US20160153329A1 - Particulate filter regeneration method of diesel hybrid vehicle - Google Patents
Particulate filter regeneration method of diesel hybrid vehicle Download PDFInfo
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- US20160153329A1 US20160153329A1 US14/798,848 US201514798848A US2016153329A1 US 20160153329 A1 US20160153329 A1 US 20160153329A1 US 201514798848 A US201514798848 A US 201514798848A US 2016153329 A1 US2016153329 A1 US 2016153329A1
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- engine
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- particulate filter
- motor
- exhaust gas
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- 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
- F01N3/027—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 using electric or magnetic heating means
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
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- 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
- B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
- B60K6/52—Driving a plurality of drive axles, e.g. four-wheel drive
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- 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
- B60W20/16—Control strategies specially adapted for achieving a particular effect for reducing engine exhaust emissions
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- 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
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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
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
- B60K17/356—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B60K2006/4825—Electric machine connected or connectable to gearbox input shaft
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- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/068—Engine exhaust temperature
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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
- B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
- B60W2530/12—Catalyst or filter state
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- 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
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- F02D41/021—Introducing corrections for particular conditions exterior to the engine
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F02D41/38—Controlling fuel injection of the high pressure type
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- F02D41/403—Multiple injections with pilot injections
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- 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
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Definitions
- the present invention relates to a method of regenerating a particulate filter of a diesel hybrid vehicle which can reduce fuel consumption using a diesel engine and a driving motor and can reduce environmental pollution by decreasing a discharge amount of particulate matter in exhaust gas.
- the passive type there are a type of using an oxidation catalyst filter which burns particulate matter after reducing a generation temperature of the particulate matter by mixing a metal such as iron (Fe), cerium (Ce), copper (Cu), and platinum (Pt) with a fuel, or coating a filter with a precious metal, and a type using a particulate filter which directly filters particulate matter.
- a metal such as iron (Fe), cerium (Ce), copper (Cu), and platinum (Pt)
- the type using a particulate filter collects particulate matter and then directly burns it or heats it up to a temperature where it can be burned. Further, in a common rail type of diesel engine, fuel is sprayed and burned in the latter portion of the exhaust process, thereby increasing the exhaust gas temperature and accordingly burning the collected particulate matter.
- Various aspects of the present invention are directed to providing a method of regenerating a particulate filter in a diesel hybrid vehicle which increases the temperature of an exhaust gas to regenerate a diesel particulate filter, but is capable of reducing fuel consumption and saving an operation cost by recovering it.
- An exemplary embodiment of the present invention provides a method of regenerating a particulate filter of a diesel hybrid vehicle which includes: determining whether a regeneration condition for a particulate filter that filters particulate matter in an exhaust gas discharged from an engine is satisfied; entering a mode for increasing the temperature of the exhaust gas when the regeneration condition is satisfied; increasing output torque of the engine to increase the temperature of the exhaust gas; calculating redundant torque by subtracting demand torque from the increased output torque of the engine; generating electricity by means of a motor by using the redundant torque; and storing the electricity generated by the motor in a battery.
- a main injection amount of the injector may be increased to increase the output torque.
- the motor may be an HSG (Hybrid Starter and Generator) that starts the engine or generates electricity using torque from the engine.
- HSG Hybrid Starter and Generator
- the motor may be a driving motor that transmits torque to driving wheels, together with the engine.
- the electricity generated by the motor may be stored in the battery.
- the regeneration condition for the particulate filter may be determined on the basis of a front-rear pressure difference of the particulate filter or a driving distance.
- the engine may rotate front wheels and the motor may rotate rear wheels.
- the engine may be connected with the motor through an engine clutch and the motor may rotate front wheels through a transmission.
- the method may further include performing post-injection if the temperature of the exhaust gas does not reach a predetermined level.
- a diesel hybrid vehicle may include a controller for performing the method of regenerating a particulate filter of a diesel hybrid vehicle.
- the redundant torque between the increased output torque and the demand torque is recovered as electrical energy through an HSG or a driving motor and stored in a battery, so it is possible to easily reduce fuel consumption.
- the main injection is increased to regenerate the diesel particulate filter, but when the temperature of the exhaust gas does not reach a predetermined temperature, the temperature of the exhaust gas can be stably corrected by controlling post-injection of the injector.
