KR101641272B1 - Drive merge control system for construction machine - Google Patents

Drive merge control system for construction machine Download PDF

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Publication number
KR101641272B1
KR101641272B1 KR1020147016875A KR20147016875A KR101641272B1 KR 101641272 B1 KR101641272 B1 KR 101641272B1 KR 1020147016875 A KR1020147016875 A KR 1020147016875A KR 20147016875 A KR20147016875 A KR 20147016875A KR 101641272 B1 KR101641272 B1 KR 101641272B1
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KR
South Korea
Prior art keywords
traveling
hydraulic pump
spool
hydraulic
control
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KR1020147016875A
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Korean (ko)
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KR20140110871A (en
Inventor
이상희
정해균
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
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Priority to PCT/KR2011/010035 priority Critical patent/WO2013094793A1/en
Publication of KR20140110871A publication Critical patent/KR20140110871A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2221Control of flow rate; Load sensing arrangements
    • E02F9/2239Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • E02F9/2242Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2221Control of flow rate; Load sensing arrangements
    • E02F9/2232Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2282Systems using center bypass type changeover valves
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2285Pilot-operated systems
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2292Systems with two or more pumps
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2296Systems with a variable displacement pump

Abstract

Disclosed is a traveling confluence control system capable of ensuring a traveling speed by joining a pump discharge flow rate of a low RPM and a low volume at a high speed running of a wheel type excavator. In the running confluence control system according to the present invention, there is provided an electronic control variable capacity type first and second hydraulic pumps, a hydraulic type pedal, a work mode selection switch, a traveling spool, at least one work device spool, Of the second hydraulic pump is switched to the block state and the second hydraulic pump side hydraulic oil is merged with the hydraulic oil of the first hydraulic pump, A first proportional control valve for supplying a second signal pressure proportional to a control signal from the outside to the traveling merging spool and the CBP spool, A control signal is output to an electronic control valve provided in the first and second hydraulic pumps, and a control signal is output to the first proportional control valve The present invention provides a traveling confluence control system including a controller.

Description

[0001] DRIVE MERGE CONTROL SYSTEM FOR CONSTRUCTION MACHINE [0002]
The present invention relates to a running confluence control system for a construction machine, and more particularly, to a traveling confluence control system for a construction machine capable of securing a predetermined running speed using a low RPM and low- ≪ / RTI >
The traveling joining control system of the wheel type construction machine according to the prior art shown in Fig.
A power generator 1 (referred to as an engine)
(Hereinafter referred to as "first and second hydraulic pumps") 2,3 connected to the power generator 1,
A traveling spool 5 installed in the flow path 4 of the first hydraulic pump 2 for controlling start, stop and direction switching of a hydraulic motor (not shown)
A working device spool 7 installed in the flow path 6 of the second hydraulic pump 3 for controlling start, stop and direction switching of a working device such as a boom during switching,
A hydraulic type traveling pedal 8 for outputting a traveling signal pressure in proportion to the manipulated variable,
A work mode selection switch 9 for selecting a work mode or a traveling mode,
(2, 3) provided in the first and second hydraulic pumps (2, 3) so as to control the RPM of the power generator (1) in correspondence with the traveling signal pressure and to control the discharge flow rate of the first and second hydraulic pumps And a controller 10 for outputting control signals to the control valves 2a, 3a (PPRV).
Reference numeral 11 denotes a main control valve (MCV). Reference numeral 12 denotes a pressure sensing device for detecting a pressure corresponding to the pressure applied to the traveling pedal 8 and transmitting a detection signal to the controller 10. Reference numeral 13 denotes a power generation device 1), and transmits a detection signal to the controller 10. The RPM detection device detects the RPM of the RPM 1,
Therefore, when the driver operates the operation mode selection switch 9 to select the running mode and then presses the traveling pedal 8, the traveling spool 5 is shown by the traveling signal pressure corresponding to the pressing of the traveling pedal 8 And the left direction. At this time, the pressure signal detected by the pressure sensing device 12 is transmitted to the controller 10.
Therefore, the controller 10 outputs a control signal to the power generator 1 to increase the RPM of the power generator 1 so as to be proportional to the signal pressure, and to increase the RPM of the electronic control valve (not shown) provided in the first hydraulic pump 2 2a to output a flow rate corresponding to the signal pressure. The hydraulic fluid discharged from the first hydraulic pump 2 is supplied to the traveling spool 5 along the flow path 4 to drive the traveling motor.
