Powertrain of a hybrid vehicle

Abstract

Powertrain of a hybrid vehicle, comprising: a planetary gear set (PG) comprising three rotating elements, one of which is connected to an internal combustion engine (E) and another of which is connected to a front drive shaft (A1); a first motor unit (MG1) which is connected to the remaining rotating element of the three rotating elements; a second motor unit (MG2) which is connected to a rear drive shaft (A2) and supplies power to the rear drive shaft (A2); a first clutch (CL1) which is arranged between the rotating element of the planetary gear set (PG) connected to the first motor unit (MG1) and the rotating element of the planetary gear set (PG) connected to the internal combustion engine (E); a second clutch (CL2) arranged between the front drive shaft (A1) and the rotating element of the planetary gear set (PG) connected to the front drive shaft (A1); and a brake (B) that selectively limits the rotational element of the planetary gear set (PG) connected to the first motor unit (MG1), wherein a drive mode changes according to the engagement states of the first clutch (CL1) and the second clutch (CL2), and wherein in a 4th HEV drive mode the first clutch (CL1) is disengaged, the second clutch (CL2) is engaged, the brake (B) is operated, and the internal combustion engine (E) and the second motor unit (MG2) are operated, so that the vehicle is driven via four wheels powered by the internal combustion engine (E) and the second motor unit (MG2).

Description

[0001] The invention relates in general to a powertrain of a hybrid vehicle, and in particular to a powertrain of a hybrid vehicle which can realize different drive modes by a combination of a planetary gear and a clutch.

[0002] Hybrid vehicles, which are powered by efficiently combining two different types of power sources, generally use an internal combustion engine and a motor / generator.

[0003] These hybrid vehicles, which use an internal combustion engine with good torque at high speed and a motor generator with good torque at low speed, are primarily powered by the power of the motor generator for low-speed driving and primarily by the power of the internal combustion engine for high-speed driving.

[0004] Furthermore, hybrid vehicles maintain sufficient drive power with high fuel efficiency while driving under different driving conditions by efficiently combining the power from the combustion engine and the power from the motor generator.

[0005] Hybrid powertrains used in hybrid vehicles are designed to appropriately combine the power of an internal combustion engine and the power of a motor-generator. However, hybrid powertrains require a large number of parts to power a vehicle in different driving modes, such as EV mode and HEV mode, thus increasing manufacturing costs.

[0006] Therefore, there is a need for an efficient powertrain that is suitable for reducing the number of parts in hybrid powertrains and for implementing different drive modes according to the driving conditions of a vehicle.

[0007] The subsequently published DE 10 2013 114 871 A1 describes a drive train of a hybrid vehicle, comprising a planetary gear set having three rotating elements, one of which is connected to an internal combustion engine and another of which is connected to a front drive shaft, a first motor unit connected to the remaining rotating element of the three rotating elements, and a second motor unit connected to a rear drive shaft and supplying power to the rear drive shaft.

[0008] Further powertrains of a hybrid vehicle are known from DE 101 41 923 A1, DE 10 2014 101 733 A1 and US 2008 / 0 026 898 A1.

[0009] The object of the invention is to create a powertrain for a hybrid vehicle that can provide different drive modes for propelling a hybrid vehicle and can enable efficient propulsion according to different propulsion conditions.

[0010] The problem is solved according to the invention by a powertrain of a hybrid vehicle according to the features of claim 1 or 13. Advantageous further developments are described in the dependent claims.

[0011] According to one aspect of the invention, a drive train of a hybrid vehicle comprises a planetary gear set having three rotating elements, one of which is connected to an internal combustion engine and another of which is connected to a front drive shaft, a first motor unit connected to the remaining rotating element of the three rotating elements, and a second motor unit connected to a rear drive shaft and supplying power to the rear drive shaft.

[0012] The planetary gear set can include a sun gear, a planet carrier, and a ring gear.

