CN110901368A - Hybrid power drive system and method - Google Patents
Hybrid power drive system and method Download PDFInfo
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- CN110901368A CN110901368A CN201911142062.5A CN201911142062A CN110901368A CN 110901368 A CN110901368 A CN 110901368A CN 201911142062 A CN201911142062 A CN 201911142062A CN 110901368 A CN110901368 A CN 110901368A
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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
- B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
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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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- 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
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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
- B60K6/38—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
- B60K6/383—One-way clutches or freewheel devices
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- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- 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
The invention discloses a hybrid power driving system and a method, which are used for outputting torque to an external axle and comprise an engine, a first motor, a second motor, a transmission assembly and a battery; the battery is electrically connected with the first motor and the second motor; the transmission assembly comprises a first shaft, a first joint unit, a second shaft, a first transmission mechanism, a second joint unit and a power output unit; the hybrid power driving system and the method have the following advantages: the driving system has the advantages of simple structure, low manufacturing cost and small development difficulty, double-motor driving can be realized by disengaging the first engaging unit and engaging the second engaging unit during operation, the control unit can switch among three power modes of single-motor driving, double-motor driving and three-power-source hybrid driving according to power requirements, the energy efficiency is improved greatly, the designed power degradation of each power source can be correspondingly carried out, and the driving system is compact in integral structure and small in required installation space.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a hybrid power driving system and a method.
Background
With the development of science and technology and the improvement of the transportation level, pollution reduction and emission reduction become necessary and social development consensus. The electric vehicle serving as an urban transportation means is increasingly becoming a mainstream means of transportation, and the pure electric vehicle serving as an urban new energy transportation mainstream means of transportation accounts for 80%, so that pollution emission in cities can be reduced, urban air quality is maintained, and a larger health index is brought to people. However, as a pure electric vehicle, the endurance mileage, the economic efficiency of high-speed driving and the convenience of charging become the first adverse factors which disturb the traveling of most users. Thus, a variety of hybrid drives have emerged, including plug-in hybrid, 48V, extended range, and the like. The plug-in type forced mixing needs to add a set of three-electric system on the original fuel vehicle, so that the cost is overhigh, and the plug-in type forced mixing is generally only used in vehicles of B-level and above; 48V cannot use a pure electric driving mode, and absolute pollution and emission reduction effects cannot be brought when the vehicle runs in an urban area; the range-extending type is divided into a series range-extending type and a series-parallel range-extending type, when the electric quantity is insufficient, the series connection completely generates electricity through an engine, a motor drives, a transmission path of energy flow is increased, the efficiency is reduced, and under the condition of high speed (generally exceeding 80km/h), the efficiency of the motor is reduced, so that the overall efficiency is lower than the pure fuel oil driving efficiency, and the same is true in a pure electric mode. The series-parallel connection extended range is represented by multi-mode boxes such as Gikaien at present, but an engine and a motor are limited by a single reduction ratio, the requirements of rotating speed and torque under good working conditions cannot be well exerted, the motor also has the efficiency problem in a high-speed state, and the generator and the engine are not in a clutch state, so that energy distribution management is required, and the complexity of an electric control system or the inefficiency of the system efficiency is increased.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a hybrid power driving system and a hybrid power driving method, and aims to solve the problems of single power mode, high system assistance and low efficiency of the current hybrid power system.
The technical scheme is as follows: in order to achieve the above object, the hybrid drive system of the present invention is a hybrid drive system for outputting torque to an external axle, comprising an engine, a first motor, a second motor, a transmission assembly, and a battery;
the battery is electrically connected with the first motor and the second motor;
the transmission assembly includes:
the second motor is in driving connection with the first shaft;
a first engagement unit for establishing or breaking a power connection relationship of the generator with the first shaft;
a second shaft disposed parallel to the first shaft; the first motor is in driving connection with the first motor;
a first transmission mechanism provided between the first shaft and the second shaft to transmit power therebetween;
the second joint unit is arranged on the first shaft or the second shaft and used for establishing or disconnecting the power connection relationship between the shaft where the second joint unit is arranged and the first transmission mechanism; and
and the second shaft is in driving connection with the power output unit.
Further, the transmission assembly further comprises:
a one-way clutch provided on the second shaft so that power can be transmitted in a forward direction but not in a reverse direction between the first transmission mechanism and the second shaft.
Further, the first and/or second electric machines may act as generators to reverse the charging of the battery.
Furthermore, at least the first motor can be used as a generator to generate electricity, and a direct power supply circuit is arranged between the first motor and the second motor.
