CN118494162B

CN118494162B - Oil-electricity hybrid driving method suitable for new energy vehicle and new energy vehicle

Info

Publication number: CN118494162B
Application number: CN202410964701.0A
Authority: CN
Inventors: 李业彬; 王明俊; 刘清正; 周旭辉; 白冰
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2024-07-18
Filing date: 2024-07-18
Publication date: 2024-09-27
Anticipated expiration: 2044-07-18
Also published as: CN118494162A

Abstract

The application relates to the technical field of new energy oil-electricity hybrid power, and discloses an oil-electricity hybrid driving method suitable for a new energy vehicle and the new energy vehicle. The hybrid driving method suitable for the new energy vehicle comprises the following steps: acquiring a driving mode instruction, wherein the driving mode instruction comprises a pure oil driving mode and a pure electric driving mode; under the condition of pure oil driving mode, the clutch is controlled to be combined and the gear shifting mechanism is controlled to be switched to the second gear, meanwhile, the engine is controlled to work, and the working device is driven by the engine to work; under the condition of a pure electric mode, the clutch is controlled to be separated, the motor is controlled to work, the gear shifting mechanism is controlled to be switched to a first gear, and the motor drives the working device to work. According to the oil-electricity hybrid driving method suitable for the new energy vehicle, in the pure oil driving mode, the rotor of the motor is limited to rotate, so that the motor cannot be driven to rotate when the engine drives the power transmission shaft to rotate, and the use safety is improved.

Description

Oil-electricity hybrid driving method suitable for new energy vehicle and new energy vehicle

Technical Field

The application belongs to the technical field of new energy oil-electricity hybrid power, and particularly relates to an oil-electricity hybrid driving method suitable for a new energy vehicle and the new energy vehicle.

Background

Along with the continuous improvement of the living standard of people, the energy conservation and environmental protection are also receiving more and more attention from people. Particularly in the technical field of transmission, an independent engine is adopted to drive an oil pump, and the problems of high oil consumption, large pollution, high use cost and the like are faced; and by adopting a single motor to drive the oil pump, high-voltage power can not be provided at any time in many places. Therefore, in order to reasonably allocate power and reduce energy consumption, the hybrid oil-electric drive can well solve the problems.

However, in the traditional new energy oil-electricity hybrid driving device, an engine is in transmission connection with a motor rotor of a motor through a clutch, and the other end of the motor rotor is directly connected with a working device. The clutch is disconnected under the pure electric mode, and the motor works; when the pure engine works, the clutch is powered on to drive the working device through the motor rotor; in the hybrid mode, the clutch is connected, and the motor and the engine drive the working device to work simultaneously. Thus, when the motor is driven in the pure engine mode, the motor rotor rotates along with the motor rotor, and particularly for a permanent magnet motor, three-phase alternating current high voltage is generated on a three-phase line of the motor, and the high voltage can generate potential safety hazards for personnel or a motor controller.

Disclosure of Invention

The application aims to provide an oil-electricity hybrid driving method suitable for a new energy vehicle and the new energy vehicle, which are used for solving the problem that in the prior art, when pure oil is driven, an engine drives a motor rotor to rotate along with the motor rotor, so that potential safety hazards exist.

In order to achieve the above object, according to one aspect of the present application, there is provided a hybrid electric drive method suitable for a new energy vehicle, in which a working device is connected to a hybrid electric drive device through a power transmission shaft, the hybrid electric drive device including an engine, a motor, and a shift mechanism, the engine and the power transmission shaft being in driving connection through a clutch, the shift mechanism including a first gear and a second gear that are switchable, the shift mechanism being configured to drivingly connect the motor to the power transmission shaft when switching to the first gear, and to disconnect the motor from the power transmission shaft and to restrict rotation of a rotor in the motor when switching to the second gear; the oil-electricity hybrid driving method suitable for the new energy vehicle comprises the following steps:

S100: acquiring a driving mode instruction, wherein the driving mode instruction comprises a pure oil driving mode and a pure electric driving mode;

S200: under the pure oil driving mode, the clutch is controlled to be combined, the gear shifting mechanism is controlled to be switched to the second gear, the engine is controlled to work, and the working device is driven by the engine to work;

S300: under the condition of the pure electric mode, the clutch is controlled to be separated, the motor is controlled to work, the gear shifting mechanism is controlled to be switched to the first gear, and the motor drives the working device to work.

