CN110667368A - Hybrid power system of four-wheel drive vehicle and working method - Google Patents

Hybrid power system of four-wheel drive vehicle and working method Download PDF

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Publication number
CN110667368A
CN110667368A CN201910984219.2A CN201910984219A CN110667368A CN 110667368 A CN110667368 A CN 110667368A CN 201910984219 A CN201910984219 A CN 201910984219A CN 110667368 A CN110667368 A CN 110667368A
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China
Prior art keywords
motor
engine
power
clutch
transmitted
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CN201910984219.2A
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Chinese (zh)
Inventor
陈红涛
杨建军
张先锋
白巴特尔
聂国乐
牛亚卓
安世佳
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China Automotive Technology and Research Center Co Ltd
CATARC Tianjin Automotive Engineering Research Institute Co Ltd
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China Automotive Technology and Research Center Co Ltd
CATARC Tianjin Automotive Engineering Research Institute Co Ltd
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Priority to CN201910984219.2A priority Critical patent/CN110667368A/en
Publication of CN110667368A publication Critical patent/CN110667368A/en
Pending legal-status Critical Current

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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
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
    • B60K6/365—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings with the gears having orbital motion
    • 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
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/24—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the combustion engines
    • 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
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • 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
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/38—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the driveline clutches
    • 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
    • B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a four-wheel drive vehicle hybrid power system, which comprises an engine, a first clutch, an engine power input shaft, a driven gear, a driving gear, a first motor, a second clutch, a front main reduction driving gear, a front main reduction driven gear, a front differential mechanism, a second motor, a rear main reduction driving gear, a rear main reduction driven gear and a rear differential mechanism, wherein the structure is simple; two clutches are arranged in the front power coupling box, so that 3 pure electric driving modes can be realized, and 9 modes including 3 parallel driving modes, engine direct driving, series connection and parking power generation modes are provided, and the system redundancy is increased.

Description

Hybrid power system of four-wheel drive vehicle and working method
Technical Field
The invention belongs to the technical field of hybrid electric vehicles, and particularly relates to a hybrid power system of a four-wheel drive vehicle and a working method.
Background
The hybrid electric vehicle is an automobile provided with more than two power sources, and the current hybrid electric vehicle generally refers to an automobile with the power sources of an internal combustion engine and a motor.
At present, the structure of a hybrid system of a hybrid vehicle is developed mainly based on a conventional automatic transmission. Specifically, a motor may be integrated at the front end or the rear end of a transmission such as an automatic transmission, a sequential transmission, a continuously variable transmission or a dual clutch transmission of an automobile, thereby constituting a hybrid system of a hybrid automobile. However, the difficulty of the design and manufacture technology of the automatic gearbox is high, many independent brand vehicles and enterprises in China are not completely mastered, and the development of hybrid vehicles based on the automatic gearbox technology is limited. Therefore, the development of the hybrid power system independent of the automatic transmission manufacturing technology is beneficial to the development and progress of the hybrid power technology of domestic enterprises.
Disclosure of Invention
In view of the above, the invention aims to provide a hybrid power system of a four-wheel drive vehicle, which has a simple structure, does not need to add a motor on the basis of a traditional automatic gearbox, and is easy to design, produce and manufacture a coupling box; the working modes are multiple, the series mode at low speed can be realized, and the parallel mode at medium and high speed can also be realized; the dynamic property is strong, and pure electric can be in a single-motor driving mode or a double-motor four-drive mode; the energy-saving engine has the advantages that the energy is saved, the parallel mode of combining the engine and any one of the motors can be adopted at medium and high speeds, the direct drive mode of the engine is fully utilized, and the energy is saved. .
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a hybrid power system for a four-wheel drive vehicle is characterized in that: comprises an engine, a first clutch, an engine power input shaft, a driven gear, a driving gear, a first motor, a second clutch, a front main reducing driving gear, a front main reducing driven gear, a front differential mechanism, a second motor, a rear main reducing driving gear, a rear main reducing driven gear and a rear differential mechanism, wherein,
the engine is used for providing power for driving the first motor to generate electricity or power for driving the front wheels to run when in operation, the first clutch can disconnect the power input shaft of the engine from the engine when being disconnected, the engine and the power input shaft of the engine are integrated when in combination, the first motor can be used as a motor to drive a vehicle and start the engine or can be used as a generator to convert the power of the engine into electric energy, the driven gear is connected with the first motor shaft, the driving gear is connected with the power input shaft of the engine and is used for transmitting the power of the first motor to the power input shaft of the engine through speed reduction and torque increase or transmitting the power of the engine to the first motor to generate electricity after speed reduction and torque increase, the second clutch is used for disconnecting the power input shaft of the engine from the front main reduction driving gear when being disconnected and recovering the connection between the power input shaft of the engine and the front main, the power of the engine and the first motor can be transmitted to the front wheel, the front main reduction driving gear and the front main reduction driven gear form a pair of reduction gear pairs, and the reduction gear pairs are used for reducing and twisting the power transmitted to the front main reduction driving gear, and then transmitting the power to the front differential mechanism to drive the front wheel.
