WO2011081593A1 - Electric hybrid system - Google Patents

Electric hybrid system Download PDF

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Publication number
WO2011081593A1
WO2011081593A1 PCT/SE2010/051321 SE2010051321W WO2011081593A1 WO 2011081593 A1 WO2011081593 A1 WO 2011081593A1 SE 2010051321 W SE2010051321 W SE 2010051321W WO 2011081593 A1 WO2011081593 A1 WO 2011081593A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
hybrid system
electric hybrid
motor unit
configuration
Prior art date
Application number
PCT/SE2010/051321
Other languages
French (fr)
Inventor
Pontus Karlsson
Daniel Engblom
Original Assignee
BAE Systems Hägglunds Aktiebolag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BAE Systems Hägglunds Aktiebolag filed Critical BAE Systems Hägglunds Aktiebolag
Publication of WO2011081593A1 publication Critical patent/WO2011081593A1/en

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Classifications

    • 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
    • B60L50/15—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with additional electric power supply
    • 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
    • B60K6/48—Parallel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/30—Conjoint control of vehicle sub-units of different type or different function including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/2075—Control of propulsion units of the hybrid type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2091—Control of energy storage means for electrical energy, e.g. battery or capacitors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • 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

Definitions

  • the invention relates to an electric hybrid system according to the preamble of claim 1 .
  • the invention also relates to a motor vehicle.
  • EP 1793128 A1 shows an electric hybrid system for a construction vehicle with a hybrid drive line comprising a combustion engine, an electric motor/generator, transmission and two hydraulic pumps.
  • the combustion engine is connected to the transmission via a coupling facilitating a disconnection of the combustion engine torque to the transmission.
  • the electric motor is coupled to the transmission via an input/output shaft and may function as both generator when driven by means of the combustion engine and electric motor when supplied with electricity.
  • the hydraulic pumps are coupled to the transmission via an output shaft and may be driven by both the combustion engine and the electric motor.
  • An object of the present invention is to provide an electric hybrid system which is cost efficient, facilitates energy efficient drive and at the same time requires few components.
  • an electric hybrid system for motor vehicle comprising a combustion engine, a transmission configuration, at least one pump configuration for energy supply of working operations of the vehicle, at least one generator/motor unit, an energy storage configuration connected to the generator/motor unit, wherein the combustion engine is connected to the transmission configuration for driving, wherein at least one pump configuration is arranged to provide an increased energy content of at least one working operation by means of a pump function, and recover such increased energy content by means of a motor function via said transmission configuration.
  • said energy content comprises potential energy.
  • energy during lifting, tipping of load or the corresponding may be utilized.
  • said energy content comprises kinetic energy.
  • energy during movement of vehicles may be utilized.
  • the combustion engine is for driving engagably and disengagably connected to the transmission configuration.
  • said pump configuration comprises a pump/motor unit.
  • the same component is utilized for both pumping and hydraulic motor.
  • said pump/motor unit is constituted by a pump/hydraulic motor unit.
  • the pump/motor unit may be utilized during working operations requiring hydraulics.
  • said pump function offers variable pump capacity.
  • a more flexible system and consequently a more efficient system is obtained.
  • said motor function offers variable capacity.
  • a more flexible system and consequently a more efficient system is obtained.
  • said at least one working operation includes an excavation function.
  • said at least one working operation includes a tipping function for a loading platform.
  • said potential energy is arranged to be recovered via a fluid medium included in the pump configuration.
  • said fluid medium is constituted by a hydraulic medium.
  • a hydraulic medium such as oil efficient drive of the system is facilitated.
  • Fig. 1 schematically illustrates a motor vehicle according to an embodiment of the present invention
  • Fig. 2 schematically illustrates an electric hybrid system according to an embodiment of the present invention
  • Fig. 3 schematically illustrates an electric hybrid system according to an embodiment of the present invention.
  • Fig. 1 schematically illustrates a motor vehicle 1 according to an embodiment of the present invention.
  • the motor vehicle 1 is according to an embodiment constituted by a construction vehicle.
  • the motor vehicle 1 in fig. 1 is illustrated as a construction vehicle with tracks 2 for driving the vehicle, a vehicle body 3 rotatable about an essentially vertical axle X the body having a cabin.
  • the vehicle further comprises a bucket 5 for digging/excavation which may be raised and lowered by means of an arm configuration 6 controllable with hydraulic means.
  • Fig. 2 schematically illustrates an electric hybrid system I according to an embodiment of the present invention.
  • the electric hybrid system I comprises a combustion engine 10, a coupling 12, a transmission configuration 20 and a pump/hydraulic motor unit 30 of variable type.
  • the coupling 12 is connected to the combustion engine 10 via an output shaft 1 1 of the combustion engine.
  • the coupling 12 is arranged in an engaged position to transfer power from the combustion engine 10.
  • the coupling 12 is arranged in a disengaged position to prevent transfer of power from the combustion engine 10.
