CN108466932B - Hydraulic speed regulating system for chassis power taking and driving vehicle - Google Patents
Hydraulic speed regulating system for chassis power taking and driving vehicle Download PDFInfo
- Publication number
- CN108466932B CN108466932B CN201810504030.4A CN201810504030A CN108466932B CN 108466932 B CN108466932 B CN 108466932B CN 201810504030 A CN201810504030 A CN 201810504030A CN 108466932 B CN108466932 B CN 108466932B
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- CN
- China
- Prior art keywords
- variable pump
- quantitative motor
- electric control
- control variable
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20523—Internal combustion engine
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
Abstract
The invention relates to the field of power equipment, in particular to a chassis power taking and driving hydraulic speed regulating system, which comprises a power takeoff, an electric control variable pump, a three-way flow valve and a quantitative motor for driving a load, wherein the input end of the power takeoff is connected with the output end of the power takeoff, the three-way flow valve is provided with an oil inlet, an oil outlet and an oil discharging port, the oil inlet is connected with a high-pressure port of the electric control variable pump, the oil outlet is connected with an oil inlet of the quantitative motor, and the oil discharging port is connected with a system oil return/hydraulic oil tank. The device provided by the invention has the advantages of simple structure, energy conservation and high efficiency.
Description
Technical Field
The invention belongs to the field of power equipment, and particularly relates to a chassis power taking and driving hydraulic speed regulating system.
Background
The main difference between a traveling crane hydraulic speed regulation system taking force from a vehicle chassis as a power source and a general hydraulic speed regulation system is that: in the working process of the travelling hydraulic speed regulating system, the rotation speed of the system power source, namely the chassis engine, always changes unexpectedly, so that the working state of the system changes, and the normal working of the system is affected. For a system which needs to keep a constant load in the driving process, two main speed regulating systems exist at present:
1. the speed regulation system adopting the variable pump and the quantitative motor has the following working principle: the operating speed of the load is determined by the speed of the fixed motor, which is determined by the output flow of the variable pump, which is the product of the speed of the variable pump and its displacement. Let the rotation speed of the motor be n when the motor is working normally M With a displacement of V M At this time, the rotation speed of the variable pump is n p Row ofThe amount is V p Irrespective of the influence of the volumetric efficiency of the pump and motor, there are: v (V) M n M ＝V P n P 。
When the load working state needs to be maintained, V needs to be ensured M n M Is a fixed value. When the rotation speed of the chassis engine changes at a certain moment, the rotation speeds of the variable pump and the quantitative motor are sequentially changed, when the system detects that the rotation speed of the quantitative motor changes, the system responds, and the displacement V of the variable pump is regulated p The output flow is matched with the motor flow demand, and the change randomness of the engine speed is large, so that the output flow cannot be predicted, the system is regulated always after the engine speed is changed, namely, hysteresis exists, and no matter how fast the response speed of the controller is, the time difference generated in the process of identifying the engine speed cannot be eliminated.
2. The working principle of the quantitative pump, the flow valve and the quantitative motor speed regulating system is as follows: the working speed of the load is determined by the speed of the quantitative motor, the speed of the quantitative motor is determined by the flow valve, and the output flow of the quantitative pump at any moment is not smaller than the flow required by the motor. The displacement of the metering pump is thus selected at the lowest operating speed.
When the rotation speed of the engine changes, the output flow of the quantitative pump changes, the flow flowing through the quantitative motor is always kept constant due to the control of the flow valve, the redundant flow returns to the oil tank through the overflow valve, the displacement of the quantitative pump is not adjustable, the flow of the system is greatly different under the conditions of low rotation speed and high rotation speed of the engine, when the rotation speed of the engine is higher, the main flow of the system is split in an overflow mode, and the overall efficiency of the system is lower.
Disclosure of Invention
The invention aims to solve the technical problem of providing the chassis power taking and driving hydraulic speed regulating system which is simple in structure, capable of compensating the hysteresis response of the system, energy-saving and efficient.
