KR20090019955A - Control of engine speed and hydraulic pump by an accelerator pedal in wheel excavator - Google Patents

Abstract

A control device the engine RPM and a pump with an accelerating pedal in a wheel excavator is provided to make facilitate work environment to escape from the rough land. A control device the engine RPM and a pump with an accelerating pedal in a wheel excavator comprises a user signal input unit(1) inputting a signal according to need and desiring of an operator; an equipment control(2) operating according to the data set up in advance after receiving the signals input by the user signal input unit; an engine controller(3) controlling the electronics engine RPM to meet a result computed with the equipment control; and an electronic proportional control valve(5) controlling the driving amount of a main pressure pump.

Description

Control of Engine Speed and Hydraulic Pump by an Accelerator Pedal in Wheel Excavator

The present invention relates to an engine speed and a pump control apparatus using an accelerator pedal in a wheel excavator, and more particularly, by detecting a pressure signal output from the accelerator pedal in a wheel excavator equipped with an electronic engine to output the output of the engine and the pump. It is invented to control.

In other words, the equipment controller which senses the pressure of the accelerator pedal detects the user's intention to increase the output in the working mode, and provides the output of the equipment different from the conventional one by controlling the corresponding engine speed or the pump input horsepower. In addition, it is possible to provide convenience to the driver through the output control method that can use the work lever while maintaining the continuity of the job in the situation where the output should be increased during the operation and the output control method that can escape from the worst place in the harsh area. The present invention relates to an engine speed and a pump control device using an accelerator pedal in a wheeled excavator so as to improve work efficiency.

In general, in the case of wheel excavators, it is common to set the output of the engine and the pump differently by dividing the driving time and the working time, and the driving speed is set to change the engine speed by using the accelerator pedal. The output point is fixed and output for working with a fixed engine speed and pump output point.

In addition, when driving, in order to prevent safety accidents, the operation device is divided so that the operation device cannot be operated, and the output control method is different. Normally, the output control at the time of driving and working is "driving mode" and working mode, respectively. I distinguish it.

In addition, such wheel excavators generally provide a fixed output point of the engine speed and pump input horsepower in consideration of fuel efficiency and work efficiency, and in some cases, the user determines the degree of the load of the work in advance. The fixed point of the output can be used with a limited change, and a method of increasing the engine power with the accelerator pedal has been devised by varying the engine speed through the accelerator pedal during driving.

As shown in FIG. 1, the engine speed control apparatus of the conventional wheel excavator receives user signals input through the driving pedal push signal input unit 11, the driving / job selection signal switch 12, and the engine acceleration signal input unit 13, respectively. It is configured to transmit to the equipment controller 2 to the equipment controller 2 to judge, and then to the engine controller 3 which controls the driving of the engine 4 through the result.

Therefore, the equipment controller 2 accepts a user's signal input whether to drive or work, and varies the output of the engine speed according to the engine acceleration signal, and also detects the pressure of the driving pedal to the degree of being pressed. The engine speed is controlled to vary accordingly.

At this time, the rotation speed of the electronic engine 4 is controlled by controller area network (CAN) communication from the equipment controller 2 to the engine controller 3.

However, there is a need to change the output method such that the output of the pump is correspondingly output as well as to change the engine speed while maintaining the continuity of the operation during the wheel excavator operation.

In addition, it is usually limited to provide maximum power when setting the output of the engine and the pump in consideration of fuel economy, which is limited in order to get out of the rough place.

Therefore, there is a need for a method of increasing the output of the engine and the pump by grasping the driver's intention to increase the output of the hydraulic pump as well as the engine speed from the fixed output point during the operation of the wheel excavator.

The present invention has been made in order to solve such a conventional problem, and to change the engine speed and pump horsepower in accordance with the state of the accelerator pedal in the working mode of the wheel excavator as well as to step on the accelerator pedal By varying the engine speed and pump output according to the degree, the user's desired output can be easily changed according to the load of the work, and through this, the continuity of the work can be maintained without removing the operator's hand from the work lever. Wheel excavators that can increase power over existing engines and pump power ranges that are configured to fit the conditions, and also provide pump power as well as maximum engine speed, providing an easy working environment to escape rough terrain. Engine speed and pump control system using accelerator pedal There is a purpose.

