CN110978990A - Timely four-wheel drive system of hybrid electric vehicle - Google Patents
Timely four-wheel drive system of hybrid electric vehicle Download PDFInfo
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- CN110978990A CN110978990A CN201911166788.2A CN201911166788A CN110978990A CN 110978990 A CN110978990 A CN 110978990A CN 201911166788 A CN201911166788 A CN 201911166788A CN 110978990 A CN110978990 A CN 110978990A
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- 238000011084 recovery Methods 0.000 claims description 9
- 238000010248 power generation Methods 0.000 claims description 6
- 230000009193 crawling Effects 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 4
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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
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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
- B60K25/00—Auxiliary drives
- B60K25/02—Auxiliary drives directly from an engine shaft
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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
- B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
- B60K6/52—Driving a plurality of drive axles, e.g. four-wheel drive
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- 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
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
- B60L7/16—Dynamic electric regenerative braking for vehicles comprising converters between the power source and the motor
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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
- B60K25/00—Auxiliary drives
- B60K25/02—Auxiliary drives directly from an engine shaft
- B60K2025/026—Auxiliary drives directly from an engine shaft by a hydraulic transmission
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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
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses a timely four-wheel drive system of a hybrid electric vehicle, which relates to the technical field of hybrid electric vehicles and comprises an oil-electricity hybrid electric system and a hydraulic hub system. When the vehicle runs on a good road surface and does not have a large power demand, the economy of the whole vehicle can be ensured by utilizing the oil-electricity hybrid power system; when the vehicle runs on a road surface with low adhesion rate or has power requirements such as climbing a large slope, the whole vehicle can be driven by two power sources or three power sources in a combined manner to carry out four-wheel drive running by starting the hydraulic hub system, so that the running safety and the power performance of the whole vehicle are improved; the timely four-wheel drive system of the hybrid electric vehicle ensures the driving power, economy and safety of the whole vehicle, and meanwhile, the additional set of hydraulic wheel hub system has simple structure, smaller mass and reliable work, thereby further saving the manufacturing and using cost.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to a timely four-wheel drive system of a hybrid electric vehicle.
Background
In recent years, global resource shortage and environmental pollution are increasingly serious, and new energy automobiles represented by hybrid power can enable the whole automobiles to obtain good economical efficiency and emission characteristics through ways of improving the working efficiency of engines, recycling regenerative braking energy and the like, greatly reduce the requirements of the automobiles on fossil energy and become one of effective ways of energy conservation and emission reduction. Meanwhile, the requirements of people on the dynamic property, the trafficability property and the versatility of automobiles are increasing day by day, a driving system represented by four-wheel drive can be well adapted to most road conditions, the driving experience is excellent, and particularly, when the driving is poor on a low-attachment road, the advantages of the four-wheel drive system are obvious, so that the four-wheel drive system becomes an object which people tend to accept more. Therefore, the development of the four-wheel drive hybrid electric vehicle has important significance for protecting the environment, improving the energy structure and complying with the market demand.
Disclosure of Invention
The invention provides a timely four-wheel drive system of a hybrid electric vehicle, when the system runs on a good road surface, a front axle hydraulic hub system is closed, and a rear axle is driven by adopting a set of oil-electricity hybrid power system, so that economic running is carried out with the aim of reducing the fuel consumption rate, and the economical efficiency of the system is improved; when the road is poor, the front wheel hydraulic hub system is started, the front wheel is driven by the driven wheel to be the driving wheel, and the rear axle is not changed in driving, so that four-wheel driving can be realized, and the dynamic property and the trafficability of the system are enhanced. The system has the advantages that the driving power, the passing performance and the economical demand of the automobile are taken into consideration, the additionally arranged hydraulic hub system is simple in structure, small in quality, reliable in work, high in charging and discharging speed and capable of saving manufacturing and using costs.
The invention is realized by adopting the following technical scheme:
a timely four-wheel drive system of a hybrid electric vehicle comprises an oil-electricity hybrid power system and a hydraulic hub system.
