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CN111152643A - Control method for timely four-wheel drive system of hybrid electric vehicle - Google Patents

Control method for timely four-wheel drive system of hybrid electric vehicle Download PDF

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Publication number
CN111152643A
CN111152643A CN202010004687.1A CN202010004687A CN111152643A CN 111152643 A CN111152643 A CN 111152643A CN 202010004687 A CN202010004687 A CN 202010004687A CN 111152643 A CN111152643 A CN 111152643A
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China
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entering
whole vehicle
soc
mode
vehicle
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Chinese (zh)
Inventor
曾小华
吴梓乔
宋大凤
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Jilin University
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Jilin University
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Priority to CN202010004687.1A priority Critical patent/CN111152643A/en
Publication of CN111152643A publication Critical patent/CN111152643A/en
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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
    • 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
    • B60K25/06—Auxiliary drives from the transmission power take-off
    • 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
    • B60K6/22—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 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 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
    • 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
    • B60K6/22—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 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 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
    • 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
    • B60K6/22—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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/28—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 apparatus, components or means specially adapted for HEVs characterised by the electric energy storing means, e.g. batteries or capacitors
    • 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
    • B60K6/22—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 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 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
    • 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
    • B60K6/54—Transmission for changing ratio
    • B60K6/543—Transmission for changing ratio the transmission being a continuously variable transmission
    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0015—Disposition of motor in, or adjacent to, traction wheel the motor being hydraulic
    • 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
    • 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
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/84—Data processing systems or methods, management, administration

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Fluid Gearings (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

The invention discloses a control method for a timely four-wheel drive system of a hybrid electric vehicle. The method can reasonably switch the modes of the whole automobile in different working environments, and simultaneously improves the economy and the dynamic property of the timely four-wheel drive system of the hybrid electric vehicle, thereby fully exerting the advantages of the system; the method has the advantages of simple control flow, clear switching rule and easy engineering realization.

Description

Control method for timely four-wheel drive system of hybrid electric vehicle
Technical Field
The invention relates to the technical field of hybrid electric vehicle control, in particular to a control method of a timely four-wheel drive system of a hybrid electric vehicle.
Background
Compared with the traditional automobile, the hybrid electric automobile has more selectable working modes, the whole automobile can obtain good economical efficiency and emission characteristics by reasonably switching the working modes under different working conditions, the requirement of the automobile on fossil energy is greatly reduced, and the hybrid electric automobile becomes one of effective ways for energy conservation and emission reduction. Meanwhile, the requirements of people on the dynamic property, the trafficability property and the versatility of the automobile are increased day by day, and a driving system represented by four-wheel drive can be well adapted to most road conditions and has excellent driving experience. The hybrid power timely four-wheel drive system can simultaneously meet the requirements of economy and power performance, and because the system has more working modes, how to reasonably switch and control each working mode is the key for improving the power performance and the economy of the whole vehicle.
Disclosure of Invention
The invention provides a control method for a hybrid electric vehicle timely four-wheel drive system, which gives full play to the energy-saving and dynamic advantages of the hybrid electric vehicle timely four-wheel drive system.
In order to achieve the purpose, the technical scheme for realizing the control method for the timely four-wheel drive system of the hybrid electric vehicle provided by the invention is as follows:
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: the output shaft of the engine 4 is connected with a clutch 11, and the clutch 11 is connected with an input shaft A of a torque coupler 9; the power battery 6 is in circuit connection with the inverter 5, the inverter 5 is in circuit connection with the permanent magnet synchronous motor 7, and the permanent magnet synchronous motor 7 is in mechanical connection with an input shaft B of the torque coupler 10; an output shaft of the torque coupler 10 is mechanically connected with a double-clutch automatic transmission 9, and the double-clutch automatic transmission 9 is mechanically connected with a differential 8.
