WO2018108053A1 - Vehicle, series-parallel hybrid power system, and method for controlling hybrid power system - Google Patents

Vehicle, series-parallel hybrid power system, and method for controlling hybrid power system Download PDF

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Publication number
WO2018108053A1
WO2018108053A1 PCT/CN2017/115499 CN2017115499W WO2018108053A1 WO 2018108053 A1 WO2018108053 A1 WO 2018108053A1 CN 2017115499 W CN2017115499 W CN 2017115499W WO 2018108053 A1 WO2018108053 A1 WO 2018108053A1
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WIPO (PCT)
Prior art keywords
pure electric
motor
vehicle
electric mode
speed
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PCT/CN2017/115499
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French (fr)
Chinese (zh)
Inventor
王印束
刘小伟
王兴
王富生
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郑州宇通客车股份有限公司
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Publication of WO2018108053A1 publication Critical patent/WO2018108053A1/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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
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    • 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
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    • B60K6/387—Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
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    • 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
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    • B60W20/30—Control strategies involving selection of transmission gear ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B60K2006/4833—Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range
    • B60K2006/4841—Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range the gear provides shifting between multiple ratios
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/244—Charge state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/12—Brake pedal position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/02—Clutches
    • B60W2710/021—Clutch engagement state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/10—Change speed gearings
    • B60W2710/1005—Transmission ratio engaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2720/00—Output or target parameters relating to overall vehicle dynamics
    • B60W2720/40—Torque distribution
    • 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

Definitions

  • Hybrid hybrid systems offer tremendous performance advantages over series hybrid systems and parallel hybrid systems.
  • An existing hybrid hybrid system such as the hybrid system disclosed in Chinese Patent No. CN105857054A, entitled “Hybrid Power System and Hybrid Vehicle Using the System”, the hybrid system includes The planetary gear mechanism couples the driven engine, the generator (ie, the first motor), and the hybrid system further includes a power generating brake (ie, a lock) for braking the rotor of the generator, and a driving motor (ie, the second motor) And a shifting mechanism connected to the rotor of the driving motor, the shifting mechanism is connected to the system output shaft, and a clutch is disposed between the system output shaft and the planetary gear mechanism.
  • a power generating brake ie, a lock
  • driving motor ie, the second motor
  • a shifting mechanism connected to the rotor of the driving motor, the shifting mechanism is connected to the system output shaft, and a clutch is disposed between the system output shaft and the planetary gear mechanism.
  • the hybrid system can implement a variety of control modes, such as pure electric mode, engine series power generation mode, engine driving power generation mode, engine direct drive mode, etc., but the existing hybrid system still has many deficiencies, such as pure
  • the electric mode condition is: when the vehicle is running at low speed or small load, the clutch is disengaged, the driving motor is driven by the speed reduction mechanism to increase the torque, and the vehicle is driven to rotate, and the vehicle is driven in the pure electric driving mode to avoid the engine being idling due to the low speed running. High fuel consumption.
  • pure electric mode of the existing hybrid system there is only one mode of speed reduction and twisting.
  • the object of the present invention is to provide a hybrid hybrid power system control method for solving the single problem of the pure electric mode in the prior art; and an object of the present invention is to provide a hybrid power system dedicated to implementing the above hybrid power system.
  • a hybrid hybrid system comprising a second motor, a shifting mechanism coupled to the second motor, and an engine coupled by the planetary gear mechanism, the first motor and the system output shaft, and a shift between the system output shaft and the second motor
  • the device, the shifting device can realize the gear shifting of the shifting mechanism during the operation.
  • the shifting device also has a neutral position, and a first lock-up clutch is disposed on the transmission path of the engine and the planetary gear mechanism, and a second lock-up clutch is disposed on the transmission path of the first motor and the planetary gear mechanism.
  • the pure electric mode includes a first pure electric mode in which the first motor and the second motor are both in an electric state, a second pure electric mode in which only the first motor is in an electric state, and a third pure in which the second motor is in an electric state only The electric mode; the first motor output maximum power P 1 is smaller than the second motor output maximum power P 2 , P 2 >P 1 ;
  • the high speed pure electric mode includes a high speed first pure electric mode and a high speed third pure electric mode
  • the criteria for determining that the vehicle is in the second pure electric mode include:
  • the P demand is the vehicle demand power
  • the V pure electric H is the maximum vehicle speed of the vehicle in the pure electric mode.
  • the criteria for determining that the vehicle is in the third pure electric mode include:
  • the criteria 1), 4) are the relationship, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed of the vehicle in the pure electric mode.
  • the beneficial effects of the present invention are: in the pure electric mode, if the current vehicle speed is less than the vehicle speed threshold, the shifting device moves in the low gear position, that is, the speed increasing torque-increasing gear position, and the power of the second motor is output through the shifting mechanism to achieve the speed increase. Twist, if the current vehicle speed is greater than the vehicle speed threshold, the shifting device is operated, the shifting device is in the high gear position, and the power of the second motor is increased or decreased by the shifting mechanism or directly outputted without the shifting mechanism to ensure the working efficiency of the second motor. .
  • the second lock-up clutch is locked to realize the direct drive mode of the engine, and the shifting mechanism is operated by the shifting device to avoid the efficiency loss caused by the high-speed follow-up of the second motor. Improve the efficiency of direct drive.
  • FIG. 1 is a schematic structural view of an embodiment of a hybrid hybrid power system of the present invention
  • FIG. 2 is a control logic diagram of an embodiment of a hybrid system control method of the present invention.
  • the vehicle is implemented as shown in FIG. 1 : including a frame and a hybrid system disposed on the frame.
  • the hybrid system includes an engine 1 coupled by a planetary gear mechanism 8 , a first motor 4 and a system output shaft 12 , and a specific coupling
  • the relationship is that the engine 1 is connected to the planet carrier 8B of the planetary gear mechanism, the rotor 4A of the first motor is connected to the sun gear 8C of the planetary gear mechanism, and the system output shaft 12 is connected to the ring gear 8A of the planetary gear mechanism, in the engine 1 and the planet A torque damper 2 and a first lockup clutch 3 are disposed on the transmission path of the frame 8B, and a second lockup clutch 5 is disposed on the sun gear 8C.
  • the hybrid system further includes a second motor 11 and a shifting mechanism 9 connected to the second motor.
  • the shifting mechanism 9 includes a primary reduction gear set and a secondary reduction gear set, and the primary reduction gear set includes a primary gear and a second
  • the first stage pinion of the rotor 11A of the motor is coaxially fixed
  • the secondary reduction gear set includes a second stage pinion and a secondary large gear set coaxially with the first stage pinion
  • the second stage pinion is the same as the first stage big gear
  • the shaft is fixed and the primary pinion is coaxial with the output shaft of the system.
  • the system output shaft 12 is provided with a shifting device 10, and the shifting device is a synchronous shifter.
  • the transmission component 10A of the shifting device has a neutral position during operation, a high gear connected to the upstream of the shifting mechanism, and a downstream of the shifting mechanism.
  • the transmission member 10A is coupled to the input end 9A of the shifting mechanism in the high gear position, and the transmission member 10A is coupled to the output end 9B of the shifting mechanism in the low gear position.
  • the shifting mechanism is equivalent to being "short-circuited" by the shifting device, and the power of the second motor can be directly output to the system output shaft without deceleration, and the second motor is when the shifting device is in the low gear position. The power is decelerated and output to the output shaft of the system.
  • the hybrid system further includes a power source 9 and an integrated controller 6 coupled to the first motor and the second motor.
  • the shifting device, the first and second lockup clutches are controlled by the integrated controller.
  • the shifting mechanism may be a fixed-shaft gear transmission mechanism or a moving shaft gear train transmission mechanism, wherein the number of gear sets may be set as needed, for example, the shifting mechanism may include only one Gear reduction group or more than three gear reduction groups; the first stage pinion, the second stage big gear and the system output shaft may not be coaxial; the shifting device may also adopt a synchronizer structure, or may use a clutch, a brake, etc.
  • a shifting device of the form instead of an integrated controller, for example, the first motor, the second motor, the clutch lock and the shifting device are respectively controlled by respective controllers; when the second motor is required to enter the high speed mode When the power of the second motor is directly outputted without the speed reduction mechanism, it is only one form.
  • the speed change mechanism has the speed increasing portion, the power of the second motor can be outputted after the speed increasing portion of the speed shifting mechanism is increased.
  • the implementation of the hybrid system is as shown in FIG. 1.
  • the specific structure of the hybrid system is the same as that of the hybrid system described in the above respective vehicle embodiments, and will not be described in detail herein.
  • the hybrid power system involved in the hybrid power system control method is the same as the hybrid power system described in the above vehicle embodiment, and the specific structure thereof is no longer Detailed.
  • the specific working modes of the multi-mode hybrid hybrid system are as follows: pure electric mode, and the pure electric mode includes three working modes, namely, a first pure electric mode, a second pure electric mode, and a third pure electric mode.
  • the choice of the three modes is selected by two conditions: power requirement and efficiency.
  • the specific logic judgment is shown in Figure 2: where P demand is the vehicle demand power, P 1 is the maximum power of the first motor, and P 2 is the maximum power of the second motor, P 1 ⁇ P 2 .
