Dual-motor four-wheel-drive hybrid power system, control method and vehicle

Abstract

The invention discloses a dual-motor four-wheel-drive hybrid power system. Comprising an engine, a first motor, a second motor, a double clutch connected with the engine, a first transmission mechanism connected with the first motor and the double clutch, a second transmission mechanism connected with the double clutch and a first wheel, and a third transmission mechanism connected with the second motor and a second wheel. According to the dual-motor four-wheel-drive hybrid power system, through coordinated control over all the components, multiple operation modes of pure electricity, range extending and parallel connection can be achieved through the two motors, the structure is simple, cost is low, the system efficiency can be improved, and the motor utilization rate can be increased. The invention further discloses a control method of the dual-motor four-wheel-drive hybrid power system and a vehicle.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and in particular, relates to a dual-motor four-wheel drive hybrid power system, a control method and a vehicle. Background Art

[0002] With the advancement of battery and motor technology, as well as people's increased environmental awareness and focus on energy efficiency, hybrid vehicles have become a hot topic for automobile manufacturers and research and development institutions, and the market penetration of hybrid vehicles continues to grow. The current mainstream hybrid architectures include series architecture, parallel architecture, series-parallel architecture, and power split architecture.

[0003] At present, the four-wheel drive structure based on the series-parallel configuration is mostly three motors, namely P1 generator + P3 drive motor + P4 drive motor. The structure is complex and the cost is high. In addition, in the engine operation mode, one or more motors are reverse-drag, which is inefficient. In daily use, most working conditions are in two-wheel drive operation, and the motor idle rate is high.

[0004] It is desirable to provide an improved dual-motor all-wheel drive hybrid system, particularly with regard to how to improve system efficiency and enhance motor utilization. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a dual-motor four-wheel drive hybrid system, the purpose of which is to improve system efficiency and enhance motor utilization.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dual-motor four-wheel drive hybrid system, including an engine, a first motor, a second motor, a dual clutch connected to the engine, a first transmission mechanism connected to the first motor and the dual clutch, a second transmission mechanism connected to the dual clutch and the first wheel, and a third transmission mechanism connected to the second motor and the second wheel.

[0007] The dual clutch includes a first clutch and a second clutch, the first clutch and the second clutch are connected to the output end of the engine, the first clutch is connected to the first transmission mechanism, and the second clutch is connected to the first transmission mechanism and the second transmission mechanism.

[0008] When the first clutch is in the engaged state, the engine drives the first motor to operate through the first transmission mechanism, and the first motor generates electricity.

[0009] When the second clutch is in a engaged state, the first motor drives the first wheel to rotate through the first transmission mechanism and the second transmission mechanism.

[0010] The first transmission mechanism includes a first gear and a second gear that are meshed with each other, the first gear is connected to the first motor, and the second gear is connected to the dual clutch.

[0011] The second transmission mechanism includes a third gear and a fourth gear that are meshed with each other, the third gear is connected to the dual clutch, and the fourth gear is connected to the first wheel.

[0012] The third transmission mechanism includes a first gear set and a second gear set connected to each other, the first gear set is connected to the second motor, and the second gear set is connected to the second gear.

[0013] The first gear set includes a fifth gear and a sixth gear that are meshed with each other, the fifth gear is connected to the second motor, and the sixth gear is connected to the second gear set.

[0014] The second gear set includes a seventh gear and an eighth gear that are meshed with each other, the seventh gear is connected to the sixth gear, and the eighth gear is connected to the second wheel.

[0015] The present invention also provides a control method for a dual-motor four-wheel drive hybrid power system, comprising:

[0016] When the dual-motor four-wheel drive hybrid system operates in pure electric mode, the dual clutch is in a disengaged state, and the second motor operates to provide driving force for driving the vehicle;

[0017] When the dual-motor four-wheel drive hybrid system operates in the extended-range mode, the engine drives the first motor to operate, the first motor generates electricity, and the second motor operates to provide driving force for driving the vehicle;

[0018] When the dual-motor four-wheel drive hybrid power system operates in parallel mode, the engine provides driving force to drive the vehicle, and the second motor adjusts the engine operating point.

[0019] The present invention also provides a vehicle, comprising the dual-motor four-wheel drive hybrid power system.