The hydraulic hub system comprises a hydraulic variable pump 14, a power takeoff 12, a power takeoff output shaft 13, an energy accumulator 3, a hydraulic control valve bank 2, a left front wheel hub hydraulic motor 15 and a right front wheel hub hydraulic motor 1; the hydraulic hub system is characterized in that: the power takeoff 12 is connected with a hydraulic variable pump 14 through a power takeoff output shaft 13; the hydraulic variable pump 14 is connected with the hydraulic control valve group 2, the outer port L1 of the hydraulic control valve group 2 is connected with the input ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, the outer port L2 of the hydraulic control valve group 2 is connected with the output ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, and the outer port L3 of the hydraulic control valve group 2 is connected with the energy accumulator 3.
The control method of the timely four-wheel drive system of the hybrid electric vehicle specifically comprises the following steps:
the method comprises the following steps: the driver judges whether the mechanical transmission system is damaged or not according to the driving feedback of the whole vehicle; if the mechanical system is damaged, the whole vehicle is switched to a crawling mode; if the mechanical system is not damaged, entering a second step;
step two: judging whether the opening degree of a brake pedal is larger than 0; if the opening degree of the brake pedal is larger than 0, the whole vehicle is in a brake mode, and entering a third step; otherwise, the whole vehicle is in a driving mode, and then the step four is carried out;
step three: entering a step three, representing that the whole vehicle is in a braking mode, and further judging the SOC states of the power battery (6) and the energy accumulator (3); if the SOC of the power battery (6)batteryLess than a set maximum threshold SOChighOr SOC of the accumulator (3)haIf the brake recovery rate is less than 1, entering a brake recovery mode; otherwise, entering a mechanical braking mode;
step four: entering a step four, representing that the whole vehicle is in a driving mode, and further judging whether the whole vehicle is in an initial starting stage; if the whole vehicle is in the initial starting stage, entering the step five; otherwise, entering the step six;
step five: entering a step five, representing that the whole vehicle is in an initial starting stage, and further judging the SOC state of the power battery (6); if the SOC of the power battery (6)batteryGreater than a set minimum threshold SOClowEntering a pure electric mode; otherwise, entering an engine direct drive mode;
step six: entering a sixth step, namely the whole vehicle is not in an initial starting stage, and further judging whether the vehicle speed v of the whole vehicle is greater than the maximum vehicle speed v of the hydraulic component1(ii) a If v is greater than v1If so, stopping the work of the hydraulic component and entering a seventh step; otherwise, the hydraulic system can continue to work, and the step eight is entered;
step seven: entering a step seven, representing that the hydraulic system of the whole vehicle stops working, and further judging whether the speed v of the whole vehicle is greater than the maximum speed v of the economical driving2(ii) a If v is less than v2Entering an economic driving mode; otherwise, entering an engine direct drive mode;
step eight: step eight is entered, the hydraulic system can still continue to work at the current vehicle speed of the whole vehicle, and the rear wheel slip ratio S is further judgedrearWhether or not it is greater than a given threshold S1And whether the accelerator Pedal opening degree Pedal is greater than a given threshold value Pedalthre(ii) a If SrearGreater than a given threshold S1Or Pedal is greater than a given threshold PedalthreEntering a four-wheel drive mode; otherwise, the economical driving mode is entered.
In the seventh step and the eighth step, when the whole vehicle is in the economic driving mode:
a: looking up a table to obtain the optimal point power P of the engine at the current rotating speedengAnd estimating the required power P according to the opening degree of the accelerator pedalreqFurther comparing the sizes of the two; if the engine has the optimal point power PengLess than the required power PreqEntering B; otherwise, entering C;
b: further judging the SOC state of the power battery 6; if SOC is in the power battery 6batteryGreater than a set minimum threshold SOClowEntering an engine and motor combined driving mode; otherwise, entering an engine direct drive mode;
c: further judging the SOC states of the power battery 6 and the energy accumulator 3; if the SOC of the power battery 6batteryLess than a set maximum threshold SOChighOr SOC of the accumulator 3haIf the current value is less than 1, entering a driving energy charging mode; otherwise, the engine direct drive mode is entered.
