gas a low-pressure EGR cooler for exchanging heat between the low-pressure EGR gas and the cooling water for the engine, a means for adjusting the flow rate of the cooling water flowing through the low-pressure EGR cooler, and an exhaust passage
  • the internal combustion engine is cold started, the temperature of the exhaust purification catalyst is increased, and the exhaust purification catalyst is at or above the activation temperature.
  • a control device for an internal combustion engine that increases the flow rate of the low-pressure EGR gas and increases the flow rate of the cooling water flowing through the low-pressure EGR cooler. It is.
  • the present inventors need to cool electric equipment such as a motor generator, an inverter, and a battery in a hybrid vehicle equipped with a hybrid system including an internal combustion engine and a motor generator.
  • This cooling water passage is provided with an independent cooling water passage for the motor generator.
  • the temperature of the cooling water for the motor generator used for cooling the electric equipment is about 50 ° C., which is lower than the temperature of about 80 ° C. for the cooling water for the engine.
  • the cooling water for the low-pressure EGR cooler is used by using the cooling water for the electric equipment instead of the cooling water for the engine of the prior art as the cooling medium for the low-pressure EGR cooler. It was found that the performance can be improved and the cooling efficiency of the low-pressure EGR gas can be improved.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a hybrid system, a hybrid vehicle, and an EGR method for a hybrid system in which an internal combustion engine of the hybrid system is provided with a supercharging system and a low pressure EGR system.
  • a hybrid system, a hybrid vehicle, and an EGR method for a hybrid system that can secure a sufficient EGR amount, reduce the amount of NOx generated in a cylinder, and reduce the heat load of a compressor to improve durability. That is.
  • a hybrid system is a hybrid system including a motor generator, an internal combustion engine having a supercharging system and a low pressure EGR system, and an exhaust passage downstream of a turbine of the supercharging system.
  • a low pressure EGR cooler is provided in a low pressure EGR passage connecting an intake passage upstream of the compressor of the supercharging system, and the low pressure EGR cooler cools the low pressure EGR gas with cooling water for cooling the motor generator.
  • cooling for a motor generator having a low temperature of about 50 ° C. is used for cooling water for a relatively high temperature of about 80 ° C., which is used as cooling water in a low pressure EGR cooler in the prior art.
  • water as the cooling medium for the low-pressure EGR cooler
  • the cooling efficiency and cooling performance of the low-pressure EGR cooler can be improved, so the volume of the low-pressure EGR gas can be reduced and the amount of low-pressure EGR gas recirculated to the intake passage can be increased.
  • the amount of NOx generated in the cylinder can be reduced, the temperature of the low-pressure EGR gas can be lowered, the thermal load on the downstream compressor can be reduced, and the durability can be improved.
  • the low pressure EGR passage when configured to branch from an exhaust passage downstream of the exhaust gas purification device disposed in the exhaust passage, the low pressure EGR gas is unburned carbonized in the exhaust gas. Since hydrogen (HC, black smoke), etc. is removed by the exhaust gas purification device, it is returned to the intake passage via the low-pressure EGR cooler, so that unburned hydrocarbons accumulate on the low-pressure EGR cooler, compressor, and intake passage The amount can be reduced and the performance of these devices can be maintained in good condition.
  • a cooling water amount adjusting device for adjusting a flow rate of cooling water supplied to the low pressure EGR cooler, an exhaust gas temperature detecting device for detecting a temperature of the low pressure EGR gas flowing into the low pressure EGR cooler,
  • a control device for controlling the cooling water amount adjusting device is provided, and when the low pressure EGR is stopped, or when the detected temperature of the exhaust gas temperature detecting device is equal to or lower than a preset first set temperature.
  • the flow rate of the cooling water flowing into the low pressure EGR cooler is set to a preset minimum flow rate, and when the detected temperature exceeds the first set temperature, the flow rate of the cooling water flowing into the low pressure EGR cooler is
  • the cooling water amount adjusting device is configured to control the preset amount to change in accordance with the detected temperature, it is as follows. It is possible to achieve the effect.
  • the cooling amount of the low-pressure EGR cooler can be optimized according to the operating state of the engine by changing the flow rate of the cooling water to the low-pressure EGR cooler according to the temperature of the exhaust gas.
  • hybrid vehicle of this invention for achieving said objective is comprised including said hybrid system, and there can exist an effect similar to said hybrid system.
  • an EGR method for a hybrid system is an EGR method for a hybrid system including a motor generator and an internal combustion engine having a supercharging system and a low-pressure EGR system.
  • the low pressure EGR cooler provided in the low pressure EGR passage connecting the exhaust passage downstream of the turbine and the intake passage upstream of the compressor of the supercharging system, and the low pressure EGR gas is cooled with cooling water for cooling the motor generator. It is a method characterized by cooling. According to this method, the same effects as those of the hybrid system and the hybrid vehicle can be obtained.
  • electric power having a relatively low temperature of about 50 ° C. is used without using coolant for a relatively high temperature engine of about 80 ° C.
  • the cooling water for the generator as a cooling medium for the low-pressure EGR cooler, the cooling efficiency and cooling performance of the low-pressure EGR gas can be improved, so that the volume of the low-pressure EGR gas can be reduced and the low-pressure EGR gas is returned to the intake passage
  • the amount of NOx generated in the cylinder can be reduced by increasing the amount of EGR gas, and the temperature of the low-pressure EGR gas can be reduced to reduce the thermal load of the compressor and improve the durability.
  • FIG. 1 is a diagram illustrating an example of a configuration of a hybrid system according to an embodiment of the present invention.
  • a hybrid system 1 is configured to include an engine (internal combustion engine) 10 and a motor generator 30, and a hybrid vehicle (not shown) according to an embodiment of the present invention. ) Is a vehicle that travels by transmitting the power of the engine 10 of the hybrid system 1 and the power of the motor generator 30 to wheels (not shown).
  • the engine 10 also includes an engine body 11, an intake passage 12, an exhaust passage 13, a high pressure EGR passage 14, and a low pressure EGR passage 15.
  • the air cleaner 16, the low-pressure stage compressor 17 b of the low-pressure stage turbocharger 17 of the low-pressure stage turbocharging system 4, the inter-turbo cooling device 18, and the high-pressure stage turbocharger of the high-pressure stage supercharging system 3 are arranged in this order from the upstream side.
  • 19 high-pressure compressors 19b, an intercooler 20, an intake throttle valve 21 and the like are provided.
  • the high-pressure turbine 19a of the high-pressure turbocharger 19 of the high-pressure turbocharging system 3 the low-pressure turbine 17a of the low-pressure turbocharger 17 of the low-pressure turbocharging system 4, and the exhaust A gas purification device 22, an exhaust throttle valve 23, and the like are provided.
  • the high-pressure stage supercharging system 3 is a supercharging system including a high-pressure stage turbocharger 19 including a high-pressure stage turbine 19a and a high-pressure stage compressor 19b.
  • the high-pressure stage supercharging system 3 uses the energy of the exhaust gas Ga of the engine body 11 to In this system, the turbine 19a is rotated, and a high-pressure compressor 19b connected to the high-pressure turbine 19a is operated by this rotational force to compress the intake air A + Gel and increase the intake air amount into each cylinder of the engine body 11.
  • the low-pressure stage supercharging system 4 is a supercharging system including a low-pressure stage turbocharger 17 including a low-pressure stage turbine 17a and a low-pressure stage compressor 17b, and uses the energy of the exhaust gas Ga of the engine body 11.
  • This system rotates the low-pressure stage turbine 17a and operates the low-pressure stage compressor 17b connected to the low-pressure stage turbine 17a with this rotational force to compress the intake air A + Gel, thereby increasing the intake air amount into each cylinder of the engine body 11. .
  • a bypass passage 19c is provided, and a high-pressure turbine open / close valve 19e is provided in the high-pressure turbine bypass passage 19c.
  • a high-pressure compressor bypass passage 19d that branches from the intake passage 12 upstream of the high-pressure compressor 19b and joins the intake passage 12 downstream of the high-pressure compressor 19b is provided, and this high-pressure compressor bypass passage 19d. Is provided with an open / close valve 19f for a high-pressure compressor.
  • both the high-pressure stage supercharging system 3 and the low-pressure stage supercharging system 4 are supercharged with intake air A + Gel
  • both the open / close valves 19e and 19f are closed and the exhaust gas is exhausted.
  • the intake air A + Gel is supercharged by the high pressure stage supercharging system 3 so that Ga and the intake air A + Gel pass through the high pressure stage turbine 19a and the high pressure stage compressor 19b.
  • the on-off valve 19e is opened so that the exhaust gas Ga passes through the bypass passage 19c.
  • the high pressure stage supercharging system 3 prevents the supercharging of the intake air A + Gel and opens the on-off valve 19f so that the intake air A + Gel passes through the bypass passage 19d. Do not become the resistance of intake A + Gel.
  • the high pressure EGR system 5 is an EGR system including a high pressure EGR passage 14, a high pressure EGR cooler 24, and a high pressure EGR valve 25.
  • the high pressure EGR passage 14 is connected to the exhaust passage 13 upstream of the high pressure stage turbine 19a.
  • a high-pressure EGR cooler 24 and a high-pressure EGR valve 25 are provided in order from the upstream side. This high pressure EGR valve 25 adjusts the flow rate of the high pressure EGR gas Geh recirculating to the intake passage 12.
