CN110790196A - Medium-large tonnage electric forklift integrated power system and control method thereof - Google Patents
Medium-large tonnage electric forklift integrated power system and control method thereof Download PDFInfo
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- CN110790196A CN110790196A CN201911185675.7A CN201911185675A CN110790196A CN 110790196 A CN110790196 A CN 110790196A CN 201911185675 A CN201911185675 A CN 201911185675A CN 110790196 A CN110790196 A CN 110790196A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07572—Propulsion arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07563—Fork-lift trucks adapted to be carried by transport vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07568—Steering arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07595—Cooling arrangements for device or operator
Abstract
The invention discloses a medium and large tonnage electric forklift integrated power system and a control method thereof, which are used for solving the problems that the conventional medium and large tonnage electric forklift driving and hydraulic power system has a single technical route, large energy consumption of the whole forklift, and difficult realization of heat dissipation efficiency and function, so that the structure is very complex and the cost is greatly increased; the system comprises a driving power subsystem, a hydraulic power subsystem and an upper power control subsystem; the integrated power system of the electric forklift is highly integrated and compactly arranged, is completely integrated into a unified whole in structure, does not need distributed arrangement, has simple structure, is convenient for the installation of the whole forklift, and greatly improves the integration level and the reliability of the power system; meanwhile, the integrated power system greatly reduces or even cancels external cable connection among all parts, reduces the resistance generated by overlong cables while reducing the assembling and installing procedures by reducing the length of the cables, improves the operating efficiency of the power system and prolongs the operation time of the forklift.
Description
Technical Field
The invention belongs to the field of electric forklifts, relates to a driving and hydraulic integration technology of an electric forklift, and particularly relates to an integrated power system of a medium-tonnage and large-tonnage electric forklift and a control method thereof.
Background
The market of the Chinese forklift has wide development space, and particularly the market potential of the electric forklift is huge. With the continuous development of economy, higher requirements are put on the driving of the electric forklift and a hydraulic power system.
The electric forklift with medium and large tonnage generally refers to an electric forklift with 5 tons or more, the technical route of the existing electric forklift driving and hydraulic power system with medium and large tonnage is single, a driving motor and a front axle reducer are basically adopted to form a walking power unit, an oil pump motor and an oil pump form a hydraulic power unit, and a driving motor controller and an oil pump motor controller are separately arranged to form a motor control unit; the whole power system adopts a large-range decentralized arrangement mode, the walking power unit is arranged at the front axle of the vehicle body, the hydraulic power unit is arranged in the middle or at the rear part of the vehicle body, and the motor control unit is arranged in the middle or at the rear part of the vehicle body; in the system, the walking power unit and the hydraulic power unit are far away from the motor control unit, the length of a connecting cable is too long, the whole vehicle assembly is not facilitated, the cost is increased due to the too long cable, the electric energy use efficiency is influenced, and finally the energy consumption of the whole vehicle is greatly increased; for the state that the driving and hydraulic power system is distributed in a large-scale mode, the heat dissipation efficiency and the function are not easy to achieve, and each unit needs to be cooled or dissipated independently, so that the structure is very complex, and the cost is greatly increased.
Therefore, the driving and hydraulic power system of the electric forklift needs a high-efficiency driving and hydraulic integrated power system which is highly integrated in structure and can realize centralized arrangement, so that the system cost is reduced and the system efficiency is improved.
Disclosure of Invention
The invention aims to provide an integrated power system of a medium-large tonnage electric forklift and a control method thereof; the electric forklift hydraulic power system is used for solving the problems that the existing electric forklift driving and hydraulic power system with medium and large tonnage has a single technical route, the walking power unit and the hydraulic power unit are far away from the motor control unit, the length of a connecting cable is too long, the whole forklift is not convenient to assemble, the cost is increased due to the too long cable, the electric energy use efficiency is influenced, and the energy consumption of the whole forklift is greatly increased finally; for the state that the driving and hydraulic power system is dispersedly arranged in a large range, the heat dissipation efficiency and the function are not easy to realize, and each unit needs to be independently cooled or dissipated, so that the structure is very complex, and the cost is greatly increased.
