CN110978990B - 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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- CN110978990B CN110978990B CN201911166788.2A CN201911166788A CN110978990B CN 110978990 B CN110978990 B CN 110978990B CN 201911166788 A CN201911166788 A CN 201911166788A CN 110978990 B CN110978990 B CN 110978990B
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- 230000005540 biological transmission Effects 0.000 claims description 34
- 230000001360 synchronised effect Effects 0.000 claims description 28
- 238000011084 recovery Methods 0.000 claims description 9
- 238000010248 power generation Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 claims description 3
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Classifications
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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
- 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 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 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
- 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 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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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
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 power system and a hydraulic hub system. When the vehicle runs on a good road surface and has no larger dynamic requirement, the economy of the whole vehicle can be ensured by utilizing the oil-electricity hybrid power system; when the road surface with lower attachment rate runs or the road surface has power requirements such as climbing a larger gradient, the hydraulic hub system is started to drive the whole vehicle to run in four-wheel drive under the combined drive of two power sources or three power sources, 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 running dynamic property, economy and safety of the whole vehicle, and meanwhile, an additional hydraulic hub system is simple in structure, small in mass and reliable in operation, so that the manufacturing and using cost is further saved.
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, the problems of global resource shortage and environmental pollution are increasingly serious, and a new energy automobile represented by hybrid power can lead the whole automobile to obtain good economical efficiency and emission characteristics through improving the working efficiency of an engine, recycling braking energy and other ways, thereby greatly reducing the demand of the automobile on fossil energy and becoming one of effective ways of energy conservation and emission reduction. Meanwhile, demands for power performance, passing performance and versatility of automobiles are increasing, and a driving system represented by four-wheel drive can well adapt to most road conditions, has excellent driving experience, and particularly has obvious advantages when the automobile runs on a poor road surface such as a low adhesion road surface, so that the automobile is an object which is more prone to be accepted by people. Therefore, development of the four-wheel drive hybrid electric vehicle has important significance for protecting environment, improving energy structure and meeting market demands.
Disclosure of Invention
The invention provides a timely four-wheel drive system of a hybrid electric vehicle, which is characterized in that when the system runs on an excellent road surface, a front axle hydraulic hub system is closed, a rear axle is driven by adopting a set of oil-electricity hybrid power system, so that economical running is performed with the aim of reducing the fuel consumption rate, and the economical efficiency of the system is improved; when a poor road surface is met, the front wheel hydraulic hub system is started, the front wheels are driven by the driven wheels to be driving wheels, and the rear axle is driven unchanged, so that four-wheel drive can be realized, and the dynamic property and the trafficability of the system are enhanced. The system gives consideration to the requirements of the dynamic performance, the trafficability and the economical efficiency of the running of the automobile, and the additionally-arranged hydraulic hub system has the advantages of simple structure, smaller mass and reliable operation, and simultaneously has higher charging and discharging energy speed, thereby further saving the 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: an output shaft of the engine 4 is connected with a clutch 11, and the clutch 11 is connected with an input shaft A of the 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 mechanically connected with the input shaft B of the torque coupler 10; the output shaft of the torque coupler 10 is mechanically connected with the double-clutch automatic transmission 9, and the double-clutch automatic transmission 9 is mechanically connected with the 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 group 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 bank 2, an outer port L1 of the hydraulic control valve bank 2 is connected with input ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, an outer port L2 of the hydraulic control valve bank 2 is connected with output ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, and an outer port L3 of the hydraulic control valve bank 2 is connected with the energy accumulator 3.
The timely four-wheel drive system of the hybrid electric vehicle provided by the invention can adopt different drive modes according to different road conditions and driving requirements: when the road condition is good, an economic driving mode of independently driving the rear wheels is adopted, and the driving mode can be further divided 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 performance is greatly required, a four-wheel co-drive power performance driving mode is adopted, and the four-wheel co-drive power performance driving mode can be further subdivided into a front wheel hydraulic hub drive mode, a rear wheel engine independent driving mode and a front wheel hydraulic hub drive mode and a rear wheel engine motor combined driving mode; a braking energy recovery mode is adopted during braking; the creeping mode of the front wheel driven independently is adopted when the road surface is extremely bad.