In some embodiments, before controlling the shift mechanism to switch to the second gear in step S200 further includes:

s210: acquiring the current rotating speed of the motor and controlling the rotating speed of the motor to be reduced to 0;

S220: and when the rotating speed of the motor is reduced to a safe gear shifting speed range, controlling the gear shifting mechanism to be switched to the second gear.

In some embodiments, controlling the engine operation in step S200 includes:

S230: setting the engine to be in a rotating speed mode;

S240: acquiring a first target rotating speed request of the working device;

S250: and according to the request of the first target rotating speed, controlling the engine to operate at the first target rotating speed.

In some embodiments, the hybrid driving method for a new energy vehicle further includes:

And when the obtained driving mode instruction is the pure electric driving mode and the motor is connected to a high-voltage power supply, entering the pure electric driving mode.

In some embodiments, before controlling the shift mechanism to switch to the first gear in step S300 further includes:

s310: acquiring the current required rotating speed of the working device;

S320: controlling the motor to work according to the current required rotating speed of the working device so as to enable the rotating speed of the motor to be matched with the current required rotating speed of the working device;

S330: and under the condition that the rotating speed of the motor is matched with the current required rotating speed of the working device, controlling the gear shifting mechanism to be switched to the first gear.

In some embodiments, the output end of the motor is provided with a speed changer, and the speed changer is used for being in transmission connection with the power transmission shaft;

In the step S330, the current required rotation speed of the working device is defined as V2, the reduction ratio of the transmission is i, and the rotation speed of the motor is V3;

When v3=v2×i is satisfied, it is determined that the rotational speed of the motor matches the current rotational speed required by the working device.

In some embodiments, after controlling the shift mechanism to switch to the first gear in step S300 further includes:

s340: setting the motor to be in a rotating speed mode;

S350: acquiring a second target rotating speed request of the working device;

S360: and according to the request of the second target rotating speed, controlling the motor to operate at the second target rotating speed.

In some embodiments, the hybrid electric drive further comprises a power take-off drivingly connected to the motor;

the gear shifting mechanism further comprises a third gear, and the motor is used for transmitting torque to the power takeoff when the third gear is used for transmitting torque to the power takeoff;

the driving mode instruction further comprises a power taking driving mode, and the hybrid driving method applicable to the new energy vehicle further comprises the following step S400:

S400: under the condition of the power take-off driving mode, the clutch is controlled to be separated, the motor is controlled to work, meanwhile, the gear shifting mechanism is controlled to be switched to the third gear, and torque is transmitted to the power take-off device through the motor.

In some embodiments, the step S400 further includes, after controlling the clutch to be disengaged:

S410: controlling the torque of the motor to be reduced to 0;

s420: when the torque of the motor is reduced to a safe gear shifting torque range, controlling the gear shifting mechanism to switch to the third gear;

s430: setting the motor to be in a rotating speed mode;

S440: acquiring a third target rotating speed request of the power takeoff;

S450: and according to the request of the third target rotating speed, controlling the motor to operate at the third target rotating speed.

According to a second aspect of the application, a new energy vehicle is provided, which comprises a working device, wherein the working device is connected with an oil-electricity hybrid driving device, and the working device and the oil-electricity hybrid driving device are controlled by adopting the oil-electricity hybrid driving method suitable for the new energy vehicle according to the first aspect.