  • the first pure electric mode in which the first motor and the second motor are driven together, the first lockup clutch is in a locked state, and the second lockup clutch is in a non-locked state.
  • the system can be divided into a low-speed first pure electric mode and a high-speed first pure electric mode.
  • the vehicle speed threshold is represented by V H
  • the V H is a low-speed and high-speed demarcation speed, and the speed value is the same as the vehicle type.
  • the speed of high-speed and low-speed demarcation of different models is different.
  • the V H of a bus is 35km/h. When the speed of a bus is higher than 35km/h, the bus is considered to be at a high speed; when the speed of the bus is Below 35km/h, the bus is considered to be at a low speed.
  • T out k 1 T MG1 +k 2 T MG2 , where k 1 is the ratio of the radius of the planetary gear train ring gear 8A to the radius of the sun gear 8C, and k 2 is the transmission mechanism transmission ratio, T MG1 is the first motor 4 torque, T MG2 is the second motor 11 torque, and T out is the system output shaft 12 torque, which is suitable for low speed start and drive conditions.
  • Second pure electric mode This mode is driven separately for the first motor, the second motor does not work, the first lock-up clutch 3 is in the locked state, and the second lock-up clutch 5 is in the non-locked state.
  • Second pure electric mode This mode is separately driven by the second motor, the first motor follows, the first lock-up clutch 3 is in an un-locked state, and the second lock-up clutch 5 is in an un-locked state.
  • the system can be divided into two states: low speed and high speed:
  • Hybrid mode In this mode, the engine 1 is operated, the first motor 4 generates electricity, and the second motor is in an electric state, and the power source 7 does not provide or provide power to the second motor 11 according to the vehicle demand, and the engine 1 and the second motor 11 share Drive the whole vehicle.
  • the system can be divided into two states: low speed and high speed.
  • the V lock is the critical speed of the planetary gear train at the mechanical point.
  • T out k 1 ( 1+k 1 )T E +k 2 T MG2 , where k 1 is the ratio of the radius of the planetary gear ring 8A to the radius of the sun gear 8C, k 2 is the transmission chain ratio, and T MG2 is the torque of the second motor 11 T E is the torque of the engine 1 and T out is the torque of the system output shaft 12, which is suitable for the low speed driving condition.
  • the power cycle problem of the existing planetary hybrid system can be avoided, that is, the first motor 4 is in the driving state, and the second motor 11 is in the power generating state. It is ensured that at any moment of the hybrid drive, the first motor 4 is always in a power generating state, and the second motor 11 is always in a driving state, preventing an additional electromechanical secondary conversion process and improving the efficiency of the power system.
  • Engine direct drive mode In this mode, the engine 1 is operated, the first motor 4 is not working, the second motor 11 is not working, the first lock-up clutch 3 is in the non-locked state, and the second lock-up clutch 5 is in the locked state,
  • the transmission device 10 has its transmission component 10A in a free state, that is, a neutral position, and the engine 1 provides power to drive the entire vehicle. At this time, the input engine 1 of the system outputs the output shaft 12 of the system.
  • the shifting device 10 When V ⁇ V H , the system is in a low speed state, and when the low speed braking energy is recovered, the shifting device 10 combines its transmission component 10A with the transmission chain output end 9B, at which time the input of the system is the second motor 11 and the output is the system.
  • the shifting device 10 When V>V H , the system is in a high speed state, and when the high-speed braking energy is recovered, the shifting device 10 combines its transmission component 10A with the transmission chain input end 9A, at which time the input of the system is the second motor 11 and the output is the system.
  • the output shaft 12 and the braking force of the second motor are applied to the wheels through the system output shaft 12 to realize braking energy recovery.
  • the rotational speed requirement of the second motor 11 reduces the need for the range of bearing speeds of the second motor 11 design.
  • V is the vehicle traveling speed
  • V H is the boundary speed of the system at low speed and high speed, that is, the vehicle speed threshold
  • V lock is the boundary speed of the second lock-up clutch locked in the hybrid mode
  • V Pure electric H is the highest speed limit for pure electric mode driving
  • SOC L is the lower SOC lower limit of vehicle power supply
  • P demand is the required power of the whole vehicle
  • P 1 is the maximum power of the first motor
  • P 2 is the maximum power of the second motor.
  • the first step is to determine whether it belongs to the brake energy recovery mode according to the state of the brake pedal and the accelerator pedal.
  • the brake energy recovery mode is entered, and according to Whether the vehicle speed V is greater than V H to determine whether to enter the high-speed braking energy recovery mode, when V>V H , enter the high-speed braking energy recovery mode, and enter the low-speed braking energy recovery mode when V ⁇ V H . Otherwise go to the second step.
  • a second step the vehicle power supply in accordance with the SOC value SOC is lower than the lower limit value L to determine whether the hybrid vehicle enters the low-speed mode, when the power supply SOC ⁇ SOC L, into the low-speed hybrid mode, or to the third step.
  • the fourth step is to determine whether to enter the engine direct drive mode according to whether the vehicle power demand is in the engine high efficiency zone. When the vehicle power demand is in the engine high efficiency zone, enter the engine direct drive mode, otherwise proceed to the fifth step.
  • the fifth step according to whether the vehicle speed V is greater than the V lock , it is judged whether to enter the low speed mixing mode.
  • V ⁇ V lock the low speed mixing mode is entered, otherwise the high speed mixing mode is entered.
  • whether the P demand is greater than the maximum power P 2 of the second motor determines whether to enter the first pure electric mode.
  • the P demand > P 2 the first pure electric mode, and according to whether the vehicle speed V is greater than V H to judge whether to enter the high-speed first pure electric mode, when V>V H , enter the high-speed first pure electric mode, otherwise enter the low-speed first pure electric mode.
  • the P demand ⁇ P 2 the seventh step is entered.
  • a seventh step according to whether the vehicle power demand P demand is greater than the maximum power P of the first motor. 1 determines whether to enter the eighth step, when the demand for P> P 1, the operation proceeds to step eighth P demand ⁇ P 1, the process proceeds first Nine steps.
  • the eighth step it is judged whether the first pure electric mode has the best efficiency (ie, the power is optimal), and if so, enters the first pure electric mode, and judges whether to enter the high speed first according to whether the vehicle speed V is greater than V H .
  • the first pure electric mode when V>V H , enter the high-speed first pure electric mode, otherwise enter the low-speed first pure electric mode. If the first pure electric mode power is not optimal, enter the third pure electric mode, and judge whether to enter the high-speed third pure electric mode according to whether the vehicle speed V is greater than V H , and enter the high-speed third pure electric motor when V>V H Mode, otherwise enter the low speed third pure electric mode.
  • the optimal efficiency of the integrated motor drive system refers to the highest efficiency of the integrated motor drive system compared to the electric mode. For example, whether the first pure electric mode is the best in the integrated motor drive system is the first. Compared with the second and third pure electric modes, the first electric mode, that is, the mode in which the first motor and the second motor are both operated, whether the driving efficiency of the first motor and the second motor is higher than that of the first motor Drive efficiency when working alone (second pure electric mode) and when the second motor is working alone (third pure electric mode).
  • the ninth step is to determine whether the first pure electric mode integrated motor drive system has the best efficiency. If yes, enter the first pure electric mode, and at the same time judge whether to enter the high speed first pure electric mode according to whether the vehicle speed V is greater than V H , when V >V H , enter the high-speed first pure electric mode, otherwise enter the low-speed first pure electric mode. If it is not the first pure electric mode integrated motor drive system, the efficiency is the best, go to the tenth step.
  • the second pure electric mode integrated motor drive system it is judged whether the second pure electric mode integrated motor drive system has the best efficiency, and if so, enters the second pure electric mode. If it is not the second pure electric mode integrated motor drive system, the efficiency is the best, enter the third pure electric mode, and judge whether to enter the high-speed third pure electric mode according to whether the vehicle speed V is greater than V H. When V>V H , enter the high speed. The third pure electric mode, otherwise enters the low-speed third pure electric mode.
  • the mode switching is realized by using the lock-up clutch, the shifting device and the planetary gear mechanism, thereby avoiding the problem of excessive electric power and high-speed power circulation of the existing planetary hybrid system on the market at low speed; using the second lock-up clutch
  • the problem that the existing planetary hybrid system can not directly drive the engine for a long time due to the first motor stalling in the direct drive mode of the engine is solved.
  • the engine directly drives the whole vehicle at high speed, avoids the electromechanical conversion problem of the existing hybrid system during hybrid driving, improves the efficiency of the power system, realizes the neutral gear by using the shifting mechanism, and avoids the high speed follow-up of the second motor in the direct drive mode of the high speed engine.
  • the power loss improves the overall efficiency of the power system.
  • the first lock-up clutch overcomes the shortcomings of the original planetary-row hybrid system that cannot achieve the dual-motor combined drive. In the pure electric mode, the dual-motor can simultaneously participate in the drive.
  • the first drive motor can be implemented individually by the shifting means, a second motor can be implemented without the intervention of a transmission neutral condition, the high-speed state and a low speed gear state, the second motor parameters optimized, reduced torque demand. Reduce the need for the braking force and the rotational speed of the second motor, reduce the size of the motor and the design of the bearing speed range, and solve the problem of insufficient starting ability of the ramp.