In order to achieve the above object, the present invention provides a driver in a mode selection system including a driving pedal push signal input device, an interlocking mode selection input device, a travel / work mode selection switch, and an engine acceleration signal input device and controlled by a preset value. A user signal input unit capable of inputting a desired signal using these as needed; An equipment controller which receives various signals inputted from the user signal input unit and performs arithmetic operation using preset data; An engine controller which receives a result calculated by the equipment controller through a CAN communication line and controls the rotation speed of the electronic engine in response to the result; In the engine speed and pump control apparatus of a wheel excavator consisting of an electronic proportional control valve for controlling the driving amount of the main hydraulic pump in response to the result calculated by the equipment controller,

The equipment controller receives various signals output from the user signal input unit and calculates the engine and the main hydraulic pump output by pressing the accelerator pedal when working in the automatic accelerator pedal interlocking mode, but the user selects the accelerator pedal interlocking signal. If it is input, the pressure of the accelerator pedal is measured quantitatively, and when it detects below a certain pressure, only the engine speed is increased through the engine controller, and the flow rate and pressure flowing into the pump through the electronic proportional control valve are controlled to be constant. When the pressure is exceeded, the pump output is increased. When the engine and pump output are calculated in the rough mode escape mode, when the user inputs a signal indicating the rough spot, the engine speed and the pump flow rate are controlled to be output at maximum. It features.

As described above, according to the present invention, the engine speed and the pump horsepower can be changed variably according to the state of the accelerator pedal in the working mode of the wheel excavator, as well as the engine speed depending on the stepping speed of the accelerator pedal. And the pump output can be varied according to the load of the job according to the zoom, and the user can easily change the desired output, and through this, it is possible to maintain the soft properties of the work without leaving the operator's hand off the work lever, fuel economy conditions It can be used to extend the power of the existing engine and pump power range configured for the purpose of increasing power, and to provide the pump power as well as the maximum engine speed, thereby providing an easy working environment to escape the rough terrain. It is an invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows a schematic block diagram of the device of the present invention, Figure 3 shows a specific block diagram of the device of the present invention, Figure 4 shows a flowchart for explaining the operating state of the device of the present invention, (A) and (b) of FIG. 5 are graphs showing the current value of the engine speed and the electromagnetic proportional control valve according to the pedal pressure in the "automatic accelerator pedal mode", and FIG. It is a graph showing the engine speed according to the pedal pressure and the current value of the electromagnetic proportional control valve in the escape mode.

According to the present invention, the apparatus includes a driving pedal push signal input unit 11, an interlocking mode selection input unit 14, a traveling / work mode selection switch 12, and an engine acceleration signal input unit 13, and is controlled by a preset value. A user signal input unit (1) for allowing a driver to input a desired signal by using them in a mode selection system; An equipment controller 2 which receives various signals input from the user signal input unit 1 and operates arithmetic operations using preset data; An engine controller (3) which receives a result calculated by the equipment controller (2) through a CAN communication line and controls the rotation speed of the electronic engine (4) in response to the result; In the engine speed and pump control apparatus of a wheel excavator composed of an electromagnetic proportional control valve (5) for controlling the driving amount of the main hydraulic pump (6) in response to the result calculated by the equipment controller (2),

The equipment controller 2 receives various signals output from the user signal input unit 1 and calculates the output of the engine 4 and the main hydraulic pump 6 by the push signal of the accelerator pedal when working in the automatic accelerator pedal interlocking mode. However, when the user inputs a signal for selecting the accelerator pedal linkage, the pressure of the accelerator pedal is quantitatively measured, and upon detecting a predetermined pressure or less, only the engine speed is increased through the engine controller 3, and the electronic proportional control valve Through (5), the flow rate and pressure flowing into the main hydraulic pump (6) are controlled to be constant, and when the predetermined pressure is exceeded, the pump output is increased, and the engine (4) and the main hydraulic pump ( 6) If the user inputs a signal indicating that the rough terrain by calculating the output, the engine speed and the pump flow rate is characterized in that the control to output the maximum .

Here, reference numeral 7 denotes a work lever, and 8 denotes a pilot pump installed between the electronic engine 4 and the main hydraulic pump 6 to control the opening / closing amount thereof by the electromagnetic proportional control valve 5. It is an actuator installed between the work lever 7 and the main hydraulic pump 6 to control the hydraulic amount.

Referring to the operation and effect of the device of the present invention configured as described above are as follows.

First, the apparatus of the present invention is a known signal consisting of a user signal input unit 1, equipment controller (2), electronic engine (4), engine controller (3), main hydraulic pump (6) and electromagnetic proportional control valve (5). In the engine speed and pump control device of the wheel excavator, the equipment controller (2) receives the various signals output from the user signal input unit 1 by the push signal of the accelerator pedal when working in the automatic accelerator pedal interlocking mode (4) and the output of the main hydraulic pump (6), but when the user inputs a signal for selecting the accelerator pedal linkage quantitatively measures the amount of pressure pressed by the accelerator pedal, the engine controller (3) Only the engine speed is increased through), and the flow rate and pressure flowing into the main hydraulic pump (6) are controlled to be constant through the electronic proportional control valve (5). The main technique is to control the engine speed and the pump flow rate to the maximum when the user inputs a signal indicating that the user is a rough ground by calculating the engine 4 and the main hydraulic pump 6 output in the rough ground escape mode. It is a component.