  • a part of the high-temperature exhaust gas G passing through the exhaust passage 13 upstream of the high-pressure turbine 19 a is cooled by the high-pressure EGR cooler 24 of the high-pressure EGR passage 14 as the high-pressure EGR gas Geh and then returned to the intake passage 12. Then, by reducing the oxygen concentration of the intake air, the combustion temperature in the cylinder is suppressed, and the amount of NOx generated is reduced.
  • the low pressure EGR system 6 is an EGR system including a low pressure EGR passage 15, a low pressure EGR cooler 26, and a low pressure EGR valve 27.
  • the low pressure EGR passage 15 is an exhaust passage 13 downstream of the low pressure turbine 17a.
  • a low-pressure EGR cooler 26 and a low-pressure EGR valve 27 are provided in this order from the upstream side.
  • This low pressure EGR valve 27 adjusts the flow rate of the low pressure EGR gas Gel recirculating to the intake passage 12.
  • a part of the low-temperature exhaust gas Ga passing through the exhaust passage 13 on the downstream side of the low-pressure turbine 17a is cooled as the low-pressure EGR gas Gel by the low-pressure EGR cooler 26 of the low-pressure EGR passage 15, and then returned to the intake passage 12.
  • an exhaust gas temperature sensor (exhaust gas temperature detection device) 33 is provided in the exhaust passage 13 downstream from the low-pressure turbine 17 a and upstream from the connection point with the low-pressure EGR passage 15. As shown in FIG. 1, the exhaust gas temperature sensor 33 may be provided on the upstream side of the exhaust gas purification device 22, or may be provided on the downstream side of the exhaust gas purification device 22.
  • the intake air A + Gel is converted into the low pressure stage.
  • the compressor 17 b, the inter-turbo cooling device 18, the high-pressure compressor 19 b, the intercooler 20, the intake throttle valve 21, and the intake air A + Gel are further supplied from the high-pressure EGR passage 14 via the high-pressure EGR cooler 24 and the high-pressure EGR valve 25.
  • the intake air A + Gel + Geh is mixed and compressed with fuel injected from a fuel injection device (not shown), and the fuel is ignited and burned.
  • Gc-Gel the remaining exhaust gas Gb
  • the low pressure EGR cooler 26 is configured to cool the low pressure EGR gas Gel with the cooling water that cools the motor generator 30. That is, the cooling water Wb which is a part of the cooling water W is branched from the branch point P1 downstream of the motor generator 30 in the cooling water circulation passage 31 through which the cooling water W for cooling the motor generator 30 circulates, and the low-pressure EGR cooler. 26, a bypass passage 32 that joins the joining point P2 of the cooling water circulation passage 31 is provided. Further, a flow rate adjusting valve (cooling water amount adjusting device) 34 is provided at the branch point P1 so that the flow rate of the cooling water Wb flowing through the bypass passage 32 can be adjusted.
  • the cooling water for the relatively high temperature engine of about 80 ° C. used as the cooling water in the low pressure EGR cooler 26 in the prior art
  • an exhaust gas purification device 22 is arranged in the exhaust passage 13 downstream from the low-pressure turbine 17a and upstream from the connection point with the low-pressure EGR passage 15. That is, the low-pressure EGR passage 15 is configured to be branched from the exhaust passage 13 on the downstream side of the exhaust gas purification device 22 arranged in the exhaust passage 13.
  • the exhaust gas purification device 22 removes components to be purified such as nitrogen oxide (NOx), unburned hydrocarbon (HC), carbon monoxide (CO), and particulate matter (PM) contained in the exhaust gas Ga. It is an apparatus, and is composed of an oxidation catalyst device (DOC), a particulate collection device (DPD), a selective catalytic reduction device (SCR), and the like.
  • DOC oxidation catalyst device
  • DPD particulate collection device
  • SCR selective catalytic reduction device
  • the low-pressure EGR gas Gel that is a part of the exhaust gas Ga passes through the low-pressure EGR cooler 26. Since the refrigerant is recirculated to the intake passage 12, the low pressure EGR cooler 26, the low pressure stage compressor 17b, the high pressure stage compressor 19b, and the unburned hydrocarbons on the intake passage 12 can be prevented from adhering and accumulating. The performance can be maintained in a good state.
  • control device 41 for controlling the flow rate adjusting valve 34 is provided.
  • the control device 41 may be incorporated in the overall system control device 40 that performs overall control of the hybrid system 1 based on information from various sensors such as an accelerator opening sensor (not shown), or may be provided independently. Good.
  • the control device 41 inputs a detection value of an exhaust gas temperature sensor (exhaust gas temperature detection device) 33 for detecting the temperature of the low pressure EGR gas Gel flowing into the low pressure EGR cooler 26 and supplies the detected value to the low pressure EGR cooler 26.
  • the flow rate adjusting valve (cooling water amount adjusting device) 34 for adjusting the flow rate Vw of the cooling water Wb to be controlled is controlled.
  • the first set temperature T1 (for example, a temperature within a range of 50 ° C. to 200 ° C.).
  • the flow rate Vw of the cooling water Wb flowing into the low pressure EGR cooler 26 is set to the preset minimum flow rate Vmin, and when the detected temperature Tm exceeds the first set temperature T1, the low pressure EGR cooler 26
  • the flow rate adjustment valve 34 is configured to control the flow rate Vw of the flowing cooling water Wb to a preset set amount V (Tm) that changes according to the detected temperature Tm.
  • the first set temperature T1 and the minimum flow rate Vmin are set in advance by experiments or the like and stored in the control device 41, or can be calculated by the control device 41.
  • the temperature T of the low-pressure EGR gas Gel flowing into the low-pressure EGR cooler 26 is equal to or lower than the first set temperature T1 when the engine 10 is started or in a low load state, the amount of heat of the low-pressure EGR gas Gel is small. Then, the flow rate Vw of the cooling water Wb is set to the minimum flow rate Vmin, and the power consumption of the circulation drive pump (not shown) is suppressed to save energy.
  • the cooling water Wb having the minimum flow rate Vmin is allowed to flow in consideration of the timing of starting cooling when cooling is restarted. Allow cooling.
  • the flow rate Vw of the cooling water Wb is changed, for example, by increasing the flow rate Vw of the cooling water Wb.
  • the power consumption of the driving pump for circulating the cooling water W can be optimized according to the operating state of the engine 10, and energy saving can be achieved.
  • the EGR method of the hybrid system of embodiment which concerns on this invention was provided with the engine 10 which has the motor generator 30, the supercharging system (here two-stage supercharging system) 3, 4 and the low voltage
  • a relatively low temperature of about 50 ° C. is used without using coolant for a relatively high temperature engine of about 80 ° C.
  • the cooling water W (Wb) for the motor generator as a cooling medium for the low pressure EGR cooler 26
  • the cooling efficiency and cooling performance of the low pressure EGR gas Gl can be improved, so the volume of the low pressure EGR gas Gel is reduced.
  • the amount of low-pressure EGR gas that can be reduced and recirculated to the intake passage 12 can be increased to reduce the amount of NOx generated in the cylinder, and the temperature of the low-pressure EGR gas Gel can be reduced to reduce the pressure of the low-pressure stage compressor 17b.
  • Durability can be improved by reducing the thermal load on the stage compressor 19b.

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  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
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Abstract

In a low-pressure exhaust gas recirculation (EGR) channel (15) that connects an exhaust channel (13) downstream from a turbine (17a) of supercharging systems (3, 4) and an intake channel (12) upstream from a compressor (17b) of the supercharging systems (3, 4), a low-pressure EGR cooler (26) is provided and is configured such that low-pressure EGR gas (Gel) is cooled by cooling water (W) that cools an electrical generator (30). Due to this configuration, provided is a hybrid system or the like, the system comprising the electrical generator and an internal combustion engine which has supercharging systems and a low-pressure EGR system, wherein the quantity of NOx produced in cylinders is reduced by maintaining a sufficient EGR quantity and durability is increased by reducing the thermal load of a compressor of the supercharging systems.

Description

ハイブリッドシステム、ハイブリッドシステム車両、及び、ハイブリッドシステムのＥＧＲ方法HYBRID SYSTEM, HYBRID SYSTEM VEHICLE, AND EGR METHOD FOR HYBRID SYSTEM
　本発明は、内燃機関の排気ガスに含有されるＮＯｘ量をより効率よく低減することができるとともに、過給システムのコンプレッサの耐久性を向上させることができるハイブリッドシステム、ハイブリッド車両、及び、ハイブリッドシステムのＥＧＲ方法に関する。 The present invention can reduce the amount of NOx contained in the exhaust gas of an internal combustion engine more efficiently, and can improve the durability of the compressor of the supercharging system, the hybrid vehicle, and the hybrid system This relates to the EGR method.
　一般に、ディーゼルエンジンを搭載した車両では、エンジンの燃焼効率を向上させるために、エンジンの排気エネルギーを利用して排気通路の排気タービンを回転させ、この回転力で排気タービンに接続する吸気通路の吸気コンプレッサを稼動させて吸気を圧縮し、エンジンの各気筒内への吸気量を増量させる過給システムが備えられている。また、近年では、この過給システムを複数備えた多段過給システムも実用化されており、特に、低圧段過給システムと高圧段過給システムを備えた２段過給システムが使用されている。 Generally, in a vehicle equipped with a diesel engine, in order to improve the combustion efficiency of the engine, the exhaust turbine of the exhaust passage is rotated using the exhaust energy of the engine, and the intake passage of the intake passage connected to the exhaust turbine by this rotational force is used. There is a supercharging system that operates a compressor to compress intake air and increase the intake air amount into each cylinder of the engine. In recent years, a multi-stage supercharging system including a plurality of supercharging systems has been put into practical use, and in particular, a two-stage supercharging system including a low-pressure supercharging system and a high-pressure supercharging system is used. .
