CN109080431B - Power coupling system of electric automobile and control method thereof - Google Patents

Power coupling system of electric automobile and control method thereof Download PDF

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Publication number
CN109080431B
CN109080431B CN201810835784.8A CN201810835784A CN109080431B CN 109080431 B CN109080431 B CN 109080431B CN 201810835784 A CN201810835784 A CN 201810835784A CN 109080431 B CN109080431 B CN 109080431B
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China
Prior art keywords
gear
power
engine
clutch
driving motor
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CN201810835784.8A
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CN109080431A (en
Inventor
黄向东
黄河
裴锋
张�雄
林济余
王川
王敏
洪兢
何国新
吴为理
莫宇钊
陈强
于佐鑫
李超
黄新志
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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Priority to CN201810835784.8A priority Critical patent/CN109080431B/en
Priority to CN201410340796.5A priority patent/CN105291809B/en
Publication of CN109080431A publication Critical patent/CN109080431A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/62Hybrid vehicles
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

Abstract

The invention discloses an electric automobile power coupling system and a control method thereof, wherein the electric automobile power coupling system comprises the following steps: an engine; a generator; a clutch; a drive motor; the transmission device comprises a first gear, a second gear, a third gear, a fourth gear and a fifth gear, and the first gear is connected with the driven part of the clutch; the second gear is arranged on an output shaft of the driving motor; the first gear and the second gear are both meshed with the third gear; and the third gear is connected with the differential mechanism sequentially through the fourth gear and the fifth gear. The power coupling system of the electric automobile and the control method thereof have the advantages that all parts are reasonable in layout and compact in structure, assembly is facilitated, space is saved, space utilization rate in the automobile is improved, and switching of three working modes can be automatically achieved according to the SOC value of the battery and the requirement of the automobile speed.