The second motor is arranged on the rear drive axle, and the power of the second motor is transmitted to the rear differential mechanism to drive the rear wheel after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase; the second motor can be used as a motor to drive the vehicle and also can be used as a generator to convert the kinetic energy of the rear wheels into electric energy through the rear driving reduction gear and the rear driving reduction driven gear when the vehicle is braked.
Another objective of the present invention is to provide a working method of a hybrid power system of a four-wheel drive vehicle, which can realize a first motor pure electric operation mode, a second motor pure electric operation mode, a dual-motor pure electric four-wheel drive operation mode, a series connection mode, and an engine direct drive mode, wherein the engine and the first motor form a parallel operation mode, the engine and the second motor form a parallel operation mode, the engine and the two motors form a parallel operation mode, and the in-situ parking power generation mode is 9 modes, wherein:
the first motor pure electric operation mode: the engine is closed, the first clutch is separated, the second clutch is combined, the first motor works in an electric state, the power of the first motor is transmitted to the engine power input shaft through the driving gear and the driven gear in a speed reducing and torque increasing mode, is transmitted to the front main reducing driving gear through the second clutch in a speed reducing and torque increasing mode, is transmitted to the front differential in a speed reducing and torque increasing mode through the front main reducing driven gear in a speed reducing and torque increasing mode, drives the front wheel to run, and is in an idle running state.
Further, the second motor pure electric operation mode: the engine is closed, the first clutch is separated, the second clutch is separated, the first motor is in a static state, the second motor works in an electric state, power is transmitted to the rear differential mechanism after being reduced and torque-increased by the rear main reduction driving gear and the rear main reduction driven gear, and the rear differential mechanism drives the rear wheel to run.
Further, the dual-motor pure electric four-wheel drive operation mode is as follows: the engine is closed, the first clutch is separated, the second clutch is combined, the first motor works in an electric state, the second motor works in an electric state, the power of the first motor is transmitted to the power input shaft of the engine through the driving gear and the driven gear for speed reduction and torque increase, transmitted to the front main reduction driving gear through the second clutch, then transmitted to the front differential for speed reduction and torque increase through the front main reduction driven gear, and then transmitted to the front differential to drive the front wheels to run; meanwhile, the power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase, and the rear wheel is driven to run.
Further, series mode: the engine works, the first clutch is combined, the second clutch is separated, the first motor works in a power generation state, the power of the engine is transmitted to the first motor for power generation after being accelerated by the first clutch, the power input shaft of the engine, the driven gear and the driving gear, the generated power is preferentially used by the second motor, and redundant electric energy is stored in a vehicle power battery. Meanwhile, the second motor works in an electric state, and power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear to reduce speed and increase torque, so that the rear wheel is driven to run.
Further, the engine direct drive mode: the engine works, the first clutch is combined, the second clutch is combined, the first motor and the second motor are in an idle running state, the power of the engine is transmitted to the front main reduction driving gear through the first clutch, the power input shaft of the engine and the second clutch, then is decelerated and torque-increased through the front main reduction driven gear, and then is transmitted to the front differential mechanism to drive the front wheel to run. Since the engine must operate above idle speed, this mode must be applied above a certain predetermined vehicle speed above idle speed.
Further, the engine and the first motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine works, the first clutch is combined, the second clutch is combined, the first motor works in an electric state, and the second motor is in an idle state; the engine power is transmitted to the engine power input shaft through the first clutch, the first motor power is transmitted to the engine power input shaft through the driving gear and the driven gear in a speed reduction and torque increase mode, the two power torques are coupled and then transmitted to the front main reduction driving gear through the second clutch, and then transmitted to the front differential mechanism in a speed reduction and torque increase mode through the front main reduction driven gear to drive the front wheel to run.
Further, the engine and the second motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine works, the first clutch is combined, the second clutch is combined, the first motor works in an idle state, and the second motor is in an electric state; the power of the engine is transmitted to a front main reduction driving gear through a first clutch, an engine power input shaft and a second clutch, is decelerated and torque-increased through a front main reduction driven gear, and is transmitted to a front differential mechanism to drive a front wheel to run; the power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase, and the rear wheel is driven to run.
