US20020065162A1 - Transmission and vehicle using same - Google Patents
Transmission and vehicle using same Download PDFInfo
- Publication number
- US20020065162A1 US20020065162A1 US10/050,550 US5055002A US2002065162A1 US 20020065162 A1 US20020065162 A1 US 20020065162A1 US 5055002 A US5055002 A US 5055002A US 2002065162 A1 US2002065162 A1 US 2002065162A1
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- United States
- Prior art keywords
- gear
- gears
- motor
- motors
- input
- 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.)
- Abandoned
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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
- B60W20/30—Control strategies involving selection of transmission gear ratio
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/42—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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- 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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2054—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed by controlling transmissions or clutches
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- 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
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- 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
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
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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
- 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
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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
- 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
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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
- 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
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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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
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- 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
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
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- 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
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/10—Electrical machine types
- B60L2220/12—Induction machines
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- 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
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/10—Electrical machine types
- B60L2220/14—Synchronous machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
- F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
- F16H37/10—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing at both ends of intermediate shafts
- F16H2037/102—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing at both ends of intermediate shafts the input or output shaft of the transmission is connected or connectable to two or more differentials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/72—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/72—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously
- F16H3/724—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously using external powered electric machines
- F16H3/725—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously using external powered electric machines with means to change ratio in the mechanical gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/72—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously
- F16H3/727—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with a secondary drive, e.g. regulating motor, in order to vary speed continuously with at least two dynamo electric machines for creating an electric power path inside the gearing, e.g. using generator and motor for a variable power torque path
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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
- 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
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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
- 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
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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
- 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
- Y02T10/64—Electric machine technologies in electromobility
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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
- 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- 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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- 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
- Y02T10/72—Electric energy management in electromobility
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/946—Characterized by control of driveline clutch
Definitions
- the present invention relates to a transmission comprising motors and differential mechanisms, as well as a vehicle using the same.
- the present invention has been accomplished in view of the above-mentioned problems and it is the first object of the invention to provide a small-sized transmission constituted by small-sized motors, thereby realizing a stepless speed change function which permits vehicular operation in a region of a high engine efficiency while minimizing an electrical energy loss.
- the above first object of the present invention is achieved by a transmission having a plurality of differential mechanisms in which motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, wherein gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, and gear ratios from the input shafts to the motors in the plural differential mechanisms are set at a value different to each other.
- this construction is effective in reducing the size of the motor which controls the differential mechanism smaller in the gear ratio from the input shafts to the output shafts.
- the above first object is achieved also by a transmission having a plurality of differential mechanisms in which motor shafts driven by motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, wherein gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, the transmission further having a locking/unlocking mechanism for locking and unlocking the motor shaft in at least the differential mechanism larger in the gear ratio of the plural differential mechanisms.
- the above second object of the present invention is achieved by a vehicle having an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of the engine and transmits a driving force to wheels, the transmission having at least first and second differential mechanisms which input the driving force from the engine and output a driving force for the wheels, and also having first and second motors for controlling the first and second differential mechanisms, respectively, wherein gear ratios from input shafts to output shafts in the first and second differential mechanisms are set at a value different to each other and gear ratios from the input shafts to the first and second motors are set at a value different to each other.
- the above second object of the present invention is achieved also by a vehicle having an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of the engine and transmits a driving force to wheels, the transmission having at least first and second differential mechanisms which input the driving force from the engine and output a driving force for the wheels, and also having first and second motors for controlling the first and second differential mechanisms, respectively, wherein a gear ratio from an input shaft to an output shaft in the first differential mechanism is set at a value larger than a gear ratio from an input shaft to an output shaft in the second differential mechanism, the transmission further having a locking/unlocking mechanism for locking and unlocking a motor shaft which transmits the driving force of at least the first motor to the first differential mechanism.
- FIG. 1 is a construction diagram of a hybrid vehicle according to an embodiment of the present invention which realizes a speed change function with use of two planetary gears whose sun gears are controlled by motors.
- FIGS. 2A and 2B are speed-torque characteristic diagrams of motors 8 and 9 shown in FIG. 1.
- FIGS. 3A and 3B are speed-torque characteristic diagrams of motors 8 and 9 with a clutch 14 omitted in FIG. 1 and with the same gear ratio on an input side.
- FIG. 4 is a control flowchart for the hybrid vehicle shown in FIG. 1.
- FIG. 5 is a control flowchart for the motor 8 and clutch 14 shown in FIG. 4.
- FIG. 6 is a processing flowchart with a trouble occurring in the clutch 14 shown in FIG. 4.
- FIG. 7 is a construction diagram of a hybrid vehicle according to another embodiment of the present invention wherein input and output gears of a planetary gear 4 are constructed in a manner different from that in FIG. 1.
- FIG. 8 is a construction diagram of a hybrid vehicle according to a further embodiment of the present invention wherein a sun gear 4 s is used on an input side of a planetary gear 4 .
- FIG. 9 is a construction diagram of a hybrid vehicle according to a still further embodiment of the present invention wherein the number of constituent gears is decreased.
- FIG. 10 is a processing flowchart showing a further embodiment of the control processing illustrated in FIG. 4.
- FIG. 1 illustrates an automobile wherein, with use of energy of an engine 1 , tires 3 a and 3 b are rotated through drive shafts 2 a and 2 b to drive a body of the automobile.
- Planetary gears 4 and 6 which are important components in the present invention, respectively comprise sun gears 4 s and 6 s, planetary gears 4 p and 6 p, and ring gears 4 r and 6 r.
- the sun gears 4 s and 6 s are driven respectively by motors 8 and 9 which are controlled by power converters 10 and 11 , respectively.
- a permanent magnet synchronous motor is most suitable from the standpoint of attaining a high efficiency and a small size.
- a battery 12 is used for the supply of energy required by the motors 8 and 9 and for the storage of energy generated by the motors.
- Rotation of the engine 1 is transmitted to the planet gear 6 p of the planetary gear 6 via gears 15 , 16 and 17 and is also transmitted to the planet gear 4 p of the planetary gear 4 via gears 19 and 20 which are connected to the gears 16 .
- the driving torque of the engine 1 is distributed to the planetary gears 4 and 6 by the construction from the gear 15 to the gear 20 .
- What is important in the present invention is that a gear ratio from the gear 15 to the gear 17 and that from the gear 15 to the gear 20 are different from each other. As to the operation concerned, the details thereof will be described later.