The purpose of the invention can be realized by the following technical scheme: an integrated power system of a medium-tonnage and large-tonnage electric forklift comprises a driving power subsystem, a hydraulic power subsystem and an upper power control subsystem;
the driving power subsystem comprises a driving motor, a parallel shaft speed reducer and a driving motor control unit; the output shaft of the driving motor is coaxially connected with the input shaft of the parallel shaft speed reducer through a spline; the parallel shaft speed reducer comprises a plurality of groups of gear shafts which are arranged in parallel, each pair of paired gear sets on the gear shafts are meshed with each other, and a differential is arranged on the last stage output gear shaft, wherein the plurality of groups of gear shafts are all arranged on a speed reducer shell through bearings; the driving motor control unit is arranged in the two-in-one motor controller;
the hydraulic power subsystem comprises an oil pump motor, an oil pump motor transmission mechanism, a first oil pump, a second oil pump and an oil pump motor control unit; the oil pump motor is fixedly connected to one side of the shell of the parallel shaft speed reducer; the transmission mechanism of the oil pump motor is fixedly arranged at the output end of the oil pump motor; the output shaft of the oil pump motor is coaxially connected with the input shaft of the oil pump motor transmission mechanism through a spline; the input shafts of the first oil pump and the second oil pump are respectively connected with two output shafts of the oil pump motor transmission mechanism through splines; the oil pump motor control unit is arranged in the two-in-one motor controller;
the two-in-one motor controller is fixedly supported on the driving motor and the oil pump motor through a plurality of supporting points;
the upper power control subsystem comprises an upper power system controller, and the upper power system controller is fixedly arranged on the two-in-one motor controller and is electrically connected with the two-in-one motor controller;
the driving motor, the parallel shaft speed reducer, the oil pump motor transmission mechanism, the first oil pump, the second oil pump, the two-in-one motor controller and the upper power system controller are integrated into a whole electric forklift power system through a fixed connection mode.
Preferably, the oil pump motor transmission mechanism comprises an input shaft, a first output shaft and a second output shaft, and the input shaft, the first output shaft and the second output shaft are all fixedly mounted on the oil pump motor transmission mechanism shell through bearings; an input shaft gear is fixedly connected to an input shaft of the oil pump motor transmission mechanism; a first output shaft gear and a second output shaft gear are fixedly connected to a first output shaft and a second output shaft of the oil pump motor transmission mechanism respectively; an input shaft gear of the oil pump motor transmission mechanism is simultaneously meshed with one ends of the first output shaft gear and the second output shaft gear which correspond to each other; the number of teeth of a first output shaft gear and a second output shaft gear of the oil pump motor transmission mechanism is more than that of the teeth of the input shaft gear, and meanwhile, the teeth of the first output shaft gear and the second output shaft gear are the same or different;
preferably, the three-phase power line and the low-voltage signal line of the driving motor and the two-in-one motor controller are connected inside the shell of the driving motor and the two-in-one motor controller; the three-phase power line and the low-voltage signal line of the oil pump motor and the two-in-one motor controller are connected in the shell of the oil pump motor and the two-in-one motor controller;
preferably, the first oil pump and the second oil pump are respectively and independently matched, and the first oil pump and the second oil pump are single oil pumps or double pumps;
preferably, the external electrical connection of the driving power subsystem and the hydraulic power subsystem comprises a high-voltage positive and negative direct current connector and a low-voltage signal connector which are arranged on the two-in-one motor controller.
Preferably, driving motor, oil pump motor and two unification machine controller all cool off through the liquid cooling mode, and the cooling water route is established ties with integrated driving system internal integration.
Preferably, the parallel shaft transmission comprises an output flange plate on the shell, and the output flange plate and a tooth packet flange plate of a front axle of the electric forklift are fixedly connected into a whole after being positioned through a spigot.