On the other hand, in the present invention, the automatic speed pedal interlocking mode that automatically changes the engine speed and the pump output in accordance with the degree of pressing the accelerator pedal input through the engine acceleration signal input unit 13 of the user signal input unit 1 The control of the output to give the maximum output of the equipment to escape from the rough area is called "experimental escape mode".

The present invention having such a configuration allows the engine pedal and the pump input horsepower to be controlled by an accelerator pedal in a wheel type excavator equipped with an electronic engine. The engine speed and the main hydraulic pump 6 of the engine 4 are controlled. Horsepower is achieved through the control of the equipment controller (2).

At this time, the engine speed is controlled by the equipment controller (2) and the engine controller (3) connected by the CAN communication line, the input horsepower of the main hydraulic pump (6) is an electromagnetic proportional control valve set in the equipment controller (2) The flow rate is controlled by swash plate control of the main hydraulic pump 6 by the current output value of (5).

Therefore, the driver of the wheel excavator, which is the user, can determine the fixed engine output set by the user in the conventional work mode (hereinafter referred to as the "normal work mode").

When the outputs of the electronic engine 4 and the main hydraulic pump 6 are to be used variably, the controller 2 gives the input signal of the "automatic accelerator pedal interlocking mode" through the interlocking mode selection input unit 14, and the equipment controller 2 supplies the engine. The controller 3 and the electromagnetic proportional control valve 5 are instructed to vary the output of the engine 4 and the main hydraulic pump 6.

At this time, the minimum speed of the engine is set to the engine speed level determined by the user adjustment dial which is the engine acceleration signal input device 13 in the normal work mode.

In addition, the engine speed can be output to the maximum value by pressing the accelerator pedal from the engine speed set to the lower limit, wherein the pressed degree of the accelerator pedal is sensed by the pressure sensor and transmitted to the equipment controller 2. The controller 2 instructs the engine controller 3 to output a corresponding engine speed.

When the pressure of the accelerator pedal is below a certain value, only the engine speed is variably adjusted. If the pressure of the accelerator pedal is detected above the reference value, the pump output is also increased.

 Accordingly, the engine speed and the pump output may be varied by using the accelerator pedal in a situation where the fixed engine speed and the pump output are used according to the workload, and the output is to be increased.

In addition, in the rough mode escape mode, the engine input as well as the pump input horsepower is controlled to the maximum according to the pressing of the accelerator pedal. (2) provides the maximum output of the engine 4 and the main hydraulic pump 6 the machine can deliver.

Referring to the operation of the present invention in detail with reference to the drawings as follows.

Figure 2 shows a schematic block diagram of the apparatus of the present invention, Figure 3 shows a specific block diagram of the device of the present invention, which is equipped with an equipment controller (2) to control the output of the excavator, the equipment As the input signal of the controller 2, there are input signals such as a push signal of the driving pedal, a pedal linkage selection signal, a driving or work selection signal, and an engine acceleration signal.

The travel or work selection signal selected through the travel / work mode selection switch 12 installed in the user signal input unit 1 transmits the user's selection to the equipment controller 2 whether the equipment is to be used for the work or the travel. Signal, and the pedal linkage signal input by the interlocking mode selection input unit 14 interlocks the pedal during operation to use the automatic pedal interlocking mode provided by the present invention or the rough terrain escape mode. Signal to input to.

In addition, the driving pedal press signal input through the driving pedal push signal input unit 11 is a signal that determines the traveling speed of the excavator and transmits it to the equipment controller (2), the engine input through the engine acceleration signal input unit (13) The acceleration signal is a signal for adjusting the engine speed.

Here, each signal can be configured in various ways such as a switch, a lever, a dial, and the like, and a signal input method similar to the above for the signal input side of the equipment controller 2 or the optimization of the equipment design and the efficient configuration of the signal input. It does not go out of scope.

On the other hand, the contents mentioned as the driving pedal push signal reveals that the accelerator pedal of the wheel excavator.

Here, the rotation speed of the engine 4 is transmitted to the CAN communication line from the equipment controller 2 to the engine controller 3, and the electromagnetic proportional control valve 5 of the main hydraulic pump 6 is connected to the equipment controller 2. Driven and controlled from the current value output, this adjusts the output of the main hydraulic pump 6.