In the traveling merging control system of the construction machine according to the prior art shown in FIG. 2,
A power generator 1,
First and second hydraulic pressure pumps (2, 3) of the electronically controlled variable displacement type connected to the power generation device (1)
A traveling spool 5 installed in the flow path 4 of the first hydraulic pump 2 for controlling the start, stop and direction switching of the hydraulic motor in switching,
A working device spool 7 installed in the flow path 6 of the second hydraulic pump 3 for controlling start, stop and direction switching of a working device such as a boom during switching,
A work mode selection switch 9 for selecting a work mode or a traveling mode,
A hydraulic pedal 14 mechanically connected to an electric control switch (not shown) for outputting a traveling signal current value according to the manipulated variable,
The first and second hydraulic pumps 2 and 3 are controlled so as to control the RPM of the power generator 1 and to control the discharge flow rate of the first and second hydraulic pumps 2 and 3 in accordance with the current value of the hydraulic control pedal 14 operated by the electric control switch, And a controller (10) for outputting control signals to the electronic control valves (2a, 3a) provided in the hydraulic pumps (2, 3).
The configuration excluding the detection of the operation amount of the traveling pedal 14 by the current value inputted to the controller 10 when the electric control switch of the traveling pedal 14 is operated by the driver is similar to the configuration of the traveling control The detailed description of the configuration and operation thereof will be omitted, and the same reference numerals will be used for the duplicated configurations.
In the traveling merging control system of the construction machine according to the prior art shown in FIG. 3,
A power generator 1,
First and second hydraulic pressure pumps (2, 3) of the electronically controlled variable displacement type connected to the power generation device (1)
A traveling spool 5 installed in the flow path 4 of the first hydraulic pump 2 for controlling the start, stop and direction switching of the hydraulic motor in switching,
A working device spool 7 installed in the flow path 6 of the second hydraulic pump 3 for controlling start, stop and direction switching of a working device such as a boom during switching,
A work mode selection switch 9 for selecting a work mode or a traveling mode,
An electric traveling pedal 15 for outputting a traveling signal current value in proportion to the manipulated variable,
A proportional control valve 17 for outputting a pilot signal pressure supplied from the pilot pump 16 to the running spool 5 so as to be proportional to a control signal from the outside,
The RPM of the power generator 1 is controlled to correspond to the current value of the operation of the electric traveling pedal 15 and the first and second hydraulic pumps 2, 3 are controlled to control the discharge flow rate of the first and second hydraulic pumps 2, (10) for outputting a control signal to the electronic control valves (2a, 3a) provided in the control valves (2, 3).
At this time, an operation amount of the traveling pedal 15 is detected by a current value inputted to the controller 10 when the electric driving pedal 15 is operated by the driver, and the proportional control valve 17 is controlled by the control signal And the control of the traveling spool 5 is the same as the configuration of the running control system shown in Fig. 1, so that detailed description of these configurations and operations will be omitted, .
As described above, in the wheel type excavator according to the related art, only the first hydraulic pump 2 or the second hydraulic pump 3 described above is used, and the hydraulic fluid necessary for traveling is used. In this case, since the wheel type excavator must be able to travel at a higher speed than the track type excavator, generally, a high RPM and a large capacity hydraulic pump are used in comparison with a tracked excavator of the same class.
Therefore, the cost of the entire equipment is increased due to an increase in the cost of parts cost, and the problem of the fuel consumption rate of the equipment is deteriorated.
In the embodiment of the present invention, when a wheel type excavator is traveling at a high speed, a plurality of hydraulic pump discharge flow rates are merged so that a predetermined running speed can be secured even in a low RPM and low-capacity pump, And it is related to a running confluence control system of a construction machine for improving fuel economy.
In the running confluence control system for a construction machine according to the first embodiment of the present invention,
A power generation device,
An electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,
A hydraulic pedal for outputting a driving signal pressure proportional to the manipulated variable,
A work mode selection switch for selecting a work mode or a travel mode,
A traveling spool installed in the flow path of the first hydraulic pump for controlling the start, stop and direction switching of the hydraulic motor at the time of switching,
At least one work device spool installed in a flow path of the second hydraulic pump for controlling start, stop and direction switching of the work device during switching,
The first hydraulic pump is provided on the upstream side of the second hydraulic pump and the flow rate of the first hydraulic pump is supplied to the downstream side of the traveling spool while the flow rate of the second hydraulic pump is supplied to the tandem passage of the second hydraulic pump, A traveling confluent spool for switching the flow path of the hydraulic pump to the block state and supplying the second hydraulic pump side working fluid to the upstream side of the traveling spool through the confluent flow path to merge with the working fluid of the first hydraulic pump,
A CBP spool installed at the most downstream side of the flow path of the second hydraulic pump and forming a working pressure in the tandem flow path of the second hydraulic pump at the time of switching,
A first proportional control valve for supplying a secondary signal pressure outputted to be proportional to a control signal from the outside to the traveling merging spool and the CBP spool,
Controls the RPM of the power generating device to correspond to the traveling signal pressure of the traveling pedal and outputs a control signal to the electronic control valve provided in the first and second hydraulic pumps so as to control the discharge flow rate of the first and second hydraulic pumps, And a controller for outputting a control signal to one proportional control valve.