Preferably, the parallel shaft transmission comprises auxiliary supporting and fixing feet on the shell, and the auxiliary supporting and fixing feet are fixedly connected with supporting arms on the frame of the electric forklift through bolts; and an electronic heat dissipation water pump is arranged on the auxiliary support fixing foot.
Preferably, the two-in-one motor controller is a motor controller integrating a driving motor and an oil pump motor.
A control method for an integrated power system of a medium-tonnage and large-tonnage electric forklift is realized through an upper power control subsystem, and comprises the following steps:
the method comprises the following steps: the upper power system controller receives signals from various human-computer operating systems and signals from a BMS battery management system;
step two: the upper power system controller is used for processing signals of a man-machine operation system and signals of a BMS battery management system, comprehensively driving state requirements of a hydraulic power part according to conditions such as various state information of the BMS battery management system signals, allowed electric quantity use information and the like, distributing power to each subsystem according to needs and quantities, and meanwhile, carrying out control instructions according to vehicle running and operation states and outputting the control instructions to the two-in-one motor controller so as to coordinate and control the two-in-one motor controller;
step three: the driving motor and the oil pump motor are controlled by the two-in-one motor controller, so that the driving operation of the electric forklift, the hydraulic steering and the hydraulic transmission execution action of the electric forklift are realized;
compared with the prior art, the invention has the beneficial effects that:
1. the driving motor, the parallel shaft speed reducer, the oil pump motor transmission mechanism, the first oil pump, the second oil pump, the two-in-one motor controller and the upper power system controller are all integrated into an integral power system of the electric forklift in a fixed connection mode, the power system of the electric forklift is highly integrated and compactly arranged, is completely integrated into an integral whole in structure, does not need distributed arrangement, is simple in structure, facilitates the installation of a whole forklift, and greatly improves the integration level and the reliability of the power system; meanwhile, the integrated power system greatly reduces or even cancels external cable connection among all parts, reduces the resistance generated by overlong cables while reducing the assembling and installing procedures by reducing the length of the cables, improves the operating efficiency of the power system and prolongs the operation time of the forklift;
2. driving motor, oil pump motor and two unification machine controller all cool off through the liquid cooling mode, and the cooling water route is the integrated series connection in integrated driving system inside, through integrated form liquid cooling system, reduce electric fork truck drive and hydraulic power subsystem's temperature rise by a wide margin, improve integrated driving system's reliability, increase of service life, satisfy more rigorous electric fork truck operation requirement.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic overall structure diagram of the integrated power system of the novel medium-large tonnage electric forklift;
FIG. 2 is a schematic overall structure diagram of the integrated power system of the novel medium-large tonnage electric forklift;
FIG. 3 is a schematic diagram of the control method of the integrated power system of the novel medium-large tonnage electric forklift truck according to the invention;
FIG. 4 is a schematic structural diagram of an oil pump motor transmission mechanism of the present invention;
FIG. 5 is a view in the direction A of the overall structure of FIG. 1;
FIG. 6 is a view in the direction B of the overall structure of FIG. 1;
FIG. 7 is a view in the direction C of the overall structure of FIG. 2;
FIG. 8 is a D-view of the overall schematic of FIG. 2;
FIG. 9 is a view in the direction E of the overall structure of FIG. 1;
fig. 10 is a view in the direction F of the overall structure diagram of fig. 2.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-10, an integrated power system for a medium-and large-tonnage electric forklift includes a driving power subsystem, a hydraulic power subsystem, and an upper power control subsystem;