The engine acceleration signal set by the user is transmitted to the equipment controller 2, and the engine speed command value corresponding to the signal is transmitted from the equipment controller 2 to the engine controller 3.

When the user selects the working mode, the equipment controller 2 is basically recognized as the normal working mode, and thus can work according to the fixed engine speed and the fixed pump horsepower set according to the engine acceleration signal input.

If the automatic accelerator pedal interlock mode is selected, the engine speed fixed to the existing engine acceleration signal input is converted to the lowest engine number, and the engine speed can be changed by applying pressure to the accelerator pedal according to the workload.

In the "automatic accelerator pedal interlocking mode" as shown in FIG. 5A, the relationship between the accelerator pedal pressure and the engine speed increases proportionally, and the minimum value of the engine speed is set from the engine acceleration input signal. Value.

In addition, when the pressure of the accelerator pedal is detected about 90 to 95%, the current value of the electromagnetic proportional control valve 5 outputs the minimum value so that the input horsepower of the main hydraulic pump 6 is also increased.

FIG. 6 (a) (b) shows the engine speed according to the accelerator pedal pressure and the current value of the electromagnetic proportional control valve 5 according to the accelerator pedal escape mode. Set the pump output to maximum.

On the other hand, Figure 4 shows a flow chart for explaining the operating state of the apparatus of the present invention having such a configuration, after the power is turned on the equipment controller 2 goes through a process of determining whether the operation mode or driving mode.

As a result, when it is determined that the operation mode, the engine speed and the pump input horsepower is fixedly determined by the engine acceleration signal in the equipment controller 2 as the normal operation mode.

However, when the equipment controller 2 receives the input signal of the automatic driving pedal interlocking mode or the rough terrain escape mode by the user's selection, the engine controller rotates as shown in FIG. It is variable by the number and pump input horsepower, and in the rough mode escape mode, as shown in the graph shown in Fig. 5 (a) (b) to set the engine speed and the current value of the electromagnetic proportional control valve (5) do.

Although the above-described embodiments have been described with respect to the most preferred embodiments of the present invention, it is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications can be made without departing from the technical spirit of the present invention.

1 is a block diagram of an engine speed control apparatus in a conventional wheel excavator;

2 is a schematic block diagram of an apparatus of the present invention.

3 is a detailed block diagram of an apparatus of the present invention.

4 is a flowchart for explaining an operating state of the apparatus of the present invention.

Figure 5 (a) (b) is a graph showing the current value of the engine speed and the electronic proportional control valve according to the pedal pressure in the "automatic accelerator pedal mode."

6 (a) and 6 (b) are graphs showing the current value of the engine speed and the electromagnetic proportional control valve according to the pedal pressure in the “experimental escape mode”;

Explanation of symbols on the main parts of the drawings

1: User signal input unit 2: Equipment controller

3: engine controller 4: engine

5: electromagnetic proportional control valve 6: main hydraulic pump

7: work lever 8: pilot pump

9: Actuator 11: Running Pedal Press Signal Input

12: drive / work mode selection switch 13: engine acceleration signal input unit

14: interlocking mode selection input device

Claims (1)

In the mode selection system controlled by a preset value and equipped with a driving pedal and an interlocking mode selection input device, a driving / working mode selection switch, and an engine acceleration signal inputting device, the user can use the driver to input a desired signal as needed. A signal input unit; An equipment controller which receives various signals inputted from the user signal input unit and performs arithmetic operation using preset data; An engine controller for controlling the rotational speed of the electronic engine in response to a result calculated by the equipment controller; In the engine speed and pump control apparatus of a wheel excavator consisting of an electronic proportional control valve for controlling the driving amount of the main hydraulic pump in response to the result calculated by the equipment controller, The equipment controller receives various signals output from the user signal input unit and calculates the engine and the main hydraulic pump output by pressing the accelerator pedal when working in the automatic accelerator pedal interlocking mode, but the user selects the accelerator pedal interlocking signal. If it is input, the pressure of the accelerator pedal is measured quantitatively, and when it detects below a certain pressure, only the engine speed is increased through the engine controller, and the flow rate and pressure flowing into the pump through the electronic proportional control valve are controlled to be constant. When the pressure is exceeded, the pump output is increased. When the engine and pump output are calculated in the rough mode escape mode, when the user inputs a signal indicating the rough spot, the engine speed and the pump flow rate are controlled to be output at maximum. Engine Rotation using Accelerator Pedal in Wheel Excavator Number and the pump control device.

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