- FIG. 1 is a graph showing characteristics of fuel injection of an injector in a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- FIG. 2 is a graph showing operation characteristics of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- FIG. 3 is a schematic diagram showing the configuration of an engine of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- FIG. 4 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- FIG. 5 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- FIG. 6 is a flowchart illustrating a method of regenerating a particulate filter of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- FIG. 1 is a graph showing characteristics of fuel injection of an injector in a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- the horizontal axis is a rotational angle (time) of the crankshaft of an engine 315 and the vertical axis shows the characteristic of the amount of fuel injected from an injector 300 .
- the injector 300 sequentially injects fuel at predetermined times, and the injection includes first pilot injection 100 , second pilot injection 105 , main injection 110 , first post-injection 115 , and second post-injection 120 .
- the main injection 110 actually contributes to output torque, and the pilot injection and the post-injection reduce vibration noise and control the characteristic (e.g., temperature) of exhaust gas while contributing little to the output torque.
- the characteristic e.g., temperature
- the output torque and the temperature of an exhaust gas may both be increased.
- FIG. 2 is a graph showing operation characteristics of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- the horizontal axis shows a rotational speed of an engine 315 and the vertical axis shows BMEP of the engine 315 .
- the current BMEP (about 8) is optionally increased to a setting value (about 12 ), thereby increasing load or output (torque) of the engine 315 .
- This state may be applied to idling of the engine 315 or a rotational sped higher than an idle rotational speed, but when torque or load increases, the RPM of the engine is maintained at the level or is not specifically corrected.
- the main injection amount of the injector 300 is increased to increase the BMEP, redundant torque between increased output torque and demand torque is calculated, and a hybrid starter and generator (HSG) 500 or a driving motor 520 generates electricity by using the redundant torque.
- the electricity generated by the HSG 500 or the driving motor 520 is stored in a battery 490 through an inverter.
- FIG. 3 is a schematic diagram showing the configuration of an engine of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- an engine system includes an engine 315 , an intake line 302 , an intercooler 310 , an injector 300 , an exhaust line 320 , a diesel particulate filter 305 , a low-pressure EGR line 350 , a low-pressure EGR cooler 355 , a high-pressure EGR line 340 , a high-pressure EGR cooler 345 , and a turbocharger 330 , in which the turbocharger 330 includes a turbine 332 and a compressor 334 .
- the compressor 334 of the turbocharger 330 compresses the air
- the intercooler 310 cools high-temperature compressed air
- the injector 300 injects fuel into a combustion chamber
- the injected fuel is mixed and burned with air
- an exhaust gas is discharged through the exhaust line 320 .
- the diesel particulate filter 305 collects particulate matter contained in the exhaust gas and removes the collected particulate matter by burning it under a predetermined high-temperature condition. Further, the turbine 332 disposed in the exhaust line 320 is rotated by the exhaust gas and operates the compressor 334 .
- the diesel particulate filter 305 is equipped with a front-rear differential gear device pressure sensor, so it can detect a front-rear pressure difference and the diesel particulate filter can be regenerated on the basis of the detected pressure difference or an operational condition of the engine, that is, a driving distance.
- the low-pressure EGR line 350 is divided at the downstream side from the diesel particulate filter 305 and connects with the upstream side from the compressor 334 , while the high-pressure EGR line 340 is divided at the upstream side from the turbine 332 and connects with the downstream side from the intercooler 310 .
- a low-pressure EGR valve and a high-pressure EGR valve are disposed in the low-pressure EGR line 350 and the high-pressure EGR line 340 , respectively, so they can control a recycling exhaust gas.
- FIG. 4 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- a diesel hybrid vehicle includes an HSG 500 , an engine 315 , an injector 300 , a diesel particulate filter 305 , an engine clutch 510 , a transmission 530 , a front differential gear device 540 , a driving motor 520 , a rear differential gear device 400 , a battery 490 , and a controller 550 .
- the controller 550 may be achieved by one or more microprocessors that are operated by a predetermined program, and the predetermined program may include a series of commands for performing a method according to an exemplary embodiment of the present invention.