  • the pure electric mode of the hybrid system when the hybrid system does not have the first lockup clutch, has only the third pure electric mode, and in the pure electric mode, when the vehicle speed V is greater than the vehicle speed When the threshold value V H is entered, the high-speed third pure electric mode is entered. When the vehicle speed V is less than or equal to the vehicle speed threshold V H , the low-speed third pure electric mode is entered; of course, the hybrid system may also have only the first pure electric mode.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

Disclosed are a series-parallel hybrid power system, a control method therefor, and a vehicle comprising the series-parallel hybrid power system. The series-parallel hybrid power system comprises a second electric motor (11), a speed change mechanism (9) connected to the second electric motor (11), and an engine (1), a first electric motor (4) and a system output shaft (12) coupled by means of a planetary gear mechanism (8). A gear shift device (10) is arranged between the system output shaft (12) and the second electric motor (11). The gear shift device (10) can realise a gear shift in the speed change mechanism (9) during the course of action. The series-parallel hybrid power system solves the technical problem in the prior art of a single mode of pure electric operation.

Description

车辆、混联式混合动力系统及混合动力系统控制方法Vehicle, hybrid hybrid system and hybrid system control method 技术领域Technical field
本发明涉及混合动力领域中的车辆、混联式混合动力系统及混合动力系统控制方法。The present invention relates to a vehicle, a hybrid hybrid system, and a hybrid system control method in the field of hybrid power.
背景技术Background technique
混联式混合动力系统相对于串联混合动力系统和并联混合动力系统具有巨大的性能优势。现有的混联式混合动力系统如中国专利(公开号为CN105857054A、申请名称为“一种混合动力系统及使用该系统的混合动力汽车”)中公开的混合动力系统，该混合动力系统包括通过行星齿轮机构耦合传动的发动机、发电机(即第一电机)，混合动力系统还包括用于对发电机的转子进行制动的发电制动器(即锁止器)、驱动电机(即第二电机)和连接于驱动电机的转子上的变速机构，变速机构与系统输出轴相连，系统输出轴与行星齿轮机构之间设置有离合器。该混合动力系统可以实现多种控制模式，比如说纯电动模式、发动机串联发电模式、发动机行车发电模式、发动机直驱模式等，但是现有的这种混合动力系统还存在很多不足，比如说纯电动模式工况为：在车辆以低速或者小负荷行驶时，离合器分离，驱动电机通过变速机构降速增扭后驱动车轮转动，车辆以纯电驱动模式行驶，避免低速行驶时发动机由于怠速而产生的高油耗。现有混合动力系统的纯电动模式下仅有一个降速增扭模式，无论是低速还是高速状态，第二电机都要经过降速增扭后才能介入传动，不利于第二电机的能效发挥，模式过于单一，不能满足车辆行驶中的各种工况，有可能造成低速时功率过大，高速时功率循环的问题；现有技术在车辆高速行驶时，发动机直驱状态下，驱动电机必须处于高速随转状态，系统效率较低。Hybrid hybrid systems offer tremendous performance advantages over series hybrid systems and parallel hybrid systems. An existing hybrid hybrid system such as the hybrid system disclosed in Chinese Patent No. CN105857054A, entitled "Hybrid Power System and Hybrid Vehicle Using the System", the hybrid system includes The planetary gear mechanism couples the driven engine, the generator (ie, the first motor), and the hybrid system further includes a power generating brake (ie, a lock) for braking the rotor of the generator, and a driving motor (ie, the second motor) And a shifting mechanism connected to the rotor of the driving motor, the shifting mechanism is connected to the system output shaft, and a clutch is disposed between the system output shaft and the planetary gear mechanism. The hybrid system can implement a variety of control modes, such as pure electric mode, engine series power generation mode, engine driving power generation mode, engine direct drive mode, etc., but the existing hybrid system still has many deficiencies, such as pure The electric mode condition is: when the vehicle is running at low speed or small load, the clutch is disengaged, the driving motor is driven by the speed reduction mechanism to increase the torque, and the vehicle is driven to rotate, and the vehicle is driven in the pure electric driving mode to avoid the engine being idling due to the low speed running. High fuel consumption. In the pure electric mode of the existing hybrid system, there is only one mode of speed reduction and twisting. Whether it is a low speed or a high speed state, the second motor must be twisted and twisted to be able to intervene in the transmission, which is not conducive to the energy efficiency of the second motor. The mode is too single to meet the various working conditions of the vehicle, which may cause excessive power at low speed and power circulation at high speed. In the prior art, when the vehicle is driving at a high speed, the drive motor must be in the direct engine state. High-speed rotation, system efficiency is low.
发明内容Summary of the invention
本发明的目的是提供一种混联式混合动力系统控制方法，用以解决现有技术中的纯电动模式单一问题；本发明的目的还在于提供一种专用于实施上述混联式混合动力系统控制方法的混联式混合动力系统及使用该混联式混合动力系统的车辆。The object of the present invention is to provide a hybrid hybrid power system control method for solving the single problem of the pure electric mode in the prior art; and an object of the present invention is to provide a hybrid power system dedicated to implementing the above hybrid power system. A hybrid hybrid system of a control method and a vehicle using the hybrid hybrid system.
为实现上述目的，本发明中混联式混合动力系统的技术方案为：In order to achieve the above object, the technical solution of the hybrid hybrid power system of the present invention is:
混联式混合动力系统，包括第二电机、与第二电机相连的变速机构和通过行星齿轮机构耦合的发动机、第一电机和系统输出轴，系统输出轴与第二电机之间设置有换挡装置，换挡装置在动作过程中可实现变速机构的挡位切换。a hybrid hybrid system comprising a second motor, a shifting mechanism coupled to the second motor, and an engine coupled by the planetary gear mechanism, the first motor and the system output shaft, and a shift between the system output shaft and the second motor The device, the shifting device can realize the gear shifting of the shifting mechanism during the operation.
换挡装置还具有空挡位，发动机与行星齿轮机构的传动路径上设置有第一锁止离合器，第一电机与行星齿轮机构的传动路径上设置有第二锁止离合器。The shifting device also has a neutral position, and a first lock-up clutch is disposed on the transmission path of the engine and the planetary gear mechanism, and a second lock-up clutch is disposed on the transmission path of the first motor and the planetary gear mechanism.
本发明中车辆的技术方案为：The technical solution of the vehicle in the invention is:
车辆，包括车架及设置于车架上的混联式混合动力系统，混联式混合动力系统包括第二电机、与第二电机相连的变速机构和通过行星齿轮机构耦合的发动机、第一电机和系统输出轴，系统输出轴与第二电机之间设置有换挡装置，换挡装置在动作过程中可实现变速机构的挡位切换。a vehicle comprising a frame and a hybrid hybrid system disposed on the frame, the hybrid hybrid system comprising a second motor, a shifting mechanism coupled to the second motor, and an engine coupled by the planetary gear mechanism, the first motor And a system output shaft, a shifting device is arranged between the system output shaft and the second motor, and the shifting device can realize the gear shifting of the shifting mechanism during the operation.
换挡装置还具有空挡位，发动机与行星齿轮机构的传动路径上设置有第一锁止离合器，第一电机与行星齿轮机构的传动路径上设置有第二锁止离合器。The shifting device also has a neutral position, and a first lock-up clutch is disposed on the transmission path of the engine and the planetary gear mechanism, and a second lock-up clutch is disposed on the transmission path of the first motor and the planetary gear mechanism.
本发明中混合动力系统控制方法的技术方案为：The technical solution of the hybrid system control method in the present invention is:
混合动力系统控制方法，步骤如下：Hybrid system control method, the steps are as follows:
在车辆处于纯电动模式时，检测当前车速，与车速阈值比较；When the vehicle is in the pure electric mode, the current vehicle speed is detected and compared with the vehicle speed threshold;
若当前车速大于所述车速阈值，第二电机的动力经变速机构加速减扭后输出或不经过变速机构直接输出，则车辆进入高速纯电动模式；若当前车速小于所述车速阈值，第二电机的动力经过变速机构减速增扭后输出，则车辆进入低速纯电动模式。If the current vehicle speed is greater than the vehicle speed threshold, the power of the second motor is accelerated or reduced by the shifting mechanism and outputted directly or without the shifting mechanism, the vehicle enters the high-speed pure electric mode; if the current vehicle speed is less than the vehicle speed threshold, the second motor The power is output after the speed reduction mechanism is decelerated and twisted, and the vehicle enters the low speed pure electric mode.
所述纯电动模式包括第一电机与第二电机均处于电动状态的第一纯电动 模式，仅第一电机处于电动状态的第二纯电动模式，以及仅第二电机处于电动状态的第三纯电动模式；所述第一电机输出最大功率P 1小于第二电机输出最大功率P 2，P 2＞P 1； The pure electric mode includes a first pure electric mode in which the first motor and the second motor are both in an electric state, a second pure electric mode in which only the first motor is in an electric state, and a third pure in which the second motor is in an electric state only The electric mode; the first motor output maximum power P 1 is smaller than the second motor output maximum power P 2 , P 2 >P 1 ;
所述高速纯电动模式包括高速第一纯电动模式和高速第三纯电动模式；The high speed pure electric mode includes a high speed first pure electric mode and a high speed third pure electric mode;
所述低速纯电动模式包括低速第一纯电动模式和低速第三纯电动模式。The low speed pure electric mode includes a low speed first pure electric mode and a low speed third pure electric mode.