The oil-electricity hybrid power system comprises an engine 4, a clutch 11, a permanent magnet synchronous motor 7, an inverter 5, a power battery 6, a torque coupler 10, a double-clutch automatic transmission 9 and a differential 8; the oil-electricity hybrid power system is characterized in that: the output shaft of the engine 4 is connected with a clutch 11, and the clutch 11 is connected with an input shaft A of a torque coupler 9; the power battery 6 is in circuit connection with the inverter 5, the inverter 5 is in circuit connection with the permanent magnet synchronous motor 7, and the permanent magnet synchronous motor 7 is in mechanical connection with an input shaft B of the torque coupler 10; an output shaft of the torque coupler 10 is mechanically connected with a double-clutch automatic transmission 9, and the double-clutch automatic transmission 9 is mechanically connected with a differential 8.
The hydraulic hub system comprises a hydraulic variable pump 14, a power takeoff 12, a power takeoff output shaft 13, an energy accumulator 3, a hydraulic control valve bank 2, a left front wheel hub hydraulic motor 15 and a right front wheel hub hydraulic motor 1; the hydraulic hub system is characterized in that: the power takeoff 12 is connected with a hydraulic variable pump 14 through a power takeoff output shaft 13; the hydraulic variable pump 14 is connected with the hydraulic control valve group 2, the outer port L1 of the hydraulic control valve group 2 is connected with the input ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, the outer port L2 of the hydraulic control valve group 2 is connected with the output ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, and the outer port L3 of the hydraulic control valve group 2 is connected with the energy accumulator 3.
The timely four-wheel drive system of the hybrid electric vehicle can adopt different drive modes according to different road conditions and driving requirements: when the road condition is good, an economical driving mode of independently driving the rear wheels is adopted, and the economical driving mode can be further subdivided into a pure electric driving mode, an engine independent driving mode, an engine and motor combined driving mode and a driving charging mode; when the power property is greatly required, a power property running mode of four-wheel common drive is adopted, and the mode can be further subdivided into a front wheel hydraulic hub drive and rear wheel engine independent drive mode and a front wheel hydraulic hub drive and rear wheel engine motor combined drive mode; a braking energy recovery mode is adopted during braking; when extremely bad road surface is encountered, a creeping mode of driving the front wheels independently is adopted.
(1) Pure electric drive mode: the engine 4 and the hydraulic hub motors 1 and 15 do not work, and the power battery 6 transfers energy to the permanent magnet synchronous motor 7 through the inverter 5, and then transfers the energy to a rear wheel drive vehicle after passing through the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8;
(2) engine-only drive mode: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, and the engine 4 transmits energy to a rear wheel drive vehicle through the clutch 11, the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8;
(3) the engine and motor combined driving mode comprises the following steps: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, one part of energy is transmitted to the torque coupler 10 from the engine 4 through the clutch 11, the other part of energy is transmitted to the permanent magnet synchronous motor 7 from the power battery 6 through the inverter 5 and then transmitted to the torque coupler 10; after being coupled in a torque coupler 10, the two parts of energy are transmitted to a rear wheel together through a double-clutch automatic transmission 9 and a differential 8 to drive the vehicle;
(4) driving charging (energy) mode: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, the engine 4 transmits part of energy to the torque coupler 10 after passing through the clutch 11, then the energy is transmitted to the rear wheel after passing through the double-clutch automatic transmission 9 and the differential 8, meanwhile, the permanent magnet synchronous motor 7 also works in a power generation state with certain power, and part of the energy transmitted to the torque coupler 10 by the engine 4 is converted into electric energy which is stored in the power battery 6 through the inverter 5; the engine 4 transmits the other part of energy to the energy accumulator 3 through the power takeoff 12, the power takeoff output shaft 13, the hydraulic variable pump 14 and the hydraulic control valve group 2;
(5) front wheel hydraulic hub drive + rear wheel engine individual drive mode: the clutch 11 is combined, and the engine 4 transmits energy to the rear wheel through the clutch 11, the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8; meanwhile, the accumulator 3 drives the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 through the hydraulic control valve group 2 to drive the front wheels, thereby realizing four-wheel drive;
