CN113320374A - Double-motor power converging hybrid power system - Google Patents
Double-motor power converging hybrid power system Download PDFInfo
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- CN113320374A CN113320374A CN202110807649.4A CN202110807649A CN113320374A CN 113320374 A CN113320374 A CN 113320374A CN 202110807649 A CN202110807649 A CN 202110807649A CN 113320374 A CN113320374 A CN 113320374A
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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
- B60K6/24—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the combustion engines
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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
- B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
- B60K6/365—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings with the gears having orbital motion
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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
Abstract
The invention provides a double-motor power converging hybrid power system, and belongs to the field of hybrid power vehicles. The engine and the first motor form a power converging hybrid power system through a composite planetary gear mechanism, and are respectively connected with a small sun gear and a planet carrier of the composite planetary gear mechanism. And the second motor forms a low-speed electric driving system which is in transmission connection with a large sun gear of the compound planetary gear mechanism. Therefore, when a vehicle comprising the power combining hybrid system is in a higher speed, the engine and the motor can be in a parallel driving hybrid state by combining and driving the motor-motor and the high-speed double-power of the engine in parallel, so that the defects of poor working efficiency and poor fuel consumption of the whole power splitting hybrid system can be overcome when the vehicle is in the higher speed compared with the single-mode input power splitting hybrid system in the prior art.
Description
Technical Field
The invention belongs to the field of hybrid vehicles, and particularly relates to a hybrid power system with double-motor power confluence and a hybrid vehicle comprising the same.
Background
The hybrid electric vehicle is a hybrid electric vehicle with two or more energy converters providing driving power. The development of power battery technology is a power driving system of a hybrid electric vehicle, and plays a key role in applying electric drive and engine drive to a double-power driving device. In the prior art, there are a variety of hybrid systems for vehicles with power split capability that enable decoupling between the speed and torque of the vehicle and the speed and torque of the engine. In this type of hybrid powertrain, typically comprising the first purius generation of toyota, single mode input power-split hybrid powertrain, a schematic of the power-split hybrid powertrain is shown in fig. 1.
As shown in fig. 1, the power-split hybrid system includes an engine ICE, a first electric machine EM1 (primarily for generating electricity), a second electric machine EM2 (primarily for generating torque for driving), a planetary gear mechanism P, and a differential DM.
Specifically, the output shaft of the engine ICE is directly connected coaxially to the carrier shaft of the carrier of the planetary gear mechanism P, the input/output shaft of the first electric machine EM1 is directly connected coaxially to the sun gear shaft of the sun gear of the planetary gear mechanism P, and the input/output shaft of the second electric machine EM2 is directly connected coaxially to the ring gear shaft of the ring gear of the planetary gear mechanism P, which is drivingly coupled to the differential DM through a series of drive pairs including a belt drive mechanism. Thus, the first electric machine EM1 generally functions as a generator to effect power regulation of the speed and torque of the engine ICE by the first electric machine EM1, and the second electric machine EM2 generally functions as an electric motor to effect regulation of the torque of the engine ICE by the second electric machine EM2, thereby causing the engine ICE to operate at an optimal engine operating point. However, this system generates an internal power cycle when the vehicle speed reaches a high level, and loses the power regulation function of the first electric machine EM1 on the speed and torque of the engine ICE at high speed. At this time, the second electric machine EM2 acts as a generator and the first electric machine EM1 acts as a motor to output negative torque, thereby causing deterioration in the operation efficiency and fuel consumption of the entire hybrid system.
Disclosure of Invention
The present invention has been made in view of the above-mentioned drawbacks of the prior art. An object of the present invention is to provide a novel power combining hybrid system which can overcome the disadvantages of poor operating efficiency and fuel consumption of the entire hybrid system at high vehicle speeds, as compared to the input type power splitting hybrid system of the prior art. It is another object of the present invention to provide a hybrid vehicle including the above hybrid system.