  • the coupling 12 is connected to an input shaft 14 of the transmission configuration 20, wherein power from the combustion engine 10 is arranged to be transferred to the input shaft 14 of the transmission configuration 20 when the coupling 12 is in the engaged position, i.e. brought into engagement.
  • the pump/hydraulic motor unit 30 is connected to an input/output shaft 22 of the transmission configuration 20.
  • the electric hybrid system I further comprises a generator/motor unit 40 connected to an input/output shaft 24 of the transmission configuration 20, wherein the pump/hydraulic motor unit 30 and the generator/motor unit 40 are arranged parallel relative to the combustion engine 10, i.e. the input/output shaft 22 connected to the pump/hydraulic motor unit 30 is arranged parallel relative to the input/output shaft 24 connected to the generator/motor unit 40.
  • the generator/motor unit 40 is arranged in a first drive condition to be driven by means of the combustion engine 10, wherein it is arranged to operate as generator.
  • the generator/motor unit 40 is arranged in a second drive condition to receive electric power wherein it is arranged to operate as electric motor.
  • the electric hybrid system I in addition comprises an energy storage unit 50 for storing electric energy.
  • the energy storage unit 50 may be constituted by a battery unit, a capacitor unit or the like.
  • the energy storage unit 50 is arranged in the first condition of the generator//motor unit 40 to store electric energy supplied from the generator/motor unit 40 when it operates as generator.
  • the energy storage unit 50 is arranged in the second condition of the generator/motor unit 40 to supply electric power to the generator/motor unit 40 when it operates as electric motor.
  • the pump/hydraulic motor unit 30 is arranged by means of a pump function to provide increased energy content of a working operation and by means of a hydraulic motor function recover such increased energy content via the transmission configuration 20.
  • Said energy content comprises potential energy and/or kinetic energy.
  • the pump/hydraulic motor unit 30 is consequently arranged in a first condition to operate as a pump, wherein it is arranged to supply a hydraulic medium for increasing the energy content of a working operation.
  • the pump/hydraulic motor unit 30 is connected to a load L, which may be constituted by a bucket, loading platform, vehicle body or the corresponding of the vehicle.
  • the working operation may comprise an excavation or a digging function by means of a bucket or tipping function by means of a loading platform, wherein the energy content comprises potential energy.
  • said hydraulic medium is arranged to increase the energy content by means of the pump function wherein the hydraulic medium is supplied so that lifting of bucket for digging/excavation, loading platform or the corresponding is provided.
  • the working operation may also comprise a turning function such as turning about an essentially vertical axel of a vehicle body of the vehicle relative to the wheels/tracks of the vehicle, or a drive function for driving of the vehicle, wherein the energy content comprises kinetic energy.
  • said hydraulic medium is arranged to increase the energy content by means of the pump function wherein the hydraulic medium is supplied such that rotation of the vehicle body of the vehicle, movement of the vehicle or the corresponding is provided.
  • the pump/hydraulic motor unit 30 is further consequently arranged to in a second condition operate as a hydraulic motor, wherein the energy in said hydraulic medium is recovered during reduction of potential energy where the working operation implies lowering of the bucket for digging/excavation, loading platform or the corresponding and/or reduction of kinetic energy where the working operation implies breaking of rotation of the vehicle body or vehicle movement.
  • said hydraulic motor function is provided wherein the pump/hydraulic motor unit 30 is arranged to drive the generator/motor unit 40 in its first condition operating as a generator.
  • the pump/hydraulic motor unit 30 is according to an embodiment variable which results in increased flexibility and consequently a more efficient system.
  • the pump function of the pump/hydraulic motor unit 30 is according to an embodiment variable which results in increased flexibility and consequently more efficient pump function.
  • the hydraulic motor function of the pump/hydraulic motor unit 30 is according to an embodiment variable which results in increased flexibility and consequently more efficient hydraulic motor function.
  • the transmission configuration 20 comprises a distribution transmission which is controllable for distribution of power.
  • the distribution transmission is controllably arranged to distribute the power from the combustion engine 10 such that in a fist case all power is transferred to the pump/hydraulic motor unit 30, and in a second case a part of the power is transmitted to the pump/hydraulic motor unit 30 and a part of the power to the generator/motor unit 40 when operating as a generator.
  • all power may be transferred from the combustion engine 10 to the pump/hydraulic motor unit 30, at the same time as power from the generator/motor unit 40 when operating as an electric motor is transferred to the pump/hydraulic motor unit 30 such that the power being transferred to the pump/hydraulic motor unit 30 amounts to the sum of the power from the combustion engine 10 and the generator/motor unit 40.
  • more efficient drive of the pump/hydraulic motor unit 30 is facilitated such that when it operates as pump, may pump with higher power.
  • power may further be transmitted from the generator/motor unit 40 by means of energy from the energy storage unit 50 wherein the generator/motor unit 40 operates as electric motor.
  • the power may be transmitted from the generator/motor unit 40 to the pump/hydraulic motor unit 30 which operates as pump.