Compared with the prior art, the application provides the oil-electricity hybrid driving method suitable for the new energy vehicle and the new energy vehicle, wherein the oil-electricity hybrid driving method suitable for the new energy vehicle is used for switching gears through the gear shifting mechanism, and under the condition of a pure oil driving mode, the clutch is controlled to be combined and the gear shifting mechanism is controlled to be switched to a second gear, and meanwhile, the engine is controlled to work. Since the gear shifting mechanism is used to disconnect the motor from the power transmission shaft and to restrict the rotation of the rotor in the motor in the second gear, the working device is only driven by the engine. Thus, in the pure oil driving mode, the rotor of the motor is limited to rotate, so that the motor can not drive the rotor of the motor to rotate when the engine drives the power transmission shaft to rotate. Therefore, even if the motor is selected as a permanent magnet motor, three-phase alternating current high voltage cannot be generated on the three-phase line of the motor at the moment, and the use safety is improved.

Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. Other figures may be made from the structures shown in these figures without inventive effort for a person of ordinary skill in the art. In the drawings:

Fig. 1 is a flowchart of a hybrid driving method of oil and electricity suitable for a new energy vehicle according to an embodiment of the present application;

Fig. 2 is a schematic control logic diagram of a hybrid driving method of a new energy vehicle according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a driving device of an oil-electricity hybrid driving device according to an embodiment of the present application;

FIG. 4 is an enlarged partial schematic view of FIG. 3A;

FIG. 5 is a schematic diagram of the hybrid electric vehicle of FIG. 3 in a pure oil mode;

FIG. 6 is a schematic diagram illustrating the hybrid electric vehicle of FIG. 3 in a pure electric mode;

FIG. 7 is a schematic diagram illustrating the hybrid electric drive apparatus of FIG. 3 in a hybrid drive mode;

fig. 8 is a schematic diagram of the hybrid electric vehicle driving apparatus shown in fig. 3 in a power take-off driving mode.

Description of the reference numerals

100. A power transmission shaft; 110. a transfer tooth;

200. An engine;

300. A motor; 310. a rotor;

400. A transmission; 410. a housing; 420. braking teeth; 430. an output tooth; 440. a sun gear; 450. a planet carrier; 451. a drive tooth; 460. a gear ring; 470. a planet wheel;

500. A gear shifting mechanism; 510. a sliding sleeve;

600. A clutch;

700. a working device; 710. an oil pump;

800. A power take-off; 810. a power take-off gear.

Detailed Description

The following describes specific embodiments of the present application in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.

The application will be described in detail below with reference to the drawings in connection with exemplary embodiments.

Example 1

Referring to fig. 1,2 and 3, the present embodiment provides a hybrid driving method applicable to a new energy vehicle, which can be used for controlling a working device 700 in the new energy vehicle.

Alternatively, the work device 700 may be selected as a wheel in a running gear or as an oil pump 710 in a hydraulic system.

The working device 700 is connected to a hybrid electric drive device via the power transmission shaft 100. The oil-electricity hybrid driving device can realize pure oil driving or pure electric driving. In some embodiments, hybrid electric drive may also be performed under special circumstances.

Further, the hybrid electric drive apparatus includes an engine 200, an electric motor 300, and a shift mechanism 500. The engine 200 is in driving connection with the power transmission shaft 100 through the clutch 600, the gear shifting mechanism 500 comprises a first gear and a second gear which are switchable, when switching to the first gear, the gear shifting mechanism 500 is used for enabling the motor 300 to be in driving connection with the power transmission shaft 100, and when switching to the second gear, the gear shifting mechanism 500 is used for enabling the motor 300 to be disconnected from the power transmission shaft 100 and limiting the rotation of the rotor 310 in the motor 300.

The operations of the engine 200, the motor 300, and the shift mechanism 500 may be controlled by a controller, which may be a PLC controller.

Referring to fig. 1 and 2, the present embodiment provides a hybrid driving method for a new energy vehicle, which includes the following steps:

S100: and acquiring a driving mode instruction, wherein the driving mode instruction comprises a pure oil driving mode and a pure electric driving mode.

S200: in the pure oil driving mode, the control clutch 600 is engaged and controls the shift mechanism 500 to be shifted to the second gear, and simultaneously controls the engine 200 to operate, and the working device 700 is driven by the engine 200 to operate.

