Assistance Systems Crawler Dozers

• There is a significant reduction in the use of pegs and guide wires as well as personnel costs.
• There is no loss of time due to control measurements or time-consuming rework.
• The resultant fewer machine passes mean less wear and tear and less fuel consumption.
• Precise laying down of material ensures economical material use.
• Machine efficiency is increased and projects are processed faster.

The basic functionality is provided by the continuous display of the current blade inclination and the spatial position of the dozer. Typically, two sensors (IMUs) are installed. This allows capture of the blade position in terms of height and inclination.

The Liebherr control unit is located in the cab, within the new intuitive touch display, and thus within easy reach and sight of the operator. It processes the signals and keeps the blade stable. As a result, undulations during fine grading can be prevented.

The antennas mounted on the cabin roof receive signals from several GPS or GLONASS1 satellites and therefore determine the position of the blade. A base station is necessary to achieve the required accuracy. Its position is precisely measured and calibrated when setting up the construction site. Increasingly, companies are also using correction data from regional providers, which can be called up via GSM or the Internet. Measurement data of the desired terrain profile are made available in standardised formats and are transferred to the control unit.

The control unit processes the signals from GPS receivers, tilt sensors and base stations and compares them with the stored default values from the site model. It controls the lift and tilt of the blade automatically through the operating hydraulics. This creates a profile that corresponds to the specified terrain data.

1) Communication unit and CPU (MC-X3):

• for data transmission and for determining correction data via the Internet and radio
• for processing all data of all components and for continuous calculation of blade position

2) Two GNSS receivers (GR-i3F): to receive all satellite systems and to precisely position the dozer and the blade

3) Intuitive display (GX-55/75): to display and control all key parameters

4) Two sensors on the blade and one sensor on the chassis (TS-i4 IMU): for measuring acceleration and angles of movement and for maintaining the blade in the target position

5) Transport case: serves to protect the GNSS antennas and GX55/75 display (can be ordered as an option)