JP2951155B2 - Automatic idle time variable device for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for varying the automatic idle time of a construction machine, and more particularly to a device for varying the automatic idle time of a construction machine which enables a machine operator to change the time for shifting to an automatic idle. It is.

[0002]

2. Description of the Related Art Conventionally, as an engine control mechanism of this type of construction machine, a mechanism is known in which a throttle motor is connected to a control lever provided on an engine body, and the throttle motor is driven to change the number of revolutions of the engine. . The throttle motor is connected to a throttle volume or the like via a controller, converts the rotation of the throttle volume or the like by a mechanical operation into an electric signal via the controller, and drives the throttle motor with the electric signal.

Here, when the mechanical operation has not been performed for a certain period of time, an automatic idle function is activated to change the current engine speed to a prescribed low speed.

[0004]

As described above, in the conventional construction machine, if the non-operation state continues for a certain period of time during use of the machine, the auto idle function is activated to regulate the current engine speed. Is changed to a low rotation speed.
However, due to differences in construction site conditions, operator's work habits, and the like, there are cases in which the prescribed auto-idle transition time during which the auto-idle function operates cannot be satisfied.

In view of the above, a technical problem to be solved in order to improve the workability by making it possible to arbitrarily set the auto-idle transition time and to improve the responsiveness to the conditions of the construction site and the demands of the operator. The present invention aims to solve this problem.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and the number of revolutions of an engine is controlled by a drive signal from a controller, and a non-operation state has been kept for a predetermined time. In a construction machine having an automatic idle function for automatically lowering the engine speed to a specified value, the input means for inputting the time to shift to the automatic idle, the input time display means, and the input time are input by the input means. A means for storing a set time is provided, and a no-operation signal detecting means for detecting the no-operation state is provided. If the time of the no-operation state exceeds the set time, the engine speed is reduced to a specified value. It is an object of the present invention to provide a variable automatic idle time device for a construction machine.

[0007]

When a non-operation state of the machine exceeds a certain period of time, an automatic idle function is activated to change an engine speed from a current speed to a prescribed low speed. The time for shifting to the idle mode is set by the input of the input unit while visually confirming the display of the input time display unit. The set time input by the input means is stored in the storage means in advance.

Thereafter, when the no-operation state of the machine is detected by the no-operation detecting means, a cumulative process of the no-operation state detected by the detecting means is performed. Thus, when the cumulative time exceeds the set time stored by the storage means, the engine speed is changed to a prescribed low speed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. In FIG. 1, 1 is a controller,
The controller 1 includes a CPU 2 and a ROM 3. The ROM 3 stores various computer processing programs, such as data input / output processing, time counting / integration processing, and data comparison / calculation processing.
It is read by U2 and computer processing is executed on CPU2.

First, when the operator changes the auto idle transition time to a desired set time, the operator turns on the reset switch 4. The ON signal is input to the CPU 2 via the input I / F5. The CPU 2 has a ROM 3
The program is read from the CPU and the mode changes to the auto idle transition time setting mode. The CPU 2 reads the current auto-idle transition time stored in the memory 6 and displays the current auto-idle transition time on the display panel 8 via the display I / F 7.

Next, the operator checks the current value of the set auto-idle transition time on the display panel 8 and sets a desired auto-idle transition time by increasing or decreasing the time in units of one second. U of time setting switch 9
Press P or DOWN button. The time setting switch 9
The increase / decrease value due to the pressing is input to the CPU 2 via the input I / F 5 each time the pressing is performed. The CPU 2 calculates the current value and the increase / decrease value previously read from the memory 6, temporarily stores the calculation result in the memory 6, and simultaneously displays the calculation result on the display panel 8 via the display I / F 7.

By repeating the procedure of pressing the UP or DOWN button of the time setting switch 9,
When the desired time has been input, the reset switch 4 is turned on again. The CPU 2 receiving the ON signal via the input I / F 5 stores the calculation result numerical value temporarily stored on the CPU 2, that is, the desired set time in the memory 6, thereby setting the auto idle transition time setting mode. Ends.