It will be appreciated that in the second gear, the shift mechanism 500 disconnects the electric motor 300 from the power transmission shaft 100, and thus the electric motor 300 may not be engaged. And the gear shifting mechanism 500 can also limit the rotation of the rotor 310 in the motor 300, so that the motor 200 drives the power transmission to rotate and the rotor 310 of the motor 300 is not driven to rotate, thereby effectively protecting the motor 300.

S300: in the case of the pure electric mode, the clutch 600 is controlled to be disengaged and the motor 300 is controlled to operate, and at the same time, the shift mechanism 500 is controlled to be shifted to the first gear, and the operating device 700 is driven by the motor 300 to operate.

It will be appreciated that in the first gear, the gear shifting mechanism 500 drivingly connects the motor 300 and the power transmission shaft 100, such that rotation of the rotor 310 of the motor 300 drives the power transmission shaft 100 to output torque to drive the working device 700. Since clutch 600 is in the disengaged state in the pure electric mode, only motor 300 is engaged.

In the present application, the motor 300 is powered by a high-voltage power source, and the new energy vehicle needs to drag the cable during the operation in the pure electric mode. Compared with the configuration of an energy storage battery, the weight of the whole new energy vehicle can be effectively reduced, the energy consumption is reduced, and the transportation is convenient.

In the hybrid driving method of the present embodiment, the gear is switched by the gear shifting mechanism 500, and in the case of the pure oil driving mode, the clutch 600 is controlled to be combined and the gear shifting mechanism 500 is controlled to be switched to the second gear, and meanwhile, the engine 200 is controlled to work. Since the shift mechanism 500 is used to disconnect the motor 300 from the power transmission shaft 100 and restrict the rotation of the rotor 310 in the motor 300 in the second gear, the working device 700 is driven to operate only by the engine 200. Thus, in the pure oil driving mode, since the rotor 310 of the motor 300 is restricted from rotating, the motor 200 does not rotate the rotor 310 of the motor 300 when driving the power transmission shaft 100 to rotate. Therefore, even if the motor 300 is selected as a permanent magnet motor, three-phase alternating current high voltage is not generated on the three-phase line of the motor 300 at this time, so that the use safety is improved.

In order to more clearly describe the technical scheme of the application, each step in the hybrid driving method applicable to the new energy vehicle provided by the embodiment is explained below. The method comprises the following steps:

The shift mechanism 500 is controlled in the above step S200 the shift to the second gear further includes:

s210: the current rotational speed of the motor 300 is obtained and the rotational speed of the motor 300 is controlled to be reduced to 0.

S220: when the rotational speed of the motor 300 falls to the safe shift speed range, the shift mechanism 500 is again controlled to be shifted to the second gear.

It should be noted that, because of the second gear, the rotation of the rotor 310 of the motor 300 needs to be limited, and therefore, the rotation speed of the rotor 310 of the motor 300 needs to be 0 under ideal conditions, so that the gear shifting mechanism 500 is smoothly shifted to the second gear. Further considering the actual situation, the shift mechanism 500 can also complete the gear shift when the rotational speed of the motor 300 falls within a safe shift speed range (the safe shift speed range is indicated by ±v1 in the present embodiment). The safe shift speed range may be set according to the design requirements of the hybrid electric drive apparatus, and is not particularly limited in this embodiment.

The controlling the operation of the engine 200 in the above step S200 includes:

s230: the engine 200 is set to the rotation speed mode.

S240: a first target rotational speed request of work device 700 is obtained.

S250: according to the request of the first target rotational speed, the engine 200 is controlled to operate at the first target rotational speed.

Further, the hybrid driving method suitable for the new energy vehicle further comprises the following steps: in the case where the acquired drive mode instruction is the pure electric mode, and the motor 300 is connected to the high-voltage power source, the pure electric mode is entered. It can be appreciated that, since the motor 300 is operated by connecting a high voltage cable to a high voltage power supply, it is necessary to determine whether the motor 300 is connected to the high voltage power supply before entering the pure electric mode, and if the motor 300 is not connected to the high voltage power supply, the pure electric mode cannot be entered, and the motor 300 does not operate.