　また、エンジンより排出される排気ガス中のＮＯｘ量を低減するために、排気ガスの一部を吸気通路に還流して吸気の酸素濃度を低下させることで、エンジンの気筒内（シリンダ内）の燃焼温度を抑制し、ＮＯｘ発生量を低減させるＥＧＲシステムも備えられている。 Further, in order to reduce the amount of NOx in the exhaust gas exhausted from the engine, a part of the exhaust gas is recirculated to the intake passage to reduce the oxygen concentration of the intake air, thereby reducing the oxygen concentration in the engine (inside the cylinder). An EGR system that suppresses the combustion temperature and reduces the amount of NOx generated is also provided.
　近年では、よりＮＯｘを低減させるため，高圧ＥＧＲシステムと低圧ＥＧＲシステムの２つのＥＧＲシステムを備えている。この高圧ＥＧＲシステムでは、高圧ＥＧＲガスとして過給システムのタービンより上流側の排気通路を通過する比較的高温の排気ガスの一部を高圧ＥＧＲ通路の高圧ＥＧＲクーラーにより冷却してから吸気通路に還流させている。また、低圧ＥＧＲシステムでは、低圧ＥＧＲガスとして過給システムのタービンより下流側の排気通路を通過する比較的低温の排気ガスの一部を低圧ＥＧＲ通路の低圧ＥＧＲクーラーにより冷却してから吸気通路に還流させている。 In recent years, two EGR systems, a high pressure EGR system and a low pressure EGR system, are provided to further reduce NOx. In this high-pressure EGR system, a part of the relatively high-temperature exhaust gas that passes through the exhaust passage upstream of the turbocharging system turbine as high-pressure EGR gas is cooled by the high-pressure EGR cooler in the high-pressure EGR passage and then returned to the intake passage. I am letting. In the low-pressure EGR system, a part of the relatively low-temperature exhaust gas passing through the exhaust passage downstream of the turbocharging system turbine as low-pressure EGR gas is cooled by the low-pressure EGR cooler in the low-pressure EGR passage and then the intake passage. Reflux.
　この低圧ＥＧＲガスは、過給システムのコンプレッサで過給されてから気筒内に入るが、排気ガスの一部であるため、低圧ＥＧＲクーラーに入る温度は大気の温度に比べれば高い温度（例えば１００℃～５００℃程度）となっており、このまま、低圧ＥＧＲガスが吸気と混合した混合ガスをコンプレッサで過給のために圧縮すると温度が高くなり、コンプレッサの中を高い温度の混合気が通過するために、ＥＧＲ量が減少し十分にＮＯｘを低減できない、また、コンプレッサの熱負荷が大きくなり、その耐久性が低下するという問題がある。 The low pressure EGR gas is supercharged by the compressor of the supercharging system and enters the cylinder. However, since the low pressure EGR gas is a part of the exhaust gas, the temperature entering the low pressure EGR cooler is higher than the atmospheric temperature (for example, 100 If the mixed gas mixed with the low-pressure EGR gas and the intake air is compressed for supercharging by the compressor, the temperature rises and the high-temperature air-fuel mixture passes through the compressor. For this reason, there is a problem that the amount of EGR is reduced and NOx cannot be sufficiently reduced, and the heat load of the compressor is increased and its durability is lowered.
　そのため、この低圧ＥＧＲシステムでは、排気通路と吸気通路を連結する低圧ＥＧＲ通路に低圧ＥＧＲクーラーを設けて、低圧ＥＧＲガスを冷却してから吸気通路に供給している。例えば、日本出願の特開２０１１－２２０１７１号公報に記載されているように、ターボチャージャのタービン下流の排気の一部を低圧ＥＧＲガスとしてターボチャージャのコンプレッサ上流の吸気通路へ還流させる低圧ＥＧＲ通路と、低圧ＥＧＲガスの流量を調節する手段と、低圧ＥＧＲガスとエンジン用の冷却水との間で熱交換させる低圧ＥＧＲクーラーと、低圧ＥＧＲクーラーを流れる冷却水の流量を調節する手段と、排気通路に配置された排気浄化触媒と、排気浄化触媒の温度を上昇させる手段と、を備え、内燃機関の冷間始動時において、排気浄化触媒の温度を上昇させ、排気浄化触媒が活性温度以上の場合に、低圧ＥＧＲガスの流量を増大させ且つ低圧ＥＧＲクーラーを流れる冷却水の流量を増大させる内燃機関の制御装置が提案されている。 Therefore, in this low pressure EGR system, a low pressure EGR cooler is provided in the low pressure EGR passage connecting the exhaust passage and the intake passage, and the low pressure EGR gas is cooled before being supplied to the intake passage. For example, as described in Japanese Patent Application Laid-Open No. 2011-220171, a low-pressure EGR passage that recirculates a part of the exhaust downstream of the turbine of the turbocharger as low-pressure EGR gas to the intake passage upstream of the compressor of the turbocharger; A means for adjusting the flow rate of the low-pressure EGR gas, a low-pressure EGR cooler for exchanging heat between the low-pressure EGR gas and the cooling water for the engine, a means for adjusting the flow rate of the cooling water flowing through the low-pressure EGR cooler, and an exhaust passage When the internal combustion engine is cold started, the temperature of the exhaust purification catalyst is increased, and the exhaust purification catalyst is at or above the activation temperature. Further, there is provided a control device for an internal combustion engine that increases the flow rate of the low-pressure EGR gas and increases the flow rate of the cooling water flowing through the low-pressure EGR cooler. It is.
　この低圧ＥＧＲクーラーでは、冷却媒体として、エンジンを冷却するためのエンジン用の冷却水を用いているが、熱交換で熱を受け取る側のエンジン用の冷却水の温度は約８０℃と比較的高い温度であり、一方の熱交換で熱を出して冷却される側の低圧ＥＧＲガスも排気浄化装置を通過しているため低い温度になっているので、低圧ＥＧＲクーラーにおける低圧ＥＧＲガスの冷却効率が悪いという問題がある。 In this low-pressure EGR cooler, engine cooling water for cooling the engine is used as a cooling medium, but the temperature of the engine cooling water on the side receiving heat by heat exchange is relatively high at about 80 ° C. The low-pressure EGR gas on the side that is heated and cooled by heat exchange on one side is also low because it passes through the exhaust purification device, so the cooling efficiency of the low-pressure EGR gas in the low-pressure EGR cooler is low There is a problem of being bad.
日本出願の特開２０１１－２２０１７１号公報Japanese Patent Application No. 2011-220171
　そこで、本発明者等は、内燃機関と電動発電機を備えたハイブリッドシステムを搭載したハイブリッド車両においては、電動発電機、インバーター、バッテリー等の電気機器を冷却する必要があり、エンジン用の冷却水の冷却水通路とは、独立した電動発電機用の冷却水通路を設けている。この電気機器の冷却に用いられる電動発電機用の冷却水の温度は５０℃程度と、エンジン用の冷却水の約８０℃の温度と比較すると低い温度になっているので、ハイブリッドシステムのエンジンに過給システムと低圧ＥＧＲシステムを備えたハイブリッド車両では、低圧ＥＧＲクーラーの冷却媒体として、従来技術のエンジン用の冷却水ではなく、電気機器用の冷却水を使用することで、低圧ＥＧＲクーラーの冷却性能を向上させ、低圧ＥＧＲガスの冷却効率を向上させることができるとの知見を得た。 Therefore, the present inventors need to cool electric equipment such as a motor generator, an inverter, and a battery in a hybrid vehicle equipped with a hybrid system including an internal combustion engine and a motor generator. This cooling water passage is provided with an independent cooling water passage for the motor generator. The temperature of the cooling water for the motor generator used for cooling the electric equipment is about 50 ° C., which is lower than the temperature of about 80 ° C. for the cooling water for the engine. In a hybrid vehicle equipped with a supercharging system and a low-pressure EGR system, the cooling water for the low-pressure EGR cooler is used by using the cooling water for the electric equipment instead of the cooling water for the engine of the prior art as the cooling medium for the low-pressure EGR cooler. It was found that the performance can be improved and the cooling efficiency of the low-pressure EGR gas can be improved.
　本発明は、上記のことを鑑みてなされたものであり、その目的は、ハイブリッドシステムの内燃機関に過給システムと低圧ＥＧＲシステムを備えたハイブリッドシステム、ハイブリッド車両、及び、ハイブリッドシステムのＥＧＲ方法において、十分なＥＧＲ量を確保できて気筒内で発生するＮＯｘ量を低減できるとともに、コンプレッサの熱負荷を低減して耐久性を向上できるハイブリッドシステム、ハイブリッド車両、及び、ハイブリッドシステムのＥＧＲ方法を提供することである。 The present invention has been made in view of the above, and an object of the present invention is to provide a hybrid system, a hybrid vehicle, and an EGR method for a hybrid system in which an internal combustion engine of the hybrid system is provided with a supercharging system and a low pressure EGR system. Provided are a hybrid system, a hybrid vehicle, and an EGR method for a hybrid system that can secure a sufficient EGR amount, reduce the amount of NOx generated in a cylinder, and reduce the heat load of a compressor to improve durability. That is.
