Multi-shaft type hybrid power system suitable for refrigerator car

Abstract

The invention discloses a multi-shaft hybrid power system suitable for a refrigerator car, which comprises an engine, a torque damper, a driving motor, a planetary gear set, a first transmission shaft, a second transmission shaft, a power output shaft, an auxiliary transmission shaft, an auxiliary transmission system, a mode clutch and the like. According to the invention, the vehicle has six operation modes of parking / parking (refrigeration work), pure electric, engine independent driving, hybrid driving, driving charging and regenerative braking, can adapt to different operation working conditions, obviously reduces fuel consumption, reduces emission of tail gas pollutants, improves the operation reliability of the refrigerator car, greatly expands the application field, and has wide application prospects. And the energy-saving benefit is obvious. In addition, no matter the vehicle is in a running state or a parking state, the auxiliary transmission system can ensure reliable and stable operation of the vehicle-mounted refrigeration compressor, the refrigeration effect is good, and therefore the operation quality of the refrigerated vehicle is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerated trucks, and in particular to a multi-axle hybrid power system suitable for refrigerated trucks. Background Art

[0002] At present, the refrigeration units used in refrigerated trucks can be divided into two categories: independent refrigeration units and non-independent refrigeration units. Among them, the independent refrigeration unit itself has a small engine and generator device to provide power and electricity to the refrigeration system. It can work independently and is not restricted by the working state of the car engine. However, it is expensive and its maintenance is more complicated than that of non-independent refrigeration units. Non-independent refrigeration units are refrigeration units that cannot work independently. This unit itself has no power device and must rely on the car engine to drive the compressor to work. When the refrigerated truck engine stops working, the non-independent refrigeration unit loses power support and the refrigeration system stops working. However, non-independent refrigeration units are cheap, simple in structure, easy to maintain and maintain, and have the advantages of high cost performance and strong market competitiveness.

[0003] Chinese patent CN 116696580 A, entitled “Engine speed control method, control device and refrigerated truck for refrigerated truck” discloses a scheme that proposes intelligent control of engine speed based on the working status of non-independent refrigeration units, which simplifies driver operation and improves market competitiveness. Chinese patent CN 116653551A, entitled “Refrigeration speed control method, device and system for non-independent refrigeration units for refrigerated trucks” discloses a strategy that the engine controller uses automatic speed increase mode or manual speed mode to adjust the engine speed according to mode information, which can achieve rapid cooling of the cabin, save time and effort, and has the advantages of safety and high accuracy. However, in the above method, when the vehicle is stationary, in order to ensure the cooling effect inside the cabin, the engine must operate normally, resulting in a series of problems such as increased fuel consumption and a significant increase in polluting exhaust emissions. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a multi-axis hybrid power system suitable for refrigerated trucks, which has the advantages of low operating cost, low exhaust emissions, great environmental benefits, and high operational reliability. It is suitable for multiple cold chain transportation scenarios such as food transportation, pharmaceutical transportation, flower and plant transportation, cold chain logistics, and catering services.

[0005] To achieve the above-mentioned object, the present invention adopts the following technical scheme: a multi-shaft hybrid power system suitable for a refrigerated truck, comprising an engine, a torque damper, a drive motor, a planetary gear set, a first transmission shaft, a second transmission shaft, a power output shaft, an auxiliary transmission shaft, an auxiliary transmission system and a mode clutch;

[0006] The planetary gear set includes a sun gear, a planet carrier and a ring gear;

[0007] The engine is rigidly connected to the ring gear of the planetary gear set through a torque damper, and the ring gear is fixed to rotate together with the second transmission shaft;

[0008] The planet carrier is fixed to rotate together with the first transmission shaft, and the sun gear is rigidly connected to the drive motor;

[0009] The first transmission shaft is rotatably supported on the second transmission shaft and can be selectively connected to the power output shaft;

[0010] The second transmission shaft may be selectively connected to the power output shaft;

[0011] The auxiliary transmission system selectively connects the auxiliary transmission shaft to the first transmission shaft or the second transmission shaft;

[0012] The mode clutch is used to independently connect any one of the first transmission shaft and the second transmission shaft to the power output shaft.