The invention is realized by the following technical scheme:
the chassis power taking and driving hydraulic speed regulating system comprises a power taking device, an electric control variable pump, a three-way flow valve and a quantitative motor, wherein the input end of the power taking device is connected with the output end of a chassis engine, the quantitative motor is used for driving a load, the input end of the electric control variable pump is connected with the output end of the power taking device, the three-way flow valve is provided with an oil inlet, an oil outlet and an oil discharging port, the oil inlet is connected with a high-pressure port of the electric control variable pump, the oil outlet is connected with an oil inlet of the quantitative motor, and the oil discharging port is connected with a system oil return/hydraulic oil tank.
The beneficial effects of the invention are that
The chassis power taking and driving hydraulic speed regulating system is provided with a three-way flow valve, an oil inlet of the three-way flow valve is connected with a high-pressure port of an electric control variable pump, an oil outlet of the three-way flow valve is connected with an oil inlet of a quantitative motor, an oil discharging port of the three-way flow valve is connected with a system oil return/hydraulic oil tank, the structure is simpler, and compared with the variable pump and the quantitative motor speed regulating system, the influence caused by hysteresis of a controller is reduced or even eliminated. Meanwhile, as only small flow (delta Q) overflows all the time, compared with a speed regulation system of a constant delivery pump, a flow valve and a constant delivery motor, the speed regulation system has higher efficiency and saves more energy.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
in the figure, a quantitative motor, a three-way flow valve, an electric control variable pump, a load, a power takeoff, a chassis engine and a hydraulic oil tank are respectively arranged in the figure 1, the quantitative motor, the three-way flow valve, the electric control variable pump, the load, the power takeoff, the chassis engine and the hydraulic oil tank.
Detailed Description
The chassis power taking and driving hydraulic speed regulating system comprises a power takeoff 5, an electric control variable pump 3, a three-way flow valve 2 and a quantitative motor 1, wherein the input end of the power takeoff is connected with an output shaft of a chassis engine 6, the quantitative motor 1 is used for driving a load 4, the input end of the electric control variable pump is connected with the output end of the power takeoff, the three-way flow valve is provided with an oil inlet, an oil outlet and an oil discharging port, the oil inlet is connected with a high-pressure port of the electric control variable pump, the oil outlet is connected with an oil inlet of the quantitative motor, and the oil discharging port is connected with a system oil return/hydraulic oil tank 7.
When the system works, the displacement of the electric control variable pump is regulated by the controller, so that the output flow of the electric control variable pump is always a part (set as delta Q) more than the flow required by the quantitative motor, and the part of flow finally overflows through the three-way flow valve. When the rotation speed of the engine suddenly rises, the output flow of the electric control variable pump is increased, the rotation speed of the quantitative motor is kept unchanged due to the current limiting effect of the three-way flow valve, and the redundant flow overflows back to the hydraulic oil tank through the oil discharge port of the three-way flow valve. At the moment, the overflow flow is larger than DeltaQ, so that the controller can change the displacement of the electric control variable pump towards the small displacement direction, and the difference between the output flow and the quantitative motor demand flow is close to DeltaQ; when the engine speed suddenly decreases at a certain moment, assuming that the controller is not active, the output flow of the electronically controlled variable pump is inevitably reduced, and the process can be divided into two stages:
in the first stage, the output flow of the electric control variable pump still can meet the flow requirement of the quantitative motor, and the rotating speed of the quantitative motor is kept unchanged, but delta Q is gradually reduced until zero;
in the second stage, the output flow of the electric control variable pump can not meet the flow requirement of the quantitative motor, and the rotating speed of the quantitative motor is gradually reduced. Obviously, the working state of the quantitative motor is influenced only when the quantitative motor reaches the second stage, namely, the working state of the quantitative motor is not influenced as long as the controller responds in the first stage process and controls and adjusts the electric control variable pump. ,
