JPH0711985A - Auto idle time varying device for construction machine - Google Patents

Abstract

PURPOSE:To improve workability by a method wherein a time at which transfer to auto idle desired by an operator is effected is displayed, the time is inputted and stored as the display is confirmed, the non-operation state of a construction machine is accumulated and processed, and when an accumulated value exceeds a set value, the number of revolutions of an engine is decreased. CONSTITUTION:When a reset switch 4 is turned ON, an ON-signal is inputted to a controller 1, the program of an ROM 3 is read by a CPU 2 to set an auto idle transfer time. Data of a memory 6 is read thereby and an auto idle transfer time is displayed on a display panel 8. In which case, when a time set switch 9 is caused to effect UP and DOWN operation as display is confirmed, a present value and an adjusted value are computed by the CPU 2 and a result is displayed on the display panel 8. Meanwhile, a non-operation signal from a detecting switch 10 is counted by means of a timer 11 to measure an accumulated time. When the accumulated time exceeds a set time, a drive signal to a throttle motor 13 is outputted, and the number of revolutions of an engine is reduced to a specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic idle time varying device for a construction machine, and more particularly to a variable automatic idling time device for a construction machine which enables a machine operator to change the time for shifting to automatic idle. 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 in 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 rotation of the throttle volume or the like by mechanical operation into an electric signal via the controller, and drives the throttle motor by the electric signal.

Here, when the mechanical operation is not performed for a certain period of time, the auto idle function operates to change the current engine speed to a specified low engine speed.

[0004]

As described above, in the conventional construction machine, if the non-operation state continues for a certain period of time while the machine is in use, the auto idle function operates to define the current engine speed. It has been changed to a low rpm.
However, due to the situation of the construction site, the work habits of the operator, and the like, there are cases where the prescribed auto idle transition time at which the auto idle function operates cannot be satisfied.

Therefore, the technical problem to be solved in order to improve the workability by improving the adaptability to the situation at the construction site and the demands of the operator by allowing the automatic idle transition time to be set arbitrarily. Therefore, the present invention aims to solve this problem.

[0006]

The present invention has been proposed in order to achieve the above-mentioned object, and controls the engine speed by a drive signal from a controller, and the non-operation state has passed a certain time. In the construction machine having an auto idle function for automatically reducing the engine speed to a specified value, the input means for inputting the time to shift to the auto idle, the input time display means, and the input means are used. A means for storing the set time is provided, and a non-operation signal detecting means for detecting the non-operation state is provided. When the time in the non-operation state exceeds the set time, the engine speed is reduced to a specified value. An automatic idle time varying device for a construction machine is provided.

[0007]

When the machine is not operated for a certain period of time, the auto idle function is activated to change the engine speed from the current engine speed to the specified low engine speed. The time to shift to the idle is set by inputting the input means while visually checking the display of the input time display means. The set time input by the input means is stored in the storage means in advance.

After that, when the non-operation state of the machine is detected by the non-operation detecting means, the cumulative processing of the non-operation state detected by the detecting means is performed. Then, when the cumulative time exceeds the set time stored by the storage means, the engine speed is changed to a specified low speed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. In FIG. 1, 1 is a controller,
The controller 1 is provided with a CPU 2 and a ROM 3. The ROM 3 stores various computer processing programs such as data input / output processing, time counting / accumulation 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 shift time to a desired set time, the reset switch 4 is turned on. The ON signal is input to the CPU 2 via the input I / F 5. The CPU 2 has a ROM 3
The program is loaded from and it becomes the auto idle transition time setting mode. The CPU 2 reads the current auto idle shift time stored in the memory 6 and displays the auto idle shift time on the display panel 8 via the display I / F 7.

Next, the operator confirms the present value of the set auto idle shift time on the display of the display panel 8 and sets the desired auto idle shift time by increasing or decreasing the time in units of 1 second. U of time setting switch 9
Press the P or DOWN button. The time setting switch 9
The increase / decrease value by 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 to which the ON signal is input 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, to thereby set 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 described above, the program stored in the ROM 3 is executed by the CPU.
2 reads and counts the no-operation signal with the timer 11 to perform a cumulative processing of the no-operation time, and during the cumulative processing, the set time and the cumulative time are constantly compared.

When the cumulative time is shorter than the set time, the cumulative cumulative processing is carried over. When the signal from the signal detecting switch 10 is cut off in the process, the current CPU 2 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. Thus, as a result of continuing the above-mentioned cumulative processing, when the cumulative time exceeds the set time, the CPU 2 sends the drive signal of the specified low rotation speed to the throttle motor 13 via the drive I / F 12. Is output. By inputting the drive signal, the throttle motor 1
3 rotates to a predetermined angle and operates the engine governor lever 14 connected to the drive shaft of the throttle motor 13 to bring the engine to a specified low speed. Here, the specified low rotation does not necessarily mean only idling rotation, but a constant low speed operation may be continued.

FIG. 2 shows another embodiment, and the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The variable resistor 15 is connected to the CPU 2 via the A / D converter 16. The variable resistor 15 is
There is a time scale proportional to the change in resistance. 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. The 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. CPU2
Is the CPU according to the program read from the ROM3.
The electric signal input to 2 is converted into a time corresponding to the time scale of the variable resistor 15.

After setting the auto idle shift time,
When a no-operation signal is input to the CPU 2 from the signal detection switch 10, the CPU 2 reads the program stored in the ROM 3, counts the no-operation signal with the timer 11, and accumulates the no-operation time. , The set time set by the variable resistor 15 and the cumulative time are constantly compared.

Thus, the cumulative processing of no-operation signals is continued,
When the cumulative time exceeds the set time, the CPU 2 outputs a specified low rotation speed drive signal to the throttle motor 13. By inputting the drive signal, the throttle motor 1
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 rotational speed of the engine to a specified low rotational speed.

The processing other than that described above is the same as that described in detail with reference to FIG. The present invention can be modified in various ways without departing from the spirit of the present invention.
And, it goes without saying that the present invention extends to the modified one.

[0020]

As described in detail in the above-mentioned embodiment, the present invention enables the operator to easily set the time for shifting to the auto idle, so that the construction can be carried out while the economy of fuel consumption for engine operation is achieved. It is an invention that exhibits various kinds of effects such as contributing to efficiency improvement of work and improvement of workability of an operator.

[Brief description of drawings]

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

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

[Explanation 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)

[Claims] 1. An auto 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 time. The construction machine is provided with an input means for inputting the time to shift to the automatic idle, an input time display means, and a means for storing the set time input by the input means, and a no-operation signal detection for detecting the no-operation state. An automatic idle time varying device for a construction machine, characterized in that a means is provided to reduce the engine speed to a specified value when the non-operation state time exceeds the set time.