GB2495756A - Cooling system for a hybrid powertrain having exhaust gas recirculation - Google Patents

Cooling system for a hybrid powertrain having exhaust gas recirculation Download PDF

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Publication number
GB2495756A
GB2495756A GB1118094.0A GB201118094A GB2495756A GB 2495756 A GB2495756 A GB 2495756A GB 201118094 A GB201118094 A GB 201118094A GB 2495756 A GB2495756 A GB 2495756A
Authority
GB
United Kingdom
Prior art keywords
low temperature
exhaust gas
gas recirculation
cooler
hybrid powertrain
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.)
Granted
Application number
GB1118094.0A
Other versions
GB201118094D0 (en
GB2495756B (en
Inventor
Gianmarco Brunetti
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.)
GM Global Technology Operations LLC
Original Assignee
GM Global Technology Operations LLC
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 GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Priority to GB1118094.0A priority Critical patent/GB2495756B/en
Publication of GB201118094D0 publication Critical patent/GB201118094D0/en
Publication of GB2495756A publication Critical patent/GB2495756A/en
Application granted granted Critical
Publication of GB2495756B publication Critical patent/GB2495756B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
    • 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
    • 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
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/08—Electric propulsion units
    • B60W2510/087—Temperature
    • 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
    • F01P2003/187—Arrangements or mounting of liquid-to-air heat-exchangers arranged 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
    • F01P2050/00—Applications
    • F01P2050/24—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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

A cooling system comprises a high temperature cooling circuit 20, a low temperature cooling circuit 30 and a motor generator unit (MGU) cooler 36 for a motor generator unit 10 which is connected along the low temperature cooling circuit 30 of an exhaust gas recirculation system (EGR) 300. The MGU 10 is connected downstream of a low temperature radiator 33 and upstream of a low temperature cooler 31 in the low temperature cooling circuit 30. A hybrid powertrain has an internal combustion engine, e.g. diesel engine 110, which has the exhaust gas recirculation system 300, at least one motor generator unit 10 and the cooling system.

