GB2453561A - Regenerating a diesel engine exhaust gas aftertreatment device - Google Patents

Regenerating a diesel engine exhaust gas aftertreatment device Download PDF

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Publication number
GB2453561A
GB2453561A GB0719815A GB0719815A GB2453561A GB 2453561 A GB2453561 A GB 2453561A GB 0719815 A GB0719815 A GB 0719815A GB 0719815 A GB0719815 A GB 0719815A GB 2453561 A GB2453561 A GB 2453561A
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United Kingdom
Prior art keywords
diesel engine
aftertreatment device
oil
electric
regeneration
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
GB0719815A
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GB0719815D0 (en
GB2453561B (en
Inventor
Ian Graham Pegg
Michael James Watts
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.)
Ford Global Technologies LLC
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Ford Global Technologies LLC
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Publication date
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to GB0719815.3A priority Critical patent/GB2453561B/en
Publication of GB0719815D0 publication Critical patent/GB0719815D0/en
Priority to DE102008039350.9A priority patent/DE102008039350B4/en
Priority to CN2008101659237A priority patent/CN101408121B/en
Priority to JP2008262909A priority patent/JP5324879B2/en
Publication of GB2453561A publication Critical patent/GB2453561A/en
Application granted granted Critical
Publication of GB2453561B publication Critical patent/GB2453561B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • 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
    • B60K6/44—Series-parallel type
    • B60K6/442—Series-parallel switching type
    • 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
    • B60K6/42—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
    • B60K6/44—Series-parallel type
    • B60K6/445—Differential gearing distribution type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • 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
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • 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
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or 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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/192—Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
    • B60W30/194—Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine related to low temperature conditions, e.g. high viscosity of hydraulic fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2300/00—Purposes or special features of road vehicle drive control systems
    • B60Y2300/47—Engine emissions
    • B60Y2300/476—Regeneration of particle filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D2041/026—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus using an external load, e.g. by increasing generator load or by changing the gear ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/11—Oil dilution, i.e. prevention thereof or special controls according thereto
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/405—Multiple injections with post injections
    • 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
    • Y02T10/40—Engine management 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles
    • 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
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    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

A method of regenerating an exhaust aftertreatment device 50 connected to a diesel engine 20 of a hybrid vehicle 5 comprises applying an electrical load in the form of an oil heater 52 to an electric generator 24 driven by the diesel engine 20 during regeneration of the exhaust aftertreatment device 50 in order to increase the temperature of the exhaust gas flowing to the exhaust aftertreatment device 50 and increase the temperature of the oil flowing through the diesel engine 20 so as to allow the use of less late injected fuel to regenerate the exhaust aftertreatment device 50 and reduce the transfer of fuel to the oil. The electrical load may also comprise a battery 28 the charge of which is allowed to fall to a low level before regeneration is required.