Further, the power take-off unit includes a differential connected to an external axle;
and the second shaft is fixedly connected with a first gear clamped with the outer side gear of the differential.
Further, the second motor establishes a driving relationship with the first shaft through a first gear set.
Further, the first electric machine establishes a driving relationship with the second shaft through a second gear set.
Further, the transmission assembly further comprises a box body, and the first shaft, the first joint unit, the second shaft, the first transmission mechanism, the second joint unit and the power output unit are all installed in the box body.
The hybrid driving method is applied to a control unit based on the hybrid driving system, and the control unit is electrically connected with the first motor, the second motor, the engine, the first joint unit and the second joint unit; the control unit at least stores a first threshold value and a second threshold value, and the method comprises the following steps:
acquiring vehicle speed data and required torque data of a vehicle;
judging the relation between the vehicle speed data and the required torque data and the first threshold and the second threshold respectively;
when the vehicle speed data is smaller than a first threshold value and the required torque data is smaller than a second threshold value, switching to a single motor driving mode to output torque; the first motor outputs power independently in the single motor driving mode;
when the vehicle speed data is smaller than a first threshold value and the required torque data is larger than a second threshold value, switching to a dual-motor driving mode to output torque; the first motor and the second motor are connected in parallel to output power in the dual-motor driving mode;
when the vehicle speed data is greater than a first threshold value and the required torque data is greater than a second threshold value, switching to a three-power-source hybrid driving mode to output torque; and under the three-power-source hybrid driving mode, the first motor, the second motor and the engine are connected in parallel to output power.
Has the advantages that: the hybrid power driving system and the method have the following advantages: the driving system has the advantages of simple structure, low manufacturing cost and small development difficulty, double-motor driving can be realized by disengaging the first engaging unit and engaging the second engaging unit during operation, the control unit can switch among three power modes of single-motor driving, double-motor driving and three-power-source hybrid driving according to power requirements, the energy efficiency is improved greatly, the designed power degradation of each power source can be correspondingly carried out, and the driving system is compact in integral structure and small in required installation space.
Drawings
FIG. 1 is a block diagram of a hybrid drive system according to a first embodiment;
FIG. 2 is a schematic flow chart of a hybrid drive system according to a first embodiment;
fig. 3 is a structural diagram of a hybrid drive system of a second embodiment.
In the figure: 1-an engine; 2-a first electric machine; 3-a second motor; 4-a transmission assembly; 401-a first axis; 402-a first engagement unit; 403-a second axis; 404-a second engagement unit; 405-a one-way clutch; 406-a differential; 407-a first gear; 408-a box body; 409-a second gear; 410-a third gear; 411-fourth gear; 412-fifth gear; 413-sixth gear; 414-seventh gear; 5-a battery; 6-direct power supply line; 7-a control unit.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example one
The present embodiment provides a hybrid drive system (hereinafter referred to as "drive system") for outputting torque to an external axle for the purpose of driving wheels to rotate so that a vehicle on which the drive system is mounted travels.
As shown in fig. 1, the driving system includes an engine 1, a first electric machine 2, a second electric machine 3, a transmission assembly 4 and a battery 5.
In a preferred embodiment, the first motor 2 and the second motor 3 are both power generating motors, and when the first motor 2 and the second motor 3 are passively operated by torque input, the first motor 2 and the second motor 3 can generate electric energy to reversely charge the battery 5, so that the electric motors can supplement the electric energy to the battery 5 under appropriate vehicle conditions (such as vehicle deceleration conditions), and the cruising level of the vehicle is improved.
The transmission assembly 4 is in the form of a gear box, as shown in fig. 1, and includes a box 408, components such as a gear set and a transmission shaft are provided in the box 408, three mounting ports for mounting a power source are provided on a side wall of the box 408, and the engine 1, the first motor 2, and the second motor 3 are respectively mounted at a mounting port position, and are engaged with a plurality of components in the box 408 to generate power interaction with the transmission assembly 4, so as to perform a driving task during a vehicle driving process. The battery 5 is externally disposed in the case 408.
Specifically, the case 408 is provided therein with a first shaft 401, a first engagement unit 402, a second shaft 403, a first transmission mechanism, a second engagement unit 404, and a power output unit. The connection and transmission relationships of the components will be described in detail below.