[0020] The dual-motor four-wheel drive hybrid power system of the present invention can realize pure electric, extended-range, and parallel operation modes by using two motors through coordinated control of various components. It has a simple structure and low cost, and can improve system efficiency and enhance motor utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the dual-motor four-wheel drive hybrid power system of the present invention;

[0022] Figure 2 This is the energy flow diagram of a pure electric two-wheel drive;

[0023] Figure 3 This is the energy flow diagram of the pure electric four-wheel drive;

[0024] Figure 4 It is the energy flow diagram of the extended range mode;

[0025] Figure 5 It is the energy flow diagram of parallel mode;

[0026] The marks in the above figures are: 1. first motor; 2. second motor; 3. engine; 4. first clutch; 5. second clutch; 6. first wheel; 7. second wheel; 8. first gear; 9. second gear; 10. third gear; 11. fourth gear; 12. fifth gear; 13. sixth gear; 14. seventh gear; 15. eighth gear. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower" and similar expressions used in this article are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figures 1 to 5 As shown, the present invention provides a dual-motor four-wheel drive hybrid system, including an engine 3, a first motor 1, a second motor 2, a dual clutch connected to the engine 3, a first transmission mechanism connected to the first motor 1 and the dual clutch, a second transmission mechanism connected to the dual clutch and the first wheel 6, and a third transmission mechanism connected to the second motor 2 and the second wheel 7.

[0031] The dual clutch includes a first clutch 4 and a second clutch 5. The first clutch 4 and the second clutch 5 are connected to the output end of the engine 3. The first clutch 4 is connected to the first transmission mechanism, and the second clutch 5 is connected to the first transmission mechanism and the second transmission mechanism.

[0032] When the first clutch 4 is in the engaged state, the engine 3 drives the first motor 1 to operate through the first transmission mechanism, and the first motor 1 generates electricity.

[0033] When the second clutch 5 is in the engaged state, the first motor 1 drives the first wheel 6 to rotate through the first transmission mechanism and the second transmission mechanism.

[0034] The first transmission mechanism includes a first gear 8 and a second gear 9 that are meshed with each other. The first gear 8 is connected to the first motor 1 , and the second gear 9 is connected to the dual clutch.

[0035] The second transmission mechanism includes a third gear 10 and a fourth gear 11 that are meshed with each other. The third gear 10 is connected to the dual clutch, and the fourth gear 11 is connected to the first wheel 6 .

[0036] The third transmission mechanism includes a first gear group 8 and a second gear group 9 connected to each other. The first gear group 8 is connected to the second motor 2 , and the second gear group 9 is connected to the second gear 9 .

[0037] The first gear set 8 includes a fifth gear 12 and a sixth gear 13 meshing with each other, the fifth gear 12 is connected to the second motor 2, and the sixth gear 13 is connected to the second gear set 9.

[0038] The second gear 9 group includes a seventh gear 14 and an eighth gear 15 that are meshed with each other. The seventh gear 14 is connected to the sixth gear 13 , and the eighth gear 15 is connected to the second wheel 7 .

[0039] The present invention also provides a control method for a dual-motor four-wheel drive hybrid power system, comprising:

[0040] When the dual-motor four-wheel drive hybrid system operates in pure electric mode, the dual clutch is in a disengaged state, and the second motor 2 operates to provide driving force for driving the vehicle;

[0041] When the dual-motor four-wheel drive hybrid system works in the extended-range mode, the engine 3 drives the first motor 1 to operate, the first motor 1 generates electricity, and the second motor 2 operates to provide driving force for driving the vehicle;

[0042] When the dual-motor four-wheel drive hybrid power system operates in parallel mode, the engine 3 provides driving force for driving the vehicle, and the second motor 2 adjusts the working point of the engine 3.

[0043] The present invention also provides a vehicle, comprising the dual-motor four-wheel drive hybrid power system.

[0044] Example

[0045] First, as Figures 1 to 5 As shown, an embodiment of the present invention provides a dual-motor four-wheel drive hybrid system, including an engine 3, a first motor 1, a second motor 2, a dual clutch connected to the engine 3, a first transmission mechanism connected to the first motor 1 and the dual clutch, a second transmission mechanism connected to the dual clutch and the first wheel 6, and a third transmission mechanism connected to the second motor 2 and the second wheel 7.