Description

Cooling system for a hybrid powertrain provided with an EGR system
Technical field
The present invention relates to a cooling system for a hybrid powertrain with an internal combustion engine provided with an EGR system and at least one motor generator unit.
Background
There are known in the art internal combustion engines, both of the gasoline and diesel type1 provided with an Exhaust Gas Recirculation (EGR) system. EGR works by recirculating a portion of an engines exhaust gas back to the engine cylinders.
In diesel engines nowadays, the EGR technique has been developed in order to contain NO emissions: experimental activities have shown that mixing the air at the intake with a cooler exhaust gas helps reducing NO emissions.
To enhance the performance of the EGR system, one of the solutions that could be adopted uses an EGR cooler to cool down exhaust gases that exchanges heat with a coolant at a lower temperature that the engine one. Such solution, which is named "Low Temperature EGR", adopts a separated water circuit operating at a lower temperature (55°-65°C) than that of the traditional cooling system of the internal combustion engines (about 90 °C).
In a hybrid architecture also the Motor Generator Unit (MGU), i.e. the unit including an electric motor/generator and its electronics, requires a specific cooling circuit, due to a different operating temperature than that of the internal combustion engine.
Consequently, this involves an increase in terms of system complexity, space required to house all the components of a separate cooling system and weight.
An object of an embodiment of the present invention is to provide a cooling system for a hybrid powertrain provided with an EGR system which allows to limit the number of components and the space required for properly cooling the motor generator unit.
Another object of an embodiment of the present invention is to provide a cooling system for a hybrid powertrain provided with an EGR system which allows to reduce S the weight of the cooling system dedicated to the motor generator unit.
These objects are achieved by a cooling system for a hybrid powertrain having the features recited in claim 1. Further peculiar aspects of the cooling system are set out in the dependent claims.
Summary
One embodiment of the present invention provides a cooling system for the internal combustion engine of a hybrid powertrain including an exhaust gas recirculation (EGR) system, the cooling system including a high temperature cooling circuit for the exhaust gas recirculation system having a high temperature cooler, a low temperature cooling circuit for the exhaust gas recirculation system having a low temperature cooler, and a cooler for the motor generator unit of the hybrid powertrain connected along the low temperature cooling circuit for the exhaust gas recirculation system.
In this way, the cooling circuit for the motor generator unit is integrated in the low temperature cooling circuit for the EGR system by simply connecting the cooler for the electric motor/generator unit in the same low temperature circuit.
Indeed, the cooling system adopted to cool down the electric motor and its electronics must ensure temperatures under the 70°C, according to the requirements specification of these components. The idea is therefore to integrate the cooler for the MGU in the same cooling circuit of the EGR system which operates at a lower temperature, i.e. 55°-65°C. This allows to reduce the system complexity, the number of components, the weight and the cost of a hybrid architecture in order to reach fuel consumption and price targets.
According to an embodiment of the present invention, the cooler for the MGU is connected downstream a low temperature radiator and upstream the low temperature cooler in the low temperature circuit of the exhaust gas recirculation system.
According to another embodiment of the present invention, it is provided a hybrid powertrain with an internal combustion engine provided with an EGR system and at least one motor generator unit, wherein the hybrid powertrain has a cooling system in which a cooler for the motor generator unit of the hybrid powertrain is connected along the low temperature cooling circuit for the exhaust gas recirculation system.
The hybrid powertrain could have an internal combustion engine of the diesel type, i.e. a kind of engine which is usually provided with an EGR system to reduce NO emissions. However, this does not exclude to apply the same solution also to hybrid powertrains having a gasoline engine provided with an EGR system. I0
Brief Description of the Drawincjs
Further advantages and features of an embodiment of the present invention will be more apparent from the description below, provided with reference to the accompanying drawings, purely by way of a non-limiting example, wherein: -Figure 1 is a simplified scheme of a cooling system of a hybrid powertrain according to an embodiment of the present invention.
Detailed Description
Figure 1 shows a simplified scheme of a cooling system for at least one exemplary embodiment of a hybrid powertrain having at least one motor generator unit 10 and an internal combustion engine 110 with an exhaust gas recirculation (EGR) system 300.
The cooling system has a high temperature cooling circuit 20 (shown in thicker lines) for engine 110 and EGR 300 inciuding a high temperature EGR cooler 21 connected to the traditional cooling circuit for the engine 110, e.g. a cooling circuit having a surge tank 22, a high temperature radiator 23, a switchable pump 24 and a thermostat 25.
In order to enhance the performance of the EGR system 300, the cooling system further includes a low temperature circuit 30 with a low temperature EGR cooler 31.
The low temperature circuit 30, which operates at a lower temperature (55°-65°C) than that of the high temperature cooling circuit 20 (about 90 °C), may include for example an expansion vessel 32, a low temperature radiator 33 and an electric pump 34.
A MGU cooler 36 for the motor generator unit 10 is connected along the low temperature circuit 30 between the low temperature radiator 33 and the low temperature EGR cooler 31. With respect to the flow direction denoted by the letter "F" imparted by the electric pump 34, the cooling fluid outputs the low temperature radiator 33, for example at a temperature of 45 °C, and flows firstly in the cooler 36 in order to remove heat from the MGU 10 and maintain the motor generator 11 and its electronics 12 below a preset temperature, for example 70 °C, which is specified by the manufacturer of these components.
Due to the heat removal from the MGU 10, the cooling fluid outputs the MGIJ cooler 36 at a slightly higher temperature with respect to 45 °C, for example at a temperature in the range of 46-50 °C, but which is sufficient to remove heat from the EGR system 300 through the low temperature EGR cooler 31. From the latter, the temperature of the cooling fluid increases, for example at 51-55 00, and then can be lowered again through the low temperature radiator 33.
While at least one exemplary embodiment has been presented in the foregoing summary and detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration in any way. Rather, the foregoing summary and detailed description will provide those skilled in the art with a convenient road map for implementing at least one exemplary embodiment, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope as set forth in the appended claims and their legal equivalents.
List of references in the drawings motor generator unit (MGU) 11 motor generator 12 MGU electronics high temperature cooling circuit 21 high temperature EGR cooler 22 surge tank 23 high temperature radiator 24 switchable pump thermostat low temperature circuit 31 low temperature EGR cooler 32 expansion vessel 33 low temperature radiator 34 electric pump 36 MGU cooler internal combustion engine 300 exhaust gas recirculation (EGR) system F flow direction

