JP2001123859A - Operation mode selecting device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change over an operation mode without providing mode selection switch in a construction machine selecting and executing two different operation modes. SOLUTION: Turning-on/off of an idle control switch 19 and the turning-on/off of pressure switches 14, 15 are detected by a controller 30. When the idle control switch 19 is in an on state beyond a prescribed time, an actuator 18 is controlled by changing over form a 'single-touch-operation idle' mode or 'auto-idle' mode selected then to another operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine operation mode selection device, and more particularly to a construction machine operation mode selection device for selecting and executing one of a plurality of operation modes when controlling an actuator. It is about.

[0002]

2. Description of the Related Art A conventional operation mode selecting device for a construction machine of this type will be described with reference to FIGS. FIG. 3 shows a control circuit of a hydraulic shovel as an example of a construction machine, and booms and booms are provided in oil passages of a first hydraulic pump 1 and a second hydraulic pump 2.
Control valves 3 to 3 for actuators such as arm and bucket cylinders, swing motors and travel motors
10 are provided, and each of the control valves 3 to 10 is provided.
Is in the neutral position, the pilot oil passages 11 and 12 communicate with the tank 13, and when any of the control valves 3 to 10 is switched, the pilot oil passage 11 or 12 is shut off and the pressure switch 14 or 15 is turned on. The pressure switch 14,
15 ON / OFF signals are sent to the controller 30.

[0003] The first and second hydraulic pumps 1 and 2 and the pilot pump 16 are driven by an engine 17. The engine 17 adjusts the fuel injection amount and fuel injection timing by an actuator 18 for governor control. By operating the actuator 18 in response to the command signal, the rotational speed of the engine 17 can be arbitrarily increased or decreased from the idling state to the working state. Reference numeral 19 denotes a momentary idle control switch. The on / off signal of the idle control switch 19 is transmitted to the controller 30.
Sent to

Here, reference numeral 20 denotes a mode selection switch for selecting one of a "one-touch idle" mode and an "auto idle" mode, which will be described later. When the mode selection switch 20 is off, the “one touch idle” mode is selected, and when the mode selection switch 20 is on, the “auto idle” mode is selected. An on / off signal of the mode selection switch 20 is sent to the controller 30. Reference numeral 21 denotes a lamp. As shown in FIG.
Is off and the "one-touch idle" mode is selected, and goes off when the mode selection switch 20 is on and the "auto idle" mode is selected. Incidentally, 22 is a battery.

When the hydraulic excavator is in a working state, the engine 17 is driven at a high rotational speed by a command signal from the controller 30 to the actuator 18. For example, when the operator turns on the idle control switch 19 manually while waiting for a dump or the like, the ON signal is sent to the controller 3.
0 receives the signal and sends an idle signal to the actuator 18. Accordingly, the number of revolutions of the engine 17 is reduced and idling is performed, and the fuel consumption is reduced to save energy.
When the idle control switch 19 is turned on again, the idle signal from the controller 30 to the actuator 18 is released, and the engine 17 returns to a high rotation speed. Such a control mode is referred to as a “one-touch idle” mode.

On the other hand, when one of the control valves 3 to 10 is switched from the neutral position to another position by the operation of the operator, the pilot oil passage 11 or 1
2 is shut off and the pressure switch 14 or 15 is turned on. When the pressure switch 14 or 15 is on, the controller 30 determines that it is in a work state, and when the pressure switch 14 or 15 is off, it determines that it is in a work waiting state. When there is no ON signal of the pressure switch 14 or 15, the controller 30 sends the actuator 18
The idle signal is sent to the engine 17 to idle the engine 17 to save energy. When an ON signal of the pressure switch 14 or 15 is received, the idle signal from the controller 30 to the actuator 18 is released, and the engine 17 returns to a high rotation speed. Such a control mode is called an "auto idle" mode.

The operator operates the mode selection switch 20
To select one of the operation modes, and turn on or off the lamp 21 in accordance with the selected mode, thereby displaying to the operator which control mode is being executed.

[0008]

As described above, the "one-touch idle" mode in which the actuator 18 is controlled by turning on and off the idle control switch 19 manually is set as the first operation mode, and the pressure switches 14 and 15 are controlled. If the "auto-idle" mode in which the on / off signal is detected and the actuator 16 is controlled is set as the second operation mode, the first operation mode and the second operation mode are selected according to the operator's preference. Once a mode is selected by the switch 20, the mode selection switch 20 is hardly switched unless another operator replaces it. Therefore,
The time and labor for parts and wiring related to the mode selection switch 20 are wasted, which contributes to an increase in cost.

Therefore, in a construction machine that selects and executes two different operation modes, there arises a technical problem to be solved in order to enable switching between operation modes without providing a mode selection switch. Therefore, an object of the present invention is to solve this problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and has one of a first operation mode for controlling an actuator and a second operation mode for controlling an actuator. In a construction machine to be selected and executed, the construction machine includes means for detecting on / off of the operation switch, and means for measuring an on time of the operation switch. Another object of the present invention is to provide a construction machine operation mode selection device configured to control the actuator by switching from one of the operation modes selected at that time to the other operation mode.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of explanation, the same components as those of the prior art are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 shows a control circuit of a hydraulic shovel as an example of a construction machine. Control valves 3 to 10 are provided in oil passages of first and second hydraulic pumps 1 and 2 driven by an engine 17. I have.