[0013] The first motor unit can be connected to the sun gear of the planetary gear set, the internal combustion engine can be connected to the planet carrier, and the front drive shaft can be connected to the ring gear.

[0014] The drive train further comprises a first clutch arranged between the rotating element of the planetary gear set connected to the first engine unit and the rotating element of the planetary gear set connected to the internal combustion engine, and a second clutch arranged between the front drive shaft and the rotating element of the planetary gear set connected to the front drive shaft, wherein a drive mode changes according to the engagement states of the first clutch and the second clutch.

[0015] In a 1st EV drive mode, the first clutch can be disengaged, the second clutch can be engaged, and the first motor unit can be operated, allowing the vehicle to be driven via front wheels powered by the first motor unit.

[0016] In a second EV drive mode, the first clutch and the second clutch can be disengaged, and the second motor unit can be operated, allowing the vehicle to be driven via rear wheels powered by the second motor unit.

[0017] In a third EV drive mode, the first clutch can be disengaged, the second clutch can be engaged, and the first motor unit and the second motor unit can be operated, so that the vehicle can be driven via four wheels powered by the first motor unit and the second motor unit.

[0018] In a 1. HEV drive mode, the first clutch can be engaged, the second clutch can be disengaged, and the internal combustion engine can be operated, so that the first motor unit can generate electrical current using power from the internal combustion engine, the second motor unit can be operated, and the vehicle can be driven via rear wheels powered by the power from the second motor unit.

[0019] In a second HEV drive mode, the first clutch can be disengaged, the second clutch can be engaged, and the internal combustion engine and the second motor unit can be operated, allowing the vehicle to be driven via four wheels powered by the internal combustion engine and the second motor unit.

[0020] In the second HEV drive mode, the first motor unit can also be operated according to the vehicle's driving condition, so that power from the first motor unit can be transferred to the front drive shaft together with the power from the combustion engine.

[0021] In a 3rd HEV drive mode, the first clutch and the second clutch can be engaged, and the internal combustion engine and the second motor unit can be operated, so that the vehicle can be driven via four wheels powered by the internal combustion engine and the second motor unit.

[0022] The drivetrain further includes a brake which selectively limits the rotary element of the planetary gear set connected to the first motor unit, wherein in a 4th HEV drive mode the first clutch is disengaged, the second clutch is engaged, the brake is applied, and the internal combustion engine and the second motor unit are operated, so that the vehicle is driven via four wheels powered by the internal combustion engine and the second motor unit.

[0023] An engine coupling can be located between the second engine unit and the rear drive shaft.

[0024] A one-way coupling can be arranged between the internal combustion engine and the planetary gear set.

[0025] According to another aspect of the invention, a drivetrain of a hybrid vehicle comprises a planetary gear set having three rotating elements, one of which is connected to an internal combustion engine and another of which is connected to a front drive shaft, a first motor unit connected to the remaining rotating element of the three rotating elements, a second motor unit connected to a rear drive shaft and supplying power to the rear drive shaft, a first clutch arranged between the rotating element of the planetary gear set connected to the first motor unit and the rotating element of the planetary gear set connected to the internal combustion engine, and a second clutch arranged between the front drive shaft and the rotating element of the planetary gear set connected to the front drive shaft.wherein a drive mode changes according to the engagement states of the first clutch and the second clutch, and wherein in a 3rd EV drive mode the first clutch is disengaged, the second clutch is engaged, and the first motor unit and the second motor unit are operated, so that the vehicle is driven via four wheels powered by the first motor unit and the second motor unit.

[0026] The powertrain of a hybrid vehicle according to the invention can provide different drive modes for propelling a vehicle, so that it is possible for a vehicle to drive efficiently according to different drive conditions.

[0027] In particular, by controlling a planetary gear set and a plurality of clutches, power loss through the drivetrain is minimized in front-wheel or rear-wheel drive, and it is possible to achieve both an EV mode and regenerative braking by using all motors intended for the front and rear wheels, thus ensuring high energy efficiency.

