CN218228613U

CN218228613U - Torque vector electric driving device and electric vehicle

Info

Publication number: CN218228613U
Application number: CN202222619212.0U
Authority: CN
Inventors: 王敷玟; 曾凡沂; 廖展图
Original assignee: GAC Aion New Energy Automobile Co Ltd
Current assignee: GAC Aion New Energy Automobile Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-01-06
Anticipated expiration: 2032-09-29

Abstract

The embodiment of the application provides a torque vector electric driving device and an electric vehicle, and relates to the technical field of automobiles. The driving motor of the torque vector electric driving device is arranged on the shell; the assembly controller is connected with a driving motor, and the driving motor, the transmission mechanism, the clutch and the differential are sequentially in transmission connection; the hydraulic mechanism comprises an electronic oil pump, a two-way valve, a first electromagnetic valve, a second electromagnetic valve, a first hydraulic cylinder and a second hydraulic cylinder, an assembly controller is respectively connected with the electronic oil pump, the two-way valve, the first electromagnetic valve and the second electromagnetic valve, the electronic oil pump is connected with the two-way valve, the two-way valve is respectively connected with a driving motor, the first electromagnetic valve and the second electromagnetic valve, the first electromagnetic valve is communicated with the first hydraulic cylinder, the second electromagnetic valve is communicated with the second hydraulic cylinder, and the first hydraulic cylinder and the second hydraulic cylinder are respectively arranged on two sides of the clutch. The torque vectoring electric drive may achieve the technical effects of improving fuel economy and vehicle transient response performance.

Description

Torque vector electric driving device and electric vehicle

Technical Field

The application relates to the technical field of automobiles, in particular to a torque vector electric driving device and an electric vehicle.

Background

At present, in order to enable a vehicle to have good operation performance, a double-motor system is generally adopted in an existing new energy automobile so as to realize independent control of torque of left and right rear wheels. The fuel oil vehicle is driven by a design of a disconnectable power takeoff, an intermediate transmission shaft, a rear main reducer and the like to shunt the power of an engine to a rear axle, and then a multi-plate clutch is designed through a rear axle assembly to realize torque vector control. Or, in the existing Vehicle torque vectoring Control, the left and right torque distribution schemes are calculated by a Vehicle Control Unit (VCU), a Controller Area Network (CAN) is used to communicate and enable target torques of the dual motors, and the motors are controlled by the motors to execute the torques to realize torque vectoring Control.

In the prior art, double motors are adopted to realize torque vectors, the problem of Electromagnetic Compatibility (EMC) is outstanding, and parts are more, so that a vehicle is heavy and high in cost; the realization of the torque of the rear axle of the product depends on the power transmission of a front axle power takeoff assembly, the transmittable torque is large, the output capacity of the rear axle is limited, the performance of the torque vector is general, and the structure is provided with a differential mechanism, two planet rows and a multi-disc clutch hydraulic system with limited space; and too much CAN communication transmission is unfavorable for transient response timeliness under the limit working condition.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a torque vectoring electric drive device and an electric vehicle, which can achieve the technical effects of improving fuel economy and vehicle transient response performance.

In a first aspect, embodiments of the present application provide a torque vectoring electric drive comprising a housing, an assembly controller, a drive motor, a transmission, a hydraulic mechanism, a clutch, and a differential;

the driving motor is arranged on the shell;

the assembly controller is connected with the driving motor, and the driving motor, the transmission mechanism, the clutch and the differential are sequentially in transmission connection;

the hydraulic mechanism comprises an electronic oil pump, a two-way valve, a first electromagnetic valve, a second electromagnetic valve, a first hydraulic cylinder and a second hydraulic cylinder, the assembly controller is respectively connected with the electronic oil pump, the two-way valve, the first electromagnetic valve and the second electromagnetic valve, the electronic oil pump is connected with the two-way valve, the two-way valve is respectively connected with the driving motor, the first electromagnetic valve and the second electromagnetic valve, the first electromagnetic valve is communicated with the first hydraulic cylinder, the second electromagnetic valve is communicated with the second hydraulic cylinder, and the first hydraulic cylinder and the second hydraulic cylinder are respectively arranged on two sides of the clutch.

