CN112874290A - Power system and hybrid vehicle - Google Patents

Power system and hybrid vehicle Download PDF

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Publication number
CN112874290A
CN112874290A CN201911205976.1A CN201911205976A CN112874290A CN 112874290 A CN112874290 A CN 112874290A CN 201911205976 A CN201911205976 A CN 201911205976A CN 112874290 A CN112874290 A CN 112874290A
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CN
China
Prior art keywords
isg motor
engine
clutch
crankshaft
power system
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Granted
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CN201911205976.1A
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Chinese (zh)
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CN112874290B (en
Inventor
兰新
张宏洲
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
    • B60K6/365—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings with the gears having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/38—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the driveline clutches

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

Abstract

The embodiment of the invention provides a power system and a hybrid vehicle, wherein the power system specifically comprises: the engine, the ISG motor, the planetary gear mechanism and the clutch; the planetary gear mechanism is respectively connected with the ISG motor, the cylinder body of the engine and the first end of the clutch; the second end of the clutch is connected with a crankshaft of the engine. The power system provided by the embodiment of the invention can improve the NVH performance of the hybrid vehicle, reduce the working current and the heat productivity of the ISG motor, improve the efficiency of the ISG motor, reduce the volume of the ISG motor and facilitate the layout of the ISG motor on the crankshaft of the engine.

Description

Power system and hybrid vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a power system and a hybrid vehicle.
Background
With the development of vehicle technology, hybrid vehicles are popular with users due to high fuel economy and excellent driving performance.
In a power system of a hybrid vehicle, an ISG (Integrated Starter Generator) motor can have start-stop, power-assisting and power-generating functions, that is, the ISG motor can drive an engine to rotate, start and stop the engine, provide power under abnormal conditions (such as a sudden increase of torque demand), and charge a power battery under the driving of the engine. In practical applications, the ISG motor is usually mechanically connected coaxially with the engine crankshaft, and the ISG motor and the engine crankshaft rotate in the same direction and at the same rotation speed.
However, in the case where the ISG motor and the engine crankshaft rotate in the same direction, the rotational inertia of the ISG motor and the engine crankshaft are superimposed, resulting in poor NVH (Noise, Vibration, and Harshness) performance of the hybrid vehicle. In addition, since the rotation speeds of the ISG motor and the engine crankshaft are equal, in a starting stage, the rotation speed of the engine is relatively low, and therefore, in order to start the engine, the ISG motor is required to output a relatively large torque under the condition of low-speed rotation, which not only causes a relatively large working current, an increased heat generation amount and a relatively low efficiency of the ISG motor, but also easily causes a relatively large volume of the ISG motor, and is not beneficial to the layout of the ISG motor on the engine crankshaft.
Disclosure of Invention
In order to solve the problems that the NVH performance of a power system is poor, the heating value is large, the efficiency is low and the size of an ISG motor is large in the conventional hybrid vehicle, the embodiment of the invention provides the power system and the hybrid vehicle.
In order to solve the above problem, in a first aspect, an embodiment of the present invention discloses a power system for a hybrid vehicle, including: the engine, the ISG motor, the planetary gear mechanism and the clutch;
the planetary gear mechanism is respectively connected with the ISG motor, the cylinder body of the engine and the first end of the clutch;
the second end of the clutch is connected with a crankshaft of the engine.
In a second aspect, an embodiment of the present invention further discloses a hybrid vehicle, including: the power system
The embodiment of the invention has the following advantages:
in the embodiment of the invention, the planetary gear mechanism is respectively connected with the ISG motor, the cylinder body of the engine and the first end of the clutch; the second end of the clutch is connected with a crankshaft of the engine. In practical applications, the planetary gear mechanism may be configured to convert the rotation of the ISG motor into a reverse rotation, and transmit the reverse rotation to the crankshaft of the engine through the clutch, so as to realize the reverse rotation of the crankshaft, and the ISG motor and the crankshaft may have opposite rotation directions and their rotational inertia may cancel each other. Thus, the NVH performance of the hybrid vehicle can be improved. Moreover, the planetary gear mechanism can realize the function of speed change, reduce the rotating speed of the ISG motor and increase the torque, so the torque requirement of the ISG motor can be reduced, the working current and the heat productivity of the ISG motor can be reduced, the efficiency of the ISG motor can be improved, the volume of the ISG motor can be reduced, and the layout of the ISG motor on the crankshaft of the engine is facilitated.