[0028] The invention is explained in more detail with reference to the drawing. The drawing shows: Fig. 1 a schematic diagram of a powertrain of a hybrid vehicle according to an exemplary embodiment of the invention; Fig. 2 a diagram of the drive train according to the exemplary embodiment of the invention in a 1. EV drive mode; Fig. 3 a diagram of the drive train according to the exemplary embodiment of the invention in a 2nd EV drive mode; Fig. 4 a diagram of the drive train according to the exemplary embodiment of the invention in a 3. EV drive mode; Fig. 5 a diagram of the drive train according to the exemplary embodiment of the invention in a 1. HEV drive mode; Fig. 6 a diagram of the drive train according to the exemplary embodiment of the invention in a 2nd HEV drive mode; Fig. 7 a diagram of the drive train according to the exemplary embodiment of the invention in a 3. HEV drive mode; and Fig. 8 a scheme of the drive train according to the exemplary embodiment of the invention in a 4. HEV drive mode.

[0029] As in Fig. As shown in Figure 1, a drive train of a hybrid vehicle according to an exemplary embodiment of the invention comprises a planetary gear set PG, which has three rotating elements, one of which is connected to an internal combustion engine E and another of which is connected to a front drive shaft A1, a first motor unit MG1, which is connected to the remaining rotating element of the planetary gear set PG, and a second motor unit MG2, which is connected to a rear drive shaft A2 and supplies power to the rear drive shaft A2.

[0030] According to the invention, power from the internal combustion engine E and the first motor unit MG1 can be transmitted to the front drive shaft A1 via the planetary gear set PG, and power from the second motor unit MG2 can be transmitted to the rear drive shaft A2, so that a vehicle can be driven via the front wheels, the rear wheels or all wheels according to the drive conditions.

[0031] This means that the internal combustion engine E and the first motor unit MG1 are connected to the front drive shaft A1 via the planetary gear set PG, so that the vehicle can be driven via the front wheels, which are powered by the internal combustion engine E and the first motor unit MG1. The second motor unit MG2 is connected to the rear drive shaft A2, so that the vehicle can be driven via the rear wheels, which are powered by the second motor unit MG2.

[0032] Accordingly, it is possible to drive the vehicle with the front wheels or the rear wheels by controlling the internal combustion engine E, the first motor unit MG1 and the second motor unit MG2, and four-wheel drive is also possible, so that the vehicle can be driven in different ways according to different driving conditions.

[0033] The planetary gear set PG can be composed of a sun gear S, a planet carrier C, and a ring gear R. That is, the first motor unit MG1 can be connected to the sun gear S of the planetary gear set PG, the internal combustion engine E can be connected to the planet carrier C, and the front drive shaft A1 can be connected to the ring gear R.

[0034] The planetary gear set PG can change and transmit a torque from the internal combustion engine E and the first motor unit MG1 according to the gear ratio of the sun gear S, the planet carrier C and the ring gear R, and the gear ratio can be set to a suitable value according to the design.

[0035] The first motor unit MG1 and the second motor unit MG2 can be the motor generators that can provide power to drive a vehicle and generate electrical current.

[0036] The powertrain of a hybrid vehicle according to the invention can drive a vehicle in various drive modes, which include a 1st EV drive mode, a 2nd EV drive mode, a 3rd EV drive mode, a 1st HEV drive mode, a 2nd HEV drive mode, a 3rd HEV drive mode and a 4th HEV drive mode.

[0037] For this purpose, the drive train according to the invention further comprises in detail a first clutch CL1, which is arranged between the rotating element of the planetary gear set PG connected to the first motor unit MG1 and the rotating element of the planetary gear set PG connected to the internal combustion engine E, and a second clutch CL2, which is arranged between the rotating element of the planetary gear set PG connected to the front drive shaft A1 and the front drive shaft A1.

