WO2013094793A1

WO2013094793A1 - Drive merge control system for construction machine

Info

Publication number: WO2013094793A1
Application number: PCT/KR2011/010035
Authority: WO
Inventors: 이상희; 정해균
Original assignee: 볼보 컨스트럭션 이큅먼트 에이비
Priority date: 2011-12-23
Filing date: 2011-12-23
Publication date: 2013-06-27
Also published as: KR101641272B1; KR20140110871A

Abstract

Disclosed is a drive merge control system for securing a driving speed by merging low RPM and a low-capacity pump discharge flow rate when driving a wheel-type excavator at a high speed. The present invention provides the drive merge control system comprising: first and second electronically controlled variable capacity hydraulic pumps; a hydraulic drive pedal; a work mode selection switch; a drive spool and at least one work device spool; a drive merge spool, which is installed on an upstream side of a flow path of the second hydraulic pump, for blocking a flow path of the first hydraulic pump and merging hydraulic oil of the second hydraulic pump with the hydraulic oil of the first hydraulic pump; a CBP spool, which is installed on the lower-most side of a downstream of the second hydraulic pump, for creating an actuation pressure on a tandem flow path of the second hydraulic pump; a first proportional control valve for supplying a secondary signal pressure, which is outputted so as to be proportionate to an external control signal, to each of the drive merge spool and the CBP spool; and a controller for controlling the RPM of a driving force generation device in correspondence with a drive signal pressure of the drive pedal, outputting the control signal to an electronic control valves that are provided on the first and second hydraulic pumps, and for outputting the control signal to the first proportional control valve.

Description

Driving joining control system of construction machinery

The present invention relates to a running confluence control system of a construction machine, and more particularly, a driving confluence control of a construction machine to secure a predetermined traveling speed by using a pump having a low RPM and a low capacity at a high speed in a wheel type excavator. It is about the system.

The running joining control system of the wheel type construction machine according to the related art shown in FIG. 1,

Power generator 1 (engine),

Electronically controlled variable displacement first and second hydraulic pumps (hereinafter referred to as "first and second hydraulic pumps") 2 and 3 connected to the power generator 1,

Running spool 5 is installed in the flow path 4 of the first hydraulic pump 2, and controls the start, stop and direction change of the hydraulic motor (not shown) during switching;

A work device spool (7) installed in the flow path (6) of the second hydraulic pump (3) for controlling the starting, stopping, and reversing of a work device such as a boom during switching;

A hydraulic traveling pedal 8 which outputs a driving signal pressure in proportion to the operation amount;

A work mode selector switch 9 for selecting a work mode or a driving mode;

The electronics provided in the first and second

hydraulic pumps

2 and 3 to control the RPM of the power generator 1 and the discharge flow rates of the first and second

hydraulic pumps

2 and 3 to correspond to the traveling signal pressure. And a controller 10 for outputting a control signal to the

control valves

2a and 3a (PPRV).

In the drawing, reference numeral 11 denotes a main control valve (MCV), 12 denotes a pressure sensing device for detecting a pressure according to pressurization of the traveling pedal 8 and transmitting a detection signal to the

controller

10, and 13 denotes a power generator ( RPM detection device for detecting the RPM of 1) and transmits the detection signal to the controller (10).

Therefore, when the driving pedal 8 is pressed after the driving mode is selected by the driver by operating the work mode selection switch 9, the driving spool 5 is plotted by the driving signal pressure according to the pressing of the driving pedal 8. Switch to up or 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 the electronic control valve provided in the first hydraulic pump 2 ( The control signal is output to 2a) to discharge the flow rate corresponding to the signal pressure. Thus, the hydraulic oil discharged from the first hydraulic pump 2 is supplied to the traveling spool 5 side along the flow path 4 to drive the traveling motor.

