Hybrid power system and vehicle

Abstract

The utility model provides a hybrid power system and a vehicle. The hybrid power system comprises a first motor, a second motor, an engine and a switching mechanism. The first motor is used for being connected with a first power shaft, and the second motor is electrically connected with the first motor; the engine is used for being connected with a second power shaft or the second motor through the switching mechanism and used for switching the hybrid power system to enter an engine direct drive mode or a range extending mode. According to the hybrid power system, only two motors are used in a four-wheel drive mode, one motor is omitted compared with the prior art, and the cost is greatly reduced; according to the hybrid power system, the engine direct drive mode or the range extending mode can be switched according to the actual working conditions, losses in the energy conversion process can be avoided, and the energy utilization efficiency under the working conditions is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hybrid power system technical field especially relates to a hybrid power system and vehicle. BACKGROUND

[0002] Current hybrid power system mainly adopts series, parallel or series-parallel hybrid driving architecture. Series architecture drives motor running through engine power generation, simple structure, but lacks direct drive mode, resulting in low energy efficiency when vehicle high-speed running. Parallel architecture drives through engine and motor, maximally retains traditional fuel vehicle power assembly architecture, good power, but complex structure, higher cost. Series-parallel hybrid architecture combines the advantages of both, but further increases the complexity and cost of the system.

[0003] In summary, the energy utilization efficiency of the existing hybrid power system is poor, and the cost is high. SUMMARY

[0004] The utility model provides a kind of hybrid power system and vehicle, to solve the energy utilization efficiency of the existing hybrid power system is poor, and the cost is high Problem.

[0005] A kind of hybrid power system, including first motor, second motor, engine and switching mechanism;

[0006] The first motor is used to connect first power shaft, and the second motor is electrically connected with the first motor;

[0007] The engine is connected with second power shaft or the second motor by the switching mechanism, for switching the hybrid power system into engine direct drive mode or range extending mode.

[0008] Preferably, the switching mechanism includes power output shaft, first gear assembly, second gear assembly and synchronizer;

[0009] The power output shaft is connected with the engine;

[0010] The first gear assembly and the second gear assembly are arranged on the power output shaft with interval;

[0011] The first gear assembly is connected with second motor, and the second gear assembly is used to connect second power shaft;

[0012] The synchronizer is arranged on the power output shaft, between the first gear assembly and the second gear assembly, for combining or disconnecting with the first gear assembly, and combining or disconnecting with the second gear assembly.

[0013] Preferably, the first gear assembly comprises a first driving gear and a first driven gear engaged with each other; the second gear assembly comprises a second driving gear and a second driven gear engaged with each other.

[0014] The first driven gear and the second driven gear are spaced apart on the power output shaft.

[0015] The first driving gear is connected to the second motor, and the second driving gear is used to connect the second power shaft.

[0016] Preferably, the hybrid power system further comprises an engine flywheel; the engine flywheel is arranged on the power output shaft and located between the engine and the second gear assembly.

[0017] Preferably, the hybrid power system further comprises a power battery.

[0018] The power battery is electrically connected to the first motor and the second motor.

[0019] Preferably, when the engine is stopped, the first motor is driven, the second motor is stopped, the synchronizer is not combined, and the hybrid power system is in an electric mode.

[0020] When the engine is working, the first motor is driven, the second motor is generating electricity, the synchronizer is combined with the first gear assembly, and the hybrid power system is in a series mode.

[0021] When the engine is working, the first motor is generating electricity / driven / following, the second motor is stopped, the synchronizer is combined with the second gear assembly, and the hybrid power system is in a parallel mode.

[0022] When the engine is disconnected, the first motor is driven, the second motor is disconnected, and the synchronizer is disconnected, the hybrid power system is in an energy recovery mode.

[0023] When the engine is working, the first motor is stopped, the second motor is generating electricity, the synchronizer is combined with the first gear assembly, and the hybrid power system is in a parking power generation mode.

[0024] Preferably, the hybrid power system further comprises a differential speed reducer.

