Samsung Heavy Industries Co., Ltd.

Volvo Construction Equipment Korea Co., Ltd.

Jin Han Lee

Jin T Kim

Sang T Jeong

Ju K Kim

Jeong Chul Lee

Bong D Hoang

Jang U Jo

In Taek Nam

Chan H Lee

Young Il Jin

Keun T Lee

Sang C Heo

Seong Soo Chun

A device for controlling the operation of power excavators includes a control lever which is handled simply by one hand, which is different from the prior art systems having multiple control levers necessarily handled by both hands. The control lever consists of a plurality of links which are jointed together in such a way that the intuitive handling directions of the links are identified with the actual moving directions of the actuators. The control lever thus adds significant convenience for the operator when operating the actuators of the excavator. An excavator with the above control device can be easily and effectively operated by an unskilled operator even for delicate work such as a land finishing work or loading work, both of which tasks are generally known in the art to require a highly-skilled operator.

Device for controlling the operation of power excavators

A method for detecting the direction and displacement of a rod member of a hydraulic cylinder assembly is provided. The hydraulic cylinder assembly includes a plurality of magnetic sensors for outputting a magnetic field variation signal disposed adjacent a hydraulic cylinder. The plurality of magnetic sensors cooperate with a plurality of magnetic projections equally spaced along a rod member for producing the magnetic field variation signal. The signal is converted from a sine wave into a square wave by using a microprocessor. The edges of the converted square wave are counted to accurately detect a direction and displacement amount. The method further includes the steps of ignoring a square wave edge caused by disturbance, if the square wave edge occurs prior to a pre-set time, wherein the pre-set time is based on the average time interval for previous edges. The method further includes the step of generating a correction edge when no edge is detected during the pre-set time interval. The method still further includes the step of detecting successive correction edges for determining an absolute position of the hydraulic stroke.

Absolute position detection method for stroke sensing cylinder

A device and method for automatically vibrating the working members of a power construction vehicle such as a power excavator is disclosed. The device and method effectively change both the amplitude of vibration and the number of vibrations of a working member in proportion to a levering angle of an associated control lever during an excavating, breaking or ground hardening operation of a construction vehicle. The automatic vibration device is thus free from any select switch. The device simplifies the construction of the hydraulic system and more easily controls the automatic vibration operations, and thereby is convenient to operators.

Device and method for automatically vibrating working members of power

A device and method for selecting a control mode in a power construction vehicle is disclosed. The device has a control mode select switch which selects a function for setting new matching relations between the control levers and the proportional control valves. A controller sets the new matching relations and stores the new matching relations, and controls the actuators in accordance with the new matching relations. In the control mode selection method, one operational motion of an actuator is primarily selected and displayed on a display means. Thereafter, a voltage signal indicative of a levering angle of a control lever associated with the selected actuator is output, thus setting a new matching relation between the control lever and an associated proportional control valve. The above process is repeated in order to continuously set and store new matching relations between the control levers and proportional control valves associated with the other actuators.

Device and method for selecting control mode in power construction

A control device for a travelling system in construction vehicles is disclosed. The control device applies the pilot pressure of the pilot pump to the spool of the directional control valve separately from the travelling control pedal, thus automatically controlling operation of the directional control valve. However, the manual control mode performed by the travelling control pedals has priority over the automatic control mode. The control device has a proportional control valve, which applies the pilot pressure of the pilot pump to the spool in response to an input current signal. A pressure sensor checks the pilot pressures, which are generated by both the travelling control pedals and the proportional control valves and act on the spool. A controller receives a signal indicative of the pilot pressures checked by the pressure sensor and outputs the current signal to the proportional control valve.

Control device for travelling system in construction vehicles

A control system of an excavator. The excavator includes a lower running body, an upper pivoting body, a working device having a plurality of links attached to the upper pivoting body, a pivoting device, and a running device, actuators for actuating the working device, the pivoting device, and the running device, hydraulic control valves for controlling quantities of hydraulic fluid supplied to the actuators, sensors for detecting relative angular positions of the links, and a control system. The control system includes a pair of manipulating devices each of which can be manipulated in at least three directions so as to output electrical signals proportional to deviated amounts in selected directions among the directions from a neutral position thereof, a switch board on which a plurality of function switch are installed, for outputting a signal in accordance with a selected function and displaying the selected function, a control section for controlling quantifies of hydraulic fluid supplied to the hydraulic cylinders and the hydraulic motors by receiving signals from the manipulating device, the switch board, and the angle detecting sensors and transferring the signals to the hydraulic control valves.

Control system of an excavator

A control system for automatically controlling the operation of actuators of an excavator. The control system of the invention provides several advantages in that the travelling mode of the travelling motors is automatically changed between the first and second step travelling modes in order to efficiently correspond to the load imposed on the travelling motors depending on the ground surface condition, the brake mechanism for the swing motor section is controlled with an adjustable timing control, the synchronous operation of the swing motor and the boom cylinder is controlled by simply setting a relative actuating velocity therebetween, flow rate of hydraulic fluid from the main hydraulic pumps to each actuator is automatically controlled in case of handling the control levers/pedals for initiating the actuators or stopping the actuating of the actuators, flow rate of the hydraulic fluid for the cylinder actuators in order to drive the cylinder actuators without occurrence of shock at an end of cylinder of each cylinder actuator, a lifting operation of an excavator is adjustably controlled so as to prevent a tipping accident of the excavator.

Control system for automatically controlling actuators of an excavator

An automatic actuating system for actuators of excavator. The system of this invention automatically controls the bucket which is overloaded to be free from the overloaded state thereof, the bucket to maintain an angular position with respect to the absolute line of the ground surface so as to prevent the objects contained in the bucket from being dropped, the bucket cylinder and the boom cylinder to accomplish the desired surface finishing operation by handling for the dipper cylinder, actuators to limit the operational ranges thereof, optimal quantity of hydraulic fluid flow of the main hydraulic pumps for respective actuators, and the pre-running for the actuators.

Growing community of inventors

Changwon, South Korea

Jin Han Lee