　上記の目的を達成するための本発明のハイブリッドシステムは、電動発電機と、過給システムと低圧ＥＧＲシステムを有する内燃機関を備えたハイブリッドシステムにおいて、前記過給システムのタービンより下流側の排気通路と、前記過給システムのコンプレッサより上流側の吸気通路を接続する低圧ＥＧＲ通路に、低圧ＥＧＲクーラーを設けると共に、該低圧ＥＧＲクーラーでは、前記電動発電機を冷却する冷却水で低圧ＥＧＲガスを冷却するように構成する。 In order to achieve the above object, a hybrid system according to the present invention is a hybrid system including a motor generator, an internal combustion engine having a supercharging system and a low pressure EGR system, and an exhaust passage downstream of a turbine of the supercharging system. In addition, a low pressure EGR cooler is provided in a low pressure EGR passage connecting an intake passage upstream of the compressor of the supercharging system, and the low pressure EGR cooler cools the low pressure EGR gas with cooling water for cooling the motor generator. To be configured.
　この構成によれば、従来技術で低圧ＥＧＲクーラーで冷却水として用いていた、約８０℃程度の比較的高温のエンジン用の冷却水に対して、５０℃程度の低温の電動発電機用の冷却水を低圧ＥＧＲクーラーの冷却媒体として用いることで、低圧ＥＧＲクーラーの冷却効率及び冷却性能を向上させることができるので、低圧ＥＧＲガスの体積を低減でき、吸気通路に還流する低圧ＥＧＲガス量を増量させて、気筒で発生するＮＯｘ量を低減できると共に、低圧ＥＧＲガスの温度を低下させて、下流側のコンプレッサの熱負荷を低減して耐久性を向上させることができる。 According to this configuration, cooling for a motor generator having a low temperature of about 50 ° C. is used for cooling water for a relatively high temperature of about 80 ° C., which is used as cooling water in a low pressure EGR cooler in the prior art. By using water as the cooling medium for the low-pressure EGR cooler, the cooling efficiency and cooling performance of the low-pressure EGR cooler can be improved, so the volume of the low-pressure EGR gas can be reduced and the amount of low-pressure EGR gas recirculated to the intake passage can be increased. As a result, the amount of NOx generated in the cylinder can be reduced, the temperature of the low-pressure EGR gas can be lowered, the thermal load on the downstream compressor can be reduced, and the durability can be improved.
　また、上記のハイブリッドシステムにおいて、前記低圧ＥＧＲ通路を前記排気通路に配置された排気ガス浄化装置よりも下流側の排気通路から分岐して構成すると、低圧ＥＧＲガスは、排気ガス中の未燃炭化水素（ＨＣ、黒煙）等が排気ガス浄化装置により除去されてから、低圧ＥＧＲクーラーを経由して吸気通路に還流されるので、低圧ＥＧＲクーラー、コンプレッサ、吸気通路への未燃炭化水素の堆積量を低減することができ、これらの機器の性能を良好な状態のまま維持することができる。 Further, in the above hybrid system, when the low pressure EGR passage is configured to branch from an exhaust passage downstream of the exhaust gas purification device disposed in the exhaust passage, the low pressure EGR gas is unburned carbonized in the exhaust gas. Since hydrogen (HC, black smoke), etc. is removed by the exhaust gas purification device, it is returned to the intake passage via the low-pressure EGR cooler, so that unburned hydrocarbons accumulate on the low-pressure EGR cooler, compressor, and intake passage The amount can be reduced and the performance of these devices can be maintained in good condition.
　また、上記のハイブリッドシステムにおいて、前記低圧ＥＧＲクーラーに供給する冷却水の流量を調整する冷却水量調整装置と、前記低圧ＥＧＲクーラーに流入する低圧ＥＧＲガスの温度を検出する排気ガス温度検出装置と、前記冷却水量調整装置を制御する制御装置を備え、該制御装置を、低圧ＥＧＲを停止しているとき、若しくは、前記排気ガス温度検出装置の検出温度が予め設定した第１設定温度以下であるときは、前記低圧ＥＧＲクーラーに流入する冷却水の流量を予め設定した最低流量にすると共に、前記検出温度が前記第１設定温度を超えるときは、前記低圧ＥＧＲクーラーに流入する冷却水の流量を前記検出温度に応じて変化する予め設定した設定量にするように前記冷却水量調整装置を制御するように構成すると次のような効果を奏することができる。 In the hybrid system, a cooling water amount adjusting device for adjusting a flow rate of cooling water supplied to the low pressure EGR cooler, an exhaust gas temperature detecting device for detecting a temperature of the low pressure EGR gas flowing into the low pressure EGR cooler, A control device for controlling the cooling water amount adjusting device is provided, and when the low pressure EGR is stopped, or when the detected temperature of the exhaust gas temperature detecting device is equal to or lower than a preset first set temperature. The flow rate of the cooling water flowing into the low pressure EGR cooler is set to a preset minimum flow rate, and when the detected temperature exceeds the first set temperature, the flow rate of the cooling water flowing into the low pressure EGR cooler is When the cooling water amount adjusting device is configured to control the preset amount to change in accordance with the detected temperature, it is as follows. It is possible to achieve the effect.
　この構成によれば、排気ガスの温度に従って、低圧ＥＧＲクーラーへの冷却水の流量を変化させていくことで、低圧ＥＧＲクーラーの冷却量をエンジンの運転状態に応じて最適化することができる。 According to this configuration, the cooling amount of the low-pressure EGR cooler can be optimized according to the operating state of the engine by changing the flow rate of the cooling water to the low-pressure EGR cooler according to the temperature of the exhaust gas.
　そして、上記の目的を達成するための本発明のハイブリッド車両は、上記のハイブリッドシステムを備えて構成され、上記のハイブリッドシステムと同様の効果を奏することができる。 And the hybrid vehicle of this invention for achieving said objective is comprised including said hybrid system, and there can exist an effect similar to said hybrid system.
　そして、上記の目的を達成するための本発明のハイブリッドシステムのＥＧＲ方法は、電動発電機と、過給システムと低圧ＥＧＲシステムを有する内燃機関を備えたハイブリッドシステムのＥＧＲ方法において、前記過給システムのタービンより下流側の排気通路と、前記過給システムのコンプレッサより上流側の吸気通路を接続する低圧ＥＧＲ通路に設けた低圧ＥＧＲクーラーで、前記電動発電機を冷却する冷却水で低圧ＥＧＲガスを冷却することを特徴とする方法である。この方法によれば、上記のハイブリッドシステム及びハイブリッド車両と同様な効果を奏することができる。 In order to achieve the above object, an EGR method for a hybrid system according to the present invention is an EGR method for a hybrid system including a motor generator and an internal combustion engine having a supercharging system and a low-pressure EGR system. The low pressure EGR cooler provided in the low pressure EGR passage connecting the exhaust passage downstream of the turbine and the intake passage upstream of the compressor of the supercharging system, and the low pressure EGR gas is cooled with cooling water for cooling the motor generator. It is a method characterized by cooling. According to this method, the same effects as those of the hybrid system and the hybrid vehicle can be obtained.
　本発明のハイブリッドシステム、ハイブリッド車両、及び、ハイブリッドシステムのＥＧＲ方法によれば、約８０℃程度の比較的高い温度のエンジン用の冷却水を用いることなく、５０℃程度の比較的低い温度の電動発電機用の冷却水を低圧ＥＧＲクーラーの冷却媒体として用いることで、低圧ＥＧＲガスの冷却効率及び冷却性能を向上させることができるので、低圧ＥＧＲガスの体積を低減でき、吸気通路に還流する低圧ＥＧＲガス量を増量させて、気筒内で発生するＮＯｘ量を低減することができると共に、低圧ＥＧＲガスの温度を低下させて、コンプレッサの熱負荷を低減して耐久性を向上させることができる According to the hybrid system, the hybrid vehicle, and the EGR method of the hybrid system of the present invention, electric power having a relatively low temperature of about 50 ° C. is used without using coolant for a relatively high temperature engine of about 80 ° C. By using the cooling water for the generator as a cooling medium for the low-pressure EGR cooler, the cooling efficiency and cooling performance of the low-pressure EGR gas can be improved, so that the volume of the low-pressure EGR gas can be reduced and the low-pressure EGR gas is returned to the intake passage The amount of NOx generated in the cylinder can be reduced by increasing the amount of EGR gas, and the temperature of the low-pressure EGR gas can be reduced to reduce the thermal load of the compressor and improve the durability.
図１は、本発明に係る実施の形態のハイブリッドシステムの構成の一例を示す図である。FIG. 1 is a diagram illustrating an example of a configuration of a hybrid system according to an embodiment of the present invention.
　以下、本発明に係る実施の形態のハイブリッドシステム、ハイブリッド車両、及び、ハイブリッドシステムのＥＧＲ方法について、図面を参照しながら説明する。なお、ここでは、過給システムを二段過給システムの構成で説明するが、本発明では、必ずしも二段過給システムである必要はなく、単段の過給システムでも多段の過給システムでもよく、過給システムを有していればよい。 Hereinafter, a hybrid system, a hybrid vehicle, and an EGR method of the hybrid system according to embodiments of the present invention will be described with reference to the drawings. Here, the supercharging system will be described with the configuration of a two-stage supercharging system. However, in the present invention, it is not always necessary to be a two-stage supercharging system. It only has to have a supercharging system.