(1) Purely 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 the rear wheel drive vehicle through the torque coupler 10, the double clutch automatic transmission 9 and the differential 8;
(2) Engine individual drive mode: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, and the engine 4 transmits energy to the rear wheel drive vehicle through the clutch 11, the torque coupler 10, the double clutch automatic transmission 9 and the differential 8;
(3) Motor-combined drive mode: the hydraulic hub motors 1 and 15 are not operated, 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 two parts of energy are transmitted to the rear wheels through the double clutch automatic transmission 9 and the differential 8 to jointly drive the vehicle after being coupled in the torque coupler 10;
(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 a certain power, and part of energy transmitted to the torque coupler 10 by the engine 4 is converted into electric energy and 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 wheels through the clutch 11, the torque coupler 10, the double clutch automatic transmission 9 and the differential 8; at the same time, 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 so as to drive the front wheels, thereby realizing four-wheel drive;
(6) Front wheel hydraulic hub drive+rear wheel engine motor combined drive mode: the clutch 11 is combined, one part of energy is transmitted to the torque coupler 10 through the clutch 11 by the engine 4, and the other part of energy is transmitted to the permanent magnet synchronous motor 7 through the inverter 5 by the power battery 6 and then transmitted to the torque coupler 10; the two parts of energy are transmitted to the rear wheels through the double clutch automatic transmission 9 and the differential 8 after being coupled in the torque coupler 10; at the same time, 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 so as to drive the front wheels, thereby realizing four-wheel drive;
(7) Braking energy recovery mode: when a driver presses 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, and rear wheel kinetic energy is converted into electric energy in the permanent magnet synchronous motor 7 through the differential mechanism 8 and the torque coupler 10 and then 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 front wheel kinetic energy is stored in the energy accumulator 3 in a punching way;
(8) Creep mode: 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 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 front wheels are driven, and the creeping 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 performance requirement and the economical efficiency requirement of the whole vehicle, and can switch the driving mode according to the driving requirement to provide larger power while meeting the daily economical driving 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 has the advantages of simple structure, smaller mass and reliable operation, and saves the manufacturing cost of the whole vehicle;
3. the timely four-wheel drive system of the hybrid electric vehicle has three power sources, can realize four-wheel drive, and has stronger dynamic property 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 dilemma when meeting severe road conditions or the whole vehicle mechanical transmission system is damaged.
Drawings
FIG. 1 is a schematic diagram of the structure of a timely four-wheel drive system of a hybrid electric vehicle according to the present invention;
FIG. 2 is a power route transmission diagram of a hybrid electric vehicle in a real-time four-wheel drive system in a purely electric drive mode according to the present invention;
FIG. 3 is a power route diagram of a hybrid electric vehicle according to the present invention in a timely four-wheel drive system engine alone drive mode;
FIG. 4 is a power route transmission diagram of a hybrid electric vehicle in a timely four-wheel drive system engine-motor combined drive mode according to the present invention;
FIG. 5 is a power route transmission diagram of a hybrid electric vehicle in a timely four-wheel drive system (HEV) charging (energy) mode according to the present invention;
FIG. 6 is a power route transmission diagram of a hybrid electric vehicle in a timely four-wheel drive system front-wheel hydraulic hub drive+rear-wheel engine single drive mode according to the present invention;
FIG. 7 is a power route transmission diagram of a hybrid electric vehicle in a timely four-wheel drive system front-wheel hydraulic hub drive+rear-wheel engine motor combined drive mode according to the present invention;
FIG. 8 is a power path diagram for a hybrid vehicle in a brake energy recovery mode of a timely four-wheel drive system according to the present invention;
FIG. 9 is a power route transmission diagram of a hybrid electric vehicle in a creep mode of a timely four-wheel drive system according to the present invention;
The reference numerals in the figures illustrate: 1. the right front wheel hub hydraulic motor, 2a hydraulic control valve group, 3 an energy accumulator, 4 an engine, 5 an inverter, 6a power battery, 7a differential, 8a dual 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, 14 and a left front wheel hub hydraulic motor.