The second motor 3 is in driving connection with the first shaft 401, that is, one of the second motor 3 and the first shaft 401 is in operation with the other one of the second motor 3 and the first shaft 401, for example, the second motor 3 itself is used as a motor to rotate and drive the first shaft 401 to rotate, and when the second motor 3 itself is not in operation, the first shaft 401 is driven by other power sources to rotate and also drive the second motor 3 to rotate passively, so that the second motor 3 is used as a generator to charge the battery 5 reversely. In this embodiment, the second motor 3 is not directly connected to the first shaft 401, the second motor 3 is in a transmission relationship with the first shaft 401 through a first gear set, that is, the output shaft of the second motor 3 is connected to a second gear 409, the first shaft 401 is fixedly mounted with a third gear 410 engaged with the second gear 409, and the first gear set provides the first transmission ratio to both the second motor 3 and the first shaft 401.
A first engagement unit 402 is provided between the output shaft of the engine 1 and the first shaft 401, and the first engagement unit 402 is capable of establishing or releasing a power connection relationship between the output shaft of the engine 1 and the first shaft 401, and here, the first engagement unit 402 is a clutch, and by controlling an engagement and disengagement state of the clutch, power transmission between the output shaft of the engine 1 and the first shaft 401 is enabled or disabled.
The second shaft 403 is disposed parallel to the first shaft 401, the first motor 2 is in driving connection with the first shaft 401, where the meaning of the driving connection is the same as that of the driving connection between the second motor 3 and the first shaft 401, and in this embodiment, the first motor 2 is not directly connected to the second shaft 403, but establishes a driving connection relationship between the first motor and the second shaft through a second gear set, the second gear set includes a fourth gear 411 connected to an output shaft of the first motor 2 and a fifth gear 412 fixedly connected to the second shaft 403, and the fourth gear 411 and the fifth gear 412 are engaged to provide a second transmission ratio for both the first motor 2 and the second shaft 403.
A first transmission mechanism is provided between the first shaft 401 and the second shaft 403 to transmit power therebetween; the second engagement unit 404 is provided on the first shaft 401 for establishing or breaking a power connection relationship of the first shaft 401 with the first transmission mechanism. Specifically, in the present embodiment, the first transmission mechanism is a gear set including a sixth gear 413 mounted on the first shaft 401 and a seventh gear 414 fixed to the second shaft 403, the sixth gear 413 is engaged with the seventh gear 414, the second engagement unit 404 is disposed between the first shaft 401 and the sixth gear 413, where the second engagement unit 404 is a clutch or a synchronizer, and when the first shaft 401 and the sixth gear 413 are in a relatively fixed state when the second engagement unit is in an engaged state, the first transmission mechanism can transmit power between the first shaft 401 and the second shaft 403, and provide a third transmission ratio to the first shaft 401 and the second shaft 403.
In other embodiments, a second engagement unit 404 may be provided on the or the second shaft 402 for establishing or breaking a power connection relationship between the seventh gear 414 and the second shaft 403.
In addition, the first transmission mechanism may also include a plurality of pairs of gear sets disposed between the first shaft 401 and the second shaft 403, and the gear ratios of the gear sets in each pair are different, in this case, the second engagement unit 404 is a synchronizer, and the synchronizer may give different gear ratios to both the first shaft 401 and the second shaft 403 by causing different gear sets to generate a power transmission action, thereby completing the gear shift operation.
The power take-off unit is connected to the outer axle to output torque to the outer axle, with the second shaft 403 being in driving connection therewith. Specifically, the power output unit includes a differential 406, the differential 406 is connected to an external axle, and a first gear 407 engaged with an outer gear of the differential 406 is attached to the second shaft 403.
In order to make the power units and the engagement units controllable for controlling the power modes in different vehicle conditions, the drive system further comprises a control unit 7, the control unit 7 electrically connecting said first electric machine 2, second electric machine 3, engine 1, first engagement unit 402 and second engagement unit 404.
Based on the above structure and circuit, the driving system can realize three power modes, which are respectively introduced as follows:
the first mode is as follows: single motor drive mode. This mode is suitable for a case where the requirement for torque is low, such as a low speed case, in which the first electric motor 2 is used for driving alone, and the second engagement unit 404 is in the disengaged state, and the power of the first electric motor 2 is directly transmitted to the differential 406 through the second shaft 403. In this mode, the first engaging unit 402 may be in a disconnected state, or the first engaging unit 402 may also be in an engaged state, and when the first engaging unit 402 is in the engaged state, the control unit 7 may start the engine 1 to drive the second motor 3 to passively operate as an engine to charge the battery 5. In other embodiments, a direct power supply line 6 is provided between the first motor 2 and the second motor 3, and the control unit 7 can control the connection between the direct power supply line 6 and the connection between the battery 5 and the first motor 2 and the second motor 3, and if necessary, the control unit 7 can disconnect the connection between the battery 5 and the two motors and connect the direct power supply line 6 so that the second motor 3 directly generates power to the first motor 2.
