Power system and vehicle

Abstract

According to the power system and the vehicle, the double-motor design is adopted, the first motor and the second motor are in transmission connection with the input shaft and the output shaft through the first transmission link and the second transmission link respectively, and the first transmission link and the second transmission link are the same in structure and can be independently regulated and controlled. According to the power system and the vehicle, the double motors are arranged, the problem that the cost of performance improvement of the tail end of a single motor is higher can be effectively avoided, the performance of the power system can be effectively improved under the condition of low cost improvement, and by independently regulating and controlling the working states of the first transmission link and the second transmission link, the performance of the power system can be effectively improved. The input and output states of the first motor and the second motor are respectively regulated and controlled, so that the input combination of the first motor and the second motor in energy storage recovery and power output can be flexibly regulated, the energy storage recovery power and the output power of the system are flexibly regulated, and the coordination requirements of power battery energy storage management and various output powers are conveniently realized; and the manageability of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power, and in particular to a power system and a vehicle. Background Art

[0002] In order to meet the requirements of the national dual-carbon policy, it is imperative to reduce automobile fuel consumption and exhaust emissions. Electric vehicles and hybrid vehicles have become a trend. Under current technical conditions, end customers still have great mileage anxiety about pure electric vehicles. Extended-range hybrid vehicles have become the preferred route to reduce carbon emissions and eliminate mileage anxiety. Extended-range hybrid vehicles can have multiple driving modes, including pure electric, series-parallel, energy recovery, etc. According to the vehicle's driving conditions, the vehicle controller can select the best driving mode to achieve the purpose of saving fuel, reducing emissions and ensuring mileage.

[0003] Electric motors are generally better than internal combustion engines in terms of acceleration and climbing ability. However, in the existing extended-range system, some end customers have increasingly higher requirements for the vehicle's acceleration and climbing ability. At the same time, the vehicle's off-road capability, high vehicle speed and high motor speed also put forward higher requirements for system reliability, which increases the demand for improved motor performance. However, the cost of improving motor performance is nonlinear, the cost of improving terminal performance is higher, the degree of performance improvement is also limited, and it will reduce the price competitiveness of the vehicle, which is not conducive to the development of extended-range vehicles. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a power system and a vehicle to solve the problem that the cost of improving the performance of the motor terminal is higher, the performance improvement is limited, and it is not conducive to the development of extended-range vehicles.

[0005] In one aspect, the present invention provides a power system, including an engine, a first motor, a second motor and a power battery, wherein:

[0006] The engine is connected to the input shaft by driving, the first motor and the second motor are connected to the power battery through an inverter, the first motor and the second motor are connected to the output shaft by driving through a first transmission link and a second transmission link respectively, the first transmission link and the second transmission link have the same structure, and the output shaft is connected to the differential by driving;

[0007] The first transmission chain includes a first motor output gear fixedly arranged on the first motor output shaft of the first motor, a first duplex gear rotatably arranged on the input shaft, a first input shaft synchronizer fixedly arranged on the input shaft, a first driven gear rotatably arranged on the output shaft, and a first output shaft synchronizer fixedly arranged on the output shaft, and two gear structures of the first duplex gear are respectively meshed and connected with the first motor output gear and the first driven gear;

[0008] Wherein, when the first transmission link is in the energy storage transmission state, the first input shaft synchronizer is meshed and connected with the first double gear, and the first output shaft synchronizer is unloaded, so as to convert the output power of the engine into electrical energy and store it in the power battery;

[0009] When the first transmission link is in the output transmission state, the first input shaft synchronizer is unloaded, and the first output shaft synchronizer is meshedly connected with the first double gear to convert the electrical energy of the power battery into mechanical energy and transmit it to the output shaft.

[0010] Optionally, the power system includes a single-drive single-charge mode, in which one of the first transmission link and the second transmission link is in an energy storage transfer state, and the other is in an output transfer state.

[0011] Optionally, the power system further includes a dual-motor drive mode, in which the first transmission link and the second transmission link are both in an output transmission state.

