CN210132999U

CN210132999U - Range extender, power output system and hybrid tractor

Info

Publication number: CN210132999U
Application number: CN201920265094.3U
Authority: CN
Inventors: 李�杰; 王锐; 雷仕泽; 史慧星; 崔洪鑫
Original assignee: FJ Dynamics Technology Co Ltd
Current assignee: FJ Dynamics Technology Co Ltd
Priority date: 2019-03-01
Filing date: 2019-03-01
Publication date: 2020-03-10
Anticipated expiration: 2029-03-01

Abstract

The utility model provides a range extender, power take off system and hybrid tractor, wherein the range extender cooperates in a power take off shaft of a hybrid tractor, wherein the range extender includes an engine and an ISG motor, wherein the ISG motor is drivably connected in the engine, wherein power take off shaft is drivably connected in the ISG motor.

Description

Range extender, power output system and hybrid tractor

Technical Field

The utility model relates to the agricultural machinery field especially involves range extender, power take off system and hybrid tractor.

Background

Tractors are one of the common agricultural machines used to tow and drive self-propelled power machines that perform various mobile tasks on a work machine. The tractor is typically provided with a PTO (power take-off) power take-off shaft that can be connected to other implements that perform traction or drive operations.

The power output shaft of the conventional internal combustion engine type tractor can be mounted to the output end of an internal combustion engine of the tractor to directly obtain power from the internal combustion engine, and smooth power is obtained by means of the characteristics of multiple gears and constant working speed of the internal combustion engine of the tractor.

With the heat of new energy application and the requirement for environmental protection, an electric tractor or a hybrid tractor is produced, and the power output shaft is generally used for an auxiliary drive motor or other stable power which is additionally arranged besides a main drive motor of the tractor, so as to be beneficial to the control of the external output power of the subsequent power output shaft.

For the whole tractor, an auxiliary motor is required to be specially added to the power output shaft in the double-motor scheme, so that the cost of the whole tractor is increased, and a corresponding power control system is more complex.

For example, a range-extended tractor is taken as an example, and the range-extended tractor is a practical transition type tractor between a traditional tractor and a pure electric tractor. The traditional tractor has higher operation oil consumption and emission requirements, and the electric tractor adopting a single energy system has the endurance which is difficult to meet the continuous operation requirements of the tractor with larger power, so the endurance of the electric tractor can be improved by adopting the internal combustion engine range extender. The range-extending hybrid towing engine has multiple working modes, and the tractor needs to control the walking state and the external output state, so that the whole control system is quite complex, and the manufacturing cost and the maintenance cost are correspondingly improved.

Further, the hybrid tractor can be formed by reforming a conventional tractor, and whether the conventional tractor can provide enough installation space or not is required.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an increase journey ware, power take off system and hybrid tractor, wherein hybrid tractor control is simple.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the driving system of the hybrid tractor has a simple structure.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the installation space required by a power output shaft of the hybrid tractor is smaller.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the driving system does not need to add an auxiliary motor or other stable power sources to connect with the power output shaft.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the power output of the hybrid tractor can reach dynamic balance with the walking output.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the hybrid tractor is capable of outputting different rotation speeds by the power output shaft.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the power of the power output shaft can be derived from an ISG (Integrated-Starter-Generator) motor and can also be derived from an engine.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the range of the power output shaft capable of bearing the load is wider.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the hybrid tractor can provide multiple energy supply modes to meet the actual demand.

Another object of the present invention is to provide a hybrid tractor and power output system and range extender and application thereof, wherein the power output shaft of the hybrid tractor can use electric energy as a power source.

Another object of the present invention is to provide a range extender, a power output system and a hybrid tractor, wherein the power of the power output shaft can be derived from the ISG motor and the engine simultaneously.

Another object of the utility model is to provide an increase journey ware, power take off system and hybrid tractor, wherein the engine can satisfy simultaneously power take off shaft with the power demand of ISG motor.

According to an aspect of the utility model provides an increase journey ware cooperates in a hybrid tractor's a power output shaft, and it includes:

an engine;

an ISG motor, wherein said ISG motor is drivably connected to said engine; and

a flexible coupling, wherein said flexible coupling is connected between said engine and an ISG motor, wherein said power take-off shaft is drivably connected to said ISG motor.

According to the utility model discloses an embodiment, increase journey ware further includes a gearbox, wherein the both ends of gearbox connect respectively in the ISG motor with power output shaft.

According to an embodiment of the present invention, the range extender has a first operation mode and a second operation mode, the first operation mode, the engine to the ISG motor with power output shaft, the ISG motor is in the power generation mode, the second operation mode, the engine with the ISG motor to power output shaft, the ISG motor is in the electric mode, wherein the range extender is operable to switch between the first operation mode and the second operation mode.

According to an embodiment of the present invention, the range extender has a third operation mode in which the internal combustion engine is in a non-operation state, the ISG motor outputs to the power output shaft, the ISG motor is in an electric mode, wherein the range extender is operable to switch between the first operation mode, the second operation mode and the third operation mode.