[0013] Furthermore, the auxiliary transmission shaft is rigidly connected to the vehicle-mounted refrigeration compressor via a shaft connector.

[0014] Further, the auxiliary transmission system includes a first transmission shaft gear, an auxiliary shaft first gear, an auxiliary shaft first gear combined with a ring gear, a second transmission shaft gear, an auxiliary shaft second gear, an auxiliary shaft second gear combined with a ring gear, a spline hub and a coupling sleeve; the first transmission shaft gear is mounted on the first transmission shaft and meshes with the auxiliary shaft first gear; the second transmission shaft gear is mounted on the second transmission shaft and meshes with the auxiliary shaft second gear; the spline hub is fixed on the auxiliary transmission shaft and can be selectively engaged with the auxiliary shaft first gear combined with a ring gear or the auxiliary shaft second gear combined with a ring gear through a coupling sleeve.

[0015] Furthermore, the outer surface of the spline hub is provided with external splines;

[0016] Furthermore, the engagement sleeve has internal splines;

[0017] Furthermore, the engagement sleeve can slide axially along the spline hub;

[0018] Optionally, the tooth profile of the external spline is the same as the tooth profile of the auxiliary shaft first gear combined with the gear ring and the auxiliary shaft second gear combined with the gear ring;

[0019] A multi-axle hybrid power system suitable for a refrigerated truck can control the engine, drive motor, planetary gear set, auxiliary transmission system and mode clutch to enable the multi-axle hybrid power system to have six operating modes: parking / parking (refrigeration operation), pure electric, engine drive alone, hybrid drive, driving charging and regenerative braking. The specific process is as follows:

[0020] A. Parking / parking (cooling operation)

[0021] The ring gear (41) in the planetary gear set (4) is locked, the engine (1) is turned off, the drive motor (3) is running, the mode clutch (10) disconnects the first transmission shaft (5) and the second transmission shaft (6) from the power output shaft (7), and the coupling sleeve (98) meshes with the auxiliary shaft first gear combined with the ring gear (93); the power output by the drive motor (3) is transmitted to the first transmission shaft (5) via the sun gear (43) and the planet carrier (42), and all the power is transmitted to the auxiliary transmission shaft (8) via the first transmission shaft gear (91), the auxiliary shaft first gear (92), the auxiliary shaft first gear combined with the ring gear (93), the coupling sleeve (98), and the spline hub (97);

[0022] B. Pure electric mode

[0023] The ring gear in the planetary gear set is locked, the engine is turned off, the drive motor is running, the mode clutch connects the first transmission shaft to the power output shaft, and the coupling sleeve is meshed with the first gear of the auxiliary shaft in combination with the ring gear; the power output by the drive motor is transmitted to the first transmission shaft via the sun gear and the planet carrier, a part of the power is transmitted to the power output shaft by the mode clutch, and the other part of the power is transmitted to the auxiliary transmission shaft via the first transmission shaft gear, the first gear of the auxiliary shaft, the first gear of the auxiliary shaft in combination with the ring gear, the coupling sleeve, and the spline hub;

[0024] C. Engine-only driving mode

[0025] The sun gear in the planetary gear set is locked, the engine is running, the drive motor is turned off, the mode clutch connects the first transmission shaft to the power output shaft, and the coupling sleeve is meshed with the first gear of the auxiliary shaft combined with the gear ring; the power output by the engine is transmitted to the first transmission shaft through the torque damper, the gear ring and the planet carrier, a part of the power is transmitted to the power output shaft by the mode clutch, and the other part of the power is transmitted to the auxiliary transmission shaft through the first transmission shaft gear, the first gear of the auxiliary shaft, the first gear of the auxiliary shaft combined with the gear ring, the coupling sleeve, and the spline hub;