判断车辆处于所述第一纯电动模式的判据包括：The criteria for determining that the vehicle is in the first pure electric mode include:
1)P 需求≤P 1+P 2，V≤V 纯电H； 1) P demand ≤ P 1 + P 2 , V ≤ V pure electric H ;
2)P 需求＞P 2；或者：P 需求≤P 1且处于第一纯电动模式时综合电机驱动效率最佳；或者：P 1＜P 需求＜P 2，且处于第一纯电动模式时综合电机驱动效率最佳； 2) P demand > P 2 ; or: P demand ≤ P 1 and the overall motor drive efficiency is best when in the first pure electric mode; or: P 1 <P demand < P 2 and integrated in the first pure electric mode The motor drive efficiency is the best;
其中，判据1)、2)为相与的关系，P 需求为车辆需求功率；V 纯电H为纯电动模式下车辆的最高车速。 Among them, the criteria 1), 2) are the relationship, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed in the pure electric mode.
判断车辆处于所述第二纯电动模式的判据包括：The criteria for determining that the vehicle is in the second pure electric mode include:
3)P 需求≤P 1+P 2，V≤V 纯电H，P 需求≤P 1，处于第二纯电动模式时综合电机驱动系统效率最佳； 3) P demand ≤ P 1 + P 2 , V ≤ V pure electric H , P demand ≤ P 1 , in the second pure electric mode, the integrated motor drive system is the most efficient;
其中，P 需求为车辆需求功率；V 纯电H为纯电动模式下车辆的最高车速。 Among them, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed of the vehicle in the pure electric mode.
判断车辆处于所述第三纯电动模式的判据包括：The criteria for determining that the vehicle is in the third pure electric mode include:
1)P 需求≤P 1+P 2，V≤V 纯电H； 1) P demand ≤ P 1 + P 2 , V ≤ V pure electric H ;
4)P 需求≤P 1且处于第一、第二纯电动模式时功率均不是最优；或者：P 1＜P 需求＜P 2，且处于第一纯电动模式时不是综合电机驱动效率最佳； 4) P demand ≤ P 1 and power is not optimal in the first and second pure electric modes; or: P 1 <P demand < P 2 , and the first pure electric mode is not the best integrated motor drive efficiency ;
其中，判据1)、4)为相与的关系，P 需求为车辆需求功率；V 纯电H为纯电动模式下车辆的最高车速。 Among them, the criteria 1), 4) are the relationship, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed of the vehicle in the pure electric mode.
所述车辆处于纯电动模式的判据包括动力电池SOC＞SOCL，其中SOCL为纯电动模式的SOC阈值。The criterion that the vehicle is in the pure electric mode includes the power battery SOC > SOCL, where the SOCL is the SOC threshold of the pure electric mode.
本发明的有益效果为：在纯电动模式下，若当前车速小于车速阈值，换挡装置动作处于低挡位即降速增扭挡位，第二电机的动力经变速机构输出，实现 降速增扭，若当前车速大于车速阈值，换挡装置动作，换挡装置处于高挡位，第二电机的动力经变速机构增设减扭输出或不经变速机构直接输出，保证第二电机的工作效率，。The beneficial effects of the present invention are: in the pure electric mode, if the current vehicle speed is less than the vehicle speed threshold, the shifting device moves in the low gear position, that is, the speed increasing torque-increasing gear position, and the power of the second motor is output through the shifting mechanism to achieve the speed increase. Twist, if the current vehicle speed is greater than the vehicle speed threshold, the shifting device is operated, the shifting device is in the high gear position, and the power of the second motor is increased or decreased by the shifting mechanism or directly outputted without the shifting mechanism to ensure the working efficiency of the second motor. .
进一步的，在高速混合动力模式下，第二锁止离合器锁止，实现发动机直驱模式，并通过换挡装置动作使得变速机构处于空挡位，避免第二电机高速随动带来的效率损失，提高直驱效率。Further, in the high-speed hybrid mode, the second lock-up clutch is locked to realize the direct drive mode of the engine, and the shifting mechanism is operated by the shifting device to avoid the efficiency loss caused by the high-speed follow-up of the second motor. Improve the efficiency of direct drive.
附图说明DRAWINGS
图1是本发明中混联式混合动力系统的一个实施例的结构示意图；1 is a schematic structural view of an embodiment of a hybrid hybrid power system of the present invention;
图2是本发明中混合动力系统控制方法的一个实施例的控制逻辑图；2 is a control logic diagram of an embodiment of a hybrid system control method of the present invention;
图3是混合动力系统控制方法实施例中混合动力系统所能实现的工作模式与对应部件的工作状态表。3 is a working state table of an operation mode and a corresponding component that can be realized by the hybrid system in the embodiment of the hybrid system control method.
具体实施方式detailed description
车辆的实施例如图1所示：包括车架及设置于车架上的混合动力系统，混合动力系统包括通过行星齿轮机构8耦合的发动机1、第一电机4和系统输出轴12，具体的耦合关系为，发动机1与行星齿轮机构的行星架8B相连，第一电机的转子4A与行星齿轮机构的太阳轮8C相连，系统输出轴12与行星齿轮机构的齿圈8A相连，在发动机1与行星架8B的传动路径上设置有扭矩减震器2和第一锁止离合器3，在太阳轮8C上设置有第二锁止离合器5。混合动力系统还包括第二电机11和与第二电机相连的变速机构9，变速机构9包括一级减速齿轮组和二级减速齿轮组，一级减速齿轮组包括一级大齿轮和与第二电机的转子11A同轴固连的一级小齿轮，二级减速齿轮组包括二级小齿轮和与一级小齿轮同轴线设置的二级大齿轮，二级小齿轮与一级大齿轮同轴固连，同时一级小齿轮与系统输出轴同轴线设置。系统输出轴12上设置有换挡装置10，换挡装置为同步换挡器，换挡装置的传动部件10A在动作过程中具有空挡位、与变速机构上游相连的高挡位和与变速机构下游相连的低挡位，本实施例中，在高挡位时，传动部件10A连 接于变速机构的输入端9A，在低挡位时，传动部件10A连接于变速机构的输出端9B上。换挡装置在高挡位时，变速机构相当于被换挡装置“短路”，第二电机的动力可以不经过减速而直接向系统输出轴输出，换挡装置在低挡位时，第二电机的动力经过减速后向系统输出轴输出，换挡装置在空挡时，换挡装置断开第二电机与系统输出轴之间的传动。混合动力系统还包括动力电源9和与第一电机、第二电机控制连接的集成控制器6，换挡装置、第一、第二锁止离合器由集成控制器控制。The vehicle is implemented as shown in FIG. 1 : including a frame and a hybrid system disposed on the frame. The hybrid system includes an engine 1 coupled by a planetary gear mechanism 8 , a first motor 4 and a system output shaft 12 , and a specific coupling The relationship is that the engine 1 is connected to the planet carrier 8B of the planetary gear mechanism, the rotor 4A of the first motor is connected to the sun gear 8C of the planetary gear mechanism, and the system output shaft 12 is connected to the ring gear 8A of the planetary gear mechanism, in the engine 1 and the planet A torque damper 2 and a first lockup clutch 3 are disposed on the transmission path of the frame 8B, and a second lockup clutch 5 is disposed on the sun gear 8C. The hybrid system further includes a second motor 11 and a shifting mechanism 9 connected to the second motor. The shifting mechanism 9 includes a primary reduction gear set and a secondary reduction gear set, and the primary reduction gear set includes a primary gear and a second The first stage pinion of the rotor 11A of the motor is coaxially fixed, and the secondary reduction gear set includes a second stage pinion and a secondary large gear set coaxially with the first stage pinion, and the second stage pinion is the same as the first stage big gear The shaft is fixed and the primary pinion is coaxial with the output shaft of the system. The system output shaft 12 is provided with a shifting device 10, and the shifting device is a synchronous shifter. The transmission component 10A of the shifting device has a neutral position during operation, a high gear connected to the upstream of the shifting mechanism, and a downstream of the shifting mechanism. In the connected low gear, in the present embodiment, the transmission member 10A is coupled to the input end 9A of the shifting mechanism in the high gear position, and the transmission member 10A is coupled to the output end 9B of the shifting mechanism in the low gear position. When the shifting device is in the high gear position, the shifting mechanism is equivalent to being "short-circuited" by the shifting device, and the power of the second motor can be directly output to the system output shaft without deceleration, and the second motor is when the shifting device is in the low gear position. The power is decelerated and output to the output shaft of the system. When the shifting device is in neutral, the shifting device disconnects the transmission between the second motor and the output shaft of the system. The hybrid system further includes a power source 9 and an integrated controller 6 coupled to the first motor and the second motor. The shifting device, the first and second lockup clutches are controlled by the integrated controller.
