CN111890915B - Hybrid power drive system and method - Google Patents

Hybrid power drive system and method Download PDF

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Publication number
CN111890915B
CN111890915B CN201910370993.4A CN201910370993A CN111890915B CN 111890915 B CN111890915 B CN 111890915B CN 201910370993 A CN201910370993 A CN 201910370993A CN 111890915 B CN111890915 B CN 111890915B
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China
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gear
clutch
engine
motor
power
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CN111890915A (en
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周文太
朱永明
祁宏钟
罗宇亮
涂序聪
魏丹
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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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
    • B60K6/38—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
    • B60K6/44—Series-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
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/44—Series-parallel type
    • B60K6/442—Series-parallel switching 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
    • B60K6/54—Transmission for changing ratio
    • 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
    • B60K2006/381—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 characterized by driveline brakes
    • 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)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

A hybrid power driving system comprises an engine, a first clutch, an input shaft, a first motor, a planetary gear device, a second clutch, a braking device, an intermediate shaft, a second motor and a differential mechanism, wherein the planetary gear device comprises a sun gear, a planet carrier and a gear ring; the planet carrier is connected with the intermediate shaft; the second motor is connected with the intermediate shaft; the first clutch is combined with or separated from the engine and the input shaft, the second clutch is combined with or separated from the sun gear and the gear ring, and the brake device brakes or unlocks the sun gear; when the first clutch is combined with the engine and the input shaft and the brake device unlocks the sun gear, the power of the engine is calculated according to the running condition of the whole vehicle, the target rotating speed is called, the engine works at the target rotating speed, and the first clutch is controlled to be in a sliding friction state. The hybrid power driving system can avoid the problem of gear knocking. The invention also relates to a hybrid power driving method.

Description

Hybrid power drive system and method
Technical Field
The invention relates to the technical field of new energy, in particular to a hybrid power driving system and a method.
Background
Due to the fact that the combustion torque of the engine is uneven, the cylinder pressure of the engine pulsates along with the stroke, the torque of the engine pulsates and the rotation speed of the engine fluctuates, the rotation speed fluctuation is difficult to completely eliminate by a torsional damper or a dual-mass flywheel, and the rotation speed fluctuation is transmitted to the hybrid electromechanical coupling device after passing through the torsional damper or the dual-mass flywheel.
The gear is a common power transmission device in the hybrid electromechanical coupling device, because the gear transmission generates heat, the gear is heated and expanded to cause tooth surface abrasion, and in order to ensure the service life of the gear, a certain gear gap is required to be kept between the gears which are meshed with each other.
Because of the gear clearance, the fluctuation of the rotating speed of the engine is transmitted to the hybrid electromechanical coupling device and the rotating speed of the gear in the device also fluctuates, so that the idle driven gear in the device is contacted with the driving gear sometimes and separated sometimes, the gear knocking problem is further generated, and the adverse effect is caused on the experience of a driver and passengers.
Disclosure of Invention
Accordingly, the present invention is directed to a hybrid drive system, which can avoid the problem of gear rattle when the engine inputs power and the sun gear is in an idle state.
A hybrid drive system comprising an engine, a first clutch, an input shaft, a first motor, a planetary gear arrangement, a second clutch, a brake arrangement, an intermediate shaft, a second motor, and a differential, the planetary gear arrangement comprising a sun gear, a planet carrier, and a ring gear, wherein: the engine is connected with the input shaft through the first clutch, and the first motor is connected with the input shaft;
the planet carrier is connected with the intermediate shaft;
the second motor is connected with the intermediate shaft;
the intermediate shaft is connected with the differential;
the first clutch is used for combining or separating the engine and the input shaft, the second clutch is used for combining or separating the sun gear and the gear ring, and the braking device is used for braking or unlocking the sun gear;
when the first clutch is combined with the engine and the input shaft and the brake device unlocks the sun gear, the power of the engine is calculated according to the running condition of the whole vehicle, the target rotating speed corresponding to the power is obtained according to the power regulation, the rotating speed fluctuation is minimum when the engine works under the target rotating speed, and the input end and the output end of the first clutch are controlled to be in a sliding friction state.