[0026] D. Hybrid driving mode

[0027] The planet carrier in the planetary gear mechanism is locked, the mode clutch connects the second transmission shaft to the power output shaft, and the coupling sleeve is meshed with the second gear of the auxiliary shaft in combination with the gear ring; the power output by the drive motor is transmitted to the second transmission shaft via the sun gear and the gear ring, and the power output by the engine is transmitted to the second transmission shaft via the torque damper, wherein a part of the power is transmitted to the power output shaft by the mode clutch, and the other part of the power is transmitted to the auxiliary transmission shaft via the second transmission shaft gear, the second gear of the auxiliary shaft, the second gear of the auxiliary shaft in combination with the gear ring, the coupling sleeve, and the spline hub;

[0028] E. Driving charging mode

[0029] The planet carrier in the planetary gear set is locked, the mode clutch connects the second transmission shaft to the power output shaft, and the coupling sleeve is meshed with the auxiliary shaft second gear combined with the gear ring; the power output by the engine is transmitted to the second transmission shaft through the torque damper, part of which passes through the gear ring, and the sun gear drives the drive motor to generate electricity, another part of the power is transmitted to the power output shaft by the mode clutch, and another part of the power is transmitted to the auxiliary transmission shaft through the second transmission shaft gear, the auxiliary shaft second gear, the auxiliary shaft second gear combined with the gear ring, the coupling sleeve, and the spline hub;

[0030] F. Regenerative braking mode

[0031] The ring gear in the planetary gear set is locked, the engine is turned off, the mode clutch connects the first transmission shaft with the power output shaft, and the coupling sleeve is meshed with the first gear of the auxiliary shaft and the ring gear; the vehicle kinetic energy is transmitted to the first transmission shaft through the power output shaft and the mode clutch, and a part of the kinetic energy is transmitted to the drive motor by the planet carrier and the sun gear, and drives the drive motor to generate electricity; the other part of the kinetic energy is transmitted to the auxiliary transmission shaft through the first transmission shaft gear, the first gear of the auxiliary shaft, the first gear of the auxiliary shaft combined with the ring gear, the coupling sleeve, and the spline hub;

[0032] The beneficial effects of the present invention are:

[0033] (1) The present invention discloses a multi-axis hybrid power system suitable for refrigerated trucks. The multi-axis architecture of the engine and the drive motor dual power source enables the vehicle to have multiple operating modes, adapt to different operating conditions, and effectively reduce the fuel consumption and exhaust pollutant emissions of the vehicle; (2) The power output by the engine and / or the drive motor can directly drive the air compressor of the refrigeration unit through the multi-axis architecture. Whether the vehicle is in the driving process or the parking state, the air compressor can be ensured to work normally in the most economical mode; in addition, the multi-power source method also significantly improves the reliability of the refrigeration operation of the entire refrigeration unit; (3) The planetary gear set is cleverly introduced into the transmission system to improve the vehicle transmission efficiency. Even when the on-board non-independent refrigeration unit is running at full load, the vehicle power performance will not be reduced, thereby improving the competitiveness of the vehicle model in the special refrigerated truck market. Compared with the prior art, the present invention has the advantages of low operating cost, strong adaptability, excellent cost performance and high reliability, and has great practical significance for promoting the high-quality development of my country's cold chain logistics and expanding the high-quality market supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0035] Figure 1 is a schematic diagram of a multi-axle hybrid power system applicable to a refrigerated vehicle disclosed in the present invention;

[0036] Figure 2 It is a schematic diagram of a multi-shaft hybrid power system applicable to a refrigerated vehicle disclosed by the present invention, in which the first transmission shaft and the second transmission shaft are disconnected from the power output shaft, and the coupling sleeve is meshed with the first gear of the auxiliary shaft and the gear ring;

[0037] Figure 3 It is a schematic diagram of a multi-shaft hybrid power system applicable to a refrigerated vehicle disclosed by the present invention, in which a first transmission shaft is connected to a power output shaft, and a coupling sleeve is meshed with a first gear of an auxiliary shaft and a gear ring;