[0038] That is, the first clutch CL1 is arranged between the sun gear S of the planetary gear set PG, which is connected to the first motor unit MG1, and the planet carrier C of the planetary gear set PG, which is connected to the internal combustion engine E, and selectively engages or disengages the sun gear S and the planet carrier C with each other or with each other, and the second clutch CL2 is arranged between the ring gear R of the planetary gear set PG and the front drive shaft A1, and selectively connects or disconnects the power from the internal combustion engine E and the first motor unit MG1 to the front drive shaft A1.

[0039] The operation of the first clutch CL1 and the second clutch CL2 is controlled by a control unit, which may be a conventional control unit for controlling various clutches of a drive train of a hybrid vehicle, so that it is not described here.

[0040] As described herein, since the drive mode is changed according to the engagement states between the first clutch CL1 and the second clutch CL2, different drive modes can be achieved.

[0041] As in Fig. As shown in Figure 2, in the 1st EV drive mode the first clutch CL1 is disengaged, the second clutch CL2 is engaged, and the first motor unit MG1 is operated, so that the vehicle can be driven via the front wheels, which are powered by the power from the first motor unit MG1.

[0042] Alternatively, as in Fig. Figure 3 shows that in the 2nd EV drive mode the first clutch CL1 and the second clutch CL2 are disengaged, and the second motor unit MG2 is operated, so that the vehicle can be driven via the rear wheels, which are operated by the power from the second motor unit MG2.

[0043] In the 1st EV drive mode, by operating only the first motor unit MG1, disengaging the first clutch CL1 and engaging the second clutch CL2, the power is transferred from the first motor unit MG1 to the front drive shaft A1.

[0044] In the second EV drive mode, by disengaging the first clutch CL1 and the second clutch CL2 and operating only the second motor unit MG2, power is transferred from the second motor unit MG2 to the rear drive shaft A2. Since the first clutch CL1 and the second clutch CL2 are disengaged, the driving force of the moving vehicle is transmitted via the front drive shaft A1 to the combustion engine E and the first motor unit MG1, so no power is lost.

[0045] The 1st EV drive mode and the 2nd EV drive mode are suitable for starting and low-speed driving of the vehicle, respectively, and the vehicle can be driven via the front wheels or the rear wheels depending on the driving conditions.

[0046] With reference to Fig. In the 3rd EV drive mode, the first clutch CL1 is disengaged, the second clutch CL2 is engaged, and the first motor unit MG1 and the second motor unit MG2 are operated, so that the vehicle is driven via four wheels powered by the power from the first motor unit MG1 and the second motor unit MG2.

[0047] This means that the first and second EV drive modes are both implemented within the third EV drive mode, in which power from the first motor unit MG1 is transferred to the front drive shaft A1 and power from the second motor unit MG2 is transferred to the rear drive shaft A2, thus creating a four-wheel drive system where the front and rear wheels of the vehicle are driven simultaneously. This is suitable for high-speed driving in EV mode.

[0048] With reference to Fig. In the 1st HEV drive mode, the first clutch CL1 is engaged, the second clutch CL2 is disengaged, the internal combustion engine E is operated, so that the first motor unit MG1 generates electrical current using the power from the internal combustion engine E, and the second motor unit MG2 is operated, and accordingly the rear wheels of the vehicle can be operated by the power from the second motor unit MG2.

[0049] This means that, since the first clutch CL1 is engaged, power from the internal combustion engine E is transmitted to the first motor unit MG1, thus synchronizing the rotational speeds of the internal combustion engine E and the first motor unit MG1. Furthermore, since the second clutch CL2 is disengaged, power from the internal combustion engine E is not transmitted to the front drive shaft A1, so that power from the internal combustion engine E is transmitted only to the first motor unit MG1, and the vehicle is driven via the rear wheels, which are powered by the second motor unit.