Description

A method of regenerating an exhaust aftertreatment device The present invention relates generally to Hybrid Electric Vehicles (HEV5) and in particular to an HEV having a diesel internal combustion engine.
The need to reduce fossil fuel consumption by and emissions from automobiles and other vehicles powered by an Internal Combustion Engine (ICE) is well known. Vehicles powered by electric motors attempt to address these needs.
However, electric vehicles have limited range, limited power capabilities and need substantial time to recharge their batteries. An alternative solution is to combine both an ICE and electric traction motor into one vehicle. Such vehicles are typically called Hybrid Electric Vehicles (HEVs) . An HEV can be arranged in a variety of configurations, some of which require an operator to select between electric and internal combustion operation and others in which the transition between internal combustion engine drive and electric drive is performed automatically.
The most common configurations are:-a/ Series Hybrid Electric Vehicle (SHEV) in which the internal combustion engine is connected to an electric motor called a generator. The generator, in turn, provides electricity to a battery and another motor, called a traction motor. In the SHEV, the traction motor is the sole source of wheel torque. There is no mechanical connection between the engine and the drive wheels; b/ Parallel Hybrid Electrical Vehicle (PHEV) configuration has an internal combustion engine and an electric motor that together provide the necessary wheel torque to drive the vehicle. In the PHEV configuration, the electric motor can be used as a generator to charge the battery from the power produced by the ICE; and c/ Parallel/Series Hybrid Electric Vehicle (PSHEV) because this has the chaLacterjstics of both the PHEV and the SHEV configurations and is typically known as a "powersplit" configuration. In the PSHEV, the internal combustion engine is mechanically coupled to two electric motors via a planetary gearset transaxle. A first electric motor, the generator, is connected to a sun gear, the internal combustion engine is connected to a carrier, a second electric motor in the form of a traction motor is connected to a ring (output) gear via additional gearing in a transaxie. Torque from the internal combustion engine powers the generator to charge the battery. The generator can also contribute to the necessary wheel (output shaft) torque. The traction motor is used to contribute wheel torque and to recover braking energy to charge the battery if a regenerative braking system is used.
The desirability of combining an internal combustion engine with an electric motor is clear, the fuel consumption and emissions from the internal combustion engine are reduced with no appreciable loss of vehicle performance or range.
It is a common feature of all hybrid electric vehicles that the internal combustion engine is stopped whenever possible in order to reduce emissions and fuel consumption and this has the disadvantage that the internal combustion engine is often running below its optimum operating temperature.
This poses a particular problem in the case of a diesel engine because it is common practice for a Diesel engine to inject fuel late in the combustion cycle a process known as post injection in order to regenerate an exhaust aftertreatment device such as a diesel particulate trap, a NOx trap or a catalytic converter. The injection timing of this fuel is chosen such that it occurs so late in the cycle that the fuel does not combust but leaves the cylinder with the exhaust gas and is carried to an exhaust aftertreatment system in order to regenerate it. In some cases, particularly when the exhaust gas temperature is low, there are two post injections of fuel a first arranged such that the fuel combusts partially in the cylinder so as to increase the temperature of the exhaust gas leaving the engine and a second very late in the combustion cycle as described above.
Although post injection is successful in terms of improving the efficiency and operation of the exhaust treatment system, it has the disadvantage of using fuel which would otherwise not be required and so it is desirable to reduce the volume of fuel used in regeneration to a minimum.
It is an object of this invention to provide a method of regenerating an exhaust aftertreatment device of a diesel hybrid electric vehicle with reduced fuel usage.
According to a first aspect of the invention there is provided method of regenerating an exhaust aftertreatment device of a diesel hybrid electric vehicle having a diesel engine drivingly connected to an electric generator, the method comprising the steps of applying an electrical load to the electric generator by switching on an electric oil heater arranged to heat the oil circulating through the diesel engine prior to starting regeneration of the exhaust aftertreatment device so as to increase the temperature of the exhaust gasses from the engine and the temperature of the oil circulating through the diesel engine, regenerating the exhaust aftertreatment device and removing the electrical load from the electric generator by switching off the electric oil heater so as to allow the exhaust gas temperature and the oil temperature to return to normal levels.
Regenerating the exhaust aftertreatment device may comprise initiating late injection of fuel into the diesel engine so as to regenerate the exhaust aftertreatment device when it is determined that regeneration is required and terminating the late injection of fuel when regeneration is determined to be complete.
The electrical load may further comprise a battery and the method may further comprise allowing a state of charge of the battery to fall to a low level when regeneration is known to be required, starting recharging of the battery prior to commencing regeneration of the exhaust aftertreatment device and continuing charging of the battery during regeneration of the aftertreatment device.