In order to achieve the above object, the present invention adopts the following technical solutions.
The invention provides a power confluence hybrid system, comprising: and an output shaft of the engine is in transmission coupling with a first sun gear shaft of the first sun gear and in transmission coupling with the one-way clutch. Enabling the engine to transmit torque to the intermediate shaft and the differential via the second sun gear and the compound planetary mechanism after the engine is acted by the planetary gear mechanism and the first sun gear element; the magnitude of the engine output torque is dependent upon the first sun gear torque. The motor I is a power confluence motor. The input/output shaft of the first motor is in transmission connection with the planet carrier shaft of the planet carrier; the first sun gear shaft and the second sun gear shaft are coaxially arranged in a staggered mode, and the first sun gear shaft is arranged on the inner layer. And the second motor is a low-speed motor. An input/output shaft of the second motor is in transmission coupling with a second sun gear shaft of the second sun gear; an input/output shaft of the motor II is in transmission connection with the low-gear shaft; transmitting torque to the differential via an intermediate shaft gearwheel; the transmission comprises a compound planetary gear mechanism, the compound planetary gear mechanism comprises a first sun gear, a second sun gear, a plurality of first planet gears, a plurality of second planet gears, a planet carrier, a second sun gear and an intermediate shaft gear, the compound planetary gear mechanism is in transmission coupling with the differential mechanism, and the differential mechanism is used for being in transmission coupling with wheels of a vehicle;
preferably, an input/output shaft of the first motor is in transmission coupling with a planet carrier shaft of the compound planetary gear mechanism.
Preferably, an input/output shaft of the second motor is in transmission coupling with a second sun gear shaft of the second sun gear; the first sun gear shaft and the second sun gear shaft are coaxially arranged in a staggered mode, and the first sun gear shaft is arranged on the inner layer.
More preferably, an input/output shaft of the second motor is in transmission coupling with the low-gear shaft; torque is transferred to the differential via an intermediate shaft gearwheel.
More preferably, a second sun gear shaft gear of the second sun gear is drivingly coupled with an input/output shaft gear of the second electric motor via a counter gear, and the gear is drivingly coupled with the differential via a counter gear.
More preferably, the second motor is a low-speed motor and is connected with the transmission mechanism in parallel at a certain transmission ratio.
More preferably, the power combining hybrid system further comprises a control module, and the control module can control the power combining hybrid system to enable the power combining hybrid system to realize a pure electric drive mode and a high-low gear power combining hybrid mode.
The power merging hybrid system can realize the pure electric drive mode under the condition that the speed of a vehicle comprising the power merging hybrid system is less than or equal to a first preset speed and is greater than or equal to a preset electric quantity of a power battery, wherein the engine is in a stop state, the second motor is in a running state and transmits torque to the differential for driving; and when the vehicle needs large torque for starting, the second motor and the first motor run simultaneously. The input and output shafts of the engine cannot rotate reversely under the action of the one-way clutch. Under the condition that the speed of the vehicle is greater than the first preset speed and less than or equal to a second preset speed and is greater than or equal to a preset electric quantity of a power battery, the engine is in a stop state, the second motor is in a running state and transmits torque to the differential for driving; under the condition that the speed of the vehicle is greater than the second preset speed and is greater than or equal to the preset electric quantity of the power battery, the engine and the second motor are in a stop state, and the first motor is in a running state and transmits torque to the differential for driving; the input and output shafts of the engine cannot rotate reversely under the action of the one-way clutch.
In the case that the speed of a vehicle including the power merging hybrid system is less than or equal to a first predetermined speed while being less than or equal to a predetermined amount of power of a power battery; or in the case that the speed of the vehicle is greater than the first preset speed and less than or equal to a second preset speed and less than or equal to a preset electric quantity of a power battery, the power merging hybrid system can realize the low-speed power merging mode, wherein the engine, the first motor and the second motor are all in a running state, one part of the torque transmitted to the transmission by the engine is transmitted to the differential through the first planetary gear mechanism for driving, and the other part of the torque is transmitted to the first motor through the compound planetary gear mechanism and the intermediate shaft gear, so that the motor charges the power battery, and the motor transmits the torque to the differential for driving.