In the traveling merge control system of the construction machine according to the second embodiment of the present invention,
A power generation device,
An electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,
A hydraulic driving pedal mechanically connected to an electric control switch for outputting a traveling signal current value according to an operation amount,
A work mode selection switch for selecting a work mode or a travel mode,
A traveling spool installed in the flow path of the first hydraulic pump for controlling the start, stop and direction switching of the hydraulic motor at the time of switching,
At least one work device spool installed in a flow path of the second hydraulic pump for controlling start, stop and direction switching of the work device during switching,
The first hydraulic pump is provided on the upstream side of the second hydraulic pump and the flow rate of the first hydraulic pump is supplied to the downstream side of the traveling spool while the flow rate of the second hydraulic pump is supplied to the tandem passage of the second hydraulic pump, A traveling confluent spool for switching the flow path of the hydraulic pump to the block state and supplying the second hydraulic pump side working fluid to the upstream side of the traveling spool through the confluent flow path to merge with the working fluid of the first hydraulic pump,
A CBP spool installed at the most downstream side of the flow path of the second hydraulic pump and forming a working pressure in the tandem flow path of the second hydraulic pump at the time of switching,
A first proportional control valve for supplying a secondary signal pressure outputted to be proportional to a control signal from the outside to the traveling merging spool and the CBP spool,
The electronic control valve provided in the first and second hydraulic pumps is controlled to control the RPM of the power generating device in correspondence with the current value according to the operation of the electric control switch of the traveling pedal and to control the discharge flow rate of the first and second hydraulic pumps. And outputs a control signal to the first proportional control valve.
In the traveling merging control system of the construction machine according to the third embodiment of the present invention,
A power generation device,
An electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,
An electric traveling pedal for outputting a traveling signal current value in proportion to the manipulated variable,
A work mode selection switch for selecting a work mode or a travel mode,
A traveling spool installed in the flow path of the first hydraulic pump for controlling the start, stop and direction switching of the hydraulic motor at the time of switching,
At least one work device spool installed in a flow path of the second hydraulic pump for controlling start, stop and direction switching of the work device during switching,
The first hydraulic pump is provided on the upstream side of the second hydraulic pump and the flow rate of the first hydraulic pump is supplied to the downstream side of the traveling spool while the flow rate of the second hydraulic pump is supplied to the tandem passage of the second hydraulic pump, A traveling confluent spool for switching the flow path of the hydraulic pump to the block state and supplying the second hydraulic pump side working fluid to the upstream side of the traveling spool through the confluent flow path to merge with the working fluid of the first hydraulic pump,
A CBP spool installed at the most downstream side of the flow path of the second hydraulic pump and forming a working pressure in the tandem flow path of the second hydraulic pump at the time of switching,
A first proportional control valve for supplying a secondary signal pressure outputted to be proportional to a control signal from outside to the traveling merging spool,
A proportional control valve for supplying a secondary signal pressure output to the traveling spool in proportion to a control signal from the outside,
Controls the RPM of the power generation device to correspond to the current value according to the operation of the traveling pedal and outputs a control signal to the electronic control valve provided in the first and second hydraulic pumps so as to control the discharge flow rate of the first and second hydraulic pumps , A proportional control valve, and a controller for outputting a control signal to the first proportional control valve.
According to a preferred embodiment, the present invention includes a pressure sensing device that detects a traveling signal pressure in response to the pressure of the hydraulic pedal and transmits a detection signal to the controller.
And an RPM sensing device for detecting the RPM of the power generating device and transmitting the detection signal to the controller.
As the first and second hydraulic pumps described above,
A mechanical variable displacement type hydraulic pump for variably controlling the discharge flow rate by a regulator operated by a control signal pressure from the outside is used.
A control valve for outputting a control signal to each of the traveling confluence spool and the CBP spool,
And a solenoid valve that is switched by a control signal input from the controller to supply the pilot signal pressure to switch the traveling merge spool and the CBP spool when the traveling mode is selected by operating the operation mode selection switch.
The traveling joining control system of the construction machine according to the embodiment of the present invention as described above has the following advantages.
When the wheel type excavator is driven at a high speed, the discharge flow rates of the low RPM and low capacity pumps are joined together to secure a predetermined traveling speed, thereby reducing the equipment cost cost and improving the fuel efficiency.
1 is a hydraulic circuit diagram according to a first embodiment of the prior art,
2 is a hydraulic circuit diagram according to a second embodiment of the prior art,
3 is a hydraulic circuit diagram according to a third embodiment of the prior art,
4 is a hydraulic circuit diagram of a traveling joining control system for a construction machine according to the first embodiment of the present invention,
5 is a hydraulic circuit diagram of a traveling joining control system of a construction machine according to a second embodiment of the present invention,
6 is a hydraulic circuit diagram of a traveling joining control system of a construction machine according to a third embodiment of the present invention,
FIG. 7 is a flowchart of a traveling joining control system for a construction machine according to the first embodiment of the present invention,
8 is a flowchart showing the use of a solenoid valve as a control valve for supplying a pilot signal pressure to switch the traveling confluence spool and the CBP spool in a traveling confluence control system for a construction machine according to the embodiments of the present invention.