Travel joining control system of a construction machine according to another prior art shown in Figure 2,

A power generator 1,

Electronically controlled variable displacement 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) and controlling the starting, stopping, and direction change of the hydraulic motor at the time of switching;

A work mode selector switch 9 for selecting a work mode or a driving mode;

A hydraulic traveling pedal 14 mechanically connected to an electric control switch (not shown) for outputting a driving signal current value according to the manipulation amount;

In order to control the RPM of the power generating device 1 and the discharge flow rates of the first and second

hydraulic pumps

2 and 3 in correspondence with the current value according to the electric control switch operation of the hydraulic traveling pedal 14. And a controller 10 for outputting a control signal to the

electronic control valves

2a and 3a provided in the two

hydraulic pumps

2 and 3.

At this time, the configuration except that the operation amount of the driving pedal 14 is detected by the current value input to the controller 10 when the driver operates the electric control switch of the driving pedal 14 is the driving control shown in FIG. 1. Since the configuration of the system is the same, detailed descriptions of their configuration and operation are omitted, and the reference numerals for the overlapping configurations are the same.

Running joining control system of the construction machine according to the prior art shown in Figure 3,

A power generator 1,

A work mode selector switch 9 for selecting a work mode or a driving mode;

An electric traveling pedal 15 for outputting a driving signal current value in proportion to the operation amount;

A proportional control valve 17 for outputting a secondary signal pressure in which the pilot signal pressure supplied from the pilot pump 16 to the traveling spool 5 is proportional to the control signal from the outside;

First and second hydraulic pumps 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 correspondence with the current value according to the operation of the electric running pedal 15. And a controller 10 for outputting a control signal to the

electronic control valves

2a and 3a provided at (2, 3).

At this time, when the electric pedal 15 is operated by the driver, the operation amount of the driving pedal 15 is detected by the current value input to the controller 10, and the control signal is supplied to the proportional control valve 17 to be proportional to the operation amount. The configuration except for controlling the traveling spool 5 by outputting the same is the same as the configuration of the traveling control system shown in FIG. 1, so that detailed descriptions of the configuration and operation thereof are omitted and the reference numerals for the overlapping configurations are the same. To be written.

As described above, in the wheel type excavator according to the related arts, the hydraulic oil required for driving is used using only one of the above-described first hydraulic pump 2 or the second hydraulic pump 3. At this time, since the wheel type excavator should be capable of traveling at a relatively high speed than the tracked excavator, the hydraulic pump having a higher RPM and a larger capacity is generally used than the tracked excavator of the same class.

Therefore, the cost of the entire equipment is increased due to the increase in the cost of parts, and the fuel consumption rate of the equipment is lowered.

According to an embodiment of the present invention, when a plurality of hydraulic pump discharge flow rates are joined at a high speed of a wheel type excavator, a predetermined traveling speed can be secured even at a low RPM and a low capacity pump, thereby reducing equipment cost costs. It is related to the driving joining control system of construction machinery to improve fuel economy.

The running joining control system of a construction machine according to a first embodiment of the present invention,

Power generator,

Electronically controlled variable displacement first and second hydraulic pumps connected to the power generating device,

Hydraulic traveling pedal to output the driving signal pressure in proportion to the operation amount,

A work mode selection switch for selecting a work mode or a driving mode;

A traveling spool which is installed in the flow path of the first hydraulic pump and controls the start, stop and direction change of the hydraulic motor during switching;

At least one work device spool installed in a flow path of the second hydraulic pump, for controlling start, stop, and direction change of the work device at the time of switching;

It is installed on the upstream side of the flow path of the second hydraulic pump, supplying the flow rate of the first hydraulic pump downstream of the running spool when neutral, and supplying the flow rate of the second hydraulic pump to the tandem flow path of the second hydraulic pump, A traveling confluence spool for converting the flow path of the hydraulic pump into a block state and supplying the hydraulic fluid on the second hydraulic pump side to an upstream side of the traveling spool through the confluence flow path and joining the hydraulic fluid of the first hydraulic pump;

A CBP spool which is installed at the downstream side of the flow path of the second hydraulic pump and forms an operating pressure in the tandem flow path of the second hydraulic pump at the time of switching;

A first proportional control valve for supplying secondary signal pressures output in proportion to a control signal from the outside to the traveling confluence spool and the CBP spool, respectively;

Controlling the RPM of the power generating device corresponding to the driving signal pressure of the driving pedal, and outputting a control signal to the electronic control valve provided in the first and second hydraulic pumps to control the discharge flow rates of the first and second hydraulic pumps; 1 includes a controller for outputting a control signal to the proportional control valve.