[0025] The differential speed reducer is connected to the second gear assembly and used to connect the second power shaft.

[0026] A vehicle comprising a first power shaft, a second power shaft, and the hybrid power system.

[0027] The first motor of the hybrid system is connected with the first power shaft, and the switching mechanism of the hybrid system is connected with the second power shaft.

[0028] Preferably, the first power shaft and the second power shaft are arranged in parallel.

[0029] Preferably, the vehicle further comprises a power distribution unit and an integrated power unit; a first end of the power distribution unit is connected with the power battery;

[0030] A second end of the power distribution unit is connected with the first motor of the hybrid system through one integrated power unit and connected with the second motor of the hybrid system through another integrated power unit;

[0031] Further comprising an engine management system, a battery management system and a vehicle control unit; the engine management system is arranged on the engine;

[0032] The battery management system is arranged on the power battery; and the vehicle control unit is arranged between the engine management system and the integrated power unit.

[0033] The hybrid system provided by the embodiment of the utility model includes first motor, second motor, engine and switching mechanism, when installing, first motor is used for connecting first power shaft, first motor is drive motor, and power is provided to first power shaft, second motor is generator, and second motor is electrically connected with first motor, and generator can provide power to drive motor. The engine is used for being connected with the second power shaft or the second motor through the switching mechanism, and is used for switching the hybrid system to enter the engine direct drive mode or the range extending mode; in this way, when the hybrid system enters the engine direct drive mode, the engine is used for being connected with the second power shaft through the switching mechanism, at the moment, first motor provides power to first power shaft, and the engine provides power to second power shaft, and the vehicle is four-wheel drive mode; when the hybrid system enters the range extending mode, the engine is used for being connected with the second motor through the switching mechanism, at the moment, only first motor provides power to first power shaft, and the engine provides power to second motor, and second motor generates electricity, can provide power to first motor, and the vehicle is two-wheel drive mode. Only two motors are used in four-wheel drive mode, compared with prior art, one is less, and cost is greatly reduced; and the hybrid system can switch the engine direct drive mode or the range extending mode according to actual working conditions, in some working conditions (such as high-speed driving of vehicle, large load climbing), the working condition point corresponding to the engine is already in the high fuel efficiency area, at the moment, the engine direct drive will avoid the process that mechanical energy is converted into electric energy through the generator and then converted into mechanical energy through the drive motor in the range extending mode, which will avoid the loss in the energy conversion process, and improve the energy utilization efficiency under these working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0035] Figure 1 is a connection diagram of a hybrid power system in an embodiment of the present application;

[0036] Figure 2 is a working mode table of the hybrid power system in an embodiment of the present application.

[0037] 1, first motor; 2, second motor; 3, engine; 4, switching mechanism; 41, power output shaft; 42, first gear assembly; 421, first loose gear; 422, first transmission gear; 43, second gear assembly; 431, second loose gear; 432, second transmission gear; 44, synchronizer; 5, first power shaft; 6, second power shaft; 7, engine flywheel; 8, power battery; 9, differential reducer; 10, electric power distribution unit; 11, integrated electric power unit; 12, engine management system; 13, battery management system; 14, vehicle control unit. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical schemes and beneficial effects solved by the present application more clear, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0039] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For the ordinary skill in the art, the above-mentioned terms can be understood in the specific meaning of the utility model according to specific circumstances.

[0041] The utility model embodiment provides a kind of hybrid power system, refer to Figure 1 The hybrid power system includes first motor 1, second motor 2, engine 3 and switching mechanism 4;First motor 1 is used to connect first power shaft 5, second motor 2 is electrically connected with first motor 1;Engine 3 is connected with second motor 2 or second power shaft 6 by switching mechanism 4, for switching hybrid power system enters engine direct drive mode or range extending mode.