DESCRIPTION OF THE REFERENCE NUMERALS to main parts of the drawings
One; Power generator
2; The first hydraulic pump
3; The second hydraulic pump
4.6; Euro
5; Traveling spool
7; Work device spool
8; Hydraulic pedal
9; Operation mode selection switch
10; controller
12; Pressure sensing device
13; RPM sensing device
14; Hydraulic pedal
15; Electric pedal
16; Pilot pump
17; Proportional control valve
18; Temporary Euro
19; Joining passage
20; Confluent channel
21; Traveling joining spool
22; CBP spool
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical idea and scope of the invention are limited.
The traveling joining control system of the construction machine according to the first embodiment of the present invention shown in Fig.
A power generator 1 (referred to as an engine)
First and second hydraulic pumps 2 and 3 (hereinafter, referred to as "first and second hydraulic pumps") connected to the power generator 1,
A hydraulic type travel pedal 8 for outputting a traveling signal pressure in proportion to an operation amount by the driver,
A work mode selection switch 9 for selecting a work mode or a traveling mode,
A traveling spool 5 installed in the flow path 4 of the first hydraulic pump 2 for controlling start, stop and direction switching of a hydraulic motor (not shown)
At least one work device spool (7) provided in the flow path (6) of the second hydraulic pump (3) for controlling start, stop and direction switching of a work device such as a boom during switching,
The first hydraulic pump 2 is provided on the upstream side of the flow path 6 of the second hydraulic pump 2 and the flow rate of the first hydraulic pump 2 is supplied to the downstream side of the traveling spool 5 through the flow path 25, The flow rate of the pump 3 is supplied to the tandem flow path 18 of the second hydraulic pump 3 and the flow path of the first hydraulic pump 2 is switched to a block when the pilot signal pressure of the pilot pump 16 is switched. And the hydraulic fluid on the side of the second hydraulic pump 3 is supplied to the upstream side of the traveling spool 5 through the confluent passage 19 and the confluent flow path 20 to be joined to the working oil of the first hydraulic pump 2 A traveling merge spool 21,
A CBP spool 22 installed at the most downstream side of the flow path 6 of the second hydraulic pump 2 and forming operating pressure in the tandem passage 18 of the second hydraulic pump 3 at the time of switching,
A first proportional control valve 23 that is provided in the flow path of the pilot pump 16 and supplies a secondary signal pressure output to the CBP spool 22 to the traveling merging spool 21 and the CBP spool 22, )Wow,
The first and second hydraulic pumps 2 and 3 are controlled so as to control the RPM of the power generating device 1 and to control the discharge flow rate of the first and second hydraulic pumps 2 and 3 in correspondence with the traveling signal pressure of the traveling pedal 8, And a controller 10 for outputting a control signal to the electronic control valves 2a, 3a (PPRV) provided in the first proportional control valve 3 and outputting an electrical control signal to the first proportional control valve 23, respectively.
And a pressure sensing device 12 for detecting a traveling signal pressure in response to the pressure of the hydraulic traveling pedal 8 and transmitting a detection signal to the controller 10.
And a RPM sensing device 13 for detecting the RPM of the power generation device 1 and transmitting the detection signal to the controller 10. [
Although not shown in the drawing, as the first and second hydraulic pumps 2 and 3 described above,
A mechanical variable displacement type hydraulic pump that variably controls the discharge flow rate by a regulator operated by a control signal pressure from the outside can be used.
At this time, a running confluence spool (not shown) which is provided on the upstream side of the flow path 6 of the second hydraulic pump 3 and joins the operating oil of the second hydraulic pump 3 to the operating oil of the first hydraulic pump 2 A CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3 and a CBP spool 22 connected to the traveling merge spool 21 and the CBP spool 22 by an electric control signal from the controller 10. [ 22 except for the first proportional control valve 23 that outputs the secondary signal pressure is the same as the configuration of the traveling confluence control system shown in Fig. 1, The same reference numerals are used to denote redundant components.
Hereinafter, use examples of a traveling confluence control system for a construction machine according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.
4 and 7, it is determined whether or not the driving mode according to the operation of the driver's operation mode selection switch 9 is selected. If the driving mode is selected, the process proceeds to the next step (see S200) (S100).
As in S200, when the running mode is selected, the running spool 5 is switched to the left direction in the drawing by the running signal pressure outputted in accordance with the pressure of the hydraulic type pedal 8. At the same time, the pressure sensor 12 detects the pressure of the traveling signal in response to the pressing of the traveling pedal 8, and the detection signal is transmitted to the controller 10.
