CN217374134U

CN217374134U - Hybrid power system and working machine

Info

Publication number: CN217374134U
Application number: CN202221084744.2U
Authority: CN
Inventors: 关世海; 和进军; 张金虎
Original assignee: Sany Automobile Hoisting Machinery Co Ltd
Current assignee: Sany Automobile Hoisting Machinery Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-09-06
Anticipated expiration: 2032-04-28

Abstract

The utility model relates to a power equipment technical field provides a hybrid power system and operation machinery, and hybrid power system includes: the transmission comprises a transmission case, an engine, a motor and a main transmission shaft, wherein a first transmission and a second transmission are arranged in the transmission case; the output shaft of the engine is connected with the first clutch and the second clutch respectively; the motor is in transmission connection with the input end of the first transmission; the main transmission shaft is in transmission connection with the output end of the first transmission and the output end of the second transmission respectively. The utility model provides a hybrid power system and operation machinery can utilize the work of motor auxiliary engine, reduces the oil consumption of traveling, lets the engine be in high-efficient fuel economy district as far as possible, can switch power mode according to the requirement of road conditions, reaches the purpose of economizing on fuel.

Description

Hybrid power system and working machine

Technical Field

The utility model relates to a power equipment technical field especially relates to a hybrid power system and operation machinery.

Background

At present, the traditional operating machinery such as a wheel crane and the like adopts an engine as a power source, the application of the engine is very mature, but the engine has the disadvantages of serious pollution and substandard emission, the quality of the whole vehicle is large, and in order to meet the requirement of the dynamic property of the whole vehicle, a high-power and large-emission fuel engine is often assembled, so that the environmental pollution is serious, the economy is low and the noise is high. The low-carbon emission, low oil consumption and low noise are the main development directions of the crane industry in the future.

The engine with large displacement adopted by the traditional operating machinery such as a wheel crane and the like is divided into two branches of a main transmission and a power takeoff through a gearbox, and one branch is transmitted to an axle and is used as a power source for vehicle running; one path of the hydraulic mechanism is used for loading operation through an oil pump motor hydraulic mechanism. This form of power has the following disadvantages:

when the vehicle is started, the engine has lower efficiency and higher oil consumption; the inertia cannot be effectively utilized for energy recovery on a downhill; as is known, the waiting time is long when the vehicle gets on the train, and the engine is in a low-speed area during the waiting time, so that the efficiency of the engine is low, the oil consumption is high, and the economy is not high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hybrid power system and operation machinery for the efficiency of the driving system engine of operation machinery among the solution prior art is lower, and the oil consumption is great, problem that economic nature is not high.

The utility model provides a hybrid power system, include:

the transmission comprises a transmission case, a first transmission and a second transmission are arranged in the transmission case, a first clutch is arranged at the input end of the first transmission, and a second clutch is arranged at the input end of the second transmission;

an output shaft of the engine is connected with the first clutch and the second clutch respectively;

the motor is in transmission connection with the input end of the first transmission;

and the main transmission shaft is in transmission connection with the output end of the first transmission and the output end of the second transmission respectively.

According to the utility model provides a pair of hybrid power system still includes power take-off shaft, oil pump and hydraulic actuator, the one end of power take-off shaft with first derailleur with at least one transmission is connected in the second derailleur, the output of power take-off shaft is connected the oil pump, the exit linkage of oil pump hydraulic actuator.

According to the utility model provides a pair of hybrid power system, the motor is fixed to be set up in the gearbox.

According to the utility model provides a pair of hybrid power system still includes:

the power supply module is electrically connected with the motor;

the power supply module comprises a battery energy storage device and an all-in-one controller, and the all-in-one controller is electrically connected with the battery energy storage device and the motor respectively.

According to the utility model provides a pair of hybrid power system, power module still includes AC mouth and the on-vehicle machine that charges, AC charge mouthful with the entry electricity of the on-vehicle machine that charges is connected, the export of the on-vehicle machine that charges with battery energy memory electricity is connected.

According to the utility model provides a pair of hybrid power system still includes hybrid assembly controller and selects shift controller, hybrid assembly controller with select shift controller respectively with the battery energy memory electricity is connected, hybrid assembly controller respectively with the controller that unifies more select shift controller signal connection.

According to the utility model provides a pair of hybrid power system still includes engine cooling system and battery heat transfer system, engine cooling system connects battery heat transfer system through first control valve.

According to the utility model provides a pair of hybrid power system still includes motor cooling system, motor cooling system passes through the second control valve and connects battery heat transfer system.