- gears different in gear ratio are disposed on the output side.
- a gear 21 is connected to the ring gear 4 r to rotate a gear 5
- a gear 18 is connected to the ring gear 6 r to rotate a gear 7 .
- the gears 5 and 7 are clamped to each other and the tires 3 a and 3 b are driven with a torque transmitted from both gears.
- a gear ratio from the gear 15 located on the input side to the gear 5 on the output side via the planetary gear 4 which gear ratio means the ratio of a rotation cycle of the gear 5 to that of the gear 15 in a locked state of the sun gear 4 s and will hereinafter be referred to as gear ratio L, is set at a value larger than a gear ratio (gear ratio H hereinafter) from the gear 15 to the gear 7 via the planetary gear 6 .
- gear ratio L it is desirable to set the gear ratio L at a value three to six times as large as the gear ratio H.
- the gear ratio L is desirable to set the gear ratio L at a value four to five times as large as the gear ratio H, which value is advantageous to the improvement of the vehicular driving performance and the reduction in size of the transmission.
- the control unit 23 makes control so that when the vehicle is driven at a low speed and a low torque, the clutch 14 is engaged and a locking/unlocking device 13 is released, thereby permitting the vehicle to be driven with a torque of the motors 8 and 9 .
- a cooperative speed control with both motors 8 and 9 the vehicle is driven while keeping the engine speed ⁇ e zero.
- the engine 1 is rotated up to a startable speed and is started by a cooperative speed control of both motors 8 and 9 so as to permit a high-torque drive.
- the motor 8 When the vehicle is to be accelerated while running at a medium or higher speed, the motor 8 is brought into a driving condition and the motor 9 into a driving or power generating condition to attain the same function as in a continuously variable transmission or there can be attained a function of adding motor assisting torque to the engine drive force as in a hybrid automobile.
- both gear ratios are set at the same value, the motor 9 comes to operate in a narrow speed range relative to the speed range of the motor 8 .
- the gear ratio from the gear 15 to the gear 17 is set smaller than the gear ratio from the gear 15 to the gear 20 , the maximum operating speed of the motor 9 becomes high, so that the maximum torque of the motor 9 can be kept small and thus the size of the motor 9 can be reduced by changing the gear ratios. Since in this embodiment the gear ratio from the planet gear 4 p in the planetary gear 4 to the motor 8 and the gear ratio from the planet gear 6 p in the planetary gear 6 to the motor 9 are the same, the above description covered only the components up to the input portions of the planetary gears.
- FIGS. 2A and 2B show speed-torque characteristics (N-T characteristics) of the motors 8 and 9 both used in the embodiment of FIG. 1.
- FIGS. 3A and 3B show speed-torque characteristics of both motors obtained without using the clutch 14 in FIG. 1 and with the gear ratio from the gear 15 to the gear 17 and that from the gear 15 to the gear 20 set equal to each other.
- the motor 8 With the clutch 14 , the motor 8 exhibits such a characteristic as shown in FIG. 2A in which a high speed region is cut in comparison with FIG. 3A, thus permitting a motor design so as to increase the number of turns of winding and decrease the motor current, whereby the motor 8 and the power converter 10 can be reduced in size.
- FIG. 2A shows speed-torque characteristics
- the characteristic shown in FIG. 2B indicates that the maximum torque of the motor 9 can be diminished. This is effective in reducing the size of the motor 9 . As a matter of course, that the maximum torque of the motor 9 can be made small leads to a decrease of the motor current, thus permitting the reduction in size of the power converter 11 .
- FIG. 4 is a flowchart showing a control method for the system of FIG. 1 in which the control is made by the control unit 23 .
- the control unit 23 inputs operation commands intended by the vehicular driver such as an accelerator depression quantity Xa, a brake depression quantity Xb, and a change-over signal Xc which instructs forward, reverse, or neutral, as well as vehicular conditions such as vehicle velocity ⁇ v, charging condition of the battery 12 , and temperatures of various components.
- the control unit 23 judges whether the clutch 14 is in normal condition or not on the basis of a signal provided from a failure detector 24 shown in FIG. 1.
- step 108 If the answer is affirmative, there are performed normal control operations from step 103 to step 107 , while if the answer is negative, a clutch trouble processing is executed in step 108 . As to the contents of the processing performed in step 108 , it will be described later with reference to FIG. 6.
- step 103 a vehicular driving force command value ⁇ r is calculated on the basis of information values indicative of vehicle conditions and operation commands which were inputted in step 101 .
- step 104 a decision is made as to in what manner the driving forces of the engine 1 and motors 8 , 9 are to be distributed, including which of opening and closing commands for the clutch 14 is to be issued, on the basis of the vehicular driving force command value ⁇ r and the vehicle velocity ⁇ v. As a result there are determined drive command values (torque or speed command values).
- step 105 an engine control calculation is conducted on the basis of a driving force command value for the engine 1 and the engine is controlled to satisfy the driving force command value.
- step 106 a motor control calculation is conducted on the basis of a driving force command value for the motor 9 and a predetermined driving force is generated.
- step 107 a control is made to satisfy a driving force command value for the motor 8 .
- the processing should include the control for the clutch 14 , and the details of this processing are shown in FIG. 5. As noted in the previous operational description in connection with FIG. 1, it is when the vehicle speed exceeds a predetermined value that the clutch should be released.
- step 111 the present state of the clutch 14 is judged in step 111 , and if the clutch is engaged, the processing of step 112 is performed, while if the clutch is released, the processing of step 116 is conducted.
- step 112 if a command issued for the clutch 14 is an engaging command, it suffices for the clutch to be kept engaged, so a control processing is performed to give a driving force command for the motor 8 in step 113 . If the command for the clutch 14 is a release command in step 112 , a processing for releasing the clutch is carried out in step 114 .
- step 115 the control for the motor 8 is stopped since the clutch 14 is released.
- step 116 If the present state of the clutch 14 is a released state, a shift is made from step 111 to step 116 , in which a judgment is made about a command value for the clutch 14 . If the command is a clutch release command, a processing is performed to stop the control for the motor 8 in step 115 because it suffices for the clutch 14 to be kept released. If the clutch command is an engaging command in step 116 , an even speed control is made for the motor 8 in step 117 so that the rotational speed of the motor 8 is made coincident with that of the sun gear 4 s.