[0042] As an example, hybrid power system is used to provide power for first power shaft 5 and / or second power shaft 6, to realize front drive and / or rear drive.The hybrid power system specifically includes first motor 1, second motor 2, engine 3 and switching mechanism 4;When installing, first motor 1 is used to connect first power shaft 5, and first motor 1 is drive motor, provides power for first power shaft 5;Second motor 2 is generator, and second motor 2 is electrically connected with first motor 1, and generator can provide power for drive motor.Engine 3 is used to be connected with second power shaft 6 or second motor 2 by switching mechanism 4, for switching hybrid power system enters engine direct drive mode or range extending mode;In this way, when hybrid power system enters engine direct drive mode, engine 3 is connected with second power shaft 6 by switching mechanism 4, first motor 1 provides power for first power shaft 5 at this time, and engine 3 provides power for second power shaft 6, and vehicle is four-wheel drive mode;When hybrid power system enters range extending mode, engine 3 is connected with second motor 2 by switching mechanism 4, only first motor 1 provides power for first power shaft 5 at this time, and engine 3 provides power for second motor 2, and second motor 2 generates electricity, can provide power for first motor 1, and vehicle is two-wheel drive mode.

[0043] The hybrid system in the example uses only two motors in four-wheel drive mode, one less than the prior art, greatly reducing the cost. The mechanical power output by the engine 3 in the prior art cannot be directly used to drive the vehicle. The hybrid system in the example can switch between engine direct drive mode and range extending mode according to the actual working conditions. In some working conditions (such as high-speed driving and heavy load climbing), the engine 3 is already in the high fuel efficiency region. At this time, engine direct drive will avoid the process of converting mechanical energy to electrical energy through the generator and then to mechanical energy through the drive motor in the range extending mode. This will avoid the loss in the energy conversion process and improve the energy utilization efficiency in these working conditions.

[0044] In an embodiment, referring to Figure 1 The switching mechanism 4 includes a power output shaft 41, a first gear assembly 42, a second gear assembly 43, and a synchronizer 44. The power output shaft 41 is connected to the engine 3. The first gear assembly 42 and the second gear assembly 43 are arranged on the power output shaft 41. The first gear assembly 42 is connected to the second motor 2, and the second gear assembly 43 is used to connect the second power shaft 6. The synchronizer 44 is arranged on the power output shaft 41 between the first gear assembly 42 and the second gear assembly 43, and is used to combine or disconnect the first gear assembly 42 and the second gear assembly 43.

[0045] As an example, the switching mechanism 4 is used to distribute the power transmitted by the engine 3 to switch the power output path of the engine 3, so as to realize switching the hybrid power system into the engine direct drive mode or the extended range mode. The switching mechanism 4 comprises a power output shaft 41, a first gear assembly 42, a second gear assembly 43 and a synchronizer 44; when installed, the power output shaft 41 is connected with the engine 3, the first gear assembly 42 and the second gear assembly 43 are arranged on the power output shaft 41 in a spaced manner, the first gear assembly 42 is connected with the second motor 2, and the second gear assembly 43 is used to be connected with the second power shaft 6. The synchronizer 44 is arranged on the power output shaft 41 between the first gear assembly 42 and the second gear assembly 43, and the synchronizer 44 can be combined or disconnected with the first gear assembly 42 and the second gear assembly 43; when the synchronizer 44 is combined with the first gear assembly 42 and disconnected with the second gear assembly 43, the power on the power output shaft 41 can drive the second motor 2 to work through the first gear assembly 42 to realize power generation; when the synchronizer 44 is disconnected with the first gear assembly 42 and combined with the second gear assembly 43, the power on the power output shaft 41 can be transmitted to the second power shaft 6 through the second gear assembly 43 to make the second power shaft 6 rotate; when the synchronizer 44 is disconnected with the first gear assembly 42 and the second gear assembly 43, the power on the power output shaft 41 is not transmitted. In this way, only the position of the synchronizer 44 needs to be adjusted to be combined or disconnected with the first gear assembly 42 and the second gear assembly 43, so as to switch the power transmission path, simplify the transmission structure, and reduce the cost and maintenance difficulty.