[0046] Specifically, if Figures 1 to 5 As shown, the dual clutch includes a first clutch 4 and a second clutch 5, the first clutch 4 and the second clutch 5 are connected to the output end of the engine 3, the first clutch 4 is connected to the first transmission mechanism, and the second clutch 5 is connected to the first transmission mechanism and the second transmission mechanism. The dual clutch is used to transmit the output power of the engine 3 and select different clutches (the first clutch 4 and the second clutch 5) for engagement and separation according to driving needs to achieve switching of working modes and power transmission routes. The dual-motor four-wheel drive hybrid system can achieve three modes: pure electric mode, extended range mode, and parallel mode, which can improve system efficiency and enhance motor utilization.

[0047] In the embodiment of the present invention, Figure 4 As shown, when the first clutch 4 is in an engaged state, the second clutch 5 is in a disengaged state, the engine 3 drives the first motor 1 to operate through the first transmission mechanism, the first motor 1 generates electricity to provide electrical energy for the second motor 2, the second motor 2 can generate a driving force to drive the vehicle to travel, and the second motor 2 drives the second wheel 7 to rotate.

[0048] In the embodiment of the present invention, Figure 3 As shown, when the second clutch 5 is in the engaged state, the first motor 1 is running, and the first motor 1 drives the first wheel 6 to rotate through the first transmission mechanism and the second transmission mechanism, and the first motor 1 can generate a driving force to drive the vehicle to travel.

[0049] In the embodiment of the present invention, Figures 1 to 5As shown, the first transmission mechanism includes a meshing first gear 8 and a second gear 9, the first gear 8 is connected to the first motor 1, and the second gear 9 is connected to the dual clutch. The diameter of the first gear 8 is smaller than the diameter of the second gear 9, the axis of the first gear 8 is parallel to the axis of the second gear 9, the first gear 8 is fixedly connected to the output end of the first motor 1, the second gear 9 is connected to the output ends of the first clutch 4 and the second clutch 5, and the input ends of the first clutch 4 and the second clutch 5 are connected to the output end of the engine 3.

[0050] In the embodiment of the present invention, Figures 1 to 5 As shown, the second transmission mechanism includes a meshing third gear 10 and a fourth gear 11, the third gear 10 is connected to the dual clutch, and the fourth gear 11 is connected to the first wheel 6. The diameter of the third gear 10 is smaller than the diameter of the fourth gear 11, the axis of the third gear 10 is parallel to the axis of the fourth gear 11, the third gear 10 is fixedly connected to the output end of the second clutch 5 through the first transmission shaft, and the fourth gear 11 is fixedly connected to the first wheel 6 through the second transmission shaft. A through hole for the first transmission shaft to pass through is set at the center of the second gear 9.

[0051] In an embodiment of the present invention, when the dual-motor four-wheel drive hybrid system operates in the extended-range mode, the engine 3 drives the first motor 1 to operate, and the first transmission mechanism serves as a range extender of the engine 3. The speed increase ratio of the first transmission mechanism is 2.5 to 3.5, which can adapt to high-speed motors and improve system performance.

[0052] In the embodiment of the present invention, the second transmission mechanism plays a deceleration role, and the reduction ratio of the second transmission mechanism is 3.5-4.5. When the vehicle runs at medium and high speeds, the engine 3 can be in a high efficiency range.

[0053] In an embodiment of the present invention, when the dual-motor four-wheel drive hybrid system operates in the pure electric four-wheel drive mode, the first motor 1 and the second motor 2 operate simultaneously to provide driving force for driving the vehicle, and the first transmission mechanism and the second transmission mechanism play a deceleration role. The reduction ratio of the first motor 1 can cover 9 to 15, effectively improving the driving ability of the first motor 1.

[0054] In the embodiment of the present invention, Figures 1 to 5 As shown, the third transmission mechanism includes a first gear group 8 and a second gear group 9 connected to each other. The first gear group 8 is connected to the second motor 2 , and the second gear group 9 is connected to the second gear 9 .