[0038] Figure 4 It is a schematic diagram of a multi-shaft hybrid power system applicable to a refrigerated vehicle disclosed by the present invention, in which a second transmission shaft is connected to a power output shaft, and a coupling sleeve is meshed with a second gear of an auxiliary shaft and a gear ring;

[0039] Figure 1In: engine-1, torque damper-2, drive motor-3, planetary gear set-4, ring gear-41, planetary carrier-42, sun gear-43, first transmission shaft-5, second transmission shaft-6, power output shaft-7, auxiliary transmission shaft-8, auxiliary transmission system-9, mode clutch-10, first transmission shaft gear-91, auxiliary shaft first gear-92, auxiliary shaft first gear combined with ring gear-93, second transmission shaft gear-94, auxiliary shaft second gear-95, auxiliary shaft second gear combined with ring gear-96, spline hub-97, coupling sleeve-98. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] Embodiments of the present invention are described in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] Figure 1 This is a schematic diagram of a multi-axle hybrid power system suitable for a refrigerated vehicle disclosed in the present invention, which only schematically shows the components related to the present invention. Figure 1 A multi-axis hybrid power system suitable for a refrigerated truck shown in the figure includes an engine 1, a torque damper 2, a drive motor 3, a planetary gear set 4, a first transmission shaft 5, a second transmission shaft 6, a power output shaft 7, an auxiliary transmission shaft 8, an auxiliary transmission system 9 and a mode clutch 10; the planetary gear set 4 includes a sun gear 43, a planetary carrier 42 and a ring gear 41; wherein the engine 1 is rigidly connected to the ring gear 41 of the planetary gear set through the torque damper 2, and the ring gear 41 is fixed to rotate together with the second transmission shaft 6; the planetary carrier 42 is fixed to rotate together with the first transmission shaft 5, and the sun gear 43 is rigidly connected to the drive motor 3; the first transmission shaft 5 is rotatably supported on the second transmission shaft 6 and can be selectively connected to the power output shaft 7; the second transmission shaft 6 can be selectively connected to the power output shaft 7; the auxiliary transmission system 9 selectively connects the auxiliary transmission shaft 8 to the first transmission shaft 5 or the second transmission shaft 6; the mode clutch 10 is used to independently connect either the first transmission shaft 5 or the second transmission shaft 6 to the power output shaft 7. The preferred solution is that the auxiliary transmission shaft 8 is rigidly connected to the vehicle-mounted refrigeration compressor through a shaft connector. The vehicle-mounted refrigeration compressor here is a non-independent refrigeration unit, and the auxiliary transmission shaft 8 can drive the rotor of the compressor to rotate, thereby achieving a refrigeration effect.

[0043] The auxiliary transmission system 9 includes a first transmission shaft gear 91, an auxiliary shaft first gear 92, an auxiliary shaft first gear combined with a gear ring 93, a second transmission shaft gear 94, an auxiliary shaft second gear 95, an auxiliary shaft second gear combined with a gear ring 96, a spline hub 97 and a coupling sleeve 98. Among them, the first transmission shaft gear 91 is mounted on the first transmission shaft 5 and meshes with the auxiliary shaft first gear 92; the second transmission shaft gear 94 is mounted on the second transmission shaft 6 and meshes with the auxiliary shaft second gear 95; the spline hub 97 is fixed on the auxiliary transmission shaft 8, and can be selectively engaged with the auxiliary shaft first gear combined with a gear ring 93 or the auxiliary shaft second gear combined with a gear ring 96 through the coupling sleeve 98. The preferred solution is that the auxiliary shaft first gear combined with a gear ring 93 and the auxiliary shaft second gear combined with a gear ring 96 are both equipped with a synchronization device, which can avoid the impact caused by the coupling sleeve 98 and the combined gear ring, thereby improving the reliability and service life of the system operation. Here, the outer surface of the spline hub 97 is formed with an external spline; and the tooth shape of the external spline is the same as the tooth shape of the auxiliary shaft first gear combined gear ring 93 and the auxiliary shaft second gear combined gear ring 96; the coupling sleeve 98 has an internal spline and can slide axially along the spline hub 97. The function of the auxiliary transmission system is to transmit the power output by the engine and / or the drive motor to the auxiliary transmission shaft, thereby driving the compressor rotor to rotate, effectively improving the reliability of the compressor operation. If the compressor does not need to work, the coupling sleeve 98 is in a non-engaged state, that is, it is not meshed with any of the auxiliary shaft first gear combined gear ring 93 and the auxiliary shaft second gear combined gear ring 96.

