KR20000021949A - Controller of rotation frequency in engine and method thereof - Google Patents

Abstract

PURPOSE: A controller of rotation frequency of an engine is provided which is easy to establish, maintain and repair, has little disorder problem due to a simple structure, and is enable a control of the rotation frequency of the engine minutely as reducing a fatigue of an operation by pedal of a driver. CONSTITUTION: When a setting up device(34) of a rotation frequency of an engine is positioned at a position for outputting the lowest rotation frequency of the engine, if a user selects a traveling switch(12) to a traveling position, a main controller(11) outputs a displacement of a pedal(15) or a pressure signal to an electronic governor(30) through a communication device(32) to output the rotation frequency of the engine in proportion to the pressure or the displacement of the pedal(15). And then, the electronic governor(30) controls an opening area of a controller of fuel spraying amount to output the rotation frequency of the engine corresponded to the size of the signal. Also, if a user releases a traveling selection switch(12) from a traveling position, the size of the pressure or the displacement of the pedal(15) is not transmitted to the electronic governor(30), the rotation frequency of the engine is controlled by only the setting up device(34) of the rotation frequency of the engine.

Description

Engine speed control device and method

The present invention relates to an apparatus and method for controlling the engine speed, and more particularly, to engine equipment that can be applied to heavy equipment such as excavators and more precisely control the engine speed by using an electronic governor and to simplify the configuration. A water control device and method.

In order to drive the wheel type excavator, as shown in FIG. 1, the pedal 15 is pressed. The opening area of the spool of the control valve 13 for switching the rotational direction of the travel motor 22 increases and decreases in proportion to the displacement of the pedal 15 to change the rotation speed of the engine 17. In this case, due to the complexity of the device, a relatively large reaction force is applied to the pedal 15, which increases the driver's fatigue and has poor driving performance and a sense of operation.

To solve this problem, as shown in the figure, the pressed displacement or pressure of the pedal 15 is detected and input to the main controller 11 and the electric motor 13 is driven to increase the rotation speed of the engine 17. Let's do it. The electric motor 23 controls the rotation speed of the engine 17 by operating the linkage 24 made of a complicated mechanical connection. At the same time, for example, the hydraulic pressure output from the pilot pump 21 such as the gear pump changes the opening area of the spool of the control valve 13 to determine the traveling speed of the travel motor 22. However, in this case, the failure of the complicated linkage 24 structure is easy, the electric motor 23 is required, and the assembly is inconvenient, and precise control of the engine speed becomes difficult. Accordingly, it was difficult to generate engine speed, running speed, and performance desired by the driver.

Accordingly, an object of the present invention is to reduce the driver's pedal operation fatigue and to precisely control the engine speed by improving the linkage and the electric motor of a complicated structure, which is a conventional engine speed control means, and has a simple structure so that there is less trouble. An engine speed control device and method for easy installation and maintenance are provided.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows schematically the engine speed control apparatus which concerns on a prior art.

2 is an explanatory diagram schematically showing an engine speed control apparatus according to a preferred embodiment of the present invention;

3 is a graph showing control characteristics of the engine speed control apparatus according to a preferred embodiment of the present invention.

* Explanation of symbols used in the main part of the drawing

11: main controller

15: Pedal

16: detection means

17: engine

30: electronic governor

32: means of communication

34: engine speed setting device

An engine speed control apparatus according to a preferred embodiment of the present invention for achieving the above object is in the engine speed control apparatus for changing the rotation speed of the engine to the main controller according to the pedal, adjusting the rotation speed of the engine The electronic governor provided in the engine, a detecting means for detecting the operation of the pedal, and a signal to the electronic governor to control the rotational speed of the engine according to the signal input to the main controller after being detected by the detecting means. Characterized in that it comprises a communication means for transmitting the.

A feature of the engine speed control method according to a preferred embodiment of the present invention is an engine speed control method for changing the engine speed to the main controller according to the stepping of the pedal, the step of detecting the stepped displacement or pressure of the pedal Inputting the displacement or pressure signal to the main controller, and transmitting the signal using communication means to operate the electronic governor generally in proportion to the displacement or pressure signal.

2 and 3, an engine speed control apparatus and method according to a preferred embodiment of the present invention will be described in detail.