- step 118 there is made judgment as to whether the speed control has been completed or not in step 118 , and only when the speed control has been completed, a processing for engaging the clutch 14 is performed in step 119 .
- the driving force from the motor 8 is controlled by performing the above processings.
- step 121 it is determined whether the clutch 14 is improperly engaged or not. If the clutch is found to be improperly engaged, a processing is made in step 122 to limit a maximum torque capable of being generated by the vehicle. The maximum torque is transferred from the engine 1 and the motor 8 via the planetary gear 4 , but in the case where the clutch 14 cannot be engaged, the torque generated from the engine 1 and the motor 9 is transferred via the planetary gear 6 alone and serves as a driving torque for driving the vehicle. Thus, a limitation is made on the maximum torque capable of being generated from gear ratio setting conditions. Therefore, it is notified to the vehicle driver that the maximum torque is limited, and at the same time a processing is performed to also limit the torque command value. If the clutch 14 is properly engaged, a processing is made in step 123 to cancel the limitation on the maximum torque.
- step 124 it is judged whether the clutch 14 is improperly released or not, and if the clutch is improperly released, there are performed processings from step 125 to step 127 .
- step 125 a processing is made to limit the maximum vehicle speed. It is assumed that the limited maximum speed is not higher than the vehicle speed obtained when the motor speed shown in FIG. 2A exceeds 1 .
- step 126 the control for the motor 8 is stopped, and in step 127 a control for the engine 1 and the motor 9 is executed within limited speed range and torque range. By performing such processings the power converter 10 can be prevented from being damaged by a counter electromotive force at a high-speed rotation in an improperly released condition of the clutch 14 .
- step 124 if it is judged in step 124 that the clutch 14 is properly released, the limitation on the maximum speed is cancelled in step 128 , then in step 129 a control for the engine 1 and motors 8 , 9 is made in a limited state of the maximum torque.
- this embodiment it is possible to provide a transmission of small size and low cost possessing a stepless speed changing function and a motor assisting function. Besides, this transmission is applicable not only to ordinary types of automobiles but also to hybrid automobiles. Although the method adopted in this embodiment is limiting the maximum vehicle speed, the same effect as above can also be obtained even by adopting a method of limiting the maximum engine speed.
- FIG. 7 illustrates another embodiment of the present invention which is different from the embodiment shown in FIG. 1 in point of how to construct gears in an automobile. More specifically, the construction shown in FIG. 7 is different from the construction shown in FIG. 1 in a method of connecting gears of a planetary gear 4 on input and output sides.
- a gear 20 meshing with an input-side gear 19 is connected to a ring gear 4 r in a planetary gear 4 .
- a gear 21 engaged with a planet gear 4 p is connected to an output-side gear 5 .
- the gears of the planetary gear 4 connected to input and output sides in FIG. 7 are reverse to those in FIG. 1. Since the gear ratio from the ring gear to the planet gear in the planetary gear is larger than 1.0, the gear ratio from the gear 15 to the gear 20 and that from the gear 21 to the gear 5 can be set smaller than in FIG. 1.
- the gear ratio L from the gear 15 to the gear 5 is set at a value several times larger than the gear ratio H from the gear 15 to the gear 7 . If the same setting is made in the embodiment shown in FIG. 7, the gear ratios on input and output sides of the planetary gear 4 can be made closer to the gear ratios on input and output sides of the planetary gear 6 . Consequently, the gears can be designed more easily and can be arranged in a compact form, thus permitting the realization of a transmission smaller in size.
- FIG. 8 illustrates a further embodiment of the present invention which is different in how to construct gears from the embodiment shown in FIG. 7.
- This embodiment is characteristic in that a gear 15 is in mesh with a gear 17 and that the gear 17 is engaged with a planet gear 6 p and also with a sun gear 4 s in a planetary gear 4 .
- It is a planet gear 4 p in the planetary gear that is connected to a motor 8 through a clutch 14 , with a ring gear 4 r being connected to an output-side gear 5 through a gear 22 which is for reverse rotation.
- the gear ratio from the sun gear 4 s in the planetary gear 4 to the planet gear 4 p is usually several times larger than the gear ratio from the ring gear 4 r to the planet gear 4 p. Therefore, by connecting the gear 17 to the sun gear 4 s it is possible to obtain a larger gear ratio than in the embodiments illustrated in FIGS. 1 and 7 and hence possible to omit the gears 16 , 19 and 20 used in those previous embodiments. As a matter of course, the effect of reducing the motor size by setting the gear ratios on the input side of the two planetary gears in FIG. 1 at different values can also be obtained in the embodiment illustrated in FIG. 8.
- FIG. 9 illustrates an automobile using a still smaller number of gears according to a further embodiment of the present invention. Since a basic method for constructing planetary gears is the same as in the system of FIG. 7, a description will now be given while making comparison with FIG. 7.
- a rotating shaft of an engine 1 is connected to a planet gear 6 p in a planetary gear 6 and causes a gear 21 to rotate via a gear 15 .
- the gear 21 is engaged with a ring gear 4 r in a planetary gear 4 .
- This construction corresponds to the construction of FIG. 7 in which the gear ratio from the gear 15 to the gear 17 is set at 1.0.
- the gear ratio from the gear 15 to the gear 20 in FIG. 9 corresponds to the gear ratio from the gear 15 to the gear 20 in FIG. 7.
- equal characteristics can be obtained by making these set values coincident with each other.
- a ring gear 6 r in the planetary gear 6 outputs a torque to a gear 7 via a gear 18 which is engaged with the ring gear 6 r.
- the planetary gear 4 is connected to the same shaft as that of the gear 7 through a planet gear 4 p. A driving torque is outputted from this shaft to tires 3 a and 3 b.
- the construction shown in FIG. 9 can be made corresponding to the construction shown in FIG. 7. More specifically, the gear ratio from the gear 18 to the gear 7 in FIG. 9 corresponds to the gear ratio from the gear 18 to the gear 7 in FIG. 7, and if the gear ratio from the gear 21 to the gear 5 in FIG. 7 is set at 1.0, this construction is equal to that shown in FIG. 9.
- FIG. 10 shows another example of the clutch trouble processing method shown in FIG. 4, which is different from that shown in FIG. 6.
- This processing method is different from that of FIG. 6 in that step 130 is provided instead of steps 125 and 126 in FIG. 6.