The running joining control system of a construction machine according to a second embodiment of the present invention,

Power generator,

A hydraulic traveling pedal mechanically connected to an electric control switch for outputting a driving signal current value according to the manipulation amount;

A work mode selection switch for selecting a work mode or a driving mode;

Control the RPM of the power generating device to correspond to the current value according to the operation of the electric control switch of the driving pedal, and to control the electronic control valve provided in the first and second hydraulic pump to control the discharge flow rate of the first and second hydraulic pump And a controller for outputting a signal and outputting a control signal to the first proportional control valve.

The running joining control system of a construction machine according to a third embodiment of the present invention,

Power generator,

An electric traveling pedal for outputting a driving signal current value in proportion to the manipulated amount;

A work mode selection switch for selecting a work mode or a driving mode;

A first proportional control valve for supplying a secondary signal pressure output in proportion to a control signal from the outside to the traveling confluence spool;

Proportional control valve for supplying the secondary signal pressure output to the traveling spool in proportion to the control signal from the outside,

To control the RPM of the power generating device corresponding to the current value according to the operation of the driving pedal, and outputs a control signal to the electronic control valve provided in the first and second hydraulic pump to control the discharge flow rate of the first and second hydraulic pump And a controller for outputting a control signal to the proportional control valve and the first proportional control valve.

According to a preferred embodiment, it includes a pressure sensing device for detecting the driving signal pressure according to the pressure of the hydraulic traveling pedal described above and transmitting the detection signal to the controller.

It includes an RPM detecting device for detecting the RPM of the power generating device described above and transmitting the detection signal to the controller.

As the above-mentioned first and second hydraulic pumps,

A mechanical variable displacement hydraulic pump which variably controls 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 above-mentioned running confluence spool and CBP spool,

And a solenoid valve for supplying pilot signal pressure so as to switch the driving confluence spool and the CBP spool when the driving mode is selected by operating the work mode selection switch.

The traveling joining control system of a construction machine according to an embodiment of the present invention as described above has the following advantages.

When driving the wheel type excavator at high speed, the discharge flow rate of the low RPM and the low capacity pump is joined to secure a predetermined driving speed, thereby reducing the cost of equipment and improving fuel economy.

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 of a construction machine according to a 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;

7 is a flowchart of a traveling joining control system for a construction machine according to a first embodiment of the present invention;

FIG. 8 is a flowchart illustrating a case where a solenoid valve is used as a control valve for supplying pilot signal pressure to switch between the traveling joining spool and the CBP spool in the traveling joining control system of a construction machine according to embodiments of the present disclosure.

One; Power generator

2; 1st hydraulic pump

3; 2nd hydraulic pump

4,6; Euro

5; Running Spool

7; Tool spool

8; Hydraulic Drive Pedal

9; Work mode selector switch

10; controller

12; Pressure sensor

13; RPM sensing device

14; Hydraulic Drive Pedal

15; Electric running pedal

16; Pilot pump

17; Proportional control valve

18; Temdom Euro

19; Confluence

20; Euro

21; Driving confluence spool

22; CBP Spool

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily carry out the invention, and thus It is not intended that the technical spirit and scope of the invention be limited.