Further, the engine and the two electric machines form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine works, the first clutch is combined, the second clutch is combined, the first motor works in an electric state, and the second motor is in an electric state; the engine power is transmitted to an engine power input shaft through a first clutch, the first motor power is transmitted to the engine power input shaft through a driving gear and a driven gear in a speed reduction and torque increase mode, the two power torques are coupled and then transmitted to a front main reduction driving gear through a second clutch, then transmitted to a front differential mechanism in a speed reduction and torque increase mode through a front main reduction driven gear, and then transmitted to a front differential mechanism to drive a front wheel to run; the power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase, and the rear wheel is driven to run.
Further, the in-place parking power generation mode: when the vehicle is parked, the wheels are forcibly braked, the engine works, the first clutch is combined, the second clutch is separated, the first motor works in a power generation state, the power of the engine is transmitted to the first motor for power generation after being accelerated by the first clutch, the power input shaft of the engine, the driven gear and the driving gear, and the generated power can be stored in a power battery of the vehicle or supplied to the outside for use.
Compared with the prior art, the hybrid power system of the four-wheel drive vehicle and the working method have the following advantages:
(1) the invention has simple structure, the front drive axle is provided with one motor, the rear drive axle is provided with one motor, the structure is easy to design and manufacture without depending on the traditional automatic gearbox technology; two clutches are arranged in the front power coupling box, so that 3 pure electric driving modes can be realized, and 9 modes including 3 parallel driving modes, engine direct driving, series connection and parking power generation modes are realized, and the system redundancy is increased;
(2) the system is internally provided with a gear shifting mechanism, gears are in a normally engaged state, mode conversion can be realized only by combining or separating the clutch, and the state conversion is stable and smooth without pause;
(3) the invention can realize pure electric drive of double motors, and the parallel drive mode of the engine and the double motors has large peak power and strong dynamic property;
(4) the direct drive of the engine or the parallel configuration of the engine and the motor can be realized at medium and high speed, the energy conversion loss is reduced, and more energy is saved;
(5) the invention can realize the flexible conversion between the four-wheel drive mode and the two-wheel drive mode and is suitable for different terrains and working condition requirements.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a hybrid power system of a four-wheel drive vehicle according to an embodiment of the invention;
fig. 2 is another schematic structural diagram according to an embodiment of the present invention.
Description of reference numerals:
1-an engine; 2-a first clutch; 3-engine power input shaft; 4-a driven gear; 5-a drive gear; 6-a first motor; 7-a second clutch; 8-front main reduction driving gear; 9-front driving reduction driven gear; 10-a front differential; 11-a second motor; 12-a rear main reduction drive gear; 13-rear driving reduction driven gear; 14-rear differential.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be further described with reference to the following example and embodiment in conjunction with the accompanying figure 1:
a four-wheel drive vehicle hybrid power system comprises an engine 1, a first clutch 2, an engine power input shaft 3, a driven gear 4, a driving gear 5, a first motor 6, a second clutch 7, a front main reduction driving gear 8, a front main reduction driven gear 9, a front differential mechanism 10, a second motor 11, a rear main reduction driving gear 12, a rear main reduction driven gear 13 and a rear differential mechanism 14.
The engine 1 has the functions of providing power for driving the first motor 6 to generate electricity or providing power for driving front wheels to run when in operation, the first clutch 2 can disconnect the power input shaft 3 of the engine from the engine 1 when being disconnected, the engine 1 and the power input shaft 3 of the engine are integrated when being combined, the first motor 6 can be used as a motor to drive a vehicle, or start the engine 1, or can be used as a generator to convert the power of the engine 1 into electric energy, the driven gear 4 is connected with the shaft of the first motor 6, the driving gear 5 is connected with the power input shaft 3 of the engine, the functions of transmitting the power of the first motor 6 to the power input shaft 3 of the engine through speed reduction and torque increase, or transmitting the power of the engine 1 to the first motor 6 through speed increase and torque decrease to generate electricity, the second clutch 7 has the functions of disconnecting the power input shaft 3 of the engine from the front main reduction driving gear 8 when being disconnected, when the combination is carried out, the power input shaft 3 of the engine is recovered to be connected with the front main reduction driving gear 8, the power of the engine 1 and the first motor 6 can be transmitted to the front wheel, the front main reduction driving gear 8 and the front main reduction driven gear 9 form a pair of reduction gear pairs, and the function is to transmit the power transmitted to the front main reduction driving gear 8 to the front differential mechanism 10 through reduction and torque increase, so as to drive the front wheel.