the driving power subsystem comprises a driving motor 1, a parallel shaft speed reducer 2 and a driving motor control unit 301; an output shaft of the driving motor 1 is coaxially connected with an input shaft of the parallel shaft speed reducer 2 through a spline; the parallel shaft speed reducer 2 comprises a plurality of groups of gear shafts which are arranged in parallel, each pair of paired gear sets on the gear shafts are meshed with each other, and a differential is arranged on the last stage output gear shaft, wherein the plurality of groups of gear shafts are all arranged on a speed reducer shell through bearings; the driving motor control unit 301 is arranged inside the two-in-one motor controller 3;
the hydraulic power subsystem comprises an oil pump motor 4, an oil pump motor transmission mechanism 5, a first oil pump 6, a second oil pump 7 and an oil pump motor control unit 302; the oil pump motor 4 is fixedly connected to one side of the shell of the parallel shaft speed reducer 2; the oil pump motor transmission mechanism 5 is fixedly arranged at the output end of the oil pump motor 4; the output shaft of the oil pump motor 4 is coaxially connected with the input shaft of the oil pump motor transmission mechanism 5 through a spline; the input shafts of the first oil pump 6 and the second oil pump 7 are respectively connected with two output shafts of the oil pump motor transmission mechanism 5 through splines; the oil pump motor control unit 302 is arranged inside the two-in-one motor controller 3;
the two-in-one motor controller 3 is fixedly supported on the driving motor 1 and the oil pump motor 4 through a plurality of supporting points;
the upper power control subsystem comprises an upper power system controller 9, and the upper power system controller 9 is fixedly arranged on the two-in-one motor controller 3 and is electrically connected with the two-in-one motor controller 3;
the driving motor 1, the parallel shaft speed reducer 2, the oil pump motor 4, the oil pump motor transmission mechanism 5, the first oil pump 6, the second oil pump 7, the two-in-one motor controller 3 and the upper power system controller 9 are all integrated into a whole electric forklift power system in a fixed connection mode;
the oil pump motor transmission mechanism 5 comprises an input shaft 505, a first output shaft 502 and a second output shaft 507, and the input shaft 505, the first output shaft 502 and the second output shaft 507 are all fixedly arranged on the oil pump motor transmission mechanism shell 503 through bearings; an input shaft gear 501 is fixedly connected to an input shaft 505 of the oil pump motor transmission mechanism 5; a first output shaft gear 504 and a second output shaft gear 506 are fixedly connected to a first output shaft 502 and a second output shaft 507 of the oil pump motor transmission mechanism 5 respectively; an input shaft gear 501 of the oil pump motor transmission mechanism 5 is meshed with one corresponding ends of a first output shaft gear 504 and a second output shaft gear 506 at the same time; the number of teeth of the first output shaft gear 504 and the second output shaft gear 506 of the oil pump motor transmission mechanism 5 is more than that of the input shaft gear 501, and meanwhile, the number of teeth of the first output shaft gear 504 and the second output shaft gear 506 is the same or different;
the three-phase power line and the low-voltage signal line of the driving motor 1 and the two-in-one motor controller 3 are connected in the shell of the driving motor 1 and the two-in-one motor controller 3; the three-phase power line and the low-voltage signal line of the oil pump motor 4 and the two-in-one motor controller 3 are connected in the shell of the oil pump motor 4 and the two-in-one motor controller 3;
the first oil pump 6 and the second oil pump 7 can be respectively and independently matched, and the first oil pump 6 and the second oil pump 7 are single oil pumps or double pumps; the first oil pump 6 and the second oil pump 7 can be configured in the same way or in different ways; the first oil pump 6 and the second oil pump 7 are both single oil pumps or the first oil pump 6 is a single oil pump and the second oil pump 7 is a double pump;
the external electrical connection of the driving power subsystem and the hydraulic power subsystem comprises a high-voltage positive and negative direct current connector 303 and a low-voltage signal connector 304 which are arranged on the two-in-one motor controller 3;
the driving motor 1, the oil pump motor 4 and the two-in-one motor controller 3 are cooled in a liquid cooling mode, and a cooling water path is an integrated series connection mode inside the integrated power system;
the parallel shaft transmission 2 comprises an output flange plate 201 on a shell, and the output flange plate 201 and a tooth packet flange plate of a front axle of the electric forklift are positioned through a spigot and then fixedly connected into a whole;
the parallel shaft transmission 2 comprises an auxiliary support fixing foot 202 on a shell, and the auxiliary support fixing foot 202 is fixedly connected with a support arm on a frame of the electric forklift through a bolt; the auxiliary supporting and fixing foot 202 is provided with an electronic heat dissipation water pump 8;