本车辆实施例中混合动力系统的可实现工作模式及相应控制方法请见混合动力系统控制方法的实施例，在此不再详述。在本发明的其它实施例中，变速机构可以是定轴式齿轮传动机构，也可以是动轴轮系传动机构，其中齿轮组的个数可以根据需要进行设置，比如说变速机构可以仅包括一个齿轮减速组或三个以上的齿轮减速组；一级小齿轮、二级大齿轮与系统输出轴也可以不是同轴关系；换挡装置还可以采用同步器结构，或者可以采用离合器、制动器等其他形式的换挡装置；也可以不采用集成式控制器，比如说第一电机、第二电机、离合锁止器和换挡装置分别由各自对应的控制器控制；在需要第二电机进入高速模式时，第二电机的动力不经减速机构直接输出只是一种形式，当变速机构具有增速部分，第二电机的动力可以经变速机构的增速部分增速后输出。For the achievable working mode and the corresponding control method of the hybrid system in the embodiment of the present vehicle, please refer to the embodiment of the hybrid power system control method, which will not be described in detail herein. In other embodiments of the present invention, the shifting mechanism may be a fixed-shaft gear transmission mechanism or a moving shaft gear train transmission mechanism, wherein the number of gear sets may be set as needed, for example, the shifting mechanism may include only one Gear reduction group or more than three gear reduction groups; the first stage pinion, the second stage big gear and the system output shaft may not be coaxial; the shifting device may also adopt a synchronizer structure, or may use a clutch, a brake, etc. a shifting device of the form; instead of an integrated controller, for example, the first motor, the second motor, the clutch lock and the shifting device are respectively controlled by respective controllers; when the second motor is required to enter the high speed mode When the power of the second motor is directly outputted without the speed reduction mechanism, it is only one form. When the speed change mechanism has the speed increasing portion, the power of the second motor can be outputted after the speed increasing portion of the speed shifting mechanism is increased.
混合动力系统的实施例如图1所示：混合动力系统的具体结构与上述各车辆实施例中所述的混合动力系统相同，在此不再详述。The implementation of the hybrid system is as shown in FIG. 1. The specific structure of the hybrid system is the same as that of the hybrid system described in the above respective vehicle embodiments, and will not be described in detail herein.
混合动力系统控制方法的实施例如图1～3所示：该混合动力系统控制方法中涉及到的混合动力系统与上述车辆实施例中所述的混合动力系统相同，在此对其具体结构不再详述。The implementation of the hybrid power system control method is as shown in FIGS. 1 to 3: the hybrid power system involved in the hybrid power system control method is the same as the hybrid power system described in the above vehicle embodiment, and the specific structure thereof is no longer Detailed.
该多模混联式混合动力系统的具体工作模式有以下几种：纯电动模式，纯电动模式包括三种工作模式，即第一纯电动模式、第二纯电动模式和第三纯电动模式，三种模式的选择通过功率要求以及效率最优两个条件进行选择。具体 的逻辑判断如图2所示：其中P 需求为车辆需求功率，P 1为第一电机的最大功率，P 2为第二电机的最大功率，P 1＜P 2。 The specific working modes of the multi-mode hybrid hybrid system are as follows: pure electric mode, and the pure electric mode includes three working modes, namely, a first pure electric mode, a second pure electric mode, and a third pure electric mode. The choice of the three modes is selected by two conditions: power requirement and efficiency. The specific logic judgment is shown in Figure 2: where P demand is the vehicle demand power, P 1 is the maximum power of the first motor, and P 2 is the maximum power of the second motor, P 1 <P 2 .
第一纯电动模式，此模式下第一电机、第二电机共同驱动，第一锁止离合器处于锁死状态，第二锁止离合器处于非锁死状态。此时系统根据车速V是否大于车速阈值又可以分为低速第一纯电动模式和高速第一纯电动模式，车速阈值用V H表示，V H为低速和高速的分界速度，该速度值跟车型有关，不同车型的高速、低速分界速度是不同的，比如说公交车的V H为35km/h，当公交车的车速高于35km/h时，认为公交车处于高速状态；当公交车的车速低于35km/h时，认为公交车处于低速状态。 The first pure electric mode, in which the first motor and the second motor are driven together, the first lockup clutch is in a locked state, and the second lockup clutch is in a non-locked state. At this time, according to whether the vehicle speed V is greater than the vehicle speed threshold, the system can be divided into a low-speed first pure electric mode and a high-speed first pure electric mode. The vehicle speed threshold is represented by V H , and the V H is a low-speed and high-speed demarcation speed, and the speed value is the same as the vehicle type. Regarding, the speed of high-speed and low-speed demarcation of different models is different. For example, the V H of a bus is 35km/h. When the speed of a bus is higher than 35km/h, the bus is considered to be at a high speed; when the speed of the bus is Below 35km/h, the bus is considered to be at a low speed.
当V≤V H时，系统处于低速状态，换挡装置10的传动部件与变速机构的输出端9B结合，此时系统的输入为第一电机4和第二电机11，系统输出轴12为输出轴，具体的转矩关系为：T out＝k 1T MG1+k 2T MG2，其中k 1为行星齿轮系齿圈8A半径与太阳轮8C半径的比值，k 2为变速机构传动比，T MG1为第一电机4转矩，T MG2为第二电机11转矩，T out为系统输出轴12转矩，适合于低速起步及驱动工况。 When V ≤ V H , the system is in a low speed state, and the transmission component of the shifting device 10 is combined with the output end 9B of the shifting mechanism. At this time, the input of the system is the first motor 4 and the second motor 11, and the output shaft 12 of the system is the output. The specific torque relationship of the shaft is: T out =k 1 T MG1 +k 2 T MG2 , where k 1 is the ratio of the radius of the planetary gear train ring gear 8A to the radius of the sun gear 8C, and k 2 is the transmission mechanism transmission ratio, T MG1 is the first motor 4 torque, T MG2 is the second motor 11 torque, and T out is the system output shaft 12 torque, which is suitable for low speed start and drive conditions.
当V＞V H时，系统处于高速状态，换挡装置10与变速机构的输入端9A结合，此时系统的输入为第一电机4和第二电机11，输出为系统输出轴12，具体的转矩关系为：T out＝k 1T MG1+T MG2，适合于高速巡航及驱动工况。 When V>V H , the system is in a high speed state, and the shifting device 10 is combined with the input end 9A of the shifting mechanism. At this time, the input of the system is the first motor 4 and the second motor 11, and the output is the system output shaft 12, specifically The torque relationship is: T out =k 1 T MG1 +T MG2 , suitable for high speed cruising and driving conditions.
第二纯电动模式：此模式为第一电机单独驱动，第二电机不工作，第一锁止离合器3处于锁死状态，第二锁止离合器5处于非锁死状态。换挡装置10将其传动部件10A处于自由状态，即空挡状态，此时系统的输入为第一电机4，输出为系统输出轴12具体的转矩关系为：T out＝k 1T MG1。 Second pure electric mode: This mode is driven separately for the first motor, the second motor does not work, the first lock-up clutch 3 is in the locked state, and the second lock-up clutch 5 is in the non-locked state. The shifting device 10 has its transmission component 10A in a free state, that is, a neutral state. At this time, the input of the system is the first motor 4, and the output is the system output shaft 12, and the specific torque relationship is: T out = k 1 T MG1 .
第三纯电动模式：此模式为第二电机单独驱动，第一电机随动，第一锁止离合器3处于非锁死状态，第二锁止离合器5处于非锁死状态。此时系统又可以 分为低速和高速两种状态：Third pure electric mode: This mode is separately driven by the second motor, the first motor follows, the first lock-up clutch 3 is in an un-locked state, and the second lock-up clutch 5 is in an un-locked state. At this point, the system can be divided into two states: low speed and high speed:
当V≤V H时，系统处于低速状态，换挡装置10将其传动部件10A与变速机构输出端9B结合，此时系统的输入为第二电机11，输出为系统输出轴12，具体的转矩关系为：T out＝k 2T MG2，其中k 2为变速机构传动比，适合于低速起步及驱动工况。 When V ≤ V H , the system is in a low speed state, and the shifting device 10 combines its transmission component 10A with the shifting mechanism output end 9B. At this time, the input of the system is the second motor 11 and the output is the system output shaft 12, and the specific rotation The moment relationship is: T out = k 2 T MG2 , where k 2 is the transmission mechanism transmission ratio, suitable for low speed starting and driving conditions.
当V＞V H时，系统处于高速状态，换挡装置10将其传动部件10A与变速机构输入端9A结合，此时系统的输入为第二电机11，输出为系统输出轴12，速比为1，具体的转矩关系为：T out＝T MG2，适合于高速巡航及驱动工况。 When V>V H , the system is in a high speed state, and the shifting device 10 combines its transmission component 10A with the shifting mechanism input end 9A. At this time, the input of the system is the second motor 11 and the output is the system output shaft 12, and the speed ratio is 1, the specific torque relationship is: T out = T MG2 , suitable for high-speed cruising and driving conditions.
