CN113650491A - Parallel type electro-hydraulic hybrid power system - Google Patents
Parallel type electro-hydraulic hybrid power system Download PDFInfo
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- CN113650491A CN113650491A CN202111044446.0A CN202111044446A CN113650491A CN 113650491 A CN113650491 A CN 113650491A CN 202111044446 A CN202111044446 A CN 202111044446A CN 113650491 A CN113650491 A CN 113650491A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
Abstract
The invention discloses a parallel type electro-hydraulic hybrid power system. The storage battery pack is electrically connected with a motor through a motor controller, an output shaft of the motor is coaxially connected with a first input shaft of a power confluence mechanism, and an output shaft of the power confluence mechanism is coaxially connected with an input shaft of a main speed reducer; the oil inlet and outlet of the hydraulic accumulator is communicated with the high-pressure oil inlet and outlet of the hydraulic pump motor, the low-pressure oil inlet and outlet of the hydraulic pump motor is communicated with the hydraulic oil tank, and the output shaft of the hydraulic pump motor is coaxially connected with the second input shaft of the power confluence mechanism. The invention combines the electric drive system with high energy density and the hydraulic drive system with high power density together to form an electro-hydraulic hybrid power system, the electric drive system provides average power, the hydraulic drive system provides peak power, the installed power of the motor is reduced, the negative influence of large-current charging and discharging on the storage battery is avoided, and the power performance of the engineering machinery is improved.
Description
Technical Field
The invention relates to an electro-hydraulic hybrid power system, in particular to a parallel electro-hydraulic hybrid power system.
Background
The technology for reducing the use of fossil fuels and developing new energy is a main technical approach for realizing carbon peak reaching and carbon neutralization strategies in China. Construction machines are also being driven electrically as one of the main emission sources in non-road traffic. The pure electric engineering machinery has obvious advantages in the aspects of energy conversion efficiency, emission, noise and the like compared with the engineering machinery driven by the traditional diesel engine, but is limited by low electric driving power density in the aspect of power performance. The hydrostatic transmission has the advantages of high power density, simple structure, convenient arrangement and the like, and is widely applied to engineering machinery. On the electric engineering machinery, in order to meet the requirement of peak power, the motor needs to be configured according to the peak power, so that the motor runs in a relatively low-power area most of the time, and the problems of low equipment utilization rate, low efficiency area of running working points and the like are caused. In addition, under the working conditions of peak power generation such as rapid acceleration, the instantaneous large current of the motor has great negative effects on the real-time capacity, the charge-discharge service life and the like of the storage battery.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides a parallel type electro-hydraulic hybrid power system, which combines an electric drive system with high energy density and a hydraulic drive system with high power density together to form the electro-hydraulic hybrid power system, so that the respective advantages are fully exerted, the electric drive system provides average power, and the hydraulic drive system provides peak power, so that the system has higher energy conversion efficiency, stronger power performance and improved comprehensive performance of engineering machinery.
The technical scheme adopted by the invention is as follows:
the invention comprises a storage battery pack, a motor controller, a motor, a power confluence mechanism, a main speed reducer, a hydraulic pump motor, a hydraulic accumulator and a hydraulic oil tank;
the storage battery pack is electrically connected with the motor through the motor controller, the power confluence mechanism is provided with two input shafts and an output shaft, the output shaft of the motor is coaxially connected with the first input shaft of the power confluence mechanism, and the output shaft of the power confluence mechanism is coaxially connected with the input shaft of the main speed reducer; the oil inlet and outlet of the hydraulic accumulator is communicated with the high-pressure oil inlet and outlet of the hydraulic pump motor, the low-pressure oil inlet and outlet of the hydraulic pump motor is communicated with the hydraulic oil tank, and the output shaft of the hydraulic pump motor is coaxially connected with the second input shaft of the power confluence mechanism.
The hybrid power system mainly comprises an electric drive system and a hydraulic drive system, wherein the electric drive system of the hybrid power system is formed by the storage battery pack, the motor controller, the motor and the power confluence mechanism, and the electric drive system provides the average power of the hybrid power system; and the hydraulic pump motor, the hydraulic accumulator and the hydraulic oil tank form a hydraulic driving system of the hybrid power system, and the hydraulic driving system provides peak power of the hybrid power system.
The hydraulic pump motor is a variable displacement hydraulic pump motor.