  • power may further be transmitted from the pump/hydraulic motor unit 30 by means of recovered energy content from a working operation, wherein it operates as hydraulic motor.
  • the power may be transferred from the pump/hydraulic motor unit 30 to the generator/motor unit 40 which operates as generator.
  • power may also be transferred from the pump/hydraulic motor unit 30, when it operates as a hydraulic motor, to the generator/motor unit 40, at the same time as all power from the combustion engine 10 is transferred to the generator/motor unit 40, where the generator/motor unit 40 operates as generator, wherein the power being transferred to the generator/motor unit 40 amounts up to the sum of the power from the combustion engine 10 and the pump/hydraulic motor unit 30.
  • the power being transferred to the generator/motor unit 40 amounts up to the sum of the power from the combustion engine 10 and the pump/hydraulic motor unit 30.
  • power E1 is transferred from the combustion engine to the pump/motor unit 30 as a power E2 and/or to the generator/motor unit 40 as a power E3.
  • power E4 from the pump/hydraulic motor unit 30 may be transferred to the generator/motor unit 40.
  • power E5 may be transferred from the generator/motor unit 40 to the pump/motor unit 30.
  • a pump/hydraulic motor unit 30 By using a pump/hydraulic motor unit 30 with a pump function and hydraulic motor function only one unit is required for these functions wherein fewer components are required. As increased energy content provided by means of pump function of the pump/hydraulic motor unit 30 is recovered by means of the motor function via the transmission configuration 20 the flexibility of the system is increased in that the pump function may be utilized for both generation of electric energy and possibility to utilizing of drive of desired load and other function such as driving of another pump or the corresponding. This is apparent from the embodiment illustrated in fig. 3.
  • Fig. 3 schematically illustrates an electric hybrid system II according to an embodiment of the present invention.
  • the electric hybrid system II according to this embodiment differs from the electric hybrid system II according to the embodiment in fig. 2 in that more components are included, wherein the transmission configuration 120 according to this embodiment has more shafts arranged parallel to each other. This illustrates an example of how an electric hybrid system according to the present invention may be constructed.
  • the electric hybrid system II comprises a rectifier 1 10 connected to the generator/motor unit 40 and arranged to rectify the alternating voltage from the generator/motor unit 40, and an alternator 1 12 arranged to alternate the continuous voltage from the generator/motor unit 40, which alternator 1 12 is connected to an electric motor 130, which in turn is connected to a drive unit 140 for propulsion of the vehicle.
  • a rectifier 1 10 and the alternator 1 12 voltage and frequency for the electric motor 120 may be controlled, the frequency controlling the rotational speed and the voltage the torque.
  • the energy storage unit 50 is connected to said rectifier 1 10 and alternator 1 12.
  • the electric hybrid system II further comprises an additional pump configuration 150 which is arranged in series with the pump/hydraulic motor unit 30, which pump configuration may be arranged for providing hydraulic pressure for e.g. control.
  • the pump/hydraulic motor unit 30 and the pump configuration 150 are connected to a unit 154, which may be constituted by one or several additional pumps.
  • the electric hybrid system II also comprises an electric machine 160 connected to an input shaft 162 of the transmission configuration 120, which shaft is parallel to input shaft 1 14 connected to the coupling 12 and to the input/output shaft 122 connected to the hydraulic pump 150 and the pump/hydraulic motor unit 30.
  • the electric machine 160 could constitute an electric motor, or a generator/motor unit.
  • the electric hybrid system II according to this embodiment comprises according to a variant a mechanical drive unit 170, illustrated with a dotted line in fig. 3.
  • the mechanical drive unit 170 comprises an output shaft 172 of the transmission configuration 120 and a mechanical load 174 connected to the output shaft 172, which load may constitute any suitable load such as propulsion, fan, AC-compressor or the corresponding.
  • the output shaft 172 of the transmission configuration 120 connected to the mechanical load 174 is parallel to the input shaft 162 connected to the electric machine 160, parallel to the input/output shaft 24 connected to the generator/motor unit 40 and to the input/output shaft 22 connected to the pump/hydraulic motor 30.
  • the electric hybrid system II comprises according to a variant a hydraulic drive unit 180, illustrated with a dotted line in fig. 3.
  • the hydraulic drive unit comprises a hydraulic motor 181 and a shaft 182 of the transmission configuration 120 connected to the hydraulic motor 181 and a load 184 connected to the shaft 182, which load may constitute any suitable load such as additional pumps.
  • the output shaft 182 of the transmission configuration 120 connected to the load 184 is parallel to the input shaft 162 connected to the electric machine 160, parallel to the input/output shaft 24 connected to the generator/motor unit 40, the output shaft 172 connected to the mechanical load 174, and the input/output shaft 22 connected to the pump/hydraulic motor unit 30.
  • the transmission configuration 120 comprises gear wheels or the corresponding, which are connected to the above mentioned shafts 14, 22, 24, 162, 172, 182 and arranged, when engaged, to transfer power to loads connected to the different shafts.
