KR200244736Y1 - Pump and engine speed control device of hydraulic drive vehicle - Google Patents

Abstract

The present invention relates to a pump and an engine speed control device for a hydraulic drive vehicle, and more particularly, an engine, a hydraulic pump driven by the engine to operate a plurality of actuators, and a driving and working state detection means. In the pump and engine speed control apparatus of a hydraulic drive vehicle equipped with a controller for controlling the engine speed and the pump discharge amount by receiving a signal, indicating means for indicating a running and working state, installed between the indicating means and the engine And a pump maximum discharge amount installed between the engine maximum speed variable means for adjusting the engine speed according to a predetermined signal, the indicating means and the hydraulic pump, and adjusting the discharge amount of the hydraulic pump according to a predetermined signal. Variable means, a predetermined signal calculated by the variable means by calculating a predetermined signal received from the indicating means It provides the number of pumps and the engine speed of the hydraulically driven vehicle control apparatus characterized the controller is provided adapted to output the call.

Description

Pump and engine speed control device of hydraulic drive vehicle

The present invention relates to a pump and an engine speed control device of a hydraulic driving vehicle, and more particularly, to control the discharge amount of a hydraulic pump driven by the engine speed and the engine to supply hydraulic oil to a plurality of actuators. A pump and an engine speed control apparatus of a hydraulic drive vehicle.

In general, heavy equipment such as hydraulic construction machines requires the engine speed and the discharge amount of the hydraulic pump to be suitable for each working device according to the change in the driving, swinging and operating of each working device of the equipment. In order to control the engine speed and the hydraulic pump, a device is installed.

FIG. 1 shows a pump and an engine speed control apparatus of a conventional hydraulic drive vehicle. As shown in FIG. 1, a hydraulic pump P connected to an output shaft of an engine 10 and driven is provided. The traveling motor 11 and the plurality of actuators 12 driven by the hydraulic oil discharged are installed in the flow path 13, and are provided between the hydraulic pump P and the traveling motor 11 and the plurality of actuators 12 described above. The valve 14 is provided with a number of controls for controlling the hydraulic oil in proportion to the switching amount and the switching direction.

In addition, the engine speed variable means 15 and the pump discharge amount variable means 16, which are provided on one side of the engine 10 and the hydraulic pump P described above, and the pressure source 17, 18 are provided at predetermined positions Detecting means 19 and 20 for detecting the driving and working state of the equipment by sensing the pressure of the hydraulic oil, and indicating means 21 for indicating the driving state of the traveling motor 11 and the working state of the equipment It is comprised by the instruction | indication means 22 which instruct | indicates the working state of the actuator 12 to perform.

On the other hand, it has a first judging means for firstly judging the running state of the equipment and a second judging means for judging whether it is in a working state other than the running state, and inputs signals from the running and working state detecting means 19 (20). The controller 23 is provided to control the engine rotation speed and the swash plate angle of the hydraulic pump P to adjust the discharge amount.

Reference numeral 24 denotes a throttle lever.

In the pump and engine speed control apparatus of the conventional hydraulic drive vehicle configured as described above, the driving motor 11 and the respective actuators 12 are operated to perform the predetermined work while the driver moves and operates the operation state indicating means 21. By selectively operating through the (22), the pressure of the pressure source (17) and (18) is sensed from the traveling and working state detection means (19) and (20) of the traveling motor (11) and each actuator (12). It is supplied to the controller 23. Thus, the controller 23 supplies the control amount corresponding to the signal amount input from the traveling and working state detection means 19, 20 to the engine speed variable means 15, and this engine speed variable means 15 The engine speed is controlled as the throttle lever 24 for adjusting the amount of fuel introduced into the engine 10 through the link mechanism by generating a rotational force proportional to the control amount supplied.

In addition, by adjusting the pump discharge amount variable means 16 to adjust the swash plate angle of the hydraulic pump (P) suitable for the engine speed to adjust the amount of hydraulic oil supplied to the traveling motor 10 and the plurality of actuators (12). .

However, the pump and engine speed control apparatus of the conventional hydraulic drive vehicle are used in the case of unstable pressure state of the pressure source 17, 18 and in case of unstable operation of the driving state and working state detection means 19, 20. In this case, a driver may not be able to travel or work due to a malfunction of the detection means itself, and there is a problem that the cost increases as a sensor is built in the detection means.

Therefore, the object of the present invention is to separate the work and travel functions by the electrical signal, to solve the unstable elements of the pressure and pressure sensor, and to reduce the product cost by the simple structure, the pump and engine speed of the hydraulic drive vehicle It is to provide a control device.

1 is a hydraulic circuit diagram schematically showing a pump and an engine speed control device of a conventional hydraulic drive vehicle.