The hydraulic pump motor is a single hydraulic pump motor, or a combination of two or more hydraulic pump motors.
The storage battery pack is one of a chemical battery, a fuel cell or a super capacitor, or a combination of more than two of the chemical battery, the fuel cell or the super capacitor.
The motor is a permanent magnet synchronous motor, an asynchronous motor, a switched reluctance motor or a direct current motor.
The hydraulic accumulator is a combination of more than two hydraulic accumulators or a single hydraulic accumulator.
The motor and the first input shaft of the power confluence mechanism are directly and coaxially connected, or are coaxially connected through a clutch or a gearbox.
And the output shaft of the hydraulic pump motor is directly and coaxially connected with the second input shaft of the power confluence mechanism or is coaxially connected through a clutch.
The power converging mechanism is a meshing gear pair or a planetary gear set.
The hydraulic accumulator provides high-power charge and discharge in a short time, the motor provides long-time average power, and the power of the hydraulic accumulator and the power of the motor are coupled together through the power confluence mechanism. High-pressure hydraulic oil in the hydraulic accumulator is converted into mechanical energy through a hydraulic pump motor, and the mechanical energy is coupled with mechanical energy of a motor through a power confluence mechanism to jointly drive a main speed reducer and wheels. Because the high-pressure hydraulic accumulator is added as an auxiliary power source, under the condition of high-power requirements such as rapid acceleration and the like, the high-pressure hydraulic accumulator with high power density is utilized to provide high-power assistance in a short time, the power performance of engineering machinery is improved, the power burden of a motor is reduced, and the impact of large current on a storage battery is avoided; under the condition of constant speed, the power requirement is not large, and the required energy is provided by a motor which runs at the power close to the rated power; under the condition of deceleration, all or part of braking energy can be recovered and converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic energy accumulator, so that the phenomenon that the storage battery is impacted and generates heat due to large current generated during braking through the motor is avoided.
The invention has the beneficial effects that:
the high-energy-density electric drive system and the high-power-density hydraulic drive system are combined to form an electro-hydraulic hybrid power system, the electric drive system provides average power, and the hydraulic drive system provides peak power. The motor is selected according to the average power, so that the installed power of the motor is reduced, the volume and the weight of the motor are reduced, and the problems that the utilization rate of motor equipment is low, the operating working point is often in a low-efficiency area and the like are solved; in addition, the problem that under the working conditions of rapid acceleration and the like, the instantaneous large current of the motor has great negative influence on the real-time capacity and the charge-discharge service life of the storage battery is solved; due to the high-power characteristic of hydraulic drive, better acceleration power performance than pure electric drive can be obtained under the working conditions of starting acceleration and the like. The system has high energy conversion efficiency and high power performance, and the comprehensive performance of the engineering machinery is improved.
Drawings
FIG. 1 is a schematic diagram of a parallel electro-hydraulic hybrid system.
Figure 2 is a schematic diagram of the system of the present invention for wheel drive of a wheel loader.
Fig. 3 is a schematic diagram of the system of the present invention for wheel drive of an electric mining truck.
Fig. 4 is a schematic diagram of the system for excavator swing drive of the present invention.
Fig. 5 is a system schematic diagram of an embodiment of the invention for an electric fork-lift truck travel drive.
Fig. 6 is a system schematic diagram of another embodiment of the invention for an electric fork-lift truck travel drive.
In the figure: 1. the device comprises a storage battery pack, 2, a motor controller, 3, a motor, 4, a power converging mechanism, 5, a main reducer, 6, a hydraulic pump motor, 7, a hydraulic accumulator, 8, a hydraulic oil tank, 9, wheels, 10, a clutch, 11, a gearbox, 12 and a slewing mechanism.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, the present invention includes a battery pack 1, a motor controller 2, a motor 3, a power confluence mechanism 4, a main reducer 5, a hydraulic pump motor 6, a hydraulic accumulator 7 and a hydraulic oil tank 8;
the storage battery pack 1 is electrically connected with a motor 3 through a motor controller 2, the power confluence mechanism 4 is provided with two input shafts and an output shaft, the output shaft of the motor 3 is coaxially connected with a first input shaft of the power confluence mechanism 4, and the output shaft of the power confluence mechanism 4 is coaxially connected with an input shaft of a main speed reducer 5; an oil inlet and an oil outlet of the hydraulic accumulator 7 are communicated with a high-pressure oil inlet and an oil outlet of the hydraulic pump motor 6, a low-pressure oil inlet and an oil outlet of the hydraulic pump motor 6 are communicated with a hydraulic oil tank 8, and an output shaft of the hydraulic pump motor 6 is coaxially connected with a second input shaft of the power confluence mechanism 4.