Detailed Description
Embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar physical quantities or physical quantities having the same or similar meanings. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, integrally connected, or detachably connected, for example; can be mechanical connection or communication between two elements; may be directly connected or indirectly connected through an intermediate medium, and the specific meaning of the above terms will be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, the timely four-wheel drive system of the 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: an output shaft of the engine 4 is connected with a clutch 11, and the clutch 11 is connected with an input shaft A of the 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 mechanically connected with the input shaft B of the torque coupler 10; the output shaft of the torque coupler 10 is mechanically connected with the double-clutch automatic transmission 9, and the double-clutch automatic transmission 9 is mechanically connected with the 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 group 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 bank 2, an outer port L1 of the hydraulic control valve bank 2 is connected with input ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, an outer port L2 of the hydraulic control valve bank 2 is connected with output ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, and an outer port L3 of the hydraulic control valve bank 2 is connected with the energy accumulator 3.
Referring to fig. 1, the timely four-wheel driving system of the hybrid electric vehicle can adopt a two-wheel driving or four-wheel driving mode according to different road conditions and driving requirements, and 8 different working modes such as a pure electric driving mode, an engine independent driving mode, an engine motor combined driving mode, a driving charging mode, a front wheel hydraulic hub driving, a rear wheel engine independent driving mode, a front wheel hydraulic hub driving, a rear wheel engine motor combined driving mode, a braking energy recovery mode, a creeping mode and the like can be realized.
Referring to fig. 2, when the whole vehicle starts, a pure electric driving 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 the rear wheel driving 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, when the whole vehicle runs on a middle-high speed road section, an engine independent driving mode can be adopted: the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, and the engine 4 transmits energy to the 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 surface with a high attachment rate and needs power, an engine-motor combined driving mode may be adopted: the hydraulic hub motors 1 and 15 are not operated, 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 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 jointly drive a vehicle, and the dynamic property of the whole vehicle is improved through double-dynamic-source combined driving;
referring to fig. 5, when the energy stored in the whole vehicle power battery 6 or the energy accumulator 3 is lower than a certain value or the power in the optimal working interval of the engine is greater than the actually required power, a driving charging (energy) mode may 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 a certain power, and part of energy transmitted to the torque coupler 10 by the engine 4 is converted into electric energy and 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 rate or has a large power requirement, a front wheel hydraulic hub driving+rear wheel engine independent driving mode can be adopted: the clutch 11 is combined, and the engine 4 transmits energy to the rear wheels 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 front wheels, thereby realizing four-wheel drive and improving the dynamic property and the trafficability of the whole vehicle;
Referring to fig. 7, when the whole vehicle ascends on a road surface with a smaller attachment rate or has a great requirement on power, such as climbing a road surface with a larger gradient, 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 through the clutch 11 by the engine 4, and the other part of energy is transmitted to the permanent magnet synchronous motor 7 through the inverter 5 by the power battery 6 and then transmitted to the torque coupler 10; the two parts of energy are transmitted to the rear wheels through the double clutch automatic transmission 9 and the differential 8 after being coupled in the torque coupler 10; 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 front wheels, thereby realizing four-wheel drive by simultaneously working three power sources 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, and the rear wheel kinetic energy is converted into electric energy in the permanent magnet synchronous motor 7 through the differential mechanism 8 and the torque coupler 10 and then 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 front wheel kinetic energy is stored in the energy accumulator 3 in a stamping way, so that the kinetic energy is converted into electric energy or hydraulic energy, and the whole kinetic energy is prevented from being converted into friction heat energy to be dissipated, so that the economy of the whole vehicle is improved;