According to the utility model provides a pair of hybrid power system still includes heat accumulator, first heat exchanger and second heat exchanger, engine cooling system passes through first heat exchanger with the heat accumulator heat transfer is connected, engine cooling system with be provided with the third control valve on the connecting pipeline of first heat exchanger, battery heat transfer system passes through the second heat exchanger with the heat accumulator heat transfer is connected, engine cooling system with be provided with the fourth control valve on the connecting pipeline of first heat exchanger.

The utility model also provides an operation machine, include as above the hybrid power system.

The utility model provides a hybrid power system and operation machinery makes motor and engine connection gearbox respectively, can utilize the work of motor auxiliary engine, reduces the oil consumption of traveling, lets the engine be in high-efficient fuel economy district as far as possible. The utility model provides a hybrid power system and operation machinery can choose 4 kinds of modes of traveling of motor drive, motor and the parallelly connected drive of engine, engine drive and motor electricity generation for use, switches the power mode according to the requirement of road conditions, reaches the purpose of economizing on fuel.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a usage state diagram of a hybrid power system provided by the present invention;

fig. 2 is one of the overall structural schematic diagrams of a hybrid power system provided by the present invention;

fig. 3 is a second schematic diagram illustrating an overall structure of a hybrid power system according to the present invention;

fig. 4 is a third schematic view of the overall structure of a hybrid power system provided by the present invention;

fig. 5 is a fourth schematic diagram illustrating an overall structure of a hybrid power system according to the present invention;

fig. 6 is a fifth schematic view of the overall structure of a hybrid power system provided by the present invention;

fig. 7 is a sixth schematic diagram of the overall structure of a hybrid power system provided by the present invention;

fig. 8 is a seventh schematic diagram illustrating an overall structure of a hybrid power system according to the present invention;

fig. 9 is an eighth schematic diagram of the overall structure of a hybrid power system provided by the present invention;

fig. 10 is one of the heat exchange cycle structure diagrams of a hybrid power system provided by the present invention;

fig. 11 is a second diagram of a heat exchange cycle of a hybrid power system according to the present invention;

fig. 12 is a third diagram of a heat exchange cycle of a hybrid power system according to the present invention;

reference numerals:

1. an engine; 2. a gearbox; 3. a main drive shaft; 4. a power take-off shaft; 5. an oil pump; 6. a gear selecting and shifting controller; 7. an all-in-one controller; 8. a hybrid powertrain controller; 9. a battery energy storage device; 10. a vehicle-mounted charger; 11. an AC charging port; 12. a first transmission; 13. a first clutch; 14. a second transmission; 15. a second clutch; 16. a hydraulic actuator; 17. an axle; 18. an engine cooling system; 19. a first circulation pump; 20. a first heat sink; 21. a battery heat exchange system; 22. a second circulation pump; 23. an expansion tank; 24. a second heat sink; 25. a first control valve; 26. a motor heat dissipation system; 27. a third circulation pump; 28. a third heat sink; 29. a heat accumulator; 30. a first heat exchanger; 31. a second heat exchanger; 32. a third control valve; 33. a fourth control valve; 34. a motor; 35. a second control valve.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

A hybrid powertrain according to an embodiment of the present invention is described below with reference to fig. 1 to 12, and includes a transmission 2, an engine 1, a motor 34, a power supply module, and a main drive shaft 3. A first transmission 12 and a second transmission 14 are arranged in the gearbox 2, a first clutch 13 is arranged at the input end of the first transmission 12, and a second clutch 15 is arranged at the input end of the second transmission 14; the output shaft of the engine 1 is connected with a first clutch 13 and a second clutch 15 respectively; the motor 34 is in transmission connection with the input end of the first transmission 12; the main transmission shaft 3 is respectively connected with the output end of the first transmission 12 and the output end of the second transmission 14 in a transmission way, and the main transmission shaft 3 is suitable for being connected with an axle 17 to provide power for the running of the vehicle.

The utility model discloses hybrid power system, first clutch 13 and second clutch 15 can control being connected of engine 1 and first derailleur 12 and second derailleur 14, and the switching state and the operation of engine 1, motor 34 through controlling first clutch 13 and second clutch 15 can make the utility model discloses hybrid power system has motor 34 drive, motor 34 and the parallelly connected drive of engine 1, the drive of

engine

1 and 4 traveling modes of braking energy recovery. The 4 driving modes are specifically as follows:

the motor 34 drives the travel mode, see fig. 2: the first clutch 13 and the second clutch 15 are disconnected simultaneously, the engine 1 is turned off, the motor 34 runs by using electric energy, and the motor 34 provides power for the main transmission shaft 3 independently;

