KR102046182B1 - Energy regenerating construction equipment and energy regenerating method thereof - Google Patents

Energy regenerating construction equipment and energy regenerating method thereof Download PDF

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Publication number
KR102046182B1
KR102046182B1 KR1020130038626A KR20130038626A KR102046182B1 KR 102046182 B1 KR102046182 B1 KR 102046182B1 KR 1020130038626 A KR1020130038626 A KR 1020130038626A KR 20130038626 A KR20130038626 A KR 20130038626A KR 102046182 B1 KR102046182 B1 KR 102046182B1
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KR
South Korea
Prior art keywords
accumulator
construction equipment
hydraulic
oil
hydraulic pump
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KR1020130038626A
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Korean (ko)
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KR20140122339A (en
Inventor
주춘식
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두산인프라코어 주식회사
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Priority to KR1020130038626A priority Critical patent/KR102046182B1/en
Publication of KR20140122339A publication Critical patent/KR20140122339A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The present invention relates to energy recovery construction equipment. Energy recovery construction equipment according to the present invention, the brake pedal for generating a brake signal in response to the operator's operation; A driving unit for driving the wheels to enable driving of the construction equipment; An oil reservoir for storing oil; A hydraulic pump motor driven by receiving power from the driving unit; An accumulator in which oil supplied from the hydraulic pump motor is accumulated; And a controller configured to control the hydraulic pump motor to accumulate the oil in the accumulator when the brake signal is generated.
Therefore, according to the present invention, the fuel consumption can be reduced while having the same work performance as the conventional construction equipment.

Description

Energy recovery construction equipment and its energy recovery method {ENERGY REGENERATING CONSTRUCTION EQUIPMENT AND ENERGY REGENERATING METHOD THEREOF}

The present invention relates to an energy recovery construction equipment, and more particularly, in a construction equipment having both a traveling function and a work function, a construction capable of recovering kinetic energy at the time of deceleration during driving and potential energy of the work machine at the time of working as hydraulic energy It's about equipment.

In general, construction equipment refers to a variety of mechanical devices used in construction, and to operate such construction equipment, various fuels such as diesel, electricity and the like are used.

In construction equipment such as wheel loaders that simultaneously run and work, the kinetic energy of construction equipment is discarded by friction when decelerating, and during operation, the potential energy of construction equipment is lost by throwing pressure oil into the tank. In addition, it is required to reduce the fuel consumption of construction equipment to solve these problems.

The present invention is to solve the above-mentioned problems, an object of the present invention is to provide an energy recovery construction equipment in which the amount of fuel is reduced by adding the driving kinetic energy and hydraulic energy recovery function of the construction equipment to the construction equipment.

Energy recovery construction equipment according to an embodiment of the present invention for achieving the above object is a brake pedal for generating a brake signal in response to the operator's operation; A driving unit for driving the wheels to enable driving of the construction equipment; An oil reservoir for storing oil; A hydraulic pump motor driven by receiving power from the driving unit; An accumulator in which oil supplied from the hydraulic pump motor is accumulated; And a controller configured to control the hydraulic pump motor to accumulate the oil in the accumulator when the brake signal is generated.

The driving unit includes a transmission connected to the wheels, the hydraulic pump motor is connected to the transmission to receive power when driving or decelerating the construction equipment, and the control unit is the hydraulic pump motor when deceleration of the construction equipment The power is supplied from the transmission and controlled to be driven by a pump that accumulates the accumulator, and when the construction equipment is accelerated, the hydraulic pump motor is driven by a motor by oil accumulated in the accumulator to power the transmission. It can be controlled to provide.

And a hydraulic control valve for controlling the flow of the oil between the hydraulic pump motor and the accumulator, wherein the control unit controls the hydraulic control valve at the time of deceleration or acceleration of the construction equipment to accumulate the accumulator. Or the hydraulic oil of the accumulator may be provided to the hydraulic pump motor.