And a second mode: dual motor drive mode. This mode is suitable for a case where a larger driving force is required for acceleration, climbing, or the like, in which both the first motor 2 and the second motor 3 are in an operating state, the second engagement unit 404 is in an engaged state, the first engagement unit 402 is in an engaged state, and the first motor 2 and the second motor 3 output power in parallel to the second shaft 403.
And a third mode: three-power source hybrid drive mode. This mode is suitable for high speed (vehicle speeds above 80KM/h) conditions where the efficiency of the motor drive may be higher than the motor efficiency due to motor efficiency issues at high speeds, and so the choice of motor intervention is beneficial to drive efficiency. The process of entering the three-power source hybrid drive mode is as follows: initially, the first engaging unit 402 and the second engaging unit 404 are both in a disconnected state, and first, the first engaging unit 402 is switched to an engaged state, at this time, since the second motor 3 is in a running state, the second motor 3 can start the engine 1 in a reverse-thrust manner and perform speed regulation control, and when the rotating speed reaches a speed that can be synchronously connected in parallel with the first motor 2, the second engaging unit 404 is controlled to engage so that the three power sources are driven in parallel. Under the conditions of braking, speed reduction and the like, the first motor 2 and the second motor 3 can be used as generators to recover kinetic energy and convert the kinetic energy into electric energy to reversely charge the battery 5.
The driving unit 7 can control the driving system to switch among three modes, so that the designed power of each power source can be subjected to power degradation, a motor and an engine with smaller power can be adopted, firstly, the power mode matched with the motor and the engine can be switched according to requirements, the energy utilization rate is improved, and secondly, the power of the motor and the power of the engine are smaller, the size of the motor and the engine is correspondingly smaller, so that the whole structure of the driving system is compact, the size of the driving system is small, and the installation space is saved.
The present embodiment also provides a hybrid drive method based on the above drive system, which is applied to a control unit 7, the control unit 7 having stored therein at least a first threshold value corresponding to vehicle speed data and a second threshold value corresponding to required torque data, as shown in fig. 2, and the method includes the following steps a1-a 5:
step A1, acquiring vehicle speed data and required torque data of a vehicle;
in this step, the vehicle speed data and the required torque data are acquired by the control unit 7 from the vehicle-mounted control system, or the control unit 7 is the vehicle-mounted control system itself, and the vehicle-mounted control system directly reads these data from the vehicle operation data.
Step A2, judging the relation between the vehicle speed data and the required torque data and a first threshold value and a second threshold value respectively;
step A3, when the vehicle speed data is less than a first threshold value and the required torque data is less than a second threshold value, switching to a single motor driving mode to output torque;
step A4, when the vehicle speed data is less than a first threshold value and the required torque data is greater than a second threshold value, switching to a dual-motor driving mode to output torque;
and step A5, when the vehicle speed data is larger than a first threshold value and the required torque data is larger than a second threshold value, switching to the three-power-source hybrid driving mode to output the torque.
By the driving method, the driving system can reasonably plan the power output mode, so that the vehicle can always run at higher efficiency.
Example two
The present embodiment provides a hybrid drive system (hereinafter referred to as "drive system") for outputting torque to an external axle for the purpose of driving wheels to rotate so that a vehicle on which the drive system is mounted travels.
As shown in fig. 3, the structure of the drive system in this embodiment is substantially the same as that of the drive system in the first embodiment, and the only difference is that the transmission assembly 4 in this embodiment further includes a one-way clutch 405 in addition to the case 408, the first shaft 401, the first engagement unit 402, the second shaft 403, the first transmission mechanism, the second engagement unit 404, and the power output unit described in the first embodiment, and the one-way clutch 405 is disposed on the second shaft 403, so that power can be transmitted in the forward direction and power cannot be transmitted in the reverse direction between the first transmission mechanism and the second shaft 403, that is, the first shaft 401 can transmit power to the second shaft 403 through the first transmission mechanism, and the second shaft 403 cannot transmit power to the first transmission mechanism in the reverse direction.