According to an embodiment of the present invention, the range extender has a fourth operating mode the fourth operating mode, the power output shaft is in the non-operating state, the engine to the ISG generator output, the ISG motor is in the power generation mode, wherein the range extender is operable to be switched between the first operating mode, the second operating mode, the third operating mode and the fourth operating mode.

According to an embodiment of the present invention, the range extender further comprises a range extender controller, wherein the engine and the ISG motor are respectively controllably connected to the range extender controller.

According to an aspect of the present invention, the utility model provides a power output system, it includes:

a power take-off shaft; and

the range extender above, wherein the power output shaft is connected to the range extender.

According to an embodiment of the present invention, the power output system further includes a main driving motor and a power supply system, wherein the main driving motor is connected to the power supply system in a power-suppliable manner, wherein the ISG motor is connected to the engine in a power-suppliable manner, the power supply system and the ISG motor are connected to each other in a power-suppliable manner.

According to another aspect of the utility model, the utility model provides a hybrid tractor, it includes:

a vehicle body;

a travel system, wherein the travel system is mounted to the vehicle body;

a power take-off shaft;

a power supply system;

a control system; and

a drive system, wherein said drive system is mounted to said vehicle body, wherein said drive system comprises a main drive motor and said range extender, wherein said main drive motor is electrically connected to said power system, and said travel system is drivably connected to said main drive motor, wherein said power system and said ISG motor are electrically connected to each other, wherein said travel system, said power system, and said drive system are controllably connected to said control system, respectively.

According to an embodiment of the present invention, the control system includes a monitoring unit, a processing unit and a control unit, wherein the monitoring unit is disposed in the driving system, the processing unit is communicably connected to the monitoring unit, and the processing unit is communicably connected to the control unit.

According to an embodiment of the present invention, the range extender has a first operation mode and a second operation mode, the first operation mode, the engine to the ISG motor with the power output shaft output the second operation mode, the engine with the ISG motor to the power output shaft output, the range extender is operable to be switched between the first operation mode and the second operation mode.

According to an embodiment of the present invention, the range extender has a third operating mode in which the internal combustion engine is in a non-operating state, the ISG motor outputs to the power output shaft, wherein the range extender is operable to switch between the first operating mode, the second operating mode and the third operating mode.

According to an embodiment of the present invention, the range extender has a fourth operating mode in which the power output shaft is in a non-operating state, the engine outputs to the ISG motor, wherein the range extender is operable to switch between the first operating mode, the second operating mode, the third operating mode and the fourth operating mode.

Drawings

Fig. 1 is a schematic diagram of an operation of a range extender according to a preferred embodiment of the present invention.

Fig. 2A is a schematic diagram of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 2B is a schematic diagram of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 2C is a schematic diagram of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 2D is a schematic diagram of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 3A is a schematic view of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 3B is a schematic view of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 4 is an operational view of a hybrid tractor according to a preferred embodiment of the present invention.

Fig. 5 is a schematic diagram of a control system according to a preferred embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 1 to 5, a hybrid tractor 1 according to a preferred embodiment of the present invention is illustrated. The hybrid tractor 1 comprises a vehicle body 10, a traveling system 20, a power take-off 30, a driving system 40, a power system 50 and a control system 60, wherein the traveling system 20 is used for driving the vehicle body 10 to move forward or backward, the traveling system 20 is mounted on the vehicle body 10, the power take-off 30 is used for outputting to the outside, the power take-off 30 is mounted on the driving system 40, the driving system 40 is mounted on the vehicle body 10 and is used for driving the vehicle body 10 to travel or output to the outside, the power system 50 is used for storing electric energy and providing electric energy, the power system 50 is electrically connected to the driving system 40, and the control system 60 is used for controlling the driving system 40, the power system 50 and the traveling system 20, wherein said walking system 20, said drive system 40 and said power supply system 50 are each controllably connected to said control system 60.

The drive system 40 includes a main drive motor 41 and a range extender 42, wherein the travel system 20 is drivably connected to the main drive motor 41, wherein the main drive motor 41 is electrically connectable to the power system 50, wherein the range extender 42 is electrically connectable to the power system 50, such that the range extender 42 is electrically connectable to the main drive motor 41 and the power take-off shaft 30 is drivably mounted to the range extender 42.

More specifically, the power take-off shaft 30 is mounted directly to the range extender 42. The range extender 42 includes an engine 421 and an ISG motor 422, wherein the ISG motor 422 is installed between the engine 421 and the power take-off shaft 30, the engine 421 is connected to a rotor shaft of the ISG motor 422, and the power take-off shaft 30 is connected to an output shaft of the ISG motor 422.

The ISG (Integrated-Started-Generator) motor 422 is an Integrated starter Generator. The ISG motor 422 may be used as a generator or as a motor.

The main drive motor 41 is electrically connectable to the ISG motor 422, and when the ISG motor 422 is a generator, the ISG motor 422 may convert mechanical energy into electrical energy during operation, and the electrical energy may then be transferred to the main drive motor 41 for use, or may be stored in the power system 50.