In the implementation process, through the coupling design of the hydraulic mechanism, the hydraulic system of the clutch is coupled with the cooling and lubricating system of the driving motor through the two-way valve, so that the cooling and lubricating of the hydraulic system can be realized, the torque of the left and right wheels of the rear axle can be independently controlled, the torque vector control is realized, the operation stability and the cross-country trafficability of the vehicle are improved, and meanwhile, the system multi-plate clutch is disconnected, so that the better fuel economy can be realized; the torque vector calculation hydraulic system driving control module is integrated through the assembly controller, so that the quick response of torque can be realized, an independent torque vector control unit is not needed, the integration is high, and the transient response performance of the vehicle can be obviously improved; thus, the torque vectoring electric drive may achieve the technical effects of improving fuel economy and vehicle transient response performance.

Furthermore, the device also comprises an electric control signal transmission line, and the assembly controller is respectively connected with the electronic oil pump, the two-way valve, the first electromagnetic valve and the second electromagnetic valve through the electric control signal transmission line.

In the implementation process, the assembly controller, the electronic oil pump, the two-way valve, the first electromagnetic valve and the second electromagnetic valve are electrically connected through the electric control signal transmission line; therefore, on one hand, the assembly controller is used as a motor controller to be connected with the driving motor and can control the operation of the driving motor; on the other hand, the assembly controller realizes the drive control of the torque vector calculation hydraulic system, and realizes the integration of the motor controller and the torque vector calculation hydraulic system drive control module.

Further, drive mechanism includes one-level driving gear and one-level driven gear, driving motor includes electric motor rotor, electric motor rotor with one-level driving gear transmission is connected, the one-level driving gear with one-level driven gear transmission is connected.

Further, drive mechanism still includes secondary gear axle, secondary driving gear and secondary driven gear, one-level driven gear with the transmission of secondary gear axle is connected, the secondary driving gear with the transmission of secondary driven gear is connected, the secondary gear axle with secondary driving gear fixed mounting.

Further, the clutch comprises a spline drum, a first pair of even steel sheets and a second pair of even steel sheets, the secondary driven gear is fixedly installed on the spline drum, the first pair of even steel sheets and the second pair of even steel sheets are installed on two sides of the spline drum respectively, and the first pair of even steel sheets and the second pair of even steel sheets rotate synchronously.

In the implementation process, the interior of the driven gear is connected with a spline drum of the clutch through laser welding; the left side and the right side of the spline drum are respectively provided with a first dual steel sheet and a second dual steel sheet, and synchronous rotation is realized through connection of an inner spline and an outer spline of the spline drum.

Further, the clutch still includes first clutch disc and second clutch disc, first clutch disc set up in first even steel sheet, the second clutch disc set up in the second even steel sheet, first clutch disc with the cooperation of first even steel sheet forms first packing force, the second clutch disc with the cooperation of second even steel sheet forms second packing force.

In the implementation process, the first paired steel sheets and the second paired steel sheets are arranged in a paired mode to form pressing force by matching the paired steel sheets with the clutch plates, and the first pressing force and the second pressing force are independent and can be set independently.

Further, the differential mechanism comprises a first output end and a second output end, the first output end is matched with the first pressing force to form a first positive pressure through the first hydraulic cylinder, and the second output end is matched with the second pressing force to form a second positive pressure through the second hydraulic cylinder.

Further, the device also comprises an oil filter, and the oil filter is respectively connected with the electronic oil pump and the two-way valve.

Furthermore, the device also comprises a clutch system hydraulic pipeline and a cooling system hydraulic pipeline, the hydraulic mechanism is internally connected with the cooling system hydraulic pipeline through the clutch system hydraulic pipeline, and the two-way valve is connected with the driving motor through the cooling system hydraulic pipeline.

In a second aspect, embodiments of the present application provide an electric vehicle comprising a torque vectoring electric drive according to any of the first aspect.

Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the above-described techniques.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a torque vectoring electric drive provided in accordance with an embodiment of the present application;

fig. 2 is a schematic diagram of a linear two-degree-of-freedom automobile model provided in an embodiment of the present application.