the electric machine 34 drives the running mode in parallel with the engine 1, see fig. 3 and 4: one of the first clutch 13 and the second clutch 15 is closed, the engine 1 and the motor 34 run simultaneously, and the motor 34 and the engine 1 supply power to the main transmission shaft 3 simultaneously;

engine 1 drive running mode, see fig. 5: the first clutch 13 is disconnected, the second clutch 15 is closed, the engine 1 runs, the motor 34 is closed, and the engine 1 alone provides power for the main transmission shaft 3;

the electric motor 34 generates electric power, see fig. 6: the power generation mode of the motor 34 is divided into two specific conditions, in one condition, when the vehicle runs normally, the power of the engine 1 exceeds the power requirement of normal running, and the electric quantity of the power supply module is insufficient, the first clutch 13 is closed, the second clutch 15 is disconnected, only the engine 1 runs in a working mode, the motor 34 is used as a generator, one part of the power of the engine 1 is used for providing power for the main transmission shaft 3, and the other part of the power drives the motor 34 to generate power; in another case, when the accelerator pedal is braked or released, the engine 1 stops working, the main transmission shaft 3 rotates along with the wheel back-dragging motor 34, and the motor 34 plays the role of a generator at this time, and mechanical energy is converted into electric energy for energy recovery.

Alternatively, the motor 34 is fixedly arranged in the transmission case 2, and a rotating shaft of the motor 34 is in transmission connection with the input end of the first transmission 12 through a gear in the transmission case 2.

The utility model discloses hybrid power system still includes power module, and power module is connected with 34 electricity of motor. The power supply module comprises a battery energy storage device 9 and an all-in-one controller 7, wherein the battery energy storage device 9 is any one of nickel-cadmium batteries, nickel-hydrogen batteries, lithium ion batteries, lithium polymer batteries or lead-acid batteries and the like. The all-in-one controller 7 is respectively electrically connected with the battery energy storage device 9 and the motor 34, and direct current output by the battery energy storage device 9 is transmitted to the motor 34 through a DC/DC converter, an inverter and a booster circuit in the all-in-one controller 7 to provide electric energy for the motor 34; alternating current generated when the motor 34 is used as a generator can also be rectified and decompressed by the all-in-one controller 7 and then stored in the battery energy storage device 9.

Optionally, the power supply module further includes an AC charging port 11 and an on-vehicle charger 10, the AC charging port 11 is electrically connected to an inlet of the on-vehicle charger 10, and an outlet of the on-vehicle charger 10 is electrically connected to the battery energy storage device 9. After the AC charging port 11 is externally connected with a power supply, the power supply can supply power to the battery energy storage device 9, and can also directly supply power to the motor 34.

According to the utility model discloses hybrid power system still includes hybrid assembly controller 8 (see fig. 1) and selects shift controller 6, and hybrid assembly controller 8 with select shift controller 6 and be connected with battery energy memory 9 electricity respectively, hybrid assembly controller 8 respectively with unify controller 7 more, select shift controller 6 signal connection. The hybrid powertrain controller 8 can comprehensively control the motor 34 and the gearbox 2 through the all-in-one controller 7 and the gear selecting and shifting controller 6, and intelligent control of the motor 34 and the gearbox 2 is achieved.

In some embodiments of the present invention, the hybrid system further includes a power take-off shaft 4, an oil pump 5 and a hydraulic actuator 16. One end of the power take-off shaft 4 is in transmission connection with at least one of the first transmission 12 and the second transmission 14, and can take power from the gearbox 2. The output end of the power take-off shaft 4 is connected with an oil pump 5, and the outlet of the oil pump 5 is connected with a hydraulic actuator 16. The hydraulic actuator 16 includes at least one of a hydraulic winch, a hydraulic swing motor, a luffing cylinder, and a telescoping cylinder.

In the present exemplary embodiment, the power take-off shaft 4 is preferably in driving connection with both the first transmission 12 and the second transmission 14. The engine 1 and the motor 34 can provide running power for the oil pump 5 when running, and can be divided into the following three operation modes according to the engaging states of the first clutch 13 and the second clutch 15 and the running conditions of the engine 1 and the motor 34:

parking motor 34 operating mode, see fig. 7: in this mode, the first clutch 13 and the second clutch 15 are both in an off state, when the energy value of the battery energy storage device 9 is higher than a set value and is in a parking state, if the operation of getting on the vehicle is performed at this time, the electric energy of the battery energy storage device 9 is boosted and inverted by the all-in-one controller 7 to convert the direct current into alternating current required by the motor 34, the energy is converted by the motor 34 to convert the electric energy into mechanical energy, the mechanical energy is transmitted to the power take-off shaft 4 through the first transmission 12, the power take-off shaft 4 rotates to drive the oil pump 5 to perform oil pressure conversion, and the oil pressure is output to the hydraulic actuator 16 to perform the operation (such as winding, rotation, amplitude variation, stretching and the like) of getting on the vehicle.