混动模式：此模式下发动机1工作，第一电机4发电，第二电机处于电动状态，动力电源7依据整车需求向第二电机11不提供或提供动力，发动机1与第二电机11共同驱动整车行驶，此时系统根据车速V是否大于V 锁又可以分为低速和高速两种状态，V 锁为行星齿轮系处于机械点的临界速度。 Hybrid mode: In this mode, the engine 1 is operated, the first motor 4 generates electricity, and the second motor is in an electric state, and the power source 7 does not provide or provide power to the second motor 11 according to the vehicle demand, and the engine 1 and the second motor 11 share Drive the whole vehicle. At this time, according to whether the vehicle speed V is greater than the V lock , the system can be divided into two states: low speed and high speed. The V lock is the critical speed of the planetary gear train at the mechanical point.
当V≤V 锁时，系统处于低速状态，第一锁止离合器3处于非锁死状态，第二锁止离合器5处于非锁死状态。换挡装置10将其传动部件10A与传动链输出端9B结合，此时系统的输入发动机1和第二电机11，输出为系统输出轴12，具体的转矩关系为：T out＝k 1(1+k 1)T E+k 2T MG2，其中k 1为行星齿轮系齿圈8A半径与太阳轮8C半径的比值，k 2为传动链传动比，T MG2为第二电机11转矩，T E为发动机1转矩，T out为系统输出轴12转矩，适合于低速驱动工况。 When V ≤ V lock , the system is in a low speed state, the first lock-up clutch 3 is in an un-locked state, and the second lock-up clutch 5 is in an un-locked state. The shifting device 10 combines its transmission component 10A with the transmission chain output end 9B. At this time, the input engine 1 and the second motor 11 of the system output the system output shaft 12, and the specific torque relationship is: T out = k 1 ( 1+k 1 )T E +k 2 T MG2 , where k 1 is the ratio of the radius of the planetary gear ring 8A to the radius of the sun gear 8C, k 2 is the transmission chain ratio, and T MG2 is the torque of the second motor 11 T E is the torque of the engine 1 and T out is the torque of the system output shaft 12, which is suitable for the low speed driving condition.
当V＞V 锁时，系统处于高速状态，第一锁止离合器3处于非锁死状态，第二锁止离合器5处于锁死状态。换挡装置10将其传动部件10A与传动链输入端9A结合，此时系统的输入发动机1和第二电机11，输出为系统输出轴12，具体的转 矩关系为：T out＝k 1(1+k 1)T E+T MG2，适合于高速驱动工况。 When V>V lock , the system is in a high speed state, the first lockup clutch 3 is in a non-locked state, and the second lockup clutch 5 is in a locked state. The shifting device 10 combines its transmission component 10A with the drive chain input end 9A. At this time, the input engine 1 and the second motor 11 of the system output as the system output shaft 12, and the specific torque relationship is: T out = k 1 ( 1+k 1 )T E +T MG2 , suitable for high speed drive conditions.
依据行星混联系统的机械点，通过运用第二锁止离合器5与换挡装置10进行低速与高速混合驱动的模式切换，可以避免现有行星混联系统的功率循环问题，即：第一电机4处于驱动状态，第二电机11处于发电状态。保证在混合驱动的任何时刻，第一电机4永远处于发电状态，第二电机11永远处于驱动状态，防止额外的机电二次转换过程，提高动力系统效率。According to the mechanical point of the planetary hybrid system, by using the second lock-up clutch 5 and the shifting device 10 to perform mode switching of the low-speed and high-speed hybrid drive, the power cycle problem of the existing planetary hybrid system can be avoided, that is, the first motor 4 is in the driving state, and the second motor 11 is in the power generating state. It is ensured that at any moment of the hybrid drive, the first motor 4 is always in a power generating state, and the second motor 11 is always in a driving state, preventing an additional electromechanical secondary conversion process and improving the efficiency of the power system.
发动机直驱模式：此模式下发动机1工作，第一电机4不工作，第二电机11不工作，第一锁止离合器3处于非锁死状态，第二锁止离合器5处于锁死状态，换挡装置10将其传动部件10A处于自由状态，即空挡位，发动机1提供动力驱动整车行驶，此时系统的输入发动机1，输出为系统输出轴12，具体的转矩关系为：T out＝k 1(1+k 1)T E，适合于车辆以高速行驶，且整车功率需求位于发动机高效区的驱动工况，避免了现有混联系统在发动机直驱时存在的机电转换问题，提高动力系统的效率，同时高速时，变速机构处于空挡位置，可以避免第二电机高速随动的效率损失，提升系统效率。 Engine direct drive mode: In this mode, the engine 1 is operated, the first motor 4 is not working, the second motor 11 is not working, the first lock-up clutch 3 is in the non-locked state, and the second lock-up clutch 5 is in the locked state, The transmission device 10 has its transmission component 10A in a free state, that is, a neutral position, and the engine 1 provides power to drive the entire vehicle. At this time, the input engine 1 of the system outputs the output shaft 12 of the system. The specific torque relationship is: T out = k 1 (1+k 1 )T E is suitable for the vehicle to drive at high speed, and the power demand of the whole vehicle is located in the driving condition of the high-efficiency area of the engine, which avoids the electromechanical conversion problem existing in the direct drive of the existing hybrid system. Improve the efficiency of the power system, and at high speed, the shifting mechanism is in the neutral position, which can avoid the efficiency loss of the second motor at high speed and improve the system efficiency.
制动能量回收模式：此模式下发动机1不工作，第一电机4空转，第二电机11处于发电状态，提供整车制动力矩，第一锁止离合器3处于非锁死状态，第二锁止离合器5处于非锁死状态，此时系统又可以分为低速和高速两种状态：Brake energy recovery mode: In this mode, the engine 1 is not working, the first motor 4 is idling, the second motor 11 is in a power generation state, and the vehicle braking torque is provided, the first lockup clutch 3 is in a non-locking state, and the second lock is The clutch 5 is in a non-locked state, and the system can be divided into two states: low speed and high speed:
当V≤V H时，系统处于低速状态，低速制动能量回收时，换挡装置10将其传动部件10A与传动链输出端9B结合，此时系统的输入为第二电机11，输出为系统输出轴12，第二电机的制动力通过系统输出轴12作用到车轮上，实现制动能量回收，具体的转矩关系为：T out＝k 2T MG2，适合于低速大转矩制动，可有效利用第二电机11的制动能力，充分回收制动能量。 When V≤V H , the system is in a low speed state, and when the low speed braking energy is recovered, the shifting device 10 combines its transmission component 10A with the transmission chain output end 9B, at which time the input of the system is the second motor 11 and the output is the system. The output shaft 12, the braking force of the second motor acts on the wheel through the system output shaft 12 to realize braking energy recovery, and the specific torque relationship is: T out = k 2 T MG2 , suitable for low speed and large torque braking, The braking ability of the second motor 11 can be effectively utilized, and the braking energy can be sufficiently recovered.
当V＞V H时，系统处于高速状态，高速制动能量回收时，换挡装置10将其传动部件10A与传动链输入端9A结合，此时系统的输入为第二电机11，输出为系 统输出轴12，第二电机的制动力通过系统输出轴12作用到车轮上，实现制动能量回收，具体的转矩关系为：T out＝T MG2，适合于高速制动，可降低高速时对第二电机11的转速需求，降低第二电机11设计上对轴承转速范围的需求。 When V>V H , the system is in a high speed state, and when the high-speed braking energy is recovered, the shifting device 10 combines its transmission component 10A with the transmission chain input end 9A, at which time the input of the system is the second motor 11 and the output is the system. The output shaft 12 and the braking force of the second motor are applied to the wheels through the system output shaft 12 to realize braking energy recovery. The specific torque relationship is: T out = T MG2 , which is suitable for high-speed braking and can reduce the speed at high speed. The rotational speed requirement of the second motor 11 reduces the need for the range of bearing speeds of the second motor 11 design.
上述各种工作模式可参照附图3。The various modes of operation described above can be seen in Figure 3.
上述多模行星混联式混合动力系统的具体控制方法为：The specific control method of the above multimode planetary hybrid hybrid system is as follows:
如图2所示，其中，V是车辆行驶速度，V H为分别系统处于低速和高速的分界速度即车速阈值，V 锁止为混动模式下第二锁止离合器锁止的分界速度，V 纯电H为纯电模式行驶的最高速度限制，SOC L为车辆动力电源低SOC下限值，P 需求为整车需求功率，P 1为第一电机最大功率，P 2为第二电机最大功率。 As shown in FIG. 2, where V is the vehicle traveling speed, V H is the boundary speed of the system at low speed and high speed, that is, the vehicle speed threshold, and V lock is the boundary speed of the second lock-up clutch locked in the hybrid mode, V Pure electric H is the highest speed limit for pure electric mode driving, SOC L is the lower SOC lower limit of vehicle power supply, P demand is the required power of the whole vehicle, P 1 is the maximum power of the first motor, and P 2 is the maximum power of the second motor. .
第一步，根据制动踏板和油门踏板的状态来判定是否属于制动能量回收模式，当制动踏板被踩下，或者油门踏板未被踩下的时候，进入制动能量回收模式，同时根据车速V是否大于V H来判断是否进入高速制动能量回收模式，当V＞V H时，进入高速制动能量回收模式，当V≤V H时进入低速制动能量回收模式。否则进入第二步。 The first step is to determine whether it belongs to the brake energy recovery mode according to the state of the brake pedal and the accelerator pedal. When the brake pedal is depressed or the accelerator pedal is not depressed, the brake energy recovery mode is entered, and according to Whether the vehicle speed V is greater than V H to determine whether to enter the high-speed braking energy recovery mode, when V>V H , enter the high-speed braking energy recovery mode, and enter the low-speed braking energy recovery mode when V≤V H . Otherwise go to the second step.