The hybrid power system mainly comprises an electric drive system and a hydraulic drive system, wherein the electric drive system of the hybrid power system is formed by a storage battery pack 1, a motor controller 2, a motor 3 and a power confluence mechanism 4, and the electric drive system provides the average power of the hybrid power system; the hydraulic pump motor 6, the hydraulic accumulator 7 and the hydraulic oil tank 8 form a hydraulic driving system of the hybrid power system, and the hydraulic driving system provides peak power of the hybrid power system.
The hydraulic pump motor 6 is a variable displacement hydraulic pump motor.
The hydraulic pump motor 6 is a single hydraulic pump motor, or a combination of two or more hydraulic pump motors.
The battery pack 1 is one of a chemical battery, a fuel cell, or a super capacitor, or a combination of two or more thereof.
The motor 3 is a permanent magnet synchronous motor, an asynchronous motor, a switched reluctance motor or a direct current motor.
The hydraulic accumulator 7 is a combination of two or more hydraulic accumulators or a single hydraulic accumulator.
The electric machine 3 and the power combiner 4 are coaxially connected directly or via a clutch or a gearbox.
The power combining mechanism 4 is a meshing gear pair or a planetary gear set.
The high-energy-density electric drive system and the high-power-density hydraulic drive system are combined to form an electro-hydraulic hybrid power system, the electric drive system provides average power, and the hydraulic drive system provides peak power. When the rated power of the motor is selected, the peak power and the average power in a working condition period are estimated according to the working condition applicable to the engineering machinery, and the motor is selected to be slightly higher than the average power and far lower than the peak power. During operation, the pressure range of the high-pressure hydraulic accumulator is planned through an energy management strategy, on one hand, the motor can work in a high-efficiency area for a long time, on the other hand, the energy stored by the accumulator is enough under the working conditions of acceleration and the like needing hydraulic auxiliary power, the stored energy is less during deceleration, and enough free capacity is provided for recovering braking energy.
The embodiment of the invention and the implementation working process thereof are as follows:
example 1
Fig. 2 is a schematic diagram of the system for a wheel loader travel drive of the present invention. The hydraulic pump motor 6 and the electric machine 3 are directly connected to the power combining mechanism 4. The power combining mechanism 4 is a meshing gear pair.
The wheel loader is widely applied to wheel drive of the wheel loader, the motor 3 is directly and coaxially connected with a first input shaft of the power converging mechanism 4, the hydraulic pump motor 6 is directly and coaxially connected with a second input shaft of the power converging mechanism 4, and an output shaft of the main speed reducer 5 is coaxially connected with wheels 9 of the wheel loader. The wheel loader has larger inertia, so that the torque is larger during acceleration and deceleration, and the high-power-density hydraulic accumulator can be charged and discharged through energy, and under the condition of large torque requirements such as rapid acceleration and the like, the hydraulic motor provides large torque, so that the power performance of engineering machinery is improved, the power burden of the motor is reduced, and the impact of large current on the storage battery is avoided; under the condition of constant speed, the power requirement is not large, and the required energy is provided by a motor which runs at the power close to the rated power; under the condition of deceleration, all or part of braking energy can be recovered and converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic energy accumulator, so that the phenomenon that the storage battery is impacted and generates heat due to large current generated during braking through the motor is avoided.