therefore, compared with a variable pump and a quantitative motor speed regulating system, the speed regulating system reduces or even eliminates the influence caused by the hysteresis of the controller. Meanwhile, as only small flow (delta Q) overflows all the time, compared with a speed regulation system of a constant delivery pump, a flow valve and a constant delivery motor, the speed regulation system has higher efficiency and saves more energy.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The chassis power taking and driving hydraulic speed regulating system is characterized by comprising a power takeoff, an electric control variable pump, a three-way flow valve and a quantitative motor, wherein the input end of the power takeoff is connected with the output end of the chassis engine; when the engine speed suddenly decreases at a certain moment, if the controller does not work, the output of the electric control variable pump can be reduced, and the speed regulating system can be divided into two stages in the working process: in the first stage, the output flow of the electric control variable pump still can meet the flow requirement of the quantitative motor, and the rotating speed of the quantitative motor is kept unchanged, but delta Q is gradually reduced until zero; in the second stage, the output flow of the electric control variable pump can not meet the flow requirement of the quantitative motor, the rotating speed of the quantitative motor is gradually reduced, and the working state of the quantitative motor can be influenced only when the second stage is reached; if the controller responds in the first stage process, the electric control variable pump is controlled and regulated, so that the working state of the quantitative motor can not be influenced, and the influence caused by the hysteresis of the controller is eliminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810504030.4A CN108466932B (en) | 2018-05-23 | 2018-05-23 | Hydraulic speed regulating system for chassis power taking and driving vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810504030.4A CN108466932B (en) | 2018-05-23 | 2018-05-23 | Hydraulic speed regulating system for chassis power taking and driving vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108466932A CN108466932A (en) | 2018-08-31 |
| CN108466932B true CN108466932B (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810504030.4A Active CN108466932B (en) | 2018-05-23 | 2018-05-23 | Hydraulic speed regulating system for chassis power taking and driving vehicle |
Country Status (1)
| Country | Link |
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| CN (1) | CN108466932B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108869450A (en) * | 2018-09-12 | 2018-11-23 | 南通润邦重机有限公司 | A kind of low pressure huge discharge variable pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008111A (en) * | 2007-06-26 | 2009-01-15 | Hitachi Ltd | Vehicle hydraulic system |
| CN202417701U (en) * | 2012-02-03 | 2012-09-05 | 襄阳航力机电技术发展有限公司 | Vehicle-mounted intermediate frequency hydraulic power generation system |
| CN103277354A (en) * | 2013-06-20 | 2013-09-04 | 兰州力天同创流体控制装备有限公司 | Vehicle-mounted alternating-current-generating hydraulic driving device |
| EP3127856A1 (en) * | 2015-08-07 | 2017-02-08 | Linde Material Handling GmbH | Hydraulic energy saving control system for forklift and method for lowering the operating energy consumption for forklift trucks |
| CN107554290A (en) * | 2017-08-28 | 2018-01-09 | 福建龙马环卫装备股份有限公司 | A kind of cleaning vehicle of monomotor drive hydraulic system principle |
| CN208500151U (en) * | 2018-05-23 | 2019-02-15 | 天津捷强动力装备股份有限公司 | Chassis power taking driving hydraulic speed regulation system |
-
2018
- 2018-05-23 CN CN201810504030.4A patent/CN108466932B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008111A (en) * | 2007-06-26 | 2009-01-15 | Hitachi Ltd | Vehicle hydraulic system |
| CN202417701U (en) * | 2012-02-03 | 2012-09-05 | 襄阳航力机电技术发展有限公司 | Vehicle-mounted intermediate frequency hydraulic power generation system |
| CN103277354A (en) * | 2013-06-20 | 2013-09-04 | 兰州力天同创流体控制装备有限公司 | Vehicle-mounted alternating-current-generating hydraulic driving device |
| EP3127856A1 (en) * | 2015-08-07 | 2017-02-08 | Linde Material Handling GmbH | Hydraulic energy saving control system for forklift and method for lowering the operating energy consumption for forklift trucks |
| CN107554290A (en) * | 2017-08-28 | 2018-01-09 | 福建龙马环卫装备股份有限公司 | A kind of cleaning vehicle of monomotor drive hydraulic system principle |
| CN208500151U (en) * | 2018-05-23 | 2019-02-15 | 天津捷强动力装备股份有限公司 | Chassis power taking driving hydraulic speed regulation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108466932A (en) | 2018-08-31 |
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