Therefore, the controller 10 outputs a control signal to the power generator 1 so as to be proportional to the running signal pressure to control the RPM of the power generator 1. And the control signal corresponding to the traveling signal pressure is outputted to the electromagnetic control valve 2a provided in the first hydraulic pump 2 to control the flow rate of the first hydraulic pump 2. [
As in S300, it is determined whether or not the traveling signal pressure is equal to or greater than the joining time point. If the joining time point is equal to or greater than the joining time point, the process proceeds to S400. Otherwise, the process proceeds to S900.
When the traveling signal pressure exceeds the joining time point (that is, when the traveling signal pressure detected by the pressure-sensing device 12 is higher than the preset joining point pressure) as in S400, The RPM of the power generator 1 is controlled.
As in S500, as the driver presses the traveling pedal 8 more quickly than the speed corresponding to the maximum flow rate of the first hydraulic pump 2, the controller 10 causes the second hydraulic pump 3 And outputs the control signal to the proportional valve 3 a and the first proportional control valve 23.
As in S500, the first proportional control valve 23 outputs a secondary signal pressure proportional to the running signal pressure. Therefore, when the traveling merging spool 21 and the CBP spool 22 are gradually shifted by the secondary signal pressure output by the first proportional control valve 23, the hydraulic oil discharged from the second hydraulic pump 3 A part of the working oil of the second hydraulic pump 3 is moved to the tandem flow path 18 via the flow path 6 and the traveling confluence spool 21 and at the same time a part of the operating oil of the second hydraulic pump 3 flows through the confluent flow path 19 and the confluent flow path 20 So that the flow rate discharged from the first hydraulic pump 2 starts to merge with the flow rate.
Since the secondary signal pressure by the first proportional control valve 23 and the opening area of the CBP spool 22 are in inverse proportion to each other as in S600, when the driver pushes the traveling pedal 8 a little more, The flow path of the gasket 22 is completely cut off.
Since the secondary signal pressure by the first proportional control valve 23 and the opening area of the converging passage 19 are proportional to each other as in S700, all of the operating oil discharged from the second hydraulic pump 3 flows into the confluent passage 19 And the confluent flow path 20 to the upstream side of the traveling spool 5.
All the flow rate discharged from the second hydraulic pump 3 after the merging point is merged with the discharge flow rate of the first hydraulic pump 2, as in S800. That is, the combined flow rate, which is the flow rate of the second hydraulic pump 3 joined to the flow rate of the first hydraulic pump 2, can be supplied to the traveling motor at the flow rate required for the maximum speed of the equipment.
On the other hand, as in S900, when the traveling signal pressure is before the joining time, the RPM of the power generator 1 is controlled to be proportional to the traveling signal pressure.
The flow rate of the first hydraulic pump 2 is controlled by outputting a control signal to the proportional valve 2a of the first hydraulic pump 2 so as to correspond to the traveling signal pressure as in S1000.
Although not shown in the drawing, as a control valve for outputting control signals to the traveling confluence spool 21 and the CBP spool 22,
When the traveling mode is selected by operating the operation mode selection switch 9, the pilot signal pressure is switched so as to switch the traveling merge spool 21 and the CBP spool 22 by switching by the control signal inputted from the controller 10 And a solenoid valve (not shown).
8, it is determined whether or not the driving mode is selected by the operation of the operation mode selection switch 9. If the driving mode is selected, the process proceeds to the next step S20. If the driving mode is not selected, the process is terminated ).
When the running mode is selected as in S20, the solenoid valve is switched to the ON state by the control signal from the controller 10. [ As a result, the pilot signal pressure from the pilot pump 16 is supplied to the traveling merging spool 21 and the CBP spool 22, respectively, and these are switched.
As in S30, the pressure sensor 12 detects the traveling signal pressure in response to the pressing of the traveling pedal, and the detection signal is transmitted to the controller 10. [
The RPM of the power generator 1 is controlled by a control signal inputted from the controller 10 so as to be proportional to the detected running signal pressure as in S40 (see graph curve "a").
As in S50, the discharge flow rate of the hydraulic pump can be controlled corresponding to the traveling signal pressure. (C) shown by the dotted line in comparison with the discharge flow rates respectively discharged from the first hydraulic pump 2 and the second hydraulic pump 3 as shown in the graph curve b shown by the solid line in FIG. It can be confirmed that the combined flow rate of the flow of the second hydraulic pump 3 joined to the flow rate of the first hydraulic pump 2 can discharge the flow rate required for the maximum speed of the equipment.