(6) the front wheel hydraulic wheel hub driving and rear wheel engine motor combined driving mode is as follows: the clutch 11 is combined, one part of energy is transmitted to the torque coupler 10 by the engine 4 through the clutch 11, and the other part of energy is transmitted to the permanent magnet synchronous motor 7 by the power battery 6 through the inverter 5 and then transmitted to the torque coupler 10; after being coupled in a torque coupler 10, the energy of the two parts is transmitted to rear wheels through a double-clutch automatic transmission 9 and a differential 8; meanwhile, the accumulator 3 drives the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 through the hydraulic control valve group 2 to drive the front wheels, thereby realizing four-wheel drive;
(7) a braking energy recovery mode: when a driver steps on a brake pedal, the whole vehicle is switched to a brake energy recovery mode, the permanent magnet synchronous motor 7 works in a power generation state, the kinetic energy of the rear wheels is converted into electric energy in the permanent magnet synchronous motor 7 through the differential 8 and the torque coupler 10, and then the electric energy is stored in the power battery 6 through the inverter 5; meanwhile, the energy accumulator 3 can also be used as an energy storage component, and the energy accumulator brought by the kinetic energy of the front wheel is punched and stored in the energy accumulator 3;
(8) creeping mode: the clutch 11 is disconnected, and the energy of the engine 4 is transmitted to the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 through the power takeoff 12, the power takeoff output shaft 13, the hydraulic variable pump 14 and the hydraulic control valve group 2 respectively so as to drive the front wheels, so that the crawling mode is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. the timely four-wheel drive system of the hybrid electric vehicle can solve the contradiction between the power demand and the economic demand of the whole vehicle, and can switch the drive form according to the running demand to provide larger power while meeting the daily economic running of the whole vehicle;
2. the set of hub hydraulic system additionally arranged in the timely four-wheel drive system of the hybrid electric vehicle is simple in structure, small in mass and reliable in operation, and the manufacturing cost of the whole vehicle is saved;
3. the timely four-wheel drive system of the hybrid electric vehicle has three power sources, can realize four-wheel drive, and has stronger power performance compared with the traditional single power source four-wheel drive vehicle;
4. the timely four-wheel drive system of the hybrid electric vehicle can realize a creeping mode through the hydraulic hub system of the front wheel, and can realize low-speed creeping movement to get rid of the dilemma when the road is in severe road conditions or the whole vehicle mechanical transmission system is damaged.
Drawings
FIG. 1 is a schematic structural diagram of a four-wheel drive system for a hybrid electric vehicle according to the present invention;
FIG. 2 is a power path transmission diagram of a hybrid electric vehicle in a pure electric drive mode of a timely four-wheel drive system;
FIG. 3 is a power transmission diagram of a hybrid electric vehicle in a single engine driving mode of a timely four-wheel drive system;
FIG. 4 is a power transmission diagram of the hybrid electric vehicle in the engine-motor combined driving mode of the timely four-wheel driving system according to the present invention;
FIG. 5 is a power transmission diagram of a hybrid electric vehicle in a charging mode of a four-wheel drive system;
FIG. 6 is a power transmission diagram of a hybrid electric vehicle in a front wheel hydraulic hub driving and rear wheel engine single driving mode of a timely four-wheel driving system according to the present invention;
FIG. 7 is a power path transmission diagram of a hybrid electric vehicle in a front wheel hydraulic hub driving and rear wheel engine motor combined driving mode of a timely four-wheel driving system according to the present invention;
FIG. 8 is a power transmission diagram of a hybrid electric vehicle in a braking energy recovery mode of a four-wheel drive system at the right time according to the present invention;
FIG. 9 is a power transmission diagram of a hybrid electric vehicle in a creep mode of a four-wheel drive system in due time according to the present invention;
the reference numbers in the figures illustrate: 1. the hydraulic control system comprises a right front wheel hub hydraulic motor, 2. a hydraulic control valve group, 3. an energy accumulator, 4. an engine, 5. an inverter, 6. a power battery, 7. a differential, 8. a double-clutch automatic transmission, 9. a permanent magnet synchronous motor, 10. a clutch, 11. a power takeoff, 12. a power takeoff output shaft, 13. a hydraulic variable pump and 14. a left front wheel hub hydraulic motor.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar designations denote like or similar physical quantities or quantities with like or similar meanings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; can be mechanically connected or can be the communication between the two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art will understand the specific meanings of the above terms according to specific situations.
Referring to fig. 1, the hybrid electric vehicle timely four-wheel drive system includes an oil-electric hybrid system and a hydraulic hub system.