The specific working process of the system is as follows: when braking is carried out, the displacement of the hydraulic pump motor 6 is adjusted to be a negative displacement pump working state through electronic proportional control, the hydraulic pump motor 6 generates braking torque, the braking torque is controlled through the displacement of the hydraulic pump motor 6, and meanwhile, oil flows into the hydraulic energy accumulator 7 after being boosted through the hydraulic pump motor 6 from the hydraulic oil tank 8; the motor 3 provides partial braking torque or no braking torque, and the braking energy is partially or completely converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic accumulator 7. When the motor 3 is accelerated, the motor works under the condition of larger power which is not more than the rated power and is lower than the load power, partial driving torque is provided, the displacement of the hydraulic pump motor 6 is positive, the displacement is controlled through electronic proportion control, the output torque of the hydraulic pump motor 6 is further controlled, meanwhile, high-pressure oil stored in the hydraulic accumulator 7 flows into and drives the hydraulic pump motor 6 to rotate, driving torque required by acceleration is provided, and the hydraulic oil flows into the hydraulic oil tank 8 after the pressure of the hydraulic oil is reduced. When the vehicle runs at a constant speed, the power demand is stable, the pressure of the hydraulic energy accumulator 7 is basically kept unchanged, the displacement of the hydraulic pump motor 6 is adjusted to be zero through electronic proportion, and the output torque of the hydraulic pump motor 6 is zero. The motor 3 mainly provides power, and the speed of the vehicle is controlled by the motor controller 2.
Example 2
Fig. 3 is a schematic diagram of the system of the present invention when used in a wheel drive for an electric mining truck. The motor 3 is coaxially connected with a first input shaft of the power converging mechanism 4 through a gearbox 11, the hydraulic pump motor 6 is coaxially connected with a second input shaft of the power converging mechanism 4 through a clutch 10, an output shaft of the main speed reducer 5 is coaxially connected with wheels 9 of the electric mining truck, and the power converging mechanism 4 is a meshing gear pair.
. Because the loading weight of the mining truck is larger, the torque is larger during acceleration and deceleration, under the working conditions of acceleration or long-distance uphill and the like, the hydraulic accumulator provides auxiliary power, and the motor works below rated power, so that the problem that the instantaneous large current of the motor has large negative influence on the real-time capacity and the charging and discharging service life of the storage battery is avoided; on the other hand, due to the high-power characteristic of hydraulic driving, better acceleration power performance than pure electric driving is obtained under the working conditions of starting acceleration and the like. When the brake is used for braking or going downhill, the hydraulic system provides brake torque, so that the phenomenon that the motor generates a large amount of heat and has negative influence on the service life of elements such as the motor and a storage battery when the motor works under the condition of large torque and large current for a long time can be avoided.
The specific working process of the system is as follows: when braking is carried out, the clutch 10 is closed, the displacement of the hydraulic pump motor 6 is adjusted to be in a negative displacement pump working state through electronic proportional control, the hydraulic pump motor 6 generates braking torque, the magnitude of the braking torque is controlled through the displacement of the hydraulic pump motor 6, and meanwhile, oil flows into the hydraulic accumulator 7 after being boosted through the hydraulic pump motor 6 from the hydraulic oil tank 8; the motor 3 provides partial braking torque or no braking torque, and the braking energy is partially or completely converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic accumulator 7. When accelerating, the clutch 10 is closed, the electric machine 3 works under the larger power which is not more than the rated power and is lower than the load power, partial driving torque is provided, the displacement of the hydraulic pump motor 6 is positive, the displacement is controlled by electronic proportion, the output torque of the hydraulic pump motor 6 is further controlled, meanwhile, high-pressure oil stored in the hydraulic accumulator 7 flows into and drives the hydraulic pump motor 6 to rotate, driving torque required by accelerating is provided, and the hydraulic oil flows into the hydraulic oil tank 8 after the pressure of the hydraulic oil is reduced. When the vehicle runs at a constant speed, the power demand is stable, the pressure of the hydraulic accumulator 7 is basically kept unchanged, the clutch 10 is disconnected, the displacement of the hydraulic pump motor 6 is adjusted to be zero through electronic proportion, and the output torque of the hydraulic pump motor 6 is zero. The motor 3 mainly provides power, the gearbox 11 selects a gear ratio according to the required vehicle speed, and the vehicle speed is controlled through the motor controller 2.
Example 3
Fig. 4 is a schematic diagram of the system of the present invention for use in a swing drive of an excavator. The motor 3 is directly and coaxially connected with a first input shaft of the power converging mechanism 4, the hydraulic pump motor 6 is directly and coaxially connected with a second input shaft of the power converging mechanism 4, an output shaft of the main speed reducer 5 is coaxially connected with a rotating mechanism 12 of the excavator, and the power converging mechanism 4 is a meshing gear pair. The excavator needs to accelerate and decelerate and brake continuously in the process of turning the upper body, and the upper body has large mass, so that the excavator is required to have large starting torque and braking torque. The typical working condition of the rotary motion is acceleration-deceleration, and when the rotary motion is decelerated, all or part of braking energy can be recovered and converted into high-pressure hydraulic oil to be stored in a high-pressure hydraulic energy accumulator, so that the impact and the heating of a storage battery caused by large braking current of a motor are avoided; when the vehicle is accelerated, the hydraulic energy accumulator utilizes the recovered braking energy and provides large torque through the hydraulic motor, so that the energy utilization rate and the power performance are improved.