- the HSG 500 is coupled to the engine 315 and starts the engine 315 through a belt or a gear or generates electricity using torque from the engine 315 , and the battery 490 is charged with the electricity through an inverter.
- the engine 315 generates torque using fuel injected from the injector 300 , and the burned exhaust gas is discharged outside through the diesel particulate filter 305 .
- the engine clutch 510 , the transmission 530 , the front differential gear device 540 , and front wheels are sequentially mounted on an output shaft of the engine 315 , and the torque from the engine 315 is transmitted to the front wheels through the engine clutch 510 , the transmission 530 , and the front differential gear device 540 .
- the engine clutch 510 selectively transmits the torque from the engine 315 to the transmission 530 , the transmission 530 controls a gear ratio, and the front differential gear device 540 distributes torque to the left and right wheels.
- the driving motor 520 is disposed to rotate rear wheels through the rear differential gear device 400 . Further, in regenerative braking, the driving motor 520 generates electricity using torque transmitted from the rear wheels and the generated electricity is stored in the battery 490 through the inverter.
- the controller 550 controls the engine 315 , the injector 300 , the HSG 500 , the engine clutch 510 , the transmission 530 , the driving motor 520 , the inverter, and the battery 490 so that the diesel hybrid vehicle normally operates.
- FIG. 5 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- a diesel hybrid vehicle includes an HSG 500 , an engine 315 , an injector 300 , a diesel particulate filter 305 , an engine clutch 510 , a driving motor 520 , a transmission 530 , a front differential gear device 540 , front wheels, a battery 490 , and a controller 550
- the HSG 500 is coupled to the engine 315 and starts the engine 315 through a belt or a gear or generates electricity using torque from the engine 315 , and the battery 490 is charged with the electricity through an inverter.
- the engine 315 generates torque using fuel injected from the injector 300 , and the burned exhaust gas is discharged outside through the diesel particulate filter 305 .
- the engine clutch 510 , the driving motor 520 , the transmission 530 , the front differential gear device 540 , and the front wheels are sequentially mounted on an output shaft of the engine 315 , and the torque from the engine 315 is transmitted to the front wheels through the engine clutch 510 , the driving motor 520 , the transmission 530 , and the front differential gear device 540 .
- the engine clutch 510 transmits torque from the engine 315 to the driving motor 520 , the driving motor 520 adds its torque and transmits it to the transmission 530 , the transmission 530 controls a gear ratio, and the front differential gear device 540 distributes the torque to the left and right wheels.
- the driving motor 520 supplements the torque from the engine 315 or may rotate the front wheels through the transmission 530 without the torque from the engine 315 .
- the controller 550 controls the engine 315 , the injector 300 , the HSG 500 , the engine clutch 510 , the transmission 530 , the driving motor 520 , the inverter, and the battery 490 so that the diesel hybrid vehicle normally operates.
- FIG. 6 is a flowchart illustrating a method of regenerating a particulate filter of a diesel hybrid vehicle according to an exemplary embodiment of the present invention.
- the controller 550 determines whether a regeneration condition is satisfied in step S 600 .
- the regeneration condition may be satisfied when the front-rear pressure difference of the diesel particulate filter 305 is greater than or equal to a predetermined pressure.
- the regeneration condition may be satisfied when the driving distance of the diesel hybrid vehicle becomes a predetermined distance.
- the controller 550 enters a mode for increasing the temperature of an exhaust gas to remove particulate matter collected by the diesel particulate filter 305 in step S 610 .
- the controller 550 executes a mode for increasing the output torque of the engine 315 in step S 620 and the main injection amount of the injector 300 is increased in step S 630 .
- step S 640 a redundant torque is calculated by subtracting demand torque from the increased output torque of the engine 315 .
- step S 650 the HSG 500 or the driving motor 520 generates electricity using the redundant torque and the generated electricity is stored in the battery 490 through the inverter.
- step S 660 if the temperature of the exhaust gas does not reach a predetermined level, the temperature of the exhaust gas is corrected, in which the injector 300 may be made perform post-injection. Finally, in step S 670 , the diesel particulate filter 305 is regenerated and the controller 550 returns to a normal mode.