[0046] In an embodiment, referring to Figure 1 , the first gear assembly 42 comprises a first loose gear 421 and a first transmission gear 422 engaged with each other; the second gear assembly 43 comprises a second loose gear 431 and a second transmission gear 432 engaged with each other; the first loose gear 421 and the second loose gear 431 are arranged on the power output shaft 41 in a spaced manner; the first transmission gear 422 is connected with the second motor 2, and the second transmission gear 432 is used to be connected with the second power shaft 6.

[0047] As an example, the first gear assembly 42 comprises a first loose gear 421 and a first transmission gear 422; the second gear assembly 43 comprises a second loose gear 431 and a second transmission gear 432; when installed, the first loose gear 421 and the second loose gear 431 are arranged on the power output shaft 41 in a spaced manner, so that the loose gears can rotate with the power output shaft 41, thereby driving the transmission gears connected with the loose gears. The first transmission gear 422 is engaged with the first loose gear 421 and connected with the second motor 2, so as to facilitate the transmission of power on the power output shaft 41 to the first transmission gear 422 to drive the second motor 2 to generate electricity; the second transmission gear 432 is engaged with the second loose gear 431 and used for connecting the second power shaft 6, so as to facilitate the transmission of power on the power output shaft 41 to the second power shaft 6 to drive the second power shaft 6 to rotate, thereby realizing the rotation of the structure connected with the second power shaft 6 (for example, the wheels).

[0048] In an embodiment, referring to Figure 1 , the hybrid power system further comprises an engine flywheel 7; the engine flywheel 7 is arranged on the power output shaft 41 between the engine 3 and the second gear assembly 43.

[0049] As an example, the hybrid power system further comprises an engine flywheel 7; when installed, the engine flywheel 7 is installed on the power output shaft 41 between the engine 3 and the second gear assembly 43, and the engine flywheel 7 can effectively store energy and balance the rotating speed, thereby ensuring the balanced transmission of power between the engine 3 and the gear assembly, and providing important support for the smooth running and efficient operation of the vehicle.

[0050] In an embodiment, referring to Figure 1 , the hybrid power system further comprises a power battery 8; the power battery 8 is electrically connected with the first motor 1 and the second motor 2.

[0051] As an example, the hybrid system further comprises a power battery 8; when installed, the power battery 8 is electrically connected with the first motor 1 and the second motor 2, and connects the second motor 2 with the first gear assembly 42, and the first gear assembly 42 specifically comprises a first loose gear 421 and a first transmission gear 422, the first loose gear 421 is arranged on the power output shaft 41, and the first transmission gear 422 is engaged with the first loose gear 421 and is used to be connected with the second motor 2, so as to facilitate the power transmission on the power output shaft 41 to the second motor 2, so that the second motor 2 generates electricity, and then the second motor 2 is electrically connected with the first motor 1, the second motor 2 can charge the power battery 8 or supply power to the first motor 1, and the first motor 1 drives the first power shaft 5 to rotate, so as to realize the rotation of the structure connected with the first power shaft 5 (such as a wheel). Specifically, high-voltage direct current is adopted between the power battery 8 and the first motor 1 and the second motor 2; in this way, by adjusting the position of the synchronizer 44, the first gear assembly 42 and the second gear assembly 43 are combined or disconnected, and the three driving modes of the hybrid system can be switched, and the three driving modes are referred to Figure 2 , specifically, the pure electric mode, the series mode and the parallel mode.