the two-in-one motor controller 3 is a motor controller integrating a driving motor and an oil pump motor;
a control method of a medium-tonnage and large-tonnage electric forklift integrated power system is realized by an upper power control subsystem, and comprises the following steps:
the method comprises the following steps: the upper power system controller 9 receives signals from various human-machine operation systems (such as an accelerator pedal signal, a brake pedal signal, a lifting potentiometer signal, a tilt switch signal, an accessory switch potentiometer signal and other signals) and signals from a BMS battery management system (such as a battery cell signal, a discharge rate, a permitted use condition and other signals);
step two: the upper power system controller 9 is used for processing signals of a man-machine operation system (such as an accelerator pedal signal, a brake pedal signal, a lifting potentiometer signal, an inclination switch signal, an accessory switch potentiometer signal and other signals) and signals of a BMS battery management system (such as signals of a battery monomer, a discharge rate, a use permission condition and the like), comprehensively driving the state requirements of a hydraulic power part (namely man-machine operation system signal input instructions) according to the conditions of various state information, the use permission information and the like of electric quantity of the BMS battery management system signals, distributing power to all subsystems according to the requirements and the quantity, simultaneously carrying out control instructions according to the running and the working state of the vehicle and outputting the control instructions to the two-in-one motor controller 3, and further coordinately controlling the two-in-one motor controller 3;
step three: the driving motor 1 and the oil pump motor 4 are controlled by the two-in-one motor controller 3, so that the driving operation of the electric forklift, the hydraulic steering and various hydraulic transmission executing actions of the electric forklift are realized.
The control process is as follows:
the vehicle driver carries out operation actions on the man-machine operation system, each sensor of the man-machine operation system transmits signals such as an accelerator pedal signal, a brake pedal signal, a lifting potentiometer signal, an inclination switch signal, an accessory switch potentiometer signal and the like to the upper power system controller 9, the BMS battery management system transmits comprehensive analysis data to the upper power system controller 9 through a CAN bus, and the signals comprise single battery signals, discharge multiplying power, allowable use conditions and the like; the upper power system controller 9 comprehensively analyzes the state requirements of the driving sub power system and the hydraulic sub power part according to the signals transmitted by the two, and outputs the control signal of the upper power system controller 9 to the two-in-one motor controller 3 through a CAN bus in combination with the optimal energy consumption and performance characteristics, wherein the vehicle driving control signal is output to a driving motor control unit 301 in the two-in-one motor controller 3 and the hydraulic operation control signal is output to an oil pump motor control unit 302 in the two-in-one motor controller 3, and meanwhile, the driving and hydraulic power units coordinate with each other to distribute power for each subsystem in combination with the requirements of functional safety and use safety; further, a driving motor control unit 301 integrated in the two-in-one motor controller 3 receives a control instruction from the upper power system controller 9, correspondingly controls the driving motor 1 through a three-phase line of the driving motor 1, generates power by the driving motor 1, outputs the power to the front wheels of the vehicle through a parallel shaft speed reducer 2, and drives the vehicle to move; an oil pump motor control unit 302 integrated in the two-in-one motor controller 3 receives a control instruction from an upper power system controller 9, correspondingly controls the oil pump motor 4 through a three-phase line of the oil pump motor 4, the oil pump motor 4 generates power and outputs the power to a first oil pump 6 and a second oil pump 7 through an oil pump motor transmission mechanism 5, the first oil pump 6 and the second oil pump 7 provide high-pressure oil sources and supply the high-pressure oil sources to a vehicle operation mechanism oil cylinder through a vehicle hydraulic oil line, and the operation mechanism oil cylinder generates displacement to complete operation actions required by a vehicle; by integrating the above, the control system can realize the complete control of the vehicle drive and the hydraulic system.
