JPH0674757B2 - Industrial vehicle engine speed controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine speed control device for an industrial vehicle such as a hydraulic shovel, and more specifically, it simplifies the operation to improve fuel consumption, and at the same time, enables a very low speed operation. The present invention relates to a possible engine speed control device.

(Prior Art) Industrial vehicles such as hydraulic shovels have a diesel engine as a power source for vehicle movement and hydraulic pressure generation. In such an industrial vehicle, its usage is limited,
The throttle of the engine is controlled by an actuator that operates with an electric signal.

This will be described with reference to FIG. 2. The electric position setter 1 has an electric resistance 2 built-in, and the electric resistance value is changed by the knob 3 from a high speed rotation speed setting position H to a low speed rotation speed setting position L. It has become a thing. The output signal of the electric position setter 1 is given to the amplifier 5 via the wiring 4, and the amplified signal is given to the actuator 6. The actuator 6 operates the throttle 7 to change the amount of fuel injected into the engine 8.

The operation of the above conventional industrial vehicle is as follows.

When moving the vehicle, the knob 3 is operated to an appropriate rotation speed setting position (usually set to the high-speed rotation speed setting position H), and the engine 8 is driven at the setting rotation speed to move the vehicle to the work site. Let

Next, until the work preparation is completed, the knob 3 is returned to the low-speed rotation setting position L. By doing so, the amount of fuel consumed by the engine 8 is reduced.

Then, when the work preparation is completed, the knob 3 is rotated to the setting position H of the high speed rotation, the engine 8 is rotated at a high speed, the required hydraulic pressure is obtained, and the earth and sand are loaded / unloaded by an attachment such as a shovel, and the work such as excavation is performed. Do it fast.

When work such as loading and unloading of earth and sand is completed, it is necessary to clean up around the work site.However, when performing such work, the attachment such as a shovel is operated at a very low speed to perform it accurately. It is necessary. Therefore, the knob 3 is reset to a predetermined low-speed rotation speed to perform the fine speed work.

On the other hand, an automatic idle switching device as shown in FIG. 3 is also known. This will be described with reference to FIG. 3. The fuel injection pump 22 of the engine 21 of the industrial vehicle is the throttle lever 23 and the switching device 2
4. The output is controlled via the fuel injection control device 25.
The switching device 24 is switched and controlled by the control device 27 that operates by detecting ON / OFF of the operation lever 26 so as to select either the output signal of the throttle lever 23 or the output signal of the low speed rotation command device 28.

Its action is as follows.

Throttle lever when operating lever 26 is on
The output signal of 23 is given to the fuel injection control device 25, and the engine 21 is controlled to the rotation speed according to the operation amount of the throttle lever 23.

When the operating lever 26 is turned off, the control device 27 switches the switching device 24, the output signal of the low speed rotation command device 28 is given to the fuel injection control device 25, and the engine 21 rotates at low speed (idle rotation).

(Problems to be Solved by the Invention) In the conventional industrial vehicle shown in FIG. 2, since the operation of the knob 3 is not a one-touch operation, the driver operates the engine 8 at high speed until the work preparation is completed. I often wait until the end.

In addition, when the work such as loading and unloading of earth and sand is completed and the work site is cleaned up, attachments such as shovels must be operated at a very low speed to perform accurately. When performing the operation, since the operation of the knob 3 is not a one-touch operation, it is often the case that the engine 8 remains at the high speed rotation and the work is performed without rotating the knob 3 to the low speed rotation of the engine 8.

For this reason, the conventional control device shown in FIG. 2 has a drawback that it wastes a large amount of fuel unnecessarily and at the same time prevents the work from being performed accurately.

On the other hand, in the known control device shown in FIG.
When is turned off, the driver automatically switches to idle operation regardless of the driver's intention, which may give the driver a discomfort and hinder safe driving or safe work.

Further, as described above, in industrial vehicles, after carrying out work such as loading and unloading of earth and sand at high speed, it is common to clean up the surroundings by light speed work, but in the device of FIG.
Since an attachment such as a shovel is activated only when is turned on, the throttle lever 23 must be adjusted to perform a slow work. However, it is often troublesome for the driver to operate the knob 3 by turning it, and the driver often performs a work that should be performed at a very low speed while keeping the high speed rotation. Therefore, the cleanup work could not be performed accurately.

Therefore, an object of the present invention is to improve the above-mentioned drawbacks and to enable the engine to rotate at a predetermined low speed by one-touch operation, thereby preventing waste of fuel, and at the same time, enabling fine speed work by one-touch operation. An object is to provide a vehicle engine speed control device.

(Means for Solving the Problems) The present invention adopts the following configuration in order to improve the above-mentioned drawbacks.