And a hydraulic actuator for operating the construction equipment, a hydraulic pump for supplying oil to the hydraulic actuator, and a hydraulic control valve for controlling oil supplied from the hydraulic pump to the hydraulic actuator. The control valve controls the connection between the accumulator and the hydraulic actuator, and the control unit controls the accumulating oil discharged from the hydraulic actuator by the operation of the construction equipment to accumulate on the accumulator or accumulate on the accumulator. The hydraulic control valve may be controlled to supply oil to the hydraulic actuator.

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Energy recovery method of construction equipment according to another embodiment of the present invention for achieving the above object is the step of converting the input of the brake pedal of the construction equipment into an electrical signal (S10); Checking a current equipment driving speed (S20) and setting a braking completion target time based on a brake pedal input electric signal value (S30); Calculating a target deceleration by the set braking completion target time and the measured current equipment traveling speed (S40); Measuring the pressure of the accumulator (S50); And when the accumulator is capable of accumulating pressure as a result of the pressure measurement of the accumulator, recovering the kinetic energy of the vehicle as the hydraulic energy of the accumulator and decelerating the vehicle (S60).

In addition, when the accumulator is unable to accumulate as a result of pressure measurement of the accumulator, or when the target deceleration is not satisfied in the step S60 of recovering the kinetic energy as hydraulic energy (S60), the accumulator controls the braking device simultaneously with the accumulator pressure. By generating a friction braking torque together to perform the desired construction equipment braking step (S70); may further include.

According to the present invention, the fuel consumption can be reduced while having the same work performance as the conventional construction equipment.

1 is a structural diagram of an energy recovery construction equipment according to an embodiment of the present invention.
2 is a diagram showing the operation and energy recovery of the accumulator in the case of traveling and working of the energy recovery construction equipment according to an embodiment of the present invention.
3 is a flowchart illustrating an operation in a braking situation of the energy recovery construction equipment according to an embodiment of the present invention.

The present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

1 is a structural diagram of an energy recovery construction equipment according to an embodiment of the present invention, Figure 2 is a diagram showing the operation and energy recovery of the accumulator when running and working the energy recovery construction equipment according to an embodiment of the present invention.

1 and 2, the energy recovery construction apparatus 1 according to the embodiment of the present invention includes a control unit 10, a hydraulic control valve 20, a hydraulic pump motor 30, and an accumulator 40. And an oil reservoir 50, an engine 60, a hydraulic pump 70, and a transmission 80.

The control unit 10 includes an accelerator pedal 11, a brake pedal 12, a shift lever 13, a boom joystick 14, a bucket joystick ( 15). The controller 10 controls the user from the accelerator pedal 11, the brake pedal 12, the shift lever 13, the boom joystick 14, and the bucket joystick 15. In response to the signal, the operating speed of the construction equipment 1, the pressure of the accumulator 40, and the like to monitor the function to perform the system control appropriately.

The hydraulic control valve 20 may adjust the oil pressure, flow rate and flow direction of oil, ie, pressurized oil, which flows into or out of a hydraulic actuator provided in a work device such as the boom 21 and the bucket 22. In addition, the hydraulic control valve 20 is connected to the hydraulic pump motor 30, the accumulator 40, the oil storage unit 50 and the hydraulic pump 70, the hydraulic pump motor 30, the accumulator 40 and oil storage The oil flowing into or out of the part 50 and the hydraulic pump 70, that is, the hydraulic pressure of the pressure oil may be adjusted.

The hydraulic pump motor 30 is connected to the transmission 80 and acts as a hydraulic pump or hydraulic motor. When the hydraulic pump motor 30 acts as a hydraulic pump, the mechanical energy supplied from the outside is converted into pressure energy of the pressurized oil. When the hydraulic pump motor 30 acts as a hydraulic motor, the hydraulic energy is converted into mechanical energy. Generate rotational movement.

The accumulator 40 is connected to a hydraulic actuator provided in the oil storage unit 50, the hydraulic pump 70, the hydraulic pump motor 30, the boom 21, and the bucket 22 through the hydraulic control valve 20. . The accumulator 40 may receive the high pressure oil from the hydraulic pump 70 or the hydraulic pump motor 30 to accumulate and store the high pressure oil.