　図１に示すように、本発明の実施の形態のハイブリッドシステム１は、エンジン（内燃機関）１０と電動発電機３０を備えて構成され、また、本発明の実施の形態のハイブリッド車両（図示しない）は、ハイブリッドシステム１のエンジン１０の動力と電動発電機３０の動力を車輪（図示しない）に伝達することで走行する車両である。 As shown in FIG. 1, a hybrid system 1 according to an embodiment of the present invention is configured to include an engine (internal combustion engine) 10 and a motor generator 30, and a hybrid vehicle (not shown) according to an embodiment of the present invention. ) Is a vehicle that travels by transmitting the power of the engine 10 of the hybrid system 1 and the power of the motor generator 30 to wheels (not shown).
　また、このエンジン１０は、エンジン本体１１と吸気通路１２と排気通路１３と高圧ＥＧＲ通路１４と低圧ＥＧＲ通路１５を備えている。この吸気通路１２には、上流側より順に、エアクリーナ１６、低圧段過給システム４の低圧段ターボチャージャ１７の低圧段コンプレッサ１７ｂ、ターボ間冷却装置１８、高圧段過給システム３の高圧段ターボチャージャ１９の高圧段コンプレッサ１９ｂ、インタークーラー２０、吸気絞り弁２１等が設けられる。また、排気通路１３には、上流側より順に、高圧段過給システム３の高圧段ターボチャージャ１９の高圧段タービン１９ａ、低圧段過給システム４の低圧段ターボチャージャ１７の低圧段タービン１７ａ、排気ガス浄化装置２２、排気絞り弁２３等が設けられる。 The engine 10 also includes an engine body 11, an intake passage 12, an exhaust passage 13, a high pressure EGR passage 14, and a low pressure EGR passage 15. In this intake passage 12, the air cleaner 16, the low-pressure stage compressor 17 b of the low-pressure stage turbocharger 17 of the low-pressure stage turbocharging system 4, the inter-turbo cooling device 18, and the high-pressure stage turbocharger of the high-pressure stage supercharging system 3 are arranged in this order from the upstream side. 19 high-pressure compressors 19b, an intercooler 20, an intake throttle valve 21 and the like are provided. In addition, in the exhaust passage 13, in order from the upstream side, the high-pressure turbine 19a of the high-pressure turbocharger 19 of the high-pressure turbocharging system 3, the low-pressure turbine 17a of the low-pressure turbocharger 17 of the low-pressure turbocharging system 4, and the exhaust A gas purification device 22, an exhaust throttle valve 23, and the like are provided.
　この高圧段過給システム３は、高圧段タービン１９ａと高圧段コンプレッサ１９ｂを備える高圧段ターボチャージャ１９で構成される過給システムであり、エンジン本体１１の排気ガスＧａのエネルギーを利用して高圧段タービン１９ａを回転させ、この回転力で高圧段タービン１９ａに接続する高圧段コンプレッサ１９ｂを稼動させて吸気Ａ＋Ｇｅｌを圧縮し、エンジン本体１１の各気筒内への吸気量を増量させるシステムである。 The high-pressure stage supercharging system 3 is a supercharging system including a high-pressure stage turbocharger 19 including a high-pressure stage turbine 19a and a high-pressure stage compressor 19b. The high-pressure stage supercharging system 3 uses the energy of the exhaust gas Ga of the engine body 11 to In this system, the turbine 19a is rotated, and a high-pressure compressor 19b connected to the high-pressure turbine 19a is operated by this rotational force to compress the intake air A + Gel and increase the intake air amount into each cylinder of the engine body 11.
　同様に、低圧段過給システム４は、低圧段タービン１７ａと低圧段コンプレッサ１７ｂを備える低圧段ターボチャージャ１７で構成される過給システムであり、エンジン本体１１の排気ガスＧａのエネルギーを利用して低圧段タービン１７ａを回転させ、この回転力で低圧段タービン１７ａに接続する低圧段コンプレッサ１７ｂを稼動させて吸気Ａ＋Ｇｅｌを圧縮し、エンジン本体１１の各気筒内への吸気量を増量させるシステムである。 Similarly, the low-pressure stage supercharging system 4 is a supercharging system including a low-pressure stage turbocharger 17 including a low-pressure stage turbine 17a and a low-pressure stage compressor 17b, and uses the energy of the exhaust gas Ga of the engine body 11. This system rotates the low-pressure stage turbine 17a and operates the low-pressure stage compressor 17b connected to the low-pressure stage turbine 17a with this rotational force to compress the intake air A + Gel, thereby increasing the intake air amount into each cylinder of the engine body 11. .
　なお、図１に示すように、この高圧段過給システム３の高圧段タービン１９ａの上流側の排気通路１３から分岐し、高圧段タービン１９ａの下流側の排気通路１３に合流する高圧段タービン用バイパス通路１９ｃを設け、この高圧段タービン用バイパス通路１９ｃに高圧段タービン用開閉バルブ１９ｅを設ける。同様に、高圧段コンプレッサ１９ｂの上流側の吸気通路１２より分岐し、高圧段コンプレッサ１９ｂの下流側の吸気通路１２に合流する高圧段コンプレッサ用バイパス通路１９ｄを設け、この高圧段コンプレッサ用バイパス通路１９ｄに高圧段コンプレッサ用開閉バルブ１９ｆを設ける。 As shown in FIG. 1, for the high-pressure turbine that branches from the exhaust passage 13 upstream of the high-pressure turbine 19a of the high-pressure turbocharging system 3 and merges with the exhaust passage 13 downstream of the high-pressure turbine 19a. A bypass passage 19c is provided, and a high-pressure turbine open / close valve 19e is provided in the high-pressure turbine bypass passage 19c. Similarly, a high-pressure compressor bypass passage 19d that branches from the intake passage 12 upstream of the high-pressure compressor 19b and joins the intake passage 12 downstream of the high-pressure compressor 19b is provided, and this high-pressure compressor bypass passage 19d. Is provided with an open / close valve 19f for a high-pressure compressor.
　エンジン１０への要求トルクが大きく、高圧段過給システム３及び低圧段過給システム４の両方で吸気Ａ＋Ｇｅｌを過給するときは、この開閉バルブ１９ｅ、１９ｆを両方とも閉状態にして、排気ガスＧａ及び吸気Ａ＋Ｇｅｌが高圧段タービン１９ａ及び高圧段コンプレッサ１９ｂを通過するようにして、高圧段過給システム３による吸気Ａ＋Ｇｅｌの過給を行う。 When the required torque to the engine 10 is large and both the high-pressure stage supercharging system 3 and the low-pressure stage supercharging system 4 are supercharged with intake air A + Gel, both the open / close valves 19e and 19f are closed and the exhaust gas is exhausted. The intake air A + Gel is supercharged by the high pressure stage supercharging system 3 so that Ga and the intake air A + Gel pass through the high pressure stage turbine 19a and the high pressure stage compressor 19b.
　一方、エンジン１０への要求トルクが小さく、低圧段過給システム４のみで吸気Ａ＋Ｇｅｌを十分過給できるときは、開閉バルブ１９ｅを開状態にして、排気ガスＧａがバイパス通路１９ｃを通過するようにして、高圧段過給システム３による吸気Ａ＋Ｇｅｌの過給が行われないようにするとともに、開閉バルブ１９ｆを開状態にして、吸気Ａ＋Ｇｅｌがバイパス通路１９ｄを通過するようにして、高圧段コンプレッサ１９ｂが吸気Ａ＋Ｇｅｌの抵抗とならないようにする。 On the other hand, when the required torque to the engine 10 is small and the intake air A + Gel can be sufficiently supercharged only by the low pressure stage supercharging system 4, the on-off valve 19e is opened so that the exhaust gas Ga passes through the bypass passage 19c. Thus, the high pressure stage supercharging system 3 prevents the supercharging of the intake air A + Gel and opens the on-off valve 19f so that the intake air A + Gel passes through the bypass passage 19d. Do not become the resistance of intake A + Gel.
　また、高圧ＥＧＲシステム５は、高圧ＥＧＲ通路１４と高圧ＥＧＲクーラー２４と高圧ＥＧＲバルブ２５で構成されるＥＧＲシステムであり、この高圧ＥＧＲ通路１４は、高圧段タービン１９ａより上流側の排気通路１３と高圧段コンプレッサ１９ｂより下流側の吸気通路１２を接続していて、上流側より順に、高圧ＥＧＲクーラー２４と高圧ＥＧＲバルブ２５が設けられている。この高圧ＥＧＲバルブ２５で、吸気通路１２に還流する高圧ＥＧＲガスＧｅｈの流量を調整する。 The high pressure EGR system 5 is an EGR system including a high pressure EGR passage 14, a high pressure EGR cooler 24, and a high pressure EGR valve 25. The high pressure EGR passage 14 is connected to the exhaust passage 13 upstream of the high pressure stage turbine 19a. A high-pressure EGR cooler 24 and a high-pressure EGR valve 25 are provided in order from the upstream side. This high pressure EGR valve 25 adjusts the flow rate of the high pressure EGR gas Geh recirculating to the intake passage 12.
　そして、この高圧段タービン１９ａより上流側の排気通路１３を通過する高温の排気ガスＧの一部を高圧ＥＧＲガスＧｅｈとして高圧ＥＧＲ通路１４の高圧ＥＧＲクーラー２４により冷却してから吸気通路１２に還流して、吸気の酸素濃度を低下させることで、気筒内での燃焼温度を抑制し、ＮＯｘ発生量を低減する。 A part of the high-temperature exhaust gas G passing through the exhaust passage 13 upstream of the high-pressure turbine 19 a is cooled by the high-pressure EGR cooler 24 of the high-pressure EGR passage 14 as the high-pressure EGR gas Geh and then returned to the intake passage 12. Then, by reducing the oxygen concentration of the intake air, the combustion temperature in the cylinder is suppressed, and the amount of NOx generated is reduced.