The shift mechanism 500 is controlled in the above step S300 the method further includes, before switching to the first gear:

s310: the current desired rotational speed of work device 700 is obtained.

S320: the motor 300 is controlled to operate according to the current required rotation speed of the working device 700 so that the rotation speed of the motor 300 matches the current required rotation speed of the working device 700.

S330: in the event that the rotational speed of the motor 300 matches the current desired rotational speed of the work device 700, the shift mechanism 500 is again controlled to shift to the first gear.

Further, the output end of the motor 300 is provided with a transmission 400, and the transmission 400 is used for being in transmission connection with the power transmission shaft 100. In step S330, the current required rotation speed of the working device 700 is defined as V2, the reduction ratio of the transmission 400 is i, and the rotation speed of the motor 300 is V3. When v3=v2×i is satisfied, it is determined that the rotation speed of the motor 300 matches the current rotation speed required by the working device 700.

Alternatively, transmission 400 may be selected as a planetary drive reduction or a parallel shaft drive reduction.

Referring to fig. 4, in the present embodiment, the transmission 400 is selected as a planetary gear reduction structure, which includes a sun gear 440, a planet carrier 450, a ring gear 460 and planet gears 470. The sun gear 440 in the planetary transmission speed reduction structure is in transmission connection with the rotor 310 of the motor 300, the planet carrier 450 in the planetary transmission speed reduction structure is connected with the output teeth 430, and the gear shifting mechanism 500 can realize transmission connection between the transmission teeth 110 and the power transmission shaft 100.

The shift mechanism 500 is controlled in the above step S300 the shift to the first gear further includes:

S340: the motor 300 is set to a rotational speed mode.

S350: a second target rotational speed request of work device 700 is obtained.

S360: according to the request of the second target rotation speed, the motor 300 is controlled to operate at the second target rotation speed.

Referring to fig. 2,3, 4 and 7, in the present embodiment, the hybrid electric vehicle further includes a power take-off 800 in transmission connection with the motor 300. Power take-off 800 is driven directly by motor 300 to provide corresponding power to other functional components external to work device 700.

Further, the gear shifting mechanism 500 further includes a third gear, in which the electric machine 300 is used to transmit torque to the power take-off 800. The driving mode instruction further includes a power taking driving mode, and the hybrid driving method applicable to the new energy vehicle further includes step S400:

s400: in the power take-off drive mode, the clutch 600 is controlled to be disengaged and the motor 300 is controlled to operate, and the shift mechanism 500 is controlled to be shifted to the third gear, so that torque is transmitted from the motor 300 to the power take-off 800.

The clutch is controlled in the step S400 the separator 600 further includes:

S410: the torque of the control motor 300 drops to 0.

S420: when the torque of the motor 300 falls to the safe shift torque range, the shift mechanism 500 is again controlled to switch to the third gear.

It should be noted that, since the third gear may be shifted from the first gear or the second gear, if the torque of the motor 300 is too large during shifting, the shifting failure of the shifting mechanism 500 may be caused, and if the torque is too large, the equipment may be damaged. Therefore, the torque of the motor 300 is required to be 0 under ideal conditions in order for the shift mechanism 500 to smoothly shift into the third gear. Further considering the actual situation, the shift mechanism 500 can also complete the gear shift when the torque of the motor 300 falls within a safe shift torque range (indicated by ±t1 in this embodiment). The safe shift torque range may be set according to the design requirements of the hybrid electric drive apparatus, and is not particularly limited in this embodiment.

S430: the motor 300 is set to a rotational speed mode.

S440: a third target rotational speed request for power take-off 800 is obtained.

S450: according to the request of the third target rotation speed, the motor 300 is controlled to operate at the third target rotation speed.

Example two

Referring to fig. 1 to 4, the present embodiment provides a new energy vehicle. The new energy vehicle comprises a working device 700, wherein the working device 700 is connected with an oil-electricity hybrid driving device, and the working device 700 and the oil-electricity hybrid driving device are controlled by adopting the oil-electricity hybrid driving method suitable for the new energy vehicle according to the first embodiment.

