CN112549940A - Dual motor drive system for electric vehicle - Google Patents

Dual motor drive system for electric vehicle Download PDF

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Publication number
CN112549940A
CN112549940A CN202110116478.0A CN202110116478A CN112549940A CN 112549940 A CN112549940 A CN 112549940A CN 202110116478 A CN202110116478 A CN 202110116478A CN 112549940 A CN112549940 A CN 112549940A
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CN
China
Prior art keywords
clutch
shaft
motor
lock
electric machine
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202110116478.0A
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Chinese (zh)
Inventor
崔小雷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Paiteng Aopu Technology Service Beijing Co ltd
Original Assignee
Paiteng Aopu Technology Service Beijing Co ltd
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Publication date
Application filed by Paiteng Aopu Technology Service Beijing Co ltd filed Critical Paiteng Aopu Technology Service Beijing Co ltd
Priority to CN202110116478.0A priority Critical patent/CN112549940A/en
Publication of CN112549940A publication Critical patent/CN112549940A/en
Withdrawn legal-status Critical Current

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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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion

Abstract

The invention relates to a dual-motor transmission system of an electric vehicle. The dual-motor transmission system is provided with a first motor, a second motor and a planetary mechanism, and realizes stepless speed change. According to the electric vehicle provided by the invention, the working condition range of the electric vehicle is expanded and the economical efficiency is improved by arranging the double motors and the continuously variable transmission.