In the case where the speed of the vehicle is greater than the second predetermined speed, the power-combining hybrid system is able to achieve the high-speed power-combining hybrid driving mode in which the engine, the first electric machine, and the second electric machine are all in an operating state, a portion of torque transmitted by the engine to the transmission is transmitted to the differential for driving via the compound planetary gear mechanism via a counter shaft gear, and another portion is transmitted to the second electric machine via the compound planetary gear mechanism, causing the electric machine to charge two power batteries, the first electric machine and the engine together transmitting torque to the differential for driving in a fixed ratio.
The invention also provides a hybrid vehicle which comprises the hybrid system in any one of the technical schemes.
By adopting the technical scheme, the invention provides a novel power converging hybrid power system and a hybrid power vehicle comprising the same. The engine and the first motor form a power converging hybrid power system through a composite planetary gear mechanism, and the second motor forms a low-speed electric driving system. Therefore, when a vehicle comprising the power combining hybrid system according to the invention is at a higher speed, the high-speed double-power combined hybrid driving of the vehicle can be realized through the high-speed motor-electric driving system and the power combining hybrid system of the engine, so that the engine and the motor are still in an economic power combining driving hybrid state when the vehicle is at the higher speed, and thus compared with the single-mode input power splitting hybrid system at the high speed in the prior art, the defects of poor working efficiency and poor fuel consumption of the whole power splitting hybrid system at the high speed of the vehicle can be overcome.
Drawings
Fig. 1 is a schematic diagram showing a connection structure of an input-type power split hybrid system according to the related art.
Fig. 2 is a schematic diagram showing a connection structure of a power-combining hybrid system according to an embodiment of the invention.
Description of the reference numerals
The system comprises an ICE engine 2, an EM1 motor I3, an EM2 motor II 4, a P planetary gear mechanism 5, an S1 first sun gear 6, an S2 second sun gear 7, a C planetary carrier 8, an R gear 9, an SG1 countershaft gear 10, a CS countershaft 11, an SG2 countershaft pinion gear 12, a DM differential 13, an RG reduction gear 14, a WH wheel 15, a motor secondary gear 16, a one-way clutch 17, a C planetary gear 18, an electronic control device 19, a countershaft bull gear.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention. In the present invention, "transmission coupling" means that a driving force/torque can be transmitted between two components, and means that the driving force/torque is transmitted between the two components by adopting direct connection or through a traditional gear pair and the like, if not specifically stated.
(Structure of Power-combining hybrid System according to embodiment of the present invention)
As shown in fig. 2, the power-combining hybrid system according to the embodiment of the present invention includes one engine ICE, one-way clutch, two electric machines (i.e., electric machine-EM 1 and electric machine-EM 2), transmission, and differential DM.
Specifically, in the present embodiment, the transmission includes two planetary gear mechanisms (i.e., the first planetary gear mechanism P1 and the second planetary gear mechanism P2, the two planetary gear mechanisms P1, P2 being arranged coaxially) that share a carrier, and a speed reduction mechanism.
Further, the first planetary gear mechanism P1 includes a first sun gear S1, a plurality of first planetary gears, and a first carrier C for holding the plurality of first planetary gears, which are meshed with each other. The first planetary gear mechanism P1 further includes a first sun gear shaft connected to the first sun gear S1, and a first carrier shaft, both of which have center axes coincident with each other. The first carrier shaft is a solid shaft, extends linearly to the right in fig. 2, and is drivingly coupled to the first electric machine EM 1. The first sun gear shaft S1 may be a solid shaft and the second sun gear shaft S2 a hollow shaft, with the first sun gear shaft S1 passing inside the second sun gear shaft S2. Extending linearly to the left in fig. 2 is drivingly coupled to the engine ICE output shaft. The second sun gear shaft S2 is drivingly coupled with the output gear.