In an embodiment of the present invention, an input end of the first clutch is connected to the engine, an output end of the first clutch is connected to the input shaft, and when the input end and the output end of the first clutch are in a sliding friction state, the first motor is used to adjust a rotation speed of the output end, so that a rotation speed difference between the input end and the output end is within a set range.
In the embodiment of the invention, the formula for calculating the power of the engine according to the running condition of the whole vehicle is as follows:
PEngine_req＝FreqV+PBattery_req+PCompressor+PAccessary
wherein, PEngine_reqIs the engine power; freqIs the throttle opening; v is the vehicle speed; pBattery_reqCharging power for the power battery; pCompressorThe power of the air conditioner compressor; pAccessaryThe power of the electronic devices of the whole vehicle.
In an embodiment of the present invention, a first gear and a second gear are fixedly disposed on the intermediate shaft, a differential gear is disposed on the differential, the first gear is engaged with the planet carrier, and the second gear is engaged with the differential gear.
In an embodiment of the present invention, the second motor has a second motor output shaft, and a third gear is fixedly disposed on the second motor output shaft, and the third gear is meshed with the first gear.
In an embodiment of the present invention, the first motor has a first motor output shaft, a fourth gear is fixedly disposed on the first motor output shaft, a fifth gear is fixedly disposed on the input shaft, and the fourth gear and the fifth gear are engaged with each other.
In an embodiment of the present invention, the hybrid drive system has a dual-motor electric-only first-gear mode and a dual-motor electric-only second-gear mode, in the dual-motor electric-only first-gear mode, the first clutch is disengaged, the second clutch is disengaged, the brake device brakes the sun gear, and the first motor and the second motor drive the sun gear; in the dual-motor pure electric second-gear mode, the first clutch is separated, the second clutch is combined, the sun gear is unlocked by the braking device, and the first motor and the second motor drive the sun gear.
In an embodiment of the present invention, the hybrid drive system has a parallel hybrid first-gear mode in which the first clutch is engaged, the second clutch is disengaged, the sun gear is braked by the brake device, and the engine, the first motor, and the second motor drive the sun gear; the hybrid power driving system has a parallel hybrid two-gear mode, in which the first clutch is engaged, the second clutch is engaged, and the brake device unlocks the sun gear and is driven by the engine, the first motor, and the second motor.
In an embodiment of the present invention, the hybrid drive system has a series hybrid mode in which the first clutch is engaged, the second clutch is disengaged, the sun gear is unlocked by the brake device, the engine drives the first motor to generate electric power, and the second motor drives the first motor to generate electric power.
The present invention also provides a hybrid driving method using the above hybrid driving system, the hybrid driving method including:
when the first clutch is combined with the engine and the input shaft, and the brake device unlocks the sun gear, the power of the engine is calculated according to the running condition of the whole vehicle, the target rotating speed corresponding to the power is obtained according to the power regulation, the rotating speed fluctuation of the engine is minimum when the engine works under the target rotating speed, and the input end and the output end of the first clutch are controlled to be in a sliding friction state.
In an embodiment of the present invention, the hybrid driving method further includes:
selecting a working mode of the hybrid power driving system, wherein when the hybrid power driving system is in a series hybrid mode, the first clutch is combined, the second clutch is separated, the sun gear is unlocked by the braking device, and the engine drives the first motor to generate power and is driven by the second motor;
detecting the current vehicle speed; and when the vehicle speed is less than the threshold value, controlling the engine to work at the target rotating speed, and controlling the input end and the output end of the first clutch to be in a sliding friction state.
The hybrid power driving system can avoid the problem of gear knocking when the engine inputs power and the sun gear is in an idle state.
Drawings
Fig. 1 is a schematic configuration diagram of a hybrid drive system of the present invention.
