Hybrid Power Transmission System

Abstract

To provide a hybrid power transmission system which can be switched to a hybrid power mode, a pure engine mode, or a pure electric mode according to different driving situations to improve energy use efficiency.SOLUTION: A hybrid power transmission system 100 includes an engine 110, a power distributor 120, a first electric motor 130, a second electric motor 140, an electric energy controller 150, an energy storage module 160, and a wheel 170. The power distributor is connected to the engine. The first electric motor is connected to the power distributor. The second electric motor is connected to the power distributor. The electric energy controller is coupled to the first electric motor and the second electric motor. The energy storage module is coupled to the electric energy controller. The wheel is connected to the second electric motor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to power transmission systems, and more particularly to hybrid power transmission systems. [Background technology]

[0002] With the rise of environmental awareness around the world, an increasing number of countries are enacting laws regulating environmental standards for fuel-powered vehicles, resulting in a boom in electric vehicles. Electric vehicles, in particular, are a form of transportation that differs from fuel-powered vehicles in that they have advantages such as not emitting exhaust gases and being quieter, and are attracting attention as an important tool for realizing low-carbon transportation.

[0003] However, there are limitations in the development of existing energy storage and charging technologies, resulting in a bottleneck in the range of electric vehicles. Therefore, as a transitional product before the development of fully electric vehicles, fuel-electric hybrid vehicles have a longer range than electric vehicles and better environmental performance than fuel-powered vehicles. However, the power systems of existing fuel-electric hybrid vehicles are complex, and energy losses occur during the power transmission process between each transmission mechanism due to the connections between the fuel engine, electric motor, and transmission, making the energy usage efficiency of fuel-electric hybrid vehicles inefficient. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a hybrid power transmission system that can be switched between hybrid power mode, pure engine mode, or pure electric mode according to different driving conditions to improve energy usage efficiency. [Means for solving the problem]

[0005] The hybrid power transmission system of the present invention includes an engine, a power distributor, a first electric motor, a second electric motor, an electric energy controller, an energy storage module, and wheels. The power distributor is connected to the engine. The first electric motor is connected to the power distributor. The second electric motor is connected to the power distributor. The electric energy controller is coupled to the first electric motor and the second electric motor. The energy storage module is coupled to the electric energy controller. The wheels are connected to the second electric motor. The engine is suitable for driving the second electric motor and the wheels via the power distributor, the energy storage module is suitable for driving the second electric motor and the wheels via the electric energy controller, and the engine is suitable for driving the first electric motor and the second electric motor and the wheels via the electric energy controller.

[0006] In one embodiment of the present invention, the power distributor has a ring gear, a reduction gear, a planetary gear set, and a sun gear, the reduction gear is connected to the engine and meshes with the external teeth of the ring gear, the planetary gear set meshes with the internal teeth of the ring gear, and the sun gear is connected to the first electric motor and meshes with the planetary gear set.

[0007] In one embodiment of the present invention, the transmission further includes a clutch disposed between the sun gear and the ring gear.

[0008] In one embodiment of the present invention, the vehicle further includes a power transmission mechanism connected to the power distributor, the second electric motor, and the wheels.

[0009] In one embodiment of the present invention, the above-mentioned transmission mechanism includes a first transmission wheel, a second transmission wheel, a third transmission wheel, a fourth transmission wheel, and a first chain, wherein the first transmission wheel is fixedly connected to the planetary gear set, the second transmission wheel is adjacent to the first transmission wheel, the third transmission wheel is coaxially connected to the second transmission wheel, and the fourth transmission wheel is coaxially connected to the second electric motor and the wheel, and the fourth transmission wheel is meshed with the third transmission wheel.

[0010] In one embodiment of the present invention, the above-mentioned transmission mechanism includes a first transmission wheel, a second transmission wheel, a third transmission wheel, a fourth transmission wheel, a first chain, and a second chain, wherein the first transmission wheel is fixedly connected to the planetary gear set, the second transmission wheel is adjacent to the first transmission wheel, the third transmission wheel is coaxially connected between the second transmission wheel and the second electric motor, and the fourth transmission wheel is coaxially connected to the wheel, the first chain is fitted between the first transmission wheel and the second transmission wheel, and the second chain is fitted between the third transmission wheel and the fourth transmission wheel.