The specific working process of the system is as follows: when braking is carried out, the displacement of the hydraulic pump motor 6 is adjusted to be a negative displacement pump working state through electronic proportional control, the hydraulic pump motor 6 generates braking torque, the braking torque is controlled through the displacement of the hydraulic pump motor 6, and meanwhile, oil flows into the hydraulic energy accumulator 7 after being boosted through the hydraulic pump motor 6 from the hydraulic oil tank 8; the motor 3 provides partial braking torque or no braking torque, and the braking energy is partially or completely converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic accumulator 7. When the motor 3 is accelerated, the motor works under the condition of larger power which is not more than the rated power and is lower than the load power, partial driving torque is provided, the displacement of the hydraulic pump motor 6 is positive, the displacement is controlled through electronic proportion control, the output torque of the hydraulic pump motor 6 is further controlled, meanwhile, high-pressure oil stored in the hydraulic accumulator 7 flows into and drives the hydraulic pump motor 6 to rotate, driving torque required by acceleration is provided, and the hydraulic oil flows into the hydraulic oil tank 8 after the pressure of the hydraulic oil is reduced.
Example 4
Fig. 5 is a schematic diagram of the system for the electric forklift walking drive of the invention. The motor 3 is coaxially connected with a first input shaft of the power converging mechanism 4 through a clutch 10, the hydraulic pump motor 6 is directly and coaxially connected with a second input shaft of the power converging mechanism 4, and an output shaft of the main speed reducer 5 is coaxially connected with wheels 9 of the electric forklift. The forklift is widely applied engineering machinery, and the electric forklift has certain advantages in indoor and port application.
The specific working process of the system is as follows: when braking is carried out, the clutch 10 is disconnected, the displacement of the hydraulic pump motor 6 is adjusted to be in a negative displacement pump working state through electronic proportional control, the hydraulic pump motor 6 generates braking torque, the magnitude of the braking torque is controlled through the displacement of the hydraulic pump motor 6, and meanwhile, oil flows into the hydraulic accumulator 7 after being boosted through the hydraulic pump motor 6 from the hydraulic oil tank 8; the motor 3 does not provide braking torque, and the braking energy is partially or completely converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic accumulator 7. When acceleration is carried out, the clutch 10 is engaged, the motor 3 works under the larger power which is not more than the rated power and is lower than the load power, partial driving torque is provided, the displacement of the hydraulic pump motor 6 is positive, the displacement is controlled through electronic proportion control, the output torque of the hydraulic pump motor 6 is further controlled, meanwhile, high-pressure oil stored in the hydraulic accumulator 7 flows into and drives the hydraulic pump motor 6 to rotate, driving torque required by acceleration is provided, and the hydraulic oil flows into the hydraulic oil tank 8 after the pressure of the hydraulic oil is reduced. When the vehicle runs at a constant speed, the power demand is stable, the clutch 10 is engaged, the pressure of the hydraulic accumulator 7 is basically kept unchanged, the displacement of the hydraulic pump motor 6 is adjusted to be zero through electronic proportion, and the output torque of the hydraulic pump motor 6 is zero. The motor 3 mainly provides power, and the speed of the vehicle is controlled by the motor controller 2.
Example 5
Fig. 6 is a system schematic diagram of another embodiment of the invention for an electric fork-lift truck travel drive. The motor 3 is directly and coaxially connected with a first input shaft of the power converging mechanism 4, the hydraulic pump motor 6 is directly and coaxially connected with a second input shaft of the power converging mechanism 4, an output shaft of the main speed reducer 5 is coaxially connected with wheels 9 of the electric forklift, and the power converging mechanism 4 is a planetary gear set. The forklift is widely applied engineering machinery, and the electric forklift has certain advantages in indoor and port application.