FIG. 2 is a lever diagram schematic of the hybrid drive system of the present invention in a series hybrid mode.
FIG. 3 is a schematic flow chart of the hybrid drive method of the present invention for optimizing gear rattle.
Detailed Description
Fig. 1 is a schematic structural diagram of a hybrid drive system of the present invention, and as shown in fig. 1, the hybrid drive system includes an engine 11, a first clutch 12, an input shaft 13, a first electric machine 14, a planetary gear device 15, a second clutch 16, a brake device 17, an intermediate shaft 18, a second electric machine 19, a differential 20, and a power battery (not shown). The planetary gear device 15 includes a sun gear 151, a carrier 152, and a ring gear 153.
The engine 11 is connected to the input shaft 13 through the first clutch 12, and the first electric machine 14 is connected to the input shaft 13. The first clutch 12 is used for coupling or decoupling the engine 11 and the input shaft 13, and specifically, an input end 121 of the first clutch 12 is connected to the engine 11, and an output end 122 of the first clutch 12 is connected to the input shaft 13. When the first clutch 12 is engaged, the power of the engine 11 can be transmitted to the input shaft 13; when the first clutch 12 is disengaged, the engine 11 is disconnected from the input shaft 13. In the present embodiment, the engine 11 is a gasoline engine or a diesel engine, and the first electric machine 14 is a drive and power generation integrated machine.
The first motor 14 has a first motor output shaft 141, a fourth gear 142 is fixedly disposed on the first motor output shaft 141, a fifth gear 131 is fixedly disposed on the input shaft 13, and the fourth gear 142 and the fifth gear 131 are engaged with each other.
The ring gear 153 is fixed to the input shaft 13 so that the input shaft 13 and the ring gear 153 can rotate synchronously. The planet carrier 152 is provided with planet wheels 154, the planet wheels 154 are connected to the planet carrier 152 through rolling bearings or sliding bearings, and the planet wheels 154 are meshed with the sun gear 151 and the ring gear 153 respectively.
The second clutch 16 is used to couple or decouple the sun gear 151 and the ring gear 153. When the second clutch 16 is engaged, the sun gear 151 and the ring gear 153 are locked together; when the second clutch 16 is disengaged, the sun gear 151 and the ring gear 153 are disengaged from each other.
The brake device 17 is used to brake or unlock the sun gear 151. The braking device 17 is, for example, a brake or a one-way clutch. When the brake device 17 brakes the sun gear 151, the sun gear 151 is fixed against rotation with respect to the input shaft 13; when the brake 17 unlocks the sun gear 151, the sun gear 151 can rotate relative to the input shaft 13.
The planet carrier 152 is connected with the intermediate shaft 18, specifically, a first gear 181 and a second gear 182 are fixedly arranged on the intermediate shaft 18, the first gear 181 and the second gear 182 are arranged at intervals, and the first gear 181 is meshed with the planet carrier 152.
The second motor 19 is connected with the intermediate shaft 18, specifically, the second motor 19 is arranged in parallel with the first motor 14, the second motor 19 has a second motor output shaft 191, a third gear 192 is fixedly arranged on the second motor output shaft 191, and the third gear 192 is meshed with the first gear 181. In the present embodiment, the second motor 19 is a driving and power generating integrated machine.
The intermediate shaft 18 is connected with a differential 20, specifically, a differential gear 201 is arranged on the differential 20, and the differential gear 201 is meshed with the second gear 182. The differential 20 is used for adjusting the difference between the rotating speeds of the left wheel and the right wheel, so that the left wheel and the right wheel roll at different rotating speeds when the automobile turns or runs on an uneven road surface, and the pure rolling motion of the wheels driven by the two sides is ensured.
The power battery is electrically connected with the first motor 14 and the second motor 19 respectively. The power battery supplies electric energy for driving the first electric motor 14 and the second electric motor 19, and the electric energy generated when the first electric motor 14 and the second electric motor 19 are driven to rotate can be stored in the power battery.