The diesel engine may have a variable flow oil pump and the method may further comprise increasing the flow of oil through the diesel engine during regeneration of the exhaust aftertreatment device.
The electric generator may be a generator/motor.
According to a second aspect of the invention there is provided a diesel hybrid electric vehicle having a diesel engine driveably connected to an electric generator, at least one electric load selectively connectable to the electric generator, an exhaust aftertreatment device to process exhaust gas from the diesel engine and a controller to control regeneration of the exhaust aftertreatment device and the application of the electric load to the electric generator wherein the electric load is an electric oil heater used to heat the oil flowing through the diesel engine and the controller is operable to switch on the electric oil heater prior to commencement of regeneration of the aftertreatment device so as to increase the temperature of the oil flowing through the diesel engine and increase the exhaust gas flowing from the diesel engine during regeneration and switch off the electric oil heater when regeneration of the exhaust aftertreatment device is complete in order to allow the temperature of the exhaust gasses passing from the diesel engine to the exhaust aftertreatment device and the temperature of the oil to return to normal levels.
The electric load may further comprise a battery and the controller may be operable to allow a state of charge of the battery to fall to a low level when regeneration is known to be required and use the electric generator to recharge the battery and heat the oil using the oil heater prior to and during regeneration of the aftertreatment device.
The diesel engine may have a variable flow oil pump to circulate oil through the diesel engine and the controller is further operable to increase the flow of oil through the diesel engine during regeneration of the exhaust aftertreatment device.
The electric generator may be a generator/motor.
The invention will now be described by way of example with reference to the accompanying drawing of which:-FIG.l is a schematic representation a Diesel Hybrid Electric Vehicle according to the invention; and Fig.2 is a flowchart showing one embodiment of a method according to the invention.
With reference to FIG. 1 there is shown a diesel hybrid electric vehicle 5 which in this case is of the Parallel/Series Hybrid Electric Vehicle (powerspilt) configuration.
The vehicle 5 has a diesel engine 20 the exhaust flow from which is passed through an exhaust aftertreatment device, which in this case is a diesel particulate trap 50.
A sensor array 51 is provided to supply a number of signals to a controller 36 such as exhaust gas temperature and exhaust gas Constitution. It will be appreciated that further sensors may be located downstream from the diesel particulate trap 50.
An electric oil heater 52 is in this case arranged to selectively heat the oil stored in a sump of the diesel engine 20 but could be located at any convenient located in the oil lubrication circuit of the diesel engine 20.
The electric oil heater 52 is electrically connected to a generator/ motor 24 driven by the diesel engine 20.
A pump (not shown) is used to circulate the oil through the oil lubrication circuit of the diesel engine 20 and is preferable of a type in which the flow is not related to the rotational speed of the diesel engine 20. That is to say, the oil pump is of a variable flow type and the oil flow through the diesel engine 20 is controllable by the controller 36.
A Planetary Gear Set 26 mechanically couples a carrier gear to the diesel engine 20 via a One Way Clutch 44 and also mechanically couples a sun gear to the generator/motor 24 and a ring (output) gear to a traction motor 30.
The generator motor 24 is also mechanically connected to a brake 22 and is electrically linked to a battery 28.
The traction motor 30 is mechanically coupled to the ring gear of the planetary gear set 26 via a second gear set 32 and is electrically linked to the battery 28. The ring :0 gear of the planetary gear set 26 is mechanically coupled to driven wheels 34 of the vehicle 5 via an output shaft 33.
The traction motor 30 can be used to augment the power from the diesel engine 20 to the drive wheels 34 on a parallel path through the second gear set 32.
Overall system control is performed by the controller 36 which is often referred to as a Vehicle System Controller.
The controller 36 operates all main vehicle components by connecting to each component controller and contains in this case a Powertrain Control Module (PCM) although the PCM could be housed in a separate unit.
The controller 36 is connected to the diesel engine 20 via a hardwire interface and is also connected to a battery control unit ("BCU") 38 and a transmission management unit ("TMU") 40 through a Communication Network.
The battery control unit 38 is connected to the battery 28 via hardwire interface and the transmission management unit 40 controls the generator/motor 24 and the traction motor 30 via a hardwire interface.
The controller 36 determines when to run the diesel engine 20 in order to provide tractive effort for the vehicle 5 or in order to drive the generator/ motor 24 in order to recharge the battery 28.
The controller 36 is also operable to receive an indication of when the diesel particulate trap 50 requires regeneration from the sensor array 51 and to perform a method in accordance with this invention, one embodiment of which will now be described with reference to Fig.2.
The method begins at step 100 which is when the engine 11 is started. The step may be referred to as a key on' step.