The oil-electricity hybrid power system comprises an engine 4, a clutch 11, a permanent magnet synchronous motor 7, an inverter 5, a power battery 6, a torque coupler 10, a double-clutch automatic transmission 9 and a differential 8; the oil-electricity hybrid power system is characterized in that: the output shaft of the engine 4 is connected with a clutch 11, and the clutch 11 is connected with an input shaft A of a torque coupler 9; the power battery 6 is in circuit connection with the inverter 5, the inverter 5 is in circuit connection with the permanent magnet synchronous motor 7, and the permanent magnet synchronous motor 7 is in mechanical connection with an input shaft B of the torque coupler 10; an output shaft of the torque coupler 10 is mechanically connected with a double-clutch automatic transmission 9, and the double-clutch automatic transmission 9 is mechanically connected with a differential 8.
The hydraulic hub system comprises a hydraulic variable pump 14, a power takeoff 12, a power takeoff output shaft 13, an energy accumulator 3, a hydraulic control valve bank 2, a left front wheel hub hydraulic motor 15 and a right front wheel hub hydraulic motor 1; the hydraulic hub system is characterized in that: the power takeoff 12 is connected with a hydraulic variable pump 14 through a power takeoff output shaft 13; the hydraulic variable pump 14 is connected with the hydraulic control valve group 2, the outer port L1 of the hydraulic control valve group 2 is connected with the input ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, the outer port L2 of the hydraulic control valve group 2 is connected with the output ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, and the outer port L3 of the hydraulic control valve group 2 is connected with the energy accumulator 3.
Referring to fig. 1, the timely four-wheel drive system of the hybrid electric vehicle can adopt a two-wheel drive or four-wheel drive mode according to different road conditions and driving requirements, and can realize 8 different working modes such as a pure electric drive mode, an engine independent drive mode, an engine and motor combined drive mode, a driving charging mode, a front wheel hydraulic wheel hub drive and rear wheel engine independent drive mode, a front wheel hydraulic wheel hub drive and rear wheel engine and motor combined drive mode, a braking energy recovery mode and a crawling mode.
Referring to the attached figure 2, when the whole vehicle starts, a pure electric drive mode can be adopted: the engine 4 and the hydraulic hub motors 1 and 15 do not work, the power battery 6 transmits energy to the permanent magnet synchronous motor 7 through the inverter 5, and then the energy is transmitted to a rear wheel drive vehicle through the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8, so that quick and stable starting is realized;
referring to fig. 3, an engine-only driving mode may be adopted when the entire vehicle travels at a middle-high speed section: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, and the engine 4 transmits energy to a rear wheel drive vehicle through the clutch 11, the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8;
referring to fig. 4, when the whole vehicle is on a road with a high adhesion rate and needs power, an engine-motor combined driving mode can be adopted: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, one part of energy is transmitted to the torque coupler 10 from the engine 4 through the clutch 11, the other part of energy is transmitted to the permanent magnet synchronous motor 7 from the power battery 6 through the inverter 5 and then transmitted to the torque coupler 10; the two parts of energy are coupled in a torque coupler 10 and then transmitted to a rear wheel through a double-clutch automatic transmission 9 and a differential 8 to drive the vehicle together, and the dynamic property of the whole vehicle is improved through the combined driving of double power sources;
referring to the attached figure 5, when the energy stored in the power battery 6 or the energy accumulator 3 of the whole vehicle is lower than a certain value or the power of the optimal working interval of the engine is higher than the actually required power, a driving charging (energy) mode can be adopted: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, the engine 4 transmits part of energy to the torque coupler 10 after passing through the clutch 11, then the energy is transmitted to the rear wheel after passing through the double-clutch automatic transmission 9 and the differential 8, meanwhile, the permanent magnet synchronous motor 7 also works in a power generation state with certain power, and part of the energy transmitted to the torque coupler 10 by the engine 4 is converted into electric energy which is stored in the power battery 6 through the inverter 5; the engine 4 transmits the other part of energy to the energy accumulator 3 through the power takeoff 12, the power takeoff output shaft 13, the hydraulic variable pump 14 and the hydraulic control valve group 2;