That is, in the engine speed control device for an industrial vehicle, which comprises an actuator that operates the throttle of the engine, and an electric position setter that gives an electric signal to the actuator to control the rotation of the engine from a high speed to a low speed range, In addition to the electric position setter, an electric low speed revolution setter capable of variably setting to a predetermined low speed revolution is provided, and either the output circuit of the electric position setter or the electric low speed revolution setter is provided. Is provided with a changeover switch for selecting with one touch, and the signal given to the actuator by the changeover switch is selected to be either the output of the electric position setting device or the output of the electric low speed revolution setting device. It will be.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

The electric position setter 11 has a built-in electric resistance 12, and a knob 13 changes the electric resistance value from a high speed rotational speed setting position H to a low speed rotational speed setting position L. The output signal of the electric position setter 11 is given to the amplifier 15 via the wiring 14, and the amplified signal is supplied to the actuator 16
Given to. Actuator 16 activates throttle 17 to change the amount of fuel injected into engine 18.

The above is the same as the conventional rotation speed control device shown in FIG. 2, but the present invention adds the following configuration to the above-mentioned known control device.

That is, in addition to the electric position setter 11, an electric low speed revolution setter 19 capable of variably setting to a predetermined low speed revolution is provided, and the switching position switch 20 provided in the wiring 14 provides an electric position setter in a one-touch operation. It is possible to select either 11 or the electric low speed revolution setting device 19.

The output signal of the electrical low speed revolution setting device 19 activates the actuator 16 to set the throttle 17 at a low revolution speed.

Further, the switching switch 20 is a switch that can be operated by one-touch, and unlike the knob 13 provided in the conventional electric position setter 11, the operation is simple and the driver can operate without trouble. It is a thing.

Here, the term "one-touch" does not mean a structure that requires continuous operation such as rotating a knob as in the past, but can be performed by pressing once such as a button or tilt switch, or by tilting it. It is a switch that can be either one, and here it is a switch that can be switched to either an electric position setter or an electric low speed rotation speed setter with a single touch operation. is there.

The operation of the present invention configured as described above will be described below.

When the vehicle moves, the switching switch 20 is connected so that the signal from the electric position setter 11 is given to the actuator 16, and the knob 13 is operated to set an appropriate rotational speed setting position (normally, a high speed rotational speed setting is performed). The position H is set) and the engine 18 is driven at the set rotation speed to move the vehicle to the work site.

Next, switch the switch until work preparation is completed.
Actuating 20 causes actuator 16 to communicate with electrical low speed rpm setter 19. By doing this, the engine 18
Is the rotation speed set by the electric low speed rotation speed setting device 19 in one touch, and reduces the amount of fuel consumed by the engine 18.

Then, when the work preparation is completed, the switching switch 20 is operated and the actuator 16 is contacted to the electric position setter 11 by one touch. The electrical position setter 11 is a knob
13 is the set position H of the high speed and the engine 18
Returns to high-speed rotation and obtains the required hydraulic pressure to carry out work such as loading and unloading soil.

Then, when the work of loading and unloading the earth and sand is completed, it is necessary to clean up the surroundings by a slow speed work, but at this time, the changeover switch 20 is operated to move the actuator 16 to the electrical low speed revolution setting device 19 with one touch. Let me know.
Then, an attachment such as a shovel accurately cleans up the surrounding area at a low speed. In this case, if the electric low-speed rotation setting device 19 is set to a predetermined low-speed rotation in advance, the work can be performed at a desired speed at a very low speed, so that the work can be performed easily and accurately.

(Effects of the Invention) According to the present invention, the following effects are achieved.

Since the low speed rotation of the engine can be obtained with one touch, the operator can change the engine rotation without trouble, and the fuel consumption of the engine during work standby can be reduced.

Since the engine can be operated at a predetermined low-speed rotation speed with one touch, the work can be performed at a very low speed easily, and the post-treatment after the work of loading and unloading earth and sand can be performed accurately.

Further, the present invention can be easily added to the conventional device and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an engine control system diagram showing an embodiment of the present invention,
FIG. 2 is a conventional engine control system diagram, and FIG. 3 is another conventionally known engine control system diagram. 11: electric position setter, 12: resistance, 13: knob, 14: wiring, 16: actuator, 17: throttle, 18: engine, 19: electric low speed rpm setter, 20: switch switch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiji Ogawa 1 731 Naganuma-cho, Chiba-shi, Chiba Sumitomo Heavy Industries, Ltd. Chiba Works (72) Inventor Keiji Yoshida 1 731 Naganuma-cho, Chiba-shi 1 Sumitomo (56) Reference JP-A-57-195839 (JP, A) JP-A-59-231155 (JP, A) JP-A-56-160225 (JP, A) Actual development Sho-59 -96336 (JP, U)

Claims (1)

[Claims] 1. An engine speed control device for an industrial vehicle comprising an actuator for operating a throttle of an engine, and an electric position setter for giving an electric signal to the actuator to control the rotation of the engine in a range from high speed to low speed. In the above, in addition to the electric position setting device, an electric low speed rotating speed setting device capable of variably setting a predetermined low speed rotating speed is provided, and an output circuit of the electric position setting device or the electric low speed rotating speed setting device A changeover switch for selecting either one with one touch is provided, and the signal given to the actuator by the changeover switch is either the output of the electric position setting device or the output of the electric low speed revolution setting device. An engine speed control device for an industrial vehicle, which is characterized by being selected.