Icon: a housing 1; an assembly controller 2; an electric control signal transmission line 3; a drive motor 4; a motor rotor 5; a primary driving gear 6; a primary driven gear 7; a secondary gear shaft 8; a secondary driving gear 9; a secondary driven gear 10; a spline drum 11; an electronic oil pump 12; an oil filter 13; a two-way valve 14; a first electromagnetic valve 15; a clutch system hydraulic line 16; a cooling system hydraulic line 17; a second electromagnetic valve 18; a first output terminal 19; a first mating steel piece 20; a first hydraulic cylinder 21; the first clutch plate 22; a second output 23; a second pair of even steel pieces 24; a second hydraulic cylinder 25; a second clutch plate 26; a first drive shaft 27; a second drive shaft 28; a first drive wheel 29; a second drive wheel 30.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or a point connection; either directly or indirectly through intervening media, or may be an internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

The embodiment of the application provides a torque vector electric driving device and an electric vehicle, which can be applied to torque control of a motor system; the torque vector electric driving device couples a hydraulic system of a clutch with a cooling and lubricating system of a driving motor through a two-way valve through the coupling design of a hydraulic mechanism, so that the cooling and lubricating of the hydraulic system can be realized, the torque of left and right side wheels of a rear axle can be independently controlled, the torque vector control is realized, the operation stability and cross-country trafficability of a vehicle are improved, and better fuel economy can be realized through the disconnection of a system multi-plate clutch; the torque vector calculation hydraulic system driving control module is integrated through the assembly controller, so that the quick response of torque can be realized, an independent torque vector control unit is not needed, the integration is high, and the transient response performance of the vehicle can be obviously improved; thus, the torque vectoring electric drive may achieve the technical effects of improving fuel economy and vehicle transient response performance.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a torque vectoring electric drive according to an embodiment of the present disclosure, which includes a housing 1, an assembly controller 2, a driving motor 4, a transmission mechanism, a hydraulic mechanism, a clutch, and a differential.

Illustratively, the drive motor 4 is mounted to the housing 1.

Illustratively, the housing 1 serves as an electric drive system housing, and the drive motor 4 is mounted inside the housing 1.

Illustratively, the assembly controller 2 is connected with a driving motor 4, and the driving motor 4, a transmission mechanism, a clutch and a differential are sequentially in transmission connection.

Illustratively, the assembly controller 2 is used as a motor controller, and is connected with the driving motor 4, and can control the operation of the driving motor 4; meanwhile, the driving motor 4, the transmission mechanism, the clutch and the differential are sequentially in transmission connection, power generated by the driving motor 4 is sequentially transmitted by the transmission mechanism, the clutch and the differential, and finally transmitted to the driving wheel by the differential.

Illustratively, the hydraulic mechanism includes an electronic oil pump 12, a two-way valve 14, a first electromagnetic valve 15, a second electromagnetic valve 18, a first hydraulic cylinder 21 and a second hydraulic cylinder 25, the assembly controller 2 is respectively connected with the electronic oil pump 12, the two-way valve 14, the first electromagnetic valve 15 and the second electromagnetic valve 18, the electronic oil pump 12 is connected with the two-way valve 14, the two-way valve 14 is respectively connected with the driving motor 4, the first electromagnetic valve 15 and the second electromagnetic valve 18, the first electromagnetic valve 15 is communicated with the first hydraulic cylinder 21, the second electromagnetic valve 18 is communicated with the second hydraulic cylinder 25, and the first hydraulic cylinder 21 and the second hydraulic cylinder 25 are respectively arranged on two sides of the clutch.

Illustratively, the first hydraulic cylinder 21 and the second hydraulic cylinder 25 are respectively disposed on both sides of the clutch; in some embodiments, the left-side clutch plate pressing force and the right-side clutch plate pressing force of the clutch are pressurized by the first hydraulic cylinder 21 and the second hydraulic cylinder 25 respectively to form a positive pressure, and the magnitude of the positive pressure represents the torque transmission capacity of the system.

Illustratively, the two-way valve 14 is respectively connected with the driving motor 4, the first electromagnetic valve 15 and the second electromagnetic valve 18, wherein the first electromagnetic valve 15 and the second electromagnetic valve 18 are communicated with the hydraulic system of the clutch, so that the hydraulic system of the clutch is coupled with the cooling and lubricating system of the driving motor 4 through the two-way valve 14; therefore, cooling and lubrication of a hydraulic system can be realized, torque of left and right side wheels of a rear axle can be independently controlled, torque vector control is realized, vehicle operation stability and cross-country trafficability are improved, and better fuel economy can be realized by disconnecting a system multi-plate clutch.