The power system 50 is operably coupled to the ISG motor 422, and when the ISG motor 422 is a generator, the ISG motor 422 may convert mechanical energy into electrical energy during operation, and the electrical energy may then be transferred to the power system 50 for storage by the main drive motor 41 for output to the travel system 20.

The power supply system 50 is electrically connected to the ISG motor 422, that is, the power supply system 50 and the ISG motor 422 are electrically connected to each other. When the ISG motor 422 is a motor, the power supply system 50 supplies power to the ISG motor 422 so that the ISG motor 422 can output power to the outside.

Further, the range extender 42 further comprises a gearbox 423, wherein the gearbox 423 is located between the ISG motor 422 and the power output shaft 30, so that the power output shaft 30 can output the rotational speed in multiple gears. The front end of the gearbox 423 is directly connected to the power output shaft 30 of the ISG motor 422, and the rear end of the gearbox 423 is directly connected to the power output shaft 30. The power of the power output shaft 30 is directly derived from the engine 421, the engine 421 can output at a constant rotational speed, and after the gear shift is performed by the transmission 423, the output requirement of the power output shaft 30 for multiple gears and a constant rotational speed can be satisfied, and the rotational speed of the engine 421 can be kept constant, so that the output rotational speed of the power output shaft 30 can be kept stable.

The gearbox 423 may also be provided within the ISG motor 422 and connected directly to the power take-off shaft 30.

The range extender 42 may also include a range extender controller 424, wherein the engine 421 and the ISG motor 422 are each controllably connected to the range extender controller 424. The gearbox 423 may also be controllably connected to the range extender controller 424. The range-extending controller 424 may control the output of the engine 421 and the operating state of the ISG motor 422 based on an operation command.

It is understood that the power source of the power take-off shaft 30 may be from the ISG motor 422 and the engine 421, and when the ISG motor 422 is an electric motor, the power may be output to the power take-off shaft 30.

With whether the range extender 42 plays a range extending role as a judgment standard, the hybrid tractor 1 has two working states, one is a pure electric working mode, only the main driving motor 41 supplies power to the traveling system 20 at the moment, and the other is a range extending working mode, at the moment, not only the main driving motor 41 can output power to the traveling system 20, but also the ISG motor 422 can output power to the traveling system 20 to meet the output requirement of the traveling system 20 with higher power.

The range extender 42 further includes a flexible coupling 425, wherein the flexible coupling 425 is connected between the engine 421 and the ISG motor 422. That is, the flexible coupling 425 is connected to the engine 421 and the ISG motor 422, respectively, and is located between the engine 412 and the ISG motor 422.

Referring to fig. 2A, 2B, 2C and 2D, the hybrid tractor 1 has four operation modes, i.e., a first operation mode, a second operation mode, a third operation mode and a fourth operation mode, with the power source of the power take-off shaft 30 as a criterion, wherein referring to fig. 2A, the power source of the power take-off shaft 30 and the ISG motor 422 is the engine 421, that is, the engine 421 outputs to the power take-off shaft 30 and the ISG motor 422. The ISG motor 422 is now a generator. The generator is capable of converting mechanical energy from the engine 421 into electrical energy. The output power of the engine 421 and the output power of the power take-off shaft 30 can be maintained at a constant output power due to the characteristics of the hybrid tractor 1 during operation, the output power control of the entire range extender 42 is simpler and more efficient, and the engine 421 needs only a single point of operation.

Referring to fig. 2B, in the second operation mode, the engine 421 and the ISG motor 422 are both used as power sources to output to the power take-off shaft 30, and the power take-off shaft 30 can be applied to a case where a load is large. The ISG motor 422 functions as a motor, and the power supply system 50 can supply power to the ISG motor 422 so that the ISG motor 422 can output to the power take-off shaft 30. In this way, the hybrid tractor 1 can be used under severe conditions.

Referring to fig. 2C, in the third operation mode, the engine 421 stops operating, only the ISG motor 422 outputs power to the power output shaft 30, the power supply system 50 supplies power to the ISG motor 422, for example, when the hybrid tractor 1 is used in situ, the engine 421 may not be started, and the ISG motor 422 is used as a motor. The ISG motor is in an electric mode. In this way, the power output shaft 30 can maintain a quieter use environment when outputting to the outside, and is environmentally friendly.

Referring to fig. 2D, in the fourth operation mode, the power take-off shaft 30 is in a non-operation state, and the engine 421 outputs to the ISG motor 422. The ISG motor 422 is in a generating mode.

The hybrid tractor 1 is switchable among the first operation mode, the second operation mode, the third operation mode, and the fourth operation mode. Specifically, the control system 60 controls the engine 421 and the ISG motor 422 of the range extender 42 to adaptively output according to the magnitude of the load of the power output shaft 30.

Further, the control system 60 comprises a monitoring unit 61, a processing unit 62 and a control unit 63, wherein the monitoring unit 61 and the processing unit 62 are communicably connected to each other, and the processing unit 62 and the control unit 63 are communicably connected to each other.