Drawings
FIG. 1 is a schematic illustration of a power system according to the present disclosure;
FIG. 2 is a detailed schematic diagram of the location of the powertrain I shown in FIG. 1;
description of reference numerals: 10-engine, 101-crankshaft, 11-ISG motor, 111-rotor shaft, 1111-center through hole, 12-planetary gear mechanism, 121-sun gear, 1211-center through hole, 122-planetary gear, 123-planet carrier, 124-ring gear, 13-clutch, 14-belt pulley.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a schematic structural diagram of a power system of the present invention is shown, and referring to fig. 2, a detailed structural diagram of a position of the power system I shown in fig. 1, the power system may be used for a hybrid vehicle, and the power system may specifically include: an engine 10, an ISG motor 11, a planetary gear mechanism 12, and a clutch 13; the planetary gear mechanism 12 is respectively connected with the ISG motor 11, the cylinder block of the engine 10 and the first end of the clutch 13; a second end of the clutch 13 is connected to a crankshaft 101 of the engine 10.
Specifically, one end of the planetary gear mechanism 12 may be connected with the rotor of the ISG motor 11, the other end of the planetary gear mechanism 12 may be connected with a first end of the clutch 13, and the planetary gear mechanism 12 may be used to convert the rotation of the ISG motor 11 into reverse rotation and transmit to the first end of the clutch 13. Since the second end of the clutch 13 is connected to the crankshaft 101 of the engine 10, in the case that the first end and the second end of the clutch 13 are connected, the clutch 13 can transmit the reverse rotation on the first end to the crankshaft 101 of the engine 10 connected to the second end, so as to realize the reverse rotation of the crankshaft 101, so that the rotation directions of the ISG motor 11 and the crankshaft 101 can be opposite, and the rotational inertia of the ISG motor and the crankshaft 101 can be offset with each other, so that the NVH performance of the hybrid vehicle can be improved. Moreover, since the planetary gear mechanism 12 can realize the function of speed change, the planetary gear mechanism 12 can reduce the rotation speed of the ISG motor 11 and increase the torque, so that the torque requirement of the ISG motor 11 can be reduced, the working current and the heat generation amount of the ISG motor 11 can be reduced, the efficiency of the ISG motor 11 can be improved, and the size of the ISG motor 11 can be reduced, which is beneficial to the layout of the ISG motor 11 on the crankshaft 101 of the engine 10.
In the embodiment of the present invention, the planetary gear mechanism 12 is adopted as the speed change mechanism of the power system, and compared with other types of speed change mechanisms such as a flat belt transmission or an external gear transmission arranged in parallel shafts, the planetary gear mechanism 12 can reduce one transmission shaft, so that the volume of the power system can be reduced, and the layout of the power system in the hybrid vehicle is facilitated. In addition, since the planetary gear mechanism 12 has the functions of speed reduction and torque increase, the ISG motor 11 has a smaller size, lighter weight, and more advantageous cost when the ISG motor 11 outputs the same power.
In an alternative embodiment of the present invention, the ISG motor 11, the planetary gear mechanism 12, and the crankshaft 101 of the engine 10 may be coaxially disposed, so as to further improve the compactness of the layout of the power system and reduce the size of the power system.
In practical application, the ISG motor 11 and the planetary gear mechanism 12 may be disposed at the front end of the engine 10, and when the ISG motor 11 and the planetary gear mechanism 12 are disposed coaxially with the crankshaft 101 of the engine 10, the envelope size of the engine FEAD (engine front end accessory drive system) may be reduced, and no negative impact may be caused on the installation and functions of other accessory products, and on the contrary, more space may be saved for arranging other accessory products.