[0012] Optionally, the power system further includes a single-motor drive mode, in which one of the first transmission link and the second transmission link is in an output transmission state, and the other is in a no-load state.

[0013] Optionally, the power system further includes a single-motor charging mode, in which one of the first transmission link and the second transmission link is in an energy storage and transfer state, and the other is in a no-load state.

[0014] Optionally, the power system further includes a fast charging mode, in which the first transmission link and the second transmission link are both in an energy storage and transfer state.

[0015] Optionally, the power system also includes a dual-motor drive mode. In the dual-motor drive mode, the first transmission link and the second transmission link are both in an output transfer state. The dual-motor drive mode is also used for motor function switching in the single drive single charging mode.

[0016] Optionally, the motor efficiencies of the first motor and the second motor are different from each other.

[0017] Optionally, the first motor and the second motor are arranged on the same side of the input shaft, the output shaft is arranged on the other side of the input shaft, and the first motor output shaft of the first motor and the second motor output shaft of the second motor are arranged opposite to each other;

[0018] The inverter includes a first inverter circuit and a second inverter circuit. One side of the first inverter circuit and the second inverter circuit is connected to the first motor and the second motor respectively, and the other side is connected in parallel to the power battery.

[0019] The present invention also provides a vehicle, comprising the above-mentioned power system.

[0020] The power system provided by the present invention includes an engine, a first motor, a second motor and a power battery, wherein the engine is drivingly connected to the input shaft, the first motor and the second motor are respectively connected to the power battery through an inverter, the first motor and the second motor are respectively drivingly connected to the output shaft through a first transmission link and a second transmission link, the first transmission link and the second transmission link have the same structure, and the output shaft is drivingly connected to the differential; the first transmission link includes a first motor output gear fixedly arranged on the first motor output shaft of the first motor, a first double gear rotatably arranged on the input shaft, a first input shaft synchronizer fixedly arranged on the input shaft, a first driven gear rotatably arranged on the output shaft, and a first output shaft synchronizer fixedly arranged on the output shaft, and the two gear structures of the first double gear are respectively meshed and connected with the first motor output gear and the first driven gear. The power system of the present invention is provided with dual motors, which can effectively avoid the problem of higher cost for improving the performance of a single motor terminal, and can effectively improve the performance of the power system at a lower cost. Moreover, the working states of the first transmission link and the second transmission link can be independently regulated to achieve separate regulation of the input and output states of the first motor and the second motor, thereby flexibly adjusting the input combination of the first motor and the second motor in energy storage recovery and power output, flexibly adjusting the system energy storage recovery power and output power, facilitating the coordination of power battery energy storage management and multiple output powers, and improving the manageability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the structure of a power system in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of an output path of a power system in an output state in an embodiment of the present invention.

[0023] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" 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", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are 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.

[0027] To solve the problem that the cost of improving the performance of the motor terminal is higher, the degree of performance improvement is limited, and it is not conducive to the development of extended-range vehicles. The present invention provides a power system, which adopts a dual-motor design, wherein the first motor and the second motor are respectively connected to the input shaft and the output shaft through the first transmission link and the second transmission link, and the first transmission link and the second transmission link have the same structure and can be independently regulated. The dual-motor design can effectively avoid the problem of higher cost of improving the performance of the single motor terminal, and can effectively improve the performance of the power system at a lower cost. The working states of the first transmission link and the second transmission link can be independently regulated to achieve the separate regulation of the input and output states of the first motor and the second motor, and then the input combination of the first motor and the second motor in energy storage recovery and power output can be flexibly adjusted, and the system energy storage recovery power and output power can be flexibly adjusted, which is convenient for realizing the coordination requirements of power battery energy storage management and multiple output powers, and improving the manageability of the system.