第二步，根据整车动力电源SOC值是否低于下限值SOC L来判断车辆是否进入低速混动模式，当动力电源SOC≤SOC L时，进入低速混动模式，否则进入第三步。 A second step, the vehicle power supply in accordance with the SOC value SOC is lower than the lower limit value L to determine whether the hybrid vehicle enters the low-speed mode, when the power supply SOC≤SOC L, into the low-speed hybrid mode, or to the third step.
第三步，根据整车功率需求P 需求是否大于双电机最大功率P 1+P 2和车速V是否小于V 纯电H来判定是否进入纯电模式，当P 需求≤P 1+P 2，且V≤V 纯电H时，进入第六步，否则进入第四步。 The third step, according to whether the vehicle power demand P demand is greater than double the maximum motor power P 1 + P 2 and the vehicle speed V is less than V H to determine whether the electric-power mode into pure, when P demand ≤P 1 + P 2, and When V≤V pure electric H , enter the sixth step, otherwise enter the fourth step.
第四步，根据整车功率需求是否在发动机高效区，来判断是否进入发动机直驱模式，当整车功率需求在发动机高效区时，进入发动机直驱模式，否则进 入第五步。The fourth step is to determine whether to enter the engine direct drive mode according to whether the vehicle power demand is in the engine high efficiency zone. When the vehicle power demand is in the engine high efficiency zone, enter the engine direct drive mode, otherwise proceed to the fifth step.
第五步，根据车速V是否大于V 锁来判断是否进入低速混动模式，当V≤V 锁时，进入低速混动模式，否则进入高速混动模式。 In the fifth step, according to whether the vehicle speed V is greater than the V lock , it is judged whether to enter the low speed mixing mode. When V≤V lock , the low speed mixing mode is entered, otherwise the high speed mixing mode is entered.
第六步，根据整车功率需求P 需求是否大于第二电机最大功率P 2来判断是否进入第一纯电动模式，当P 需求＞P 2时，第一纯电动模式，同时根据车速V是否大于V H来判断是否进入高速第一纯电动模式，当V＞V H时，进入高速第一纯电动模式，否则进入低速第一纯电动模式。当P 需求≤P 2时，进入第七步。 In the sixth step, whether the P demand is greater than the maximum power P 2 of the second motor determines whether to enter the first pure electric mode. When the P demand > P 2 , the first pure electric mode, and according to whether the vehicle speed V is greater than V H to judge whether to enter the high-speed first pure electric mode, when V>V H , enter the high-speed first pure electric mode, otherwise enter the low-speed first pure electric mode. When the P demand ≤ P 2 , the seventh step is entered.
第七步，根据整车功率需求P 需求是否大于第一电机最大功率P 1来判断是否进入第八步，当P 需求＞P 1时，进入第八步，P 需求≤P 1时，进入第九步。 A seventh step, according to whether the vehicle power demand P demand is greater than the maximum power P of the first motor. 1 determines whether to enter the eighth step, when the demand for P> P 1, the operation proceeds to step eighth P demand ≤P 1, the process proceeds first Nine steps.
第八步，判断第一纯电动模式是否综合电机驱动系统效率最佳(即功率最优)，如果是，进入第一纯电动模式，同时根据车速V是否大于V H来判断是否进入高速第一纯电动模式，当V＞V H时，进入高速第一纯电动模式，否则进入低速第一纯电动模式。如果第一纯电动模式功率不是最优则进入第三纯电动模式，同时根据车速V是否大于V H来判断是否进入高速第三纯电动模式，当V＞V H时，进入高速第三纯电动模式，否则进入低速第三纯电动模式。综合电机驱动系统效率最佳是指该工况下，各电动模式相比，综合电机驱动系统效率最高电动模式，比如说判断第一纯电动模式是否综合电机驱动系统效率最佳，是指第一纯电动模式与第二、第三纯电动模式相比，第一纯电动模式即第一电机、第二电机均工作的模式下，第一电机、第二电机的驱动效率是否高于第一电机单独工作(第二纯电动模式)、第二电机单独工作(第三纯电动模式)时的驱动效率。 In the eighth step, it is judged whether the first pure electric mode has the best efficiency (ie, the power is optimal), and if so, enters the first pure electric mode, and judges whether to enter the high speed first according to whether the vehicle speed V is greater than V H . In pure electric mode, when V>V H , enter the high-speed first pure electric mode, otherwise enter the low-speed first pure electric mode. If the first pure electric mode power is not optimal, enter the third pure electric mode, and judge whether to enter the high-speed third pure electric mode according to whether the vehicle speed V is greater than V H , and enter the high-speed third pure electric motor when V>V H Mode, otherwise enter the low speed third pure electric mode. The optimal efficiency of the integrated motor drive system refers to the highest efficiency of the integrated motor drive system compared to the electric mode. For example, whether the first pure electric mode is the best in the integrated motor drive system is the first. Compared with the second and third pure electric modes, the first electric mode, that is, the mode in which the first motor and the second motor are both operated, whether the driving efficiency of the first motor and the second motor is higher than that of the first motor Drive efficiency when working alone (second pure electric mode) and when the second motor is working alone (third pure electric mode).
第九步，判断是否第一纯电动模式综合电机驱动系统效率最佳，如果是，进入第一纯电动模式，同时根据车速V是否大于V H来判断是否进入高速第一纯电动模式，当V＞V H时，进入高速第一纯电动模式，否则进入低速第一纯电动模 式。如果不是第一纯电动模式综合电机驱动系统效率最佳，进入第十步。 The ninth step is to determine whether the first pure electric mode integrated motor drive system has the best efficiency. If yes, enter the first pure electric mode, and at the same time judge whether to enter the high speed first pure electric mode according to whether the vehicle speed V is greater than V H , when V >V H , enter the high-speed first pure electric mode, otherwise enter the low-speed first pure electric mode. If it is not the first pure electric mode integrated motor drive system, the efficiency is the best, go to the tenth step.
第十步，判断是否第二纯电动模式综合电机驱动系统效率最佳，如果是，进入第二纯电动模式。如果不是第二纯电动模式综合电机驱动系统效率最佳，进入第三纯电动模式，同时根据车速V是否大于V H来判断是否进入高速第三纯电动模式，当V＞V H时，进入高速第三纯电动模式，否则进入低速第三纯电动模式。 In the tenth step, it is judged whether the second pure electric mode integrated motor drive system has the best efficiency, and if so, enters the second pure electric mode. If it is not the second pure electric mode integrated motor drive system, the efficiency is the best, enter the third pure electric mode, and judge whether to enter the high-speed third pure electric mode according to whether the vehicle speed V is greater than V H. When V>V H , enter the high speed. The third pure electric mode, otherwise enters the low-speed third pure electric mode.
本发明中利用锁止离合器、换挡装置和行星齿轮机构实现模式切换，避免了市场上现有行星混联系统在低速时的电功率过大及高速时的功率循环问题；利用第二锁止离合器，解决了现有行星混联系统在发动机直驱模式时因第一电机堵转而无法长时间发动机直接驱动的问题，在车辆以较高车速行驶且整车驱动力需求位于发动机高效区时，发动机高速直接驱动整车，避免现有混联系统在混合驱动时存在的机电转换问题，提高了动力系统效率；利用变速机构实现空挡，避免了高速发动机直驱模式下的第二电机高速随动的功率损失，提高了动力系统的综合效率，利用第一锁止离合器，克服了原有行星排混联系统无法实现双电机联合驱动的缺点，在纯电动模式下加速时可以双电机同时参与驱动，提高系统加速能力，避免了功率上的浪费；利用第一锁止离合器，可以实现第一电机单独驱动，利用换挡装置，可以实现第二电机不介入传动的空挡状态、高速挡状态和低速挡状态，优化第二电机参数，减小转矩需求。降低对第二电机的制动力及转速的需求，减小电机尺寸及设计上对轴承转速范围的需求，同时解决了坡道起步能力不足的问题。In the invention, the mode switching is realized by using the lock-up clutch, the shifting device and the planetary gear mechanism, thereby avoiding the problem of excessive electric power and high-speed power circulation of the existing planetary hybrid system on the market at low speed; using the second lock-up clutch The problem that the existing planetary hybrid system can not directly drive the engine for a long time due to the first motor stalling in the direct drive mode of the engine is solved. When the vehicle is driven at a higher speed and the driving force demand of the vehicle is located in the engine high efficiency region, The engine directly drives the whole vehicle at high speed, avoids the electromechanical conversion problem of the existing hybrid system during hybrid driving, improves the efficiency of the power system, realizes the neutral gear by using the shifting mechanism, and avoids the high speed follow-up of the second motor in the direct drive mode of the high speed engine. The power loss improves the overall efficiency of the power system. The first lock-up clutch overcomes the shortcomings of the original planetary-row hybrid system that cannot achieve the dual-motor combined drive. In the pure electric mode, the dual-motor can simultaneously participate in the drive. , improve system acceleration, avoid waste of power; use the first lock-up clutch The first drive motor can be implemented individually by the shifting means, a second motor can be implemented without the intervention of a transmission neutral condition, the high-speed state and a low speed gear state, the second motor parameters optimized, reduced torque demand. Reduce the need for the braking force and the rotational speed of the second motor, reduce the size of the motor and the design of the bearing speed range, and solve the problem of insufficient starting ability of the ramp.
