JP7276121B2 - 車両制御装置 - Google Patents
車両制御装置 Download PDFInfo
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- JP7276121B2 JP7276121B2 JP2019234630A JP2019234630A JP7276121B2 JP 7276121 B2 JP7276121 B2 JP 7276121B2 JP 2019234630 A JP2019234630 A JP 2019234630A JP 2019234630 A JP2019234630 A JP 2019234630A JP 7276121 B2 JP7276121 B2 JP 7276121B2
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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
- B60W20/15—Control strategies specially adapted for achieving a particular effect
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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
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/28—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the electric energy storing means, e.g. batteries or capacitors
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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
- B60K6/44—Series-parallel type
- B60K6/445—Differential gearing distribution type
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- 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
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
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- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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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
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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
- 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
- B60W20/12—Controlling the power contribution of each of the prime movers to meet required power demand using control strategies taking into account route information
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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
- B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
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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
- 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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/188—Controlling power parameters of the driveline, e.g. determining the required power
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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
- 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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/188—Controlling power parameters of the driveline, e.g. determining the required power
- B60W30/1882—Controlling power parameters of the driveline, e.g. determining the required power characterised by the working point of the engine, e.g. by using engine output chart
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
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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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Description
ハイブリッド車両の走行モードは、内燃機関の駆動力を用いずに、蓄電装置の電力で電動駆動装置を駆動してハイブリッド車両を走行させるEV走行モードと、エンジン発電を行いつつ電動駆動装置及び内燃機関の少なくとも一方の駆動力によってハイブリッド車両を走行させるHV走行モードと、を含む。
車両制御装置は、
内燃機関の温度が排気再循環の開始を許可する温度閾値未満である冷間条件においてハイブリッド車両の始動が行われた際に、始動の後に内燃機関の温度が温度閾値に到達してからの温間条件における車両走行区間の平均車両駆動パワーを走行経路情報に基づいて算出し、
算出した平均車両駆動パワーが高い場合には、それが低い場合と比べて冷間条件におけるエンジン発電の発電量を小さく制限し、かつ、温間条件への移行後のHV走行モードの実行中に、エンジン熱効率を向上させるEGR率を用いた排気再循環を伴うエンジン発電を実行する。
温間条件における車両走行区間の平均車両駆動パワーは、出発地から目的地までの全走行経路情報から冷間条件における車両走行区間に関する情報を除外して得られる温間条件における車両走行区間の走行経路情報に基づいて算出される。
図1~図4を参照して、本発明の実施の形態1について説明する。
図1は、実施の形態1に係る車両制御装置50によって制御されるハイブリッド車両1のパワートレーンシステムの構成を示す模式図である。図1に示すハイブリッド車両1は、一例として、動力分割式である。ハイブリッド車両1は、内燃機関10と、第1モータジェネレータ30(MG1)と、第2モータジェネレータ32(MG2)と、動力分割機構34と、減速機構36、バッテリ38と、車両制御装置50とを備えている。
図1に示すハイブリッド車両1のパワートレーンシステムにおける走行モード、排気再循環(EGR)及びエンジン暖機運転について説明する。
ハイブリッド車両1の走行モードは、「EV走行モード」と「HV走行モード」とを含む。EV走行モードは、内燃機関10の駆動力を用いずに、バッテリ38の電力で第2MG32を駆動してハイブリッド車両1を走行させるモードである。一方、HV走行モードは、エンジン発電を行いつつ内燃機関10及び第2MG32の双方の駆動力によってハイブリッド車両1を走行させるモードである。
HV走行モードでは、ECU52は、運転者からの車両駆動パワーPv[kW]の要求値である車両要求パワーPvrを算出する。車両要求パワーPvrの算出は、典型的にはアクセル開度Accと車速Vとに基づいて行われる。そして、ECU52は、算出した車両要求パワーPvrからバッテリ38の充放電要求パワーPbrを減じることにより、エンジン要求パワーPer(=Pvr-Pbr)を算出する。ここでは、充放電要求パワーPbrは、バッテリ38の放電時に正となり、充電時に負となるものとする。したがって、バッテリ38の充電要求がある場合には、車両要求パワーPvrに対して充放電要求パワーPbrの絶対値を加えて得られた値がエンジン要求パワーPerとなる。
既述したように、PCU54は、第1MG30によって生成された電力を、バッテリ38を介さずに第2MG32に供給できる。そこで、HV走行モードの実行中に実SOCが目標制御範囲RSOC内に収まっている場合(バッテリ38の充電要求がない場合)には、ECU52は、エンジン発電を用いて第1MG30によって生成された電力がバッテリ38を介さずに第2MG32に供給されるようにPCU54を制御する。その結果、内燃機関10が第1MG30と車輪40を駆動しながら、第2MG32が第1MG30から直接的に供給される電力を用いて車輪40を駆動する。これにより、第1MG30が生成した電力をバッテリ38に供給しながらバッテリ38から第2MG32に電力を供給する例と比べて、バッテリ38の充放電による電気損失を低減(回避)しつつHV走行モードを実行できる。なお、急加速時には、高い動力性能の発揮のために、第1MG30からの電力に加えてバッテリ38からの電力を第2MG32に供給しながらHV走行モードが実行される。
EV走行モードでは、第2MG32は、バッテリ38から供給される電力を用いて車輪40を駆動する。ECU52は、車両要求トルクTvrを実現するトルクTmが第2MG32から出力されるようにPCU54を制御する。
ECU52は、エンジン運転中にEGR装置22を用いて排気再循環(EGR)を行うことができる。具体的には、ECU52は、エンジン水温Twが所定の温度閾値THtw(EGRの開始許可温度)未満である冷間条件CC(換言すると、エンジン未暖機状態)ではEGRの実行を禁止する。一方、ECU52は、エンジン水温Twが温度閾値THtw以上である温間条件HC(換言すると、エンジン暖機完了後)ではEGRの実行を許可する。したがって、冷間条件CCでエンジン始動(冷間始動)が行われた場合には、エンジン水温Twが温度閾値THtwに到達した後(エンジン暖機後)に、他のEGR禁止条件がないことを条件としてEGRが開始される。一方、温間条件HCの下でエンジン始動が行われる場合には、EGRは直ちに許可状態となり、他のEGR禁止条件がないことを条件としてEGRが直ちに開始される。
ハイブリッド車両1では、ECU52は、冷間条件CCの下で車両システムが起動した場合(車両のパワースイッチON)には、温間条件HCの下での車両システムの起動であればEV走行モードが選択されるような低いエンジン要求パワーPerの下であっても、EV走行モードの開始前に内燃機関10を始動させてエンジン暖機運転を行う。エンジン暖機運転中の車両走行モードは、内燃機関10が作動しているのでHV走行モードとなる。なお、エンジン暖機運転中に実行される場合のHV走行モードの一例では、ハイブリッド車両1の一時停止中にも、暖機のために内燃機関10は停止されない。
エンジン暖機運転を必要とする冷間条件CCで車両システムが起動してからのハイブリッド車両1の1トリップ全体の燃費を向上させるためのエンジン発電の実行に関する課題について説明する。以下の説明では、第1MG30を用いたエンジン発電の発電量(電力量)Wg[kWh]に関し、エンジン暖機中に行われるエンジン発電の発電量Wgのことを、特に「発電量Wgw」と称する。