[0028] Specifically, Figure 1 and Figure 2 As shown, the power part of the power system of this embodiment includes an engine 3, a first motor 41, a second motor 42 and a power battery 1, wherein the engine 3 is transmission-connected to the input shaft 110, the first motor 41 and the second motor 42 are connected to the power battery 1 through the inverter 2, the first motor 41 and the second motor 42 are transmission-connected to the input shaft 110 and the output shaft 120 through the first transmission link and the second transmission link respectively, the structures of the first transmission link and the second transmission link are the same, the output shaft 120 is transmission-connected to the differential 7, and the output power of the engine 3, the first motor 41 and the second motor 42 can be transmitted to the output shaft 120 through the first transmission link and the second transmission link.

[0029] The first transmission chain includes a first motor output gear 51 fixedly arranged on the first motor output shaft of the first motor 41, a first duplex gear 52 rotatably arranged on the input shaft 110, a first input shaft synchronizer 111 fixedly arranged on the input shaft 110, a first driven gear 53 rotatably arranged on the output shaft 120, and a first output shaft synchronizer 121 fixedly arranged on the output shaft 120. The two gear structures of the first duplex gear 52 are respectively meshed and connected with the first motor output gear 51 and the first driven gear 53, so that the first motor output gear 51, the first duplex gear 52 and the first driven gear 53 are always connected. By controlling the first input shaft synchronizer 111 and the first output shaft synchronizer 121, the transmission connection state of the first motor 41 and the input shaft 110 and the output shaft 120 can be controlled, thereby controlling the working state of the system.

[0030] Specifically, when the first transmission link is in the energy storage and transmission state, the first input shaft synchronizer 111 is meshed and connected with the first double gear 52, and the first output shaft synchronizer 121 is unloaded, so that the output power of the engine 3 can be transmitted to the first motor 41. The first motor 41 is used as a generator, and the output electrical energy is converted into direct current through the inverter 2 to charge the power battery 1, so that the output power of the engine 3 can be converted into electrical energy and stored in the power battery 1.

[0031] When the first transmission link is in the output transmission state, the first input shaft synchronizer 111 is unloaded, and the first output shaft synchronizer 121 is meshed and connected with the first double gear 52 to convert the electrical energy of the power battery 1 into mechanical energy and transmit it to the output shaft 120. The output shaft 120 then transmits the rotation of the output shaft 120 to the differential 7 through the output gear set 103. The differential 7 is connected to the wheels to achieve power output.

[0032] The second transmission chain includes a second motor output gear 61 fixedly arranged on the second motor output shaft of the second motor 42, a second double gear 62 rotatably arranged on the input shaft 110, a second input shaft synchronizer 112 fixedly arranged on the input shaft 110, a second driven gear 63 rotatably arranged on the output shaft 120, and a second output shaft synchronizer 122 fixedly arranged on the output shaft 120. The two gear structures of the second double gear 62 are respectively meshed and connected with the second motor output gear 61 and the second driven gear 63, so that the second motor output gear 61, the second double gear 62 and the second driven gear 63 are always connected. By controlling the second input shaft synchronizer 112 and the second output shaft synchronizer 122, the transmission connection state of the second motor 42 and the input shaft 110 and the output shaft 120 can be controlled, thereby controlling the working state of the system.

[0033] Specifically, when the second transmission link is in the energy storage and transmission state, the second input shaft synchronizer 112 is meshed and connected with the second double gear 62, and the second output shaft synchronizer 122 is unloaded, so that the output power of the engine 3 can be transmitted to the second motor 42. The second motor 42 is used as a generator, and the output electrical energy is converted into direct current through the inverter 2 to charge the power battery 1, so that the output power of the engine 3 can be converted into electrical energy and stored in the power battery 1.

[0034] When the second transmission link is in the output transmission state, the second input shaft synchronizer 112 is unloaded, and the second output shaft synchronizer 122 is meshed and connected with the second double gear 62 to convert the electrical energy of the power battery 1 into mechanical energy and transmit it to the output shaft 120. The output shaft 120 then transmits the rotation of the output shaft 120 to the differential 7 through the output gear set 103. The differential 7 is connected to the wheels to achieve power output.

