JPH0826795B2 - How to set engine output mode of tracked vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine output mode setting method for a tracked vehicle, such as a bulldozer, which has a working machine for at least dozing work and ripping work.

(Prior Art) Conventionally, regarding this type of engine output mode setting method,
The engine output mode for performing the dosing work adapted to the dosing work and the engine output mode for performing the ripping work adapted to the ripping work are switched by an operator operation, for example, on a control panel or the like, which is separate from the work lever such as the ripping river. I am doing that.

(Problems to be Solved by the Invention) However, in the above-described engine, particularly in the first forward speed stage where the dosing work and the ripping work are performed, the engine output mode for performing the dosing work and the engine for performing the ripping work There is a problem in that the operation of switching to the output mode is forgotten, and especially when the ripping work is performed in the engine output mode in which the dozing work is performed, slip increases and wear of the crawler belt is severe.

The present invention has an object of solving such a problem, and an engine output mode for performing a dosing work without forgetting a switching operation between an engine output mode for performing a dosing work and an engine output mode for performing a ripping work. An object is to provide an engine output mode setting method for a tracked vehicle in which ripping work is not performed.

(Means and Actions for Solving Problems) In order to achieve the above-mentioned object, an engine output mode setting method for a tracked vehicle according to the present invention is provided with at least a working machine for dozing work and ripping work. In the method of setting the engine output mode of a tracked vehicle, the engine output mode that basically performs the dosing work at the first forward speed is automatically set, and when the ripper lever is operated at this first forward speed, the dosing work is performed. The engine output mode for performing the ripping work is switched to the engine output mode for performing the ripping work, and the engine output mode for performing the ripping work is automatically set.

According to the present invention, in the first forward speed stage in which both dosing work and ripping work are performed, basically, the engine output mode for performing the dosing work adapted to the dosing work is automatically set, but the ripper lever is During the operated ripping work, the engine output mode for performing the ripping work is automatically set by switching from the engine output mode for performing the dozing work.

Therefore, the switching operation between the engine output mode for performing the dosing work and the engine output mode for performing the ripping work is not forgotten, and the ripping work is not performed in the engine output mode for performing the dosing work to prevent the track from wearing. can do.

(Example) Next, a specific example of the engine output mode setting method for a tracked vehicle according to the present invention will be described with reference to the drawings.

The working mode of the bulldozer and the mode of generation of shoeslip differ between ripping, which causes hard rocks and soft rocks to rupture, and dosing, which pushes earth and sand and crushed stones. Generally, in the case of ripping work, shoe slip occurs rapidly, and in the case of dosing work, shoe slip occurs gently. Therefore, when a shoe slip occurs that exceeds the shoe slip ratio, which is the optimum shoe slip ratio for a tracked vehicle, in the case of ripping work, the deselvedal is first depressed to reduce the engine output, and then the work machine for ripping work. Is operated to reduce the load and at the same time restore the throttled engine output.
Further, in the case of dozing work, since the shoe slip is gentle, the load is first reduced to try to prevent the shoe slip, and the deceleration pedal is depressed when the shoe slip is still not suppressed.

As described above, in order to obtain the engine output mode adapted to various kinds of work operation, the soil performance to be worked is compared with the full performance curve in the traction-speed diagram of the engine as shown in FIG. Alternatively, the engine output state, in which the high output portion is cut off, is provided according to the rock quality, so-called basic mode is provided. Further, when the specific shoe slip ratio is exceeded in the basic mode, a state in which the engine output is cut off in order to return this value to the set value, that is, a so-called control mode is provided. In FIG. 1, if the traction force at the origin in the basic mode is Fo and the speed is Vo, the control mode for lowering the shoe slip ratio above the predetermined value in the basic mode corresponds to the origin. The traction force is Fc (speed is Vo).

For the work during operation, the corresponding engine output mode is divided into dosing A, ripping B at 1st speed, ripping C at 2nd speed or 3rd speed, and reverse D, and the control methods are defined as follows.

A: It is an output mode having only the basic mode shown in the traction force-velocity diagram shown in FIG.

B: An output mode having both the basic mode and the control mode shown in the traction-velocity diagram shown in FIG.
When the shoe slip ratio has a value indicating the optimum traction force, the engine output is controlled according to the basic mode. Further, when the shoe slip ratio exceeds a predetermined value, work operation is performed in a control mode in which the engine output is cut off, and when the shoe slip returns to a predetermined value, control is performed to return to the basic mode.

C: The engine output is a full command output corresponding to the main control lever, and when there is an operator's deceleration operation or throttle command, the engine output mode is set to the corresponding one while giving priority to the manual.

D: In order to make the reverse vehicle speed lower than the forward speed, issue a partial command to reduce the engine output, and set the output mode in accordance with this partial command.

Then, as shown in FIG. 2 or FIG. 3, such a control method is applied corresponding to each rate-determining step in the working mode of the bulldozer, and when the speed lever is shifted to the first forward speed, the engine output mode is changed to dosing. The mode is set, and it is possible to shift to the ripping mode as it is by operating the ripper lever. In addition, ripping and reversing in forward second speed or third speed can be similarly covered, and it becomes possible to set an adaptive engine output for controlling shoe slip in a certain work mode.

[Brief description of drawings]

1 to 3 are for explaining a specific embodiment of the engine output mode setting method for a tracked vehicle according to the present invention. FIG. 1 is a traction force-speed diagram, and FIG. FIG. 3 and FIG. 3 are explanatory views exemplifying the division of the control method in relation to the working mode of the bulldozer and the rate-determining step of the speed-step lever.

Claims (1)

[Claims] 1. A method for setting an engine output mode of a tracked vehicle having at least a working machine for dosing work and a ripping work, wherein an engine output mode for basically performing the dosing work is automatically set at the first forward speed stage. When the ripper lever is operated at the first forward speed, the engine output mode for performing the dopping work is switched to the engine output mode for performing the ripping work, and the engine output mode for performing the ripping work is automatically set. A method for setting the engine output mode of a tracked vehicle.