The second motor 11 is arranged on the rear drive axle, and the power of the second motor is transmitted to the rear differential 14 to drive the rear wheel after passing through the rear main reduction driving gear 12 and the rear main reduction driven gear 13 for speed reduction and torque increase; the second electric machine 11 may be used as a motor to drive the vehicle, or may be used as a generator to convert kinetic energy of the rear wheels into electric energy through the rear driving reduction gear 12 and the rear driving reduction gear 13 when the vehicle is braked.
A four-wheel drive vehicle hybrid power system can realize a first motor pure electric operation mode, a second motor pure electric operation mode, a double-motor pure electric four-wheel drive operation mode, a series connection mode and an engine direct drive mode, wherein the engine and the first motor form a parallel connection operation mode, the engine and the second motor form a parallel connection operation mode, the engine and the two motors form a parallel connection operation mode, and an in-situ parking power generation mode is 9 modes.
The first motor pure electric operation mode: the engine 1 is closed, the first clutch 2 is separated, the second clutch 7 is combined, the first motor 6 works in an electric state, the power of the first motor 6 is transmitted to the engine power input shaft 3 through the driving gear 5 and the driven gear 4 in a speed reducing and torque increasing mode, is transmitted to the front main reduction driving gear 8 through the second clutch 7 in a speed reducing and torque increasing mode, is transmitted to the front differential mechanism 10 in a speed reducing and torque increasing mode through the front main reduction driven gear 9 in a speed reducing and torque increasing mode, drives a front wheel to run, and the second motor 11 is in an idle running state.
The second motor pure electric operation mode: the engine 1 is closed, the first clutch 2 is separated, the second clutch 7 is separated, the first motor 6 is in a static state, the second motor 11 works in an electric state, power is transmitted to the rear differential 14 after being decelerated and torque-increased by the rear main reduction driving gear 12 and the rear main reduction driven gear 13, and a rear wheel is driven to run.
The dual-motor pure electric four-wheel drive operation mode comprises the following steps: the engine 1 is closed, the first clutch 2 is separated, the second clutch 7 is combined, the first motor 6 works in an electric state, the second motor 11 works in an electric state, the power of the first motor 6 is transmitted to the engine power input shaft 3 through the driving gear 5 and the driven gear 4 for speed reduction and torque increase, is transmitted to the front main reduction driving gear 8 through the second clutch 7, is transmitted to the front differential mechanism 10 for speed reduction and torque increase through the front main reduction driven gear 9, and then is transmitted to the front differential mechanism 10 to drive the front wheels to run; meanwhile, the power of the second motor 11 is transmitted to the rear differential 14 after being decelerated and torque-increased by the rear main reduction driving gear 12 and the rear main reduction driven gear 13, so as to drive the rear wheels to run.
Series mode: the engine 1 works, the first clutch 2 is combined, the second clutch 7 is separated, the first motor 6 works in a power generation state, the engine power is transmitted to the first motor 6 for power generation after being accelerated by the first clutch 2, the engine power input shaft 3, the driven gear 4 and the driving gear 5, the generated power is preferentially used by the second motor 11, and redundant electric energy is stored in a vehicle power battery. Meanwhile, the second motor 11 works in an electric state, and the power of the second motor 11 is transmitted to the rear differential 14 after being decelerated and torque-increased by the rear main reduction driving gear 12 and the rear main reduction driven gear 13, so as to drive the rear wheel to run.
Direct drive mode of the engine: the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 and the second motor 11 are in an idle running state, the power of the engine 1 is transmitted to the front main reduction driving gear 8 through the first clutch 2, the engine power input shaft 3 and the second clutch 7, is reduced and torque-increased through the front main reduction driven gear 9, and is transmitted to the front differential mechanism 10 to drive a front wheel to run. Since the engine 1 must operate above idle speed, this mode must be applied above a certain predetermined vehicle speed at which the actual vehicle speed is above idle.
The engine and the first motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 works in an electric state, and the second motor 11 is in an idle state; the power of an engine 1 is transmitted to an engine power input shaft 3 through a first clutch 2, the power of a first motor 6 is transmitted to the engine power input shaft 3 through a driving gear 5 and a driven gear 4 in a speed reduction and torque increase mode, the two power torques are coupled and then transmitted to a front main reduction driving gear 8 through a second clutch 7, and then transmitted to a front differential mechanism 10 in a speed reduction and torque increase mode through a front main reduction driven gear 9 to drive a front wheel to run.
The engine and the second motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 works in an idle state, and the second motor 11 is in an electric state; the power of an engine 1 is transmitted to a front main reduction driving gear 8 through a first clutch 2, an engine power input shaft 3 and a second clutch 7, is reduced and torque-increased through a front main reduction driven gear 9, and is transmitted to a front differential 10 to drive a front wheel to run; the power of the second motor 11 is transmitted to a rear differential 14 after being decelerated and torque-increased by a rear main reduction driving gear 12 and a rear main reduction driven gear 13, and then the rear wheel is driven to run.