在本发明的其它实施例中：当混合动力系统不具有第一锁止离合器时，混合动力系统的纯电动模式仅具有第三纯电动模式，此时在纯电动模式下，当车速V大于车速阈值V H时，进入高速第三纯电动模式，当车速V小于等于车速阈值V H时，进入低速第三纯电动模式；当然混合动力系统也可以仅具有第一纯电动模式。 In other embodiments of the present invention, when the hybrid system does not have the first lockup clutch, the pure electric mode of the hybrid system has only the third pure electric mode, and in the pure electric mode, when the vehicle speed V is greater than the vehicle speed When the threshold value V H is entered, the high-speed third pure electric mode is entered. When the vehicle speed V is less than or equal to the vehicle speed threshold V H , the low-speed third pure electric mode is entered; of course, the hybrid system may also have only the first pure electric mode.

Claims (10)

  1. 混联式混合动力系统，包括第二电机、与第二电机相连的变速机构和通过行星齿轮机构耦合的发动机、第一电机和系统输出轴，其特征在于：系统输出轴与第二电机之间设置有换挡装置，换挡装置在动作过程中可实现变速机构的挡位切换。A hybrid hybrid system comprising a second electric machine, a shifting mechanism coupled to the second electric machine, and an engine coupled by the planetary gear mechanism, the first electric machine and the system output shaft, characterized by: between the system output shaft and the second electric machine A shifting device is provided, and the shifting device can realize the gear shifting of the shifting mechanism during the operation.
  2. 根据权利要求1所述的混联式混合动力系统，其特征在于：换挡装置还具有空挡位，发动机与行星齿轮机构的传动路径上设置有第一锁止离合器，第一电机与行星齿轮机构的传动路径上设置有第二锁止离合器。The hybrid hybrid power system according to claim 1, wherein the shifting device further has a neutral position, and the first lockup clutch is disposed on the transmission path of the engine and the planetary gear mechanism, and the first motor and the planetary gear mechanism are provided. A second lockup clutch is disposed on the transmission path.
  3. 车辆，包括车架及设置于车架上的混联式混合动力系统，混联式混合动力系统包括第二电机、与第二电机相连的变速机构和通过行星齿轮机构耦合的发动机、第一电机和系统输出轴，其特征在于：系统输出轴与第二电机之间设置有换挡装置，换挡装置在动作过程中可实现变速机构的挡位切换。a vehicle comprising a frame and a hybrid hybrid system disposed on the frame, the hybrid hybrid system comprising a second motor, a shifting mechanism coupled to the second motor, and an engine coupled by the planetary gear mechanism, the first motor And a system output shaft, characterized in that: a shifting device is arranged between the system output shaft and the second motor, and the shifting device can realize the gear shifting of the shifting mechanism during the action.
  4. 根据权利要求3所述的车辆，其特征在于：换挡装置还具有空挡位，发动机与行星齿轮机构的传动路径上设置有第一锁止离合器，第一电机与行星齿轮机构的传动路径上设置有第二锁止离合器。The vehicle according to claim 3, wherein the shifting device further has a neutral position, and the first lockup clutch is disposed on the transmission path of the engine and the planetary gear mechanism, and the first motor and the planetary gear mechanism are disposed on the transmission path. There is a second lockup clutch.
  5. 实施上述权利要求1所述的混联式混合动力系统的混合动力系统控制方法，其特征在于，步骤如下：A hybrid system control method for implementing a hybrid hybrid power system according to claim 1 wherein the steps are as follows:
    在车辆处于纯电动模式时，检测当前车速，与车速阈值比较；When the vehicle is in the pure electric mode, the current vehicle speed is detected and compared with the vehicle speed threshold;
    若当前车速大于所述车速阈值，第二电机的动力经变速机构加速减扭后输出或不经过变速机构直接输出，则车辆进入高速纯电动模式；若当前车速小于所述车速阈值，第二电机的动力经过变速机构减速增扭后输出，则车辆进入低速纯电动模式。If the current vehicle speed is greater than the vehicle speed threshold, the power of the second motor is accelerated or reduced by the shifting mechanism and outputted directly or without the shifting mechanism, the vehicle enters the high-speed pure electric mode; if the current vehicle speed is less than the vehicle speed threshold, the second motor The power is output after the speed reduction mechanism is decelerated and twisted, and the vehicle enters the low speed pure electric mode.
  6. 根据权利要求5所述的混合动力系统控制方法，其特征在于，所述纯电动模式包括第一电机与第二电机均处于电动状态的第一纯电动模式，仅第一电 机处于电动状态的第二纯电动模式，以及仅第二电机处于电动状态的第三纯电动模式；所述第一电机输出最大功率P 1小于第二电机输出最大功率P 2，P 2＞P 1； The hybrid system control method according to claim 5, wherein the pure electric mode comprises a first pure electric mode in which both the first motor and the second motor are in an electric state, and only the first motor is in an electric state a second pure electric mode, and a third pure electric mode in which only the second motor is in an electric state; the first motor output maximum power P 1 is smaller than the second motor output maximum power P 2 , P 2 >P 1 ;
    所述高速纯电动模式包括高速第一纯电动模式和高速第三纯电动模式；The high speed pure electric mode includes a high speed first pure electric mode and a high speed third pure electric mode;
    所述低速纯电动模式包括低速第一纯电动模式和低速第三纯电动模式。The low speed pure electric mode includes a low speed first pure electric mode and a low speed third pure electric mode.
  7. 根据权利要求6所述的混合动力系统控制方法，其特征在于，判断车辆处于所述第一纯电动模式的判据包括：The hybrid system control method according to claim 6, wherein the criterion for determining that the vehicle is in the first pure electric mode comprises:
    1)P 需求≤P 1+P 2，V≤V 纯电H； 1) P demand ≤ P 1 + P 2 , V ≤ V pure electric H ;
    2)P 需求＞P 2；或者：P 需求≤P 1且处于第一纯电动模式时综合电机驱动效率最佳；或者：P 1＜P 需求＜P 2，且处于第一纯电动模式时综合电机驱动效率最佳； 2) P demand > P 2 ; or: P demand ≤ P 1 and the overall motor drive efficiency is best when in the first pure electric mode; or: P 1 <P demand < P 2 and integrated in the first pure electric mode The motor drive efficiency is the best;
    其中，判据1)、2)为相与的关系，P 需求为车辆需求功率；V 纯电H为纯电动模式下车辆的最高车速。 Among them, the criteria 1), 2) are the relationship, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed in the pure electric mode.
  8. 根据权利要求6所述的混合动力系统控制方法，其特征在于，判断车辆处于所述第二纯电动模式的判据包括：The hybrid system control method according to claim 6, wherein the criterion for determining that the vehicle is in the second pure electric mode comprises:
    3)P 需求≤P 1+P 2，V≤V 纯电H，P 需求≤P 1，处于第二纯电动模式时综合电机驱动系统效率最佳； 3) P demand ≤ P 1 + P 2 , V ≤ V pure electric H , P demand ≤ P 1 , in the second pure electric mode, the integrated motor drive system is the most efficient;
    其中，P 需求为车辆需求功率；V 纯电H为纯电动模式下车辆的最高车速。 Among them, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed of the vehicle in the pure electric mode.
  9. 根据权利要求6所述的混合动力系统控制方法，其特征在于，判断车辆处于所述第三纯电动模式的判据包括：The hybrid system control method according to claim 6, wherein the criterion for determining that the vehicle is in the third pure electric mode comprises:
    1)P 需求≤P 1+P 2，V≤V 纯电H； 1) P demand ≤ P 1 + P 2 , V ≤ V pure electric H ;
    4)P 需求≤P 1且处于第一、第二纯电动模式时功率均不是最优；或者：P 1＜P 需求＜P 2，且处于第一纯电动模式时不是综合电机驱动效率最佳； 4) P demand ≤ P 1 and power is not optimal in the first and second pure electric modes; or: P 1 <P demand < P 2 , and the first pure electric mode is not the best integrated motor drive efficiency ;
    其中，判据1)、4)为相与的关系，P 需求为车辆需求功率；V 纯电H为纯电动模式下车辆的最高车速。 Among them, the criteria 1), 4) are the relationship, the P demand is the vehicle demand power; the V pure electric H is the maximum vehicle speed of the vehicle in the pure electric mode.
  10. 根据权利要求5所述的混合动力系统控制方法，其特征在于，所述车辆 处于纯电动模式的判据包括动力电池SOC＞SOC L，其中SOC L为纯电动模式的SOC阈值。 The hybrid system control method according to claim 5, wherein the criterion that the vehicle is in the pure electric mode includes the power battery SOC > SOC L , wherein the SOC L is the SOC threshold of the pure electric mode.
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