referring to fig. 6, when the whole vehicle runs on a road surface with a low attachment ratio or has a large demand for power, a front wheel hydraulic hub driving and rear wheel engine single driving mode can be adopted: the clutch 11 is combined, and the engine 4 transmits energy to the rear wheel through the clutch 11, the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8; meanwhile, the energy accumulator 3 drives the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 through the hydraulic control valve group 2 so as to drive the front wheels, thereby realizing four-wheel drive and improving the dynamic property and the trafficability property of the whole vehicle;
referring to the attached drawing 7, when the whole vehicle travels on a road surface with a small attachment ratio or has a great demand for power such as climbing a road surface with a large slope, a front wheel hydraulic hub driving and rear wheel engine motor combined driving mode can be adopted: the clutch 11 is combined, one part of energy is transmitted to the torque coupler 10 by the engine 4 through the clutch 11, and the other part of energy is transmitted to the permanent magnet synchronous motor 7 by the power battery 6 through the inverter 5 and then transmitted to the torque coupler 10; after being coupled in a torque coupler 10, the energy of the two parts is transmitted to rear wheels through a double-clutch automatic transmission 9 and a differential 8; meanwhile, the energy accumulator 3 drives the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 through the hydraulic control valve group 2 so as to drive the front wheels, thereby realizing the simultaneous work of three power sources to realize four-wheel drive and outputting power with the maximum power of the whole vehicle;
referring to FIG. 8, when the driver depresses the brake pedal, a braking energy recovery mode may be employed: the permanent magnet synchronous motor 7 works in a power generation state, kinetic energy of a rear wheel is converted into electric energy in the permanent magnet synchronous motor 7 through the differential 8 and the torque coupler 10, and then the electric energy is stored in the power battery 6 through the inverter 5; meanwhile, the energy accumulator 3 can also be used as an energy storage component, and the energy accumulator brought by the kinetic energy of the front wheel is punched and stored in the energy accumulator 3, so that the kinetic energy is converted into electric energy or hydraulic energy, and the whole energy is prevented from being converted into friction heat energy to be dissipated, and the economy of the whole vehicle is improved;
referring to fig. 9, when the vehicle runs on a road with low adhesion rate or the transmission system of the whole vehicle is damaged, the creeping mode can be adopted: the clutch 11 is disconnected, and the energy of the engine 4 is respectively transmitted to the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 to drive the front wheels through the power takeoff 12, the power takeoff output shaft 13, the hydraulic variable pump 14 and the hydraulic control valve group 2, so that the low-speed crawling movement is realized to get rid of the trouble, and the driving safety of the whole vehicle is improved.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (2)
1. The utility model provides a timely four wheel drive system of hybrid vehicle, includes oil-electricity hybrid power system and hydraulic pressure wheel hub system, its characterized in that:
the oil-electricity hybrid power system comprises an engine (4), a clutch (11), a permanent magnet synchronous motor (7), an inverter (5), a power battery (6), a torque coupler (10), a double-clutch automatic transmission (9) and a differential (8); the oil-electricity hybrid power system is characterized in that: the output shaft of the engine (4) is connected with a clutch (11), and the clutch (11) is connected with an input shaft A of a torque coupler (9); the power battery (6) is in circuit connection with the inverter (5), the inverter (5) is in circuit connection with the permanent magnet synchronous motor (7), and the permanent magnet synchronous motor (7) is in mechanical connection with an input shaft B of the torque coupler (10); an output shaft of the torque coupler (10) is mechanically connected with a double-clutch automatic transmission (9), and the double-clutch automatic transmission (9) is mechanically connected with a differential (8);
the hydraulic hub system comprises a hydraulic variable pump (14), a power takeoff (12), a power takeoff output shaft (13), an energy accumulator (3), a hydraulic control valve bank (2), a left front wheel hub hydraulic motor (15) and a right front wheel hub hydraulic motor (1); the hydraulic hub system is characterized in that: the power takeoff (12) is connected with the hydraulic variable pump (14) through a power takeoff output shaft (13); hydraulic pressure variable pump (14) are connected with hydraulic control valves (2), and the outer port L1 of hydraulic control valves (2) is connected with left front wheel hub hydraulic motor (15) and right front wheel hub hydraulic motor's (1) input, and the outer port L2 of hydraulic control valves (2) is connected with the output of left front wheel hub hydraulic motor (15) and right front wheel hub hydraulic motor (1), and the outer port L3 of hydraulic control valves (2) is connected with energy storage ware (3).