- the processing of step 130 is performed when the clutch 14 is not properly released.
- a field weakening control is conducted for the motor 8 .
- a field magnet generated by the permanent magnet of the motor 8 as a permanent magnet synchronous motor is cancelled to some extent by the motor current.
- this control even if the motor 8 is rotated at a high speed, there is no fear that a counter electromotive force may become excessive, because of a substantial decrease of magnetic flux.
- the maximum vehicle speed is not limited, there is no fear of damage to the power converter 10 , so that the driving performance in clutch failure can be improved.
- the present invention can be practices using any of various combined methods.
- differential mechanisms planetary gears are used in the above embodiments, they may be substituted by commonly-used differential gears, or when importance is attached to quietness, there may be used harmonic gears.
- harmonic gears there may be used harmonic gears. It is needless to say that the transmission according to the present invention is applicable not only to automobiles but also to ships and various other vehicles, including rolling stock and bicycles.
- a plurality of differential mechanisms in which motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, and gear ratios from the input shafts to the motors of the plural differential mechanisms are set at a value different to each other, whereby it is possible to provide a transmission having a small-sized motor of a low torque and a motor prevented from high revolution and having a stepless speed changing function which permits operation in a high engine efficiency region while minimizing an electrical energy loss.
- a plurality of differential mechanisms in which motor shafts driven by motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, and there is provided a locking/unlocking mechanism for locking and unlocking the motor shaft in a differential mechanism which is larger at least in its gear ratio, whereby there can be provided a transmission having a small-sized motor of a low torque and a motor prevented from high revolution and having a stepless speed changing function which permits operation in a high engine efficiency region while minimizing an electrical energy loss.
- the transmission is provided with at least first and second differential mechanisms which input a driving force generated by the engine and which output a driving force for the wheels, and is also provided with first and second motors for controlling the first and second differential mechanisms, respectively, wherein gear ratios from the input shafts to the output shafts in the first and second differential mechanisms are set at a value different to each other and gear ratios from the input shafts to the first and second motors are also set at a value different to each other.
- the transmission is provided with at least first and second differential mechanisms which input a driving force generated by the engine and which output a driving force for the wheels, and is also provided with first and second motors for controlling the first and second differential mechanisms, respectively, wherein a gear ratio from the input shaft to the output shaft in the first differential mechanism is set at a value larger than a gear ratio from the input shaft to the output shaft in the second differential mechanism, and there is provided with a locking/unlocking mechanism for locking and unlocking a motor shaft which transmits the driving force of at least the first motor to the first differential mechanism. Also with this construction it is possible to provide a vehicle of a low cost and a reduced fuel consumption.
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Abstract
A vehicle provided with an engine 1 which generates a driving energy for the vehicle, planetary gears 4 and 6 comprising sun gears, planet gears and ring gears, motors 8 and 9 for respectively controlling the sun gears, and a clutch 14, the planet gears being connected to an input shaft driven by the engine and the ring gears connected to an output shaft for driving wheels, wherein gear ratios from the input shafts to the output shafts in the planetary gears 4 and 6 are set at a value different to each other. A stepless speed changing function which permits vehicular operation in a high engine efficiency region while minimizing an electrical energy loss is realized by a small-sized transmission using small-sized motors. The vehicle, which uses the transmission, can be operated in a high engine efficiency region while keeping an electrical energy loss to a minimum.
Description
- The present invention relates to a transmission comprising motors and differential mechanisms, as well as a vehicle using the same.
- As a drive system capable of reducing the fuel consumption of an engine there is known a hybrid vehicle which utilizes a motor drive force.
- Various types of hybrid vehicles such as series type and parallel type have been proposed, among which is included a series-parallel hybrid type using two motors and one planetary gear. For example, in Japanese Patent Laid-open No. Hei 7-135701 there is disclosed a method wherein a driving force of an engine is inputted to a planetary gear and control is made by a generator so that a vehicle is driven with a driving force obtained from an output shaft of the planetary gear. While a part of energy of the engine is generated by a generator, a driving force is assisted from a motor connected to the output shaft to drive the engine always in a high torque region of a high efficiency, and at the same time a speed change function can be attained.
- The same principle as above is also described in Japanese Patent Laid-open Nos. Sho 49-112067 and Sho 58-191364.
- According to the methods disclosed therein, power is generated by a generator and a driving force is obtained by a motor for realizing a speed change function, so that there occurs an electrical energy loss. Consequently, there occurs reduction in efficiency by an amount corresponding to the electrical energy loss with respect to the whole of the vehicle concerned despite the engine can be driven always at a highly efficient operating point.
- The present invention has been accomplished in view of the above-mentioned problems and it is the first object of the invention to provide a small-sized transmission constituted by small-sized motors, thereby realizing a stepless speed change function which permits vehicular operation in a region of a high engine efficiency while minimizing an electrical energy loss.
- It is the second object of the present invention to provide a vehicle capable of being driven in a region of a high engine efficiency while minimizing an electrical energy loss.
- The above first object of the present invention is achieved by a transmission having a plurality of differential mechanisms in which motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, wherein gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, and gear ratios from the input shafts to the motors in the plural differential mechanisms are set at a value different to each other.
- Particularly, this construction is effective in reducing the size of the motor which controls the differential mechanism smaller in the gear ratio from the input shafts to the output shafts.
- The above first object is achieved also by a transmission having a plurality of differential mechanisms in which motor shafts driven by motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, wherein gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, the transmission further having a locking/unlocking mechanism for locking and unlocking the motor shaft in at least the differential mechanism larger in the gear ratio of the plural differential mechanisms.
- According to this construction it is possible to reduce the size of the motor disposed on the side where the locking/unlocking mechanism is provided. Thus, by using both means described above in combination it is made possible to provide a transmission still smaller in size.
- The above second object of the present invention is achieved by a vehicle having an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of the engine and transmits a driving force to wheels, the transmission having at least first and second differential mechanisms which input the driving force from the engine and output a driving force for the wheels, and also having first and second motors for controlling the first and second differential mechanisms, respectively, wherein gear ratios from input shafts to output shafts in the first and second differential mechanisms are set at a value different to each other and gear ratios from the input shafts to the first and second motors are set at a value different to each other.