Referring to fig. 3 and 4, in the present embodiment, a working device 700 is connected to an oil-electricity hybrid driving device through a power transmission shaft 100. Alternatively, the work device 700 may be selected as a wheel in a running gear or as an oil pump 710 in a hydraulic system.

The hybrid electric vehicle includes an engine 200, a motor 300, and a shift mechanism 500. The engine 200 is in driving connection with the power transmission shaft 100 through the clutch 600, the gear shifting mechanism 500 comprises a switchable first gear and a second gear, the gear shifting mechanism 500 is used for enabling the motor 300 to be in driving connection with the power transmission shaft 100 when switching to the first gear, and the gear shifting mechanism 500 is used for enabling the motor 300 to be disconnected from the power transmission shaft 100 and limiting the rotation of the rotor 310 in the motor 300 when switching to the second gear.

Specifically, a transmission 400 is connected to a rotor 310 of the motor 300, and an output end of the transmission 400 is provided with an output tooth 430 and a brake tooth 420. The output end of the transmission 400 is in driving connection with the output teeth 430, and the brake teeth 420 are fixedly arranged on the casing 410 of the transmission 400 and located at one side of the output teeth 430. The power transmission shaft 100 is provided with transmission teeth 110, and the transmission teeth 110 are positioned on the other side of the output teeth 430.

The shift mechanism 500 includes a first gear and a second gear that are switchable. It should be noted that, when the gear shifting mechanism 500 is shifted to the first gear, the output teeth 430 are in transmission connection with the transmission teeth 110 through the gear shifting mechanism 500, at least one of the engine 200 and the motor 300 can output torque to the power transmission shaft 100, so that the switching of the pure oil and the oil-electricity hybrid driving can be realized by controlling the separation and combination of the clutch 600; when the gear shifting mechanism 500 is shifted to the second gear, the output tooth 430 is in driving connection with the brake tooth 420 through the gear shifting mechanism 500, and at this time, since the brake tooth 420 is fixedly disposed on the casing 410, the brake tooth 420 is in a braking state, so that the motor 300 is not affected by the rotation of the power transmission shaft 100 in the second gear, i.e., the motor 300 is not rotated along with the rotation of the power transmission shaft 100 when the engine 200 drives the power transmission shaft 100 through the clutch 600.

Optionally, the shift mechanism 500 includes a slidable sliding sleeve 510. The shifting mode of the sliding sleeve 510 may be a friction pair clutch mode or a dog clutch mode.

In this way, in the hybrid electric driving apparatus provided in this embodiment, the engine 200 is in transmission connection with the power transmission shaft 100 through the clutch 600, the output end of the transmission 400 is in transmission connection with the output gear 430, the brake gear 420 is fixedly disposed on the casing 410 of the transmission 400, and the gear shifting mechanism 500 includes a first gear and a second gear that can be switched. The following description will be given of the pure oil driving mode, the pure electric driving mode, and the hybrid driving mode with reference to fig. 3 to 5:

Referring to fig. 5, when the pure oil driving mode is required, the gear shifting mechanism 500 is shifted to the second gear, the control clutch 600 is engaged, and the output tooth 430 is in driving connection with the brake tooth 420 through the gear shifting mechanism 500, the engine 200 can drive the power transmission shaft 100 to rotate, and the brake tooth 420 is not rotated due to the fixed connection between the brake tooth 420 and the engine 200, so that the output tooth 430 is limited to rotate under the action of the gear shifting mechanism 500, that is, the motor 300 cannot rotate along with the power transmission shaft 100.

Referring to fig. 6, when the pure electric mode is required, the gear shifting mechanism 500 is shifted to the first gear, and the output teeth 430 and the transmission teeth 110 are in driving connection through the gear shifting mechanism 500, and the clutch 600 is controlled to be disengaged, so that the motor 300 can directly drive the power transmission shaft 100 to rotate.

Referring to fig. 7, when the pure electric mode is required, the gear shifting mechanism 500 is shifted to the first gear, and the output gear 430 and the transmission gear 110 are in driving connection through the gear shifting mechanism 500, and the clutch 600 is controlled to be combined, so that the motor 300 and the engine 200 can directly drive the power transmission shaft 100 to rotate together.