The monitoring unit 61 is configured to monitor one or more of the driving system 40, the traveling system 20, the power supply system 50, and the power take-off shaft 30.

The monitoring unit 61 collects information of the driving system 40, the traveling system 20, the power supply system 50, and the power take-off shaft 30, the processing unit 62 generates a processing result based on the information collected by the monitoring unit 61, and the control unit 63 controls the driving system 40, the traveling system 20, the power supply system 50, and the power take-off shaft 30 based on the processing result.

Specifically, the monitoring unit 61 may include a traveling system monitoring module 611, a driving system monitoring module 612, a power system monitoring module 613, and a power output shaft monitoring module 614, wherein the driving system monitoring module 612 may further include a main driving motor monitoring module 6121, an engine monitoring module 6122, and an ISG motor monitoring module 6123.

The main driving motor monitoring module 6121, the traveling system monitoring module 611, the power system monitoring module 613, the power output shaft monitoring module 614, the engine monitoring module 6122 and the ISG motor monitoring module 6123 are respectively communicably connected to the processing unit 62.

The main driving motor monitoring module 6121 is configured to monitor a status, for example, a real-time working status, of the main driving motor 41 of the driving system 40. The main driving motor monitoring module 6121 may be disposed at the main driving motor 41 or near the main driving motor 41, for example, the vehicle body 10 near the main driving motor 41.

The walking system monitoring module 611 is configured to monitor a state of the walking system 20 to obtain state information of the walking system 20, where the state information of the walking system 20 may include a power input information of the walking system 20 and a power output information of the walking system 20. The state information of the traveling system 20 includes load information of the traveling system 20, that is, information that the traveling system 20 needs to output.

The power system monitoring module 613 is configured to monitor the status of the power system 50 to obtain status information of the power system 50. The status information of the power system 50 may include a power input information and a power output information of the power system 50. The status information of the power system 50 may include load information of the power system 50, that is, information that the power system 50 needs to output externally, for example, the electric quantity that the walking system 20 needs to provide when operating.

The pto shaft monitoring module 614 is configured to monitor the state of the pto shaft 30 to obtain state information of the pto shaft 30, where the state information of the pto shaft 30 may include a power input information and a power output information of the pto shaft 30. The state information of the power output shaft 30 may include load information of the power output shaft 30, that is, information that the power output shaft 30 needs to output to the outside, for example, kinetic energy that needs to be provided when the power output shaft 30 operates. The load of the power output shaft 30 is determined by the equipment connected to the power output shaft 30, and the power output shaft 30 can provide enough kinetic energy to the working object to drive the external equipment to work.

The engine monitoring module 6122 is configured to monitor a state of the engine 421 to obtain state information of the engine 421, where the state information of the engine 421 may include fuel information, a rotation speed information, and an output power information of the engine 421. The state information of the engine 421 may include load information of the engine 421, that is, information that the engine 421 needs to output to the outside, for example, kinetic energy that the engine 421 needs to provide to the power output shaft 30. The load of the engine 421 is mainly determined by the ISG motor 422 and the power take-off shaft 30. When the ISG motor 422 is a generator, the engine 421 needs to output to both the ISG motor 422 and the power take-off shaft 30. When the ISG is an electric motor, the engine 421 only needs to output to the power output shaft 30. When the power take-off shaft 30 is lightly loaded and is working in place, the engine 421 may be stopped while the ISG motor 422 is used as a motor to supply power to the power take-off shaft 30.

The ISG motor monitoring module 6123 is configured to monitor a working state of the ISG motor 422, especially a real-time working state of the ISG motor 422, so as to obtain state information of the ISG motor 422. The state information of the ISG motor 422 may include a rotation speed information, a torque information, an input power information and an output power information of the ISG motor 422. The state information of the ISG motor 422 may include load information of the ISG motor 422, that is, information that the ISG motor 422 needs to output to the outside, for example, information that is output to the power supply system 50 or the power output shaft 30. The state of the ISG motor 422 can be adjusted according to the needs of the power take-off shaft 30 and the traveling system 20. That is, the ISG motor 422 may operate as a motor or as the engine 421. When the ISG motor 422 operates as a motor, the power take-off shaft 30 can obtain a power source from the ISG motor 422, and the power supply system 50 supplies power to the ISG motor 422. When the ISG motor 422 operates as a generator, the ISG motor 422 supplies power to the power supply system 50.

It will be appreciated that the hybrid tractor 1 may include a plurality of detectors and/or sensors, and the hybrid tractor 1 may include at least one processor to which the detectors or sensors, respectively, are communicatively coupled. The processing unit 62 may be communicatively coupled to the processor, or the processing unit 62 may be integrated or partially integrated with the processor. The monitoring unit 61 may be communicatively connected to the detector and/or sensor. The monitoring unit 61 may also be integrated or partly integrated with the detector or the sensor.