The second planetary gear mechanism P2 includes a second sun gear S2, a plurality of second planetary gears, and a second carrier C2 for holding the plurality of second planetary gears that mesh with each other. The second planetary gear mechanism P2 further includes a second sun gear shaft connected to the second sun gear S2 and a second carrier shaft connected to the second carrier C2. The second sun gear shaft S2 is a hollow shaft, and the second sun gear shaft S2 extends linearly toward the left in fig. 2 to be drivingly coupled with the output gear and the counter gear. The second planet carrier is integrated with the first planet carrier and is shared by the two planet rows. The second sun gear shaft S2 and the output gear are drivingly coupled to the differential DM through a counter gear wheel SG1, a counter shaft CS, a counter gear pinion SG2, and a reduction gear RG.
In the present embodiment, the input/output shaft of the first electric motor EM1 enables bidirectional transmission of driving force/torque between the first planetary gear mechanism P1 and the first electric motor EM1 by inputting/outputting the carrier P by the first electric motor. In the case where the first electric machine EM1 is supplied with electric power from a power battery (not shown) as an example of an energy storage device, the first electric machine EM1 acts as a motor to transmit driving force/torque to the carrier P, and in the case where the first electric machine EM1 obtains the transmission of driving force/torque from the carrier P, the first electric machine EM1 acts as a generator to charge the power battery. On the other hand, the axial size of the hybrid system can be reduced compared to a solution in which the electric machine-EM 1 and the carrier P are directly connected in a coaxial manner.
In the embodiment, an input/output shaft gear of the second electric motor EM2 is in transmission coupling with the large gear of the intermediate shaft, so that driving force/torque can be transmitted between the second electric motor EM2 and the second planetary gear mechanism P2 in two directions. Thus, the rated output torque of the second electric machine EM2 does not need to be large to meet the requirement, and therefore the cost consumed by the second electric machine EM2 is reduced. The second sun gear shaft S2 is a hollow shaft, and the second sun gear shaft S2 gear side extends to the left in fig. 2 and is drivingly coupled with the second electric machine EM2 via a countershaft bull gear. The second planet carrier is integrated with the first planet carrier and is shared by the two planet rows. The power-combining hybrid system is capable of achieving the high-speed power-combining hybrid drive mode when the speed of the vehicle is greater than the second predetermined speed. At the moment, the second motor EM2 is driven to exit, and high-speed double-power hybrid driving of the vehicle is realized through a high-speed motor-electric driving system and a power converging hybrid power system of the engine. And the compound planetary gear mechanism is transmitted to the second motor, so that the second motor charges the power battery.
The specific structure of the power combining hybrid system according to the embodiment of the present invention is described above in detail, and the operation mode and the torque transmission path of the power combining hybrid system will be exemplified below.
(operation mode of power-combining hybrid system and transmission path of torque according to embodiment of the present invention)
The power-merging hybrid system according to the embodiment of the invention shown in fig. 2 has seven operation modes, specifically including a pure electric machine driving mode (using the second electric machine EM2 and the first electric machine EM1), a low-gear power-merging hybrid driving mode, a high-gear power-merging hybrid driving mode, a braking energy recovery mode (using the second electric machine EM2), an idle charging mode (using the first electric machine EM1), and a driving/stationary engine-starting mode (starting the engine ICE using the first electric machine EM1 while the pure electric machine-driven vehicle is driving or the vehicle is stationary), and a reverse pure electric driving mode.
During the running of the vehicle comprising the power merging hybrid system, the control module of the power merging hybrid system can control the power merging hybrid system according to the speed of the vehicle to realize the following three driving modes, namely a pure electric driving mode, a low-speed power merging hybrid driving mode and a high-speed power merging hybrid driving mode.