Description

Dual motor drive system for electric vehicle
Technical Field
The invention belongs to the field of vehicles, and particularly relates to a transmission system for an electric vehicle.
Background
Electric vehicles are usually equipped with a drive motor and a retarder, but because of the few gear positions of the retarder, the requirements of drivers under various working conditions cannot be met generally.
Disclosure of Invention
The invention aims to provide a dual-motor transmission system for an electric vehicle.
The method is realized by the following technical means:
the double-motor transmission system of the electric vehicle comprises a first locking clutch, a first motor, a first shaft, a second motor, an inter-shaft clutch, a second shaft, a second locking clutch, an output shaft and a planetary gear assembly, wherein the planetary gear assembly comprises a planetary gear, a planetary carrier, a sun gear and a large gear ring.
The first motor is drivingly connected to a first shaft, one end of which is connected to the sun gear to transmit the driving force of the first motor to the sun gear, and the other end of which is connected to a first lock clutch that is also fixedly connected to the housing so as to selectively lock the first shaft by the first lock clutch.
The sun gear meshes with planetary gears that are supported by the carrier, and the carrier is connected to the output shaft to output power through the carrier.
The second electric machine is in driving connection with a second shaft, which is arranged coaxially with the first shaft and is also connected to a large ring gear, which meshes with the planet gears.
One end of the second lock-up clutch is connected with the housing, and the other end of the second lock-up clutch is connected with the large ring gear to selectively fixedly connect the large ring gear to the housing through the second lock-up clutch.
One side of the inter-shaft clutch is connected with the second shaft, the other side of the inter-shaft clutch is connected with the first shaft, and the second shaft is rigidly connected with the first shaft through the inter-shaft clutch.
The transmission system further includes a controller configured to:
in response to the electric vehicle speed demand being less than a first vehicle speed threshold and the driver power demand being less than a first power threshold, commanding the second lock-up clutch to engage the lock-up bull ring, commanding the first lock-up clutch to disengage, commanding the inter-axle clutch to disengage, enabling the first electric machine, disabling the second electric machine, such that the output power of the first electric machine is transmitted through the sun gear, the planet gears, the bull ring, and the planet carrier to the output shaft, such that the power of the first electric machine is transmitted to the drive axle or wheels;
in response to an electric vehicle speed demand being greater than a first vehicle speed threshold and less than a second vehicle speed threshold, a driver demand being greater than a first power threshold and less than a second power threshold, commanding the second lock-up clutch to disengage, commanding the first lock-up clutch to engage, commanding the inter-axle clutch to disengage, enabling the second electric machine, disabling the first electric machine, such that the output power of the second electric machine is transmitted through the large ring gear, the planet gears, the sun gear, and the planet carrier to the output shaft, thereby transmitting the power of the second electric machine to the drive axle or drive wheels;
in response to the electric vehicle speed demand being greater than a first vehicle speed threshold and less than a second vehicle speed threshold and the driver demand being greater than a second power threshold, commanding the second lock-up clutch to be disconnected, commanding the first lock-up clutch to be disconnected, commanding the inter-axle clutch to be disconnected, activating the second motor and the first motor so that the output power of the second motor and the output power of the first motor are coupled and output through the large ring gear, the planetary gears and the sun gear, are jointly transmitted to the planet carrier, and transmitting power to an output shaft through the planet carrier, so that the power of the second motor and the power of the first motor are coupled and transmitted to a drive axle or a drive wheel;
in response to the electric vehicle speed demand being greater than a second vehicle speed threshold, commanding the second lock-up clutch to be disconnected, commanding the first lock-up clutch to be disconnected, commanding the inter-axle clutch to be combined, and enabling the second motor and the first motor, so that the output power of the second motor and the output power of the first motor are output in series through a planetary gear set, are jointly transmitted to the planet carrier, and are transmitted to an output shaft through the planet carrier, and therefore the power of the second motor and the power of the first motor are transmitted to a driving axle or a driving wheel after being coupled;
commanding engagement of at least two of the second lock-up clutch, first lock-up clutch, and inter-axle clutch to lock-up the dual-motor drive system in response to an electric vehicle park request.
The first motor and the second motor are disposed on the same side of the planetary gear assembly.