The working principle of the invention is as follows: the driving motor 1, the parallel shaft speed reducer 2, the oil pump motor 4, the oil pump motor transmission mechanism 5, the first oil pump 6, the second oil pump 7, the two-in-one motor controller 3 and the upper power system controller 9 are all integrated into an integral electric forklift power system in a fixed connection mode, the power system of the electric forklift is highly integrated and compact in arrangement, is completely integrated into an integral whole in structure, does not need distributed arrangement, is simple in structure, facilitates the installation of a whole forklift, and greatly improves the integration level and the reliability of the power system; meanwhile, the integrated electric forklift power system greatly reduces or even cancels external cable connection among all parts, reduces the resistance generated by overlong cables while reducing the assembling and installing procedures by reducing the length of the cables, improves the operating efficiency of the power system and prolongs the operation time of the forklift; driving motor 1, oil pump motor 4 and two unification motor controller 3 all cool off through the liquid cooling mode, and the cooling water route is the integrated series connection in integrated driving system, through integrated form liquid cooling system, reduce electric fork truck drive and hydraulic power subsystem's temperature rise by a wide margin, improve integrated driving system's reliability, increase of service life, satisfy more rigorous electric fork truck operation requirement.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. An integrated power system of a medium-tonnage and large-tonnage electric forklift comprises a driving power subsystem, a hydraulic power subsystem and an upper power control subsystem, and is characterized in that the driving power subsystem comprises a driving motor (1), a parallel shaft reducer (2) and a driving motor control unit (301); the output shaft of the driving motor (1) is coaxially connected with the input shaft of the parallel shaft reducer (2) through a spline; the parallel shaft speed reducer (2) comprises a plurality of groups of gear shafts which are arranged in parallel, each pair of paired gear sets on the gear shafts are meshed with each other, and a differential is arranged on the last stage output gear shaft, wherein the plurality of groups of gear shafts are all arranged on a speed reducer shell through bearings; the driving motor control unit (301) is arranged in the two-in-one motor controller (3);
the hydraulic power subsystem comprises an oil pump motor (4), an oil pump motor transmission mechanism (5), a first oil pump (6), a second oil pump (7) and an oil pump motor control unit (302); the oil pump motor (4) is fixedly connected to one side of the shell of the parallel shaft speed reducer (2); the oil pump motor transmission mechanism (5) is fixedly arranged at the output end of the oil pump motor (4); the output shaft of the oil pump motor (4) is coaxially connected with the input shaft of the oil pump motor transmission mechanism (5) through a spline; the input shafts of the first oil pump (6) and the second oil pump (7) are respectively connected with two output shafts of the oil pump motor transmission mechanism (5) through splines; the oil pump motor control unit (302) is arranged inside the two-in-one motor controller (3);
the two-in-one motor controller (3) is fixedly supported on the driving motor (1) and the oil pump motor (4) through a plurality of supporting points;
the upper power control subsystem comprises an upper power system controller (9), and the upper power system controller (9) is fixedly arranged on the two-in-one motor controller (3) and is electrically connected with the two-in-one motor controller (3);
the electric forklift power system is characterized in that the driving motor (1), the parallel shaft speed reducer (2), the oil pump motor (4), the oil pump motor transmission mechanism (5), the first oil pump (6), the second oil pump (7), the two-in-one motor controller (3) and the upper power system controller (9) are integrated into a whole through a fixed connection mode.