In the embodiment, when the first clutch 12 couples the engine 11 and the input shaft 13, and the brake device 17 unlocks the sun gear 151, the power of the engine 11 is calculated according to the running condition of the whole vehicle, a target rotation speed corresponding to the power is obtained according to the power adjustment, the rotation speed fluctuation is minimal when the engine 11 operates at the target rotation speed, the input end 121 and the output end 122 of the first clutch 12 are controlled to be in a sliding friction state, and when the input end 121 and the output end 122 of the first clutch 12 are in the sliding friction state, the rotation speed of the output end 122 is adjusted by the first motor 14, so that the rotation speed difference between the input end 121 and the output end 122 is within a set range, preferably, the rotation speed difference is within a range of 50rpm to 300rpm, and overheating or burning phenomena caused by an excessively large rotation speed difference between the two ends of the first clutch 12 can be avoided. Since the fluctuation of the rotational speed is minimum when the engine is operated at the target rotational speed, the fluctuation of the rotational speed is blocked when being transmitted to the input end 121 and the output end 122 which are in the sliding friction state, that is, the fluctuation of the rotational speed cannot be transmitted to the planetary gear device 15, and the NVH problems such as gear rattling can be effectively avoided.
The hybrid power driving system has a dual-motor pure electric first gear mode, a dual-motor pure electric second gear mode, a parallel hybrid first gear mode, a parallel hybrid second gear mode and a series hybrid mode.
Specifically, in the two-motor electric-only first-gear mode, the first clutch 12 is disengaged, the second clutch 16 is disengaged, the sun gear 151 is braked by the brake device 17, the engine 11 is not started, and the first motor 14 and the second motor 19 are driven. The power transmission has two paths, wherein the first path is transmitted to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20 and finally the wheels 30 by the first motor 14 through the gear ring 153 and the planet carrier 152; path two is transmitted by the second motor 19 through the third gear 192 to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally to the wheels 30.
In the two-motor electric-only second-gear mode, the first clutch 12 is disengaged, the second clutch 16 is engaged, the sun gear 151 is unlocked by the brake device 17, the engine 11 is not started, and the first motor 14 and the second motor 19 drive the engine. At this time, since the second clutch 16 is engaged, the carrier 152 and the ring gear 153 are locked together, so that the entire planetary gear device is fixedly connected as a unit and integrally rotated at a speed ratio of 1. The power transmission has two paths, wherein the first path is transmitted to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20 and finally the wheels 30 by the first motor 14 through the whole planetary gear device 15; path two is transmitted by the second motor 19 through the third gear 192 to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally to the wheels 30.
In the parallel hybrid first-speed mode, the first clutch 12 is engaged, the second clutch 16 is disengaged, and the sun gear 151 is braked by the brake device 17 and driven by the engine 11, the first electric machine 14, and the second electric machine 19. The power transmission has three paths, wherein the path one is transmitted from the engine 11 to the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20 and finally to the wheels 30 through the input shaft 13, the gear ring 153, the planet carrier 152 and the first gear 181; path two, the first motor 14 transmits the power to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally the wheels 30 through the ring gear 153 and the planet carrier 152; path three is transmitted by the second motor 19 through the third gear 192 to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally to the wheels 30.
In the parallel hybrid second-speed mode, the first clutch 12 is engaged, the second clutch 16 is engaged, the sun gear 151 is unlocked by the brake device 17, and the engine 11, the first electric machine 14, and the second electric machine 19 are driven. At this time, since the second clutch 16 is engaged, the carrier 152 and the ring gear 153 are locked together, so that the entire planetary gear device is fixedly connected as a unit and integrally rotated at a speed ratio of 1. The power transmission has three paths, wherein the path one is transmitted from the engine 11 to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20 and finally to the wheels 30 through the whole planetary gear device; path two, from the first electric machine 14 through the whole planetary gear to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally to the wheels 30; path three is transmitted by the second motor 19 through the third gear 192 to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally to the wheels 30.