[0052] The series mode: the engine 3 drives the power output shaft 41 to rotate, and the synchronizer 44 is combined with the first gear assembly 42 to establish a transmission relationship with the second motor 2. In this mode, the speed of the engine 3 is decoupled from the vehicle speed, which can be controlled, and the operating speed and output power of the engine 3 are adjusted to operate at a suitable operating point. When the synchronizer 44 is combined with the first gear assembly 42 and disconnected from the second gear assembly 43, the power output by the engine 3 through the power output shaft 41 can be transmitted to the front second motor 2 through the first gear assembly 42, and converted into electric power by the second motor 2 and output to the first motor 1, and the first motor 1 drives the first power shaft 5. The first motor 1 outputs mechanical power according to the wheel end power demand, and when the electric power required by the first motor 1 is equal to the power generated by the second motor 2, the energy source of the first motor 1 is the second motor 2, and at this time, the power follows; when the electric power required by the first motor 1 is higher than the power generated by the second motor 2, the insufficient electric power is provided by the power battery 8, that is, the operating condition migrates to the discharge mode; when the electric power required by the first motor 1 is lower than the power generated by the second motor 2, the excess electric power enters the power battery 8 to convert into electrochemical energy, that is, the operating condition migrates to the power generation mode.

[0053] Parallel mode: the engine 3 drives the power output shaft 41 to rotate, and the power output shaft 41 is combined with the second gear assembly 43 through the synchronizer 44, and finally establishes a transmission relationship with the second power shaft 6 of the vehicle. In this mode, the speed of the engine 3 is determined by the vehicle speed, and the main control variable is the allocation of the wheel end demand torque between the engine 3 and the second motor 2. When the synchronizer 44 is disconnected from the first gear assembly 42 and combined with the second gear assembly 43, the power output by the engine 3 through the power output shaft 41 can be transmitted to the second power shaft 6 through the second gear assembly 43 to drive the second power shaft 6 to rotate; in this mode, the speed of the engine 3 is determined by the vehicle speed, and the main control variable is the allocation of the wheel end demand torque between the engine 3 and the first motor 1. When the output torque of the engine 3 is equal to the wheel end demand torque, the first motor 1 follows (0 torque control), that is, the engine drives directly; when the output torque of the engine 3 is less than the wheel end demand torque, the engine 3 drives the second power shaft 6 of the vehicle to rotate, and the first motor 1 drives the first power shaft 5 of the vehicle to rotate, that is, the working condition migration assist (four-wheel drive mode); when the output torque of the engine 3 is greater than the wheel end demand torque, the engine 3 drives the second power shaft 6 of the vehicle to rotate, and the first motor 1 brakes to recover energy, that is, the working condition migration power generation mode.

[0054] Pure electric mode: when the synchronizer 44 is disconnected from the first gear assembly 42 and disconnected from the second gear assembly 43, the power output by the engine 3 through the power output shaft 41 is not transmitted; at this time, the engine 3 and the second motor 2 are in the shutdown state, the synchronizer 44 is combined with the power output shaft 41, the first motor 1 obtains electric energy from the power battery 8 and converts it into mechanical energy to respond to the driving demand of the wheel end.

[0055] Current hybrid systems mainly adopt series, parallel or series-parallel hybrid configurations. Series configuration generates electricity by engine 3 and drives by first motor 1, which is simple in structure, but lacks direct drive mode, resulting in lower energy efficiency when the vehicle is running at high speed. Parallel configuration drives by engine 3 and first motor 1 together, which retains the powertrain configuration of traditional fuel vehicles to the greatest extent, and has good power performance, but is complex in structure and high in cost. Series-parallel hybrid configuration combines the advantages of the two, but further increases the complexity and cost of the system. The hybrid system in this example, based on series (extended range) hybrid configuration, only needs to adjust the position of synchronizer 44 to combine or disconnect with first gear assembly 42 and second gear assembly 43, to realize the switching between series mode and parallel mode of hybrid system, optimize the energy efficiency of hybrid system, and improve the energy efficiency of vehicle under different working conditions, especially at high speed. Compared with existing hybrid four-wheel drive configuration, the structure is more simple and compact, the mode is more abundant, the energy utilization efficiency is higher, and compared with existing extended range four-wheel drive configuration, one first motor 1 is reduced, single motor four-wheel drive function is realized, driving performance of vehicle is improved, and the cost of vehicle is reduced. In addition, compared with traditional series-parallel structure, the transmission mechanism is simplified, the cost and maintenance difficulty are reduced.