When the construction equipment 1 is traveling decelerating, the accumulator 40 may recover energy when the accumulator is capable of accumulating pressure. The hydraulic pump motor 30 is controlled to operate as a pump for the recovery of energy in the case of the deceleration of the construction equipment 1, the accumulator 40 in the oil storage unit 50 using the compressed energy of the pressure oil generated at this time Oil accumulates to the side. If it is impossible to accumulate the accumulator 40, friction braking is performed to decelerate the construction equipment 1.

In addition, when the boom 21 is down or the bucket 22 is dumped, that is, when the hydraulic actuators provided in the boom 21 and the bucket 22 are compressed, the high pressure oil of the hydraulic actuator The hydraulic control valve 20 may be controlled to recover the energy by accumulating the accumulator 40. When the accumulator 40 is unable to accumulate pressure, the high pressure oil may be discharged to the oil storage unit 50 so that the down operation of the boom 21 and the dumping operation of the bucket 22 may be performed.

When the construction equipment 1 accelerates, the oil accumulated in the accumulator 40 controls the hydraulic pump motor 30 to operate as a motor to help the construction equipment 1 to accelerate. In addition, when the boom 21 is up or the bucket 22 is crawled, that is, when the hydraulic actuators provided in the boom 21 and the bucket 22 extend, the accumulator 40 To control the hydraulic control valve 20 so that the high-pressure oil stored in the hydraulic actuator to operate the boom 21 and the bucket 22 to help the load operation. When the accumulator 40 runs out of energy accumulated in the accumulator 40, the wheels are driven from the engine 60 to the transmission 80 in the case of an accelerated driving, and the load operation during the operation is performed from the engine 60 to the hydraulic pump 70. The high pressure oil discharged from the hydraulic pump 70 raises or extends the hydraulic actuators provided in the boom 21 and the bucket 22.

3 is a flowchart illustrating an operation in a braking situation of the energy recovery construction equipment according to an embodiment of the present invention.

Referring to FIG. 3, first, when the operator presses the brake pedal 12, the controller 10 converts the input degree as an electric signal (S10).

Then, the current equipment traveling speed is checked (S20), and the braking completion target time is set by the brake pedal input electric signal value (S30).

Next, the target deceleration is calculated based on the set braking completion target time and the measured current equipment traveling speed (S40).

When the pressure of the accumulator 40 is measured (S50), and when the pressure can be accumulated, the hydraulic control valve 20 and the hydraulic pump motor 30 are controlled so that the kinetic energy of the vehicle is recovered as the hydraulic energy of the accumulator 40 and the vehicle. This deceleration (S60). The deceleration control of the construction equipment 1 controls the hydraulic control valve 20 and the hydraulic pump motor 30 to satisfy the target deceleration of the construction equipment 1 determined by the operation.

In this case, when the deceleration torque due to the accumulator 40 is not sufficient and the target deceleration is not satisfied, the hydraulic braking device is controlled simultaneously with the accumulator pressure of the accumulator 40 to generate the friction braking torque. Allow braking (S70).

On the other hand, when the pressure of the accumulator 40 is no longer possible to accumulate pressure, it is impossible to recover driving energy. To satisfy the target deceleration of.

According to the present invention, the fuel consumption can be reduced while having the same work performance as the conventional construction equipment.