  • the coupling 12 together with the transmission configuration 120 constitute a summation gear.
  • the pump/hydraulic motor unit 30 When the pump/hydraulic motor unit 30 operates as hydraulic motor, it may consequently recover the, at the pump function, increased energy content via the transmission configuration 20.
  • This energy recovery may be provided in that the power is transferred from the pump/hydraulic motor unit 30 to the generator/motor unit 40 which operates as generator, which may occur both when the combustion engine 10 is engaged, when energy from both the combustion engine 10 and the pump/hydraulic motor 30 operating as hydraulic motor, and the combustion engine 10 is disengaged, when energy from the pump/hydraulic motor unit 30 operating as hydraulic motor is transferred to the generator.
  • the additional hydraulic motor may also contribute.
  • the pump/hydraulic motor unit 30 when operating as a hydraulic motor, may transfer the power to the electric machine and/or the mechanical load. Consequently a flexible and efficient electric hybrid system is obtained.
  • the pump/hydraulic motor unit 30 is variable, in accordance with the embodiment in fig. 2.
  • the pump configuration with the pump function and motor function as described above in connection to the embodiments in fig. 2 and 3 is constituted by a pump/hydraulic motor unit which is arranged to provide an increased energy content in at least one working operation and to recover such increased energy content by means of a motor function via said transmission configuration.
  • Said energy content is arranged to be recovered via a hydraulic medium such as oil included in the pump/hydraulic motor unit.
  • the pump configuration is constituted by a pump/pneumatic motor unit wherein said energy content is arranged to be recovered via a pneumatic medium, such as air, included in the pump/pneumatic motor unit.
  • the electric hybrid system II according to the present invention with a pump configuration arranged by means of a pump function to provide increased energy content in at least one working operation and by means of a motor function via the transmission configuration 120 recover such an increased energy content may include any combination of loads.
  • it may comprise one or more additional pump/motor units arranged parallel to or in series with said pump configuration.
  • it may comprise one or more pump units arranged parallel to or in series with said pump configuration.
  • it may comprise one or more electric machines arranged parallel to said pump configuration.
  • recovery of increased energy content for energy supplying different loads according to desire is facilitated by means of the motor function of the pump configuration via said transmission configuration.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The invention relates to an electric hybrid system for motor vehicles comprising a combustion engine (10), a transmission configuration (20; 120), at least one pump configuration (30) for energy supply of working operations of the vehicle, at least one generator/motor unit (40), an energy storage configuration connected to the generator/motor unit (40), wherein the combustion engine (10) is connected to the transmission configuration for driving, wherein at least one pump configuration (30) is arranged to provide increased energy content of at least one working operation by means a pump function, and to recover such increased energy content by means of a motor function via said transmission configuration (20; 120).

Description

ELECTRIC HYBRID SYSTEM
TECHNICAL FIELD
The invention relates to an electric hybrid system according to the preamble of claim 1 . The invention also relates to a motor vehicle.
BACKGROUND
In construction vehicles such as buckets, dumpers and the like hydraulic systems being driven by any kind of distribution gear coupled to the combustion engine of the vehicle via gear wheel, belt or directly are used.
EP 1793128 A1 shows an electric hybrid system for a construction vehicle with a hybrid drive line comprising a combustion engine, an electric motor/generator, transmission and two hydraulic pumps. The combustion engine is connected to the transmission via a coupling facilitating a disconnection of the combustion engine torque to the transmission. The electric motor is coupled to the transmission via an input/output shaft and may function as both generator when driven by means of the combustion engine and electric motor when supplied with electricity. The hydraulic pumps are coupled to the transmission via an output shaft and may be driven by both the combustion engine and the electric motor.
OBJECT OF THE INVENTION
An object of the present invention is to provide an electric hybrid system which is cost efficient, facilitates energy efficient drive and at the same time requires few components. SUMMARY OF THE INVENTION
These and other objects, apparent from the following description, are achieved by means of an electric hybrid system, which is of the type stated by way of introduction and which in addition exhibits the features recited in the characterising clause of the appended claim 1 . Preferred embodiments of the inventive electric hybrid system are defined in appended dependent claims 2-14.
According to the invention the objects are achieved with an electric hybrid system for motor vehicle comprising a combustion engine, a transmission configuration, at least one pump configuration for energy supply of working operations of the vehicle, at least one generator/motor unit, an energy storage configuration connected to the generator/motor unit, wherein the combustion engine is connected to the transmission configuration for driving, wherein at least one pump configuration is arranged to provide an increased energy content of at least one working operation by means of a pump function, and recover such increased energy content by means of a motor function via said transmission configuration.
Hereby a more energy efficient system is obtained in that the energy may be recovered for use. Further the same pump configuration is used for both pump and motor wherein fewer components are required which may result in a more cost efficient construction and a more compact construction. As the recovery of said increased energy content by means of the motor function of the pump configuration is obtained by means of said transmission configuration, generation of electric energy through transmission to the generator, and/or speeding up of the combustion engine, and/or drive of another pump or other unit is facilitated, wherein thus the system becomes more flexible. According to an embodiment of the electric hybrid system said energy content comprises potential energy. Hereby energy during lifting, tipping of load or the corresponding may be utilized.