Running joining control system of the construction machine according to the first embodiment of the present invention shown in Figure 4,

Power generator 1 (engine),

Electronically controlled variable displacement first and second

hydraulic pumps

2 and 3 connected to the power generator 1 (hereinafter referred to as "first and second hydraulic pumps"),

A hydraulic traveling pedal 8 which outputs a driving signal pressure in proportion to the amount of operation by the driver;

A work mode selector switch 9 for selecting a work mode or a driving mode;

A traveling spool (5) installed in the flow path (4) of the first hydraulic pump (2) and controlling the starting, stopping, and direction change of the hydraulic motor (not shown) during switching;

At least one work device spool (7) installed in the flow path (6) of the second hydraulic pump (3) for controlling the starting, stopping, and reversing of a work device such as a boom during switching;

It is installed on the upstream side of the flow path 6 of the second hydraulic pump 2, and when it is neutral, 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 second hydraulic pressure 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 blocked when switching by the pilot signal pressure of the pilot pump 16. ) And the hydraulic fluid of the second hydraulic pump 3 is supplied to the upstream side of the traveling spool 5 through the confluence passage 19 and the confluence passage 20 to merge with the hydraulic oil of the first hydraulic pump 2. Running confluence spool (21),

A CBP spool 22 which is installed at the downstreammost side of the flow path 6 of the second hydraulic pump 2 and forms an operating pressure in the tandem flow path 18 of the second hydraulic pump 3 during switching;

The first proportional control valve 23 installed in the flow path of the pilot pump 16 and supplying the secondary signal pressure outputted in proportion to the electric control signal from the outside to the traveling confluence spool 21 and the CBP spool 22, respectively. )Wow,

The first and second

hydraulic pumps

2 and 3 control the RPM of the power generator 1 in correspondence with the travel signal pressure of the travel pedal 8 and control the discharge flow rates of the first and second

hydraulic pumps

2 and 3. And a controller 10 for outputting control signals to the

electronic control valves

2a and 3a (PPRV) provided in 3), and for outputting an electrical control signal to the first proportional control valve 23.

And a pressure sensing device 12 that detects the driving signal pressure according to the pressurization of the hydraulic traveling pedal 8 and transmits the detection signal to the controller 10.

RPM detection device 13 for detecting the above-described RPM of the power generating device 1 and transmits a detection signal to the controller (10).

Although not shown in the drawing, the above-described first and second

hydraulic pumps

2 and 3,

A mechanical variable displacement hydraulic pump that variably controls the discharge flow rate may be used by a regulator operated by a control signal pressure from the outside.

At this time, the traveling joining spool which is installed on the upstream side of the flow path 6 of the above-mentioned second hydraulic pump 3 and joins the hydraulic fluid of the second hydraulic pump 3 side with the hydraulic oil of the first hydraulic pump 2 during switching ( 21), the CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3, and the traveling confluence spool 21 and the CBP spool ( Except for the first proportional control valve 23 for outputting the secondary signal pressure supplied to 22), the configuration is the same as that of the traveling confluence control system shown in FIG. Omitted and duplicated reference numerals are the same.

Hereinafter, a use example of the traveling joining control system for a construction machine according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 and 7, it is determined whether the driving mode is selected according to the operation of the driver's work mode selection switch 9, but if the driving mode is selected, the process proceeds to the next step (S200), and the driving mode is selected. If not, it ends (see S100).

As in S200, when the travel mode is selected, the travel spool 5 is switched to the left in the drawing by the travel signal pressure output according to the hydraulic travel pedal 8 pressure. At the same time, the pressure detection device 12 detects the travel signal pressure according to the pressurization of the travel pedal 8, but the detection signal is transmitted to the controller 10.

Therefore, the controller 10 outputs a control signal to the power generator 1 in proportion to the travel signal pressure to control the RPM of the power generator 1. In addition, the flow rate of the first hydraulic pump 2 is controlled by outputting a control signal corresponding to the driving signal pressure to the electronic control valve 2a provided in the first hydraulic pump 2.

As in S300, it is determined whether the driving signal pressure is greater than the joining time, but proceeds to S400 if the joining time or more, and proceeds to S900 if not exceeding the joining time.