Engine 1 operation mode is stopped, see fig. 8: when the energy value of the battery energy storage device 9 is lower than the set value and in the parking state, the first clutch 13 is closed, the second clutch 15 is opened, only the engine 1 operates, and the motor 34 serves as a generator. Part of the mechanical energy output by the engine 1 is transmitted to the oil pump 5 through the power take-off shaft 4 to perform boarding operation, and the redundant mechanical energy is converted into electric energy through the motor 34 to charge the battery energy storage device 9. Traditional operation moment of getting on the bus needs less, and engine 1's efficiency is lower under this kind of operating mode, and fuel economy is not high, and the energy is extravagant serious, the embodiment of the utility model provides an increase engine 1 output moment, effectively utilize engine 1's output characteristic, with the effective recycle of engine 1's energy, improved engine 1's work efficiency.

Plug-in mode, see fig. 9: in this mode, the first clutch 13 and the second clutch 15 are both in a disconnected state, when the commercial power is 220V or 380V AC in the working environment, the commercial power is transmitted to the vehicle-mounted charger 10 through the AC charging port 11 to be converted into dc power, a part of the electric power input by the vehicle-mounted charger 10 is charged and stored in the battery energy storage device 9, the other part of the electric power is converted into AC power through the inversion and boosting operations of the multi-in-one controller 7, the AC power is converted into mechanical power through the motor 34, the mechanical power is transmitted to the power take-off shaft 4 through the first transmission 12, the power take-off shaft 4 rotates to drive the oil pump 5 to perform oil pressure conversion, and the converted electric power is output to the hydraulic actuator 16 to perform boarding operation (such as winding, rotation, amplitude variation, stretching and the like).

As shown in fig. 10, in some embodiments of the present invention, the hybrid power system further includes an engine heat dissipation system 18 and a battery heat exchange system 21, the engine heat dissipation system 18 is used for dissipating heat from the engine 1, so as to avoid the temperature of the engine 1 from being too high, and the battery heat exchange system 21 is used for adjusting the temperature of the battery energy storage device 9, thereby ensuring that the battery energy storage device 9 works at a suitable temperature. The engine heat dissipation system 18 is connected to the battery heat exchange system 21 through a first control valve 25, the first control valve 25 can control opening and closing of a passage between the engine heat dissipation system 18 and the battery heat exchange system 21, specifically, the first control valve 25 is a three-way valve, two control valves are arranged on the engine heat dissipation system 18, one valve port of the first control valve 25 is connected to the battery heat exchange system 21, and when the first control valve 25 is opened and connected to the valve port of the battery heat exchange system 21, coolant of the engine heat dissipation system 18 can enter the battery heat exchange system 21, so that temperature adjustment of the battery energy storage device 9 is achieved. Particularly, when the battery energy storage device 9 cannot normally operate due to low temperature at a low ambient temperature, the coolant of the engine heat dissipation system 18 may be introduced into the battery heat exchange system 21 to heat the battery energy storage device 9.

Optionally, the engine cooling system 18 includes a first circulation pump 19 and a first radiator 20, and the first circulation pump 19 and the first radiator 20 form a cooling cycle with the engine water tank. The battery heat exchange system 21 comprises a second circulating pump 22 and an expansion water tank 23, and the second circulating pump 22, the expansion water tank 23 and the battery energy storage device 9 form the battery heat exchange system 21. To avoid that the temperature of the coolant in the engine coolant system 18 is too high to cause damage to the battery heat exchanging system 21, the first control valve 25 and the second control valve 35 are preferably arranged at positions downstream of the first radiator 20 in the engine coolant system 18.

Optionally, the battery heat exchanging system 21 further includes a second heat sink 24, and when the operating temperature of the battery energy storage device 9 is higher, the battery energy storage device 9 can dissipate heat through the second heat sink 24. To ensure the operating temperature of the battery energy storage device 9 in cold environments, a three-way valve that can control whether the second radiator 24 is added to the cycle or not may be provided in the battery heat exchange system 21.

As shown in fig. 11, according to the embodiment of the present invention, the hybrid power system further includes a motor heat dissipation system 26, and the motor heat dissipation system 26 is connected to the battery heat exchange system 21 through a second control valve 35. The second control valve 35 is a three-way valve, two valves are arranged on the engine heat dissipation system 18, one valve port of the second control valve 35 is connected to the battery heat exchange system 21, and when the second control valve 35 is opened and connected to the valve port of the battery heat exchange system 21, the coolant of the motor heat dissipation system 26 can enter the battery heat exchange system 21, so that the temperature of the battery energy storage device 9 can be adjusted.