The main driving motor monitoring module 6121, the traveling system monitoring module 611, the power supply system monitoring module 613, the power output shaft monitoring module 614, the engine monitoring module 6122 and the ISG motor monitoring module 6123 of the monitoring unit 61 may be respectively communicably connected to the detector and/or the sensor, or the main driving motor monitoring module 6121, the traveling system monitoring module 611, the power supply system monitoring module 613, the power output shaft monitoring module 614, the engine monitoring module 6122 and the ISG motor monitoring module 6123 may be integrated or partially integrated with the detector and/or the sensor. The main driving motor monitoring module 6121, the traveling system monitoring module 611, the power supply system monitoring module 613, the power output shaft monitoring module 614, the engine monitoring module 6122 and the ISG motor monitoring module 6123 of the monitoring unit 61 may be respectively integrated with a corresponding detector or sensor, or at least two of the main driving motor monitoring module 6121, the traveling system monitoring module 611, the power supply system monitoring module 613, the power output shaft monitoring module 614, the engine monitoring module 6122 and the ISG motor monitoring module 6123 may be integrated with the same detector and/or the same sensor.

It will be understood by those skilled in the art that the above-mentioned arrangement of the monitoring unit 61 is only for illustration and is not intended to limit the present invention.

The processing unit 62 generates a processing result based on information obtained by monitoring or detecting the main driving motor monitoring module 6121, the traveling system monitoring module 611, the power supply system monitoring module 613, the power output shaft monitoring module 614, the engine monitoring module 6122 and the ISG motor monitoring module 6123 of the monitoring unit 61, and the control unit 63 controls the traveling system 20, the power output shaft 30, the power supply system 50 and the driving system 40 based on the processing result of the processing unit 62.

For example, when the monitoring unit 61 monitors that the load of the power take-off shaft 30 increases to exceed the rated output of the engine 421, the processing unit 62 generates a processing result, the control unit 63 controls the ISG motor 422 of the driving system 40 to change from a power generation state to a motor state, and the power supply system 50 supplies power to the ISG motor 422, so that the output of the driving system 40 to the power take-off shaft 30 increases, the load range of the power take-off shaft 30 increases, and the power take-off shaft 30 can bear worse working conditions.

For example, when the monitoring unit 61 detects that the load of the power output shaft 30 is small, the traveling system 20 does not need to operate. The processing unit 62 generates a processing result, and the control unit 63 controls the ISG motor 422 of the driving system 40 to operate in a motor state, and the engine 421 stops outputting to the outside. That is, the power of the power take-off shaft 30 is derived from the ISG motor 422, and the ISG motor 422 generates kinetic energy using the electric energy from the power supply system 50 and then operates the power take-off shaft 30. In this way, the hybrid tractor 1 can provide quiet and clean energy in a working state with low energy consumption, and creates a good working environment for users.

For example, when the monitoring unit 61 detects that the power take-off shaft 30 requires a certain load, and the traveling system 20 needs to travel at a certain speed, the processing result is based on the load of the power take-off shaft 30 detected by the power take-off shaft monitoring module 614 of the monitoring unit 61 and the load of the traveling system 20 detected by the traveling system monitoring module 611 of the traveling system 20, and the monitoring data of the walking system monitoring module 611, the main driving motor monitoring module 6121 and the power output shaft monitoring module 614 of the monitoring unit 61 generate a processing result, the control unit 63 controls the engine 421 to output a certain power based on the processing result, the power take-off shaft 30 obtains a part of the kinetic energy of the engine 421 output outward to output a load satisfying the demand. The ISG motor 422 obtains a part of the kinetic energy output from the engine 421, and the power supply system 50 and the main drive motor 41 cooperate to provide an output satisfying the demand to the traveling system 20.

In this way, the hybrid tractor 1 can meet different working conditions, and adapt to different loads and outputs to adjust the working modes of the driving system 40 and the power supply system 50.

It should be noted that the engine 421 has a better working area, and when the engine 421 works in this working area, the engine 421 can satisfy the output of high efficiency to the outside while maintaining a better fuel efficiency, so as to achieve the purpose of saving fuel. For a conventional tractor, the power of the power output shaft 30 during the operation of the tractor is directly derived from the engine 421, and the engine 421 of the tractor cannot be maintained in a better working area, so that the whole tractor has high oil consumption during the operation, and the purpose of saving energy cannot be achieved. The preferred working region may be preset, and the hybrid tractor 1 may be maintained to work within a predetermined working region, which is a preferred working region, so that the operation of the hybrid tractor 1 can be economized.

More specifically, the main driving motor monitoring module 6121, the traveling system monitoring module 611, the power system monitoring module 613 and the power output shaft monitoring module 614 of the monitoring unit 61 respectively monitor the main driving motor 41, the traveling system 20, the power system 50 and the power output shaft 30 in real time.

The traveling system monitoring module 611 and the power output shaft monitoring module 614 detect the output required by the traveling system 20 and the load of the power output shaft 30, respectively. The output of the walking system 20 obtained by the walking system 20 monitoring system may be an instruction from a user, for example, when the user controls the walking speed and the walking direction of the walking system 20 by operating an operation interface, the walking system monitoring module 611 may obtain the output information required by the walking system 20.