[0044] The multi-axis hybrid power system for refrigerated trucks can control the engine 1, the drive motor 3, the planetary gear set 4, the auxiliary transmission system 9 and the mode clutch 10, so that the multi-axis hybrid power system has six operating modes: parking / parking (refrigeration work), pure electric, engine drive alone, hybrid drive, driving charging and regenerative braking. It should be noted that the mode clutch 10 has three states: one-axis engagement, two-axis engagement and separation. Taking the compressor in working state as an example, the above-mentioned various operating modes are described as follows:

[0045] (1) Parking / parking (cooling operation)

[0046] See also Figure 2 , the ring gear 41 in the planetary gear set 4 is in a locked state, the engine 1 is turned off, the drive motor 3 is running, and the mode clutch 10 is in a disengaged state, so that the first transmission shaft 5 and the second transmission shaft 6 are disconnected from the power output shaft 7, and the coupling sleeve 98 is engaged with the auxiliary shaft first gear combined with the ring gear 93; the power output by the drive motor 3 is transmitted to the first transmission shaft 5 through the sun gear 43 and the planetary carrier 42, and all the power is transmitted to the auxiliary transmission shaft 8 through the first transmission shaft gear 91, the auxiliary shaft first gear 92, the auxiliary shaft first gear combined with the ring gear 93, the coupling sleeve 98, and the spline hub 97, and finally drives the compressor rotor to rotate to achieve refrigeration.

[0047] (2) Pure electric mode

[0048] See also Figure 3 , the ring gear 41 in the planetary gear set 4 is in a locked state, the engine 1 is turned off, the drive motor 3 is running, the mode clutch 10 is in a one-axis coupling state, connecting the first transmission shaft 5 with the power output shaft 7, and the coupling sleeve 98 is meshed with the auxiliary shaft first gear combined with the ring gear 93; at this time, the power output by the drive motor 3 is transmitted to the first transmission shaft 5 through the sun gear 43 and the planetary carrier 42, and part of the power is transmitted to the power output shaft 7 by the mode clutch 10, and finally drives the wheels to rotate, realizing pure electric driving of the vehicle. The other part of the power is transmitted to the auxiliary transmission shaft 8 through the first transmission shaft gear 91, the auxiliary shaft first gear 92, the auxiliary shaft first gear combined with the ring gear 93, the coupling sleeve 98, and the spline hub 97, and finally drives the compressor rotor to rotate to realize refrigeration. Considering that the current drive motor is a high-speed motor, the transmission ratio of the planetary gear set in this mode is preferably 5.

[0049] (3) Engine-only drive mode

[0050] See also Figure 3 , the sun gear 43 in the planetary gear set 4 is in a locked state, the engine 1 is running, the drive motor 3 is turned off, the mode clutch 10 is in a one-axis coupling state, connecting the first transmission shaft 5 with the power output shaft 7, and the coupling sleeve 98 is meshed with the auxiliary shaft first gear combined with the gear ring 93; the power output by the engine 1 is transmitted to the first transmission shaft 5 through the torque damper 2, the gear ring 41 and the planet carrier 42, and the second transmission shaft 6 is idling at this time. Part of the power is transmitted to the power output shaft 7 by the mode clutch 10, and finally drives the wheels to rotate, so that the vehicle engine can be driven alone; the other part of the power is transmitted to the auxiliary transmission shaft 8 through the first transmission shaft gear 91, the auxiliary shaft first gear 92, the auxiliary shaft first gear combined with the gear ring 93, the coupling sleeve 98, and the spline hub 97, and finally drives the compressor rotor to rotate to achieve refrigeration. Here, the transmission ratio of the planetary gear set in this mode is preferably 1.67.