[0011] In one embodiment of the present invention, in a pure engine mode, the clutch locks the sun gear and the ring gear together, causing the planetary gear set and the ring gear to form a rigid body, and the engine is adapted to generate first mechanical energy to directly drive the power distributor through the reduction gear.

[0012] In one embodiment of the present invention, in a hybrid power mode, the clutch separates the sun gear and the ring gear, the engine is adapted to generate first mechanical energy, and a portion of the first mechanical energy drives a second electric motor via a power distributor, and another portion of the first mechanical energy drives the first electric motor via the power distributor to generate second electrical energy, which is supplied to the second electric motor via an electrical energy controller, and the second electric motor generates the second mechanical energy to drive the wheels.

[0013] In one embodiment of the present invention, in a pure electric mode, the energy storage module generates and provides first electrical energy to the first electric motor and the second electric motor via the electrical energy controller, and the second electric motor generates second mechanical energy to drive and rotate the wheels. [Effects of the Invention]

[0014] Based on the above, the hybrid power transmission system of the present invention is suitable for motorcycles, automobiles or similar transportation vehicles, and the hybrid power transmission system can be combined with power sources such as an engine, a first electric motor, a second electric motor, and an energy storage module. In the present invention, according to the driving situation, the hybrid power mode, the pure engine mode or the pure electric mode can be switched on or off correspondingly to reduce energy consumption and improve the driving range of the transportation vehicle.

[0015] Furthermore, the hybrid power transmission system of the present invention can achieve the purpose of switching between the pure engine mode and the hybrid power mode by simply opening and closing the clutch, and has the characteristics of simplified switching steps and a simple structure compared to existing combined power systems. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a block diagram of a hybrid power transmission system of the present invention; [Figure 2] FIG. 2 is a structural connection diagram of an embodiment of the hybrid power transmission system of FIG. 1. [Figure 3] FIG. 2 is a structural connection diagram of another embodiment of the hybrid power transmission system of FIG. 1; [Figure 4A] 2 is a block schematic diagram of the power drive of the hybrid power transmission system of FIG. 1 in a hybrid power mode. FIG. [Figure 4B] FIG. 4B is a diagram showing the relationship between the rotational speeds of the engine, the first electric motor, and the second electric motor of FIG. 4A. [Figure 5A] FIG. 2 is a block schematic diagram of the hybrid power transmission system of FIG. 1 in a pure engine mode of power drive; [Figure 5B] FIG. 5B is a diagram showing the relationship between the rotational speeds of the engine, the first electric motor, and the second electric motor of FIG. 5A. [Figure 6A]FIG. 2 is a block schematic diagram of the power drive of the hybrid power transmission system of FIG. 1 in a pure electric mode. [Figure 6B] FIG. 6B is a diagram showing the relationship between the rotational speeds of the engine, the first electric motor, and the second electric motor of FIG. 6A. [Figure 7] FIG. 2 is a schematic diagram of a mode switching rule of the hybrid power transmission system of FIG. 1; DETAILED DESCRIPTION OF THE INVENTION

[0017] Fig. 1 is a block diagram of a hybrid power transmission system of the present invention. Fig. 2 is a structural connection diagram of an embodiment of the hybrid power transmission system of Fig. 1. Fig. 3 is a structural connection diagram of another embodiment of the hybrid power transmission system of Fig. 1.

[0018] 1 to 3, the hybrid power transmission system 100 of the present invention is suitable for a motorcycle, automobile, or similar transportation tool and includes an engine 110, a power distributor 120, a first electric motor 130, a second electric motor 140, an electric energy controller 150, an energy storage module 160, and wheels 170.

[0019] An engine 110 is disposed in a transportation tool and uses fuel as an energy source. A power distributor 120 is connected to the engine 110. A first electric motor 130 is connected to the power distributor 120. A second electric motor 140 is connected to the power distributor 120. An electric energy controller 150 is coupled to the first electric motor 130 and the second electric motor 140. An energy storage module 160 is coupled to the electric energy controller 150. Wheels 170 are connected to the second electric motor 140.

[0020] 1 , engine 110 is suitable for driving first electric motor 130 and second electric motor 140 and wheels 170 via electric energy controller 150, and simultaneously for directly driving second electric motor 140 via power distributor 120 to switch to hybrid power mode. Engine 110 is suitable for driving second electric motor 140 and wheels 170 via power distributor 120 to switch to pure engine mode. Energy storage module 160 is suitable for driving second electric motor 140 and wheels 170 via electric energy controller to switch to pure electric mode.