2 is a hydraulic circuit diagram illustrating a pump and an engine speed control apparatus of a hydraulic driving vehicle according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

P: Hydraulic pump 10: Engine

11: driving motor 12: actuator

15: engine speed variable means 16: pump discharge amount variable means

30: switch 40: controller

The object of the present invention described above is an engine, a hydraulic pump driven by the engine to operate a plurality of actuators, and a controller for controlling the engine speed and the pump discharge amount by receiving signals detected from the traveling and working state detection means. In the pump and engine speed control apparatus of a hydraulic drive vehicle equipped with, the indicating means for indicating a running and working state, is installed between the indicating means and the engine, the rotational speed of the engine is adjusted according to a predetermined signal An engine maximum rotational speed variable means, installed between the indicating means and the hydraulic pump, calculating a pump maximum discharge amount varying means for adjusting the discharge amount of the hydraulic pump according to a predetermined signal, and calculating a predetermined signal received from the indicating means; Hydraulic is characterized in that the controller is configured to output a predetermined signal calculated on the variable means It is achieved by providing a pump and an engine speed control device of the drive vehicle.

According to a preferred feature of the present invention described above, the indicating means is characterized in that the stick for selecting and switching the work and driving mode, and a switch for outputting an electrical signal in accordance with the mode selected by the stick.

Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

2 is a hydraulic circuit diagram illustrating a pump and an engine speed control apparatus of a hydraulic driving vehicle according to an embodiment of the present invention.

As shown, the hydraulic pump P connected to the output shaft of the engine 10, the traveling motor 11 and the plurality of actuators 12 driven by the hydraulic oil discharged from the hydraulic pump P are The valve 14 is provided in the oil passage 13 to control the hydraulic oil in proportion to the switching amount and the switching direction between the hydraulic pump P, the driving motor 11 and the plurality of actuators 12 described above. ), And the configuration of the engine speed variable means 15 and the pump discharge variable means 16 installed on one side of the engine 10 and the hydraulic pump P described above are the same as the conventional configuration shown in FIG. Therefore, the same name and the same reference numerals are given for this and detailed description thereof will be omitted.

Therefore, according to a preferred embodiment of the present invention, a stick 31 for selectively switching the work and the driving mode is formed, the switch 30 for outputting an electrical signal in accordance with the selected mode, and the output from the switch 30 The controller 40 is configured to control the engine speed varying means 15 and the pump discharge amount varying means 16 by receiving an electrical signal.

Hereinafter, the operation of the present embodiment configured as described above will be described.

When the driver switches the stick 31, which is an instruction means for work or travel, to the desired position of work or travel, the switch 30 outputs a predetermined electrical signal according to the selected mode. At this time, the controller 40 receives the electrical signal output from the switch 30, calculates it, and outputs it as a predetermined electrical signal to the engine speed and pump discharge amount varying means 15 and 16.

Therefore, the engine speed variable means 15 is the engine rotation by adjusting the throttle lever 24 to adjust the amount of fuel flowing into the engine 10 in proportion to a predetermined amount of electrical signal output from the controller 30 To control the number.

Meanwhile, the pump discharge amount varying means 16 adjusts the swash plate angle to adjust the discharge amount of the hydraulic pump P in proportion to a predetermined electrical signal output from the controller 30, and the hydraulic oil discharged from the hydraulic pump P. Will control the amount of.

As such, when the driver selects the driving and working mode by operating the lever of the switch 30, the optimum engine 10 suitable for the selected driving and working operation state is performed by continuously performing the above series of operations. The discharge amount of the hydraulic oil discharged from the water and the hydraulic pump (P) is adjusted.

As described above, the pump and engine speed control device of the hydraulic drive vehicle according to the present invention, by separating the driving and work function only by the electrical signal, the unstable elements of the pressure and the pressure sensor in the pressure sensing is eliminated, It is possible to configure the device without prioritizing the working status, so the structure is simple and the cost is reduced by the reduction of parts.

Claims (2)

A pump of a hydraulic drive vehicle having an engine, a hydraulic pump driven by the engine to operate a plurality of actuators, and a controller for controlling the engine speed and the pump discharge amount by receiving a signal detected from the driving and working state detection means. And an engine speed control device comprising: indicating means for indicating a driving and working state; An engine maximum rotation speed varying means provided between the indicating means and the engine and adjusting the rotation speed of the engine according to a predetermined signal; A pump maximum discharge amount varying means provided between the indicating means and the hydraulic pump and adjusting the discharge amount of the hydraulic pump in accordance with a predetermined signal; And a controller for calculating a predetermined signal received from the indicating means and outputting a predetermined signal calculated in the variable means. The pump and engine of a hydraulic drive vehicle according to claim 1, wherein the indicating means includes a stick for selectively switching a work and a driving mode, and a switch for outputting an electrical signal according to a mode selected by the stick. Speed controller.