As in the prior art, in the "one-touch idle" mode, which is the first operation mode, the actuator 18 is controlled by manually turning on and off the idle control switch 19 as the operation switch, and the second operation mode is set. In the "auto idle" mode, the actuator 16 is controlled by detecting on / off signals of the pressure switches 14 and 15 as sensors. Further, a controller 30 is provided as means for detecting ON / OFF of the operation switch and means for measuring the ON time of the operation switch.

FIG. 2 is a flowchart of a calculation process executed by the controller 30 at a certain sampling time. The control procedure of the present invention will be described with reference to FIGS. The initial value of the operation mode is "One Touch Idle"
Mode, and the initial value of FLAG is set to “0”. When the idle control switch 19 is on (Step 1), the idle control switch 1
The ON time of No. 9 is measured, and it is determined whether FLAG is “0” or “1” (Step 2). FLAG is "0"
, The idle control switch 19
It is determined whether or not the ON time has elapsed for a predetermined time (t seconds) (Step 3). If the on-time exceeds a predetermined time (t seconds), the operation mode selected at that time is determined (Step 4).

In Step 4, if the "one-touch idle" mode is selected at this time, the mode is switched from this mode to the "auto idle" mode (Step 5).
After that, FLAG is set to "1" (Step 6). On the other hand, if the "auto idle" mode is selected at this time, the mode is switched from this mode to the "one touch idle" mode (Step 7), and thereafter, the FLAG is set to "1" (Step 6). . Then, after switching to the "auto-idle" mode, the lamp 21 is turned on, and after switching to the "one-touch idle" mode, the lamp 21 is turned off.

On the other hand, when the idle control switch 19 is off in Step 1, FLAG is set to "0" (Step 8), and control is continued at the next sampling. Also, when FLAG is "1" in Step 2 and when the on-time is less than or equal to a predetermined time (t seconds) in Step 3, control is continued at the next sampling.

That is, in the "one-touch idle" mode, if the idle control switch 19 is turned on for a predetermined time (t seconds) or less, the "one-touch idle" is established.
The mode is continued, an idle signal is sent from the controller 30 to the actuator 18, the rotation speed of the engine 17 decreases, the engine 17 starts idling, and if the idle control switch 19 is turned on again for a predetermined time (t seconds) or less, The idle signal from the controller 30 to the actuator 18 is released, and the engine 17 returns to a high rotation speed.

On the other hand, in the "one-touch idle" mode, the idle control switch 19
Is turned on for more than a predetermined time (t seconds), the mode is switched from the “one-touch idle” mode to the “auto idle” mode. If so, the pressure switches 14 and 15
The work state is determined by turning on and off the motor. When the work state is not reached, the controller 30 sends an idle signal to the actuator 18 to lower the engine 17 to idling rotation. The engine 17 is released, and the engine 17 returns to the high rotation speed.

If the idle control switch 19 is turned on for more than a predetermined time (t seconds) in the "auto idle" mode, the "auto idle"
The mode switches to the “one-touch idle” mode.

In this embodiment, the first operation mode is set to the "one-touch idle" mode, and the second operation mode is set to the "auto-idle" mode. It should not be limited to idle control of, for example, a selection device for a "high speed traveling" mode and a "low speed traveling" mode,
The present invention can be applied to other operation mode selecting devices such as a device for selecting a mode and a "low-speed operation" mode.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0021]

According to the present invention, as described in detail in the above embodiment, a first operation mode for controlling an actuator,
In a construction machine having a second operation mode for controlling an actuator, the on / off of the operation switch is detected and the on time is measured, and when the operation switch is on for more than a predetermined time, Since the actuator is controlled by switching from one operation mode to the other operation mode, a mode selection switch, which is conventionally required, becomes unnecessary. Therefore, the number of parts is reduced, and labor for wiring and the like is omitted, and cost can be reduced. In addition, since a plurality of operation modes can be selected with a single operation switch, the present invention has various effects, such as improved operability.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a control circuit diagram of a hydraulic shovel.

FIG. 2 is a flowchart of an arithmetic processing according to the embodiment of the present invention.

FIG. 3 is a control circuit diagram of a conventional hydraulic shovel.

FIG. 4 is a timing chart showing on / off states of a mode selection switch and a lamp in each operation mode.

[Explanation of symbols]

 14, 15 Pressure switch 17 Engine 18 Actuator 19 Idle control switch

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2D003 AA01 AB06 BA01 BB12 CA04 DB07 3G084 AA01 AA07 BA13 BA15 CA03 EA07 EA11 FA00 3G093 AA10 AA15 AB01 CA04 DB00 DB07 DB23 EA00 EA05 EC01 FA11 FA12

Claims (1)

[Claims] 1. A construction machine for selecting and executing one of a first operation mode for controlling an actuator and a second operation mode for controlling an actuator, and means for detecting on / off of the operation switch. Means for measuring the on-time of the operation switch, and when the operation switch is on for more than a predetermined time, switches from one operation mode selected at that time to the other operation mode. An operation mode selection device for a construction machine, wherein the operation mode selection device is configured to control the actuator.