Description

Power coupling system of electric automobile and control method thereof
Technical Field
The invention relates to the field of new energy automobiles, in particular to a power coupling system of an electric automobile and a control method thereof.
Background
With the shortage of petroleum resources and the improvement of environmental awareness of people, green and environment-friendly automobile products which can save energy and have low emission or even zero emission are urgently needed. For this reason, governments around the world and automobile manufacturers are increasingly developing different types of electric automobiles. Compared with the traditional internal combustion engine, the traction motor of the electric automobile has a wider working range, and the characteristics of constant torque at low speed and constant power at high speed of the motor are more suitable for the running requirements of the vehicle. In recent years, a power drive system for an electric vehicle and an operation mode thereof have been hot studied.
However, because the traditional engine drive and the motor drive are involved, the structure is often complex, the occupied space is large, and the arrangement of other parts of the vehicle is influenced.
Disclosure of Invention
The invention aims to provide a power coupling system of an electric automobile and a control method thereof, wherein the power coupling system is simple in structure and saves space.
In order to solve the above technical problem, the present invention provides a power coupling system for an electric vehicle, including:
an electric vehicle power coupling system, comprising:
an engine;
the generator is coaxially connected with the engine;
the clutch is arranged between the engine and the generator and comprises a driving part and a driven part which are matched with each other, and the driving part of the clutch is fixed with an output shaft of the engine;
the driving motor is respectively connected with the clutch and the differential mechanism through a transmission device;
the transmission device comprises a first gear, a second gear, a third gear, a fourth gear and a fifth gear, and the first gear is connected with the driven part of the clutch; the second gear is arranged on an output shaft of the driving motor; the first gear and the second gear are both meshed with the third gear; the third gear is connected with the differential mechanism sequentially through the fourth gear and the fifth gear;
in the pure electric mode, the engine and the generator do not work, the clutch is disconnected, and the power of the driving motor is transmitted to the differential mechanism after being subjected to two-stage speed reduction through the second gear, the third gear, the fourth gear and the fifth gear;
in the range extending mode, the clutch is disconnected, the engine drives the generator to generate power so as to charge a battery or supply power to the driving motor, and the power of the driving motor is transmitted to the differential mechanism after being subjected to two-stage speed reduction through the second gear, the third gear, the fourth gear and the fifth gear;
in a hybrid driving mode, the clutch is combined, part of the power of the engine is transmitted to the third gear through the first gear of the gear, the power of the driving motor is transmitted to the third gear through the second gear, the power coupling of the engine and the driving motor is realized, and finally the power is transmitted to the differential mechanism through the fourth gear and the fifth gear.
Preferably, the electric vehicle power coupling system further includes:
and the damper is arranged between the engine and the clutch, the input end of the damper is connected with the engine, and the output end of the damper is connected with the driving part of the clutch.
A control method of an electric vehicle power coupling system, wherein the electric vehicle power coupling system is any one of the electric vehicle power coupling systems, and the method comprises the following steps:
step S21, judging the relation between the battery SOC value and the first threshold value, or simultaneously judging the relation between the battery SOC value and the first threshold value and the relation between the vehicle speed and the second threshold value;
and step S22, switching the working mode of the electric automobile power coupling system according to the judgment result.
Preferably, the first and second liquid crystal display panels are,
when the step S21 determines that the battery SOC value is higher than the first threshold, the step S22 includes: and controlling the engine and the generator not to work, disconnecting the clutch, transmitting the power of the driving motor to the differential mechanism after passing through the transmission device, and enabling the power coupling system of the electric automobile to enter a pure electric mode.
Preferably, the first and second liquid crystal display panels are,
when the step S21 determines that the battery SOC value is lower than the first threshold and the vehicle speed is lower than the second threshold, the step S22 includes: the clutch is controlled to be disconnected, the engine drives the generator to generate electricity to charge a battery or supply power to the driving motor, the power of the driving motor is transmitted to the differential mechanism through the transmission device, and the power coupling system of the electric automobile enters a range extending mode.
Preferably, the first and second liquid crystal display panels are,
when the step S21 determines that the battery SOC value is lower than the first threshold and the vehicle speed is higher than the second threshold, the step S22 includes: controlling the clutch to be engaged, wherein a part of the power of the engine is coupled with the power of the driving motor and is transmitted to the differential; and the other part of power of the engine drives the generator to generate power so as to charge a battery or supply power to the driving motor, and the power coupling system of the electric automobile enters a hybrid driving mode.
Preferably, the control method further includes:
and step S23, controlling the driving motor to generate a braking torque and inducing current in the winding to charge the battery when braking.
The power coupling system of the electric automobile and the control method thereof have the advantages that all parts are reasonable in layout and compact in structure, assembly is facilitated, space is saved, space utilization rate in the automobile is improved, and switching of three working modes can be automatically achieved according to the SOC value of the battery and the requirement of the automobile speed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a power coupling system of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a control method of the electric vehicle power coupling system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an electric vehicle power coupling system operating in an electric-only mode according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electric vehicle power coupling system operating in a range extending mode according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an electric vehicle power coupling system operating in a hybrid mode according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.