[0050] Since the power from the combustion engine E is transferred to the first motor unit MG1 and the first motor unit MG1 is operated by the combustion engine E, electric current can be generated.

[0051] In the first HEV drive mode, since the second motor unit MG2 is operated and the vehicle is driven by the rear wheels via the rear drive shaft A2, a series type of hybrid mode is realized in which the first motor unit MG1 generates electrical current using the power from the combustion engine E and the vehicle is driven by the second motor unit MG2.

[0052] With reference to Fig. In the 2nd HEV drive mode, the first clutch CL1 is disengaged, the second clutch CL2 is engaged, and the internal combustion engine E and the second motor unit MG2 are operated, so that the vehicle is driven via four wheels powered by the power of the internal combustion engine E and the second motor unit MG2.

[0053] This means that since the first clutch CL1 is disengaged, power from the internal combustion engine E is not transmitted to the first motor unit MG1, and since the second clutch CL2 is engaged, power from the internal combustion engine E is transmitted via the planetary gear set PG to the front drive shaft A1. Furthermore, since the second motor unit MG2 is operating, power from the second motor unit MG2 is transmitted to the rear drive shaft A2, so that the vehicle can be driven by four wheels, with the front and rear wheels operating simultaneously.

[0054] In the 2nd HEV drive mode, depending on the vehicle's driving condition, the first motor unit MG1 can also be operated so that the power from the first motor unit MG1 is transferred to the front drive shaft A1 together with the power from the combustion engine E.

[0055] Accordingly, since the first motor unit MG1 is operated in conjunction with the internal combustion engine E, the front drive shaft A1 is rotated by an appropriate level of power from both the internal combustion engine E and the first motor unit MG1. Specifically, the power from the first motor unit MG1 and the power from the internal combustion engine E change the speed of the planetary gear set PG, making it possible to control the speed of the planetary gear set PG to an appropriate level according to the operating condition of the first motor unit MG1.

[0056] With reference to Fig. In the 3rd HEV drive mode, the first clutch CL1 and the second clutch CL2 are engaged, and the internal combustion engine E and the second motor unit MG2 are operated, so that the vehicle can be driven via four wheels powered by the power of the internal combustion engine E and the second motor unit MG2.

[0057] Since the first clutch CL1 and the second clutch CL2 are engaged, the power from the internal combustion engine E is transferred to the planetary gear set PG and the first motor unit MG1, so that the speed of the internal combustion engine E, the speed of the ring gear R of the planetary gear set PG and the speed of the first motor unit MG1 are the same.

[0058] This means that since the internal combustion engine E is running and the first clutch CL1 and the second clutch CL2 are engaged, the power from the internal combustion engine E is transmitted to the front drive shaft A1, and the vehicle is driven. Furthermore, the power is also transmitted to the first motor unit MG1, and the first motor unit MG1 is operated, thus generating electrical current.

[0059] In this case, the power from the internal combustion engine E is distributed to the first engine unit MG1 and the front drive shaft A1, and the second engine unit MG2 is operated to turn the rear drive shaft A2, so that a four-wheel drive can be carried out in which the front wheels and the rear wheels are operated simultaneously.

[0060] With reference to Fig. 8 is the 4th HEV drive mode suitable for driving a vehicle in a fuel-saving mode, and for this purpose a brake B is also provided which selectively limits the rotary element of the planetary gear set PG connected to the first motor unit MG1.

[0061] This means that, since the brake B is operated, the rotation of the first motor unit MG1 is limited, so that the power from the internal combustion engine E is transferred to the front drive shaft A1 and no power loss occurs as a result of the first motor unit MG1.

[0062] Accordingly, in the 4th HEV drive mode, the first clutch CL1 is disengaged, the second clutch CL2 is engaged, the brake B is operated, and the internal combustion engine E and the second motor unit MG2 are operated, so that the vehicle can be driven via four wheels powered by the internal combustion engine E and the second motor unit MG2.