[0021] 2 and 3, the power distributor 120 has a ring gear 121, a reduction gear 122, a planetary gear set 123, and a sun gear .

[0022] The ring gear 121 has internal teeth and external teeth (not shown). The reduction gear 122 is connected to the rotating shaft of the engine 110 and meshes with the external teeth of the ring gear 121, thereby transmitting power from the engine 110 to the ring gear 121 via the reduction gear 122. The planetary gear set 123 meshes with the internal teeth of the ring gear 121, i.e., the ring gear 121 can drive the planetary gear set 123 via the internal teeth. The sun gear 124 is connected to the rotating shaft of the first electric motor 130 and meshes with the planetary gear set 123, thereby transmitting power generated by the first electric motor 130 to the planetary gear set 123 via the sun gear 124.

[0023] The hybrid power transmission system 100 includes a clutch 180 disposed between the sun gear 124 and the ring gear 121. When the clutch 180 is disengaged, the sun gear 124 and the ring gear 121 are two independent components that can rotate freely, and when the clutch 180 is engaged, the sun gear 124 and the ring gear 121 are connected as a single unit and rotate synchronously. The multiple power sources of the present invention change the state of the power distributor 120 by turning the clutch 180 on and off, thereby simplifying the switching steps of the hybrid power transmission system 100.

[0024] 2 and 3, hybrid power transmission system 100 includes a power transmission mechanism 190 that is connected to a power distributor 120, a second electric motor 140, and wheels 170. That is, power from engine 110 and first electric motor 130 is transmitted to wheels 170 via power distributor 120 and power transmission mechanism 190, and power from second electric motor 140 is transmitted to wheels 170 via power transmission mechanism 190. Because multiple power sources of the present invention share the same power transmission mechanism 190, hybrid power transmission system 100 has the characteristic of being simple in structure.

[0025] 2 , the transmission mechanism 190 includes a first transmission wheel 191, a second transmission wheel 192, a third transmission wheel 193, a fourth transmission wheel 194, and a first chain 195. The first transmission wheel 191 is fixedly connected to the planetary gear set 123, the second transmission wheel 192 is adjacent to the first transmission wheel 191, the third transmission wheel 193 is coaxially connected to the second transmission wheel 192, and the fourth transmission wheel 194 is coaxially connected to the second electric motor 140 and the wheel 170 and meshes with the third transmission wheel 193. The second electric motor 140 is an in-wheel motor and is coaxially mounted on the wheel 170.

[0026] In other words, the power transmission path of the engine 110 and the first electric motor 130 is, in order, the power distributor 120, the first transmission wheel 191, the first chain 195, the second transmission wheel 192, the third transmission wheel 193, the fourth transmission wheel 194, the second electric motor 140, and finally transmitted to the wheel 170.

[0027] 3, there is a difference between this embodiment and the embodiment of FIG. 2, in that a transmission mechanism 190 has a first transmission wheel 191, a second transmission wheel 192, a third transmission wheel 193, a fourth transmission wheel 194, a first chain 195, and a second chain 196. The first transmission wheel 191 is fixedly connected to the planetary gear set 123, the second transmission wheel 192 is adjacent to the first transmission wheel 191, the third transmission wheel 193 is coaxially connected between the second transmission wheel 192 and the second electric motor 140, the fourth transmission wheel 194 is coaxially connected to the wheel 170, the first chain 195 is fitted to the first transmission wheel 191 and the second transmission wheel 192, and the second chain 196 is fitted to the third transmission wheel 193 and the fourth transmission wheel 194. Of these, the second electric motor 140 is connected in parallel to the power distributor 120 .

[0028] In other words, the power transmission path between the engine 110 and the first electric motor 130 is, in order, the power distributor 120, the first transmission wheel 191, the first chain 195, the second transmission wheel 192, the third transmission wheel 193, the second electric motor 140, the second chain 196, and the fourth transmission wheel 194, and is finally transmitted to the wheel 170.

[0029] Fig. 4A is a block schematic diagram of power driving in a hybrid power mode of the hybrid power transmission system of Fig. 1. Fig. 4B is a diagram showing the relationship between the rotational speeds of the engine, the first electric motor, and the second electric motor of Fig. 4A.