[0056] In an embodiment, referring to Figure 1 and Figure 2 When engine 3 is stopped, first motor 1 is driven, second motor 2 is stopped, and synchronizer 44 is not combined, the hybrid system is in pure electric mode; when engine 3 is working, first motor 1 is driven, second motor 2 is generating electricity, and synchronizer 44 is combined with first gear assembly 42, the hybrid system is in series mode; when engine 3 is working, first motor 1 is generating electricity / driving / following, second motor 2 is stopped, and synchronizer 44 is combined with second gear assembly 43, the hybrid system is in parallel mode; when engine 3 is disconnected, first motor 1 is driven, second motor 2 is disconnected, and synchronizer 44 is disconnected, the hybrid system is in energy recovery mode; when engine 3 is working, first motor 1 is stopped, second motor 2 is generating electricity, and synchronizer 44 is combined with first gear assembly 42, the hybrid system is in parking power generation mode.

[0057] As an example, in the hybrid power system, the switching between the series mode and the parallel mode of the hybrid power system can be realized by adjusting the position of the synchronizer 44 to combine or disconnect the first gear assembly 42 and the second gear assembly 43, thereby optimizing the energy efficiency of the hybrid power system and improving the energy efficiency of the vehicle under different working conditions, especially at high speed. The working modes of the hybrid power system are as follows: the pure electric mode is a mode in which the engine 3 is controlled to be stopped, the first motor 1 is driven, the second motor 2 is stopped, and the synchronizer 44 is not combined; the series mode is a mode in which the engine 3 is controlled to work, the first motor 1 is driven, the second motor 2 generates electricity, and the synchronizer 44 is combined with the first gear assembly 42; the parallel mode is a mode in which the engine 3 is controlled to work, the first motor 1 generates electricity / drives / follows, the second motor 2 is stopped, and the synchronizer 44 is combined with the second gear assembly 43; the energy recovery mode is a mode in which the engine 3 is controlled to be disconnected, the first motor 1 is driven, the second motor 2 is disconnected, and the synchronizer 44 is disconnected; and the parking power generation mode is a mode in which the engine 3 is controlled to work, the first motor 1 is stopped, the second motor 2 generates electricity, and the synchronizer 44 is combined with the first gear assembly 42. Among them, stopping is to completely stop the operation of the motor, including stopping generating electricity and connecting with the power battery 8; disconnecting is to cut off the electrical connection between the motor and the power battery 8, but the motor itself may still be running.

[0058] In an embodiment, with reference to Figure 1 , the hybrid power system further comprises a differential speed reducer 9; the differential speed reducer 9 is connected with the second gear assembly 43 and is used for connecting the second power shaft 6.

[0059] As an example, the hybrid power system further comprises a differential speed reducer 9; when installed, the differential speed reducer 9 is installed on the second power shaft 6 and connected with the second gear assembly 43, and specifically, the second gear assembly 43 comprises a second hollow gear 431 and a second transmission gear 432, the second hollow gear 431 is arranged on the power output shaft 41, the second transmission gear 432 is engaged with the second hollow gear 431 and is used for being connected with the differential speed reducer 9, and the differential speed reducer 9 is connected with the second power shaft 6, so as to facilitate the transmission of power on the power output shaft 41 to the differential speed reducer 9, and then the differential speed reducer 9 drives the second power shaft 6 to rotate, thereby realizing the rotation of the structure connected with the second power shaft 6 (for example, a wheel), so that the differential speed reducer 9 can flexibly distribute the torque output by the engine 3 to the left and right drive wheels, ensuring smooth driving of the vehicle. Among them, the second power shaft 6 comprises two half shafts, and the differential speed reducer 9 can ensure that the two half shafts rotate at different angular velocities.

[0060] The embodiment of the utility model provides a vehicle, with reference to Figure 1, comprising a first power shaft 5, a second power shaft 6 and a hybrid power system; the first motor 1 of the hybrid power system is connected with the first power shaft 5, and the switching mechanism 4 of the hybrid power system is connected with the second power shaft 6.