Specifically, since the power system is only arranged at the front end of the engine 10, and has no influence on the rear end structure of the engine 10, a conventional transmission or a hybrid transmission can be used, and the power expansion compatibility is good. Even, a transmission without a low gear can be adopted to reduce the weight and the cost of the whole vehicle.
In an embodiment of the present invention, the planetary gear mechanism 12 may specifically include: a sun gear 121, a plurality of planet gears 122, a planet carrier 123, and a ring gear 124; the plurality of planet wheels 122 and the sun wheel 121 are arranged in the ring gear 124, each planet wheel 122 is meshed with the sun wheel 121 and the ring gear 124 respectively, and the planet carrier 123 is connected with each planet wheel 122; the sun gear 121 is fixedly connected with the ISG motor 11; the carrier 123 is fixed to the cylinder block of the engine 10; the ring gear 124 is connected to a first end of the clutch 13.
In practical applications, since the sun gear 121 is fixedly connected to the ISG motor 11, the power output by the ISG motor 11 can be transmitted to the sun gear 121, so as to drive the sun gear 121 to rotate, and the rotation direction of the sun gear 121 is the same as the rotation direction of the ISG motor 11. Since the carrier 123 is connected to each of the planetary gears 122, the planetary gears 122 are respectively engaged with the sun gear 121 and the ring gear 124, and the carrier 123 is fixed to the cylinder of the engine 10, in the case where the sun gear 121 rotates, the ring gear 124 can be rotated by the engagement between the sun gear 121 and the planetary gears 122 and the engagement between the planetary gears 122 and the ring gear 124, and the ring gear 124 rotates in the opposite direction to the rotation direction of the sun gear 121, and since the rotation direction of the sun gear 121 is the same as the rotation direction of the ISG motor 11, the ring gear 124 rotates in the opposite direction to the rotation direction of the ISG motor 11.
Specifically, since the ring gear 124 is connected to the first end of the clutch 13, the reverse rotation of the ring gear 124 can be transmitted to the first end of the clutch 13, and in the case that the first end and the second end of the clutch 13 are engaged, the clutch 13 can transmit the reverse rotation of the first end to the crankshaft 101 of the engine 10 connected to the second end, so that the crankshaft 101 can rotate in the reverse direction, and the rotational inertias of the ISG motor 11 and the crankshaft 101 can be cancelled out, so that the NVH performance of the hybrid vehicle can be improved.
In practical applications, in the case where the power output by the ISG motor 11 is transmitted to the sun gear 121, the functions of reducing the rotation speed and increasing the torque can be achieved by the engagement between the sun gear 121 and the planetary gears 122, and the engagement between the planetary gears 122 and the ring gear 124. Therefore, in the starting stage of the hybrid vehicle, a large torque can be output at a low rotation speed through the speed reduction and torque increase functions of the planetary gear mechanism 12, so that the torque requirement of the ISG motor 11 can be reduced, the working current and the heat generation amount of the ISG motor 11 can be reduced, and the efficiency of the ISG motor 11 can be improved. In practical application, under the condition that the torque requirement of the ISG motor 11 is low, the volume of the ISG motor 11 can be reduced, which is beneficial to the layout of the ISG motor 11 on the crankshaft 101 of the engine 10.
In the embodiment of the present invention, an ISG motor 11 is provided with a rotor and a rotor shaft 111 connected to the rotor; wherein the rotor is an inner rotor; the rotor shaft 111 is fixedly connected with the sun gear 121, and the rotor is arranged outside the rotor shaft 111. Because the rotor of the ISG motor 11 is the inner rotor, the ISG motor 11 can be used for outputting higher rotating speed and lower torque, and is beneficial to obtaining smaller load inertia, so that the load can obtain higher acceleration rate, and further, the whole power system can have the advantages of high sensitivity, fast response and frequency bandwidth.
In practical application, because the rotor of the ISG motor 11 is the inner rotor, and the stator armature of the ISG motor 11 can be arranged outside the rotor, the stator armature can directly radiate heat through the outer surface, so that the radiating performance is good, and further, the performance of the ISG motor 11 can be good. Moreover, when the rotor of the ISG motor 11 is an inner rotor, the structure of the ISG motor 11 can be made simpler, the size thereof can be made smaller, and the cost thereof can be made lower.