- The above second object of the present invention is achieved also by a vehicle having an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of the engine and transmits a driving force to wheels, the transmission having at least first and second differential mechanisms which input the driving force from the engine and output a driving force for the wheels, and also having first and second motors for controlling the first and second differential mechanisms, respectively, wherein a gear ratio from an input shaft to an output shaft in the first differential mechanism is set at a value larger than a gear ratio from an input shaft to an output shaft in the second differential mechanism, the transmission further having a locking/unlocking mechanism for locking and unlocking a motor shaft which transmits the driving force of at least the first motor to the first differential mechanism.
- FIG. 1 is a construction diagram of a hybrid vehicle according to an embodiment of the present invention which realizes a speed change function with use of two planetary gears whose sun gears are controlled by motors.
- FIGS. 2A and 2B are speed-torque characteristic diagrams of
motors - FIGS. 3A and 3B are speed-torque characteristic diagrams of
motors clutch 14 omitted in FIG. 1 and with the same gear ratio on an input side. - FIG. 4 is a control flowchart for the hybrid vehicle shown in FIG. 1.
- FIG. 5 is a control flowchart for the
motor 8 andclutch 14 shown in FIG. 4. - FIG. 6 is a processing flowchart with a trouble occurring in the
clutch 14 shown in FIG. 4. - FIG. 7 is a construction diagram of a hybrid vehicle according to another embodiment of the present invention wherein input and output gears of a
planetary gear 4 are constructed in a manner different from that in FIG. 1. - FIG. 8 is a construction diagram of a hybrid vehicle according to a further embodiment of the present invention wherein a
sun gear 4 s is used on an input side of aplanetary gear 4. - FIG. 9 is a construction diagram of a hybrid vehicle according to a still further embodiment of the present invention wherein the number of constituent gears is decreased.
- FIG. 10 is a processing flowchart showing a further embodiment of the control processing illustrated in FIG. 4.
- An embodiment of the present invention will be described below with reference to FIG. 1.
- FIG. 1 illustrates an automobile wherein, with use of energy of an engine1,
tires drive shafts Planetary gears sun gears planetary gears ring gears sun gears motors power converters 10 and 11, respectively. As a motor for an automobile, a permanent magnet synchronous motor is most suitable from the standpoint of attaining a high efficiency and a small size. Abattery 12 is used for the supply of energy required by themotors planet gear 6 p of theplanetary gear 6 viagears planet gear 4 p of theplanetary gear 4 viagears gears 16. Thus, the driving torque of the engine 1 is distributed to theplanetary gears gear 15 to thegear 20. What is important in the present invention is that a gear ratio from thegear 15 to thegear 17 and that from thegear 15 to thegear 20 are different from each other. As to the operation concerned, the details thereof will be described later. - Also as to the ring gears, gears different in gear ratio are disposed on the output side. A
gear 21 is connected to thering gear 4 r to rotate agear 5, while agear 18 is connected to thering gear 6 r to rotate agear 7. Thegears tires gear 15 located on the input side to thegear 5 on the output side via theplanetary gear 4, which gear ratio means the ratio of a rotation cycle of thegear 5 to that of thegear 15 in a locked state of thesun gear 4 s and will hereinafter be referred to as gear ratio L, is set at a value larger than a gear ratio (gear ratio H hereinafter) from thegear 15 to thegear 7 via theplanetary gear 6. Generally, it is desirable to set the gear ratio L at a value three to six times as large as the gear ratio H. Particularly when the transmission of the invention is applied to an automobile, it is desirable to set the gear ratio L at a value four to five times as large as the gear ratio H, which value is advantageous to the improvement of the vehicular driving performance and the reduction in size of the transmission. - A description will now be given of one method for driving the vehicle with use of a
controller 23 shown in FIG. 1. Thecontrol unit 23 makes control so that when the vehicle is driven at a low speed and a low torque, theclutch 14 is engaged and a locking/unlockingdevice 13 is released, thereby permitting the vehicle to be driven with a torque of themotors motors motors motor 9 is brought into a free running condition, while themotor 8 is locked electrically. As a result, the vehicle comes to be driven at the gear ratio L from thegear 15 to thegear 5 and therefore a driving force of high speed and high torque can be generated in thetires - When the vehicle is to be driven by the engine1 while running at a medium or higher speed, the
motor 8 is brought into a free running condition electrically, while themotor 9 is locked electrically and is thereafter locked mechanically by the locking/unlocking device 13. As a result, the vehicle is driven at the gear ratio H from thegear 15 to thegear 7. Therefore, the engine 1 operates in a low speed, high torque region and a change in speed is made to a high speed side by the transmission to drive the vehicle. In this steady state the engine 1 operates in a high efficiency region of a high torque. Besides, since the electrical energy is not utilized by themotors motor 8 is brought into a driving condition and themotor 9 into a driving or power generating condition to attain the same function as in a continuously variable transmission or there can be attained a function of adding motor assisting torque to the engine drive force as in a hybrid automobile. - In the case where the vehicle speed exceeds a predetermined speed in a high-speed running, a control is made to release the
clutch 14. If themotor 9 is locked, themotor 8 will be rotated at a high speed, which is therefore prevented by releasing the clutch 14. If a permanent magnet synchronous motor suitable for an automobile is used as themotor 8, an excessive counter electromotive force is generated by a high-speed rotation. Since an excessive counter electromotive force will result in destruction of the power converters, so it is necessary to make a design while paying attention to this point. In designing a motor so as to prevent the generation of an excessive counter electromotive force there is adopted a method wherein the number of turns of winding is made small, while an electric current to be passed through the winding is enhanced to ensure a required torque. By adopting such a high-speed rotation preventing construction as in this embodiment it is possible to make a motor design with a larger number of turns of winding. Thus, in this embodiment it is possible to make the electric current flowing in themotor 8 small and therefore it is possible to attain the reduction in size of themotor 8 and in capacity of thepower converter 10 from the standpoint of a thermal design. - Setting the gear ratio from the
gear 15 to thegear 17 smaller than the gear ratio from thegear 15 to thegear 20 is advantageous in carrying out the above operations. This point will now be described. The gear ratio L from thegear 15 to thegear 5 is set several times larger than the gear ratio H from thegear 15 to thegear 7. Besides, thegears - If both gear ratios are set at the same value, the