[0055] In the embodiment of the present invention, Figures 1 to 5As shown, the first gear 8 group includes a fifth gear 12 and a sixth gear 13 that are meshed with each other, the fifth gear 12 is connected to the second motor 2, and the sixth gear 13 is connected to the second gear 9 group. The diameter of the fifth gear 12 is smaller than the diameter of the sixth gear 13, and the axis of the fifth gear 12 is parallel to the axis of the sixth gear 13. The fifth gear 12 is fixedly connected to the output end of the second motor 2.

[0056] In the embodiment of the present invention, Figures 1 to 5 As shown, the second gear 9 group includes a meshing seventh gear 14 and an eighth gear 15, the seventh gear 14 is connected to the sixth gear 13, and the eighth gear 15 is connected to the second wheel 7. The diameter of the seventh gear 14 is smaller than the diameter of the eighth gear 15, and the axis of the seventh gear 14 is parallel to the axis of the eighth gear 15. The sixth gear 13 is fixedly connected to the seventh gear 14 through the third transmission shaft, and the sixth gear 13 and the seventh gear 14 rotate synchronously. The eighth gear 15 is fixedly connected to the second wheel 7 through the fourth transmission shaft, and the fourth transmission shaft is parallel to the third transmission shaft.

[0057] In the embodiment of the present invention, the first wheel 6 is the front wheel of the vehicle, the second wheel 7 is the rear wheel of the vehicle, and the axis of the first wheel 6 is parallel to the axis of the second wheel 7. The hybrid transmission composed of the engine 3, the clutch, the first motor 1, the reduction gear, etc. on the front axle only needs two sets of gears to realize torque transmission, and has a simple structure and high efficiency.

[0058] The engine 3, the dual clutch, and the first motor 1 provide the front axle driving torque, and the second motor 2 provides the rear axle driving torque. Through the coordinated control of various components, the pure electric mode, the extended range mode, and the parallel drive mode can be realized.

[0059] In a second aspect, an embodiment of the present invention further provides a control method for a dual-motor four-wheel drive hybrid system, comprising:

[0060] When the dual-motor four-wheel drive hybrid system works in pure electric mode, the dual clutch is in a disengaged state, and the second motor 2 is running to provide driving force for the vehicle to travel;

[0061] When the dual-motor four-wheel drive hybrid system works in the extended-range mode, the engine 3 drives the first motor 1 to operate, the first motor 1 generates electricity, and the second motor 2 operates to provide driving force for driving the vehicle;

[0062] When the dual-motor four-wheel drive hybrid system operates in parallel mode, the engine 3 provides driving force for driving the vehicle, and the second motor 2 adjusts the working point of the engine 3.

[0063] like Figure 2As shown, when the vehicle starts, the power battery is fully charged and the wheel-end torque demand is small, the dual-motor four-wheel drive hybrid system can operate in pure electric mode. At this time, the dual clutch is disengaged (the first clutch 4 and the second clutch 5 are in a disengaged state), and the second motor 2 is running to provide driving force for driving the vehicle. The vehicle is driven by the second motor 2 alone, and the second motor 2 drives the second wheel 7 to rotate. At this time, it is a pure electric two-wheel drive mode.

[0064] like Figure 3 As shown, when the wheel-end torque demand is large, the first clutch 4 switches to the engaged state and the second clutch 5 is in the disengaged state. At this time, the dual-motor four-wheel drive hybrid system operates in the pure electric four-wheel drive mode, and the vehicle is driven by the first motor 1 and the second motor 2. At this time, the first motor 1 acts as a drive motor and is in the drive mode. The first motor 1 and the second motor 2 simultaneously provide driving force to drive the vehicle. The first motor 1 drives the first wheel 6 to rotate, and the second motor 2 drives the second wheel 7 to rotate.

[0065] like Figure 4 As shown, when the power battery is low or the vehicle requires a large amount of power, the dual-motor four-wheel drive hybrid system can work in the extended-range mode, the first clutch 4 is in the engaged state, the second clutch 5 is in the disengaged state, the first motor 1 starts the engine 3, and the vehicle enters the extended-range mode. After the engine 3 is started, the engine 3 drives the first motor 1 to generate electricity, and the second motor 2 is responsible for driving the vehicle. The second motor 2 provides the driving force for driving the vehicle, and the second motor 2 drives the second wheel 7 to rotate. At this time, the first motor 1 acts as a generator and is in the power generation mode.