As in S400, when the travel signal pressure exceeds the time of confluence (that is, when the travel signal pressure detected by the pressure sensing device 12 is higher than the pressure of the preset confluence point), it is proportional to the travel signal pressure. It is to control the RPM of the power generator (1).

As in S500, the driver 10 is required to be faster than the speed corresponding to the maximum flow rate of the first hydraulic pump 2 to further press the running pedal 8, the controller 10 in the second hydraulic pump 3 The control signal is output to the electromagnetic proportional valve 3a and the first proportional control valve 23.

As in S500, the first proportional control valve 23 outputs a secondary signal pressure proportional to the traveling signal pressure. Therefore, when gradually shifting the traveling confluence spool 21 and the CBP spool 22 by the secondary signal pressure output from the first proportional control valve 23, the hydraulic oil discharged from the second hydraulic pump 3. A part 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 working oil of the second hydraulic pump 3 passes through the joining path 19 and the joining flow path 20. Since the moving spool 5 is moved upstream, confluence with the flow rate discharged from the first hydraulic pump 2 starts.

As in S600, since the secondary signal pressure by the first proportional control valve 23 and the opening area of the CBP spool 22 are inversely proportional, when the driver presses the driving pedal 8 a little more, the CBP spool The flow path of 22 is completely blocked.

As in S700, since the secondary signal pressure by the first proportional control valve 23 and the opening area of the confluence passage 19 are proportional to each other, all the hydraulic fluid discharged from the second hydraulic pump 3 passes through the confluence passage 19 And upstream of the traveling spool 5 through the confluence passage 20.

As in S800, all the flow rates discharged from the second hydraulic pump 3 after the joining time are joined to the discharge flow rates of the first hydraulic pump 2. In other words, the combined flow rate obtained by joining the flow rate of the second hydraulic pump 3 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 driving signal pressure is before the joining time, the RPM of the power generator 1 is controlled to be proportional to the driving signal pressure.

As in S1000, the discharge flow rate of the first hydraulic pump 2 is controlled by outputting a control signal to the electromagnetic proportional valve 2a of the first hydraulic pump 2 corresponding to the traveling signal pressure.

Although not shown in the drawing, as a control valve for outputting a control signal to the above-mentioned running confluence spool 21 and CBP spool 22, respectively,

When the driving mode is selected by operating the work mode selection switch 9, the pilot signal pressure is supplied to switch between the driving confluence spool 21 and the CBP spool 22 by being switched by a control signal input from the controller 10. It may include a solenoid valve (not shown).

As shown in FIG. 8, it is determined whether the driving mode is selected by the operation of the operation mode selection switch 9, but if the driving mode is selected, the process proceeds to the next step (S20), and if the driving mode is not selected, the operation ends (S10). ).

As in S20, when the travel mode is selected, the solenoid valve is turned on by the control signal from the controller 10. For this reason, the pilot signal pressure from the pilot pump 16 is supplied to the traveling confluence spool 21 and the CBP spool 22, respectively, and is switched.

As in S30, the pressure detection device 12 detects the driving signal pressure according to the driving pedal pressure, but the detection signal is transmitted to the controller 10.

As in S40, the RPM of the power generator 1 is controlled by the control signal input from the controller 10 so as to be proportional to the detected travel signal pressure (see graph curve "a").

As in S50, the discharge flow rate of the hydraulic pump can be controlled in response to the travel signal pressure. That is, as compared with the discharge flow rates discharged from the first hydraulic pump 2 and the second hydraulic pump 3, respectively, as in the graph curve b shown by the solid line, It can be seen that the combined flow rate in which the flow rate of the two hydraulic pumps 3 is joined to the flow rate of the first hydraulic pump 2 can discharge the flow rate required for the maximum speed of the equipment.