The processing unit 62 obtains a real-time working state of the power system 50, the main driving motor 41, the ISG motor 422 and the engine 421 based on the power system monitoring module 613, the main driving motor monitoring module 6121, the ISG motor monitoring module 6123 and the engine monitoring module 6122, and analyzes a working mode of the ISG motor 422 and obtains a processing result on the premise that a requirement output by the traveling system 20 and the power output shaft 30 is met and a preferred working area of the engine 421 is not exceeded. The control system 60 controls the working mode of the ISG motor 422 through the processing result so that the overall output of the driving system 40 can meet the output requirement of the traveling system 20 and the power output shaft 30, and simultaneously the engine 421 can be maintained in a better working area, so that the fuel efficiency of the engine 421 is maintained at a higher utilization rate, and the purpose of saving fuel is achieved.

For example, in the current state, when the engine 421 is located in the preferred working area, and the power output shaft monitoring module 614 monitors that the load of the power output shaft 30 is suddenly increased, the output power of the engine 421 needs to be increased to meet the increased load of the power output shaft 30, however, if the output power of the engine 421 is increased to meet the requirement of the power output shaft 30, the engine 421 will not work in the preferred working area, and the efficiency of the whole engine 421 will be reduced. At this time, the processing unit 62 generates a processing result based on the monitoring data of the monitoring unit 61, and the input of the ISG motor 422 is lowered to enable the engine 421 to increase the input to the power take-off shaft 30 while maintaining a preferred operation region. Even more, the ISG motor 422 can be switched from a generator operation mode to a motor operation mode to enable the engine 421 to be in a preferred operation region while satisfying the power output of the power take-off shaft 30.

For example, in the current state, the engine 421 is located in the preferred working area, and the pto shaft monitoring module 614 monitors that the load of the pto shaft 30 is suddenly reduced, the output power of the engine 421 may be reduced, but the engine 421 needs to be maintained within a certain load to be in the preferred working area.

In order to satisfy the output demand of the power take-off shaft 30 and simultaneously keep the engine 421 in a preferred operating state, the processing unit 62 generates a processing result based on the monitoring unit 61, and the control unit 63 adjusts the ISG motor 422 based on the processing result so that the engine 421 can be maintained in a preferred operating region and the output demand of the power take-off shaft 30 can be satisfied. That is, the ISG motor 422 can be coupled to the engine 421 so that the engine 421 can be maintained in a preferable operation state while satisfying the demand for external output.

In this way, the entire hybrid tractor 1 will be in an efficient operating state. The internal energy of the fuel can be converted into mechanical energy with high efficiency.

Further, the hybrid tractor 1 can achieve dynamic coupling of the output power of the power take-off shaft 30 and the output power of the traveling system 20, thereby achieving a great advantage of the conventional internal combustion engine type tractor on the hybrid tractor.

Specifically, for example, the engine 421 of the hybrid tractor 1 is currently in an operating state, and the ISG motor 422 is in a power generation operating mode and is output toward the power supply system 50. The load of the power take-off shaft 30 is increased, and in order to maintain the operating state of the engine 421 within a preferred operating region, the operating state of the ISG motor 422 needs to be adjusted to meet the power demand for the power take-off shaft 30.

The processing unit 62 analyzes the data collected by monitoring, and then generates a processing result, and the control unit 63 controls the ISG motor 422, the power supply system 50, and the main driving motor 41, respectively. The output of the ISG motor 422 to the power supply system 50 is reduced, and in order to meet the output requirement of the traveling system 20, the output of the power supply system 50 to the main driving motor 41 is increased or the output power of the main driving motor 41 is increased to meet the output requirement of the traveling system 20, so that the dynamic coupling of the power output shaft 30 and the power supply system 50, the main driving motor 41 and the traveling system 20 is realized.

Further, for example, the engine 421 of the hybrid tractor 1 is currently in an operating state, and the ISG motor 422 is in a power generation operating mode and is output toward the power supply system 50. The load of the power take-off shaft 30 is reduced and in order to maintain the operating state of the engine 421 within a preferred operating region, the operating state of the ISG motor 422 needs to be adjusted to meet the power demand for the power take-off shaft 30.

The processing unit 62 analyzes the data collected by monitoring, and then generates a processing result, and the control unit 63 controls the ISG motor 422, the power supply system 50, and the main driving motor 41, respectively. The output of the ISG motor 422 to the power supply system 50 is increased, and in order to meet the output requirement of the traveling system 20, the output of the power supply system 50 to the main driving motor 41 is decreased or the output power of the main driving motor 41 is decreased to meet the output requirement of the traveling system 20, so that the dynamic coupling of the power output shaft 30 and the power supply system 50, the main driving motor 41 and the traveling system 20 is realized.

According to another aspect of the present invention, the present invention provides a power output system 100, wherein the power output system 100 includes the power output shaft 30 and the range extender 42, wherein the power output shaft 30 is drivably connected to the range extender 42.