[0051] (4) Hybrid drive mode

[0052] See also Figure 4, the planet carrier in the planetary gear mechanism 4 is in the locked state 42, the mode clutch 10 is in the two-shaft combination state, the second transmission shaft 6 is connected to the power output shaft 7, and the coupling sleeve 98 is meshed with the auxiliary shaft second gear combined with the gear ring 96; the power output by the drive motor 3 is transmitted to the second transmission shaft 6 through the sun gear 43 and the gear ring 41, and the power output by the engine 1 is transmitted to the second transmission shaft 6 through the torque damper 2. Part of the power is transmitted to the power output shaft 7 by the mode clutch 10, and then transmitted to the wheels, so as to realize the hybrid drive operation of the vehicle; the other part of the power is transmitted to the auxiliary transmission shaft 8 through the second transmission shaft gear 94, the auxiliary shaft second gear 95, the auxiliary shaft second gear combined with the gear ring 96, the coupling sleeve 98, and the spline hub 97; finally, the compressor rotor is driven to rotate to realize refrigeration.

[0053] (5) Driving charging mode

[0054] The driving charging mode is to avoid permanent damage to the power battery pack due to power loss. The kinetic energy of the engine is converted into electrical energy by the drive motor to charge the power battery pack. Figure 4 , the planet carrier in the planetary gear set 4 is locked at 42, the mode clutch 10 is in the two-shaft combination state, the second transmission shaft 6 is connected to the power output shaft 7, and the coupling sleeve 98 is meshed with the auxiliary shaft second gear combined with the ring gear 96. At this time, after the power output by the engine 1 is transmitted to the second transmission shaft 6 through the torque damper 2, part of the power passes through the ring gear 41, and the sun gear 43 drives the drive motor 3 to rotate for power generation, and the other part of the power is transmitted to the power output shaft 7 by the mode clutch 10, thereby driving the wheels to rotate and realize vehicle driving. In addition, another part of the power is transmitted to the auxiliary transmission shaft 8 through the second transmission shaft gear 94, the auxiliary shaft second gear 95, the auxiliary shaft second gear combined with the ring gear 96, the coupling sleeve 98, and the spline hub 97, and finally drives the compressor rotor to rotate to achieve refrigeration.

[0055] (6) Regenerative braking mode

[0056] See also Figure 3 , the ring gear 41 in the planetary gear set 4 is in a locked state, the engine 1 is turned off, the mode clutch 10 is in a one-shaft combined state, the first transmission shaft 5 is connected to the power output shaft 7, and the coupling sleeve 98 is engaged with the auxiliary shaft first gear combined with the ring gear 93; the vehicle kinetic energy is transmitted to the first transmission shaft 5 after passing through the power output shaft 7 and the mode clutch 10, and part of the kinetic energy is transmitted to the drive motor 3 by the planetary carrier 42 and the sun gear 43, and drives the drive motor 3 to rotate to generate electricity, thereby charging the power battery pack; the other part of the kinetic energy is transmitted to the auxiliary transmission shaft 8 through the first transmission shaft gear 91, the auxiliary shaft first gear 92, the auxiliary shaft first gear combined with the ring gear 93, the coupling sleeve 98, and the spline hub 97, and finally drives the compressor rotor to rotate to achieve refrigeration.

[0057] A multi-axis hybrid power system suitable for refrigerated trucks provided by the present invention has a multi-axis architecture with dual power sources of engine and drive motor, which can realize six operating modes, adapt to different operating conditions, and significantly reduce fuel consumption, reduce the emission of exhaust pollutants, and improve the reliability of refrigerated truck operation, greatly expanding the application field, and is particularly suitable for long-distance cold chain transportation with high refrigeration requirements, and is of great significance to promoting the high-quality development of my country's cold chain logistics.