Abstract
A method of regenerating a particulate filter of a diesel hybrid vehicle includes determining whether a regeneration condition for a particulate filter that filters particulate matter in an exhaust gas discharged from an engine may be satisfied, entering a mode for increasing the temperature of the exhaust gas when the regeneration condition may be satisfied, increasing output torque of the engine to increase the temperature of the exhaust gas, determining redundant torque by subtracting demand torque from the increased output torque of the engine, generating electricity by a motor by using the redundant torque, and storing the electricity generated by the motor in a battery.
Description
- The present application claims priority to and the benefit of Korean Patent Application No. 10-2014-0170351 filed on Dec. 2, 2014, the entire contents of which is incorporated herein for all purposes by this reference.
- 1. Field of the Invention
- The present invention relates to a method of regenerating a particulate filter of a diesel hybrid vehicle which can reduce fuel consumption using a diesel engine and a driving motor and can reduce environmental pollution by decreasing a discharge amount of particulate matter in exhaust gas.
- 2. Description of Related Art
- In general, as methods of regenerating diesel particulate matter, there are a passive type that uses only exhaust gas for regeneration without a specific heat source and a forcible type that burns particulate matter by forcibly supplying a chemical heat source.
- As for the passive type, there are a type of using an oxidation catalyst filter which burns particulate matter after reducing a generation temperature of the particulate matter by mixing a metal such as iron (Fe), cerium (Ce), copper (Cu), and platinum (Pt) with a fuel, or coating a filter with a precious metal, and a type using a particulate filter which directly filters particulate matter.
- The type using a particulate filter collects particulate matter and then directly burns it or heats it up to a temperature where it can be burned. Further, in a common rail type of diesel engine, fuel is sprayed and burned in the latter portion of the exhaust process, thereby increasing the exhaust gas temperature and accordingly burning the collected particulate matter.
- Recently, a diesel hybrid vehicle equipped with a driving motor combined with a diesel engine has been studied and developed, in which the driving motor supports the engine using electrical energy stored in a battery or only the driving motor is used for driving, so fuel consumption can be considerably reduced.
- Meanwhile, a process of increasing the temperature of an exhaust gas is performed to regenerate a particulate filter in the diesel hybrid vehicle, but when post-injection is performed in order to increase the temperature of an exhaust gas, as described above, there is little change in output and fuel consumption increases instead.
- The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
- Various aspects of the present invention are directed to providing a method of regenerating a particulate filter in a diesel hybrid vehicle which increases the temperature of an exhaust gas to regenerate a diesel particulate filter, but is capable of reducing fuel consumption and saving an operation cost by recovering it.
- An exemplary embodiment of the present invention provides a method of regenerating a particulate filter of a diesel hybrid vehicle which includes: determining whether a regeneration condition for a particulate filter that filters particulate matter in an exhaust gas discharged from an engine is satisfied; entering a mode for increasing the temperature of the exhaust gas when the regeneration condition is satisfied; increasing output torque of the engine to increase the temperature of the exhaust gas; calculating redundant torque by subtracting demand torque from the increased output torque of the engine; generating electricity by means of a motor by using the redundant torque; and storing the electricity generated by the motor in a battery.
- A main injection amount of the injector may be increased to increase the output torque.
- The motor may be an HSG (Hybrid Starter and Generator) that starts the engine or generates electricity using torque from the engine.
- The motor may be a driving motor that transmits torque to driving wheels, together with the engine.
- The electricity generated by the motor may be stored in the battery.
- The regeneration condition for the particulate filter may be determined on the basis of a front-rear pressure difference of the particulate filter or a driving distance.
- The engine may rotate front wheels and the motor may rotate rear wheels.
- The engine may be connected with the motor through an engine clutch and the motor may rotate front wheels through a transmission.
- The method may further include performing post-injection if the temperature of the exhaust gas does not reach a predetermined level.
- A diesel hybrid vehicle according to an exemplary embodiment of the present invention may include a controller for performing the method of regenerating a particulate filter of a diesel hybrid vehicle.
- In order to achieve the object, when the regeneration condition for a diesel particulate filter is satisfied under a normal operation condition, it is possible to increase output torque of an engine and regenerate the diesel particulate filter by increasing the temperature of the exhaust gas, by increasing the main injection amount.