According to an embodiment of the electric hybrid system said energy content comprises kinetic energy. Hereby energy during movement of vehicles may be utilized.
According to an embodiment of the electric hybrid system the combustion engine is for driving engagably and disengagably connected to the transmission configuration. According to an embodiment of the electric hybrid system said pump configuration comprises a pump/motor unit. Hereby the same component is utilized for both pumping and hydraulic motor.
According to an embodiment of the electric hybrid system said pump/motor unit is constituted by a pump/hydraulic motor unit. Hereby the pump/motor unit may be utilized during working operations requiring hydraulics.
According to an embodiment of the electric hybrid system said pump function offers variable pump capacity. Hereby a more flexible system and consequently a more efficient system is obtained.
According to an embodiment of the electric hybrid system said motor function offers variable capacity. Hereby a more flexible system and consequently a more efficient system is obtained.
According to an embodiment of the electric hybrid system said at least one working operation includes an excavation function. Hereby more efficient excavation work is facilitated. According to an embodiment of the electric hybrid system said at least one working operation includes a tipping function for a loading platform. Hereby more efficient tipping work is facilitated. According to an embodiment of the electric hybrid system said potential energy is arranged to be recovered via a fluid medium included in the pump configuration.
According to an embodiment of the electric hybrid system said fluid medium is constituted by a hydraulic medium. By utilizing a hydraulic medium such as oil efficient drive of the system is facilitated.
BRIEF DESCRIPTION OF THE DRAWINGS
A better understanding of the present invention will be had upon the reference to the following detailed description when read in conjunction with the accompanying drawings, wherein like reference characters refer to like parts throughout the several views, and in which:
Fig. 1 schematically illustrates a motor vehicle according to an embodiment of the present invention; Fig. 2 schematically illustrates an electric hybrid system according to an embodiment of the present invention;
Fig. 3 schematically illustrates an electric hybrid system according to an embodiment of the present invention.
DETAILED DESCRIPTION
Fig. 1 schematically illustrates a motor vehicle 1 according to an embodiment of the present invention. The motor vehicle 1 is according to an embodiment constituted by a construction vehicle. The motor vehicle 1 in fig. 1 is illustrated as a construction vehicle with tracks 2 for driving the vehicle, a vehicle body 3 rotatable about an essentially vertical axle X the body having a cabin. The vehicle further comprises a bucket 5 for digging/excavation which may be raised and lowered by means of an arm configuration 6 controllable with hydraulic means.
Fig. 2 schematically illustrates an electric hybrid system I according to an embodiment of the present invention. The electric hybrid system I comprises a combustion engine 10, a coupling 12, a transmission configuration 20 and a pump/hydraulic motor unit 30 of variable type. The coupling 12 is connected to the combustion engine 10 via an output shaft 1 1 of the combustion engine. The coupling 12 is arranged in an engaged position to transfer power from the combustion engine 10. The coupling 12 is arranged in a disengaged position to prevent transfer of power from the combustion engine 10.
The coupling 12 is connected to an input shaft 14 of the transmission configuration 20, wherein power from the combustion engine 10 is arranged to be transferred to the input shaft 14 of the transmission configuration 20 when the coupling 12 is in the engaged position, i.e. brought into engagement.
The pump/hydraulic motor unit 30 is connected to an input/output shaft 22 of the transmission configuration 20.
The electric hybrid system I further comprises a generator/motor unit 40 connected to an input/output shaft 24 of the transmission configuration 20, wherein the pump/hydraulic motor unit 30 and the generator/motor unit 40 are arranged parallel relative to the combustion engine 10, i.e. the input/output shaft 22 connected to the pump/hydraulic motor unit 30 is arranged parallel relative to the input/output shaft 24 connected to the generator/motor unit 40.
The generator/motor unit 40 is arranged in a first drive condition to be driven by means of the combustion engine 10, wherein it is arranged to operate as generator. The generator/motor unit 40 is arranged in a second drive condition to receive electric power wherein it is arranged to operate as electric motor.
The electric hybrid system I in addition comprises an energy storage unit 50 for storing electric energy. The energy storage unit 50 may be constituted by a battery unit, a capacitor unit or the like.
The energy storage unit 50 is arranged in the first condition of the generator//motor unit 40 to store electric energy supplied from the generator/motor unit 40 when it operates as generator. The energy storage unit 50 is arranged in the second condition of the generator/motor unit 40 to supply electric power to the generator/motor unit 40 when it operates as electric motor.
The pump/hydraulic motor unit 30 is arranged by means of a pump function to provide increased energy content of a working operation and by means of a hydraulic motor function recover such increased energy content via the transmission configuration 20. Said energy content comprises potential energy and/or kinetic energy.