Specifically, in the case where the vehicle speed is less than or equal to the first predetermined speed (i.e., when the vehicle is traveling at a low speed), and the power battery charge amount is greater than or equal to the predetermined charge amount, the power-combining hybrid system is in the electric-only drive mode, in which
The first electric machine EM1 and the engine ICE are in a stopped state, the second electric machine EM2 is in a running state and transmits torque to the differential DM via the intermediate shaft gear for driving;
thus, as shown in fig. 2, the second electric machine EM2 transmits torque for driving via the second electric machine gear → SG1 counter gear wheel → CS counter shaft → SG2 counter gear pinion → RG reduction gear → DM differential → WH wheel.
Under the condition that the vehicle speed is less than or equal to a first preset speed (namely when the vehicle runs at a low speed), and the power battery capacity is less than or equal to a preset capacity, the power combining hybrid system is in a low-gear power splitting hybrid driving mode, wherein the engine ICE, the first electric machine EM1 and the second electric machine EM2 are in a running state;
thus, as shown in fig. 2, a part of the torque transmitted from the engine ICE to the first sun gear of the compound planetary gear mechanism P passes through the carrier shaft → the carrier C1 → the second planetary gear → the second sun gear → SG1 counter shaft gear → CS counter shaft → SG2 counter shaft pinion → RG reduction gear → DM differential → WH wheel. Transmit torque for driving. And the other part of the torque transmitted by the engine ICE to the first sun gear of the planetary gear mechanism P is transmitted to the electric machine-EM 1 through the first carrier shaft → the first carrier C1 → so that the electric machine-EM 1 charges the power battery. The second electric machine EM2 transmits torque for driving via the second electric machine gear → SG1 counter gear → CS counter shaft → SG2 counter gear → RG reduction gear → DM differential → WH wheel.
In the case where the speed of the vehicle is greater than the first predetermined speed and less than or equal to the second predetermined speed (i.e., when the vehicle is traveling at medium speed), and the power battery charge is greater than or equal to the predetermined charge, the power-combining hybrid system is in a pure motor drive mode, in which it is in a pure motor drive mode
The first electric machine EM1 and the engine ICE are at rest, the second electric machine EM2 is in motion and transmits torque for driving via the second electric machine gear → SG1 countershaft bull gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheels.
Thus, as shown in fig. 2, the second electric machine EM2 transmits torque for driving via S2 second sun gear → (engine ICE output shaft is fixed to the housing by the one-way clutch) → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheels.
In the case where the speed of the vehicle is greater than the first predetermined speed and less than or equal to the second predetermined speed (i.e., when the vehicle is running at a medium speed), and the power battery charge amount is less than or equal to the predetermined charge amount, the power split hybrid system is in the high-speed power merge hybrid drive mode in which
The engine ICE, the first electric machine EM1 and the second electric machine EM2 are all in a running state;
thus, as shown in fig. 2, a part of the torque transmitted from the engine ICE to the first sun gear of the planetary gear mechanism P is transmitted for driving via the carrier shaft → the carrier C1 → the second planet → the second sun gear → SG1 counter shaft gear → CS counter shaft → SG2 counter shaft pinion → RG reduction gear → DM differential → WH wheel. And the other part of the torque transmitted by the engine ICE to the first sun gear of the planetary gear mechanism P is transmitted to the electric machine-EM 1 through the first carrier shaft → the first carrier C1 → so that the electric machine-EM 1 charges the power battery. Electric machine two EM2 transfers torque for driving via → SG1 countershaft bull gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheel.