- Further, the redundant torque between the increased output torque and the demand torque is recovered as electrical energy through an HSG or a driving motor and stored in a battery, so it is possible to easily reduce fuel consumption.
- Further, the main injection is increased to regenerate the diesel particulate filter, but when the temperature of the exhaust gas does not reach a predetermined temperature, the temperature of the exhaust gas can be stably corrected by controlling post-injection of the injector.
- The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention.
-
FIG. 1 is a graph showing characteristics of fuel injection of an injector in a diesel hybrid vehicle according to an exemplary embodiment of the present invention. -
FIG. 2 is a graph showing operation characteristics of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. -
FIG. 3 is a schematic diagram showing the configuration of an engine of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. -
FIG. 4 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. -
FIG. 5 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. -
FIG. 6 is a flowchart illustrating a method of regenerating a particulate filter of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.
- In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.
- Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that the present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
- An exemplary embodiment of the present invention will hereinafter be described in detail with reference to the accompanying drawings.
-
FIG. 1 is a graph showing characteristics of fuel injection of an injector in a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - Referring to
FIG. 1 , the horizontal axis is a rotational angle (time) of the crankshaft of anengine 315 and the vertical axis shows the characteristic of the amount of fuel injected from aninjector 300. - As shown in the figure, the
injector 300 sequentially injects fuel at predetermined times, and the injection includesfirst pilot injection 100,second pilot injection 105,main injection 110,first post-injection 115, andsecond post-injection 120. - The
main injection 110 actually contributes to output torque, and the pilot injection and the post-injection reduce vibration noise and control the characteristic (e.g., temperature) of exhaust gas while contributing little to the output torque. However, when a large amount of fuel is injected in themain injection 110, the output torque and the temperature of an exhaust gas may both be increased. -
FIG. 2 is a graph showing operation characteristics of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - Referring to
FIG. 2 , the horizontal axis shows a rotational speed of anengine 315 and the vertical axis shows BMEP of theengine 315. In an exemplary embodiment of the present invention, when a regeneration condition for a diesel particulate filter (DPF) 305 is satisfied, the current BMEP (about 8) is optionally increased to a setting value (about 12), thereby increasing load or output (torque) of theengine 315. - This state may be applied to idling of the
engine 315 or a rotational sped higher than an idle rotational speed, but when torque or load increases, the RPM of the engine is maintained at the level or is not specifically corrected. - In an exemplary embodiment of the present invention, the main injection amount of the
injector 300 is increased to increase the BMEP, redundant torque between increased output torque and demand torque is calculated, and a hybrid starter and generator (HSG) 500 or adriving motor 520 generates electricity by using the redundant torque. The electricity generated by the HSG 500 or thedriving motor 520 is stored in abattery 490 through an inverter. -
FIG. 3 is a schematic diagram showing the configuration of an engine of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - Referring to
FIG. 3 , an engine system includes anengine 315, anintake line 302, anintercooler 310, aninjector 300, anexhaust line 320, adiesel particulate filter 305, a low-pressure EGRline 350, a low-pressure EGR cooler 355, a high-pressure EGRline 340, a high-pressure EGR cooler 345, and aturbocharger 330, in which theturbocharger 330 includes aturbine 332 and acompressor 334. - External air is taken inside through the
intake line 302, thecompressor 334 of theturbocharger 330 compresses the air, theintercooler 310 cools high-temperature compressed air, theinjector 300 injects fuel into a combustion chamber, the injected fuel is mixed and burned with air, and an exhaust gas is discharged through theexhaust line 320. - The
diesel particulate filter 305 collects particulate matter contained in the exhaust gas and removes the collected particulate matter by burning it under a predetermined high-temperature condition. Further, theturbine 332 disposed in theexhaust line 320 is rotated by the exhaust gas and operates thecompressor 334. - The
diesel particulate filter 305 is equipped with a front-rear differential gear device pressure sensor, so it can detect a front-rear pressure difference and the diesel particulate filter can be regenerated on the basis of the detected pressure difference or an operational condition of the engine, that is, a driving distance. - The low-pressure EGR
line 350 is divided at the downstream side from thediesel particulate filter 305 and connects with the upstream side from thecompressor 334, while the high-pressure EGR line 340 is divided at the upstream side from theturbine 332 and connects with the downstream side from theintercooler 310. - A low-pressure EGR valve and a high-pressure EGR valve are disposed in the low-