In this embodiment, the transmission 400 is selected to be a planetary reduction structure including a sun gear 440, a planet carrier 450, a ring gear 460, and planet gears 470. The sun gear 440 in the planetary transmission speed reduction structure is in transmission connection with the rotor 310 of the motor 300, the planet carrier 450 in the planetary transmission speed reduction structure is connected with the output teeth 430, and the gear shifting mechanism 500 can realize transmission connection between the transmission teeth 110 and the power transmission shaft 100.

Referring to fig. 3, 4 and 8, in some embodiments, the hybrid electric driving apparatus further includes a power take-off 800, the power take-off 800 is disposed on the casing 410 of the transmission 400, and a power take-off gear 810 in the power take-off 800 is used for meshing with the driving gear 451 on the planet carrier 450. When the gear shifting mechanism 500 is shifted to the neutral gear between the first gear and the second gear, the sliding sleeve of the gear shifting mechanism 500 is only located on the output tooth 430, and the output tooth 430 is disconnected from the transmission tooth 110 and the brake tooth 420, so that the motor 300 only drives the power takeoff 800 to work, and enters the power take-off driving mode.

Referring to fig. 1 to 8, compared with the prior art, the hybrid electric driving device provided by the embodiment can realize the switching of three driving modes of pure electric driving, pure oil driving and hybrid electric driving, so that the power output can be reasonably configured according to the working conditions, and the purposes of energy conservation and emission reduction are achieved. Meanwhile, in the pure oil driving mode, the gear shifting mechanism 500 can lock the motor 300, so that the rotor 310 of the motor 300 is prevented from rotating along with the power transmission shaft 100, and even if the motor 300 is selected as a permanent magnet motor, three-phase alternating current high voltage cannot be generated on the three-phase line of the motor 300, the use safety is improved, and the equipment safety is protected.

In addition, when only pure oil driving is required, the motor 300 may be in a stationary state, thereby having positive effects of reducing overall NVH noise and reducing power consumption.

It should be noted that in some embodiments, the new energy vehicle may be selected as an engineering vehicle, where the motor 300 is powered by a high voltage cable connected to a high voltage power source, and the new energy vehicle needs to drag the cable during the operation of the pure mode, and the high voltage cable may not need to be connected when the new energy vehicle is driven by pure oil. In the specific use process, the pure oil and pure electric modes can basically meet the operation requirements. Therefore, compared with the configuration of an energy storage battery, the weight of the whole new energy vehicle can be effectively reduced, the energy consumption is reduced, and the transportation is convenient. Of course, in some embodiments, an energy storage battery may also be configured for the motor 300.

It should be noted that, in the present application, unless otherwise stated, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are used for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the application.

The planetary gear reduction structure, the engine 200, the motor 300, and other structures described in the present embodiment are well known to those skilled in the art, and are not a core improvement of the present application, and thus are not described herein.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 the present application. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A hybrid driving method of oil and electricity suitable for new energy vehicles, characterized in that a working device (700) of the new energy vehicle is connected with the hybrid driving device of oil and electricity through a power transmission shaft (100), the hybrid driving device of oil and electricity comprises an engine (200), a motor (300) and a gear shifting mechanism (500), the transmission connection between the engine (200) and the power transmission shaft (100) is realized through a clutch (600), the gear shifting mechanism (500) comprises a switchable first gear and a second gear, when the gear shifting mechanism is switched to the first gear, the gear shifting mechanism (500) is used for enabling the motor (300) to be in transmission connection with the power transmission shaft (100), and when the gear shifting mechanism is switched to the second gear, the gear shifting mechanism (500) is used for enabling the motor (300) to be disconnected with the power transmission shaft (100) and limiting rotation of a rotor (310) in the motor (300); the oil-electricity hybrid driving method suitable for the new energy vehicle comprises the following steps:

s200: in the pure oil driving mode, the clutch (600) is controlled to be combined, the gear shifting mechanism (500) is controlled to be switched to the second gear, the engine (200) is controlled to work, and the working device (700) is driven by the engine (200) to work;