　同様に、低圧ＥＧＲシステム６は、低圧ＥＧＲ通路１５と低圧ＥＧＲクーラー２６と低圧ＥＧＲバルブ２７で構成されるＥＧＲシステムであり、この低圧ＥＧＲ通路１５は、低圧段タービン１７ａより下流側の排気通路１３と低圧段コンプレッサ１７ｂより上流側の吸気通路１２を接続していて、上流側より順に、低圧ＥＧＲクーラー２６と低圧ＥＧＲバルブ２７が設けられている。この低圧ＥＧＲバルブ２７で、吸気通路１２に還流する低圧ＥＧＲガスＧｅｌの流量を調整する。 Similarly, the low pressure EGR system 6 is an EGR system including a low pressure EGR passage 15, a low pressure EGR cooler 26, and a low pressure EGR valve 27. The low pressure EGR passage 15 is an exhaust passage 13 downstream of the low pressure turbine 17a. Are connected to the intake passage 12 upstream of the low-pressure compressor 17b, and a low-pressure EGR cooler 26 and a low-pressure EGR valve 27 are provided in this order from the upstream side. This low pressure EGR valve 27 adjusts the flow rate of the low pressure EGR gas Gel recirculating to the intake passage 12.
　そして、低圧段タービン１７ａより下流側の排気通路１３を通過する低温の排気ガスＧａの一部を低圧ＥＧＲガスＧｅｌとして低圧ＥＧＲ通路１５の低圧ＥＧＲクーラー２６により冷却してから吸気通路１２に還流して、吸気の酸素濃度を低下させることで、エンジン本体１１での燃焼濃度を抑制し、ＮＯｘ発生量を低減する。 A part of the low-temperature exhaust gas Ga passing through the exhaust passage 13 on the downstream side of the low-pressure turbine 17a is cooled as the low-pressure EGR gas Gel by the low-pressure EGR cooler 26 of the low-pressure EGR passage 15, and then returned to the intake passage 12. Thus, by reducing the oxygen concentration of the intake air, the combustion concentration in the engine body 11 is suppressed, and the amount of NOx generated is reduced.
　また、排気ガス温度センサ（排気ガス温度検出装置）３３を低圧段タービン１７ａより下流側でかつ低圧ＥＧＲ通路１５との接続点より上流側の排気通路１３に備える。この排気ガス温度センサ３３は、図１に示すように排気ガス浄化装置２２より上流側に設けてもよいし、排気ガス浄化装置２２より下流側に設けてもよい。 Also, an exhaust gas temperature sensor (exhaust gas temperature detection device) 33 is provided in the exhaust passage 13 downstream from the low-pressure turbine 17 a and upstream from the connection point with the low-pressure EGR passage 15. As shown in FIG. 1, the exhaust gas temperature sensor 33 may be provided on the upstream side of the exhaust gas purification device 22, or may be provided on the downstream side of the exhaust gas purification device 22.
　そして、大気から導入されエアクリーナ１６を経由した新気Ａが低圧ＥＧＲクーラー２６及び低圧ＥＧＲバルブ２７を経由して低圧ＥＧＲ通路１５より還流される低圧ＥＧＲガスＧｅｌと合流後、吸気Ａ＋Ｇｅｌとして、低圧段コンプレッサ１７ｂ、ターボ間冷却装置１８、高圧段コンプレッサ１９ｂ、インタークーラー２０、吸気絞り弁２１を経由し、さらに、この吸気Ａ＋Ｇｅｌが、高圧ＥＧＲクーラー２４及び高圧ＥＧＲバルブ２５を経由して高圧ＥＧＲ通路１４より還流される高圧ＥＧＲガスＧｅｈと合流後、吸気Ａ＋Ｇｅｌ＋Ｇｅｈとして、エンジン本体１１の各気筒内に送られる。 Then, after the fresh air A introduced from the atmosphere and passed through the air cleaner 16 merges with the low pressure EGR gas Gel recirculated from the low pressure EGR passage 15 via the low pressure EGR cooler 26 and the low pressure EGR valve 27, the intake air A + Gel is converted into the low pressure stage. The compressor 17 b, the inter-turbo cooling device 18, the high-pressure compressor 19 b, the intercooler 20, the intake throttle valve 21, and the intake air A + Gel are further supplied from the high-pressure EGR passage 14 via the high-pressure EGR cooler 24 and the high-pressure EGR valve 25. After merging with the high-pressure EGR gas Geh to be recirculated, it is sent into each cylinder of the engine body 11 as intake A + Gel + Geh.
　この気筒内では、吸気Ａ＋Ｇｅｌ＋Ｇｅｈは、燃料噴射装置（図示しない）より噴射された燃料と混合圧縮されて、燃料が着火及び燃焼する。この燃焼により発生した排気ガスＧは、排気通路１３に流出し、その一部が高圧ＥＧＲ通路１４に高圧ＥＧＲガスＧｅｈとして分岐され、残りの排気ガスＧａ（＝Ｇ－Ｇｅｈ）は高圧段タービン１９ａ及び低圧段タービン１７ａを経由して排気ガス浄化装置２２により浄化される。この浄化処理された排気ガスＧｃは、その一部が低圧ＥＧＲ通路１５に低圧ＥＧＲガスＧｅｌとして分岐され、残りの排気ガスＧｂ（＝Ｇｃ－Ｇｅｌ）は、排気絞り弁２３及びマフラー（図示しない）を経由して大気へ放出される。 In this cylinder, the intake air A + Gel + Geh is mixed and compressed with fuel injected from a fuel injection device (not shown), and the fuel is ignited and burned. The exhaust gas G generated by this combustion flows out into the exhaust passage 13, a part of which is branched into the high-pressure EGR passage 14 as the high-pressure EGR gas Geh, and the remaining exhaust gas Ga (= G-Geh) is supplied to the high-pressure turbine 19a. Then, the exhaust gas is purified by the exhaust gas purification device 22 via the low-pressure turbine 17a. A part of the purified exhaust gas Gc is branched into the low-pressure EGR passage 15 as a low-pressure EGR gas Gel, and the remaining exhaust gas Gb (= Gc-Gel) is exhausted through an exhaust throttle valve 23 and a muffler (not shown). To the atmosphere via
　そして、本発明においては、図１に示すように、低圧ＥＧＲクーラー２６において、電動発電機３０を冷却する冷却水で低圧ＥＧＲガスＧｅｌを冷却するように構成する。つまり、電動発電機３０を冷却する冷却水Ｗが循環する冷却水循環通路３１の電動発電機３０より下流側の分岐点Ｐ１から冷却水Ｗの一部である冷却水Ｗｂを分岐し、低圧ＥＧＲクーラー２６を経由してから、冷却水循環通路３１の合流点Ｐ２に合流するバイパス通路３２を設ける。また、分岐点Ｐ１に流量調整弁（冷却水量調整装置）３４を設け、バイパス通路３２を流れる冷却水Ｗｂの流量を調整できるように構成する。 In the present invention, as shown in FIG. 1, the low pressure EGR cooler 26 is configured to cool the low pressure EGR gas Gel with the cooling water that cools the motor generator 30. That is, the cooling water Wb which is a part of the cooling water W is branched from the branch point P1 downstream of the motor generator 30 in the cooling water circulation passage 31 through which the cooling water W for cooling the motor generator 30 circulates, and the low-pressure EGR cooler. 26, a bypass passage 32 that joins the joining point P2 of the cooling water circulation passage 31 is provided. Further, a flow rate adjusting valve (cooling water amount adjusting device) 34 is provided at the branch point P1 so that the flow rate of the cooling water Wb flowing through the bypass passage 32 can be adjusted.
　これにより、従来技術において、低圧ＥＧＲクーラー２６で冷却水として用いていた、約８０℃程度の比較的高温のエンジン用の冷却水の替りに、５０℃程度の低温の電動発電機用の冷却水Ｗｂを低圧ＥＧＲクーラー２６の冷却媒体として用いることで、低圧ＥＧＲクーラー２６の冷却効率及び冷却性能を向上させることができる。 Thereby, instead of the cooling water for the relatively high temperature engine of about 80 ° C. used as the cooling water in the low pressure EGR cooler 26 in the prior art, the cooling water for the low temperature motor generator of about 50 ° C. By using Wb as a cooling medium for the low-pressure EGR cooler 26, the cooling efficiency and cooling performance of the low-pressure EGR cooler 26 can be improved.
　また、低圧段タービン１７ａより下流側でかつ低圧ＥＧＲ通路１５との接続点より上流側の排気通路１３に、排気ガス浄化装置２２を配設して構成する。つまり、低圧ＥＧＲ通路１５を排気通路１３に配置された排気ガス浄化装置２２よりも下流側の排気通路１３から分岐して構成する。 Further, an exhaust gas purification device 22 is arranged in the exhaust passage 13 downstream from the low-pressure turbine 17a and upstream from the connection point with the low-pressure EGR passage 15. That is, the low-pressure EGR passage 15 is configured to be branched from the exhaust passage 13 on the downstream side of the exhaust gas purification device 22 arranged in the exhaust passage 13.