The power output system 100 is configured to provide power to the outside, and the power output system 100 has four operation modes, in a first operation mode, the engine 421 of the range extender 42 outputs power to the ISG motor 422 and the power output shaft 30, respectively, in a second operation mode, the engine 421 of the range extender 42 and the ISG motor 422 output power to the power output shaft 30 at the same time, in a third operation mode, the ISG motor 422 of the range extender 42 outputs power to the power output shaft 30, and the engine 421 stops operating. In the fourth operation mode, the power output shaft 30 stops operating, and the engine 421 supplies power to the ISG motor 422.

In other embodiments of the present invention, the power output system 100 has two operation modes, the first operation mode and the second operation mode, the first operation mode, the engine 421 of the range extender 42 outputs power to the ISG motor 422 and the power output shaft 30 respectively, and the second operation mode, the engine 421 of the range extender 42 and the ISG motor 422 output power to the power output shaft 30 simultaneously.

In other embodiments of the present invention, the power output shaft 30 has two working modes, the first working mode and the third working mode, the first working mode, the engine 421 of the range extender 42 outputs power to the ISG motor 422 and the power output shaft 30 respectively, the third working mode, the ISG motor 422 of the range extender 42 outputs power to the power output shaft 30.

The power take-off system 100 further includes a power take-off control unit, wherein the power take-off control unit includes a power take-off monitor communicably coupled to the power take-off processor, a power take-off processor communicably coupled to the power take-off controller, and a power take-off controller.

The pto monitor may be used to monitor the pto shaft 30 and/or the range extender 42, and the pto shaft monitor may also be used to monitor the main drive motor and the power system.

The range extender 42 and/or the power take-off shaft 30 and/or the main drive motor and/or the power supply system are controllably connected to the power take-off controller, respectively.

A method of operating the power take-off system 100 includes the steps of:

acquiring the output demand of the power output shaft 30 by the power output monitor; and

the operating mode of the range extender 42 is selected based on the output demand of the power take-off shaft 30.

It is worth mentioning that the power output system 100 is capable of maintaining the engine 421 in a preset operation region and satisfying the output requirement of the power output shaft 30 when the engine 421 operates. The predetermined operation region is a preferred operation region of the engine 421 in which fuel can be efficiently converted into mechanical energy.

In the above method, the range extender 42 has the first operation mode in which the power of the power take-off shaft 30 and the ISG motor 422 is derived from the engine 421, the second operation mode in which the power of the power take-off shaft 30 is derived from the engine 421 and the ISG motor 422, the third operation mode in which the power of the power take-off shaft 30 is derived from the ISG motor 422, the third operation mode in which the engine 421 is output to the ISG motor 422, and the fourth operation mode in which the power take-off shaft 30 stops operating.

According to some embodiments of the present invention, in the above method, when the output demand of the power output shaft 30 exceeds the predetermined operating region of the engine 421, the range extender 42 is switched from the first operating mode to the second operating mode.

According to some embodiments of the present invention, in the above method, when the range extender 42 is located in the second operation mode and the output demand of the power output shaft 30 is changed, the output demand of the power output shaft 30 is satisfied by adjusting the operation state of the ISG motor 422 on the premise of maintaining the engine 421 in the predetermined operation region.

According to some embodiments of the present invention, in the above method, when the output demand of the power output shaft 30 is lower than the output of the engine 421 in the preset operation region, the second operation mode is switched to the first operation mode.

According to some embodiments of the present invention, in the above method, when the range extender 42 is in the first operating mode and the output demand of the power output shaft 30 changes, the output demand of the power output shaft 30 is satisfied by adjusting the operating state of the ISG motor 422 on the premise of maintaining the engine 421 in the predetermined operating region.

According to another aspect of the present invention, the present invention provides a control method of the power output system 100, applied to the hybrid tractor, wherein the control method comprises the steps of:

monitoring the load of the power output shaft 30 while outputting power by the power output system 100; and

in response to the load of the power take-off shaft 30, the output of the ISG motor 422 is adjusted to maintain the engine 421 in the preset operation region while satisfying the load of the power take-off shaft 30.

According to another aspect of the present invention, the present invention provides a working method of the hybrid tractor 1, wherein the working method comprises the following steps:

acquiring a required output of the power take-off shaft 30 of the hybrid tractor 1; and

switching an operation mode of the range extender 42 of the hybrid tractor 1 based on a required output of the pto 30, wherein the range extender 42 includes the engine 421 and the ISG motor 422, the ISG motor 422 is drivably connected to the engine 421, and the pto 30 is connected to the ISG motor 422 and drivably connected to the engine 421 and the ISG motor 422, respectively.

According to some embodiments of the present invention, the range extender 42 has the first operation mode, the second operation mode, the third operation mode and the fourth operation mode, wherein in the first operation mode, the power of the power output shaft 30 and the ISG motor 422 is derived from the engine 421, in the second operation mode, the power of the power output shaft 30 is derived from the engine 421 and the ISG motor 422, in the third operation mode, the power of the power output shaft 30 is derived from the ISG motor 422, in the fourth operation mode, the engine 421 outputs to the ISG motor 422, and the power output shaft 30 stops operating.