Claims (2)

  1. <claim-text>CLAIMS1. A cooling system for a hybrid powertrain with an internal combustion engine (110) provided with an exhaust gas recirculation system (300) for the internal combustion engine (110) and at least one motor generator unit (10), the cooling system including: -a high temperature cooling circuit (20) for the exhaust gas recirculation system (300) including a high temperature cooler (21); -a low temperature cooling circuit (30) for the exhaust gas recirculation system (300) including a low temperature cooler (31), and -a MGU cooler (36) for said motor generator unit (10) connected along said low temperature cooling circuit (30) for the exhaust gas recirculation system (300).</claim-text> <claim-text>2. The cooling system according to claim 1, wherein the MGU cooler (36) for said motor generator unit (10) is connected downstream of a low temperature radiator (33) and upstream of said low temperature cooler (31) in the low temperature cooling circuit (3D) of the exhaust gas recirculation system (300).</claim-text> <claim-text>3. A hybrid powertrain with an internal combustion engine (110) provided with an exhaust gas recirculation system (300) and at least one motor generator unit (10), wherein the hybrid powertrain has a cooling system according to claim 1 and
  2. 2.</claim-text> <claim-text>4. The hybrid powertrain according to claim 3, wherein the internal combustion engine (110) is a diesel engine.</claim-text>
GB1118094.0A 2011-10-20 2011-10-20 Cooling system for a hybrid powertrain provided with an EGR system Expired - Fee Related GB2495756B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1118094.0A GB2495756B (en) 2011-10-20 2011-10-20 Cooling system for a hybrid powertrain provided with an EGR system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1118094.0A GB2495756B (en) 2011-10-20 2011-10-20 Cooling system for a hybrid powertrain provided with an EGR system

Publications (3)

Publication Number Publication Date
GB201118094D0 GB201118094D0 (en) 2011-11-30
GB2495756A true GB2495756A (en) 2013-04-24
GB2495756B GB2495756B (en) 2018-03-14

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006207495A (en) * 2005-01-28 2006-08-10 Toyota Motor Corp Egr cooling system for vehicle
JP2008267180A (en) * 2007-04-17 2008-11-06 Toyota Motor Corp Control device for variable flow rate water pump
JP2009174362A (en) * 2008-01-23 2009-08-06 Toyota Motor Corp Exhaust gas recirculation gas cooling device of hybrid vehicle
JP2009202794A (en) * 2008-02-28 2009-09-10 Toyota Motor Corp Heat management system
DE102010001752A1 (en) * 2010-02-10 2011-08-11 Ford Global Technologies, LLC, Mich. Cooling system for use in internal combustion engine of hybrid vehicle, has exhaust gas recirculation radiator connected with low temperature refrigerant circuit according to termination of warming-up phase

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006207495A (en) * 2005-01-28 2006-08-10 Toyota Motor Corp Egr cooling system for vehicle
JP2008267180A (en) * 2007-04-17 2008-11-06 Toyota Motor Corp Control device for variable flow rate water pump
JP2009174362A (en) * 2008-01-23 2009-08-06 Toyota Motor Corp Exhaust gas recirculation gas cooling device of hybrid vehicle
JP2009202794A (en) * 2008-02-28 2009-09-10 Toyota Motor Corp Heat management system
DE102010001752A1 (en) * 2010-02-10 2011-08-11 Ford Global Technologies, LLC, Mich. Cooling system for use in internal combustion engine of hybrid vehicle, has exhaust gas recirculation radiator connected with low temperature refrigerant circuit according to termination of warming-up phase

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Publication number Publication date
GB201118094D0 (en) 2011-11-30
GB2495756B (en) 2018-03-14

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20180614