The pump/hydraulic motor unit 30 is consequently arranged in a first condition to operate as a pump, wherein it is arranged to supply a hydraulic medium for increasing the energy content of a working operation. Hereby the pump/hydraulic motor unit 30 is connected to a load L, which may be constituted by a bucket, loading platform, vehicle body or the corresponding of the vehicle.
The working operation may comprise an excavation or a digging function by means of a bucket or tipping function by means of a loading platform, wherein the energy content comprises potential energy. Hereby said hydraulic medium is arranged to increase the energy content by means of the pump function wherein the hydraulic medium is supplied so that lifting of bucket for digging/excavation, loading platform or the corresponding is provided. The working operation may also comprise a turning function such as turning about an essentially vertical axel of a vehicle body of the vehicle relative to the wheels/tracks of the vehicle, or a drive function for driving of the vehicle, wherein the energy content comprises kinetic energy. Hereby said hydraulic medium is arranged to increase the energy content by means of the pump function wherein the hydraulic medium is supplied such that rotation of the vehicle body of the vehicle, movement of the vehicle or the corresponding is provided.
The pump/hydraulic motor unit 30 is further consequently arranged to in a second condition operate as a hydraulic motor, wherein the energy in said hydraulic medium is recovered during reduction of potential energy where the working operation implies lowering of the bucket for digging/excavation, loading platform or the corresponding and/or reduction of kinetic energy where the working operation implies breaking of rotation of the vehicle body or vehicle movement. Hereby said hydraulic motor function is provided wherein the pump/hydraulic motor unit 30 is arranged to drive the generator/motor unit 40 in its first condition operating as a generator.
The pump/hydraulic motor unit 30 is according to an embodiment variable which results in increased flexibility and consequently a more efficient system. The pump function of the pump/hydraulic motor unit 30 is according to an embodiment variable which results in increased flexibility and consequently more efficient pump function. The hydraulic motor function of the pump/hydraulic motor unit 30 is according to an embodiment variable which results in increased flexibility and consequently more efficient hydraulic motor function.
The transmission configuration 20 comprises a distribution transmission which is controllable for distribution of power.
In the engaged position of the coupling 12 the distribution transmission is controllably arranged to distribute the power from the combustion engine 10 such that in a fist case all power is transferred to the pump/hydraulic motor unit 30, and in a second case a part of the power is transmitted to the pump/hydraulic motor unit 30 and a part of the power to the generator/motor unit 40 when operating as a generator. Further, in the engaged position of the coupling 12, all power may be transferred from the combustion engine 10 to the pump/hydraulic motor unit 30, at the same time as power from the generator/motor unit 40 when operating as an electric motor is transferred to the pump/hydraulic motor unit 30 such that the power being transferred to the pump/hydraulic motor unit 30 amounts to the sum of the power from the combustion engine 10 and the generator/motor unit 40. Hereby more efficient drive of the pump/hydraulic motor unit 30 is facilitated such that when it operates as pump, may pump with higher power.
In the disengaged position of the coupling 12, power may further be transmitted from the generator/motor unit 40 by means of energy from the energy storage unit 50 wherein the generator/motor unit 40 operates as electric motor. The power may be transmitted from the generator/motor unit 40 to the pump/hydraulic motor unit 30 which operates as pump.
In the disengaged position of the coupling, power may further be transmitted from the pump/hydraulic motor unit 30 by means of recovered energy content from a working operation, wherein it operates as hydraulic motor. The power may be transferred from the pump/hydraulic motor unit 30 to the generator/motor unit 40 which operates as generator.
In the disengaged position of the coupling 12 power may also be transferred from the pump/hydraulic motor unit 30, when it operates as a hydraulic motor, to the generator/motor unit 40, at the same time as all power from the combustion engine 10 is transferred to the generator/motor unit 40, where the generator/motor unit 40 operates as generator, wherein the power being transferred to the generator/motor unit 40 amounts up to the sum of the power from the combustion engine 10 and the pump/hydraulic motor unit 30. Hereby is facilitated efficient generation of electric energy for storing in the energy storage unit 50, or for allowing other consumers such as fan for cooling to operate with increased load during a time period, for avoiding intermediate storage losses.
In fig. 2 the power transfer or energy transfer of the electric hybrid system is illustrated with dashed arrows. Hereby power E1 is transferred from the combustion engine to the pump/motor unit 30 as a power E2 and/or to the generator/motor unit 40 as a power E3. Further, when the pump/hydraulic motor unit operates as hydraulic motor, power E4 from the pump/hydraulic motor unit 30 may be transferred to the generator/motor unit 40. In addition, when the generator/motor unit 40 operates as electric motor, power E5 may be transferred from the generator/motor unit 40 to the pump/motor unit 30.
By using a pump/hydraulic motor unit 30 with a pump function and hydraulic motor function only one unit is required for these functions wherein fewer components are required. As increased energy content provided by means of pump function of the pump/hydraulic motor unit 30 is recovered by means of the motor function via the transmission configuration 20 the flexibility of the system is increased in that the pump function may be utilized for both generation of electric energy and possibility to utilizing of drive of desired load and other function such as driving of another pump or the corresponding. This is apparent from the embodiment illustrated in fig. 3.