The engine 17 is provided with an electronic governor 30 for adjusting the rotation speed of the engine 17. In addition, the pedal 15 is provided with a detection means 16 for detecting the operation of the pedal 15. The detecting means 16 may be a position sensor for detecting the stepped displacement of the pedal 15 or a pressure sensor for detecting the pressure at which the pedal 15 is pressed. The communication means 32 is connected between the main controller 11 and the electronic governor 30. Moreover, the engine speed setting device 34 for setting the rotation speed of the engine 17 by arbitrary rotation speeds is provided. The communication means 32 transmits a signal to the electronic governor 30 to control the rotation speed of the engine 17 according to the signal input to the main controller 11 after being detected by the detection means 16. do.

When the travel switch 12 is selected as the travel position and the pedal 15 is depressed, the detection means 16 detects the stepped displacement or pressure of the pedal 15. The main controller 11 receives the displacement or pressure signal and transmits the signal using the communication means 32 to operate the electronic governor 30 generally in proportion to the displacement or pressure signal.

On the other hand, the main controller 11 compares the engine speed set by the engine speed setting device 34 with the engine speed set by the pressed displacement or pressure of the pedal 15. At this time, if the engine speed set by the engine speed setting device 34 is higher than the engine speed set by the pressed displacement or pressure of the pedal 15, the main controller 11 sets the engine speed setting device 34. The engine speed is controlled by the engine speed set by (), and conversely, the engine speed set by the engine speed setting device 34 is lower than the engine speed set by the pressed displacement or pressure of the pedal 15. The main controller 11 controls the engine speed by the engine speed set by the pressed displacement or the pressure of the pedal 15.

For example, when the position of the engine speed setting device 34 is located at a position that outputs the lowest engine speed, selecting the travel switch 12 as the travel position causes the main controller 11 to merely press the pedal 15. The displacement or pressure signal of the pedal 15 is outputted to the electronic governor 30 through the communication means 32 so that the engine speed is output in proportion to the displacement or pressure of () (see FIG. 3). The electronic governor 30 then adjusts the opening area of the device (not shown) for adjusting the fuel injection amount so that the engine speed corresponding to the magnitude of this signal is output. When the travel selection switch 12 is released from the travel position, the displacement of the pedal 15 or the magnitude of the pressure is not transmitted to the electronic governor 30, in which case the control of the engine speed is transmitted to the engine speed setting device 34. Controlled only by In this way, it can be used in combination with a conventional engine speed setting device.

As described above, the engine speed control apparatus and method according to a preferred embodiment of the present invention is easy to assemble and maintain, because the electric motor and the complex linkage structure is removed, precise control of the engine speed by using an electronic governor Is enabled to improve driving performance. In addition, the use of a serial communication line eliminates the need to detect the position of the engine throttle, which may occur when using an electric motor, and simplifies the complicated wiring structure. In addition, since the engine speed is controlled in proportion to the displacement or the pressure of the pedal, the driving performance and the pedal operation feeling are improved.

Claims (5)

In the engine speed control device for changing the engine speed to the main controller in response to the pedal, Electronic governor provided in the engine to adjust the rotational speed of the engine, Detecting means for detecting the operation of the pedal, and And communication means for transmitting a signal to the electronic governor to control the engine speed in accordance with the signal input to the main controller after being detected by the detection means. The engine speed control apparatus according to claim 1, wherein the detection means is a position sensor for detecting a displacement of the pedal. The engine speed control apparatus according to claim 1, wherein the detection means is a pressure sensor for detecting a pressure on which the pedal is pressed. In the engine speed control method for changing the rotational speed of the engine to the main controller in response to the pedal, Detecting the stepped displacement or pressure of the pedal, Inputting the displacement or pressure signal into the main controller, and Transmitting a signal using communication means to actuate the electronic governor generally in proportion to the displacement or pressure signal. The main controller of claim 4, wherein the engine speed is set when the engine speed set by the engine speed setting device for setting the engine speed at an arbitrary speed is higher than the engine speed set by the pressed displacement or pressure of the pedal. The engine speed set by the engine speed setting device to control the engine speed by the engine speed set by the number setting device, and to control the engine speed by the engine speed set by the pressed displacement or the pressure of the pedal if low. And comparing the engine speed with the engine speed set by the pressed displacement or pressure of the pedal.