Referring to fig. 1, an embodiment of the invention provides a power coupling system for an electric vehicle, including:
an engine 10;
a generator 11 coaxially connected to the engine 10;
a clutch 20 provided between the engine 10 and the generator 11;
the motor 12 is driven and is connected to the clutch 20 and the differential 30, respectively, through a transmission.
The clutch 20 includes a driving portion and a driven portion, which are engaged with each other, and the driving portion of the clutch 20 is fixed to the output shaft 100 of the engine 10.
The transmission comprises in particular gears 21-25, wherein:
the first gear 21 is connected to the driven portion of the clutch 20;
the second gear 22 is provided on the output shaft of the drive motor 12;
the first gear 21 and the second gear 22 are both meshed with the third gear 23;
the third gear 23 is connected to the differential 30 through a fourth gear 24 and a fifth gear 25 in this order.
In the embodiment, the engine 10 is coaxially connected with the generator 11, the structure is more compact, and the transmission efficiency is higher because an additional transmission device between the engine and the generator is omitted. Thus, the output shaft 100 of the engine 10 shown in fig. 1 is coaxial with the motor shaft 110 of the generator 11.
In order to buffer and damp the output of the engine 10, the present embodiment further includes a damper 40 disposed between the engine 10 and the clutch 20, an input end of the damper 40 is connected to the engine 10, and an output end of the damper 40 is connected to an active portion of the clutch 20. Specifically, shock absorber 10 may be a torsional shock absorber or a fluid coupling.
The differential 30 is connected to the drive wheels 60 via drive shafts 50.
In the present embodiment, as another implementation manner, the clutch 20 is a dual clutch including a first clutch and a second clutch, a driven part of the first clutch is connected to the generator 11, and a driven part of the second clutch is connected to the transmission device.
The power coupling system of the electric automobile with the structure has the advantages that all parts are reasonable in layout, the structure is compact, assembly is facilitated, the space is saved, and the space utilization rate in the automobile is improved.
The power coupling system of the present embodiment has a pure electric mode, a range extending mode and a hybrid driving mode, and can automatically switch between the pure electric mode and the range extending mode according to the SOC value of the battery and the vehicle speed requirement, so that a second embodiment of the present invention provides a control method of the power coupling system of the electric vehicle according to the second embodiment of the present invention, please refer to fig. 2, which includes:
step S21, judging the relation between the battery SOC value and the first threshold value, or simultaneously judging the relation between the battery SOC value and the first threshold value and the relation between the vehicle speed and the second threshold value;
and step S22, switching the working mode of the electric automobile power coupling system according to the judgment result.
Specifically, as shown in fig. 3, when step S21 determines that the battery SOC value is higher than the first threshold, step S22 includes: the engine 10 and the generator 11 are controlled not to work, the clutch 20 is disconnected, the power of the driving motor 12 is transmitted to the differential 30 after two-stage speed reduction through the second gear 22, the third gear 23, the fourth gear 24 and the fifth gear 25, the power is transmitted to the driving wheel 60 through the differential 30, at the moment, the vehicle runs in a low-speed area in a pure electric mode, and the power transmission path is shown as an arrow in figure 3.
As shown in fig. 4, when it is determined at step S21 that the battery SOC value is lower than the first threshold value and the vehicle speed is lower than the second threshold value, step S22 includes: when the clutch 20 is controlled to be disconnected, the engine 10 drives the generator 11 to generate power so as to charge the battery or supply power to the driving motor 12, the power of the driving motor 12 is transmitted to the differential 30 after being subjected to two-stage speed reduction through the second gear 22, the third gear 23, the fourth gear 24 and the fifth gear 25, and the power is transmitted to the driving wheels 60 through the differential 30, at the moment, the vehicle runs in a low-speed area in a range-increasing mode, and the power transmission path is shown as an arrow in fig. 4.
As shown in fig. 5, when it is determined at step S21 that the battery SOC value is lower than the first threshold value and the vehicle speed is higher than the second threshold value, step S22 includes: the clutch 20 is controlled to be combined, a part of the power of the engine 10 is transmitted to the third gear 23 through the first gear 21, the power of the driving motor 12 is transmitted to the third gear 23 through the second gear 22, the power coupling of the engine 10 and the driving motor 12 is realized, and finally, the power is transmitted to the differential 30 through the fourth gear 24 and the fifth gear 25; another part of the power of the engine 10 drives the generator 11 to generate electricity to charge the battery or supply power to the driving motor 12, and the vehicle travels in a hybrid driving mode in a high speed region, and the power transmission path is as shown by the arrow in fig. 5.
In the range extending mode, because the SOC value of the battery is low, the generator 11 is used as a starting motor for starting the engine 10, so that the engine 10 drives the generator 11 to charge the battery; when the automobile needs to run at a high speed, the generator 11 is also used as a starting motor for starting the engine 10, the engine 10 outputs driving torque, and the driving motor 12 is used for auxiliary driving to enter a hybrid driving mode.
The three modes are tabulated as follows:
the first threshold is used for judging the SOC value of the battery, the second threshold is used for judging the vehicle speed, the present embodiment does not limit the value ranges of the first threshold and the second threshold, and can be freely set according to a specific control strategy, and the values of the first threshold and the second threshold are different under different control strategies. After the first threshold value and the second threshold value are set, automatic judgment is carried out, and automatic switching is carried out among the three modes according to the judgment result.
In addition, when the automobile brakes, the driving motor 12 generates braking torque to brake the wheels, and induced current generated in a motor winding of the driving motor charges a battery, so that the recovery of braking energy is realized. Thus, the control method of the present embodiment further includes:
and step S23, controlling the driving motor to generate a braking torque and inducing current in the winding to charge the battery when braking.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (6)