In the traveling merging control system of the construction machine according to the second embodiment of the present invention shown in FIG. 5,
A power generator 1 (referred to as an engine)
(Hereinafter referred to as "first and second hydraulic pumps") 2,3 connected to the power generator 1,
A hydraulic traveling pedal 14 to which an electric control switch for outputting a traveling signal current value according to the manipulated variable is mechanically connected,
A work mode selection switch 9 for selecting a work mode or a traveling mode,
A traveling spool 5 provided in the flow path 4 of the first hydraulic pump 2 for controlling start, stop and direction switching of a hydraulic motor (not shown)
At least one work device spool (7) provided in the flow path (6) of the second hydraulic pump (3) for controlling start, stop and direction switching of a work device such as a boom during switching,
The flow rate of the first hydraulic pump 2 in the neutral state is supplied to the downstream side of the traveling spool 5 through the flow path 25 and the second hydraulic pump 2 is provided on the upstream side of the flow path 6 of the second hydraulic pump 3, The flow rate of the first hydraulic pump 3 is supplied to the tandem passage 18 of the second hydraulic pump 3 and the flow path of the first hydraulic pump 2 is blocked when the pilot signal pressure of the pilot pump 16 is switched. And the hydraulic fluid on the side of the second hydraulic pump 3 is supplied to the upstream side of the traveling spool 5 through the confluent passage 19 and the confluent flow path 20 to be joined to the working oil of the first hydraulic pump 2 A traveling merge spool 21,
A CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3 and forming operating pressure in the tandem flow path 18 of the second hydraulic pump 3 upon switching,
A first proportional control valve 23 for supplying a secondary signal pressure output to be proportional to an electrical control signal from the outside to the traveling merging spool 21 and the CBP spool 22,
The RPM of the power generator is controlled to correspond to the current value of the electric control switch of the traveling pedal 14, and the first and second hydraulic pumps 2, 3 are controlled to control the discharge flow rate of the first and second hydraulic pumps 2, And a controller 10 for outputting a control signal to the electronic control valves 2a and 3a provided in the first and second proportional control valves 2 and 3 and outputting an electrical control signal to the first proportional control valve 23.
At this time, a running confluence spool (not shown) which is provided on the upstream side of the flow path 6 of the second hydraulic pump 3 and joins the operating oil of the second hydraulic pump 3 to the operating oil of the first hydraulic pump 2 A CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3 and a CBP spool 22 connected to the traveling merge spool 21 and the CBP spool 22 by an electric control signal from the controller 10. [ 22 except for the first proportional control valve 23 that outputs the secondary signal pressure is the same as that of the traveling confluence control system shown in Fig. 2, The same reference numerals are used to denote redundant components.
Hereinafter, use examples of a traveling confluence control system for a construction machine according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.
5, when the driver operates the electric control switch (not shown) provided on the traveling pedal 14 to detect the operation amount of the traveling pedal 14 by the current value directly input to the controller 10 . This makes the components of the pressure sensing device 12 shown in Fig. 4 unnecessary.
That is, the traveling spool 5 is switched by operating the electric control switch of the traveling pedal 14, and at the same time, the controller 10 detects the operation amount of the traveling pedal 14. Thus, the traveling confluence spool 21 and the CBP spool 22 are switched by a control signal output from the controller 10 in proportion to the manipulated variable. Therefore, the configuration in which the flow rate of the second hydraulic pump 3 is supplied to the traveling spool 5 via the traveling confluence spool 21 to merge the flow rate of the first hydraulic pump 2 with the flow rate of the first hydraulic pump 2, The configuration and detailed description thereof are omitted.
In the traveling merging control system of the construction machine according to the third embodiment of the present invention shown in FIG. 6,
A power generator 1 (referred to as an engine)
(Hereinafter referred to as "first and second hydraulic pumps") 2,3 connected to the power generator 1,
An electric traveling pedal 15 for outputting a traveling signal current value in proportion to the manipulated variable,
A work mode selection switch 9 for selecting a work mode or a traveling mode,
A traveling spool 5 provided in the flow path 4 of the first hydraulic pump 2 for controlling start, stop and direction switching of a hydraulic motor (not shown)
At least one work device spool (7) provided in the flow path (6) of the second hydraulic pump (3) for controlling start, stop and direction switching of a work device such as a boom during switching,
The flow rate of the first hydraulic pump 2 in the neutral state is supplied to the downstream side of the traveling spool 5 through the flow path 25 and the second hydraulic pump 2 is provided on the upstream side of the flow path 6 of the second hydraulic pump 3, The flow rate of the first hydraulic pump 3 is supplied to the tandem passage 18 of the second hydraulic pump 3 and the flow path of the first hydraulic pump 2 is blocked when the pilot signal pressure of the pilot pump 16 is switched. And the hydraulic fluid on the side of the second hydraulic pump 3 is supplied to the upstream side of the traveling spool 5 through the confluent passage 19 and the confluent flow path 20 to be joined to the working oil of the first hydraulic pump 2 A traveling merge spool 21,
A CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3 and forming operating pressure in the tandem flow path 18 of the second hydraulic pump 3 upon switching,
A first proportional control valve 23 for supplying a secondary signal pressure outputted to be proportional to a control signal from the outside to the traveling merging spool 21,
A proportional control valve (17) for supplying a secondary signal pressure output to the traveling spool (5) in proportion to a control signal from the outside,
The first and second hydraulic pumps (2, 3) are controlled to control the RPM of the power generator 1 in correspondence with the current value according to the operation of the traveling pedal 15 and to control the discharge flow rate of the first and second hydraulic pumps And a controller 10 for outputting a control signal to the electronic control valves 2a and 3a provided in the proportional control valve 17 and the first proportional control valve 23 and outputting control signals to the proportional control valve 17 and the first proportional control valve 23 .