Fig. 2 is a lever diagram of the hybrid drive system of the present invention in the series hybrid mode, in which the first clutch 12 is engaged, the second clutch 16 is disengaged, the brake device 17 unlocks the sun gear 151, the engine 11 is started and drives the first electric machine 14 to generate electricity, and the first electric machine 14 supplies electric power to the second electric machine 19 and is driven by the second electric machine 19, as shown in fig. 1 and 2. The electric energy generated by the engine 11 driving the first electric machine 14 to rotate can also be stored in a power battery, and the power battery provides the electric energy required by the second electric machine 19. The power transmission has a path from the second electric machine 19 through the third gear 192 to the first gear 181, the intermediate shaft 18, the second gear 182, the differential gear 201, the differential 20, and finally to the wheels 30. When the hybrid drive system operates in the series hybrid mode, the sun gear 151 is in an idling state, and in order to avoid NVH problems such as gear rattling between the sun gear 151 and the planetary gears 154, the engine 11 is controlled to operate at a target rotational speed, and the input end 121 and the output end 122 of the first clutch 12 are controlled to be in a sliding friction state, and the transmission of rotational speed fluctuations to the input end 121 and the output end 122 in the sliding friction state is blocked.
The hybrid power driving system provided by the embodiment of the invention has a double-motor pure electric first-gear mode, a double-motor pure electric second-gear mode, a parallel hybrid first-gear mode, a parallel hybrid second-gear mode and a series hybrid mode, and can automatically realize the switching of different modes according to the SOC (residual electric quantity) value of a power battery and the vehicle speed requirement. For example, judging the magnitude relation between the SOC value of the power battery and a first threshold value, or simultaneously judging the magnitude relation between the SOC value of the power battery and the first threshold value and the magnitude relation between the vehicle speed and a second threshold value; and switching the working mode of the hybrid power driving system according to the judgment result. It should be noted that the first threshold is used to determine the SOC value of the power battery, and the second threshold is used to determine the vehicle speed, and the embodiment does not limit the value ranges of the first threshold and the second threshold, and may be freely set according to a specific control strategy, and the values of the first threshold and the second threshold are different under different control strategies. After the first threshold value and the second threshold value are set, automatic judgment is carried out, and automatic switching is carried out among various modes according to the judgment result.
The present invention also relates to a hybrid driving method using the above hybrid driving system, the hybrid driving method including:
when the first clutch 12 is combined with the engine 11 and the input shaft 13, and the brake device 17 unlocks the sun gear 151, calculating the power of the engine 11 according to the running condition of the whole vehicle, taking out a target rotating speed corresponding to the power according to power regulation, controlling the input end 121 and the output end 122 of the first clutch 12 to be in a sliding friction state when the engine 11 works at the target rotating speed and controlling the rotating speed fluctuation to be minimum;
when the input end 121 and the output end 122 of the first clutch 12 are in a sliding friction state, the rotation speed of the output end 122 is adjusted by the first motor 14, so that the difference between the rotation speeds of the input end 121 and the output end 122 is within a set range.
Specifically, fig. 3 is a schematic flow chart of the hybrid driving method of the present invention for optimizing gear rattle, as shown in fig. 1 and 3, the hybrid driving method further includes:
step one, selecting a working mode of the hybrid power driving system.
The hybrid power driving system is provided with a double-motor pure electric first gear mode, a double-motor pure electric second gear mode, a parallel hybrid first gear mode, a parallel hybrid second gear mode and a series hybrid mode; when the power battery is sufficient in electric quantity, low in speed, medium and small in torque working conditions or medium speed and small torque working conditions, a pure electric mode is selected, and switching is performed between a double-motor pure electric first-gear mode and a double-motor pure electric second-gear mode according to the accelerator opening of a driver; when the power battery is in low electric quantity, low vehicle speed, medium and small torque working conditions or medium vehicle speed and small torque working conditions, a series hybrid mode is selected; and when the working condition of large torque or high vehicle speed is adopted, the parallel hybrid mode is selected, and the parallel hybrid first-gear mode and the parallel hybrid second-gear mode are switched according to the opening degree of the accelerator of the driver.