It is understood that, in practical applications, the ISG motor 11 may also adopt other structural forms, for example, the ISG motor 11 may also be an outer rotor motor, an annular motor, or the like, and the ISG motor 11 may also be a direct current motor, an alternating current motor, a synchronous motor, an asynchronous motor, or the like, and the specific form of the ISG motor 11 in the embodiment of the present invention may not be limited.
Alternatively, an external spline may be disposed on a wheel shaft of the sun gear 121, a central through hole 1111 may be disposed on the rotor shaft 111, the central through hole 1111 may be disposed at the center of the rotor shaft 111, and an internal spline is disposed on a side wall of the central through hole 1111, and the internal spline is connected with the external spline to achieve a fixed connection between the rotor shaft 111 and the sun gear 121.
Alternatively, an inner spline may be disposed on a wheel shaft of the sun gear 121, and an outer spline may be disposed on a side wall of the central through hole 1111, where the inner spline is connected to the outer spline to realize a fixed connection between the rotor shaft 111 and the sun gear 121.
In practical applications, since the key connection is easy to implement and the connection strength is high, in the case of implementing the connection between the rotor shaft 111 and the sun gear 121 by using the internal spline and the external spline, the connection between the rotor shaft 111 and the sun gear 121 can be easily implemented and the connection strength is high.
Optionally, a hollow through hole is formed in the sun gear 121, and the crankshaft 101 passes through the through hole to be connected with the second end of the clutch 13, so that the coaxial arrangement of the crankshaft 101, the ISG motor 11 and the planetary gear mechanism 12 can be realized, and the layout compactness of the power system is improved.
Optionally, the power system further comprises: the belt pulley 14 and the belt pulley 14 are fixedly connected with the gear ring 124, so that the belt pulley 14 can be driven to rotate under the condition that the ISG motor 11 drives the gear ring 124 to rotate. The pulley 14 may be connected to a water pump, air conditioner, or the like to power such accessories.
In practical applications, the fixed connection between the pulley 14 and the ring gear 124 can be realized by using a threaded fastener or a welding process, and the fixed connection between the pulley 14 and the ring gear 124 is not particularly limited in the embodiment of the present invention.
Optionally, a belt groove is provided outside the pulley 14, which may be used to accommodate a belt. In practical applications, a person skilled in the art can set the position of the belt groove and the gear ring 124 on the pulley 14 according to actual needs, wherein the belt groove is overlapped with the gear ring 124 in the axial direction of the pulley 14, or the belt groove is offset from the gear ring 124. Embodiments of the present invention may not be limited to the specific location of the belt groove and the ring gear 124 on the pulley 14.
Alternatively, the clutch 13 may be an electromagnetic clutch. Because the electromagnetic clutch has the advantages of fast response, strong durability and easy maintenance and assembly, under the condition that the clutch 13 is the electromagnetic clutch, the clutch 13 correspondingly has the advantages of fast response, strong durability and easy maintenance and assembly.
It is understood that, in practical applications, a person skilled in the art may also use a belleville spring or other clutch structure as the clutch 13 according to actual needs, and the embodiment of the present invention may not be limited to the type and structure of the clutch 13.
One example of an operating strategy for the powertrain is provided below.