Compared with the prior art, the invention has the beneficial effects that: the control method for the timely four-wheel drive system of the hybrid electric vehicle can simultaneously ensure the economy and the dynamic property of the timely four-wheel drive system of the hybrid electric vehicle, and has concise control flow and easy engineering realization.
Drawings
FIG. 1 is a schematic structural diagram of a four-wheel drive system for a hybrid electric vehicle according to the present invention;
FIG. 2 is a flow chart of a control method for a hybrid electric vehicle four-wheel drive system in due time according to the present invention;
FIG. 3 is a flow chart of an economy mode of travel according to the present invention;
the reference numbers in the figures illustrate: 1. the hydraulic control system comprises a right front wheel hub hydraulic motor, 2. a hydraulic control valve group, 3. an energy accumulator, 4. an engine, 5. an inverter, 6. a power battery, 7. a permanent magnet synchronous motor, 8. a differential, 9. a double-clutch automatic transmission, 10. a torque coupler, 11. a clutch, 12. a power takeoff, 13. a power takeoff output shaft, 14. a hydraulic variable pump and 15. a left front wheel hub hydraulic motor.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 1, the hybrid electric vehicle timely four-wheel drive system includes an oil-electric hybrid system and a hydraulic hub system.
The oil-electricity hybrid power system comprises an engine 4, a clutch 11, a permanent magnet synchronous motor 7, an inverter 5, a power battery 6, a torque coupler 10, a double-clutch automatic transmission 9 and a differential 8; the oil-electricity hybrid power system is characterized in that: the output shaft of the engine 4 is connected with a clutch 11, and the clutch 11 is connected with an input shaft A of a torque coupler 9; the power battery 6 is in circuit connection with the inverter 5, the inverter 5 is in circuit connection with the permanent magnet synchronous motor 7, and the permanent magnet synchronous motor 7 is in mechanical connection with an input shaft B of the torque coupler 10; an output shaft of the torque coupler 10 is mechanically connected with a double-clutch automatic transmission 9, and the double-clutch automatic transmission 9 is mechanically connected with a differential 8.
The hydraulic hub system comprises a hydraulic variable pump 14, a power takeoff 12, a power takeoff output shaft 13, an energy accumulator 3, a hydraulic control valve bank 2, a left front wheel hub hydraulic motor 15 and a right front wheel hub hydraulic motor 1; the hydraulic hub system is characterized in that: the power takeoff 12 is connected with a hydraulic variable pump 14 through a power takeoff output shaft 13; the hydraulic variable pump 14 is connected with the hydraulic control valve group 2, the outer port L1 of the hydraulic control valve group 2 is connected with the input ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, the outer port L2 of the hydraulic control valve group 2 is connected with the output ends of the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1, and the outer port L3 of the hydraulic control valve group 2 is connected with the energy accumulator 3.