The first motor and the second motor are arranged on two sides of the planetary gear assembly.
The power of the second motor is greater than the power of the first motor.
And the second locking clutch, the first locking clutch and the inter-shaft clutch are all electromagnetic jaw clutches.
The invention has the following effects:
1, through setting up the two motors of power, can enlarge electric vehicle's operating mode scope to can the exclusive use first motor drive electric vehicle at the highway section that blocks up travel, thereby can avoid having the work of great powerful second motor in the high-efficient district of non-, with the power efficiency who promotes whole car.
2, the double-motor drive is started when the vehicle load is large or the vehicle climbs a slope, so that the dynamic property of the electric vehicle can be improved, meanwhile, the planetary assembly is coupled with the double motors, the stepless regulation of the speed ratio can be realized, more vehicle working conditions are adapted, and the matching of the economical efficiency and the dynamic property can be realized by continuously optimizing a control strategy.
And 3, the planetary gear assembly can be locked by combining and disconnecting the clutch, so that the direct output of double motors or single motor is realized, the application of the commercial vehicle is more met, and the comprehensive efficiency of the whole vehicle is improved.
And 4, the P-gear requirement can be realized by combining and disconnecting the clutch, parts such as a P-gear parking mechanism and the like can be saved, and the system cost is reduced.
5, through arranging each part and carrying out specific setting with each other's combination mode of each part wholly, can improve whole car transmission efficiency.
Drawings
Fig. 1 is a schematic diagram of a transmission system of an electric vehicle according to a first embodiment.
Fig. 2 is a schematic diagram of a transmission system of an electric vehicle according to a second embodiment.
Wherein: 1-a first lock-up clutch, 2-a first motor, 3-a first shaft, 4-a second motor, 5-an inter-shaft clutch, 6-a second shaft, 7-a sun gear, 8-a big gear ring, 9-a second lock-up clutch, 10-a planet gear, 11-a planet carrier and 12-an output shaft.
Detailed Description
Referring to fig. 1, the transmission system of an electric vehicle according to the first embodiment includes a first lock-up clutch 1, a first electric machine 2, a first shaft 3, a sun gear 7, a planetary gear 10, a large ring gear 8, a carrier 11, an output shaft 12, a second electric machine 4, an inter-shaft clutch 5, a second shaft 6, and a second lock-up clutch 9.
The first electric machine 2 has a first shaft 3, and one end of the first shaft 3 is connected to the sun gear 7, and the other end of the first shaft 3 is connected to the first lock clutch 1. For example, the first electric machine 2 may be coaxially connected with the first shaft 3, and both ends of the first shaft 3 are connected to the first sun gear 7 and the first lock clutch, respectively.
One end of the first lock-up clutch 1 is connected with the housing, the other end of the first lock-up clutch 1 is connected to the first shaft 3, the first lock-up clutch 1 can be opened according to the instruction of the controller so that the first shaft 3 can rotate freely, and the first lock-up clutch 1 can be locked according to the instruction of the controller so that the first shaft 3 and the housing are fixedly connected. For example, the first lock-up clutch 1 may use an electromagnetic jaw clutch, a fixed gear disc of the electromagnetic jaw clutch is fixedly connected with the housing, and a movable gear disc of the electromagnetic jaw clutch is connected with the first shaft 3 and can rotate with the motor; the electromagnetic jaw clutch may be designed to be in a normally disengaged state.
One end of the first shaft 3 is connected with a sun gear 7, the sun gear 7 is meshed with a planetary gear 10, the planetary gear 10 is supported by a carrier 11, and the carrier 11 is connected to an output shaft 12 to output power through the carrier 11.
The second electric machine 4 has a second shaft 6 arranged coaxially with the first shaft 3, and the second shaft 6 is connected with a large ring gear 8.
One end of the second lock-up clutch 9 is connected with the housing, the other end of the second lock-up clutch 9 is connected with the large ring gear 8, the second lock-up clutch 9 can be opened according to the instruction of the controller so that the large ring gear 8 can rotate freely, and the second lock-up clutch 9 can also be locked according to the instruction of the controller so that the large ring gear 8 is fixedly connected with the housing. For example, the second lock-up clutch 9 may use an electromagnetic jaw clutch, a fixed gear disc of the second lock-up clutch 9 is fixedly connected with the housing, and a movable gear disc of the second lock-up clutch 9 is connected with the large gear ring 8 and can rotate with the motor; the electromagnetic jaw clutch can be designed to be in a normally combined state; normally open or normally engaged may be achieved by arranging springs in different positions (not shown).