Optionally, the motor heat dissipation system 26 includes a third circulation pump 27 and a third radiator 28, and the third circulation pump 27 and the third radiator 28 form a heat dissipation cycle with a housing water jacket of the motor 34.

The coolant of the motor cooling system 26 may also be used for temperature regulation of the battery energy storage device 9. When the vehicle is stopped in a cold environment, if the engine 1 stops operating, the coolant in the engine cooling system 18 can heat the battery energy storage device 9 only in a short time after the engine 1 stops operating, and the battery energy storage device 9 can be continuously kept at a proper operating temperature by heating with the heat generated by the motor 34 during the vehicle-on operation.

As shown in fig. 12, in some embodiments of the present invention, the hybrid system further includes a regenerator 29, a first heat exchanger 30, and a second heat exchanger 31. The engine heat dissipation system 18 is in heat exchange connection with the heat accumulator 29 through the first heat exchanger 30, and the battery heat exchange system 21 is in heat exchange connection with the heat accumulator 29 through the second heat exchanger 31, so that heat in the engine heat dissipation system 18 can be exchanged into the heat accumulator 29, and heat in the heat accumulator 29 can be exchanged into the battery heat exchange system 21 to heat the battery energy storage device 9. A third control valve 32 is arranged on a connecting pipeline between the engine cooling system 18 and the first heat exchanger 30, a fourth control valve 33 is arranged on a connecting pipeline between the engine cooling system 18 and the first heat exchanger 30, and whether heat storage is performed or the battery energy storage device 9 is heated can be determined according to requirements by controlling the valve positions of the third control valve 32 and the fourth control valve 33. When the ambient temperature is low, the heat generated by the engine 1 can be stored in the heat accumulator 29 during driving, and the stored heat is used for heating the battery energy storage device 9 during parking operation, so that the utilization rate of energy can be improved, and the battery energy storage device 9 is ensured to have a good working environment.

An embodiment of the utility model provides a still provides an operation machine, including the hybrid power system of above arbitrary item. The utility model discloses operation machinery can be any kind in equipment such as wheeled crane, excavator or ascending a height car.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A hybrid powertrain system, comprising:

2. The hybrid system according to claim 1, further comprising a power take-off shaft, an oil pump and a hydraulic actuator, wherein one end of the power take-off shaft is in transmission connection with at least one of the first transmission and the second transmission, an output end of the power take-off shaft is connected with the oil pump, and an outlet of the oil pump is connected with the hydraulic actuator.

3. The hybrid powertrain system of claim 1, wherein the electric machine is fixedly disposed within the transmission.

4. The hybrid system of claim 1, further comprising:

the power supply module is electrically connected with the motor and comprises a battery energy storage device and an all-in-one controller, and the all-in-one controller is respectively electrically connected with the battery energy storage device and the motor.

5. The hybrid power system of claim 4, wherein the power supply module further comprises an AC charging port and a vehicle-mounted charger, the AC charging port is electrically connected with an inlet of the vehicle-mounted charger, and an outlet of the vehicle-mounted charger is electrically connected with the battery energy storage device.

6. The hybrid power system according to claim 4 or 5, further comprising a hybrid powertrain controller and a gear selection and shift controller, wherein the hybrid powertrain controller and the gear selection and shift controller are electrically connected to the battery energy storage device, respectively, and the hybrid powertrain controller is in signal connection with the all-in-one controller and the gear selection and shift controller, respectively.

7. The hybrid system of claim 1, further comprising an engine heat rejection system and a battery heat exchange system, the engine heat rejection system being coupled to the battery heat exchange system through the first control valve.

8. The hybrid system of claim 7, further comprising a motor heat rejection system coupled to the battery heat exchange system through a second control valve.

9. The hybrid power system according to claim 7 or 8, further comprising a heat accumulator, a first heat exchanger and a second heat exchanger, wherein the engine heat dissipation system is in heat exchange connection with the heat accumulator through the first heat exchanger, a third control valve is arranged on a connection pipeline between the engine heat dissipation system and the first heat exchanger, the battery heat exchange system is in heat exchange connection with the heat accumulator through the second heat exchanger, and a fourth control valve is arranged on a connection pipeline between the engine heat dissipation system and the first heat exchanger.

10. A work machine comprising a hybrid system according to any one of claims 1 to 9.