Referring to fig. 9, when the vehicle is running on a road surface with low adhesion rate or the mechanical transmission system of the whole vehicle is damaged, a 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 after passing 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 low-speed creeping movement is realized to get rid of dilemma, and the running safety of the whole vehicle is improved.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (1)
1. A timely four-wheel driving method of a hybrid electric vehicle comprises a timely four-wheel driving system of the hybrid electric vehicle, wherein the timely four-wheel driving system of the 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: an 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 (10); 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 mechanically connected with the input shaft B of the torque coupler (10); the output shaft of the torque coupler (10) is mechanically connected with the double-clutch automatic transmission (9), and the double-clutch automatic transmission (9) is mechanically connected with the differential mechanism (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 group (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); the hydraulic variable pump (14) is connected with the hydraulic control valve bank (2), an outer port L1 of the hydraulic control valve bank (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), an outer port L2 of the hydraulic control valve bank (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 an outer port L3 of the hydraulic control valve bank (2) is connected with the energy accumulator (3);
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 8 different working modes of a pure electric drive mode, an engine independent drive mode, an engine motor combined drive mode, a traveling charging mode, a front wheel hydraulic hub drive and rear wheel engine independent drive mode, a front wheel hydraulic hub drive and rear wheel engine motor combined drive mode, a braking energy recovery mode and a creeping mode can be realized altogether:
(1) Purely electric drive mode: the engine (4) does not work with the right front wheel hub hydraulic motor (1) and the left front wheel hub hydraulic motor (15), the power battery (6) transmits energy to the permanent magnet synchronous motor (7) through the inverter (5), and then the energy is transmitted to the rear wheel driving vehicle after passing through the torque coupler (10), the double clutch automatic transmission (9) and the differential mechanism (8);
(2) Engine individual drive mode: the right front wheel hub hydraulic motor (1) and the left front wheel hub hydraulic motor (15) do not work, the clutch (11) is combined, and the engine (4) transmits energy to the rear wheel driving vehicle after passing through the clutch (11), the torque coupler (10), the double clutch automatic transmission (9) and the differential mechanism (8);
(3) Motor-combined drive mode: the right front wheel hub hydraulic motor (1) and the left front wheel hub hydraulic motor (15) do not work, the clutch (11) is combined, one part of energy is transmitted to the torque coupler (10) through the clutch (11) by the engine (4), and the other part of energy is transmitted to the permanent magnet synchronous motor (7) through the inverter (5) by the power battery (6) and then is 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 mechanism (8) to jointly drive the vehicle;
(4) Driving charging/energy mode: the right front wheel hub hydraulic motor (1) and the left front wheel hub hydraulic motor (15) do not work, the clutch (11) is combined, part of energy is transmitted to the torque coupler (10) through the clutch (11) by the engine (4), then the energy is transmitted to the rear wheel through the double clutch automatic transmission (9) and the differential mechanism (8), meanwhile, the permanent magnet synchronous motor (7) also works in a power generation state with a 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 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 wheels through the clutch (11), the torque coupler (10), the double-clutch automatic transmission (9) and the differential mechanism (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;
(6) Front wheel hydraulic hub drive+rear wheel engine motor combined drive mode: the clutch (11) is combined, one part of energy is transmitted to the torque coupler (10) through the clutch (11) by the engine (4), and the other part of energy is transmitted to the permanent magnet synchronous motor (7) through the inverter (5) by the power battery (6) and then transmitted to the torque coupler (10); the two parts of energy are coupled in a torque coupler (10) and then transmitted to the rear wheel through a double clutch automatic transmission (9) and a differential mechanism (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;
(7) Braking energy recovery mode: when a driver presses 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, and rear wheel kinetic energy is converted into electric energy in the permanent magnet synchronous motor (7) through the differential mechanism (8) and the torque coupler (10) and then 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 front wheel kinetic energy is stored in the energy accumulator (3) in a punching way;
(8) Creep mode: the clutch (11) is disconnected, and 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) after passing 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 front wheels are driven, and a creeping mode is realized.
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