The running joining control system of the construction machine according to the second embodiment of the present invention shown in Figure 5,

Power generator 1 (engine),

A hydraulic traveling pedal 14 mechanically connected to an electric control switch for outputting a driving signal current value according to the manipulation amount;

A work mode selector switch 9 for selecting a work mode or a driving mode;

It is installed in the upstream side of the flow path 6 of the 2nd hydraulic pump 3, When it is neutral, it supplies the flow volume of the 1st hydraulic pump 2 to the downstream side of the traveling spool 5 through the flow path 25, and the 2nd hydraulic pump The flow rate of (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 at the time of switching by the pilot signal pressure of the pilot pump 16 is a block. A state in which the hydraulic fluid is supplied to the upstream side of the traveling spool 5 through the joining passage 19 and the joining flow passage 20 is joined to the hydraulic oil of the first hydraulic pump 2. Running confluence spool (21),

A CBP spool 22 which is installed at the downstreammost side of the flow path 6 of the second hydraulic pump 3 and forms an operating pressure in the tandem flow path 18 of the second hydraulic pump 3 during switching;

A first proportional control valve 23 for supplying secondary signal pressures output in proportion to an electrical control signal from the outside to the traveling confluence valve 21 and the CBP spool 22, respectively;

First and second hydraulic pumps to control the RPM of the power generating device and to control the discharge flow rate of the first and second

hydraulic pumps

2 and 3 in correspondence with the current value according to the operation of the electric control switch of the travel pedal 14. And a controller 10 for outputting a control signal to the

electronic control valves

2a and 3a provided at (2, 3) and for outputting an electrical control signal to the first proportional control valve 23.

At this time, the traveling confluence spool which is installed on the upstream side of the flow path 6 of the above-mentioned second hydraulic pump 3 and joins the hydraulic oil of the second hydraulic pump 3 side with the hydraulic oil of the first hydraulic pump 2 during switching ( 21), the CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3, and the running confluence spool 21 and the CBP spool (by the electric control signal from the controller 10). Since the configuration except for the first proportional control valve 23 that outputs the secondary signal pressure supplied to 22) is the same as that of the traveling confluence control system shown in FIG. 2, a detailed description thereof will be given. Omitted and duplicated reference numerals are the same.

Hereinafter, a use example of the traveling joining 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.

As shown in FIG. 5, when an electric control switch (not shown) provided in the driving pedal 14 is operated by a driver, an operation amount of the driving pedal 14 may be detected by a current value directly input to the controller 10. Can be. This makes the parts of the pressure sensing device 12 shown in FIG. 4 unnecessary.

That is, the driving spool 5 is switched by the electric control switch operation of the traveling pedal 14, and at the same time, the controller 10 detects the operation amount of the traveling pedal 14. Therefore, the traveling confluence spool 21 and the CBP spool 22 are switched by the control signal output in proportion to the operation amount from the controller 10. 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 and joined with the flow rate of the first hydraulic pump 2 is the traveling confluence shown in FIG. 4. Since the configuration is the same as that of the control system, their configuration and detailed description are omitted.

Running confluence control system of a construction machine according to a third embodiment of the present invention shown in Figure 6,

Power generator 1 (engine),

A work mode selector switch 9 for selecting a work mode or a driving mode;

A first proportional control valve 23 for supplying a secondary signal pressure output in proportion to a control signal from the outside to the traveling confluence spool 21;

A proportional control valve 17 for supplying a secondary signal pressure output in proportion to a control signal from the outside to the traveling spool 5;

The first and second hydraulic pumps may be configured to control the RPM of the power generator 1 and to control the discharge flow rates of the first and second

hydraulic pumps

2 and 3 in correspondence with the current values according to the operation of the travel pedal 15. And a controller 10 for outputting control signals to the

electronic control valves

2a and 3a provided at 2 and 3 and outputting control signals to the proportional control valve 17 and the first proportional control valve 23. .