When the whole vehicle is in a mechanical braking mode, the braking force of the whole vehicle is provided by the original traditional air braking system;
when the whole vehicle is in a pure electric driving mode, the engine 4 and the hydraulic hub motors 1 and 15 do not work, the power battery 6 transmits energy to the permanent magnet synchronous motor 7 through the inverter 5, and then the energy is transmitted to a rear wheel driving vehicle through the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8;
when the whole vehicle is in an engine direct-drive mode, the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, and the engine 4 transmits energy to a rear wheel drive vehicle through the clutch 11, the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8;
when the whole vehicle is in a four-wheel drive mode, the clutch 11 is combined, and the engine 4 transmits energy to a rear wheel through the clutch 11, the torque coupler 10, the double-clutch automatic transmission 9 and the differential 8; meanwhile, the energy accumulator 3 drives the left front wheel hub hydraulic motor 15 and the right front wheel hub hydraulic motor 1 through the hydraulic control valve group 2 so as to drive the front wheels;
when the whole vehicle is in an engine and motor combined driving mode, the hydraulic hub motors 1 and 15 do not work, the clutch 11 is combined, part of energy is transmitted to the torque coupler 10 from the engine 4 through the clutch 11, and the other part of energy is transmitted to the permanent magnet synchronous motor 7 from the power battery 6 through the inverter 5 and then transmitted to the torque coupler 10; after being coupled in a torque coupler 10, the two parts of energy are transmitted to a rear wheel together through a double-clutch automatic transmission 9 and a differential 8 to drive the vehicle;
when the whole vehicle is in a driving energy charging 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, and then transmits the energy 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 at a certain power, converts part of energy transmitted to the torque coupler 10 by the engine 4 into electric energy, and stores the electric energy in the power battery 6 through the inverter 5; the engine 4 transmits the other part of energy to the 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. 2, the method for controlling a four-wheel drive system in real time for a hybrid electric vehicle specifically includes the following steps:
the method comprises the following steps: the driver judges whether the mechanical transmission system is damaged or not according to the driving feedback of the whole vehicle; if the mechanical system is damaged, the whole vehicle is switched to a crawling mode; if the mechanical system is not damaged, entering a second step;
step two: judging whether the opening degree of a brake pedal is larger than 0; if the opening degree of the brake pedal is larger than 0, the whole vehicle is in a brake mode, and entering a third step; otherwise, the whole vehicle is in a driving mode, and then the step four is carried out;
step three: entering a step three, representing that the whole vehicle is in a braking mode, and further judging the SOC states of the power battery 6 and the energy accumulator 3; if the SOC of the power battery 6batteryLess than a set maximum threshold SOChighOr SOC of the accumulator 3haIf the brake recovery rate is less than 1, entering a brake recovery mode; otherwise, entering a mechanical braking mode;
step four: entering a step four, representing that the whole vehicle is in a driving mode, and further judging whether the whole vehicle is in an initial starting stage; if the whole vehicle is in the initial starting stage, entering the step five; otherwise, entering the step six;
step five: entering a step five, representing that the whole vehicle is in an initial starting stage, and further judging the SOC of the power battery 6A state; if the SOC of the power battery 6batteryGreater than a set minimum threshold SOClowEntering a pure electric mode; otherwise, entering an engine direct drive mode;
step six: entering a sixth step, namely the whole vehicle is not in an initial starting stage, and further judging whether the vehicle speed v of the whole vehicle is greater than the maximum vehicle speed v of the hydraulic component1(ii) a If v is greater than v1If so, stopping the work of the hydraulic component and entering a seventh step; otherwise, the hydraulic system can continue to work, and the step eight is entered;
step seven: entering a step seven, representing that the hydraulic system of the whole vehicle stops working, and further judging whether the speed v of the whole vehicle is greater than the maximum speed v of the economical driving2(ii) a If v is less than v2Entering an economic driving mode; otherwise, entering an engine direct drive mode;
step eight: step eight is entered, the hydraulic system can still continue to work at the current vehicle speed of the whole vehicle, and the rear wheel slip ratio S is further judgedrearWhether or not it is greater than a given threshold S1And whether the accelerator Pedal opening degree Pedal is greater than a given threshold value Pedalthre(ii) a If SrearGreater than a given threshold S1Or Pedal is greater than a given threshold PedalthreEntering a four-wheel drive mode; otherwise, the economical driving mode is entered.