[0063] As described above, since the first clutch CL1 is disengaged and the brake B is applied, the rotation of the first motor unit MG1 is limited, while the second clutch CL2 is engaged, allowing power from the internal combustion engine E to be transmitted to the front drive shaft A1 without any loss due to the first motor unit MG1. Furthermore, since the second motor unit MG2 is engaged, power is transmitted from the second motor unit MG2 to the rear drive shaft A2, enabling the vehicle to be driven by all four wheels, with the front and rear wheels operating simultaneously. The fourth HEV drive mode is suitable for high-speed driving.

[0064] The first motor unit MG1 and the second motor unit MG2 can be controlled independently, and their operation is adjusted to four-wheel drive according to the driving conditions, so that the vehicle drives adapted to the driving conditions.

[0065] Alternatively, an engine coupling CL3 can be arranged between the second engine unit MG2 and the rear drive shaft A2. By disengaging in the various drive modes described herein, the engine coupling CL3 can prevent a loss of power from the second engine unit MG2 when the vehicle is driven via the front wheels.

[0066] When the vehicle is powered by the second motor unit MG2, the vehicle can be driven via the rear wheels by engaging the motor clutch CL3, and inertia loss can be minimized by adjusting the engagement according to the driving conditions.

[0067] A one-way clutch (OWC) can be arranged between the internal combustion engine (E) and the planetary gear set (PG). When the one-way clutch (OWC) is arranged between the internal combustion engine (E) and the planetary gear set (PG), the power from the internal combustion engine (E) is transmitted via the planetary gear set (PG) to a drive shaft, while the torque transmitted in reverse from the drive shaft to the internal combustion engine (E) can be blocked, thus preventing reverse rotation of the internal combustion engine (E).

[0068] The powertrain of a hybrid vehicle according to the invention can provide different drive modes for propelling a vehicle, so that it is possible for a vehicle to drive efficiently according to different drive conditions.

[0069] In particular, by controlling a planetary gear set and a plurality of clutches, power loss through the drivetrain is minimized in front-wheel or rear-wheel drive, and it is possible to achieve both an EV mode and regenerative braking by using all motors intended for the front and rear wheels, thus ensuring high energy efficiency.

[0070] To simplify the explanation and precise definition of the attached claims, the terms "front", "rear", etc. are used to describe the features of the exemplary embodiment in relation to the positions of these features in the figures.