pressure EGR line 350 and the high-pressure EGR line 340, respectively, so they can control a recycling exhaust gas. -
FIG. 4 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - Referring to
FIG. 4 , a diesel hybrid vehicle includes anHSG 500, anengine 315, aninjector 300, adiesel particulate filter 305, anengine clutch 510, atransmission 530, a frontdifferential gear device 540, a drivingmotor 520, a reardifferential gear device 400, abattery 490, and acontroller 550. - In an exemplary embodiment of the present invention, the
controller 550 may be achieved by one or more microprocessors that are operated by a predetermined program, and the predetermined program may include a series of commands for performing a method according to an exemplary embodiment of the present invention. - The
HSG 500 is coupled to theengine 315 and starts theengine 315 through a belt or a gear or generates electricity using torque from theengine 315, and thebattery 490 is charged with the electricity through an inverter. - The
engine 315 generates torque using fuel injected from theinjector 300, and the burned exhaust gas is discharged outside through thediesel particulate filter 305. - The
engine clutch 510, thetransmission 530, the frontdifferential gear device 540, and front wheels are sequentially mounted on an output shaft of theengine 315, and the torque from theengine 315 is transmitted to the front wheels through theengine clutch 510, thetransmission 530, and the frontdifferential gear device 540. - The
engine clutch 510 selectively transmits the torque from theengine 315 to thetransmission 530, thetransmission 530 controls a gear ratio, and the frontdifferential gear device 540 distributes torque to the left and right wheels. - Separate from the
engine 315, the drivingmotor 520 is disposed to rotate rear wheels through the reardifferential gear device 400. Further, in regenerative braking, the drivingmotor 520 generates electricity using torque transmitted from the rear wheels and the generated electricity is stored in thebattery 490 through the inverter. - The
controller 550 controls theengine 315, theinjector 300, theHSG 500, theengine clutch 510, thetransmission 530, the drivingmotor 520, the inverter, and thebattery 490 so that the diesel hybrid vehicle normally operates. -
FIG. 5 is a schematic diagram showing the configuration of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - Referring to
FIG. 5 , a diesel hybrid vehicle includes anHSG 500, anengine 315, aninjector 300, adiesel particulate filter 305, anengine clutch 510, a drivingmotor 520, atransmission 530, a frontdifferential gear device 540, front wheels, abattery 490, and acontroller 550 - The
HSG 500 is coupled to theengine 315 and starts theengine 315 through a belt or a gear or generates electricity using torque from theengine 315, and thebattery 490 is charged with the electricity through an inverter. - The
engine 315 generates torque using fuel injected from theinjector 300, and the burned exhaust gas is discharged outside through thediesel particulate filter 305. - The
engine clutch 510, the drivingmotor 520, thetransmission 530, the frontdifferential gear device 540, and the front wheels are sequentially mounted on an output shaft of theengine 315, and the torque from theengine 315 is transmitted to the front wheels through theengine clutch 510, the drivingmotor 520, thetransmission 530, and the frontdifferential gear device 540. - The
engine clutch 510 transmits torque from theengine 315 to the drivingmotor 520, the drivingmotor 520 adds its torque and transmits it to thetransmission 530, thetransmission 530 controls a gear ratio, and the frontdifferential gear device 540 distributes the torque to the left and right wheels. - The driving
motor 520 supplements the torque from theengine 315 or may rotate the front wheels through thetransmission 530 without the torque from theengine 315. - The
controller 550 controls theengine 315, theinjector 300, theHSG 500, theengine clutch 510, thetransmission 530, the drivingmotor 520, the inverter, and thebattery 490 so that the diesel hybrid vehicle normally operates. -
FIG. 6 is a flowchart illustrating a method of regenerating a particulate filter of a diesel hybrid vehicle according to an exemplary embodiment of the present invention. - Referring to
FIG. 6 , thecontroller 550 determines whether a regeneration condition is satisfied in step S600. The regeneration condition may be satisfied when the front-rear pressure difference of thediesel particulate filter 305 is greater than or equal to a predetermined pressure. In addition, the regeneration condition may be satisfied when the driving distance of the diesel hybrid vehicle becomes a predetermined distance. Thecontroller 550 enters a mode for increasing the temperature of an exhaust gas to remove particulate matter collected by thediesel particulate filter 305 in step S610. - The
controller 550 executes a mode for increasing the output torque of theengine 315 in step S620 and the main injection amount of theinjector 300 is increased in step S630. In step S640, a redundant torque is calculated by subtracting demand torque from the increased output torque of theengine 315. - In step S650, the
HSG 500 or the drivingmotor 520 generates electricity using the redundant torque and the generated electricity is stored in thebattery 490 through the inverter. - Further, in step S660, if the temperature of the exhaust gas does not reach a predetermined level, the temperature of the exhaust gas is corrected, in which the
injector 300 may be made perform post-injection. Finally, in step S670, thediesel particulate filter 305 is regenerated and thecontroller 550 returns to a normal mode. - The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.