A signal from the signal detection switch 10 generated when the machine is not operated is input to the CPU 2 via the input I / F 5. Although a mechanical switch such as a pressure switch is used as the signal detecting means, a sensor or the like may be used instead. When a no-operation signal is input to the CPU 2 from the signal detection switch 10, the program stored in the ROM 3
2, the no-operation signal is counted by the timer 11, the non-operation time is accumulated, and the set time and the accumulated time are constantly compared during the accumulation processing.

If the accumulated time is shorter than the set time, the succeeding accumulation process is performed. If the signal from the signal detection switch 10 is interrupted in the process, the current accumulation in the CPU 2 is performed. The accumulated time until is cleared to zero, and the process returns to the initial state of waiting for the next signal input from the signal detection switch 10. As a result, if the cumulative time exceeds the set time as a result of continuing the above-described cumulative processing, the CPU 2 sends a drive signal of a prescribed low rotational speed to the throttle motor 13 via the drive I / F 12. Is output. By inputting the drive signal, the throttle motor 1
Numeral 3 rotates to a predetermined angle, and operates an engine governor lever 14 connected to a drive shaft of the throttle motor 13 to reduce the rotation of the engine to a prescribed low rotation. Here, the prescribed low rotation does not necessarily mean only the idling rotation, and a constant low-speed operation may be continued.

FIG. 2 shows another embodiment, and the same components as those of FIG. 1 are denoted by the same reference numerals and the description thereof is omitted. The variable resistor 15 is connected to the CPU 2 via an A / D converter 16. The variable resistor 15 is
A time scale proportional to the change in the resistance value is provided. Although the variable resistor is used for setting the auto idle transition time, other hardware may be used.

First, when the operator sets a desired auto idle transition time, the scale of the variable resistor 15 is adjusted to the transition time. A voltage value corresponding to the resistance value of the variable resistor 15 is input to the CPU 2 as an electric signal via the A / D converter 16. The CPU 2
Is executed by the program read from the ROM 3,
2 is converted into a time corresponding to the time scale of the variable resistor 15.

After setting the above-described auto idle transition time,
When a no-operation signal is input to the CPU 2 from the signal detection switch 10, the CPU 2 reads a program stored in the ROM 3, counts the no-operation signal by the timer 11, and performs a process of accumulating the no-operation time. The set time set by the variable resistor 15 and the cumulative time are always compared.

Thus, the cumulative processing of the no-operation signal is continued,
When the cumulative time exceeds the set time, the CPU 2 outputs a drive signal of a prescribed low rotation speed to the throttle motor 13. By inputting the drive signal, the throttle motor 1
Reference numeral 3 rotates to a predetermined angle, and the engine governor lever 14 connected to the drive shaft of the throttle motor 13 operates to change the engine speed to a prescribed low speed.

The processes other than those described above are the same as those described in detail with reference to FIG. 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 one.

[0020]

According to the present invention, as described in detail in the above-described embodiment, the operator can easily set the time for shifting to the auto-idle mode, and therefore, the construction can be performed while improving the fuel efficiency of the engine operation. It is an invention which has various effects, such as contributing to efficiency of work and improvement of workability of an operator.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention in which time setting is performed by software.

FIG. 2 is a block diagram showing an embodiment of the present invention in which time setting is performed by hardware.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Controller 2 CPU 3 ROM 6 Memory 8 Display panel 9 Time setting switch 10 Signal detection switch 13 Throttle motor

Claims (1)

(57) [Claims] 1. An automatic idle function for controlling the engine speed by a drive signal from a controller and automatically lowering the engine speed to a specified value when a non-operation state has passed for a predetermined period of time. In the construction machine, an input means for inputting a time to shift to the auto-idle, an input time display means, and a means for storing a set time input by the input means are provided, and a no-operation signal detection for detecting the no-operation state is provided. An automatic idle time varying device for a construction machine, wherein the engine speed is reduced to a specified value when a period of no operation exceeds the set time.