Referring to fig. 3, the eco-run mode specifically includes the following steps:
a: looking up a table to obtain the optimal point power P of the engine at the current rotating speedengAnd estimating the required power P according to the opening degree of the accelerator pedalreqAnd further comparing the sizes of the two. If the engine has the optimal point power PengGreater than the required power PreqEntering B; otherwise, entering C;
b: the SOC state of the power battery 6 is further determined. If SOC is in the power battery 6batteryGreater than a set minimum threshold SOClowEntering an engine and motor combined driving mode; otherwise, entering an engine direct drive mode;
c: further judging the SOC state of the power battery 6 and the energy accumulator 3. If the SOC of the power battery 6batteryLess than a set maximumThreshold SOChighOr SOC of the accumulator 3haIf the current value is less than 1, entering a driving energy charging mode; otherwise, the engine direct drive mode is entered.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
The above description is only an example of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (2)

1. A control method for a timely four-wheel drive system of a hybrid electric vehicle is characterized by comprising the following steps:
the method comprises the following steps: the driver judges whether the mechanical transmission system is damaged or not according to the driving feedback of the whole vehicle; if the mechanical system is damaged, the whole vehicle is switched to a crawling mode; if the mechanical system is not damaged, entering a second step;
step two: judging whether the opening degree of a brake pedal is larger than 0; if the opening degree of the brake pedal is larger than 0, the whole vehicle is in a brake mode, and entering a third step; otherwise, the whole vehicle is in a driving mode, and then the step four is carried out;
step three: entering a step three, representing that the whole vehicle is in a braking mode, and further judging the SOC states of the power battery (6) and the energy accumulator (3); if the SOC of the power battery (6)batteryLess than a set maximum threshold SOChighOr SOC of the accumulator (3)haIf the brake recovery rate is less than 1, entering a brake recovery mode; otherwise, entering a mechanical braking mode;
step four: entering a step four, representing that the whole vehicle is in a driving mode, and further judging whether the whole vehicle is in an initial starting stage; if the whole vehicle is in the initial starting stage, entering the step five; otherwise, entering the step six;
step five: entering a step five, representing that the whole vehicle is in an initial starting stage, and further judging the SOC state of the power battery (6); if the SOC of the power battery (6)batteryGreater than a set minimum threshold SOClowEntering a pure electric mode; otherwise, entering an engine direct drive mode；
Step six: entering a sixth step, namely the whole vehicle is not in an initial starting stage, and further judging whether the vehicle speed v of the whole vehicle is greater than the maximum vehicle speed v of the hydraulic component1(ii) a If v is greater than v1If so, stopping the work of the hydraulic component and entering a seventh step; otherwise, the hydraulic system can continue to work, and the step eight is entered;
step seven: entering a step seven, representing that the hydraulic system of the whole vehicle stops working, and further judging whether the speed v of the whole vehicle is greater than the maximum speed v of the economical driving2(ii) a If v is less than v2Entering an economic driving mode; otherwise, entering an engine direct drive mode;
step eight: step eight is entered, the hydraulic system can still continue to work at the current vehicle speed of the whole vehicle, and the rear wheel slip ratio S is further judgedrearWhether or not it is greater than a given threshold S1And whether the accelerator Pedal opening degree Pedal is greater than a given threshold value Pedalthre(ii) a If SrearGreater than a given threshold S1Or Pedal is greater than a given threshold PedalthreEntering a four-wheel drive mode; otherwise, the economical driving mode is entered.
2. The control method for a hybrid electric vehicle timely four-wheel drive system according to claim 1, characterized in that:
in the seventh step and the eighth step, when the whole vehicle is in the economic driving mode:
a: looking up a table to obtain the optimal point power P of the engine at the current rotating speedengAnd estimating the required power P according to the opening degree of the accelerator pedalreqFurther comparing the sizes of the two; if the engine has the optimal point power PengLess than the required power PreqEntering B; otherwise, entering C;
b: further judging the SOC state of the power battery (6); if SOC in the power battery (6)batteryGreater than a set minimum threshold SOClowEntering an engine and motor combined driving mode; otherwise, entering an engine direct drive mode;
c: further judging the SOC states of the power battery (6) and the energy accumulator (3); if the power battery (6)) SOC (1)batteryLess than a set maximum threshold SOChighOr SOC of the accumulator (3)haIf the current value is less than 1, entering a driving energy charging mode; otherwise, the engine direct drive mode is entered.
CN202010004687.1A 2020-01-03 2020-01-03 Control method for timely four-wheel drive system of hybrid electric vehicle Pending CN111152643A (en)

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