In some embodiments, the operations of the electronic oil pump 12, the two-way valve 14, the first solenoid valve 15, the second solenoid valve 18, and the driving motor 4 are driven and controlled by the assembly controller 2.

The torque vectoring electric drive further comprises an electric control signal transmission line 3, and the assembly controller 2 is connected with the electric oil pump 12, the two-way valve 14, the first solenoid valve 15 and the second solenoid valve 18 through the electric control signal transmission line 3.

Illustratively, the electrical connection among the assembly controller 2, the electronic oil pump 12, the two-way valve 14, the first solenoid valve 15 and the second solenoid valve 18 is realized through an electrical control signal transmission line 3; therefore, on one hand, the assembly controller 2 is used as a motor controller to be connected with the driving motor 4, and can control the operation of the driving motor 4; on the other hand, the assembly controller 2 realizes the drive control of the torque vector calculation hydraulic system at any moment, and realizes the integration of the motor controller and the torque vector calculation hydraulic system drive control module.

Exemplarily, the drive mechanism includes one-level driving gear 6 and one-level driven gear 7, and driving motor 4 includes electric motor rotor 5, and electric motor rotor 5 is connected with one-level driving gear 6 transmission, and one-level driving gear 6 and one-level driven gear 7 transmission are connected.

Exemplarily, the transmission mechanism further comprises a secondary gear shaft 8, a secondary driving gear 9 and a secondary driven gear 10, the primary driven gear 7 is in transmission connection with the secondary gear shaft 8, the secondary driving gear 9 is in transmission connection with the secondary driven gear 10, and the secondary gear shaft 8 and the secondary driving gear 9 are fixedly installed.

Exemplarily, the clutch comprises a spline drum 11, a first pair of even steel sheets 20 and a second pair of even steel sheets 24, the secondary driven gear 10 is fixedly installed with the spline drum 11, the first pair of even steel sheets 20 and the second pair of even steel sheets 24 are respectively installed on two sides of the spline drum 11, and the first pair of even steel sheets 20 and the second pair of even steel sheets 24 synchronously rotate.

Illustratively, the inside of the driven gear 10 is connected with the spline drum 11 of the clutch by laser welding; the left side and the right side of the spline drum 11 are respectively provided with a first pair of even steel sheets 20 and a second pair of even steel sheets 24, and synchronous rotation is realized through the connection of an inner spline and an outer spline of the spline drum 11.

Illustratively, the clutch further comprises a first clutch plate 22 and a second clutch plate 26, the first clutch plate 22 is arranged on the first pair of even steel plates 20, the second clutch plate 26 is arranged on the second pair of even steel plates 24, the first clutch plate 22 and the first pair of even steel plates 20 cooperate to form a first pressing force, and the second clutch plate 26 and the second pair of even steel plates 24 cooperate to form a second pressing force.

Illustratively, the first pair of steel sheets 20 and the second pair of steel sheets 24 are arranged in a pair manner on the first clutch plate 22 and the second clutch plate 26, so that the pair of steel sheets and the clutch plates are matched to form pressing force, and the first pressing force and the second pressing force are independent and can be independently arranged.

Illustratively, the differential includes a first output 19 and a second output 23, the first output 19 cooperating with a first pressing force to create a first positive pressure by the first hydraulic cylinder 21, and the second output 23 cooperating with a second pressing force to create a second positive pressure by the second hydraulic cylinder 25.

In some embodiments, the first clutch plate 22 and the second clutch plate 26 are respectively connected with the first output end 19 and the second output end 23 of the differential through the internal and external splines of the spline drum 11, the pressing force of the first clutch plate 22 and the pressing force of the second clutch plate 26 are respectively pressurized through the first hydraulic cylinder 21 and the second hydraulic cylinder 25 to form a positive pressure, the magnitude of the positive pressure reflects the capacity of the system for transmitting torque, and finally, independent power is respectively transmitted to the first driving wheel 29 and the second driving wheel 30 through the first driving shaft 27 and the second driving shaft 28.

The torque vectoring electric drive further comprises an oil filter 13, and the oil filter 13 is connected with the electronic oil pump 12 and the two-way valve 14 respectively.