Fig. 3 schematically illustrates an electric hybrid system II according to an embodiment of the present invention. The electric hybrid system II according to this embodiment differs from the electric hybrid system II according to the embodiment in fig. 2 in that more components are included, wherein the transmission configuration 120 according to this embodiment has more shafts arranged parallel to each other. This illustrates an example of how an electric hybrid system according to the present invention may be constructed.
The electric hybrid system II according to this embodiment comprises a rectifier 1 10 connected to the generator/motor unit 40 and arranged to rectify the alternating voltage from the generator/motor unit 40, and an alternator 1 12 arranged to alternate the continuous voltage from the generator/motor unit 40, which alternator 1 12 is connected to an electric motor 130, which in turn is connected to a drive unit 140 for propulsion of the vehicle. By means of the rectifier 1 10 and the alternator 1 12 voltage and frequency for the electric motor 120 may be controlled, the frequency controlling the rotational speed and the voltage the torque. The energy storage unit 50 is connected to said rectifier 1 10 and alternator 1 12.
The electric hybrid system II according to this embodiment further comprises an additional pump configuration 150 which is arranged in series with the pump/hydraulic motor unit 30, which pump configuration may be arranged for providing hydraulic pressure for e.g. control. The pump/hydraulic motor unit 30 and the pump configuration 150 are connected to a unit 154, which may be constituted by one or several additional pumps.
The electric hybrid system II according to this embodiment also comprises an electric machine 160 connected to an input shaft 162 of the transmission configuration 120, which shaft is parallel to input shaft 1 14 connected to the coupling 12 and to the input/output shaft 122 connected to the hydraulic pump 150 and the pump/hydraulic motor unit 30. The electric machine 160 could constitute an electric motor, or a generator/motor unit. The electric hybrid system II according to this embodiment comprises according to a variant a mechanical drive unit 170, illustrated with a dotted line in fig. 3. The mechanical drive unit 170 comprises an output shaft 172 of the transmission configuration 120 and a mechanical load 174 connected to the output shaft 172, which load may constitute any suitable load such as propulsion, fan, AC-compressor or the corresponding. The output shaft 172 of the transmission configuration 120 connected to the mechanical load 174 is parallel to the input shaft 162 connected to the electric machine 160, parallel to the input/output shaft 24 connected to the generator/motor unit 40 and to the input/output shaft 22 connected to the pump/hydraulic motor 30.
The electric hybrid system II according to this embodiment comprises according to a variant a hydraulic drive unit 180, illustrated with a dotted line in fig. 3. The hydraulic drive unit comprises a hydraulic motor 181 and a shaft 182 of the transmission configuration 120 connected to the hydraulic motor 181 and a load 184 connected to the shaft 182, which load may constitute any suitable load such as additional pumps. The output shaft 182 of the transmission configuration 120 connected to the load 184 is parallel to the input shaft 162 connected to the electric machine 160, parallel to the input/output shaft 24 connected to the generator/motor unit 40, the output shaft 172 connected to the mechanical load 174, and the input/output shaft 22 connected to the pump/hydraulic motor unit 30.
The transmission configuration 120 comprises gear wheels or the corresponding, which are connected to the above mentioned shafts 14, 22, 24, 162, 172, 182 and arranged, when engaged, to transfer power to loads connected to the different shafts. The coupling 12 together with the transmission configuration 120 constitute a summation gear.
When the pump/hydraulic motor unit 30 operates as hydraulic motor, it may consequently recover the, at the pump function, increased energy content via the transmission configuration 20. This energy recovery may be provided in that the power is transferred from the pump/hydraulic motor unit 30 to the generator/motor unit 40 which operates as generator, which may occur both when the combustion engine 10 is engaged, when energy from both the combustion engine 10 and the pump/hydraulic motor 30 operating as hydraulic motor, and the combustion engine 10 is disengaged, when energy from the pump/hydraulic motor unit 30 operating as hydraulic motor is transferred to the generator. Hereby the additional hydraulic motor may also contribute.
Further, the pump/hydraulic motor unit 30, when operating as a hydraulic motor, may transfer the power to the electric machine and/or the mechanical load. Consequently a flexible and efficient electric hybrid system is obtained.
According to a preferred variant the pump/hydraulic motor unit 30 is variable, in accordance with the embodiment in fig. 2.
The pump configuration with the pump function and motor function as described above in connection to the embodiments in fig. 2 and 3 is constituted by a pump/hydraulic motor unit which is arranged to provide an increased energy content in at least one working operation and to recover such increased energy content by means of a motor function via said transmission configuration. Said energy content is arranged to be recovered via a hydraulic medium such as oil included in the pump/hydraulic motor unit. According to an alternative variant the pump configuration is constituted by a pump/pneumatic motor unit wherein said energy content is arranged to be recovered via a pneumatic medium, such as air, included in the pump/pneumatic motor unit.