According to some embodiments of the present invention, the demand output of the power output shaft 30 exceeds the preset working area of the engine 421, from the first working mode is switched to the second working mode.

According to some embodiments of the present invention, when the range extender 42 is located in the second operation mode, and the load of the power output shaft 30 changes, the operation state of the ISG motor 422 is adjusted to satisfy the output to the power output shaft 30 while maintaining the engine 421 in the preset operation region.

According to some embodiments of the present invention, based on the working state change of the ISG motor 422 adjusts the working state of a main driving motor 41 to satisfy the output demand of the traveling system 20 of the hybrid tractor, wherein the traveling system 20 is drivably connected to the main driving motor 41.

According to some embodiments of the present invention, when the required output of the power output shaft 30 is lower than the output of the engine 421 in the preferred working area, the second working mode is switched to the first working mode.

According to some embodiments of the invention, wherein in the above method, the working method further comprises the steps of:

acquiring the output requirement of the walking system 20; and

the operation mode of the range extender 42 is switched based on the output demand of the power take-off shaft 30 and the output demand of the traveling system 20.

Specifically, the monitoring unit 61 obtains the output requirements of the traveling system 20 and the power output shaft 30, the processing unit 62 generates a processing result, and the control unit 63 controls the driving system based on the processing result so as to meet the output requirements of the traveling system 20 and the power output shaft 30, respectively.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. A range extender adapted for engagement with a power take-off shaft of a hybrid tractor, comprising:

an engine;

an ISG motor, wherein said ISG motor is drivably connected to said engine; and

2. The range extender of claim 1, further comprising a gearbox, wherein both ends of the gearbox are connected to the ISG motor and the power take-off shaft, respectively.

3. The range extender of claim 1, wherein the range extender has a first operating mode in which the engine outputs to the ISG motor and the power take-off shaft, the ISG motor being in a generating mode, and a second operating mode in which the engine and the ISG motor output to the power take-off shaft, the ISG motor being in a motoring mode, wherein the range extender is operable to switch between the first operating mode and the second operating mode.

4. The range extender of claim 3, wherein the range extender has a third operating mode in which the engine is not operating, the ISG motor is outputting to the power output shaft, and the ISG motor is in an electric mode, wherein the range extender is operable to switch between the first operating mode, the second operating mode, and the third operating mode.

5. The range extender of claim 4, wherein the range extender has a fourth operating mode in which the power take-off shaft is not operational, the engine outputs to the ISG generator, and the ISG motor is in a generating mode, wherein the range extender is operable to switch between the first, second, third, and fourth operating modes.

6. The range extender of any of claims 1-5 further comprising a range extender controller, wherein said engine and said ISG motor are each controllably connected to said range extender controller.

7. A power take-off system, comprising:

a power take-off shaft; and

the range extender of any one of claims 1 to 6 wherein the power output shaft is connected to the range extender.

8. A power take off system as defined in claim 7, further comprising a main drive motor and a power system, wherein the main drive motor is electrically connectable to the power system, wherein the ISG motor is electrically connectable to the engine, and the power system and the ISG motor are electrically connectable to each other.

9. A hybrid tractor, comprising:

a vehicle body;

a travel system, wherein the travel system is mounted to the vehicle body;

a power take-off shaft;

a power supply system;

a control system; and

a drive system, wherein the drive system is mounted to the vehicle body, wherein the drive system comprises:

a main drive motor; and

a range extender, wherein said range extender comprises an engine, an ISG motor, and a flexible coupling, wherein said ISG motor is drivably connected to said engine, wherein said flexible coupling is connected between said engine and said ISG motor, wherein said power take-off shaft is drivably connected to said ISG motor, wherein said main drive motor is drivably connected to said power system, and said travel system is drivably connected to said main drive motor, wherein said power system and said ISG motor are mutually drivably connected, wherein said travel system, said power system, and said drive system are respectively controllably connected to said control system.

10. The hybrid tractor according to claim 9, wherein the control system includes a monitoring unit, a processing unit, and a control unit, wherein the monitoring unit is provided to the drive system, the processing unit and the monitoring unit are communicably connected to each other, and the processing unit and the control unit are communicably connected to each other.

11. The hybrid tractor according to claim 10, wherein the range extender has a first operating mode in which the engine outputs to the ISG motor and the power take-off shaft and a second operating mode in which the engine and the ISG motor output to the power take-off shaft, the range extender being operable to switch between the first operating mode and the second operating mode.

12. The hybrid tractor according to claim 11, wherein the range extender has a third operating mode in which the engine is in a non-operating state and the ISG motor outputs to the power output shaft, wherein the range extender is operable to switch between the first operating mode, the second operating mode, and the third operating mode.

13. The hybrid tractor according to claim 12, wherein the range extender has a fourth operating mode in which the power take-off shaft is not operational and the engine outputs to the ISG motor, wherein the range extender is operable to switch between the first operating mode, the second operating mode, the third operating mode and the fourth operating mode.