S300: in the pure electric mode, the clutch (600) is controlled to be separated, the motor (300) is controlled to work, the gear shifting mechanism (500) is controlled to be switched to the first gear, and the working device (700) is driven by the motor (300) to work;

the step S300 further includes, before controlling the shift mechanism (500) to shift to the first gear:

s310: acquiring a current required rotation speed of the working device (700);

S320: controlling the motor (300) to work according to the current required rotating speed of the working device (700) so as to enable the rotating speed of the motor (300) to be matched with the current required rotating speed of the working device (700);

s330: when the rotating speed of the motor (300) is matched with the current required rotating speed of the working device (700), the gear shifting mechanism (500) is controlled to be switched to the first gear;

The output end of the motor (300) is provided with a speed changer (400), and the speed changer (400) is used for being in transmission connection with the power transmission shaft (100);

in the step S330, a current required rotation speed of the working device (700) is defined as V2, a reduction ratio of the transmission (400) is defined as i, and a rotation speed of the motor (300) is defined as V3;

when v3=v2×i is satisfied, it is determined that the rotational speed of the motor (300) matches the current rotational speed required by the working device (700).

2. The hybrid driving method according to claim 1, wherein before controlling the shift mechanism (500) to shift to the second gear in step S200 further comprises:

S210: acquiring a current rotation speed of the motor (300) and controlling the rotation speed of the motor (300) to be reduced to 0;

S220: when the rotational speed of the motor (300) falls to a safe gear shift speed range, the gear shift mechanism (500) is controlled to be shifted to the second gear.

3. The hybrid driving method according to claim 1, wherein the controlling the operation of the engine (200) in step S200 includes:

s230: setting the engine (200) to a rotational speed mode;

s240: acquiring a first target rotational speed request of the working device (700);

S250: according to the request of the first target rotating speed, the engine (200) is controlled to operate at the first target rotating speed.

4. The hybrid driving method for a new energy vehicle according to claim 1, wherein the hybrid driving method for a new energy vehicle further comprises:

And entering the pure electric mode under the condition that the obtained driving mode instruction is the pure electric mode and the motor (300) is connected with a high-voltage power supply.

5. The hybrid electric vehicle driving method according to claim 1 or 4, wherein the step S300 of controlling the shift mechanism (500) to shift to the first gear further includes:

S340: setting the motor (300) to a rotational speed mode;

s350: acquiring a second target rotational speed request of the working device (700);

S360: according to the request of the second target rotating speed, the motor (300) is controlled to operate at the second target rotating speed.

6. The hybrid electric vehicle driving method according to claim 1, wherein the hybrid electric vehicle driving apparatus further includes a power take-off (800) drivingly connected to the motor (300);

the gear shifting mechanism (500) further comprises a third gear, wherein the motor (300) is used for transmitting torque to the power takeoff (800);

s400: in the power take-off driving mode, the clutch (600) is controlled to be separated, the motor (300) is controlled to work, the gear shifting mechanism (500) is controlled to be switched to the third gear, and torque is transmitted to the power take-off device (800) through the motor (300).

7. The hybrid driving method according to claim 6, wherein the step S400 of controlling the clutch (600) to be disengaged further comprises:

s410: controlling the torque of the motor (300) to drop to 0;

S420: when the torque of the motor (300) falls to a safe gear shifting torque range, controlling the gear shifting mechanism (500) to be switched to the third gear;

S430: setting the motor (300) to a rotational speed mode;

S440: acquiring a third target rotation speed request of the power takeoff (800);

S450: according to the request of the third target rotating speed, the motor (300) is controlled to operate at the third target rotating speed.

8. A new energy vehicle, characterized by comprising a working device (700), wherein the working device (700) is connected with a hybrid oil-electric driving device, and the working device (700) and the hybrid oil-electric driving device are controlled by adopting the hybrid oil-electric driving method suitable for the new energy vehicle according to any one of claims 1-7.