And step two, judging whether the current mode is a series hybrid mode.
When the hybrid mode is the series hybrid mode, executing gear knocking optimization control; and when the hybrid mode is not the series hybrid mode, the gear knocking optimization control is quitted.
And step three, detecting the current vehicle speed.
The wind noise, the tire noise and the road noise of the whole vehicle are larger as the vehicle speed is higher, and when the vehicle speed is greater than or equal to a threshold value, the wind noise, the tire noise and the road noise of the whole vehicle completely cover the gear knocking sound, the gear knocking optimization control is not required to be implemented, and the gear knocking optimization control process is quitted; when the vehicle speed is less than the threshold value, a gear rattle optimization control process is performed, that is, the engine 11 is controlled to operate at the target rotation speed, and the input end 121 and the output end 122 of the first clutch 12 are controlled to be in a sliding friction state.
And step four, sending a rotating speed fluctuation suppression request to an Engine Management System (EMS).
Since the combustion state of the engine 11, the rotational speed fluctuation, and the operating point of the engine 11 are related, the engine power PEngineWith the speed of rotation omegaEngineTorque TEngineThe following relationships exist:
PEngine＝ωEngine·TEngine
the operating point of the engine 11 is adjusted to change the fluctuation of the rotating speed of the engine 11, and under the designated engine power, an optimal operating point of the rotating speed and the torque of the engine exists, so that the fluctuation of the rotating speed of the engine is minimum; calculating the power P of the engine 11 according to the running condition of the whole vehicleEngine_reqEngine power PEngine_reqCalculated according to the following formula:
PEngine_req＝FreqV+PBattery_req+PCompressor+PAccessary
wherein, FreqTo meet the needThe whole vehicle driving force is obtained by looking up a table according to the accelerator opening APS and the vehicle speed V; pBattery_reqThe charging power for charging the power battery is obtained by looking up a table according to the SOC of the power battery, and the lower the SOC is, the higher the required battery charging power is; pCompressorIs the power of the air conditioning compressor; pAccessaryThe power of the electronic devices of the whole vehicle.
Freq＝f(APS，V)
PBattery_req＝f(SOC)
When a Vehicle Control Unit (VCU) sends a request for suppressing the rotational speed fluctuation and a request for engine power to the EMS, and after the EMS receives the request for suppressing the rotational speed fluctuation and the request for engine power, the EMS controls the engine 11 to operate at a rotational speed and torque operating point at which the engine rotational speed fluctuation is the lowest under the engine power requested by the VCU.
It should be noted that the operating point is calibrated by using a real vehicle, that is, the engine 11 is controlled to operate under a plurality of engine powers, a target rotating speed with minimum rotating speed fluctuation under each engine power is calibrated, the calibrated target rotating speeds are stored, when the gear knocking optimization control is implemented, the power of the engine 11 is calculated according to the running condition of the whole vehicle, the corresponding target rotating speed is obtained according to the power regulation, and the engine 11 is controlled to operate according to the target rotating speed through the EMS.
Step five, the VCU implements first clutch 12 micro-slip control.
The first motor 14 PI-controls the rotation speed of the output end 122 of the first clutch 12 to keep the difference between the rotation speeds of the input end 121 and the output end 122 of the first clutch 12 within a predetermined range, preferably, within a range of 50rpm to 300 rpm.