[0066] like Figure 5 As shown, when the vehicle speed enters the high efficiency zone of the engine 3 and the vehicle runs relatively smoothly, the dual-motor four-wheel drive hybrid system can work in parallel mode, the first clutch 4 and the second clutch 5 are both in the engaged state, and the vehicle is driven by the engine 3 and the second motor 2. The engine 3 drives the first wheel 6 to rotate, and the second motor 2 drives the second wheel 7 to rotate. In addition, the engine 3 is mainly responsible for vehicle driving at this time, and the second motor 2 is responsible for torque compensation to maintain the engine 3 running in the high efficiency zone.

[0067] In a third aspect, an embodiment of the present invention further provides a vehicle, including a dual-motor four-wheel drive hybrid power system of the above structure. The specific structure of the dual-motor four-wheel drive hybrid power system can be referred to Figures 1 to 5 Since the vehicle of the embodiment of the present invention includes the dual-motor four-wheel drive hybrid power system in the above embodiment, it has all the advantages of the dual-motor four-wheel drive hybrid power system.

[0068] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. Dual-motor four-wheel drive hybrid system, characterized in that: It includes an engine, a first motor, a second motor, a dual clutch connected to the engine, a first transmission mechanism connected to the first motor and the dual clutch, a second transmission mechanism connected to the dual clutch and the first wheel, and a third transmission mechanism connected to the second motor and the second wheel.

2. The dual-motor four-wheel drive hybrid system according to claim 1, characterized in that: The dual clutch includes a first clutch and a second clutch, the first clutch and the second clutch are connected to the output end of the engine, the first clutch is connected to the first transmission mechanism, and the second clutch is connected to the first transmission mechanism and the second transmission mechanism.

3. The dual-motor four-wheel drive hybrid system according to claim 2, characterized in that: When the first clutch is in the engaged state, the engine drives the first motor to operate through the first transmission mechanism, and the first motor generates electricity.

4. The dual-motor four-wheel drive hybrid system according to claim 2, characterized in that: When the second clutch is in a engaged state, the first motor drives the first wheel to rotate through the first transmission mechanism and the second transmission mechanism.

5. The dual-motor four-wheel drive hybrid power system according to any one of claims 1 to 4, characterized in that: The first transmission mechanism includes a first gear and a second gear that are meshed with each other, the first gear is connected to the first motor, and the second gear is connected to the dual clutch.

6. The dual-motor four-wheel drive hybrid power system according to any one of claims 1 to 4, characterized in that: The second transmission mechanism includes a third gear and a fourth gear that are meshed with each other, the third gear is connected to the dual clutch, and the fourth gear is connected to the first wheel.

7. The dual-motor four-wheel drive hybrid power system according to any one of claims 1 to 4, characterized in that: The third transmission mechanism includes a first gear set and a second gear set connected to each other, the first gear set is connected to the second motor, and the second gear set is connected to the second gear.

8. The dual-motor four-wheel drive hybrid system according to claim 7, characterized in that: The first gear set includes a fifth gear and a sixth gear that are meshed with each other, the fifth gear is connected to the second motor, and the sixth gear is connected to the second gear set.

9. The dual-motor four-wheel drive hybrid system according to claim 8, characterized in that: The second gear set includes a seventh gear and an eighth gear that are meshed with each other, the seventh gear is connected to the sixth gear, and the eighth gear is connected to the second wheel.

10. The control method of a dual-motor four-wheel drive hybrid system according to any one of claims 1 to 9, characterized in that: include: When the dual-motor four-wheel drive hybrid system operates in pure electric mode, the dual clutch is in a disengaged state, and the second motor operates to provide driving force for the vehicle to travel; When the dual-motor four-wheel drive hybrid system operates in the extended-range mode, the engine drives the first motor to operate, the first motor generates electricity, and the second motor operates to provide driving force for driving the vehicle; When the dual-motor four-wheel drive hybrid power system operates in parallel mode, the engine provides driving force for driving the vehicle, and the second motor adjusts the engine operating point.

11. A vehicle comprising the dual-motor four-wheel drive hybrid power system according to any one of claims 1 to 9.

Images