One end of the inter-shaft clutch 5 is connected to the second shaft 6, the other end of the inter-shaft clutch 5 is connected to the first shaft 3, and the inter-shaft clutch 5 can rigidly connect the second shaft 6 to the first shaft 3 according to a command of the controller. For example, the inter-shaft clutch 5 may be an electromagnetic jaw clutch, a movable gear plate of the electromagnetic jaw clutch is rigidly connected to the second shaft 6 and can rotate with the second shaft 6, and a fixed gear plate of the electromagnetic jaw clutch is rigidly connected to the first shaft 3; and can rotate with the first shaft 3; the electromagnetic dog clutch may be designed to be in a normally off state.
The dual motor drive system according to the present disclosure further includes a controller, which may be configured to:
in response to the electric vehicle speed demand being less than a first vehicle speed threshold (e.g., the first vehicle speed threshold may be 20 km/h) and the driver power demand being less than a first power threshold (e.g., the first power threshold may be 40 kw), for example, the following mode is initiated when the electric vehicle is on a more congested road, or in urban conditions. The controller may command the second lock-up clutch 9 to engage to lock up the large ring gear 8, command the first lock-up clutch 1 to disengage and command the inter-axle clutch 5 to disengage, and may enable the first electrical machine 2, disable the second electrical machine 4, so that the output power of the first electrical machine 2 is transmitted through the sun gear 7, the planet gears 10, the large ring gear 8 and the planet carrier 11 to the output shaft 12, thereby transmitting the power of the first electrical machine 2 to the drive axle or wheels.
In response to the electric vehicle speed demand being greater than the first vehicle speed threshold and less than the second vehicle speed threshold (e.g., the second vehicle speed threshold may be 40 km/h), the driver demand being greater than the first power threshold and less than the second power threshold (e.g., the second power threshold may be 60 kw), the controller may command the second lock-up clutch 9 to disengage, the first lock-up clutch 1 to engage, and the inter-axle clutch 5 to disengage, while the second electric machine 4 is enabled, the first electric machine 2 is disabled, such that the output power of the second electric machine 4 is transmitted to the output shaft 12 through the large ring gear 8, the planetary gears 10, the sun gear 7, and the carrier 11, thereby transmitting the power of the second electric machine 4 to the transaxle or the drive wheels.
In response to the electric vehicle speed demand being greater than the first vehicle speed threshold and less than the second vehicle speed threshold and the driver demand being greater than the second power threshold, the controller may command the second lock-up clutch 9 to be disengaged, the first lock-up clutch 1 to be disengaged and the inter-axle clutch 5 to be disengaged, while also enabling the second electric machine 4 and the first electric machine 2 to transmit the output power of the second electric machine 4 through the large ring gear 8 and the planetary gears 10 and to transmit the output power of the first electric machine 2 through the sun gear 7 and the planetary gears 10 to be coupled and then jointly transmitted to the planet carrier 11 and then to the output shaft 12 through the planet carrier 11, so as to couple and transmit the power of the second electric machine 4 and the first electric machine 2 to the drive axle or the drive wheel; in addition, the transmission system of the electric vehicle according to the embodiment can also realize the power uninterrupted stepless speed change, in particular to realize the stepless speed change of the rotating speed of the output end by controlling the rotating speeds of the first motor 2 and the second motor 4 and through the rotating speed coupling of the planetary gear,
in response to the electric vehicle speed demand being greater than the second vehicle speed threshold, the controller commands the second lock-up clutch 9 to be disengaged, commands the first lock-up clutch 1 to be disengaged and commands the inter-axle clutch 5 to be engaged, and simultaneously activates the second electric machine 4 and the first electric machine 2, so that the output power of the second electric machine 4 and the output power of the first electric machine 2 are output in series through the planetary gear set, are transmitted to the planet carrier 11 together and are transmitted to the output shaft 12 through the planet carrier 11, and then the power of the second electric machine 4 and the power of the first electric machine 2 are transmitted to a drive axle or a drive wheel after being coupled.
At least two of the second lock-up clutch 9, the first lock-up clutch 1 and the inter-axle clutch 5 are commanded to engage in response to an electric vehicle parking (P range) demand to lock up the dual motor transmission.
Fig. 2 shows a transmission system of an electric vehicle according to a second embodiment. The transmission system of the electric vehicle according to the second embodiment is different from the transmission system of the electric vehicle according to the first embodiment in that: the second motor 4 is directly driven and connected to the output shaft 12, so that the stress of the planetary gear set under the direct-drive working condition can be effectively reduced, the service life of the transmission system is prolonged, and the reliability is higher.
The other descriptions are similar to those of the electric vehicle transmission system according to the first embodiment described above, and a sufficient description is omitted here.