Illustratively, the oil filter 13 is installed on the electronic oil pump 12 and the pipeline of the two-way valve 14, and can remove large solid impurities in the fluid, so that the torque vector electric driving device can normally work and operate, thereby achieving the effects of stabilizing the process and ensuring the safety.

The torque vectoring electric drive further comprises, for example, a clutch system hydraulic line 16 and a cooling system hydraulic line 17, the hydraulic machine being connected via the clutch system hydraulic line 16, and the two-way valve 14 being connected to the drive motor 4 via the cooling system hydraulic line 17.

Illustratively, to the problems in the prior art, the embodiment of the present application provides a torque vectoring electric drive device, which can realize a high-performance torque vectoring electric drive system, and through a hydraulic system coupling design, a torque multi-disc clutch hydraulic system is coupled with an electric drive system cooling and lubricating system, so that cooling and lubricating of the hydraulic system can be realized, independent control of the torque of left and right side wheels of a rear axle can be realized, torque vectoring control is realized, vehicle operation stability and cross-country trafficability are improved, and better fuel economy can be realized by disconnecting a system multi-disc clutch. The driving control module of the torque vector calculation hydraulic system is integrated into the motor controller, so that the quick response of torque can be realized, an independent torque vector control unit is not needed, the high integration is realized, and the transient response performance of a vehicle can be obviously improved.

For example, the torque vectoring electric driving device provided by the embodiment of the application can eliminate a conventional differential mechanism through the design of the left and right hydraulic multi-plate clutches at the second-stage driven gear end of the speed reducer, and can realize torque vectoring control under the drive of a single motor through the independent control of the left and right hydraulic systems; the clutch hydraulic control system and the electric drive system can be coupled through the two-way valve design; the torque vector calculation unit, the electronic oil pump control, the two-way valve control and the hydraulic electromagnetic valve are integrated into an assembly control system, so that the high-efficiency integrated control of the electric drive system can be realized.

In some implementation scenarios, when the electric vehicle runs in a straight line with four wheels in a normal manner, in order to meet the requirements of power performance and fuel economy, and when the vehicle control unit needs to output a rear axle torque according to a command without pursuing vehicle dynamic performance, the assembly controller 2 controls the combination of the first clutch plate 22 and the second clutch plate 26, and the rear axle assists in driving, specifically: when the assembly controller 2 receives a torque mode command (VCU _ ICU _ mode = = Trq mode) of the vehicle control unit, the driving motor 4 enters a torque mode, the assembly controller 2 opens the two-way valve 14, simultaneously opens the first electromagnetic valve 15 and the second electromagnetic valve 18, the hydraulic cylinder presses the clutch plates, when the hydraulic cylinder reaches a certain pressure, the two-way valve 14 and the electromagnetic valves are closed, the hydraulic system enters a pressure maintaining state, and the rear wheel left side driving force (Trr) and the rear wheel right side driving force (Trl) are respectively controlled by the following components: trr = Trl = VCU _ ICU _ Trq/2.

In some implementation scenarios, when the electric vehicle is running in a conventional four-wheel turn, i.e. in a four-wheel drive state, and when the vehicle dynamic performance is not required, the assembly controller 2 controls the first clutch plate 22 and the second clutch plate 26 to correct the pressure value according to the steering wheel angle, and the motor is driven in a low-torque auxiliary mode, specifically: the assembly controller 2 receives a torque mode command (VCU _ ICU _ mode = Trq mode) of the vehicle controller, the driving motor 4 enters a torque mode, the assembly controller 2 opens the two-way valve 14, simultaneously opens the first electromagnetic valve 15, the second electromagnetic valve 18, the first hydraulic cylinder 21 and the second hydraulic cylinder 25, and presses a clutch disc by the hydraulic cylinders, when the hydraulic cylinders reach a preset pressure, the two-way valve 14 and the electromagnetic valves are closed, the hydraulic system enters a pressure maintaining state, the vehicle power vehicle is normally driven, the preset pressure is corrected according to the turning angle of a steering wheel of the vehicle, the vehicle speed and the like, after calibration, the clutch disc can normally slide and rub, and the phenomenon of steering interference between wheels cannot occur.