　この排気ガス浄化装置２２は、排気ガスＧａに含有される窒素酸化物（ＮＯｘ）、未燃炭化水素（ＨＣ）、一酸化炭素（ＣＯ）、微粒子物質（ＰＭ）等の浄化対象成分を除去する装置であり、酸化触媒装置（ＤＯＣ）や微粒子捕集装置（ＤＰＤ）や選択還元型触媒装置（ＳＣＲ）等で構成される。 The exhaust gas purification device 22 removes components to be purified such as nitrogen oxide (NOx), unburned hydrocarbon (HC), carbon monoxide (CO), and particulate matter (PM) contained in the exhaust gas Ga. It is an apparatus, and is composed of an oxidation catalyst device (DOC), a particulate collection device (DPD), a selective catalytic reduction device (SCR), and the like.
　この構成により、排気ガスＧａは、未燃炭化水素（ＨＣ、黒煙）等が排気ガス浄化装置２２により除去されてから、その一部である低圧ＥＧＲガスＧｅｌが低圧ＥＧＲクーラー２６を経由して吸気通路１２に還流されるので、低圧ＥＧＲクーラー２６、低圧段コンプレッサ１７ｂ、高圧段コンプレッサ１９ｂ、吸気通路１２への未燃炭化水素が付着及び堆積することを防止することができ、これらの機器の性能を良好な状態のまま維持することができる。 With this configuration, after the unburned hydrocarbon (HC, black smoke) and the like are removed by the exhaust gas purification device 22, the low-pressure EGR gas Gel that is a part of the exhaust gas Ga passes through the low-pressure EGR cooler 26. Since the refrigerant is recirculated to the intake passage 12, the low pressure EGR cooler 26, the low pressure stage compressor 17b, the high pressure stage compressor 19b, and the unburned hydrocarbons on the intake passage 12 can be prevented from adhering and accumulating. The performance can be maintained in a good state.
　さらに、流量調整弁３４を制御する制御装置４１を設ける。この制御装置４１は、アクセル開度センサ（図示しない）等の各種センサの情報に基づいて、ハイブリッドシステム１の全般の制御を行う全体システム制御装置４０に組み込んでもよいし、独立して設けてもよい。 Furthermore, a control device 41 for controlling the flow rate adjusting valve 34 is provided. The control device 41 may be incorporated in the overall system control device 40 that performs overall control of the hybrid system 1 based on information from various sensors such as an accelerator opening sensor (not shown), or may be provided independently. Good.
　そして、この制御装置４１で、低圧ＥＧＲクーラー２６に流入する低圧ＥＧＲガスＧｅｌの温度を検出する排気ガス温度センサ（排気ガス温度検出装置）３３の検出値を入力して、低圧ＥＧＲクーラー２６に供給する冷却水Ｗｂの流量Ｖｗを調整する流量調整弁（冷却水量調整装置）３４を制御するように構成する。 The control device 41 inputs a detection value of an exhaust gas temperature sensor (exhaust gas temperature detection device) 33 for detecting the temperature of the low pressure EGR gas Gel flowing into the low pressure EGR cooler 26 and supplies the detected value to the low pressure EGR cooler 26. The flow rate adjusting valve (cooling water amount adjusting device) 34 for adjusting the flow rate Vw of the cooling water Wb to be controlled is controlled.
　つまり、この制御装置４１を、低圧ＥＧＲを停止しているとき、若しくは、排気ガス温度センサ３３の検出温度Ｔｍが予め設定した第１設定温度Ｔ１（例えば、５０℃～２００℃の範囲内の温度）以下であるときは、低圧ＥＧＲクーラー２６に流入する冷却水Ｗｂの流量Ｖｗを予め設定した最低流量Ｖｍｉｎにすると共に、検出温度Ｔｍが第１設定温度Ｔ１を超えるときは、低圧ＥＧＲクーラー２６に流入する冷却水Ｗｂの流量Ｖｗを検出温度Ｔｍに応じて変化する予め設定した設定量Ｖ（Ｔｍ）にするように流量調整弁３４を制御するように構成する。なお、この第１設定温度Ｔ１と最低流量Ｖｍｉｎは、実験などにより予め設定し制御装置４１に記憶させておいたり、制御装置４１で算定できるようにしておいたりする。 That is, when the low pressure EGR is stopped or the detected temperature Tm of the exhaust gas temperature sensor 33 is set in advance to the control device 41, the first set temperature T1 (for example, a temperature within a range of 50 ° C. to 200 ° C.). ) When it is below, the flow rate Vw of the cooling water Wb flowing into the low pressure EGR cooler 26 is set to the preset minimum flow rate Vmin, and when the detected temperature Tm exceeds the first set temperature T1, the low pressure EGR cooler 26 The flow rate adjustment valve 34 is configured to control the flow rate Vw of the flowing cooling water Wb to a preset set amount V (Tm) that changes according to the detected temperature Tm. The first set temperature T1 and the minimum flow rate Vmin are set in advance by experiments or the like and stored in the control device 41, or can be calculated by the control device 41.
　これにより、エンジン１０が始動時や低負荷状態などで、低圧ＥＧＲクーラー２６に流入する低圧ＥＧＲガスＧｅｌの温度Ｔが第１設定温度Ｔ１以下であるときは、低圧ＥＧＲガスＧｅｌの熱量も少ないので、冷却水Ｗｂの流量Ｖｗを最低流量Ｖｍｉｎにして、循環用駆動ポンプ（図示しない）の消費電力を抑制して省エネルギー化を図る。 Thereby, when the temperature T of the low-pressure EGR gas Gel flowing into the low-pressure EGR cooler 26 is equal to or lower than the first set temperature T1 when the engine 10 is started or in a low load state, the amount of heat of the low-pressure EGR gas Gel is small. Then, the flow rate Vw of the cooling water Wb is set to the minimum flow rate Vmin, and the power consumption of the circulation drive pump (not shown) is suppressed to save energy.
　なお、エンジン１０が低負荷運転などで排気ガス温度が低いときには、冷却を再開する場合の冷却の開始のタイミング等を考慮して、最低流量Ｖｍｉｎの冷却水Ｗｂを流しておき、冷却開始からある程度の冷却が可能なようにする。 When the exhaust gas temperature is low, such as when the engine 10 is operating at a low load, the cooling water Wb having the minimum flow rate Vmin is allowed to flow in consideration of the timing of starting cooling when cooling is restarted. Allow cooling.
　また、エンジン１０が中負荷運転や高負荷運転で、低圧段タービン１７ａを通過後の排気ガスＧａの温度Ｔが第１設定温度Ｔ１を超えるときには、排気ガスＧａの温度Ｔに従って、例えば、第１設定温度Ｔ１と検出温度Ｔｍとの差が大きくなると冷却水Ｗｂの流量Ｖｗを多くする等して、冷却水Ｗｂの流量Ｖｗを変化させていく。 When the engine 10 is in a medium load operation or a high load operation and the temperature T of the exhaust gas Ga after passing through the low-pressure turbine 17a exceeds the first set temperature T1, according to the temperature T of the exhaust gas Ga, for example, the first When the difference between the set temperature T1 and the detected temperature Tm increases, the flow rate Vw of the cooling water Wb is changed, for example, by increasing the flow rate Vw of the cooling water Wb.
　これらにより、冷却水Ｗの循環用駆動ポンプの消費電力を、エンジン１０の運転状態に応じて最適化することができ、省エネルギー化を図ることができる。 Thus, the power consumption of the driving pump for circulating the cooling water W can be optimized according to the operating state of the engine 10, and energy saving can be achieved.
　そして、本発明に係る実施の形態のハイブリッドシステムのＥＧＲ方法は、電動発電機３０と、過給システム（ここでは二段過給システム）３、４と低圧ＥＧＲシステム６を有するエンジン１０を備えたハイブリッドシステム１のＥＧＲ方法であり、過給システム３、４のタービン（ここでは、低圧段過給システム４の低圧段タービン１７ａ）より下流側の排気通路１３と、過給システム３、４のコンプレッサ（ここでは、低圧段過給システム４の低圧段コンプレッサ１７ｂ）より上流側の吸気通路１２を接続する低圧ＥＧＲ通路１５に設けた低圧ＥＧＲクーラー２６で、電動発電機３０を冷却する冷却水Ｗで低圧ＥＧＲガスＧｅｌを冷却することを特徴とする方法である。 And the EGR method of the hybrid system of embodiment which concerns on this invention was provided with the engine 10 which has the motor generator 30, the supercharging system (here two-stage supercharging system) 3, 4 and the low voltage | pressure EGR system 6. This is an EGR method for the hybrid system 1, and the exhaust passage 13 on the downstream side of the turbines of the supercharging systems 3 and 4 (here, the low pressure stage turbine 17 a of the low pressure stage supercharging system 4), and the compressors of the supercharging systems 3 and 4 (Here, the low-pressure compressor 17b of the low-pressure turbocharging system 4) is a low-pressure EGR cooler 26 provided in the low-pressure EGR passage 15 that connects the intake passage 12 upstream of the low-pressure stage turbocharging system 4. This is a method characterized by cooling the low-pressure EGR gas Gel.