motor 9 comes to operate in a narrow speed range relative to the speed range of themotor 8. In view of this point, if the gear ratio from thegear 15 to thegear 17 is set smaller than the gear ratio from thegear 15 to thegear 20, the maximum operating speed of themotor 9 becomes high, so that the maximum torque of themotor 9 can be kept small and thus the size of themotor 9 can be reduced by changing the gear ratios. Since in this embodiment the gear ratio from theplanet gear 4 p in theplanetary gear 4 to themotor 8 and the gear ratio from theplanet gear 6 p in theplanetary gear 6 to themotor 9 are the same, the above description covered only the components up to the input portions of the planetary gears. - FIGS. 2A and 2B show speed-torque characteristics (N-T characteristics) of the
motors gear 15 to thegear 17 and that from thegear 15 to thegear 20 set equal to each other. With the clutch 14, themotor 8 exhibits such a characteristic as shown in FIG. 2A in which a high speed region is cut in comparison with FIG. 3A, thus permitting a motor design so as to increase the number of turns of winding and decrease the motor current, whereby themotor 8 and thepower converter 10 can be reduced in size. In comparison with the characteristic shown in FIG. 3B, the characteristic shown in FIG. 2B indicates that the maximum torque of themotor 9 can be diminished. This is effective in reducing the size of themotor 9. As a matter of course, that the maximum torque of themotor 9 can be made small leads to a decrease of the motor current, thus permitting the reduction in size of the power converter 11. - FIG. 4 is a flowchart showing a control method for the system of FIG. 1 in which the control is made by the
control unit 23. Instep 101 in FIG. 4, thecontrol unit 23 inputs operation commands intended by the vehicular driver such as an accelerator depression quantity Xa, a brake depression quantity Xb, and a change-over signal Xc which instructs forward, reverse, or neutral, as well as vehicular conditions such as vehicle velocity ωv, charging condition of thebattery 12, and temperatures of various components. Instep 102, thecontrol unit 23 judges whether the clutch 14 is in normal condition or not on the basis of a signal provided from afailure detector 24 shown in FIG. 1. If the answer is affirmative, there are performed normal control operations fromstep 103 to step 107, while if the answer is negative, a clutch trouble processing is executed instep 108. As to the contents of the processing performed instep 108, it will be described later with reference to FIG. 6. - When the clutch14 is judged to be normal, processings are performed successively from
step 103. Instep 103, a vehicular driving force command value τr is calculated on the basis of information values indicative of vehicle conditions and operation commands which were inputted instep 101. Next, instep 104, a decision is made as to in what manner the driving forces of the engine 1 andmotors step 105, an engine control calculation is conducted on the basis of a driving force command value for the engine 1 and the engine is controlled to satisfy the driving force command value. Instep 106, a motor control calculation is conducted on the basis of a driving force command value for themotor 9 and a predetermined driving force is generated. Further, instep 107, a control is made to satisfy a driving force command value for themotor 8. In this case, it is necessary that the processing should include the control for the clutch 14, and the details of this processing are shown in FIG. 5. As noted in the previous operational description in connection with FIG. 1, it is when the vehicle speed exceeds a predetermined value that the clutch should be released. Even if the clutch is released when the motor rotating speed exceeds a predetermined value, instead of using the vehicle speed, there will be obtained an equivalent effect. Even when the torque command value of themotor 8 is zero, if a command for releasing the clutch 14 is given, it is possible to diminish a mechanical loss caused by follow-up rotation of the motor. - In FIG. 5, the present state of the clutch14 is judged in step 111, and if the clutch is engaged, the processing of
step 112 is performed, while if the clutch is released, the processing ofstep 116 is conducted. Instep 112, if a command issued for the clutch 14 is an engaging command, it suffices for the clutch to be kept engaged, so a control processing is performed to give a driving force command for themotor 8 instep 113. If the command for the clutch 14 is a release command instep 112, a processing for releasing the clutch is carried out instep 114. Next, instep 115 the control for themotor 8 is stopped since the clutch 14 is released. - If the present state of the clutch14 is a released state, a shift is made from step 111 to step 116, in which a judgment is made about a command value for the clutch 14. If the command is a clutch release command, a processing is performed to stop the control for the
motor 8 instep 115 because it suffices for the clutch 14 to be kept released. If the clutch command is an engaging command instep 116, an even speed control is made for themotor 8 instep 117 so that the rotational speed of themotor 8 is made coincident with that of thesun gear 4 s. Next, instep 118 there is made judgment as to whether the speed control has been completed or not instep 118, and only when the speed control has been completed, a processing for engaging the clutch 14 is performed instep 119. The driving force from themotor 8 is controlled by performing the above processings. - The clutch trouble processing method shown in FIG. 4 will now be described with reference to the flowchart of FIG. 6. In
step 121 it is determined whether the clutch 14 is improperly engaged or not. If the clutch is found to be improperly engaged, a processing is made instep 122 to limit a maximum torque capable of being generated by the vehicle. The maximum torque is transferred from the engine 1 and themotor 8 via theplanetary gear 4, but in the case where the clutch 14 cannot be engaged, the torque generated from the engine 1 and themotor 9 is transferred via theplanetary gear 6 alone and serves as a driving torque for driving the vehicle. Thus, a limitation is made on the maximum torque capable of being generated from gear ratio setting conditions. Therefore, it is notified to the vehicle driver that the maximum torque is limited, and at the same time a processing is performed to also limit the torque command value. If the clutch 14 is properly engaged, a processing is made instep 123 to cancel the limitation on the maximum torque. - Next, in
step 124 it is judged whether the clutch 14 is improperly released or not, and if the clutch is improperly released, there are performed processings fromstep 125 to step 127. In step 125 a processing is made to limit the maximum vehicle speed. It is assumed that the limited maximum speed is not higher than the vehicle speed obtained when the motor speed shown in FIG. 2A exceeds 1. Next, instep 126, the control for themotor 8 is stopped, and in step 127 a control for the engine 1 and themotor 9 is executed within limited speed range and torque range. By performing such processings thepower converter 10 can be prevented from being damaged by a counter electromotive force at a high-speed rotation in an improperly released condition of the clutch 14. On the other hand, if it is judged instep 124 that the clutch 14 is properly released, the limitation on the maximum speed is cancelled instep 128, then in step 129 a control for the engine 1 andmotors - Thus, according to this embodiment it is possible to provide a transmission of small size and low cost possessing a stepless speed changing function and a motor assisting function. Besides, this transmission is applicable not only to ordinary types of automobiles but also to hybrid automobiles. Although the method adopted in this embodiment is limiting the maximum vehicle speed, the same effect as above can also be obtained even by adopting a method of limiting the maximum engine speed.