[0061] As an example, the vehicle comprises a first power shaft 5, a second power shaft 6 and a hybrid power system; the hybrid power system is used to power the first power shaft 5 and / or the second power shaft 6 to realize front drive and / or rear drive. The hybrid power system specifically comprises a first motor 1, a second motor 2, an engine 3 and a switching mechanism 4; when installed, the first motor 1 is connected with the first power shaft 5, the first motor 1 is a drive motor, and the first motor 1 is used to power the first power shaft 5; the second motor 2 is a generator, the second motor 2 is electrically connected with the first motor 1, and the generator can power the drive motor. The engine 3 is used to be connected with the second power shaft 6 or the second motor 2 through the switching mechanism 4, specifically, the first gear assembly 42 of the switching mechanism 4 is connected with the second motor 2, and the second gear assembly 43 is connected with the second power shaft 6, which is used to switch the hybrid power system into an engine direct drive mode or an extended range mode; in this way, when the hybrid power system enters the engine direct drive mode, the engine 3 is used to be connected with the second power shaft 6 through the switching mechanism 4, at this time, the first motor 1 powers the first power shaft 5, the engine 3 powers the second power shaft 6, and the vehicle is in four-wheel drive mode; when the hybrid power system enters the extended range mode, the engine 3 is used to be connected with the second motor 2 through the switching mechanism 4, at this time, only the first motor 1 powers the first power shaft 5, the engine 3 powers the second motor 2, the second motor 2 generates electricity, and the second motor 2 can power the first motor 1, and the vehicle is in two-wheel drive mode.

[0062] The hybrid power system in this example only uses two motors in four-wheel drive mode, which is one less than the prior art, and the cost is greatly reduced; in the prior art, the mechanical power output by the engine 3 cannot be directly used to drive the vehicle, and the hybrid power system in this example can switch the engine direct drive mode or the extended range mode according to the actual working condition, in some working conditions (such as high-speed driving of the vehicle and heavy load climbing), the working condition point corresponding to the engine 3 is already in the high fuel efficiency area, at this time, the engine direct drive will avoid the process of converting mechanical energy into electrical energy through the generator and then converting the electrical energy into mechanical energy through the drive motor in the extended range mode, which will avoid the loss in the energy conversion process and improve the energy utilization efficiency in these working conditions.

[0063] In an embodiment, referring to Figure 1 , the first power shaft 5 and the second power shaft 6 are arranged in parallel.

[0064] As an example, during installation, the first power shaft 5 and the second power shaft 6 are arranged in parallel, the first motor 1 is connected with the first power shaft 5, and the second gear assembly 43 is connected with the second power shaft 6; in this way, the first power shaft 5 can be driven to generate electricity through the first gear assembly 42, and the second power shaft 6 can be driven to rotate through the second gear assembly 43; by adjusting the position of the synchronizer 44 to combine or disconnect the first gear assembly 42 and the second gear assembly 43, the power transmission path can be switched, the transmission structure is simplified, and the cost and maintenance difficulty are reduced.

[0065] In an embodiment, referring to Figure 1 , the vehicle further comprises a power distribution unit 10 and an integrated power unit 11; a first end of the power distribution unit 10 is connected with the power battery 8; a second end of the power distribution unit 10 is connected with the first motor 1 of the hybrid power system through an integrated power unit 11 and connected with the second motor 2 of the hybrid power system through another integrated power unit 11; the vehicle further comprises an engine management system 12, a battery management system 13 and a vehicle control unit 14; the engine management system 12 is arranged on the engine 3; the battery management system 13 is arranged on the power battery 8; the vehicle control unit 14 is arranged between the engine management system 12 and the integrated power unit 11.

[0066] As an example, the vehicle further comprises a power distribution unit 10 and an integrated power unit 11; during installation, a first end of the power distribution unit 10 is connected with the power battery 8; a second end of the power distribution unit 10 is connected with the first motor 1 through an integrated power unit 11 and connected with the second motor 2 through another integrated power unit 11; in this way, stable and efficient operation of the hybrid power system can be ensured.