[0035] The power system of this embodiment mainly uses the motor as the output drive, and correspondingly includes a single drive single charging mode. In the single drive single charging mode, one of the first transmission link and the second transmission link is in the energy storage transfer state, and the other is in the output transfer state, for example, Figure 2 As shown, the first transmission link is in the energy storage transfer state, and the second transmission link is in the output transfer state. The output power of the engine 3 is first converted into electrical energy through the first transmission link and the first motor 41. The converted electrical energy can be stored in the power battery 1. The obtained electrical energy is then converted into mechanical energy through the second motor 42, and then transmitted to the output shaft 120 for output through the second transmission link.

[0036] The power system also includes a dual-motor drive mode. In the dual-motor drive mode, the first transmission link and the second transmission link are both in output transmission state, and the first motor 41 and the second motor 42 both draw power from the power battery 1. The system has high output power and large output torque, which is suitable for the needs of high acceleration and high climbing ability.

[0037] When driving at a low speed on a flat road, the power demand is relatively low. Correspondingly, a single-motor drive mode is also included. In the single-motor drive mode, one of the first transmission link and the second transmission link is in an output transmission state, and the other is in a no-load state (both synchronizers are no-loaded). One of the first motor 41 and the second motor 42 is running, and the other is on standby. The single motor outputs, and the overall low-power operation and low power consumption can reduce energy waste and improve vehicle endurance.

[0038] When the vehicle is temporarily parked and on standby, the idle motor can be used to charge the power battery 1. Correspondingly, a single-motor charging mode is also included. In the single-motor charging mode, one of the first transmission chain and the second transmission chain is in an energy storage and transfer state, and the other is in an unloaded state. The power battery 1 can be charged according to the output power of the engine 3.

[0039] In order to reduce the charging time, a fast charging mode is also included. In the fast charging mode, the first transmission link and the second transmission link are both in the energy storage transfer state, and the first motor 41 and the second motor 42 are used as generators at the same time. The total power generation power is large. When the power battery 1 is low in power, the fast charging mode can be enabled to quickly replenish the power of the power battery 1 and reduce the charging time.

[0040] To match different power requirements, in this embodiment, the motor efficiencies of the first motor 41 and the second motor 42 are different from each other. By adjusting the energy storage and output input methods of the first motor 41 and the second motor 42, the energy storage and output ratio of the system can be adjusted, and the charging power and output power of the power battery 1 can be flexibly adjusted.

[0041] In the single-drive single-charge mode, motors of different powers are selected as generators. The power generation and output power are different. When the output power is low, a motor with higher power can be selected as a generator and a motor with lower power can be selected as an output motor; when the output power is high, a motor with higher power can be selected as an output motor and a motor with lower power can be selected as a generator. The actual demand changes in real time, and correspondingly, it is necessary to switch between various modes. Specifically, for example, in the single-drive single-charge mode, the power generation and output functions of the two motors are switched. The dual-motor drive mode can be used as an intermediate state. Two operation actions are performed successively to complete the switching. A single operation action only needs to switch the state of one synchronizer. The execution reliability and effectiveness are high, which is convenient for the management of system mode switching.

[0042] Among them, in order to adapt to dual motors of different powers, the speed ratio of each gear set in the first transmission chain and the second transmission chain can be flexibly selected according to specific needs. For example, in this embodiment, the output speed ratio of the first motor output gear 51 to the first double gear 52 is smaller than the output speed ratio of the second motor output gear 61 to the second double gear 62.

[0043] To facilitate layout, in the present embodiment, the first motor 41 and the second motor 42 are arranged on the same side of the input shaft 110, and the output shaft 120 is arranged on the other side of the input shaft 110. The first motor output shaft of the first motor 41 and the second motor output shaft of the second motor 42 are arranged relatively to each other, and the layout of the first transmission link and the second transmission link are translationally symmetrical, and the synchronization operation directions of the first input shaft synchronizer 111 and the first output shaft synchronizer 121 that mesh with the corresponding gears are opposite.

[0044] The inverter 2 includes a first inverter circuit and a second inverter circuit, one side of the first inverter circuit and the second inverter circuit are connected to the first motor 41 and the second motor 42 respectively, and the other side is connected in parallel to the power battery 1. In the single drive and single charge mode, the recovered and converted electric energy can directly drive the output motor, or two sets of cables are used to connect to the power battery 1 respectively. The power battery 1 is generally a battery pack structure.