[0058] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A multi-axle hybrid power system suitable for a refrigerated truck, characterized in that: It comprises an engine (1), a torque damper (2), a drive motor (3), a planetary gear set (4), a first transmission shaft (5), a second transmission shaft (6), a power output shaft (7), an auxiliary transmission shaft (8), an auxiliary transmission system (9) and a mode clutch (10); The planetary gear set (4) comprises a sun gear (43), a planet carrier (42) and a ring gear (41); The engine (1) is rigidly connected to the ring gear (41) of the planetary gear set via a torque damper (2), and the ring gear (41) is fixed to rotate together with the second transmission shaft (6); The planet carrier (42) is fixed to rotate together with the first transmission shaft (5), and the sun gear (43) is rigidly connected to the drive motor (3); The first transmission shaft (5) is rotatably supported on the second transmission shaft (6) and can be selectively connected to the power output shaft (7); The second transmission shaft (6) may be selectively connected to the power output shaft (7); The auxiliary transmission system (9) selectively connects the auxiliary transmission shaft (8) to the first transmission shaft (5) or the second transmission shaft (6); The mode clutch (10) is used to independently connect any one of the first transmission shaft (5) and the second transmission shaft (6) to the power output shaft (7).

2. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 1, characterized in that: The auxiliary transmission shaft (8) is rigidly connected to the vehicle-mounted refrigeration compressor via a shaft connector.

3. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 1, characterized in that: The auxiliary transmission system (9) comprises a first transmission shaft gear (91), an auxiliary shaft first gear (92), an auxiliary shaft first gear combined with a gear ring (93), a second transmission shaft gear (94), an auxiliary shaft second gear (95), an auxiliary shaft second gear combined with a gear ring (96), a spline hub (97) and an engagement sleeve (98); The first transmission shaft gear (91) is mounted on the first transmission shaft (5) and meshes with the auxiliary shaft first gear (92); The second transmission shaft gear (94) is mounted on the second transmission shaft (6) and meshes with the auxiliary shaft second gear (95); The spline hub (97) is fixed on the auxiliary transmission shaft (8) and can be selectively engaged with the auxiliary shaft first gear combined with the gear ring (93) or the auxiliary shaft second gear combined with the gear ring (96) through a coupling sleeve (98).

4. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 3, characterized in that: The outer surface of the spline hub (97) is provided with external splines.

5. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 3, characterized in that: The coupling sleeve (98) has internal splines.

6. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 3, characterized in that: The engagement sleeve (98) can slide axially along the spline hub (97).

7. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 4, characterized in that: The tooth profile of the external spline is the same as the tooth profile of the auxiliary shaft first gear combined with the gear ring (93) and the auxiliary shaft second gear combined with the gear ring (96).