- FIG. 7 illustrates another embodiment of the present invention which is different from the embodiment shown in FIG. 1 in point of how to construct gears in an automobile. More specifically, the construction shown in FIG. 7 is different from the construction shown in FIG. 1 in a method of connecting gears of a
planetary gear 4 on input and output sides. In FIG. 7, agear 20 meshing with an input-side gear 19 is connected to aring gear 4 r in aplanetary gear 4. Further, agear 21 engaged with aplanet gear 4 p is connected to an output-side gear 5. Thus, the gears of theplanetary gear 4 connected to input and output sides in FIG. 7 are reverse to those in FIG. 1. Since the gear ratio from the ring gear to the planet gear in the planetary gear is larger than 1.0, the gear ratio from thegear 15 to thegear 20 and that from thegear 21 to thegear 5 can be set smaller than in FIG. 1. - It has been described previously that in the embodiment shown in FIG. 1 the gear ratio L from the
gear 15 to thegear 5 is set at a value several times larger than the gear ratio H from thegear 15 to thegear 7. If the same setting is made in the embodiment shown in FIG. 7, the gear ratios on input and output sides of theplanetary gear 4 can be made closer to the gear ratios on input and output sides of theplanetary gear 6. Consequently, the gears can be designed more easily and can be arranged in a compact form, thus permitting the realization of a transmission smaller in size. - FIG. 8 illustrates a further embodiment of the present invention which is different in how to construct gears from the embodiment shown in FIG. 7. This embodiment is characteristic in that a
gear 15 is in mesh with agear 17 and that thegear 17 is engaged with aplanet gear 6 p and also with asun gear 4 s in aplanetary gear 4. It is aplanet gear 4 p in the planetary gear that is connected to amotor 8 through a clutch 14, with aring gear 4 r being connected to an output-side gear 5 through agear 22 which is for reverse rotation. The gear ratio from thesun gear 4 s in theplanetary gear 4 to theplanet gear 4 p is usually several times larger than the gear ratio from thering gear 4 r to theplanet gear 4 p. Therefore, by connecting thegear 17 to thesun gear 4 s it is possible to obtain a larger gear ratio than in the embodiments illustrated in FIGS. 1 and 7 and hence possible to omit thegears planetary gear 4, since the rotational direction of thesun gear 4 s and that of thering gear 4 r rotated thereby are opposite to each other, thegear 22 is used to obtain a reverse rotation. As a result, upon operation of the engine 1, the rotation of thegear 5 and that of thegear 7 become coincident with each other within the usual speed range of each motor. - Thus, according to this embodiment it is possible to decrease the number of gears used and hence it is possible to realize a more compact transmission.
- FIG. 9 illustrates an automobile using a still smaller number of gears according to a further embodiment of the present invention. Since a basic method for constructing planetary gears is the same as in the system of FIG. 7, a description will now be given while making comparison with FIG. 7. A rotating shaft of an engine1 is connected to a
planet gear 6 p in aplanetary gear 6 and causes agear 21 to rotate via agear 15. Thegear 21 is engaged with aring gear 4 r in aplanetary gear 4. This construction corresponds to the construction of FIG. 7 in which the gear ratio from thegear 15 to thegear 17 is set at 1.0. The gear ratio from thegear 15 to thegear 20 in FIG. 9 corresponds to the gear ratio from thegear 15 to thegear 20 in FIG. 7. Thus, equal characteristics can be obtained by making these set values coincident with each other. - In this embodiment, a
ring gear 6 r in theplanetary gear 6 outputs a torque to agear 7 via agear 18 which is engaged with thering gear 6 r. Theplanetary gear 4 is connected to the same shaft as that of thegear 7 through aplanet gear 4 p. A driving torque is outputted from this shaft totires gear 18 to thegear 7 in FIG. 9 corresponds to the gear ratio from thegear 18 to thegear 7 in FIG. 7, and if the gear ratio from thegear 21 to thegear 5 in FIG. 7 is set at 1.0, this construction is equal to that shown in FIG. 9. - In this way a similar performance to that in FIG. 7 can be attained by a system configuration with a smaller number of gears and thus this embodiment is characteristic in that a hydbrid automobile capable of attaining a speed changing function at low cost can be realized.
- FIG. 10 shows another example of the clutch trouble processing method shown in FIG. 4, which is different from that shown in FIG. 6. This processing method is different from that of FIG. 6 in that
step 130 is provided instead ofsteps step 130 is performed when the clutch 14 is not properly released. In this case, a field weakening control is conducted for themotor 8. According to this field weakening control, a field magnet generated by the permanent magnet of themotor 8 as a permanent magnet synchronous motor is cancelled to some extent by the motor current. With this control, even if themotor 8 is rotated at a high speed, there is no fear that a counter electromotive force may become excessive, because of a substantial decrease of magnetic flux. Thus, even if the maximum vehicle speed is not limited, there is no fear of damage to thepower converter 10, so that the driving performance in clutch failure can be improved. - Transmissions using two planetary gears controlled by motors and hybrid vehicles using the same, both embodying the present invention, have been described above. The present invention is also applicable to the case where three or more planetary gears are used, so that a still more steps of a transmission can also be constituted. Although the motors referred to above are mainly synchronous motors using a permanent magnet, there may be used a DC motor using a permanent magnet as a field magnet. The present invention is further applicable to the case where a permanent magnet-free induction motor or synchronous motor is used. It goes without saying that a combination of the motors referred to above can also be used effectively. Although the control method described above mainly control the sun gear in each planetary gear with a motor, there may be adopted another method controlling another gear. Thus, the present invention can be practices using any of various combined methods. As to the differential mechanisms, planetary gears are used in the above embodiments, they may be substituted by commonly-used differential gears, or when importance is attached to quietness, there may be used harmonic gears. It is needless to say that the transmission according to the present invention is applicable not only to automobiles but also to ships and various other vehicles, including rolling stock and bicycles.
- In the present invention, there are used a plurality of differential mechanisms in which motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, and gear ratios from the input shafts to the motors of the plural differential mechanisms are set at a value different to each other, whereby it is possible to provide a transmission having a small-sized motor of a low torque and a motor prevented from high revolution and having a stepless speed changing function which permits operation in a high engine efficiency region while minimizing an electrical energy loss.