In the case where the speed of the vehicle is greater than the second predetermined speed (i.e., when the vehicle is traveling at high speed), the power-merging hybrid
The system is in a high speed power combining hybrid mode. And is
The engine ICE is in running state, the first electric machine EM1 is in running state and the second electric machine EM2 is in running state;
thus, as shown in fig. 2, a part of the torque transmitted from the engine ICE to the first sun gear of the planetary gear mechanism P is transmitted for driving via the carrier shaft → the carrier C1 → the second planet → the second sun gear → SG1 counter shaft gear → CS counter shaft → SG2 counter shaft pinion → RG reduction gear → DM differential → WH wheel. In the other part, the torque transmitted from the electric machine-EM 1 to the planetary gear mechanism P is transmitted via the carrier C → carrier shaft → second planet wheel → second sun gear → SG1 counter shaft gear → CS counter shaft → SG2 counter shaft pinion → RG reduction gear → DM differential → WH wheel, so that the electric machine-EM 1 transmits the torque for driving. As shown in fig. 2, torque from the WH wheels is transferred via the DM differential → RG reduction gear → SG2 countershaft pinion → CS countershaft → SG1 countershaft bull gear → electric machine two EM2 gear → electric machine two EM2 such that electric machine two EM2 charges the power battery. When the vehicle is at a higher speed, the engine and the motor are still in a hybrid power state of economical power confluence driving.
Further, the control module can also control the hybrid power system to realize a parallel driving mode, when the hybrid power system is in the parallel driving mode,
the engine ICE is in a stop state, and the second electric machine EM2 and the first electric machine EM1 are in a running state;
thus, as shown in fig. 2, electric machine two EM2 transmits torque for driving via electric machine two EM2 gear → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheel electric machine one EM1 transmits torque for driving via carrier → first planet wheel → second sun gear (common carrier is fixed in reverse by one-way clutch OWC) → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheel.
Further, the control module can also control the hybrid power system to realize a braking energy recovery mode, when the hybrid power system is in the braking energy recovery mode,
the second electric machine EM2 is in a running state, the first electric machine EM1 is in a stopped state, and preferably the engine ICE is also in a stopped state;
thus, as shown in fig. 2, torque from the WH wheels is transferred via the DM differential → RG reduction gear → SG2 countershaft pinion → CS countershaft → SG1 countershaft bull gear → electric machine two EM2 gear → electric machine two EM2 such that electric machine two EM2 charges the power battery.
Further, the control module can control the hybrid power system to realize an idle charging mode, when the hybrid power system is in the idle charging mode,
the first electric machine EM1 and the engine ICE are both in a running state, and the second electric machine EM2 is in a stopped state.
Thus, as shown in fig. 2, the engine ICE transfers torque to the electric machine-EM 1 via the first sun gear shaft → the first sun gear S1 → the first planet gear → the first carrier C1 → the electric machine-input/output gear G3, so that the electric machine-EM 1 charges the power battery.
Further, the control module can control the hybrid power system to realize a driving/static start engine mode, and when the hybrid power system is in the driving/static start engine mode, taking the driving start engine ICE as an example, at a high speed, the first electric machine EM1 and the second electric machine EM2 are both in a running state, or at a low speed, the second electric machine EM2 is in a running state, and the engine ICE is transited from a stopping state to a starting state; thus, at low speeds, electric machine two EM2 transfers torque to the engine ICE for cranking of the engine ICE via electric machine two gear → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheels for driving, while electric machine one EM1 transfers torque to the engine ICE via first planet carrier shaft → first planet carrier C1 → first planet → first sun gear S1.
Further, as shown in fig. 2, at high speed, the second electric machine EM2 transmits torque for driving via the second electric machine gear → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheels; at the same time, electric machine one EM1 transfers torque to the engine ICE for starting of the engine ICE via first carrier shaft → first carrier C1 → first planet → first sun gear S1.
Further, the control module can also control the hybrid system to achieve a reverse mode.
The electric machine one EM1 and the engine ICE are both at rest,
thus, as shown in FIG. 2, electric machine two EM2 reverses direction to transfer torque for driving reverse via electric machine two gear → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheels.