1: energy recovery construction equipment 10: control unit
20: hydraulic control valve 30: hydraulic pump motor
40: accumulator 50: oil reservoir
60: engine 70: hydraulic pump
80: transmission

Claims (10)

A brake pedal generating a brake signal in response to an operator's operation;
A driving unit for driving the wheels to enable driving of the construction equipment;
An oil reservoir for storing oil;
A hydraulic pump motor driven by receiving power from the driving unit;
An accumulator in which oil supplied from the hydraulic pump motor is accumulated;
A controller configured to control the hydraulic pump motor to accumulate oil in the accumulator when the brake signal is generated; And
A braking device for friction braking to slow down the construction equipment,
When the accumulator is capable of accumulating pressure as a result of the pressure measurement of the accumulator, the vehicle is decelerated by recovering the kinetic energy of the vehicle as the hydraulic energy of the accumulator,
And when the accumulator is unable to accumulate as a result of pressure measurement of the accumulator, generating the friction braking torque by controlling the braking device to brake the construction equipment.
The method of claim 1,
The driving unit includes a transmission connected to the wheel,
The hydraulic pump motor is connected to the transmission to receive power when driving or decelerating the construction equipment,
The control unit controls the hydraulic pump motor to be driven by a pump for receiving the power from the transmission to accumulate the accumulator when the construction equipment is decelerated, and the hydraulic pump motor is accumulated in the accumulator when the construction equipment is accelerated. Energy-driven construction equipment characterized in that it is driven by a motor to control to provide power to the transmission.
The method of claim 1,
Further comprising a hydraulic control valve for controlling the flow of the oil between the hydraulic pump motor and the accumulator,
The control unit controls the hydraulic control valve when decelerating or accelerating the construction equipment to accumulate the accumulator or to provide the hydraulic pressure of the accumulator to the hydraulic pump motor.
The method according to any one of claims 1 to 3,
A hydraulic actuator for the work of the construction equipment, and a hydraulic pump for supplying oil to the oil storage unit to the hydraulic actuator and a hydraulic control valve for controlling the oil supplied from the hydraulic pump to the hydraulic actuator,
The hydraulic control valve controls the connection of the accumulator and the hydraulic actuator,
The control unit controls the hydraulic control valve so that the pressure oil discharged from the hydraulic actuator by the operation of the construction equipment is accumulated in the accumulator or the pressure oil accumulated in the accumulator is supplied to the hydraulic actuator. equipment.
In the energy recovery method of construction equipment,
Converting the input degree of the brake pedal of the construction equipment into an electrical signal (S10);
Measuring the pressure of the accumulator (S50);
Decompressing the vehicle by recovering the kinetic energy of the vehicle to the hydraulic energy of the accumulator when the accumulator is capable of accumulating pressure as a result of the pressure measurement of the accumulator (S60); And
When the accumulator pressure measurement is not possible as a result of the pressure measurement of the accumulator, controlling the braking device to generate a friction braking torque, comprising the step of braking the construction equipment energy recovery method for a construction machine.
The method of claim 5,
Checking a current equipment driving speed (S20) and setting a braking completion target time based on a brake pedal input electric signal value (S30);
Calculating a target deceleration by the set braking completion target time and the measured current equipment traveling speed (S40); And
If the target deceleration is not satisfied in the step of recovering the kinetic energy as hydraulic energy (S60), controlling the braking device to generate a friction braking torque together to perform braking of construction equipment desired (S70). );
Energy recovery method of the construction machine further comprising. delete delete delete delete
KR1020130038626A 2013-04-09 2013-04-09 Energy regenerating construction equipment and energy regenerating method thereof KR102046182B1 (en)

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Application Number Priority Date Filing Date Title
KR1020130038626A KR102046182B1 (en) 2013-04-09 2013-04-09 Energy regenerating construction equipment and energy regenerating method thereof

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Application Number Priority Date Filing Date Title
KR1020130038626A KR102046182B1 (en) 2013-04-09 2013-04-09 Energy regenerating construction equipment and energy regenerating method thereof

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KR102046182B1 true KR102046182B1 (en) 2019-12-02

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3387950B2 (en) * 1993-01-13 2003-03-17 本田技研工業株式会社 Vehicle braking force control device
JPH0978633A (en) * 1995-09-13 1997-03-25 Komatsu Ltd Running vibration limiting hydraulic circuit for wheel type construction machine
JPH10157484A (en) * 1996-11-27 1998-06-16 Mitsubishi Motors Corp Braking energy regenerating device

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