2. The timely four-wheel drive system of a hybrid electric vehicle as claimed in claim 1, wherein the timely four-wheel drive system of a hybrid electric vehicle can adopt a two-wheel drive or four-wheel drive mode according to different road conditions and driving requirements, and can realize 8 different working modes such as a pure electric drive mode, an engine single drive mode, an engine-motor combined drive mode, a driving charging mode, a front wheel hydraulic hub drive + rear wheel engine single drive mode, a front wheel hydraulic hub drive + rear wheel engine-motor combined drive mode, a braking energy recovery mode, a crawling mode and the like:
(1) pure electric drive mode: the engine (4) and the hydraulic hub motors (1) and (15) do not work, the power battery (6) transmits energy to the permanent magnet synchronous motor (7) through the inverter (5), and then the energy is transmitted to a rear wheel drive vehicle through the torque coupler (10), the double-clutch automatic transmission (9) and the differential (8);
(2) engine-only drive mode: the hydraulic hub motors (1) and (15) do not work, the clutch (11) is combined, and the engine (4) transmits energy to a rear wheel drive vehicle through the clutch (11), the torque coupler (10), the double-clutch automatic transmission (9) and the differential (8);
(3) the engine and motor combined driving mode comprises the following steps: the hydraulic hub motors (1) and (15) do not work, the clutch (11) is combined, one part of energy is transmitted to the torque coupler (10) by the engine (4) through the clutch (11), and the other part of energy is transmitted to the permanent magnet synchronous motor (7) by the power battery (6) through the inverter (5) and then transmitted to the torque coupler (10); after being coupled in a torque coupler (10), the energy of the two parts is transmitted to a rear wheel through a double-clutch automatic transmission (9) and a differential (8) to jointly drive the vehicle;
(4) driving charging (energy) mode: the hydraulic hub motors (1) and (15) do not work, the clutch (11) is combined, the engine (4) transmits part of energy to the torque coupler (10) through the clutch (11), and then transmits the energy to the rear wheel through the double-clutch automatic transmission (9) and the differential (8), meanwhile, the permanent magnet synchronous motor (7) works in a power generation state with certain power, part of energy transmitted to the torque coupler (10) by the engine (4) is converted into electric energy, and the electric energy is stored in the power battery (6) through the inverter (5); the engine (4) transmits the other part of energy to the energy accumulator (3) through the power takeoff (12), the power takeoff output shaft (13), the hydraulic variable pump (14) and the hydraulic control valve bank (2);
(5) front wheel hydraulic hub drive + rear wheel engine individual drive mode: the clutch (11) is combined, and the engine (4) transmits energy to the rear wheel through the clutch (11), the torque coupler (10), the double-clutch automatic transmission (9) and the differential (8); meanwhile, the accumulator (3) drives a left front wheel hub hydraulic motor (15) and a right front wheel hub hydraulic motor (1) through the hydraulic control valve group (2) so as to drive the front wheel, and therefore four-wheel drive is achieved;
(6) the front wheel hydraulic wheel hub driving and rear wheel engine motor combined driving mode is as follows: the clutch (11) is combined, one part of energy is transmitted to the torque coupler (10) by the engine (4) through the clutch (11), and the other part of energy is transmitted to the permanent magnet synchronous motor (7) by the power battery (6) through the inverter (5) and then transmitted to the torque coupler (10); the energy of the two parts is coupled in a torque coupler (10) and then transmitted to rear wheels through a double-clutch automatic transmission (9) and a differential (8); meanwhile, the accumulator (3) drives a left front wheel hub hydraulic motor (15) and a right front wheel hub hydraulic motor (1) through the hydraulic control valve group (2) so as to drive the front wheel, and therefore four-wheel drive is achieved;
(7) a braking energy recovery mode: when a driver steps on a brake pedal, the whole vehicle is switched to a brake energy recovery mode, the permanent magnet synchronous motor (7) works in a power generation state, the kinetic energy of the rear wheels is converted into electric energy in the permanent magnet synchronous motor (7) through a differential mechanism (8) and a torque coupler (10), and then the electric energy is stored in a power battery (6) through an inverter (5); meanwhile, the energy accumulator (3) can also be used as an energy storage component, and the energy accumulator brought by the kinetic energy of the front wheel is punched and stored in the energy accumulator (3);
(8) creeping mode: the clutch (11) is disconnected, and the energy of the engine (4) is transmitted to the left front wheel hub hydraulic motor (15) and the right front wheel hub hydraulic motor (1) through the power takeoff (12), the power takeoff output shaft (13), the hydraulic variable pump (14) and the hydraulic control valve group (2) to drive the front wheels, so that the crawling mode is realized.
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