As shown in fig. 2, electric machine two EM2 reverses direction and transfers torque for driving reverse via electric machine two gear → SG1 countershaft large gear → CS countershaft → SG2 countershaft pinion → RG reduction gear → DM differential → WH wheel, and torque transferred from engine ICE to compound planetary gear set P is transferred via first sun gear shaft → first sun gear S1 → first planet gear → first carrier shaft → first carrier C1 → to electric machine one EM1, causing electric machine one EM1 to charge the power battery
In addition, the invention also provides a hybrid vehicle comprising the power combining hybrid power system.
The above description has been made in detail on the embodiments of the present invention, but it should be noted that:
I. although the above embodiments have been described, the effects of high-speed seamless coupling, efficiency enhancement and consumption reduction of the hybrid system are achieved by the dual-motor and compound planetary gear mechanism. This effect is also achieved by adding a clutch and a gear shift mechanism as compared to the present invention, but this increases the cost of the overall hybrid system while reducing system reliability.
Although the power-merging hybrid vehicle front drive mechanism employing the two-motor compound planetary gear mechanism has been described in the above embodiment, the present invention is not limited thereto. The double-motor composite planetary gear mechanism can also be used as a rear drive mechanism of the power device of the power combining hybrid vehicle. For example, the second sun gear shaft of the compound planetary gear mechanism is accelerated and then directly connected with the rear drive transmission shaft, and the second motor EM2 penetration type speed reduction gear pair is used as a speed reduction mechanism which is connected with the second sun gear shaft in parallel, so that the purpose of adopting the double-motor compound planetary gear mechanism as the rear drive mechanism of the power combining hybrid vehicle power device is achieved.
Fig. 2 is a schematic diagram, in which the mechanical transmission from the output shaft of the engine ICE to the differential DM via the compound planetary gear mechanism is not shown in detail. In fact, a parallel-axis planetary gear transmission mechanism can be applied to replace a compound planetary gear mechanism to realize the mechanical transmission structure, and the purpose of a double-motor power converging hybrid power system is also achieved. The planet carrier of the parallel shaft planetary gear transmission mechanism is connected with an output gear, the gear ring is connected with an output shaft of the engine, and the sun gear is connected with the first motor. And will not be described in detail herein.
Claims (10)
1. A dual-motor power-combining hybrid system, characterized in that said power-combining hybrid system comprises: an output shaft of the engine is in transmission coupling with the first sun gear; enabling the engine to transmit torque to the differential via a second sun output gear and a countershaft gear after interaction by the compound planetary gear mechanism and the first sun gear element; the magnitude of the engine output torque depends on the first sun gear torque; the motor I is a power confluence motor; the input/output shaft of the first motor is in transmission connection with the planet carrier shaft of the planet carrier; the motor II is a low-gear motor; an input/output shaft of the second motor is in transmission coupling with a second sun gear shaft of the second sun gear; the first sun wheel shaft and the second sun wheel shaft are coaxially arranged in a staggered manner, and the first sun wheel shaft is arranged on the inner layer; an input/output shaft of the motor II is in transmission connection with the low-gear shaft; transmitting torque to the differential via an intermediate shaft gearwheel; the transmission comprises a compound planetary gear mechanism, the compound planetary gear mechanism comprises a first sun gear, a second sun gear, a plurality of first planet gears, a plurality of second planet gears and a planet gear carrier, and the second sun gear output gear and the intermediate shaft gear are in transmission coupling with the differential mechanism; a differential for drivingly coupling with wheels of a vehicle.
2. The dual motor power combining hybrid system of claim 1, wherein the input/output shaft of the first motor is drivingly coupled to the carrier shaft of the planetary carrier of the compound planetary gear mechanism.
3. The dual-motor power-combining hybrid system of claim 1, wherein an input/output shaft of the second motor is drivingly coupled to a second sun shaft of the second sun gear; the first sun wheel shaft and the second sun wheel shaft are coaxially arranged in a staggered manner, and the first sun wheel shaft is arranged on the inner layer; the number of teeth of the output gear of the second sun gear is greater than that of the first sun gear; an input/output shaft of the motor II is in transmission connection with the low-gear shaft; torque is transferred to the differential via an intermediate shaft gearwheel.