Claims

[1] Powertrain of a hybrid vehicle comprising: a planetary gear set (PG) comprising three rotating elements, one of which is connected to an internal combustion engine (E) and another of which is connected to a front drive shaft (A1); a first motor unit (MG1) which is connected to the remaining rotating element of the three rotating elements; a second motor unit (MG2) which is connected to a rear drive shaft (A2) and supplies power to the rear drive shaft (A2); a first clutch (CL1) which is arranged between the rotating element of the planetary gear set (PG) connected to the first motor unit (MG1) and the rotating element of the planetary gear set (PG) connected to the internal combustion engine (E); a second clutch (CL2) arranged between the front drive shaft (A1) and the rotating element of the planetary gear set (PG) connected to the front drive shaft (A1); and a brake (B) that selectively limits the rotational element of the planetary gear set (PG) connected to the first motor unit (MG1), wherein a drive mode changes according to the engagement states of the first clutch (CL1) and the second clutch (CL2), and wherein in a 4th HEV drive mode the first clutch (CL1) is disengaged, the second clutch (CL2) is engaged, the brake (B) is operated, and the internal combustion engine (E) and the second motor unit (MG2) are operated, so that the vehicle is driven via four wheels powered by the internal combustion engine (E) and the second motor unit (MG2). [2] Drive train according to claim 1, wherein the planetary gear set (PG) comprises a sun gear (S), a planet carrier (C) and a ring gear (R). [3] Drive train according to claim 2, wherein the first motor unit (MG1) is connected to the sun gear (S) of the planetary gear set (PG), the internal combustion engine (E) is connected to the planet carrier (C), and the front drive shaft (A1) is connected to the ring gear (R). [4] Powertrain according to any one of claims 1 to 3, wherein in a 1. EV drive mode the first clutch (CL1) is disengaged, the second clutch (CL2) is engaged, and the first motor unit (MG1) is operated, so that the vehicle is driven via front wheels which are operated by power from the first motor unit (MG1). [5] Powertrain according to any one of claims 1 to 3, wherein in a 2nd EV drive mode the first clutch (CL1) and the second clutch (CL2) are disengaged, and the second motor unit (MG2) is operated, so that the vehicle is driven via rear wheels which are operated by power from the second motor unit (MG2). [6] Powertrain according to any one of claims 1 to 3, wherein in a 3rd EV drive mode the first clutch (CL1) is disengaged, the second clutch (CL2) is engaged, and the first motor unit (MG1) and the second motor unit (MG2) are operated, so that the vehicle is driven via four wheels which are powered by power from the first motor unit (MG1) and the second motor unit (MG2). [7] Powertrain according to any one of claims 1 to 3, wherein in a 1. HEV drive mode the first clutch (CL1) is engaged, the second clutch (CL2) is disengaged, and the internal combustion engine (E) is operated, such that the first motor unit (MG1) generates electric current by means of power from the internal combustion engine (E), the second motor unit (MG2) is operated, and the vehicle is driven via rear wheels which are operated by the power from the second motor unit (MG2). [8] Powertrain according to any one of claims 1 to 7, wherein in a 2nd HEV drive mode the first clutch (CL1) is disengaged, the second clutch (CL2) is engaged, and the internal combustion engine (E) and the second motor unit (MG2) are operated, so that the vehicle is driven via four wheels which are powered by power from the internal combustion engine (E) and the second motor unit (MG2). [9] Powertrain according to claim 8, wherein in the 2nd HEV drive mode the first motor unit (MG1) is operated according to a driving condition of the vehicle, so that power from the first motor unit (MG1) together with the power from the internal combustion engine (E) is transferred to the front drive shaft (A1). [10] Powertrain according to one of claims 1 to 3, wherein in a 3. HEV drive mode the first clutch (CL1) and the second clutch (CL2) are engaged, and the internal combustion engine (E) and the second motor unit (MG2) are operated, so that the vehicle is driven via four wheels which are operated by power from the internal combustion engine (E) and the second motor unit (MG2). [11] Drive train according to any one of claims 1 to 10, wherein a motor coupling (CL3) is arranged between the second motor unit (MG2) and the rear drive shaft (A2). [12] Drive train according to any one of claims 1 to 11, wherein a one-way coupling (OWC) is arranged between the internal combustion engine (E) and the planetary gear set (PG). [13] Powertrain of a hybrid vehicle comprising: a planetary gear set (PG) comprising three rotating elements, one of which is connected to an internal combustion engine (E) and another of which is connected to a front drive shaft (A1); a first motor unit (MG1) which is connected to the remaining rotating element of the three rotating elements; a second motor unit (MG2) which is connected to a rear drive shaft (A2) and supplies power to the rear drive shaft (A2); a first clutch (CL1) arranged between the rotating element of the planetary gear set (PG) connected to the first motor unit (MG1) and the rotating element of the planetary gear set (PG) connected to the internal combustion engine (E); and a second clutch (CL2) which is arranged between the front drive shaft (A1) and the rotating element of the planetary gear set (PG) connected to the front drive shaft (A1), wherein a drive mode changes according to the engagement states of the first clutch (CL1) and the second clutch (CL2), and wherein in a 3rd EV drive mode the first clutch (CL1) is disengaged, the second clutch (CL2) is engaged, and the first motor unit (MG1) and the second motor unit (MG2) are operated, so that the vehicle is driven via four wheels powered by power from the first motor unit (MG1) and the second motor unit (MG2).

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