At this time, a running confluence spool (not shown) which is provided on the upstream side of the flow path 6 of the second hydraulic pump 3 and joins the operating oil of the second hydraulic pump 3 to the operating oil of the first hydraulic pump 2 A CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3 and a CBP spool 22 connected to the traveling merge spool 21 and the CBP spool 22 by an electric control signal from the controller 10, 22 except for the first proportional control valve 23 that outputs the secondary signal pressure is the same as the configuration of the traveling confluence control system shown in Fig. 3, The same reference numerals are used to denote redundant components.
Hereinafter, use examples of a traveling confluence control system for a construction machine according to a third embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The operation amount of the traveling pedal 15 can be detected by the current value directly input to the controller 10 when the electric driving pedal 15 is pressed by the driver as shown in Fig. This makes the components of the pressure sensing device 12 shown in Fig. 4 unnecessary.
That is, the operation amount of the traveling pedal 15 is detected by the current value inputted to the controller 10 when the traveling pedal 15 is operated, and from the controller 10 to the proportional control valve 17 The configuration except for the control of the running spool 5 by outputting the control signal is the same as the configuration of the running confluence control system shown in Fig. 4, and thus the configuration and detailed description thereof will be omitted.
According to the present invention having the above-described configuration, when the wheel-type excavator is driven at a high speed, a low RPM and a low-capacity pump discharge flow rate are combined to secure a predetermined traveling speed, thereby reducing equipment cost and fuel economy.

Claims (13)

  1. A power generation device,
    An electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,
    A hydraulic pedal for outputting a driving signal pressure proportional to the manipulated variable,
    A work mode selection switch for selecting a work mode or a travel mode,
    A traveling spool installed in a flow path of the first hydraulic pump for controlling start, stop and direction switching of the hydraulic motor when the hydraulic motor is switched,
    At least one work device spool installed in the flow path of the second hydraulic pump for controlling start, stop and direction switching of the work device during switching,
    Wherein the first hydraulic pump is provided at a downstream side of the traveling spool and the second hydraulic pump is provided at a flow rate of the second hydraulic pump to a tandem passage of the second hydraulic pump, The first hydraulic pump side hydraulic oil is switched to the block state and the second hydraulic pump side hydraulic oil is supplied to the upstream side of the traveling spool through the confluent flow path to join the working oil of the first hydraulic pump to the hydraulic oil of the first hydraulic pump,
    A CBP spool installed at the most downstream side of the flow path of the second hydraulic pump and forming operating pressure in the tandem passage of the second hydraulic pump when the second hydraulic pump is switched,
    A first proportional control valve for supplying a secondary signal pressure outputted to be proportional to a control signal from the outside to the traveling confluence spool and the CBP spool,
    A control signal is output to an electronic control valve provided in the first and second hydraulic pumps so as to control the RPM of the power generator in correspondence with the traveling signal pressure of the traveling pedal and to control the discharge flow rate of the first and second hydraulic pumps And a controller for outputting a control signal to the first proportional control valve.
  2. The traveling confluence control system of a construction machine according to claim 1, further comprising a pressure sensing device for detecting a traveling signal pressure in response to the pressure of the hydraulic type pedal and transmitting a detection signal to the controller.
  3. 2. The traveling confluence control system of a construction machine according to claim 1, comprising an RPM sensing device for detecting the RPM of the power generation device and transmitting a detection signal to the controller.
  4. 2. The hydraulic pump according to claim 1,
    Wherein a mechanical variable displacement hydraulic pump for variably controlling a discharge flow rate by a regulator operated by a control signal pressure from the outside is used.
  5. The control valve according to claim 1, further comprising: a control valve for outputting control signals to the traveling confluence spool and the CBP spool,
    And a solenoid valve that is switched by a control signal input from the controller to supply the pilot signal pressure to switch the traveling confluence spool and the CBP spool when the traveling mode is selected by operating the operation mode selection switch A running confluence control system of a construction machine.