1. An electric vehicle power coupling system, comprising:
an engine (10);
a generator (11) coaxially connected to the engine (10);
the clutch (20) is arranged between the engine (10) and the generator (11), the clutch (20) comprises a driving part and a driven part which are matched with each other, and the driving part of the clutch (20) is fixed with an output shaft (100) of the engine (10);
the driving motor (12) is respectively connected with the clutch (20) and the differential (30) through a transmission device;
the transmission device comprises a first gear (21), a second gear (22), a third gear (23), a fourth gear (24) and a fifth gear (25), wherein the first gear (21) is connected with a driven part of the clutch (20); the second gear (22) is arranged on an output shaft of the driving motor (12); the first gear (21) and the second gear (22) are both meshed on the third gear (23); the third gear (23) is connected with the differential (30) through the fourth gear (24) and the fifth gear (25) in sequence;
in the pure electric mode, the engine (10) and the generator (11) do not work, the clutch (20) is disconnected, and the power of the driving motor (12) is transmitted to the differential (30) after being subjected to two-stage speed reduction through the second gear (22), the third gear (23), the fourth gear (24) and the fifth gear (25);
in the range extending mode, the clutch (20) is disconnected, the engine (10) drives the generator (11) to generate electricity so as to charge a battery or supply power to the driving motor (12), and the power of the driving motor (12) is transmitted to the differential (30) after being subjected to two-stage speed reduction through the second gear (22), the third gear (23), the fourth gear (24) and the fifth gear (25);
in a hybrid driving mode, a clutch (20) is combined, one part of power of an engine (10) is transmitted to a third gear (23) through a first gear (21), the power of a driving motor (12) is transmitted to the third gear (23) through a second gear (22), the power coupling of the engine (10) and the driving motor (12) is realized, and finally the power is transmitted to a differential (30) through a fourth gear (24) and a fifth gear (25), and the other part of power of the engine (10) drives a generator (11) to generate power so as to charge a battery or supply power to the driving motor (12);
the method comprises the steps that switching of three modes is automatically achieved according to a battery SOC value and a vehicle speed requirement, and when the battery SOC value is judged to be higher than a first threshold value, a vehicle runs in a pure electric mode;
when the SOC value of the battery is lower than the first threshold value and the vehicle speed is lower than the second threshold value, the vehicle runs in a range extending mode;
when the SOC value of the battery is lower than a first threshold value and the vehicle speed is higher than a second threshold value, the vehicle runs in a hybrid driving mode;
the first threshold value is used for judging the SOC value of the battery, and the second threshold value is used for judging the vehicle speed.
2. The electric vehicle power coupling system of claim 1, further comprising:
the damper (40) is arranged between the engine (10) and the clutch (20), the input end of the damper (40) is connected with the engine (10), and the output end of the damper (40) is connected with the active part of the clutch (20).
3. A control method of an electric vehicle power coupling system, characterized in that the electric vehicle power coupling system is the electric vehicle power coupling system of any one of claims 1-2, and the method comprises:
step S21, judging the relation between the battery SOC value and the first threshold value, or simultaneously judging the relation between the battery SOC value and the first threshold value and the relation between the vehicle speed and the second threshold value;
step S22, switching the working mode of the electric automobile power coupling system according to the judgment result;
when the step S21 determines that the battery SOC value is lower than the first threshold and the vehicle speed is higher than the second threshold, the step S22 includes: controlling the clutch to be engaged, wherein a part of the power of the engine is coupled with the power of the driving motor and is transmitted to the differential; and the other part of power of the engine drives the generator to generate power so as to charge a battery or supply power to the driving motor, and the power coupling system of the electric automobile enters a hybrid driving mode.
4. The control method according to claim 3,
when the step S21 determines that the battery SOC value is higher than the first threshold, the step S22 includes: and controlling the engine and the generator not to work, disconnecting the clutch, transmitting the power of the driving motor to the differential mechanism after passing through the transmission device, and enabling the power coupling system of the electric automobile to enter a pure electric mode.
5. The control method according to claim 3,
when the step S21 determines that the battery SOC value is lower than the first threshold and the vehicle speed is lower than the second threshold, the step S22 includes: the clutch is controlled to be disconnected, the engine drives the generator to generate electricity to charge a battery or supply power to the driving motor, the power of the driving motor is transmitted to the differential mechanism through the transmission device, and the power coupling system of the electric automobile enters a range extending mode.
6. The control method according to claim 3, characterized by further comprising:
and step S23, controlling the driving motor to generate a braking torque and inducing current in the winding to charge the battery when braking.
CN201810835784.8A 2014-07-17 2014-07-17 Power coupling system of electric automobile and control method thereof Active CN109080431B (en)

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CN201410340796.5A CN105291809B (en) 2014-07-17 2014-07-17 A kind of electric powered motor coupled system and its control method

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CN105291809B (en) 2018-09-07
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