The electric hybrid system II according to the present invention with a pump configuration arranged by means of a pump function to provide increased energy content in at least one working operation and by means of a motor function via the transmission configuration 120 recover such an increased energy content, may include any combination of loads. For example it may comprise one or more additional pump/motor units arranged parallel to or in series with said pump configuration. Further, it may comprise one or more pump units arranged parallel to or in series with said pump configuration. Further it may comprise one or more electric machines arranged parallel to said pump configuration. Hereby recovery of increased energy content for energy supplying different loads according to desire is facilitated by means of the motor function of the pump configuration via said transmission configuration.
The foregoing description of the preferred embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated.

Claims

1 . Electric hybrid system for motor vehicles comprising a combustion engine (10), a transmission configuration (20; 120), at least one pump configuration (30) for energy supply of working operations of the vehicle, at least one generator/motor unit (40), an energy storage configuration connected to the generator/motor unit (40), wherein the combustion engine (10) is connected to the transmission configuration for driving, characterized in that at least one pump configuration (30) is arranged to provide increased energy content of at least one working operation by means of a pump function, and to recover such increased energy content by means of a motor function via said transmission configuration (20; 120).
2. Electric hybrid system according to claim 1 , wherein said energy content comprises potential energy.
3. Electric hybrid system according to claim 1 or 2, wherein said energy content comprises kinetic energy.
4. Electric hybrid system according to any of claims 1 -3, wherein the combustion engine (10) is for driving engagably and disengagably connected to the transmission configuration (20; 120).
5. Electric hybrid system according to any of claims 1 -4, wherein said pump configuration (30) comprises a pump/motor unit (30).
6. Electric hybrid system according to claim 5, wherein said pump/motor unit (30) is constituted by a pump/hydraulic motor unit.
7. Electric hybrid system according to any of claim 1 -6, wherein said pump function offers variable pump capacity.
8. Electric hybrid system according to any of claim 1 -7, wherein said motor function offers variable capacity.
9. Electric hybrid system according to any of claims 1 -8, wherein said at least one working operation includes an excavation function.
10. Electric hybrid system according to any of claim 1 -9, wherein said at least one working operation includes a tipping function for a loading platform.
1 1 . Electric hybrid system according to any of claim 1 -10, wherein said energy content is arranged to be recovered via a fluid medium included in the pump configuration (30).
12. Electric hybrid system according to claim 1 1 , wherein said fluid medium is constituted by a hydraulic medium.
13. Motor vehicle (1 ) comprising an electric hybrid system (I; II) according to any of claims 1 -12.
PCT/SE2010/051321 2009-12-29 2010-11-30 Electric hybrid system WO2011081593A1 (en)

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JP2013199202A (en) * 2012-03-26 2013-10-03 Kobelco Contstruction Machinery Ltd Power transmission, and hybrid construction machine having the same
FR3055582A1 (en) * 2016-09-07 2018-03-09 Maintenance Du Centre VEHICLE A NACELLE FOR INTERVENTION ON RAILWAY
SE543663C2 (en) * 2019-02-12 2021-05-25 Huddig Ab Arrangement and method for hybrid power generation
GB2558300B (en) * 2016-12-29 2022-06-08 Arrival Ltd Range extender electric vehicle with ancillary device
EP4101992A1 (en) * 2021-06-08 2022-12-14 Renzo Porcellato Building site machine
US11572672B2 (en) 2020-02-21 2023-02-07 Deere & Company Method to decouple engine speed from hydraulic pump speed through an electric motor driven variator

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EP1793128A1 (en) * 2005-06-06 2007-06-06 Shin Caterpillar Mitsubishi Ltd. Drive device for rotation, and working machine

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US20050036894A1 (en) * 2002-07-31 2005-02-17 Hideo Oguri Construction machine
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EP1793128A1 (en) * 2005-06-06 2007-06-06 Shin Caterpillar Mitsubishi Ltd. Drive device for rotation, and working machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013199202A (en) * 2012-03-26 2013-10-03 Kobelco Contstruction Machinery Ltd Power transmission, and hybrid construction machine having the same
FR3055582A1 (en) * 2016-09-07 2018-03-09 Maintenance Du Centre VEHICLE A NACELLE FOR INTERVENTION ON RAILWAY
EP3305562A1 (en) * 2016-09-07 2018-04-11 Maintenance du Centre Vehicle with nacelle for intervention on railway track
GB2558300B (en) * 2016-12-29 2022-06-08 Arrival Ltd Range extender electric vehicle with ancillary device
SE543663C2 (en) * 2019-02-12 2021-05-25 Huddig Ab Arrangement and method for hybrid power generation
US11572672B2 (en) 2020-02-21 2023-02-07 Deere & Company Method to decouple engine speed from hydraulic pump speed through an electric motor driven variator
EP4101992A1 (en) * 2021-06-08 2022-12-14 Renzo Porcellato Building site machine

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