At this time, the traveling joining spool which is installed on the upstream side of the flow path 6 of the above-mentioned second hydraulic pump 3 and joins the hydraulic fluid of the second hydraulic pump 3 side with the hydraulic oil of the first hydraulic pump 2 during switching ( 21), the CBP spool 22 provided at the most downstream side of the flow path 6 of the second hydraulic pump 3, and the traveling confluence spool 21 and the CBP spool ( Except for the first proportional control valve 23 that outputs the secondary signal pressure supplied to 22, the configuration is the same as that of the traveling confluence control system shown in FIG. Omitted and duplicated reference numerals are the same.

Hereinafter, a use example of the traveling joining 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.

As shown in FIG. 6, the manipulation amount of the driving pedal 15 may be detected by a current value input directly to the controller 10 when the electric driving pedal 15 is pressed by the driver. This makes the parts 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 input to the controller 10 when the driving pedal 15 is operated, and the proportional control valve 17 is supplied from the controller 10 to be proportional to the operation amount. The configuration except for controlling the traveling spool 5 by outputting a control signal is the same as the configuration of the traveling joining control system shown in FIG. 4, and thus the configuration and detailed description thereof are omitted.

According to the present invention having the above-described configuration, by combining the pump discharge flow rate of the low RPM and low capacity during high-speed running of the wheel type excavator to secure a predetermined running speed, it is possible to reduce the equipment cost cost and improve fuel economy.

Claims

Power generator,

An electronically controlled variable displacement first and second hydraulic pump connected to the power generator;

Hydraulic traveling pedal to output the driving signal pressure in proportion to the operation amount,

A work mode selection switch for selecting a work mode or a driving mode;

A traveling spool installed in the flow path of the first hydraulic pump and controlling the starting, stopping, and direction change 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 change of the work device at the time of switching;

It is installed on the upstream side of the flow path of the second hydraulic pump, the neutral supply the flow rate of the first hydraulic pump downstream of the running spool and the flow rate of the second hydraulic pump to the tandem flow path of the second hydraulic pump, A traveling confluence spool for converting the flow path of the first hydraulic pump into a block state and supplying the hydraulic fluid on the second hydraulic pump side to an upstream side of the traveling spool through the confluence flow path and joining the hydraulic oil of the first hydraulic pump;

A CBP spool which is installed at the downstream side of the flow path of the second hydraulic pump and forms an operating pressure in the tandem flow path of the second hydraulic pump during switching;

A first proportional control valve for supplying secondary signal pressures output in proportion to a control signal from the outside to the traveling confluence valve and the CBP spool, respectively;

The control signal is output to an electronic control valve provided in the first and second hydraulic pumps to control the RPM of the power generator to correspond to the driving signal pressure of the driving pedal, and to control the discharge flow rate of the first and second hydraulic pumps. And a controller configured to output a control signal to the first proportional control valve.
The traveling joining control system of claim 1, further comprising a pressure sensing device that detects a driving signal pressure according to the pressurization of the hydraulic traveling pedal and transmits a detection signal to the controller.
The system of claim 1, further comprising: an RPM sensing device for detecting the RPM of the power generator and transmitting a detection signal to the controller.
According to claim 1, wherein the first and second hydraulic pumps,

And a mechanical variable displacement hydraulic pump for variably controlling the discharge flow rate by a regulator operated by a control signal pressure from the outside.
The control valve according to claim 1, wherein the control valve outputs control signals to the traveling confluence spool and the CBP spool, respectively.

And a solenoid valve for supplying a pilot signal pressure to switch between the driving confluence spool and the CBP spool when the driving mode is selected by operating the work mode selection switch, the control signal being input from the controller. Driving joining control system of construction machinery.
Power generator,

An electronically controlled variable displacement first and second hydraulic pump connected to the power generator;

A hydraulic traveling pedal mechanically connected to an electric control switch for outputting a driving signal current value according to the manipulation amount;

A work mode selection switch for selecting a work mode or a driving mode;

A traveling spool installed in the flow path of the first hydraulic pump and controlling the starting, stopping, and direction change 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 change of the work device at the time of switching;