本実施形態では、上述の課題(更なる知見)に鑑み、ECU52は、次のような「エンジン発電制御」を実行する。このエンジン発電制御は、冷間条件CCにおいてハイブリッド車両1が始動された際に実行される。そして、エンジン発電制御では、ECU52は、ナビゲーション装置66から受け取った走行経路情報に基づいて、エンジン暖機後の平均車両パワーPvaを算出する。そのうえで、ECU52は、算出した平均車両パワーPvaが高い場合には、それが低い場合と比べて冷間条件CCにおける(すなわち、エンジン暖機中の)エンジン発電の発電量Wgwを小さく制限する。そして、温間条件HCへの移行後(すなわち、エンジン暖機後)のHV走行モードの実行中に、エンジン熱効率を向上させるEGR率を用いたEGRを伴うエンジン発電を実行する。
次に、図3及び図4を参照して、本実施形態のエンジン発電制御に関係する処理を説明する。まず、図3は、エンジン暖機中の第1MG30の発電量Wgwの制御のために実行される処理の流れを示すフローチャートである。ECU52は、車両システムの起動時(車両のパワースイッチON時)に図3に示す処理を一度実行する。
以上説明したように、本実施形態のエンジン発電制御によれば、エンジン暖機後の平均車両パワーPvaがパワー閾値THp未満の場合には、従来の知見通りに手法Aを用いてエンジン暖機中の発電量Wgwが積極的に増やされる。エンジン暖機後の平均車両パワーPvaが低いということは、それが高い場合と比べて、エンジン要求パワーPerが低い条件での車両走行の機会が多くなることを意味する。このため、EV走行モードが選択される頻度が高くなると考えられる。本エンジン発電制御によれば、このような低平均車両パワー条件では、エンジン暖機中にエンジンパワーPeを高めて早期暖機とエンジン熱効率向上を実現しつつ発電量Wgwが増やされる。そして、この発電量Wgwの増加によって高められたバッテリ38の電力を利用して、エンジン暖機後のEV走行可能距離を拡大できる。その結果、車両トリップ全体の燃費向上効果を高めることができる。
図5及び図7を参照して、本発明の実施の形態2について説明する。
実施の形態2は、以下の点において、上述した実施の形態1と相違している。すなわち、実施の形態1のエンジン発電制御では、エンジン暖機後の平均車両パワーPvaのパワー閾値THpを境にしてエンジン暖機中の発電量Wgwが増減される。これに対し、本実施形態のエンジン発電制御では、エンジン暖機後の平均車両パワーPvaに応じて、次の図5に示すようにエンジン暖機中の発電量Wgwが連続的に変更される。
図7は、実施の形態2においてエンジン暖機中の第1MG30の発電量Wgwの制御のために実行される処理の流れを示すフローチャートである。本実施形態のエンジン発電制御では、図3に示すフローチャートの処理に代え、図7に示すフローチャートの処理が図4に示すルーチンの処理とともに実行される。
上述した実施の形態1において説明した「更なる知見」によれば、エンジン暖機後の平均車両パワーPvaが高いほど、EGRを伴うHV走行モード中の燃料消費と電力消費のトータルでの効率が高くなり、それに伴い、EV走行モードの選択による燃費効果は低下する。
本発明に係るエンジン発電制御は、次のような前提構成を備えるハイブリッド車両であれば、図1に示す動力分割方式のハイブリッド車両1に限らず適用可能である。すなわち、EGR装置を有する内燃機関と、車両駆動とエンジン発電とを行う電動駆動装置(1又は複数の回転電機)とを備え、かつ、走行モードとしてEV走行モードとHV走行モード(エンジン発電を行いつつ電動駆動装置及び内燃機関の少なくとも一方の駆動力によって車両を走行させるモード)とを有するハイブリッド車両であれば適用可能である。したがって、本エンジン発電制御は、例えば、以下に図8及び図9を参照してそれぞれ説明される方式のハイブリッド車両2、3に適用されてもよい。なお、電動駆動装置が含む回転電機の数は3つ以上であってもよい。
10 内燃機関
22 EGR装置
30、70 第1モータジェネレータ(MG1)
32、72 第2モータジェネレータ(MG2)
34 動力分割機構
36 減速機構
38 バッテリ(蓄電装置)
40 車輪
50、74、80 車両制御装置
52、76、84 電子制御ユニット(ECU)
54、78、86 電力制御ユニット(PCU)
64 エンジン水温センサ
66 ナビゲーション装置
82 モータジェネレータ(MG)
88 クラッチ
Claims (2)
- 排気通路に排出された排気ガスの一部を気筒に再循環させる排気再循環を行うEGR装置を有する内燃機関と、
1又は複数の回転電機を含み、ハイブリッド車両の駆動と前記内燃機関の動力を用いたエンジン発電とを行う電動駆動装置と、
前記電動駆動装置と電力を授受し、充放電可能に構成された蓄電装置と、
前記ハイブリッド車両の出発地から目的地までの走行経路情報を取得する走行経路取得装置と、
を備える前記ハイブリッド車両を制御する車両制御装置であって、
前記ハイブリッド車両の走行モードは、
前記内燃機関の駆動力を用いずに、前記蓄電装置の電力で前記電動駆動装置を駆動して前記ハイブリッド車両を走行させるEV走行モードと、
前記エンジン発電を行いつつ前記電動駆動装置及び前記内燃機関の少なくとも一方の駆動力によって前記ハイブリッド車両を走行させるHV走行モードと、
を含み、
前記車両制御装置は、
前記内燃機関の温度が前記排気再循環の開始を許可する温度閾値未満である冷間条件において前記ハイブリッド車両の始動が行われた際に、前記始動の後に前記内燃機関の前記温度が前記温度閾値に到達してからの温間条件における車両走行区間の平均車両駆動パワーを前記走行経路情報に基づいて算出し、
算出した前記平均車両駆動パワーが高い場合には、それが低い場合と比べて前記冷間条件における前記エンジン発電の発電量を小さく制限し、かつ、前記温間条件への移行後の前記HV走行モードの実行中に、エンジン熱効率を向上させるEGR率を用いた前記排気再循環を伴う前記エンジン発電を実行し、
前記温間条件における車両走行区間の前記平均車両駆動パワーは、前記出発地から前記目的地までの全走行経路情報から前記冷間条件における車両走行区間に関する情報を除外して得られる前記温間条件における車両走行区間の走行経路情報に基づいて算出される
ことを特徴とする車両制御装置。 - 前記車両制御装置は、算出した前記平均車両駆動パワーが高いほど、前記冷間条件における前記エンジン発電の発電量を小さくする
ことを特徴とする請求項1に記載の車両制御装置。
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