Referring to fig. 2, fig. 2 is a schematic view of a linear two-degree-of-freedom automobile model according to an embodiment of the present application.

In some implementation scenarios, the electric vehicle is in motion tracking torque vector control mode and turns left: when the vehicle needs better dynamic performance of the operation stability, in order to improve the steering characteristic of the vehicle, the torque vector distribution can be realized by independently controlling the left and right torques of the rear axle before the response of a vehicle body stability system according to a preset control strategy, the vehicle state is corrected, and the operation stability is improved.

Illustratively, to illustrate the performance of the system, a 2-degree-of-freedom automobile model yaw-rate follow-up control is taken as an example (see fig. 2), a required vehicle yaw-moment demand is calculated, and the yaw-moment control is realized by a torque vector. Establishing an automobile two-degree-of-freedom model:

considering the limit of the road adhesion coefficient, the centroid slip angle and the yaw rate of the road adhesion coefficient need to meet the following constraint conditions:

in the above formula, k ₁ 、k ₂ Is the tire side deflection stiffness of the front and rear wheels, mu is the road surface adhesion coefficient, w _rd At nominal yaw rate, beta _d Is the nominal centroid slip angle.

When calculating the required yaw moment, calculating the yaw moment by adopting a vehicle yaw velocity tracking control method, and determining performance indexes:

wherein w is the actual yaw rate, wrd is the target yaw rate, w is the weight coefficient, and Mz is the target yaw moment. To minimize J, calculate yaw rate, there are:

Mz＝Frl*r*b-Frr*r*b (9)；

VCU_ICU_Trq＝Frl+Frr (10)；

from the formulas (9) and (10), when the VCU _ ICU _ Trq requires a certain torque, the assembly controller 2 calculates the torque distribution of Frl and Frr respectively according to the minimum performance index J, and then controls the opening of the two-way valve 14 and the electromagnetic valve through the assembly controller 2 according to the power required to be transmitted, so as to control the pressing force of the hydraulic cylinder, thereby controlling the torque transmission on the left and right sides, and improving the dynamic characteristics of the vehicle. The method comprises the following specific steps: the assembly controller 2 calculates a left wheel torque Mrl and a right wheel torque Mrr of a rear axle according to VCU _ ICU _ Trq and Mz required by calculation, then calculates the opening amount of the two-way valve 14 at the current rotating speed of the electronic oil pump 12 according to the torque required to be transmitted, controls the two-way valve 14 to be opened, calculates the opening degrees of the first electromagnetic valve 15 and the second electromagnetic valve 18 to control the electromagnetic valves to be opened, and when the hydraulic cylinders on two sides reach a preset pressure, the two-way valve 14 is closed, the electromagnetic valves are closed, the hydraulic system enters a pressure maintaining state, and the system reliably transmits the torque.

In some implementation scenes, similarly, during right steering, the clockwise rotation moment Mz of the whole vehicle with the center of mass as the center is realized through torque vector control, the understeer of the vehicle is improved, and the performance of the vehicle is improved.

In some implementations scenarios, the vehicle slip escape (one-sided slip escape): when the rear axle wheel slips, for example, when the vehicle runs on an open road, the torque vector control system is quickly combined to quickly get rid of the trouble. The left side and the right side of the rear axle are equivalent to rigid connection, and the adhesion force of the rear axle is maximized. Taking the left side at high attachment and the right side at low attachment as an example, when the system detects that the right wheel skids, the clutch plates at the two sides are quickly pressed, at the moment, the left wheel and the right wheel of the rear axle are in rigid connection, the torque output of the rear axle is increased, the system can make full use of the attachment of the left wheel, and the vehicle can be quickly taken off.

In some implementation scenes, when the front axle of the vehicle slips and gets rid of the difficulty, similarly, the vehicle control unit controls to increase the output torque of the rear axle, and realizes the maximum torque output of the rear axle through the torque vector to improve the vehicle getting rid of the difficulty performance.