2. The integrated power system of the medium-large tonnage electric forklift truck as claimed in claim 1, wherein the oil pump motor transmission mechanism (5) comprises an input shaft (505), a first output shaft (502) and a second output shaft (507), and the input shaft (505), the first output shaft (502) and the second output shaft (507) are all fixedly mounted on the oil pump motor transmission mechanism housing (503) through bearings; an input shaft gear (501) is fixedly connected to an input shaft (505) of the oil pump motor transmission mechanism (5); a first output shaft gear (504) and a second output shaft gear (506) are fixedly connected to a first output shaft (502) and a second output shaft (507) of the oil pump motor transmission mechanism (5) respectively; an input shaft gear (501) of the oil pump motor transmission mechanism (5) is meshed with one corresponding ends of a first output shaft gear (504) and a second output shaft gear (506) at the same time; the number of teeth of a first output shaft gear (504) and a second output shaft gear (506) of the oil pump motor transmission mechanism (5) is more than that of the input shaft gear (501), and simultaneously, the number of teeth of the first output shaft gear (504) and the second output shaft gear (506) is the same or different.
3. The integrated power system of the medium-large tonnage electric forklift truck as claimed in claim 1, wherein the three-phase power line and the low-voltage signal line of the driving motor (1) and the two-in-one motor controller (3) are connected inside the casing of the driving motor (1) and the two-in-one motor controller (3); the three-phase power line and the low-voltage signal line of the oil pump motor (4) and the two-in-one motor controller (3) are connected inside the shell of the oil pump motor (4) and the two-in-one motor controller (3).
4. The integrated power system of the medium-large tonnage electric forklift truck as claimed in claim 1, wherein the first oil pump (6) and the second oil pump (7) are respectively and independently matched, and the first oil pump (6) and the second oil pump (7) are single oil pumps or double pumps.
5. The integrated power system of the medium and large tonnage electric forklift as defined in claim 1, wherein the external electrical connections of the driving power subsystem and the hydraulic power subsystem include a high voltage positive and negative dc connector (303) and a low voltage signal connector (304) disposed on the two-in-one motor controller (3).
6. The integrated power system of the medium-large tonnage electric forklift as claimed in claim 1, wherein the driving motor (1), the oil pump motor (4) and the two-in-one motor controller (3) are all cooled in a liquid cooling mode, and the cooling water path is integrated and connected in series with the inside of the integrated power system.
7. The integrated power system of the medium-large tonnage electric forklift as per claim 1, wherein the parallel shaft transmission (2) comprises an output flange (201) on the shell, and the output flange (201) and a tooth packet flange of the front axle of the electric forklift are fixedly connected into a whole after being positioned by a spigot.
8. The integrated power system of the medium-large tonnage electric forklift truck as claimed in claim 1, wherein the parallel shaft transmission (2) comprises an auxiliary supporting fixed foot (202) on the shell, and the auxiliary supporting fixed foot (202) is fixedly connected with a supporting arm on the frame of the electric forklift truck through a bolt; an electronic heat dissipation water pump (8) is installed on the auxiliary support fixing foot (202).
9. The integrated power system of the medium and large tonnage electric forklift as defined in claim 1, wherein the two-in-one motor controller (3) is a motor controller integrating a driving motor and an oil pump motor.
10. A control method for an integrated power system of a medium-tonnage and large-tonnage electric forklift is characterized by being realized by an upper power control subsystem, and the control method comprises the following steps:
the method comprises the following steps: the upper power system controller (9) receives signals from various human-machine operation systems and signals of a BMS battery management system;
step two: processing signals of a man-machine operation system and signals of a BMS battery management system through an upper power system controller (9), comprehensively driving and distributing power to each subsystem according to the state requirements of a hydraulic power part, according to various state information of the signals of the BMS battery management system, the allowed electric quantity use information and other conditions, according to the needs and quantities, outputting control instructions to a two-in-one motor controller (3) according to the running and working states of a vehicle, and further coordinately controlling the two-in-one motor controller (3);
step three: the driving motor (1) and the oil pump motor (4) are controlled through the two-in-one motor controller (3), so that the driving operation of the electric forklift, the hydraulic steering and the hydraulic transmission execution action of the electric forklift are realized.
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