The engine and the two motors form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 works in an electric state, and the second motor 11 is in an electric state; the power of an engine 1 is transmitted to an engine power input shaft 3 through a first clutch 2, the power of a first motor 6 is transmitted to the engine power input shaft 3 through a driving gear 5 and a driven gear 4 for speed reduction and torque increase, the two power torques are coupled, then transmitted to a front main reduction driving gear 8 through a second clutch 7, then transmitted to a front main reduction driven gear 9 for speed reduction and torque increase, and then transmitted to a front differential 10 to drive a front wheel to run; the power of the second motor 11 is transmitted to a rear differential 14 after being decelerated and torque-increased by a rear main reduction driving gear 12 and a rear main reduction driven gear 13, and then the rear wheel is driven to run.
In-situ parking power generation mode: when the vehicle is parked, wheels are forcibly braked, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is separated, the first motor 6 works in a power generation state, the power of the engine 1 is increased in speed through the first clutch 2, the engine power input shaft 3, the driven gear 4 and the driving gear 5 and then is transmitted to the first motor 6 to generate power, and the generated power can be stored in a vehicle power battery or externally supplied with power for use.
The 9 modes are automatically converted under the real road surface circulation working condition at any time according to the change of the vehicle speed, the load, the SOC of the power battery and the power demand of a driver by the adjustment of a control strategy of the whole vehicle controller, and the aim of saving energy is fulfilled by taking the lowest energy consumption as a principle. When the vehicle brakes, the enabled motor is controlled by the controller and is converted into a generator to generate electricity at any time for energy recovery. When needing to reverse, because the speed of a motor is generally very low, the power demand is not big, generally adopts 11 pure electric modes of reversal of second motor to realize backing a car, perhaps adopts two pure electric modes of motor reversal to realize backing a car.
The general principle of the control strategy is that when the power battery is in a high SOC, a single-motor pure electric driving mode is used, and which motor is used depends on the power requirement size and the high-efficiency zone of which motor is most matched; when a driver demands high power, the mode is switched to a dual-motor pure electric driving mode; when the vehicle is started or runs at a low speed, a pure electric mode is generally used; (ii) a When the SOC of the power battery is at a low level and the vehicle speed is also at a low speed for a long time, a series mode is adopted, the SOC of the power battery is at a medium-low level, and when the vehicle speed is also at a medium-high speed, the hybrid power mode with engines connected in parallel is generally used for saving energy; when the motor runs at a high speed, a single-motor or double-motor parallel mode is adopted according to the required power; and when the SOC of the battery is extremely low or external power supply requirements exist, a parking power generation mode is adopted.
The motor used in the embodiment is a high-speed motor, and is low in cost and flexible in arrangement.
The invention will be further described with reference to the following example and embodiment in conjunction with fig. 2:
a four-wheel drive vehicle hybrid power system comprises an engine 1, a first clutch 2, an engine power input shaft 3, a first motor 6, a second clutch 7, a front main reduction driving gear 8, a front main reduction driven gear 9, a front differential 10, a second motor 11, a rear main reduction driving gear 12, a rear main reduction driven gear 13 and a rear differential 14.
The engine 1 has the functions of providing power for driving the first motor 6 to generate electricity or providing power for driving front wheels to run when in operation, the engine power input shaft 3 is connected with the first motor 6, the connection between the engine power input shaft 3 and the engine 1 can be disconnected when the first clutch 2 is separated, when in combination, the engine 1 and the engine power input shaft 3 are integrated, and the first motor 6 can be used as a motor to drive a vehicle, or start the engine 1, or can be used as a generator to convert the power of the engine 1 into electric energy; the second clutch 7 is connected with the other end of the rotor shaft of the first motor 6, the second clutch 7 has the function of cutting off the connection between the first motor 6 and the front main reduction driving gear 8 when in separation, and the connection between the first motor 6 and the front main reduction driving gear 8 is recovered when in combination, so that the power of the engine 1 and the first motor 6 can be transmitted to the front wheel, the front main reduction driving gear 8 and the front main reduction driven gear 9 form a pair of reduction gear pairs, and the function of transmitting the power transmitted to the front main reduction driving gear 8 to the front differential 10 through reduction and torque increase and then to drive the front wheel.