[0067] As an example, referring to Figure 1 , the vehicle further comprises an engine management system 12, a battery management system 13 and a vehicle control unit 14; during installation, the engine management system 12 is arranged on the engine 3; the battery management system 13 is arranged on the power battery 8; the vehicle control unit 14 is arranged between the engine management system 12 and the integrated power unit 11; in this way, stable and efficient operation of the hybrid power system can be further ensured.

[0068] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A hybrid system characterized by comprising: The hybrid power system comprises a first motor, a second motor, an engine and a switching mechanism; The first motor is connected to a first power shaft, and the second motor is electrically connected to the first motor; The engine is connected to a second power shaft or the second motor through the switching mechanism, and is used for switching the hybrid power system into an engine direct drive mode or an extended range mode.

2. The hybrid system according to claim 1, characterized by The switching mechanism comprises a power output shaft, a first gear assembly, a second gear assembly and a synchronizer; The power output shaft is connected to the engine; The first gear assembly and the second gear assembly are arranged on the power output shaft in a spaced manner; The first gear assembly is connected to the second motor, and the second gear assembly is used for connecting the second power shaft; The synchronizer is arranged on the power output shaft and located between the first gear assembly and the second gear assembly, and is used for being combined with or disconnected from the first gear assembly and the second gear assembly.

3. The hybrid system according to claim 2, characterized by The first gear assembly comprises a first loose gear and a first transmission gear in meshing engagement, and the second gear assembly comprises a second loose gear and a second transmission gear in meshing engagement; The first loose gear and the second loose gear are arranged on the power output shaft in a spaced manner; The first transmission gear is connected to the second motor, and the second transmission gear is used for connecting the second power shaft.

4. The hybrid system according to claim 2, characterized by The hybrid power system further comprises an engine flywheel; 5. The hybrid system of claim 1, wherein, The engine flywheel is arranged on the power output shaft and located between the engine and the second gear assembly. The hybrid power system further comprises a power battery; 6. The hybrid system of claim 2, wherein, The power battery is electrically connected to the first motor and the second motor. When the engine is stopped, the first motor is driven, the second motor is stopped, the synchronizer is not combined, and the hybrid power system is in an electric mode; When the engine is working, the first motor is driven, the second motor is generating electricity, the synchronizer is combined with the first gear assembly, and the hybrid power system is in a series mode; When the engine is working, the first motor is generating electricity / driven / following, the second motor is stopped, the synchronizer is combined with the second gear assembly, and the hybrid power system is in a parallel mode; When the engine is disconnected, the first motor is driven, the second motor is disconnected, the synchronizer is disconnected, and the hybrid power system is in an energy recovery mode; 7. The hybrid system according to claim 2, characterized by When the engine is working, the first motor is stopped, the second motor is generating electricity, the synchronizer is combined with the first gear assembly, and the hybrid power system is in a parking power generation mode. The hybrid power system further comprises a differential speed reducer; 8. A vehicle characterized by comprising: The differential speed reducer is connected to the second gear assembly and used for connecting the second power shaft. The hybrid power system comprises a first power shaft, a second power shaft and the hybrid power system according to any one of claims 1-7; 9. The vehicle of claim 8, wherein, The first motor of the hybrid power system is connected to the first power shaft, and the switching mechanism of the hybrid power system is connected to the second power shaft.

10. The vehicle of claim 8, wherein, The first power shaft and the second power shaft are arranged in parallel. The vehicle further comprises an electric power distribution unit and an integrated electric power unit; a first end of the electric power distribution unit is connected to the power battery. The second end of the power distribution unit is connected to a first motor of the hybrid power system through one of the integrated power units and to a second motor of the hybrid power system through another of the integrated power units; Further comprising an engine management system, a battery management system and a vehicle control unit; the engine management system is arranged on the engine; The battery management system is arranged on the power battery; the vehicle control unit is arranged between the engine management system and the integrated power unit.

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