[0045] The present invention also provides a vehicle, including the above-mentioned power system, whose dual-motor design can effectively avoid the problem of higher cost of improving the performance of a single motor terminal, and can effectively improve the performance of the power system at a lower cost. Moreover, the working states of the first transmission link and the second transmission link can be independently regulated to achieve separate regulation of the input and output states of the first motor and the second motor, thereby flexibly adjusting the input combination of the first motor and the second motor in energy storage recovery and power output, flexibly adjusting the system energy storage recovery power and output power, facilitating the coordination of power battery energy storage management and multiple output powers, improving the manageability of the system, and thereby achieving an efficient range-extended design of the vehicle at a lower cost, thereby improving the market competitiveness of the vehicle.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] The above-mentioned embodiments only express several specific implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A power system, characterized in that: It includes an engine, a first motor, a second motor and a power battery, wherein: The engine is connected to the input shaft by driving, the first motor and the second motor are connected to the power battery through an inverter, the first motor and the second motor are connected to the output shaft by driving through a first transmission link and a second transmission link respectively, the first transmission link and the second transmission link have the same structure, and the output shaft is connected to the differential by driving; The first transmission chain includes a first motor output gear fixedly arranged on the first motor output shaft of the first motor, a first duplex gear rotatably arranged on the input shaft, a first input shaft synchronizer fixedly arranged on the input shaft, a first driven gear rotatably arranged on the output shaft, and a first output shaft synchronizer fixedly arranged on the output shaft, and two gear structures of the first duplex gear are respectively meshed and connected with the first motor output gear and the first driven gear; Wherein, when the first transmission link is in the energy storage transmission state, the first input shaft synchronizer is meshed and connected with the first double gear, and the first output shaft synchronizer is unloaded, so as to convert the output power of the engine into electrical energy and store it in the power battery; When the first transmission link is in the output transmission state, the first input shaft synchronizer is unloaded, and the first output shaft synchronizer is meshedly connected with the first double gear to convert the electrical energy of the power battery into mechanical energy and transmit it to the output shaft.

2. The power system according to claim 1, characterized in that: The power system includes a single-drive single-charge mode. In the single-drive single-charge mode, one of the first transmission link and the second transmission link is in an energy storage transmission state, and the other is in an output transmission state.

3. The power system according to claim 1, characterized in that: The power system further includes a dual-motor driving mode, in which the first transmission link and the second transmission link are both in an output transmission state.

4. The power system according to claim 1, characterized in that: The power system further includes a single-motor driving mode, in which one of the first transmission link and the second transmission link is in an output transmission state, and the other is in a no-load state.

5. The power system according to claim 1, characterized in that: The power system also includes a single-motor charging mode. In the single-motor charging mode, one of the first transmission link and the second transmission link is in an energy storage and transmission state, and the other is in a no-load state.

6. The power system according to claim 1, characterized in that: The power system also includes a fast charging mode, in which the first transmission link and the second transmission link are both in an energy storage and transmission state.

7. The power system according to claim 2, characterized in that: The power system also includes a dual-motor drive mode. In the dual-motor drive mode, the first transmission link and the second transmission link are both in an output transmission state. The dual-motor drive mode is also used for motor function switching in the single drive single charging mode.

8. The power system according to any one of claims 1 to 7, characterized in that: Motor efficiencies of the first motor and the second motor are different from each other.

9. The power system according to claim 1, characterized in that: The first motor and the second motor are arranged on the same side of the input shaft, the output shaft is arranged on the other side of the input shaft, and the first motor output shaft of the first motor and the second motor output shaft of the second motor are arranged opposite to each other; The inverter includes a first inverter circuit and a second inverter circuit. One side of the first inverter circuit and the second inverter circuit is connected to the first motor and the second motor respectively, and the other side is connected in parallel to the power battery.

10. A vehicle, characterized in that: A power system comprising any one of claims 1 to 9.

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