Specifically, although the engine 11 is at the target rotation speed nEngine_reqThe lower operation is smooth and low in fluctuation, but since the input end 121 of the first clutch 12 is connected to the engine 11, the input end 121 of the first clutch 12 rotates at the target speed n of the engine 11Engine_reqWhich is a center line, fluctuates as the rotation speed of the engine 11 fluctuates. In order to keep the rotational speed of the output 122 of the first clutch 12 constant, the output 1 is driven by the first electric machine 1422 perform a rotational speed PT control. The VCU receives the rotational speed n of the first electric machine 14 from the motor controller (PCU)EM1The speed n of the output 122 of the first clutch 12 is calculated from the gear ratioRingAnd calculate nRingWith the target speed n of the engine 11Engine_req(i.e., the speed of rotation of input 121) of the difference enAnd finally e is calculated based on PI control algorithmnThe control is in a set range. The VCU will derive a torque request T for the first electric machine 14 based on the PI control algorithmEM1Sending the request to a PCU, and the PCU executing the request of a VCU; t is calculated according to the following formulaEM1：
nRing＝nEM1iEM1
en＝nRing-nEngine_req
Figure BDA0002049927520000111
Wherein iEM1Is a gear transmission ratio; t isEM1_LastValueThe first electric machine 14 torque calculated for the previous moment; kPIs a proportionality coefficient; t isIIs an integral coefficient.
By keeping the difference in the rotational speed between the input 121 and the output 122 of the first clutch 12 constant, the problem of gear rattling can be avoided.
In summary, the hybrid power driving system provided by the embodiment of the invention has a simpler overall structure, can realize a dual-motor pure electric first gear mode, a dual-motor pure electric second gear mode, a parallel hybrid first gear mode, a parallel hybrid second gear mode and a series hybrid mode, and has stronger flexibility. When the operation mode is switched, the second motor 19 is driven, and there is no interruption in power. Further, the hybrid drive system of the present invention can avoid the problem of gear rattle when the engine 11 inputs power and the sun gear 151 is in an idle state. The hybrid power driving system of the invention does not need to adjust the torque of the second motor 19 coupled with the wheel end, has little influence on the drivability and ensures the stable running of the vehicle. The hybrid power driving system can be applied to two-wheel drive vehicles or four-wheel drive vehicles, and is good in platformization.
The above embodiments are only examples of the present invention and are not intended to limit the scope of the present invention, and all equivalent changes and modifications made according to the contents described in the claims of the present invention should be included in the claims of the present invention.

Claims (11)

1. Hybrid drive system, comprising an engine (11), a first clutch (12), an input shaft (13), a first electric machine (14), a planetary gear (15), a second clutch (16), a braking device (17), an intermediate shaft (18), a second electric machine (19) and a differential (20), the planetary gear (15) comprising a sun gear (151), a planet carrier (152) and a ring gear (153), wherein:
the engine (11) is connected with the input shaft (13) through the first clutch (12), the first motor (14) is connected with the input shaft (13), and the gear ring (153) is connected with the input shaft (13);
the planet carrier (152) is connected with the intermediate shaft (18);
the second motor (19) is connected with the intermediate shaft (18);
the intermediate shaft (18) is connected with the differential (20);
the first clutch (12) is used for combining or separating the engine (11) and the input shaft (13), the second clutch (16) is used for combining or separating the sun gear (151) and the ring gear (153), and the braking device (17) is used for braking or unlocking the sun gear (151);
when the first clutch (12) is combined with the engine (11) and the input shaft (13), and the brake device (17) unlocks the sun gear (151), the power of the engine (11) is calculated according to the running condition of the whole vehicle, the target rotating speed corresponding to the power is obtained according to the power regulation, the rotating speed fluctuation of the engine (11) is minimum when the engine works under the target rotating speed, and the input end (121) and the output end (122) of the first clutch (12) are controlled to be in a sliding friction state.
2. A hybrid drive system according to claim 1, wherein the input (121) of the first clutch (12) is connected to the engine (11), the output (122) of the first clutch (12) is connected to the input shaft (13), and the rotational speed of the output (122) is adjusted by the first electric machine (14) so that the difference in rotational speed between the input (121) and the output (122) is within a set range when the input (121) and the output (122) of the first clutch (12) are in a slip friction state.