  6. A power generation device,
    An electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,
    A hydraulic driving pedal mechanically connected to an electric control switch for outputting a traveling signal current value according to an operation amount,
    A work mode selection switch for selecting a work mode or a travel mode,
    A traveling spool installed in a flow path of the first hydraulic pump for controlling start, stop and direction switching of the hydraulic motor when the hydraulic motor is switched,
    At least one work device spool installed in the flow path of the second hydraulic pump for controlling start, stop and direction switching of the work device during switching,
    Wherein the first hydraulic pump is provided at a downstream side of the traveling spool and the second hydraulic pump is provided at a flow rate of the second hydraulic pump to a tandem passage of the second hydraulic pump, The first hydraulic pump side hydraulic oil is switched to the block state and the second hydraulic pump side hydraulic oil is supplied to the upstream side of the traveling spool through the confluent flow path to join the working oil of the first hydraulic pump to the hydraulic oil of the first hydraulic pump,
    A CBP spool installed at the most downstream side of the flow path of the second hydraulic pump and forming operating pressure in the tandem passage of the second hydraulic pump when the second hydraulic pump is switched,
    A first proportional control valve for supplying a secondary signal pressure outputted to be proportional to a control signal from the outside to the traveling confluence spool and the CBP spool,
    And an electronic control unit provided in the first and second hydraulic pumps so as to control the RPM of the power generation device in accordance with the current value of the electric control switch of the traveling pedal and control the discharge flow rate of the first and second hydraulic pumps, And a controller for outputting a control signal to the valve and outputting a control signal to the first proportional control valve.
  7. The traveling confluence control system of a construction machine according to claim 6, comprising an RPM sensing device for detecting the RPM of the power generating device and transmitting a detection signal to the controller.
  8. The hydraulic control apparatus according to claim 6, wherein the first and second hydraulic pumps
    Wherein a mechanical variable displacement hydraulic pump for variably controlling a discharge flow rate by a regulator operated by a control signal pressure from the outside is used.
  9. 7. The control valve according to claim 6, further comprising a control valve for outputting control signals to the traveling confluence spool and the CBP spool, respectively
    And a solenoid valve that is switched by a control signal input from the controller to supply the pilot signal pressure to switch the traveling confluence spool and the CBP spool when the traveling mode is selected by operating the operation mode selection switch A running confluence control system of a construction machine.
  10. A power generation device,
    An electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,
    An electric traveling pedal for outputting a traveling signal current value in proportion to the manipulated variable,
    A work mode selection switch for selecting a work mode or a travel mode,
    A traveling spool installed in a flow path of the first hydraulic pump for controlling start, stop and direction switching of the hydraulic motor when the hydraulic motor is switched,
    At least one work device spool installed in the flow path of the second hydraulic pump for controlling start, stop and direction switching of the work device during switching,
    Wherein the first hydraulic pump is provided at a downstream side of the traveling spool and the second hydraulic pump is provided at a flow rate of the second hydraulic pump to a tandem passage of the second hydraulic pump, The first hydraulic pump side hydraulic oil is switched to the block state and the second hydraulic pump side hydraulic oil is supplied to the upstream side of the traveling spool through the confluent flow path to join the working oil of the first hydraulic pump to the hydraulic oil of the first hydraulic pump,
    A CBP spool installed at the most downstream side of the flow path of the second hydraulic pump and forming operating pressure in the tandem passage of the second hydraulic pump when the second hydraulic pump is switched,
    A first proportional control valve for supplying a secondary signal pressure output to the traveling confluence spool in proportion to a control signal from the outside,
    A proportional control valve for supplying a secondary signal pressure output to the traveling spool in proportion to a control signal from the outside,
    A control signal for controlling the RPM of the power generator in accordance with the current value of the operation of the traveling pedal and for controlling the discharge flow rate of the first and second hydraulic pumps, And a controller for outputting a control signal to the proportional control valve and the first proportional control valve.
  11. 11. The traveling confluence control system of a construction machine according to claim 10, comprising a RPM sensing device for detecting the RPM of the power generation device and transmitting a detection signal to the controller.
  12. 11. The hydraulic control apparatus according to claim 10, wherein the first and second hydraulic pumps
    Wherein a mechanical variable displacement hydraulic pump for variably controlling a discharge flow rate by a regulator operated by a control signal pressure from the outside is used.
  13. 11. The control valve according to claim 10, further comprising: a control valve for outputting control signals to the traveling merge spool and the CBP spool
    And a solenoid valve that is switched by a control signal input from the controller to supply the pilot signal pressure to switch the traveling confluence spool and the CBP spool when the traveling mode is selected by operating the operation mode selection switch A running confluence control system of a construction machine.
KR1020147016875A 2011-12-23 2011-12-23 Drive merge control system for construction machine KR101641272B1 (en)

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JP2007321972A (en) 2006-06-05 2007-12-13 Kayaba Ind Co Ltd Power unit for construction machine

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KR200378443Y1 (en) * 1999-05-26 2005-03-16 현대중공업 주식회사 Travel control system for construction equipment which is operated by oil pressure
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KR101157267B1 (en) * 2005-12-28 2012-07-03 두산인프라코어 주식회사 Hydraulic control system for a travel-combined-operation of en excavator
KR100961433B1 (en) * 2008-10-13 2010-06-09 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 hydraulic system of construction equipment

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JP2007321972A (en) 2006-06-05 2007-12-13 Kayaba Ind Co Ltd Power unit for construction machine

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