[0030] 2, 4A, and 4B, in the hybrid power transmission system, in a hybrid power mode, the clutch 180 unlocks the sun gear 124 and the ring gear 121. The engine 110 is adapted to generate and transmit a first mechanical energy M1 to the power distributor 120, of which a portion of the first mechanical energy M1 directly drives and rotates the wheels 170 via the reduction gear 122, the ring gear 121, and the transmission mechanism 190, and another portion of the first mechanical energy M1 drives the first electric motor 130 via the reduction gear 122, the ring gear 121, and the sun gear 124 to generate a first electric energy E1, which is provided to the second electric motor 140 via the electric energy controller 150. By combining the first mechanical energy M1 and the first electric energy E1, the second electric motor 140 generates a second mechanical energy M2 to drive and rotate the wheels 170.

[0031] JPEG0007744054000001.jpg52163

[0032] JPEG0007744054000002.jpg61164

[0033] According to the connection method of the hybrid power transmission system in Figure 3, the relationship between the rotation speed and the torsional force can be expressed by the following equation:

[0034] JPEG0007744054000003.jpg14106

[0035] JPEG0007744054000004.jpg40163

[0036] FIG. 7 is a schematic diagram of the mode switching rules of the hybrid power transmission system of FIG.

[0037] Referring also to FIG. 7, in the hybrid power mode, during slow acceleration and low-speed cruising, the first mechanical energy M1 generated by the engine 110 simultaneously drives the second electric motor 140 and the first electric motor 130, thereby adjusting the rotational speed and operating point of the engine 110 and achieving energy saving and speed change functions. In addition, in the hybrid power mode, the first electric motor 130 switches to a generator to generate the first electrical energy E1 to directly drive the second electric motor 140. At the same time, the first electric motor 130 also functions as a load for the transmission system, continuously changing the ratio between the input rotational speed of the engine 110 and the output rotational speed of the wheels 170.

[0038] Fig. 5A is a block schematic diagram of power drive in a pure engine mode of the hybrid power transmission system of Fig. 1. Fig. 5B is a rotational speed relationship diagram of the engine, first electric motor, and second electric motor of Fig. 5A.

[0039] 3, 5A, and 5B, in the hybrid power transmission system 100 in a pure engine mode, the clutch 180 locks the sun gear 124 and the ring gear 121 together, causing the planetary gear set 123 and the ring gear 121 to form a rigid body, and the engine 110 generates the first mechanical energy M1 to directly drive the power distributor 120 via the reduction gear 122, and the power distributor 120 directly drives the second electric motor 140 and the wheels 170 to rotate via the transmission mechanism 190.

[0040] JPEG0007744054000005.jpg29163

[0041] Referring also to FIG. 7, the pure engine mode is applicable to high-speed cruising situations, in which the first mechanical energy M1 generated by the engine 110 is suitable for directly driving the second electric motor 140 and the wheels 170 via the power distributor 120 and the transmission mechanism 190. Since the first electric motor 130 and the power distributor 120 form a rigid body, all of the first mechanical energy M1 generated by the engine 110 is used to drive the second electric motor 140 and the wheels 170, thereby avoiding energy loss when converting mechanical energy into electrical energy.

[0042] Fig. 6A is a block schematic diagram of power driving in a pure electric mode of the hybrid power transmission system of Fig. 1. Fig. 6B is a rotational speed relationship diagram of the engine, first electric motor, and second electric motor of Fig. 6A.

[0043] 3, 6A, and 6B, in the pure electric mode of hybrid power transmission system 100, engine 110 is not started, energy storage module 160 generates second electric energy E2 and provides it to first electric motor 130 and second electric motor 140 via electric energy controller 150, and second electric motor 140 generates second mechanical energy M2 to drive and rotate wheels 170. Specifically, first electric motor 130 functions as a load that consumes a portion of second electric energy E2, and energy storage module 160 continuously changes the total amount of electric energy input to second electric motor 140 to adjust the output rotational speed of wheels 170.

[0044] JPEG0007744054000006.jpg61164

[0045] Referring also to FIG. 7, the pure electric mode is suitable for launching to prevent the engine 110 from consuming fuel from a standstill.