In the case where the SOC (state of charge) value of the power battery of the hybrid vehicle is high: in a starting stage, the first end and the second end of the clutch 13 are connected, the engine 10 does not work, and the power output by the ISG motor 11 can be transmitted to the crankshaft 101 of the engine 10 through the planetary gear mechanism 12, transmitted to the transmission through the crankshaft 101 and finally output to the whole vehicle; in the case of low-speed running or low-load and medium-speed running, the first end and the second end of the clutch 13 are engaged, the engine 10 does not work, and the power output by the ISG motor 11 can be transmitted to the crankshaft 101 of the engine 10 through the planetary gear mechanism 12, and is transmitted to the transmission through the crankshaft 101, and finally is output to the whole vehicle; under the condition of low-load high-speed running, the first end and the second end of the clutch 13 are separated, the ISG motor 11 only drives the FEAD, and the engine 10 outputs power to the transmission through the crankshaft 101 and finally to the whole vehicle; in the case of medium and high load running, the first end and the second end of the clutch 13 are engaged, the engine 10 is operated, and meanwhile, the power output by the ISG motor 11 can be transmitted to the crankshaft 101 of the engine 10 through the planetary gear mechanism 12, and is transmitted to the transmission through the crankshaft 101, and is finally output to the whole vehicle, so that auxiliary driving is realized; under the conditions of sliding and braking, the first end and the second end of the clutch 13 are connected, and the planetary gear mechanism 12 reversely drives the ISG motor 11 to rotate, so that energy recovery is realized; the ISG motor 11 can realize the starting and stopping of the engine 10 according to the change condition of the running load; in the case of parking, the first and second ends of the clutch 13 are disengaged, the ISG motor 11 drives the FEAD only to cool the engine 10, and drives the air conditioner on the hybrid vehicle.
When the SOC value of the power battery of the hybrid vehicle is low: in a starting stage, the first end and the second end of the clutch 13 are connected, the engine 10 does not work, and the power output by the ISG motor 11 can be transmitted to the crankshaft 101 of the engine 10 through the planetary gear mechanism 12, transmitted to the transmission through the crankshaft 101 and finally output to the whole vehicle; in the case of low-speed running, the first end and the second end of the clutch 13 are engaged, the engine 10 does not work, and the power output by the ISG motor 11 can be transmitted to the crankshaft 101 of the engine 10 through the planetary gear mechanism 12, and transmitted to the transmission through the crankshaft 101, and finally output to the whole vehicle; under the conditions of low-load medium-speed running and low-load high-speed running, a first end and a second end of a clutch 13 are engaged, an engine 10 is operated to drive an ISG motor 11 to generate electricity so as to charge a power battery of the hybrid vehicle, and meanwhile, power is output to a transmission through a crankshaft 101 and finally output to the whole vehicle; under the condition of medium and high load running, the first end and the second end of the clutch 13 are connected, the engine 10 works, and meanwhile, the power output by the ISG motor 11 can be transmitted to the crankshaft 101 of the engine 10 through the planetary gear mechanism 12, and is transmitted to the transmission through the crankshaft 101, and finally is output to the whole vehicle, so that auxiliary driving is realized; under the conditions of sliding and braking, the first end and the second end of the clutch 13 are connected, and the planetary gear mechanism 12 reversely drives the ISG motor 11 to rotate, so that energy recovery is realized; the ISG motor 11 can realize the starting and stopping of the engine 10 according to the change condition of the running load; in the parking condition, the first end and the second end of the clutch 13 are engaged, the engine 10 is operated, and the ISG motor 11 is driven to generate power to charge the power battery of the hybrid vehicle, and simultaneously the engine 10 can drive the FEAD on the hybrid vehicle for cooling the engine 10 or driving the air conditioner.
It can be seen from the above examples that, during low-speed or low-load driving, the power system outputs power to the entire vehicle in the pure electric mode, and the ISG motor 11 has a wider high-torque range than the engine 10, so that the number of gear shifting operations can be reduced, and the driving smoothness can be improved. Moreover, when the engine 10 does not work, the ISG motor 11 can independently drive the FEAD, so that the work of accessories such as a water pump, an air conditioner and the like is realized; for example, the ISG motor 11 can drive the air conditioner when the vehicle is stopped, and the water pump can be driven continuously, so that the heat load of the power system can be reduced, and the cost of the whole vehicle can be reduced.