4. The dual-motor power-combining hybrid system according to claim 1, wherein a second sun shaft of the second sun gear is drivingly coupled to an input/output shaft of the second motor, the second sun output gear is drivingly coupled to the differential via an intermediate shaft gear, and a second sun output gear tooth count is greater than an intermediate shaft gear tooth count, both of which are step-up drives; an input/output shaft of the second motor is coaxially arranged with the low gear, and the second sun gear shaft is coaxially arranged with the second sun gear output gear; the second motor is a low-gear motor which is connected in parallel with the transmission mechanism in a certain transmission ratio.
5. The power-combining hybrid system of any one of claims 1 to 6, further comprising a control module capable of controlling the power-combining hybrid system to enable the power-combining hybrid system to achieve a motor-only drive mode and a high-speed power-combining hybrid mode.
6. The dual-motor power-merging hybrid system according to claim 1, wherein the power-merging hybrid system is capable of achieving the electric-only driving mode in which the engine is stopped, the second motor is in operation and transmits torque to the differential for driving, in a case where a speed of a vehicle including the power-merging hybrid system is less than or equal to a first predetermined speed while being greater than or equal to a predetermined amount of electric power of a power battery; and when the vehicle needs large torque for starting, the second motor and the first motor simultaneously run in pure electric mode.
7. The two-motor power-merging hybrid system according to claim 1, wherein the power-merging hybrid system is capable of achieving the low-speed power-merging mode in which the engine, the first motor, and the second motor are all in an operating state, a part of torque transmitted from the engine to the transmission is transmitted to the differential for driving via the compound planetary gear mechanism, and another part is transmitted to the first motor via the first sun gear via the compound planetary gear mechanism, causing the motors to charge power batteries, in a case where a speed of the vehicle is greater than the first predetermined speed and less than or equal to a second predetermined speed; the electric machine transmits torque to the differential for driving; and in the case where the speed of the vehicle is greater than the second predetermined speed, the power-combining hybrid system is capable of achieving the high-speed power-combining hybrid drive mode in which the engine, the motor, and both are in an operating state, torque transmitted from the engine to the transmission is transmitted to the differential via the compound planetary gear mechanism via the counter shaft gear for driving, and the motor, first, combines engine torque by driving the compound planetary gear mechanism carrier via the compound planetary gear mechanism, transmits torque to the differential in common via the second sun gear for driving, and motor two is stopped from operating or is used to charge the power battery; and realizing the high-gear power converging hybrid power driving mode.
8. The dual-motor power-merging hybrid system according to claim 1, wherein a dual-motor compound planetary gear mechanism is employed as a power-merging hybrid vehicle power unit rear-drive mechanism; for example, the second sun gear shaft of the compound planetary gear mechanism is directly connected with the rear drive transmission shaft after being geared up, and the second motor EM2 is used as a speed reducing mechanism similar to a speed reducing gear pair in a penetration mode and is connected with the second sun gear shaft after being geared up in parallel, so that the purpose of using the double-motor compound planetary gear mechanism as the rear drive mechanism of the power combining hybrid vehicle power device is achieved.
9. The dual-motor power-converging hybrid system of claim 1, wherein said mechanical transmission is achieved by using a parallel axis planetary gear transmission instead of a compound planetary gear transmission, also for the dual-motor power-converging hybrid system; the planet carrier of the parallel shaft planetary gear transmission mechanism is connected with an output gear, a gear ring is connected with an output shaft of an engine, and a sun gear is connected with a first motor; the purpose of realizing the double-motor power converging hybrid power system by using the parallel shaft planetary gear transmission mechanism is also achieved.
10. A dual motor power-converging hybrid system according to claim 1, wherein the hybrid system comprises the hybrid system of any one of claims 1 to 11.
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