3. Hybrid drive system according to claim 1, characterized in that the formula for calculating the power of the engine (11) according to the vehicle operating conditions is as follows:
PEngine_req＝FreqV+PBattery_req+PCompressor+PAccessary
wherein, PEngine_reqIs the engine power; freqIs the throttle opening; v is the vehicle speed; pBattery_reqCharging power for the power battery; pCompressorThe power of the air conditioner compressor; pAccessaryThe power of the electronic devices of the whole vehicle.
4. Hybrid drive system according to claim 1, characterized in that a first gear (181) and a second gear (182) are fixedly arranged on the intermediate shaft (18), a differential gear (201) is arranged on the differential (20), the first gear (181) is in mesh with the planet carrier (152), and the second gear (182) is in mesh with the differential gear (201).
5. Hybrid drive system according to claim 4, characterized in that the second electric machine (19) has a second electric machine output shaft (191), a third gear (192) being fixedly arranged on the second electric machine output shaft (191), the third gear (192) being in mesh with the first gear (181).
6. Hybrid drive system according to claim 5, characterized in that the first electric machine (14) has a first electric machine output shaft (141), a fourth gear (142) is fixedly arranged on the first electric machine output shaft (141), a fifth gear (131) is fixedly arranged on the input shaft (13), and the fourth gear (142) and the fifth gear (131) are mutually meshed.
7. Hybrid drive system according to any one of claims 1 to 6, characterized in that it has a dual-motor electric-only first gear mode, in which said first clutch (12) is disengaged, said second clutch (16) is disengaged, said braking means (17) brakes said sun wheel (151), driven by said first electric machine (14) and said second electric machine (19); in the dual-motor electric-only second-gear mode, the first clutch (12) is separated, the second clutch (16) is combined, the sun gear (151) is unlocked by the braking device (17), and the first motor (14) and the second motor (19) drive the sun gear.
8. Hybrid drive system according to any one of claims 1 to 6, characterized in that it has a parallel hybrid first gear mode in which said first clutch (12) is engaged, said second clutch (16) is disengaged, said braking means (17) brakes said sun gear (151), driven by said engine (11), said first electric machine (14) and said second electric machine (19); the hybrid drive system has a parallel hybrid second-speed mode in which the first clutch (12) is engaged, the second clutch (16) is engaged, and the brake device (17) unlocks the sun gear (151) and is driven by the engine (11), the first motor (14), and the second motor (19).
9. Hybrid drive system according to any one of claims 1 to 6, characterized in that it has a series hybrid mode in which said first clutch (12) is engaged, said second clutch (16) is disengaged, said braking device (17) unlocks said sun gear (151), said engine (11) drives said first electric machine (14) for generating electric power, driven by said second electric machine (19).
10. A hybrid driving method that utilizes the hybrid driving system according to any one of claims 1 to 9, the hybrid driving method comprising:
when the first clutch (12) is combined with the engine (11) and the input shaft (13), and the brake device (17) unlocks the sun gear (151), the power of the engine (11) is calculated according to the running condition of the whole vehicle, the target rotating speed corresponding to the power is obtained according to the power regulation, the rotating speed fluctuation of the engine (11) is minimum when the engine works under the target rotating speed, and the input end (121) and the output end (122) of the first clutch (12) are controlled to be in a sliding friction state.
11. The hybrid driving method according to claim 10, further comprising:
selecting an operating mode of the hybrid drive system, wherein when the hybrid drive system is in a series hybrid mode, the first clutch (12) is engaged, the second clutch (16) is disengaged, the sun gear (151) is unlocked by the braking device (17), and the engine (11) drives the first motor (14) to generate electricity and the second motor (19) to drive the first motor;
detecting the current vehicle speed; and when the vehicle speed is less than the threshold value, controlling the engine (11) to work at the target rotating speed, and controlling the input end (121) and the output end (122) of the first clutch (12) to be in a sliding friction state.
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