In some implementation scenarios, when the vehicle speed is high, control may be turned off: according to the optimal economic criterion, the torque output of the rear axle is not needed, and the assembly controller 2 controls the clutch with the left hydraulic multi-plate and the right hydraulic multi-plate to be disconnected at the moment. The method comprises the following specific steps: when the vehicle speed is greater than V, the assembly controller 2 receives a mode command (VCU _ ICU _ mode = = Disconnect) of the vehicle control unit, the assembly controller 2 controls the two-way valve 14 to close hydraulic transmission to the first electromagnetic valve 15 and the second electromagnetic valve 18, the first electromagnetic valve 15 and the second electromagnetic valve 18 are closed, the hydraulic cylinder does not compress the clutch plate, at this time, the clutch plate is separated from the dual steel sheet, the output end of the differential mechanism idles with the drive shaft, the drive motor, the reduction gearbox, the clutch drum, the clutch plate and the like are static, switching loss of the motor is reduced, and accordingly idling loss of the transmission system is reduced.

In summary, the torque vectoring electric drive device provided by the embodiment of the application realizes the vectoring control, the unilateral slip control and the disengageable control functions which are difficult to realize by a conventional electric drive system. The functions are realized by calibrating various roads such as low-attachment roads, high-attachment roads, cross-country roads and the like on the roads with rapid acceleration, single lane changing, double lane changing, high-speed turning, split butt joint climbing and the like.

Illustratively, embodiments of the present application provide an electric vehicle including a torque vectoring electric drive as shown in fig. 1.

In all embodiments of the present application, the terms "large" and "small" are relative terms, and the terms "more" and "less" are relative terms, and the terms "upper" and "lower" are relative terms, and the description of these relative terms is not repeated herein.

It should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present application," or "as an alternative implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in this embodiment," "in the examples of the present application," or "as an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are all alternative embodiments and that the acts and modules involved are not necessarily required for this application.

In various embodiments of the present application, it should be understood that the sequence numbers of the above-mentioned processes do not imply a necessary order of execution, and the order of execution of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A torque vector electric driving device is characterized by comprising a shell, an assembly controller, a driving motor, a transmission mechanism, a hydraulic mechanism, a clutch and a differential mechanism;

the driving motor is arranged on the shell;

2. The torque vectoring electric drive as claimed in claim 1, further comprising an electric control signal transmission line, said assembly controller being connected to said electric oil pump, said two-way valve, said first solenoid valve, said second solenoid valve, respectively, via said electric control signal transmission line.

3. The torque vectoring electric drive as claimed in claim 1, wherein said drive mechanism includes a primary drive gear and a primary driven gear, and said drive motor includes a motor rotor, said motor rotor being in driving communication with said primary drive gear, said primary drive gear being in driving communication with said primary driven gear.

4. The torque vectoring electrical drive as claimed in claim 3 wherein said drive mechanism further comprises a secondary gear shaft, a secondary drive gear and a secondary driven gear, said primary driven gear being drivingly connected to said secondary gear shaft, said secondary drive gear being drivingly connected to said secondary driven gear, said secondary gear shaft being fixedly secured to said secondary drive gear.

5. The torque vectoring electric drive of claim 4 wherein said clutch includes a splined drum, a first pair of laminations, and a second pair of laminations, said secondary driven gear is fixedly mounted to said splined drum, said first pair of laminations and said second pair of laminations are mounted to opposite sides of said splined drum, and said first pair of laminations and said second pair of laminations rotate in unison.

6. The torque vectoring electric drive of claim 5 wherein said clutch further comprises a first clutch plate disposed on said first pair of clutch plates and a second clutch plate disposed on said second pair of clutch plates, said first clutch plate cooperating with said first pair of clutch plates to form a first compressive force and said second clutch plate cooperating with said second pair of clutch plates to form a second compressive force.

7. The torque vectoring electric drive of claim 6 wherein said differential includes a first output and a second output, said first output engaging said first compressive force to create a first positive pressure force by said first hydraulic cylinder and said second output engaging said second compressive force to create a second positive pressure force by said second hydraulic cylinder.

8. The torque vectoring electric drive as claimed in claim 1, further comprising an oil filter connected to said electric oil pump and said two way valve respectively.

9. The torque vectoring electric drive as claimed in claim 8, further comprising a clutch system hydraulic line and a cooling system hydraulic line, said hydraulic mechanism being connected via said clutch system hydraulic line, said two way valve being connected to said drive motor via said cooling system hydraulic line.

10. An electric vehicle comprising a torque vectoring electric drive as claimed in any one of claims 1 to 9.