Based on the driving system of the present embodiment, the control unit 7 can also realize three power modes similar to one of the embodiments, i.e., the single-motor driving mode, the two-motor driving mode, and the three-power-source hybrid driving mode, through each power source and the engagement unit, with the difference that: when the single-motor driving mode is switched to the double-motor driving mode, the second motor 3 does not need to be pre-regulated to enable the rotating speed to reach the condition that the second motor 3 can be connected in parallel, and then the second engaging unit 404 is controlled to be engaged, because the rotating speed of the second motor 3 is lower, the one-way clutch 405 is in the reverse rotatable state, the second shaft 403 does not waste power to promote the power of the second motor 3, when the rotating speed of the second motor 3 reaches the condition that the second motor 3 can be driven in parallel with the first motor 2, the one-way clutch 405 is automatically switched to the forward locking state, and the power of the second motor 3 can be loaded to the second shaft 403 to increase the torque to promote the acceleration or climbing capacity of the vehicle.
Similarly, in the process of switching to the three-power-source hybrid driving mode, the switching process according to the first embodiment is not required, the control unit 7 may directly control the first engaging unit 402 to engage with the second engaging unit 404, the second motor 3 reversely supports the engine 1 to start, and when the rotation speeds of the two are increased together to satisfy the parallel connection condition, the one-way clutch 405 may be switched from the reverse rotatable state to the forward locking state to realize the parallel connection of the three power sources.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. The hybrid power driving system is used for outputting torque to an external axle and is characterized by comprising an engine, a first motor, a second motor, a transmission assembly and a battery;
the battery is electrically connected with the first motor and the second motor;
the transmission assembly includes:
the second motor is in driving connection with the first shaft;
a first engagement unit for establishing or breaking a power connection relationship of the generator with the first shaft;
a second shaft disposed parallel to the first shaft; the first motor is in driving connection with the first motor;
a first transmission mechanism provided between the first shaft and the second shaft to transmit power therebetween;
the second joint unit is arranged on the first shaft or the second shaft and used for establishing or disconnecting the power connection relationship between the shaft where the second joint unit is arranged and the first transmission mechanism; and
and the second shaft is in driving connection with the power output unit.
2. The hybrid drive system of claim 1, wherein the transmission assembly further comprises:
a one-way clutch provided on the second shaft so that power can be transmitted in a forward direction but not in a reverse direction between the first transmission mechanism and the second shaft.
3. A hybrid drive system as defined in claim 1, wherein the first and/or second electric machines are operable as generators to reverse the direction of charge of the battery.
4. A hybrid drive system according to claim 1, wherein at least the first electric machine is operable as a generator to generate electricity and a direct supply line is provided between the first electric machine and the second electric machine.
5. The hybrid drive system of claim 1, wherein the power take-off unit includes a differential, the differential connecting external axles;
and the second shaft is fixedly connected with a first gear clamped with the outer side gear of the differential.
6. The hybrid drive system of claim 1 wherein said second electric machine is in driving relationship with said first shaft through a first gear set.
7. The hybrid drive system of claim 1, wherein the first electric machine is in a driving relationship with the second shaft through a second gear set.
8. The hybrid drive system of claim 1, wherein the transmission assembly further comprises a case, and the first shaft, the first engagement unit, the second shaft, the first transmission mechanism, the second engagement unit, and the power take-off unit are all mounted within the case.
9. A hybrid drive method based on the hybrid drive system according to any one of claims 1 to 8, characterized in that the method is applied to a control unit that electrically connects the first electric machine, the second electric machine, an engine, a first engagement unit, and a second engagement unit; the control unit at least stores a first threshold value and a second threshold value, and the method comprises the following steps:
acquiring vehicle speed data and required torque data of a vehicle;
judging the relation between the vehicle speed data and the required torque data and the first threshold and the second threshold respectively;
when the vehicle speed data is smaller than a first threshold value and the required torque data is smaller than a second threshold value, switching to a single motor driving mode to output torque; the first motor outputs power independently in the single motor driving mode;
when the vehicle speed data is smaller than a first threshold value and the required torque data is larger than a second threshold value, switching to a dual-motor driving mode to output torque; the first motor and the second motor are connected in parallel to output power in the dual-motor driving mode;
when the vehicle speed data is greater than a first threshold value and the required torque data is greater than a second threshold value, switching to a three-power-source hybrid driving mode to output torque; and under the three-power-source hybrid driving mode, the first motor, the second motor and the engine are connected in parallel to output power.
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Address after: No.66 Lijiang Road, Yancheng Economic and Technological Development Zone, Jiangsu Province 224000 Applicant after: Jiangsu New Energy Vehicle Research Institute Co.,Ltd. Address before: Room 1602, L / F, Yanwu Oriental Poly Plaza, 589 Tongbei Road, Yangpu District, Shanghai 200082 Applicant before: Jiangsu New Energy Vehicle Research Institute Co.,Ltd. |
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Application publication date: 20200324 |