The second motor 11 is arranged on the rear drive axle, and the power of the second motor is transmitted to the rear differential 14 to drive the rear wheel after passing through the rear main reduction driving gear 12 and the rear main reduction driven gear 13 for speed reduction and torque increase; the second electric machine 11 may be used as a motor to drive the vehicle, or may be used as a generator to convert kinetic energy of the rear wheels into electric energy through the rear driving reduction gear 12 and the rear driving reduction gear 13 when the vehicle is braked.
A four-wheel drive vehicle hybrid power system can realize a first motor 6 single-motor pure electric operation mode, a second motor 11 single-motor pure electric operation mode, a double-motor pure electric four-wheel drive operation mode, a series connection mode and an engine direct drive mode, wherein the engine and the first motor 6 form a parallel operation mode, the engine and the second motor 11 form a parallel operation mode, the engine and the two motors form a parallel operation mode, and an in-situ parking power generation mode is 9 modes.
The first motor pure electric operation mode: the engine 1 is closed, the first clutch 2 is separated, the second clutch 7 is combined, the first motor 6 works in an electric state, the power of the first motor 6 is transmitted to the front main reduction driving gear 8 through the second clutch 7, is reduced and torque-increased through the front main reduction driven gear 9, is transmitted to the front differential 10 to drive a front wheel to run, and the second motor 11 is in an idle state.
The second motor pure electric operation mode: the engine 1 is closed, the first clutch 2 is separated, the second clutch 7 is separated, the first motor 6 is in a static state, the second motor 11 works in an electric state, power is transmitted to the rear differential 14 after being decelerated and torque-increased by the rear main reduction driving gear 12 and the rear main reduction driven gear 13, and a rear wheel is driven to run.
The dual-motor pure electric four-wheel drive operation mode comprises the following steps: the engine 1 is closed, the first clutch 2 is separated, the second clutch 7 is combined, the first motor 6 works in an electric state, the second motor 11 works in an electric state, the power of the first motor 6 is transmitted to the front main reduction driving gear 8 through the second clutch 7, then is reduced and torque-increased through the front main reduction driven gear 9, and then is transmitted to the front differential 10 to drive the front wheels to run; meanwhile, the power of the second motor 11 is transmitted to the rear differential 14 after being decelerated and torque-increased by the rear main reduction driving gear 12 and the rear main reduction driven gear 13, so as to drive the rear wheels to run.
Series mode: the engine 1 works, the first clutch 2 is combined, the second clutch 7 is separated, the first motor 6 works in a power generation state, the engine power is transmitted to the first motor 6 through the first clutch 2 and the engine power input shaft 3 to generate power, the generated power is preferentially used by the second motor 11, and redundant electric energy is stored in a vehicle power battery. Meanwhile, the second motor 11 works in an electric state, and the power of the second motor 11 is transmitted to the rear differential 14 after being decelerated and torque-increased by the rear main reduction driving gear 12 and the rear main reduction driven gear 13, so as to drive the rear wheel to run.
Direct drive mode of the engine: the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 and the second motor 11 are in an idle running state, the power of the engine 1 is transmitted to the front main reduction driving gear 8 through the first clutch 2, the engine power input shaft 3 and the second clutch 7, is reduced and torque-increased through the front main reduction driven gear 9, and is transmitted to the front differential mechanism 10 to drive a front wheel to run. Since the engine 1 must operate above idle speed, this mode must be applied above a certain predetermined vehicle speed at which the actual vehicle speed is above idle.
The engine and the first motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 works in an electric state, and the second motor 11 is in an idle state; the power of the engine 1 is transmitted to the engine power input shaft 3 through the first clutch 2, is coupled with the torque of the first motor 6, is transmitted to the front main reduction driving gear 8 through the second clutch 7, is subjected to speed reduction and torque increase through the front main reduction driven gear 9, and is transmitted to the front differential 10 to drive the front wheel to run.
The engine and the second motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 works in an idle state, and the second motor 11 is in an electric state; the power of an engine 1 is transmitted to a front main reduction driving gear 8 through a first clutch 2, an engine power input shaft 3 and a second clutch 7, is reduced and torque-increased through a front main reduction driven gear 9, and is transmitted to a front differential 10 to drive a front wheel to run; the power of the second motor 11 is transmitted to a rear differential 14 after being decelerated and torque-increased by a rear main reduction driving gear 12 and a rear main reduction driven gear 13, and then the rear wheel is driven to run.
The engine and the two motors form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is combined, the first motor 6 works in an electric state, and the second motor 11 is in an electric state; the power of the engine 1 is transmitted to an engine power input shaft 3 through a first clutch 2, is coupled with the torque of a first motor 6, then is transmitted to a front main reduction driving gear 8 through a second clutch 7, is subjected to speed reduction and torque increase through a front main reduction driven gear 9, and then is transmitted to a front differential 10 to drive a front wheel to run; the power of the second motor 11 is transmitted to a rear differential 14 after being decelerated and torque-increased by a rear main reduction driving gear 12 and a rear main reduction driven gear 13, and then the rear wheel is driven to run.