The specific working process of the system is as follows: when braking is carried out, the displacement of the hydraulic pump motor 6 is adjusted to be a negative displacement pump working state through electronic proportional control, the hydraulic pump motor 6 generates braking torque, the braking torque and the rotating speed are controlled through the displacement of the hydraulic pump motor 6, and meanwhile, oil flows into the hydraulic energy accumulator 7 after being boosted through the hydraulic pump motor 6 from the hydraulic oil tank 8; the motor 3 provides partial braking power or does not provide the braking power, and the braking energy is partially or completely converted into high-pressure hydraulic oil to be stored in the high-pressure hydraulic accumulator 7. When the motor 3 is accelerated, the motor works under a larger power which is not more than the rated power and is lower than the load power, partial driving power is provided, the displacement of the hydraulic pump motor 6 is positive, the displacement is controlled through electronic proportion control, the output torque and the rotating speed of the hydraulic pump motor 6 are further controlled, meanwhile, high-pressure oil stored in the hydraulic accumulator 7 flows into and drives the hydraulic pump motor 6 to rotate, driving power required by acceleration is provided, and the hydraulic oil flows into the hydraulic oil tank 8 after the pressure of the hydraulic oil is reduced. When the vehicle runs at a constant speed, the power demand is stable, the pressure of the hydraulic accumulator 7 is basically kept unchanged, the discharge capacity of the hydraulic pump motor 6 is adjusted through electronic proportion, the rotating speed of the hydraulic pump motor 6 is controlled to be zero, and the input and output flow of the hydraulic accumulator is controlled to be zero. The motor 3 mainly provides power, and the speed of the vehicle is controlled by the motor controller 2.
Claims (10)
1. A parallel type electro-hydraulic hybrid power system is characterized in that: the device comprises a storage battery pack (1), a motor controller (2), a motor (3), a power confluence mechanism (4), a main speed reducer (5), a hydraulic pump motor (6), a hydraulic energy accumulator (7) and a hydraulic oil tank (8);
the storage battery pack (1) is electrically connected with the motor (3) through the motor controller (2), an output shaft of the motor (3) is coaxially connected with a first input shaft of the power confluence mechanism (4), and an output shaft of the power confluence mechanism (4) is coaxially connected with an input shaft of the main speed reducer (5); an oil inlet and outlet of the hydraulic accumulator (7) is communicated with a high-pressure oil inlet and outlet of the hydraulic pump motor (6), a low-pressure oil inlet and outlet of the hydraulic pump motor (6) is communicated with the hydraulic oil tank (8), and an output shaft of the hydraulic pump motor (6) is coaxially connected with a second input shaft of the power confluence mechanism (4).
2. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the hybrid power system mainly comprises an electric drive system and a hydraulic drive system, wherein the electric drive system of the hybrid power system is formed by the storage battery pack (1), the motor controller (2), the motor (3) and the power confluence mechanism (4), and the electric drive system provides the average power of the hybrid power system; and the hydraulic pump motor (6), the hydraulic accumulator (7) and the hydraulic oil tank (8) form a hydraulic driving system of the hybrid power system, and the hydraulic driving system provides peak power of the hybrid power system.
3. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the hydraulic pump motor (6) is a variable displacement hydraulic pump motor.
4. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the hydraulic pump motor (6) is a single hydraulic pump motor or a combination of two or more hydraulic pump motors.
5. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the storage battery pack (1) is one of a chemical battery, a fuel cell or a super capacitor, or a combination of more than two of the chemical battery, the fuel cell or the super capacitor.
6. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the motor (3) is a permanent magnet synchronous motor, an asynchronous motor, a switched reluctance motor or a direct current motor.
7. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the hydraulic accumulator (7) is a combination of more than two hydraulic accumulators or a single hydraulic accumulator.
8. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the motor (3) and the first input shaft of the power confluence mechanism (4) are directly and coaxially connected or are coaxially connected through a clutch or a gearbox.
9. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the output shaft of the hydraulic pump motor (6) is directly and coaxially connected with the second input shaft of the power confluence mechanism (4) or is coaxially connected through a clutch.
10. A parallel electro-hydraulic hybrid system according to claim 1, characterized in that: the power converging mechanism (4) is a meshing gear pair or a planetary gear set.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201816448U (en) * | 2010-07-16 | 2011-05-04 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Tandem hydraulic-electric hybrid vehicle driving device |
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