Claims (10)
1. A method of regenerating a particulate filter of a diesel hybrid vehicle, comprising:
determining whether a regeneration condition for the particulate filter that filters particulate matter in an exhaust gas discharged from an engine is satisfied;
entering a mode for increasing a temperature of the exhaust gas when the regeneration condition is satisfied;
increasing output torque of the engine to increase the temperature of the exhaust gas;
determining a redundant torque by subtracting a demand torque from the increased output torque of the engine;
generating electricity by a motor by using the determined redundant torque; and
storing the electricity generated by the motor in a battery.
2. The method of claim 1 , wherein a main injection amount of an injector is configured to be increased to increase the output torque.
3. The method of claim 1 , wherein the motor is a Hybrid Starter and Generator (HSG) that starts the engine or generates the electricity using torque from the engine.
4. The method of claim 1 , wherein the motor is a driving motor that transmits torque to driving wheels, together with the engine.
5. The method of claim 1 , wherein the regeneration condition for the particulate filter is determined on a basis of a front-rear pressure difference of the particulate filter or a driving distance.
6. The method of claim 4 , wherein the engine rotates front wheels and the motor rotates rear wheels.
7. The method of claim 4 , wherein the engine is connected with the motor through an engine clutch and the motor rotates front wheels through a transmission.
8. The method of claim 1 , further comprising performing post-injection when the temperature of the exhaust gas does not reach a predetermined level.
9. The method of claim 1 , wherein, in the increasing the output torque of the engine, RPM of the engine is not corrected.
10. A diesel hybrid vehicle comprising a controller for performing the method of claim 1 .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR10-2014-0170351 | 2014-12-02 | ||
KR1020140170351A KR20160066243A (en) | 2014-12-02 | 2014-12-02 | Particulate filter regeneration method of diesel hybrid vehicle |
Publications (1)
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US20160153329A1 true US20160153329A1 (en) | 2016-06-02 |
Family
ID=55968380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/798,848 Abandoned US20160153329A1 (en) | 2014-12-02 | 2015-07-14 | Particulate filter regeneration method of diesel hybrid vehicle |
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US (1) | US20160153329A1 (en) |
KR (1) | KR20160066243A (en) |
CN (1) | CN105649718A (en) |
DE (1) | DE102015111132A1 (en) |
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FR3077341A1 (en) * | 2018-01-26 | 2019-08-02 | Psa Automobiles Sa | SYSTEM AND METHOD FOR CONTROLLING THE REGENERATION OF A VEHICLE PARTICLE FILTER, AND A MOTOR VEHICLE INCORPORATING THE SAME |
US20200307547A1 (en) * | 2019-03-29 | 2020-10-01 | Toyota Jidosha Kabushiki Kaisha | Hybrid vehicle |
US20230066607A1 (en) * | 2021-09-01 | 2023-03-02 | Hyundai Motor Company | Hybrid electric vehicle and method of operating engine of the same |
US11708063B2 (en) * | 2021-09-01 | 2023-07-25 | Hyundai Motor Company | Hybrid electric vehicle and method of operating engine of the same |
Also Published As
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DE102015111132A1 (en) | 2016-06-02 |
KR20160066243A (en) | 2016-06-10 |
CN105649718A (en) | 2016-06-08 |
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