Claims (10)

1. A dual motor drive system for an electric vehicle, characterized in that it comprises a first lock-up clutch (1), a first electric machine (2), a first shaft (3), a second electric machine (4), an inter-shaft clutch (5), a second shaft (6), a second lock-up clutch (9) and an output shaft (12) as well as a planetary gear assembly comprising a planetary gear (10), a planet carrier (11), a sun gear (7) and a large ring gear (8);
the first motor (2) is in driving connection with a first shaft (3), one end of the first shaft (3) is connected with a sun gear (7) so as to transmit the driving force of the first motor (2) to the sun gear (7), the other end of the first shaft (3) is connected with a first locking clutch (1), and the first locking clutch (1) is also fixedly connected to a shell so as to selectively lock the first shaft (3) through the first locking clutch (1);
the sun gear (7) is in mesh with planet gears (10), the planet gears (10) are supported by the planet carrier (11), and the planet carrier (11) is connected to the output shaft (12) to output power through the planet carrier (11);
the second electric machine (4) is in driving connection with a second shaft (6), the second shaft (6) is arranged coaxially with the first shaft (3) and is also connected to a large gear ring (8), and the large gear ring (8) is meshed with a planetary gear (10);
one end of the second locking clutch (9) is connected with the shell, and the other end of the second locking clutch (9) is connected with the large gear ring (8) so as to selectively and fixedly connect the large gear ring (8) to the shell through the second locking clutch (9);
one side of the inter-shaft clutch (5) is connected with the second shaft (6), the other side of the inter-shaft clutch (5) is connected with the first shaft (3), and the second shaft (6) is rigidly connected with the first shaft (3) through the inter-shaft clutch (5);
the transmission system further includes a controller configured to:
in response to the electric vehicle speed demand being less than a first vehicle speed threshold and the driver power demand being less than a first power threshold, commanding the second lock-up clutch (9) to engage the big ring gear (8), commanding the first lock-up clutch (1) to disengage, commanding the inter-axle clutch (5) to disengage, enabling the first electric machine (2), disabling the second electric machine (4) to cause the output power of the first electric machine (2) to be transmitted through the sun gear (7), the planet gears (10), the big ring gear (8) and the planet carrier (11) to the output shaft (12) to cause the power of the first electric machine (2) to be transmitted to the drive axle or wheel;
in response to an electric vehicle speed demand being greater than a first vehicle speed threshold and less than a second vehicle speed threshold, a driver demand being greater than a first power threshold and less than a second power threshold, commanding the second lock-up clutch (9) to disengage, commanding the first lock-up clutch (1) to engage, commanding the inter-axle clutch (5) to disengage, activating the second electric machine (4), deactivating the first electric machine (2) so that the output power of the second electric machine (4) is transmitted to an output shaft (12) through the large ring gear (8), the planet gears (10), the sun gear (7), and the planet carrier (11), thereby transmitting the power of the second electric machine (4) to a drive axle or a drive wheel;
in response to the electric vehicle speed demand being greater than a first vehicle speed threshold and less than a second vehicle speed threshold and the driver demand being greater than a second power threshold, commanding the second lock-up clutch (9) to be disengaged, commanding the first lock-up clutch (1) to be disengaged, commanding the inter-axle clutch (5) to be disengaged, activating the second electric machine (4) and the first electric machine (2) so that the output power of the second electric machine (4) and the output power of the first electric machine (2) are coupled and output through the large ring gear (8), the planet gear (10) and the sun gear (7), jointly transmitted to the planet carrier (11), and transmitting power to an output shaft (12) by the planet carrier (11), so that the power of the second electric machine (4) and the first electric machine (2) is transmitted to a drive axle or a drive wheel after being coupled;
in response to the electric vehicle speed demand being greater than a second vehicle speed threshold, commanding the second lock-up clutch (9) to be disconnected, commanding the first lock-up clutch (1) to be disconnected, commanding the inter-axle clutch (5) to be combined, activating the second motor (4) and the first motor (2) so that the output power of the second motor (4) and the output power of the first motor (2) are output in series through a planetary gear set, are jointly transmitted to the planet carrier (11) and are transmitted to an output shaft (12) through the planet carrier (11), and then the power of the second motor (4) and the power of the first motor (2) are transmitted to a drive axle or a drive wheel after being coupled;
commanding engagement of at least two of the second lock-up clutch (9), first lock-up clutch (1), and inter-axle clutch (5) to lock-up the dual-motor drive train in response to an electric vehicle parking request.
2. The dual-motor drive system for electric vehicles according to claim 1, characterized in that the first electric motor (2) and the second electric motor (2) are arranged on the same side of a planetary gear assembly.
3. The dual motor drive system for an electric vehicle according to claim 1, characterized in that the first motor (2) and the second motor (4) are arranged on both sides of a planetary gear assembly.
4. Two-motor drive system for electric vehicles according to claim 1, characterized in that the power of the second electric machine (4) is greater than the power of the first electric machine (2).
5. The dual-motor drive system for an electric vehicle according to claim 1, characterized in that the second lock-up clutch (9), the first lock-up clutch (1) and the inter-shaft clutch (5) are all electromagnetic dog clutches.
6. The dual-motor transmission system for an electric vehicle according to claim 1, characterized in that the first motor (2) is coaxially connected with the first shaft (3), and both ends of the first shaft (3) are connected to the first sun gear (7) and the first lock clutch (1), respectively.
7. The dual-motor drive system for electric vehicles according to claim 1, characterized in that the second electric motor (4) is directly drive-connected to the output shaft (12).
8. The dual-motor transmission system for electric vehicles according to claim 1, characterized in that the first locking clutch (1) is an electromagnetic jaw clutch, the fixed toothed disc of which is fixedly connected with the housing and the movable toothed disc of which is connected with the first shaft (3) and can rotate with the motor; the electromagnetic jaw clutch is set to be in a normally-disengaged state.
9. The dual-motor transmission system for the electric vehicle as claimed in claim 1, wherein the second lock-up clutch (9) is an electromagnetic jaw clutch, a fixed gear disc of the second lock-up clutch (9) is fixedly connected with the housing, and a movable gear disc of the second lock-up clutch (9) is connected with the large gear ring (8) and can rotate with the motor; the electromagnetic jaw clutch is set to a normally engaged state.
10. The dual-motor transmission system for electric vehicles according to claim 1, characterized in that the inter-shaft clutch (5) is an electromagnetic dog clutch, the movable toothed disc of which is rigidly connected to the second shaft (6) and can rotate with the second shaft (6), and the fixed toothed disc of which is rigidly connected to the first shaft (3); and can rotate with the first shaft (3); the electromagnetic jaw clutch is set to a normally open state.
CN202110116478.0A 2021-01-28 2021-01-28 Dual motor drive system for electric vehicle Withdrawn CN112549940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110116478.0A CN112549940A (en) 2021-01-28 2021-01-28 Dual motor drive system for electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110116478.0A CN112549940A (en) 2021-01-28 2021-01-28 Dual motor drive system for electric vehicle

Publications (1)

Publication Number Publication Date
CN112549940A true CN112549940A (en) 2021-03-26

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Application Number Title Priority Date Filing Date
CN202110116478.0A Withdrawn CN112549940A (en) 2021-01-28 2021-01-28 Dual motor drive system for electric vehicle

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113175505A (en) * 2021-04-10 2021-07-27 崔小雷 Pure electric driving device
CN113400913A (en) * 2021-08-03 2021-09-17 长安大学 Electric drive axle structure with double motors and working method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113175505A (en) * 2021-04-10 2021-07-27 崔小雷 Pure electric driving device
CN113400913A (en) * 2021-08-03 2021-09-17 长安大学 Electric drive axle structure with double motors and working method thereof

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Application publication date: 20210326