The method then advances to step 110 where it is determined whether regeneration of the aftertreatment device is required. If regeneration is not required, the method loops around step 110 until regeneration is required at which point the method advances, if a variable flow oil pump is used on the diesel engine 20 then the method advances to step 120 otherwise it advances to step 130.
At step 120 the flowrate of the oil circulating through the diesel engine 20 is increased. Because an electric oil heater 52 is used as an electrical load for the generator/motor 24, increasing the flow of oil through the diesel engine 20 reduces the risk of localised degradation of the oil occurring at the interface with the electric oil heater 52.
At step 130, the controller 36 is operable to switch on an electrical load connected to the generator/motor 24 and in this case the controller 36 is operable to switch on the oil heater 52. The switching on of the oil heater will occur prior to regeneration by a sufficient time interval to permit the temperature of the oil to have risen sufficiently to reduce the transfer of fuel into the oil during regeneration. This pre-heating period for the oil will vary from engine to engine depending upon the volume of oil to be heated and the power consumption of the electrical heater 52 but is in the order of several minutes rather than a few seconds. The early switch on of the electrical load in the form of the oil heater 52 also provides sufficient time for the exhaust gas temperature to rise and heat the aftertreatment device 50.
In addition to the use of the oil heater 52 it will be appreciated that one or more additional electrical loads could be switched on to further increase the load on the diesel engine 20.
For example, the state of charge of the battery 28 could be allowed by the controller 36 via the BCU 38 to be at a low level when it is known that regeneration is required and in this case the recharging of the battery 28 would form an additional electrical load for the generator/motor 24.
Then at step 140 regeneration of the aftertreatment device 50 is started by late or post injecting of fuel into the diesel engine 20. This will continue until it is determined that regeneration is complete and, due to the elevated exhaust gas temperature, less fuel is post injected than would otherwise be the case.
The application of an electrical load during regeneration of the aftertreatrnent device 50 has two advantageous effects firstly, because the electric oil heater 52 consumes a large amount of electrical power and is connected to the generator/motor, the load on the diesel -10 -engine 20 is increased by the requirement for the generation of power by the generator/motor and this increase in load applied to the diesel engine 20 causes the exhaust temperature of the diesel engine to increase thereby reducing the volume of fuel required for regeneration thereby improving overall fuel economy and secondly, because less fuel is required, there is less risk of fuel being transferred to the oil. In addition, the increased oil temperature reduces the volume of fuel transferred to the oil during regeneration of the aftertreatment device 50.
When it is determined that the aftertreatment device 50 has been regenerated, the post injection of fuel is terminated as indicated in step 150.
The temperature of the exhaust gasses is then allowed to return to normal by switching off the electrical load 52 as indicated by step 160.
If a variable flow oil pump is used on the diesel engine 20 then the method advances from step 160 to step 170 where the oil flow rate through the diesel engine 20 is returned to a normal level otherwise the method advances to step 180.
In step 180 it is determined whether the diesel engine is still operating, if the diesel engine 20 is still operating (Key-on =Yes) then the method returns to step 110 but if it is determined that the diesel engine 20 is not operating (Key-on =No) then it advances to step 200 where it ends.
It will be appreciated that the described method is just one example of a method according to this invention and that the invention is not limited to the steps described or to the order in which such steps are executed.
-11 -Therefore in summary, the invention proposes that the temperature of the exhaust gasses from the diesel engine 20 is increased prior to the beginning of a period of post injection and is maintained high for a given period after post injection has ended in order to reduce the consumption of fuel by the diesel engine 20 during regeneration of the aftertreatment device 50 and minimise the transfer of fuel to the oil.
Although the invention has been described with reference to an embodiment in which late or post injection of fuel is used to regenerate the aftertreatment device 50 it will be appreciated that fuel could alternatively be injected directly into the exhaust gasses flowing to the exhaust aftertreatment device 50 or directly into the exhaust aftertreatment device 50 but even in this case the amount of fuel required is reduced.
Although the invention has been described with reference to an embodiment in which a single electrical load in the form of the oil heater 52 is applied to the generator/motor 24 prior to and during regeneration of the exhaust aftertreatment device 50 it will be appreciated that multiple electrical loads including the oil heater 52 could be applied.
It will be appreciated by those skilled in the art that although the invention has been described by way of example with reference to one or more embodiments it is not limited to the disclosed embodiments and that one or more modifications to the disclosed embodiments or alternative embodiments could be constructed without departing from the scope of the invention.