In summary, the power system according to the embodiment of the present invention may include at least the following advantages:
in the embodiment of the invention, the planetary gear mechanism is respectively connected with the ISG motor, the engine cylinder block and the first end of the clutch; the second end of the clutch is connected with a crankshaft of the engine. In practical applications, the planetary gear mechanism may be configured to convert the rotation of the ISG motor into a reverse rotation, and transmit the reverse rotation to the crankshaft of the engine through the clutch, so as to realize the reverse rotation of the crankshaft, and the ISG motor and the crankshaft may have opposite rotation directions and their rotational inertia may cancel each other. Thus, the NVH performance of the hybrid vehicle can be improved. Moreover, the planetary gear mechanism can realize the function of speed change, reduce the rotating speed of the ISG motor and increase the torque, so the torque requirement of the ISG motor can be reduced, the working current and the heat productivity of the ISG motor can be reduced, the efficiency of the ISG motor can be improved, the volume of the ISG motor can be reduced, and the layout of the ISG motor on the crankshaft of the engine is facilitated.
The embodiment of the invention also provides a hybrid vehicle which specifically comprises the power system.
In the embodiment of the invention, the planetary gear mechanism of the power system can be used for converting the rotation of the ISG motor into reverse rotation, and transmitting the reverse rotation to the crankshaft of the engine through the clutch to realize the reverse rotation of the crankshaft, so that the rotation directions of the ISG motor and the crankshaft can be opposite, and the rotational inertia of the ISG motor and the crankshaft can be mutually offset. Thus, the NVH performance of the hybrid vehicle can be improved. Moreover, the planetary gear mechanism can realize the function of speed change, reduce the rotating speed of the ISG motor and increase the torque, so the torque requirement of the ISG motor can be reduced, the working current and the heat productivity of the ISG motor can be reduced, the efficiency of the ISG motor can be improved, the volume of the ISG motor can be reduced, and the layout of the ISG motor on the crankshaft of the engine is facilitated.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The present invention provides a power system and a hybrid vehicle, which are described in detail above, and the principles and embodiments of the present invention are explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A powertrain system for a hybrid vehicle, comprising: the engine, the ISG motor, the planetary gear mechanism and the clutch;
the planetary gear mechanism is respectively connected with the ISG motor, the cylinder body of the engine and the first end of the clutch;
the second end of the clutch is connected with a crankshaft of the engine.
2. The powertrain system of claim 1, wherein the ISG motor, the planetary gear mechanism, and a crankshaft of the engine are coaxially arranged.
3. The powertrain system of claim 1, wherein the planetary gear mechanism comprises: the planetary gear set comprises a sun gear, a plurality of planet gears, a planet carrier and a gear ring; wherein,
the planetary gears and the sun gear are arranged in the gear ring, each planetary gear is meshed with the sun gear and the gear ring respectively, and the planetary carrier is connected with each planetary gear;
the sun gear is fixedly connected with the ISG motor;
the planet carrier is fixed on a cylinder body of the engine;
the ring gear is connected with the first end of the clutch.
4. The power system according to claim 3, wherein the ISG motor is provided with a rotor and a rotor shaft connected with the rotor; wherein,
the rotor is an inner rotor;
the rotor shaft is fixedly connected with the sun gear.
5. The power system according to claim 4, wherein an external spline is arranged on a wheel shaft of the sun wheel, a central through hole is arranged on the rotor shaft, and an internal spline is arranged on the side wall of the central through hole;
or an internal spline is arranged on a wheel shaft of the sun wheel, and an external spline is arranged on the side wall of the central through hole;
the internal spline is connected with the external spline.
6. The powertrain system of claim 4, wherein the sun gear shaft is provided with a hollow through bore through which the crankshaft is coupled to the second end of the clutch.
7. The power system of claim 3, further comprising: and the belt pulley is fixedly connected with the gear ring.
8. The power system according to claim 7, wherein a belt groove is provided outside the pulley, and the belt groove is overlapped with the gear ring in the axial direction of the pulley, or the belt groove is offset from the gear ring.
9. The powertrain system of claim 1, wherein the clutch is an electromagnetic clutch.
10. A hybrid vehicle, characterized by comprising: the power system of any one of claims 1 to 9.
CN201911205976.1A 2019-11-29 2019-11-29 Power system and hybrid vehicle Active CN112874290B (en)

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