8. A multi-axle hybrid power system suitable for a refrigerated vehicle as claimed in claim 1, characterized in that: By controlling the engine (1), the drive motor (3), the planetary gear set (4), the auxiliary transmission system (9) and the mode clutch (10), the multi-axle hybrid power system can have six operating modes: parking / parking (refrigeration operation), pure electric, engine-only drive, hybrid drive, driving charging and regenerative braking: A. Parking / parking (cooling operation) The ring gear (41) in the planetary gear set (4) is locked, the engine (1) is turned off, the drive motor (3) is running, the mode clutch (10) disconnects the first transmission shaft (5) and the second transmission shaft (6) from the power output shaft (7), and the coupling sleeve (98) meshes with the auxiliary shaft first gear combined with the ring gear (93); the power output by the drive motor (3) is transmitted to the first transmission shaft (5) via the sun gear (43) and the planet carrier (42), and all the power is transmitted to the auxiliary transmission shaft (8) via the first transmission shaft gear (91), the auxiliary shaft first gear (92), the auxiliary shaft first gear combined with the ring gear (93), the coupling sleeve (98), and the spline hub (97); B. Pure electric mode The ring gear (41) in the planetary gear set (4) is locked, the engine (1) is turned off, the drive motor (3) is running, the mode clutch (10) connects the first transmission shaft (5) with the power output shaft (7), and the coupling sleeve (98) is meshed with the auxiliary shaft first gear combined with the ring gear (93); the power output by the drive motor (3) is transmitted to the first transmission shaft (5) via the sun gear (43) and the planet carrier (42), a part of the power is transmitted to the power output shaft (7) by the mode clutch (10), and the other part of the power is transmitted to the auxiliary transmission shaft (8) via the first transmission shaft gear (91), the auxiliary shaft first gear (92), the auxiliary shaft first gear combined with the ring gear (93), the coupling sleeve (98), and the spline hub (97); C. Engine-only driving mode The sun gear (43) in the planetary gear set (4) is locked, the engine (1) is running, the drive motor (3) is turned off, the mode clutch (10) connects the first transmission shaft (5) with the power output shaft (7), and the coupling sleeve (98) is meshed with the auxiliary shaft first gear combined with the ring gear (93); the power output by the engine (1) is transmitted to the first transmission shaft (5) through the torque damper (2), the ring gear (41) and the planet carrier (42), a part of the power is transmitted to the power output shaft (7) by the mode clutch (10), and the other part of the power is transmitted to the auxiliary transmission shaft (8) through the first transmission shaft gear (91), the auxiliary shaft first gear (92), the auxiliary shaft first gear combined with the ring gear (93), the coupling sleeve (98) and the spline hub (97); D. Hybrid driving mode The planet carrier (42) in the planetary gear mechanism (4) is locked, the mode clutch (10) connects the second transmission shaft (6) with the power output shaft (7), and the coupling sleeve (98) meshes with the auxiliary shaft second gear combined with the ring gear (96); the power output by the drive motor (3) is transmitted to the second transmission shaft (6) via the sun gear (43) and the ring gear (41), and the power output by the engine (1) is transmitted to the second transmission shaft (6) via the torque damper (2), wherein a part of the power is transmitted to the power output shaft (7) by the mode clutch (10), and the other part of the power is transmitted to the auxiliary transmission shaft (8) via the second transmission shaft gear (94), the auxiliary shaft second gear (95), the auxiliary shaft second gear combined with the ring gear (96), the coupling sleeve (98), and the spline hub (97); E. Driving charging mode The planet carrier (42) in the planetary gear set (4) is locked, the mode clutch (10) connects the second transmission shaft (6) with the power output shaft (7), and the coupling sleeve (98) meshes with the auxiliary shaft second gear combined with the ring gear (96); the power output by the engine (1) is transmitted to the second transmission shaft (6) through the torque damper (2), a part of the power is transmitted through the ring gear (41), and the sun gear (43) drives the drive motor (3) to generate electricity, another part of the power is transmitted to the power output shaft (7) by the mode clutch (10), and another part of the power is transmitted to the auxiliary transmission shaft (8) through the second transmission shaft gear (94), the auxiliary shaft second gear (95), the auxiliary shaft second gear combined with the ring gear (96), the coupling sleeve (98), and the spline hub (97); F. Regenerative braking mode The ring gear (41) of the planetary gear set (4) is locked, the engine (1) is turned off, the mode clutch (10) connects the first transmission shaft (5) with the power output shaft (7), and the coupling sleeve (98) meshes with the auxiliary shaft first gear combined with the ring gear (93); the vehicle kinetic energy is transmitted to the first transmission shaft (5) through the power output shaft (7) and the mode clutch (10), a part of the kinetic energy is transmitted to the drive motor (3) by the planet carrier (42) and the sun gear (43), and drives the drive motor (3) to generate electricity; the other part of the kinetic energy is transmitted to the auxiliary transmission shaft (8) through the first transmission shaft gear (91), the auxiliary shaft first gear (92), the auxiliary shaft first gear combined with the ring gear (93), the coupling sleeve (98), and the spline hub (97).

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