It is installed on the upstream side of the flow path of the second hydraulic pump, the neutral supply the flow rate of the first hydraulic pump downstream of the running spool and the flow rate of the second hydraulic pump to the tandem flow path of the second hydraulic pump, A traveling confluence spool for converting the flow path of the first hydraulic pump into a block state and supplying the hydraulic fluid on the second hydraulic pump side to an upstream side of the traveling spool through the confluence flow path and joining the hydraulic oil of the first hydraulic pump;

A CBP spool which is installed at the downstream side of the flow path of the second hydraulic pump and forms an operating pressure in the tandem flow path of the second hydraulic pump during switching;

A first proportional control valve for supplying secondary signal pressures output in proportion to a control signal from the outside to the traveling confluence valve and the CBP spool, respectively;

Electronic control provided in the first and second hydraulic pumps to control the RPM of the power generating device and to control the discharge flow rate of the first and second hydraulic pumps to correspond to the current value according to the operation of the electric control switch of the driving pedal. And a controller for outputting a control signal to the valve and for outputting a control signal to the first proportional control valve.
The system of claim 6, further comprising: an RPM sensing device for detecting the RPM of the power generator and transmitting a detection signal to the controller.
The method of claim 6, wherein the first and second hydraulic pumps

And a mechanical variable displacement hydraulic pump for variably controlling the discharge flow rate by a regulator operated by a control signal pressure from the outside.
7. The control valve according to claim 6, wherein the control valve outputs control signals to the traveling confluence spool and the CBP spool, respectively.

And a solenoid valve for supplying a pilot signal pressure to switch between the driving confluence spool and the CBP spool when the driving mode is selected by operating the work mode selection switch, the control signal being input from the controller. Driving joining control system of construction machinery.
Power generator,

An electronically controlled variable displacement first and second hydraulic pump connected to the power generator;

An electric traveling pedal for outputting a driving signal current value in proportion to the manipulated amount;

A work mode selection switch for selecting a work mode or a driving mode;

A traveling spool installed in the flow path of the first hydraulic pump and controlling the starting, stopping, and direction change 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 change of the work device at the time of switching;

It is installed on the upstream side of the flow path of the second hydraulic pump, the neutral supply the flow rate of the first hydraulic pump downstream of the running spool and the flow rate of the second hydraulic pump to the tandem flow path of the second hydraulic pump, A traveling confluence spool for converting the flow path of the first hydraulic pump into a block state and supplying the hydraulic fluid on the second hydraulic pump side to an upstream side of the traveling spool through the confluence flow path and joining the hydraulic oil of the first hydraulic pump;

A CBP spool which is installed at the downstream side of the flow path of the second hydraulic pump and forms an operating pressure in the tandem flow path of the second hydraulic pump during switching;

A first proportional control valve for supplying a secondary signal pressure output in proportion to a control signal from the outside to the traveling confluence spool;

A proportional control valve for supplying the traveling spool with a secondary signal pressure output in proportion to a control signal from the outside;

Control signal to the electronic control valve provided in the first and second hydraulic pump to control the RPM of the power generating device corresponding to the current value according to the operation of the driving pedal, and to control the discharge flow rate of the first and second hydraulic pump And a controller configured to output a control signal to the proportional control valve and the first proportional control valve.
The system of claim 10, further comprising: an RPM sensing device for detecting the RPM of the power generator and transmitting a detection signal to the controller.
The method of claim 10, wherein as the first and second hydraulic pump

And a mechanical variable displacement hydraulic pump for variably controlling the discharge flow rate by a regulator operated by a control signal pressure from the outside.
11. The control valve according to claim 10, wherein the control valve outputs control signals to the traveling confluence spool and the CBP spool, respectively.

And a solenoid valve for supplying a pilot signal pressure to switch between the driving confluence spool and the CBP spool when the driving mode is selected by operating the work mode selection switch, the control signal being input from the controller. Driving joining control system of construction machinery.