- According to the present invention, in another aspect thereof, there are used a plurality of differential mechanisms in which motor shafts driven by motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, the input and output shafts for the plural differential mechanisms being used in common, gear ratios from the input shafts to the output shafts in the plural differential mechanisms are set at a value different to each other, and there is provided a locking/unlocking mechanism for locking and unlocking the motor shaft in a differential mechanism which is larger at least in its gear ratio, whereby there can be provided a transmission having a small-sized motor of a low torque and a motor prevented from high revolution and having a stepless speed changing function which permits operation in a high engine efficiency region while minimizing an electrical energy loss.
- According to the present invention, in a further aspect thereof, in a vehicle having an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of the engine and transmits a driving force for wheels, the transmission is provided with at least first and second differential mechanisms which input a driving force generated by the engine and which output a driving force for the wheels, and is also provided with first and second motors for controlling the first and second differential mechanisms, respectively, wherein gear ratios from the input shafts to the output shafts in the first and second differential mechanisms are set at a value different to each other and gear ratios from the input shafts to the first and second motors are also set at a value different to each other. With this construction it is possible to provide a vehicle of a low cost and a reduced fuel consumption.
- According to the present invention, in a still further aspect thereof, in a vehicle having an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of the engine and transmits a driving force to wheels, the transmission is provided with at least first and second differential mechanisms which input a driving force generated by the engine and which output a driving force for the wheels, and is also provided with first and second motors for controlling the first and second differential mechanisms, respectively, wherein a gear ratio from the input shaft to the output shaft in the first differential mechanism is set at a value larger than a gear ratio from the input shaft to the output shaft in the second differential mechanism, and there is provided with a locking/unlocking mechanism for locking and unlocking a motor shaft which transmits the driving force of at least the first motor to the first differential mechanism. Also with this construction it is possible to provide a vehicle of a low cost and a reduced fuel consumption.
Claims (12)
1. A transmission including a plurality of differential mechanisms in which motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, said input shaft and said output shaft for said plural differential mechanisms being used in common, wherein gear ratios from said input shafts to said output shafts in said plural differential mechanisms are set at a value different to each other, and gear ratios from said input shafts to the motors in said plural differential mechanisms are set at a value different to each other.
2. A transmission including first and second planetary gears each comprising at least three components of a sun gear, a planet gear and a ring gear; first and second motors for respectively controlling the sun gears in said first and second planetary gears; input shafts connected to the planet gears in said first and second planetary gears; and output shafts connected to the ring gears in said first and second planetary gears; wherein gear ratios from said input shaft to said first and second motors are set at a value different to each other.
3. A transmission including first and second planetary gears each comprising at least three components of a sun gear, a planet gear and a ring gear; first and second motors for respectively controlling the sun gears in said first and second planetary gears; input shafts connected to the ring gears in said first and second planetary gears; and output shafts connected to the planet gears in said first and second planetary gears; wherein gear ratios from said input shafts to said first and second motors are set at a value different to each other.
4. A transmission including an input shaft which inputs a driving force; an output shaft which outputs a driving force; first and second planetary gears each comprising a sun gear, a planetary gear and a ring gear; and first and second motors for respectively controlling the sun gears in said first and second planetary gears; wherein the planet gear in said first planetary gear and the ring gear in said second planetary gear are connected to said input shaft, while the ring gear in said first planetary gear and the planet gear in said second planetary gear are connected to said output shaft.
5. A transmission including a plurality of differential mechanisms in which motor shafts driven by motors control a difference in the number of revolutions between an input shaft and an output shaft thereof, said input shaft and said output shaft for said plural differential mechanisms being used in common, wherein gear ratios from said input shafts to said output shafts in said plural differential mechanisms are set at a value different to each other, and there is further included a locking/unlocking mechanism for locking and unlocking the motor shaft in at least a differential mechanism of a larger gear ratio of said plural differential mechanisms.
6. A vehicle including an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of said engine and transmits a driving force to wheels, said transmission including at least first and second differential mechanisms which input a driving force generated by said engine and which output a driving force for the wheels, and first and second motors for respectively controlling said first and second differential mechanisms, wherein gear ratios from input shafts to output shafts in said first and second differential mechanisms are set at a value different to each other, and gear ratios from said input shafts to said first and second motors are set at a value different to each other.
7. A vehicle including an engine which generates a driving energy for driving the vehicle and a transmission which changes the rotational speed of said engine and transmits a driving force to wheels, said transmission including at least first and second differential mechanisms which input a driving force generated by said engine and which output a driving force for the wheels, and first and second motors for respectively controlling said first and second differential mechanisms, wherein a gear ratio from an input shaft to an output shaft in said first differential mechanism is set at a value larger than a gear ratio from the input shaft to the output shaft in said second differential mechanism, and there is further included a locking/unlocking mechanism for locking and unlocking a motor shaft which transmits a driving force of at least said first motor to said first differential mechanism.
8. A vehicle according to claim 7 , wherein said locking/unlocking mechanism is unlocked when the rotational speed of said motor shaft is at a predetermined value or more.
9. A vehicle according to claim 7 , wherein said locking/unlocking mechanism is unlocked when said first motor stops generation of a torque.
10. A vehicle according to claim 7 , wherein said locking/unlocking mechanism is locked after the rotational speed of the motor shaft in the locking/unlocking mechanism has been subjected to even speed control by said first motor.
11. A vehicle according to claim 7 , further including a failure detecting means for detecting a failure of said locking/unlocking mechanism, and a speed limiting means which limits the speed of the vehicle or of the engine in accordance with a signal provided from said failure detecting means.
12. A vehicle according to claim 7 , further including a failure detecting means for detecting a failure of said locking/unlocking mechanism, and a voltage suppressing means which suppresses a counter electromotive force of said first motor in accordance with a signal provided from said failure detecting means.
Priority Applications (1)
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US10/050,550 US20020065162A1 (en) | 1998-04-28 | 2002-01-18 | Transmission and vehicle using same |
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US20010009878A1 (en) | 2001-07-26 |
US6234930B1 (en) | 2001-05-22 |
EP1080981A1 (en) | 2001-03-07 |
DE69841499D1 (en) | 2010-03-25 |
EP1080981B1 (en) | 2010-02-10 |
JP3637870B2 (en) | 2005-04-13 |
EP1080981A4 (en) | 2006-01-18 |
WO1999055551A1 (en) | 1999-11-04 |
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