In-situ parking power generation mode: when the vehicle is parked, wheels are forcibly braked, the engine 1 works, the first clutch 2 is combined, the second clutch 7 is separated, the first motor 6 works in a power generation state, the power of the engine 1 is transmitted to the first motor 6 through the first clutch 2 and the engine power input shaft 3 to generate power, and the generated power can be stored in a vehicle power battery or supplied to the outside for use.
The 9 modes are automatically converted under the real road surface circulation working condition at any time according to the change of the vehicle speed, the load, the SOC of the power battery and the power demand of a driver by the adjustment of a control strategy of the whole vehicle controller, and the aim of saving energy is fulfilled by taking the lowest energy consumption as a principle. When the vehicle brakes, the enabled motor is controlled by the controller and is converted into a generator to generate electricity at any time for energy recovery. When needing to reverse, because the speed of a motor is generally very low, the power demand is not big, generally adopts 11 pure electric modes of reversal of second motor to realize backing a car, perhaps adopts two pure electric modes of motor reversal to realize backing a car.
The general principle of the control strategy is that when the power battery is in a high SOC, a single-motor pure electric driving mode is used, and which motor is used depends on the power requirement size and the high-efficiency zone of which motor is most matched; when a driver demands high power, the mode is switched to a dual-motor pure electric driving mode; when the vehicle is started or runs at a low speed, a pure electric mode is generally used; (ii) a When the SOC of the power battery is at a low level and the vehicle speed is also at a low speed for a long time, a series mode is adopted, the SOC of the power battery is at a medium-low level, and when the vehicle speed is also at a medium-high speed, the hybrid power mode with engines connected in parallel is generally used for saving energy; when the motor runs at a high speed, a single-motor or double-motor parallel mode is adopted according to the required power; and when the SOC of the battery is extremely low or external power supply requirements exist, a parking power generation mode is adopted.
The motor used in the embodiment has small vibration and high efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A four-wheel-drive vehicle hybrid powertrain characterized by: comprises an engine, a first clutch, an engine power input shaft, a driven gear, a driving gear, a first motor, a second clutch, a front main reducing driving gear, a front main reducing driven gear, a front differential mechanism, a second motor, a rear main reducing driving gear, a rear main reducing driven gear and a rear differential mechanism, wherein,
the engine is used for providing power for driving the first motor to generate electricity or power for driving the front wheels to run when in operation, the first clutch can disconnect the power input shaft of the engine from the engine when being disconnected, the engine and the power input shaft of the engine are integrated when in combination, the first motor can be used as a motor to drive a vehicle and start the engine or can be used as a generator to convert the power of the engine into electric energy, the driven gear is connected with the first motor shaft, the driving gear is connected with the power input shaft of the engine and is used for transmitting the power of the first motor to the power input shaft of the engine through speed reduction and torque increase or transmitting the power of the engine to the first motor to generate electricity after speed reduction and torque increase, the second clutch is used for disconnecting the power input shaft of the engine from the front main reduction driving gear when being disconnected and recovering the connection between the power input shaft of the engine and the front main, the power of the engine and the first motor can be transmitted to the front wheel, the front main reduction driving gear and the front main reduction driven gear form a pair of reduction gear pairs, and the reduction gear pairs are used for reducing and twisting the power transmitted to the front main reduction driving gear, and then transmitting the power to the front differential mechanism to drive the front wheel.
The second motor is arranged on the rear drive axle, and the power of the second motor is transmitted to the rear differential mechanism to drive the rear wheel after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase; the second motor can be used as a motor to drive the vehicle and also can be used as a generator to convert the kinetic energy of the rear wheels into electric energy through the rear driving reduction gear and the rear driving reduction driven gear when the vehicle is braked.
2. The working method of the hybrid power system of the four-wheel drive vehicle is characterized by comprising the following steps: can realize first motor electricelectric motor operational mode, second motor electricelectric motor operational mode, two motor electricelectric four-wheel drive operational mode, the tandem mode, the engine directly drives the mode, and the parallel operation mode is constituteed with first motor to the engine, and the engine constitutes parallel operation mode with the second motor, and the engine constitutes parallel operation mode with two motors, 9 kinds of modes of original place parking electricity generation mode, wherein:
the first motor pure electric operation mode: the engine is closed, the first clutch is separated, the second clutch is combined, the first motor works in an electric state, the power of the first motor is transmitted to the engine power input shaft through the driving gear and the driven gear in a speed reducing and torque increasing mode, is transmitted to the front main reducing driving gear through the second clutch in a speed reducing and torque increasing mode, is transmitted to the front differential in a speed reducing and torque increasing mode through the front main reducing driven gear in a speed reducing and torque increasing mode, drives the front wheel to run, and is in an idle running state.
3. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: the second motor pure electric operation mode: the engine is closed, the first clutch is separated, the second clutch is separated, the first motor is in a static state, the second motor works in an electric state, power is transmitted to the rear differential mechanism after being reduced and torque-increased by the rear main reduction driving gear and the rear main reduction driven gear, and the rear differential mechanism drives the rear wheel to run.
4. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: the dual-motor pure electric four-wheel drive operation mode comprises the following steps: the engine is closed, the first clutch is separated, the second clutch is combined, the first motor works in an electric state, the second motor works in an electric state, the power of the first motor is transmitted to the power input shaft of the engine through the driving gear and the driven gear for speed reduction and torque increase, transmitted to the front main reduction driving gear through the second clutch, then transmitted to the front differential for speed reduction and torque increase through the front main reduction driven gear, and then transmitted to the front differential to drive the front wheels to run; meanwhile, the power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase, and the rear wheel is driven to run.
5. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: series mode: the engine works, the first clutch is combined, the second clutch is separated, the first motor works in a power generation state, the power of the engine is transmitted to the first motor for power generation after being accelerated by the first clutch, the power input shaft of the engine, the driven gear and the driving gear, the generated power is preferentially used by the second motor, and redundant electric energy is stored in a vehicle power battery. Meanwhile, the second motor works in an electric state, and power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear to reduce speed and increase torque, so that the rear wheel is driven to run.
6. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: direct drive mode of the engine: the engine works, the first clutch is combined, the second clutch is combined, the first motor and the second motor are in an idle running state, the power of the engine is transmitted to the front main reduction driving gear through the first clutch, the power input shaft of the engine and the second clutch, then is decelerated and torque-increased through the front main reduction driven gear, and then is transmitted to the front differential mechanism to drive the front wheel to run. Since the engine must operate above idle speed, this mode must be applied above a certain predetermined vehicle speed above idle speed.
7. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: the engine and the first motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine works, the first clutch is combined, the second clutch is combined, the first motor works in an electric state, and the second motor is in an idle state; the engine power is transmitted to the engine power input shaft through the first clutch, the first motor power is transmitted to the engine power input shaft through the driving gear and the driven gear in a speed reduction and torque increase mode, the two power torques are coupled and then transmitted to the front main reduction driving gear through the second clutch, and then transmitted to the front differential mechanism in a speed reduction and torque increase mode through the front main reduction driven gear to drive the front wheel to run.
8. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: the engine and the second motor form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine works, the first clutch is combined, the second clutch is combined, the first motor works in an idle state, and the second motor is in an electric state; the power of the engine is transmitted to a front main reduction driving gear through a first clutch, an engine power input shaft and a second clutch, is decelerated and torque-increased through a front main reduction driven gear, and is transmitted to a front differential mechanism to drive a front wheel to run; the power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase, and the rear wheel is driven to run.
9. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: the engine and the two motors form a parallel operation mode: when the vehicle speed exceeds a certain preset value, the engine works, the first clutch is combined, the second clutch is combined, the first motor works in an electric state, and the second motor is in an electric state; the engine power is transmitted to an engine power input shaft through a first clutch, the first motor power is transmitted to the engine power input shaft through a driving gear and a driven gear in a speed reduction and torque increase mode, the two power torques are coupled and then transmitted to a front main reduction driving gear through a second clutch, then transmitted to a front differential mechanism in a speed reduction and torque increase mode through a front main reduction driven gear, and then transmitted to a front differential mechanism to drive a front wheel to run; the power of the second motor is transmitted to the rear differential mechanism after passing through the rear main reduction driving gear and the rear main reduction driven gear for speed reduction and torque increase, and the rear wheel is driven to run.
10. The operating method of a hybrid system for a four-wheel drive vehicle according to claim 2, characterized in that: in-situ parking power generation mode: when the vehicle is parked, the wheels are forcibly braked, the engine works, the first clutch is combined, the second clutch is separated, the first motor works in a power generation state, the power of the engine is transmitted to the first motor for power generation after being accelerated by the first clutch, the power input shaft of the engine, the driven gear and the driving gear, and the generated power can be stored in a power battery of the vehicle or supplied to the outside for use.
CN201910984219.2A 2019-10-16 2019-10-16 Hybrid power system of four-wheel drive vehicle and working method Pending CN110667368A (en)

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