[0046] In summary, the hybrid power transmission system of the present invention is suitable for motorcycles, automobiles or similar transportation vehicles, and can be combined with power sources such as an engine, a first electric motor, a second electric motor, and an energy storage module. In the present invention, depending on the driving situation, the hybrid power transmission system can switch between hybrid power mode, pure engine mode or pure electric mode, and can correspondingly turn on or off the engine, first electric motor, second electric motor and energy storage module to reduce energy consumption and improve the driving range of the transportation vehicle.

[0047] Furthermore, the hybrid power transmission system of the present invention can achieve the purpose of switching between the pure engine mode and the hybrid power mode by simply opening and closing the clutch, and has the characteristics of simplified switching steps and a simple structure compared to existing combined power systems. [Industrial Applicability]

[0048] The hybrid power transmission system of the present invention can be applied to the field of transportation tools to improve the running range of the transportation tools. [Explanation of symbols]

[0049] 100: Hybrid power transmission system 110: Engine 120: Power distributor 121: Ring gear 122: Reduction gear 123: Planetary Gear Group 124: Sun Gear 130: First electric motor 140: Second electric motor 150: Electrical energy controller 160: Energy storage module 170: Wheel 180: Clutch 190: Transmission mechanism 191: First transmission wheel 192: Second transmission wheel 193: Third transmission wheel 194: 4th transmission wheel 195: First Chain 196: Second Chain M1: First mechanical energy M2: Second mechanical energy E1: First electric energy E2: Second electric energy

Claims

1. The engine and a power distributor connected to the engine and having a ring gear, a reduction gear, a planetary gear set, and a sun gear; a clutch disposed between the sun gear and the ring gear; a first electric motor connected to the power distributor; a second electric motor connected to the power distributor; an electric energy controller coupled to the first electric motor and the second electric motor; an energy storage module coupled to the electrical energy controller; a wheel connected to the second electric motor; the reduction gear is connected to the engine and meshes with the external teeth of the ring gear, the planetary gear set meshes with the internal teeth of the ring gear, and the sun gear is connected to the first electric motor and meshes with the planetary gear set; the engine is adapted to drive the second electric motor and the wheels via the power distributor, the energy storage module is adapted to drive the second electric motor and the wheels via the electric energy controller, the engine is adapted to drive the first electric motor and the second electric motor and the wheels via the electric energy controller; In a pure engine mode, the clutch locks the sun gear and the ring gear together, causing the planetary gear set and the ring gear to form a rigid body, and the engine is adapted to generate first mechanical energy to directly drive the power distributor via the reduction gear.

2. The hybrid power transmission system of claim 1 further comprising a powertrain, said powertrain connected to said power distributor, said second electric motor, and said wheels.

3. 3. The hybrid power transmission system of claim 2, wherein the transmission mechanism includes a first transmission wheel, a second transmission wheel, a third transmission wheel, a fourth transmission wheel, and a first chain, wherein the first transmission wheel is fixedly connected to the planetary gear set, the second transmission wheel is adjacent to the first transmission wheel, the third transmission wheel is coaxially connected to the second transmission wheel, the fourth transmission wheel is coaxially connected to the second electric motor and the wheel, and the fourth transmission wheel meshes with the third transmission wheel.

4. 3. The hybrid power transmission system of claim 2, wherein the transmission mechanism includes a first transmission wheel, a second transmission wheel, a third transmission wheel, a fourth transmission wheel, a first chain, and a second chain, wherein the first transmission wheel is fixedly connected to the planetary gear set, the second transmission wheel is adjacent to the first transmission wheel, the third transmission wheel is coaxially connected between the second transmission wheel and the second electric motor, and the fourth transmission wheel is coaxially connected to the wheel, the first chain is fitted between the first transmission wheel and the second transmission wheel, and the second chain is fitted between the third transmission wheel and the fourth transmission wheel.

5. 2. The hybrid power transmission system of claim 1, wherein in a hybrid power mode, the clutch separates the sun gear and the ring gear, the engine is adapted to generate first mechanical energy, and a portion of the first mechanical energy drives the second electric motor via the power distributor, and another portion of the first mechanical energy drives the first electric motor via the power distributor to generate second electrical energy, the second electrical energy is provided to the second electric motor via the electrical energy controller, and the second electric motor generates second mechanical energy to drive the wheels.

6. 2. The hybrid power transmission system of claim 1, wherein in a pure electric mode, the energy storage module generates and provides first electrical energy to the first electric motor and the second electric motor via the electrical energy controller, and the second electric motor generates second mechanical energy to drive and rotate the wheels.

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