Claims (11)

  1. -12 -Claims 1. A method of regenerating an exhaust aftertreatment device of a diesel hybrid electric vehicle having a diesel engine drivingly connected to an electric generator, the method comprising the steps of applying an electrical load to the electric generator by switching on an electric oil heater arranged to heat the oil circulating through the diesel engine prior to starting regeneration of the exhaust :0 aftertreatment device so as to increase the temperature of the exhaust gasses from the engine and the temperature of the oil circulating through the diesel engine, regenerating the exhaust aftertreatment device and removing the electrical load from the electric generator by switching off the electric oil heater so as to allow the exhaust gas temperature and the oil temperature to return to normal levels.
  2. 2. A method as claimed in claim 1 wherein regenerating the exhaust aftertreatment device comprises initiating late injection of fuel into the diesel engine so as to regenerate the exhaust aftertreatment device when it is determined that regeneration is required and terminating the late injection of fuel when regeneration is determined to be complete.
  3. 3. A method as claimed in claim 1 or in claim 2 wherein the electrical load further comprises a battery and the method further comprises allowing a state of charge of the battery to fall to a low level when regeneration is known to be required, starting recharging of the battery prior to commencing regeneration of the exhaust aftertreatment device and continuing charging of the battery during regeneration of the aftertreatment device.
    -13 -
  4. 4. A method as claimed in any of claims 1 to 3 wherein the diesel engine has a variable flow oil pump and the method further comprises increasing the flow of oil through the diesel engine during regeneration of the exhaust aftertreatment device.
  5. 5. A method as claimed in any of claims 1 to 4 wherein the electric generator is a generator/motor.
  6. 6. A diesel hybrid electric vehicle having a diesel engine driveably connected to an electric generator, at least one electric load selectively connectable to the electric generator, an exhaust aftertreatment device to process exhaust gas from the diesel engine and a controller to control regeneration of the exhaust aftertreatment device and the application of the electric load to the electric generator wherein the electric load is an electric oil heater used to heat the oil flowing through the diesel engine and the controller is operable to switch on the electric oil heater prior to commencement of regeneration of the aftertreatment device so as to increase the temperature of the oil flowing through the diesel engine and increase the exhaust gas flowing from the diesel engine during regeneration and switch off the electric oil heater when regeneration of the exhaust aftertreatment device is complete in order to allow the temperature of the exhaust gasses passing from the diesel engine to the exhaust aftertreatment device and the temperature of the oil to return to normal levels.
  7. 7. A diesel hybrid electric vehicle as claimed in claim 6 wherein the electric load further comprises a battery and the controller is operable to allow a state of charge of the battery to fall to a low level when regeneration is known to be required and use the electric generator to recharge the battery and heat the oil using the -14 -oil heater prior to and during regeneration of the aftertreatment device.
  8. 8. A diesel hybrid electric vehicle as claimed in claim 6 or in claim 7 wherein the diesel engine has a variable flow oil pump to circulate oil through the diesel engine and the controller is further operable to increase the flow of oil through the diesel engine during regeneration of the exhaust aftertreatment device.
  9. 9. A diesel hybrid electric vehicle as claimed in any of claims 6 to 8 wherein the electric generator is a generator/motor.
  10. 10. A method of regenerating an exhaust aftertreatment device of a diesel hybrid electric vehicle having a diesel engine drivingly connected to an electric generator substantially as described herein with reference to the accompanying drawing.
  11. 11. A diesel hybrid electric vehicle substantially as described herein with reference to the accompanying drawing.
GB0719815.3A 2007-10-11 2007-10-11 A method of regenerating an exhaust aftertreatment device Expired - Fee Related GB2453561B (en)

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GB0719815.3A GB2453561B (en) 2007-10-11 2007-10-11 A method of regenerating an exhaust aftertreatment device
DE102008039350.9A DE102008039350B4 (en) 2007-10-11 2008-08-22 Method for regenerating an exhaust aftertreatment device
CN2008101659237A CN101408121B (en) 2007-10-11 2008-09-24 Regenerating method and device for exhaust gas aftertreatment device
JP2008262909A JP5324879B2 (en) 2007-10-11 2008-10-09 Regeneration method of exhaust aftertreatment device for automobile having diesel engine, and automobile having diesel engine equipped with exhaust aftertreatment apparatus

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JP5324879B2 (en) 2013-10-23
JP2009090977A (en) 2009-04-30
CN101408121A (en) 2009-04-15
CN101408121B (en) 2012-07-04

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