　上記の構成のハイブリッドシステム１、ハイブリッド車両、及び、ハイブリッドシステムのＥＧＲ方法によれば、約８０℃程度の比較的高い温度のエンジン用の冷却水を用いることなく、５０℃程度の比較的低い温度の電動発電機用の冷却水Ｗ（Ｗｂ）を低圧ＥＧＲクーラー２６の冷却媒体として用いることで、低圧ＥＧＲガスＧｌの冷却効率及び冷却性能を向上させることができるので、低圧ＥＧＲガスＧｅｌの体積を低減でき、吸気通路１２に還流する低圧ＥＧＲガス量を増量させて、気筒内で発生するＮＯｘ量を低減することができると共に、低圧ＥＧＲガスＧｅｌの温度を低下させて、低圧段コンプレッサ１７ｂと高圧段コンプレッサ１９ｂの熱負荷を低減して耐久性を向上させることができる According to the EGR method of the hybrid system 1, the hybrid vehicle, and the hybrid system configured as described above, a relatively low temperature of about 50 ° C. is used without using coolant for a relatively high temperature engine of about 80 ° C. By using the cooling water W (Wb) for the motor generator as a cooling medium for the low pressure EGR cooler 26, the cooling efficiency and cooling performance of the low pressure EGR gas Gl can be improved, so the volume of the low pressure EGR gas Gel is reduced. The amount of low-pressure EGR gas that can be reduced and recirculated to the intake passage 12 can be increased to reduce the amount of NOx generated in the cylinder, and the temperature of the low-pressure EGR gas Gel can be reduced to reduce the pressure of the low-pressure stage compressor 17b. Durability can be improved by reducing the thermal load on the stage compressor 19b.
１　ハイブリッドシステム
３　高圧段過給システム
４　低圧段過給システム
５　高圧ＥＧＲシステム
６　低圧ＥＧＲシステム
１０　エンジン（内燃機関）
１１　エンジン本体
１２　吸気通路
１３　排気通路
１４　高圧ＥＧＲ通路
１５　低圧ＥＧＲ通路
１６　エアクリーナ
１７　低圧段ターボチャージャ
１７ａ　低圧段タービン
１７ｂ　低圧段コンプレッサ
１８　ターボ間冷却装置
１９　高圧段ターボチャージャ
１９ａ　高圧段タービン
１９ｂ　高圧段コンプレッサ
１９ｃ　高圧段タービン用バイパス通路
１９ｄ　高圧段コンプレッサ用バイパス通路
１９ｅ　高圧段タービン用開閉バルブ
１９ｆ　高圧段コンプレッサ用開閉バルブ
２０　インタークーラー
２１　吸気絞り弁
２２　排気ガス浄化装置
２３　排気絞り弁
２４　高圧ＥＧＲクーラー
２５　高圧ＥＧＲバルブ
２６　低圧ＥＧＲクーラー
２７　低圧ＥＧＲバルブ
３０　電動発電機
３１　冷却水循環通路
３２　バイパス通路
３３　排気ガス温度センサ（排気ガス温度検出装置）
３４　流量調整弁（冷却水量調整装置）
４０　全体システム制御装置
４１　制御装置
Ａ　新気
Ｇ　気筒から出た排気ガス、
Ｇａ　高圧段タービン通過後の排気ガス
Ｇｂ　大気中に排出される排気ガス
Ｇｃ　浄化処理された排気ガス
Ｇｅｈ　高圧ＥＧＲガス
Ｇｅｌ　低圧ＥＧＲガス
Ｐ１　分岐点
Ｐ２　合流点
Ｔ　排気ガスの温度
Ｔｍ　排気ガス温度センサの検出温度
Ｔ１　第１設定温度
Ｖｗ　冷却水の流量
Ｖｍｉｎ　最低流量
Ｗ　冷却水
Ｗｂ　バイパス通路を通過する冷却水 DESCRIPTION OF SYMBOLS 1 Hybrid system 3 High pressure stage supercharging system 4 Low pressure stage supercharging system 5 High pressure EGR system 6 Low pressure EGR system 10 Engine (internal combustion engine)
DESCRIPTION OF SYMBOLS 11 Engine body 12 Intake passage 13 Exhaust passage 14 High pressure EGR passage 15 Low pressure EGR passage 16 Air cleaner 17 Low pressure stage turbocharger 17a Low pressure stage turbine 17b Low pressure stage compressor 18 Inter-turbo cooling device 19 High pressure stage turbocharger 19a High pressure stage turbine 19b High pressure stage compressor 19c Bypass passage for high-pressure turbine 19d Bypass passage for high-pressure compressor 19e Open / close valve for high-pressure turbine 19f Open / close valve for high-pressure compressor 20 Intercooler 21 Intake throttle valve 22 Exhaust gas purifier 23 Exhaust throttle valve 24 High pressure EGR cooler 25 High pressure EGR Valve 26 Low pressure EGR cooler 27 Low pressure EGR valve 30 Motor generator 31 Cooling water circulation passage 32 Bypass passage 33 Exhaust gas temperature sensor (exhaust gas temperature detection device)
34 Flow rate adjustment valve (cooling water amount adjustment device)
40 Overall system control device 41 Control device A Fresh air G Exhaust gas from cylinder,
Ga Exhaust gas Gb after passing through high-pressure turbine Exhaust gas Gc discharged into the atmosphere Purified exhaust gas Geh High pressure EGR gas Gel Low pressure EGR gas P1 Branch point P2 Junction point T Exhaust gas temperature Tm Exhaust gas temperature sensor Detection temperature T1 First set temperature Vw Cooling water flow rate Vmin Minimum flow rate W Cooling water Wb Cooling water passing through the bypass passage

Claims (5)

  1. 　電動発電機と、過給システムと低圧ＥＧＲシステムを有する内燃機関を備えたハイブリッドシステムにおいて、
    　前記過給システムのタービンより下流側の排気通路と、前記過給システムのコンプレッサより上流側の吸気通路を接続する低圧ＥＧＲ通路に、低圧ＥＧＲクーラーを設けると共に、
    　該低圧ＥＧＲクーラーでは、前記電動発電機を冷却する冷却水で低圧ＥＧＲガスを冷却するように構成したことを特徴とするハイブリッドシステム。     In a hybrid system comprising a motor generator, an internal combustion engine having a supercharging system and a low pressure EGR system,
    A low pressure EGR cooler is provided in a low pressure EGR passage connecting an exhaust passage downstream from the turbine of the supercharging system and an intake passage upstream of the compressor of the supercharging system;
    The low-pressure EGR cooler is configured to cool the low-pressure EGR gas with cooling water that cools the motor generator.
  2. 　前記低圧ＥＧＲ通路を前記排気通路に配置された排気ガス浄化装置よりも下流側の排気通路から分岐したことを特徴とする請求項１に記載のハイブリッドシステム。 The hybrid system according to claim 1, wherein the low-pressure EGR passage is branched from an exhaust passage downstream of an exhaust gas purification device disposed in the exhaust passage.
  3. 　前記低圧ＥＧＲクーラーに供給する冷却水の流量を調整する冷却水量調整装置と、前記低圧ＥＧＲクーラーに流入する低圧ＥＧＲガスの温度を検出する排気ガス温度検出装置と、前記冷却水量調整装置を制御する制御装置を備え、該制御装置を、低圧ＥＧＲを停止しているとき、若しくは、前記排気ガス温度検出装置の検出温度が予め設定した第１設定温度以下であるときは、前記低圧ＥＧＲクーラーに流入する冷却水の流量を予め設定した最低流量にすると共に、前記検出温度が前記第１設定温度を超えるときは、前記低圧ＥＧＲクーラーに流入する冷却水の流量を前記検出温度に応じて変化する予め設定した設定量にするように前記冷却水量調整装置を制御するように構成したことを特徴とする請求項１又は２に記載のハイブリッドシステム。 A cooling water amount adjusting device for adjusting the flow rate of cooling water supplied to the low pressure EGR cooler, an exhaust gas temperature detecting device for detecting the temperature of the low pressure EGR gas flowing into the low pressure EGR cooler, and the cooling water amount adjusting device are controlled. Provided with a control device, which flows into the low-pressure EGR cooler when the low-pressure EGR is stopped or when the detected temperature of the exhaust gas temperature detection device is equal to or lower than a preset first set temperature. The flow rate of the cooling water to be set is set to a preset minimum flow rate, and when the detected temperature exceeds the first set temperature, the flow rate of the cooling water flowing into the low pressure EGR cooler is changed in advance according to the detected temperature. The hybrid system according to claim 1 or 2, wherein the cooling water amount adjusting device is controlled so as to obtain a set amount. Temu.
  4. 　請求項１～３のいずれか１項に記載のハイブリッドシステムを備えたことを特徴とするハイブリッド車両。 A hybrid vehicle comprising the hybrid system according to any one of claims 1 to 3.
  5. 　電動発電機と、過給システムと低圧ＥＧＲシステムを有する内燃機関を備えたハイブリッドシステムのＥＧＲ方法において、
    　前記過給システムのタービンより下流側の排気通路と、前記過給システムのコンプレッサより上流側の吸気通路を接続する低圧ＥＧＲ通路に設けた低圧ＥＧＲクーラーで、前記電動発電機を冷却する冷却水で低圧ＥＧＲガスを冷却することを特徴とするハイブリッドシステムのＥＧＲ方法。     In an EGR method of a hybrid system comprising a motor generator, an internal combustion engine having a supercharging system and a low pressure EGR system,
    A low-pressure EGR cooler provided in a low-pressure EGR passage connecting an exhaust passage downstream from the turbine of the supercharging system and an intake passage upstream of the compressor of the supercharging system, with cooling water for cooling the motor generator A hybrid system EGR method comprising cooling low-pressure EGR gas.
PCT/JP2015/061704 2014-04-25 2015-04-16 Hybrid system, hybrid system vehicle, and egr method for hybrid system WO2015163227A1 (en)

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