Linde Hydraulics showcases the next generation of LSC
Versatile, electrohydraulic load-sensing system.
- Automatic identification of user’s intentions
- Mode selection: load-sensitive or load-independent machine behaviour
- Robust design without sensors
- Control via modular valve system
- Parameterising LSC software for pre-configured work processes
- Increased energy efficiency, increased productivity
At the bauma 2013 trade fair, Linde Hydraulics will reveal – almost 30 years after it introduced load sensing with the Linde Synchron Control system – the latest development of the LSC system for mobile work machinery. LSC+ combines the characteristics of the tried-and-tested Linde Synchron Control system with the additional advantages of electronic control. Both the hydraulic and electrohydraulic versions of the LSC system boast quick actuating times and simultaneous synchronous control functionality. The electronics identify the operator’s intentions and set pump and valves to the highly dynamic or fine control range, depending on the requirement.
The driver can also define the characteristics of the working hydraulics by selecting different modes. In this way, the driver can determine whether the system is sensitive to the load when entering the ground, for example, if there are wires or pipes laid underground, or whether the system can operate independently of the load and achieve the highest digging performance possible. The same applies to road transport, for which a separate mode is available. When this mode is selected, the directional control valves are fully open and the oil flow to the travel motors is controlled via electric pump displacement.
The operator can also use the touchscreen to adapt space curves and to prioritise the boom or stick movements, for example. Using the same action on the joystick, other movement sequences can be carried out at different speeds. This flexibility means that the driver can always adapt the machine optimally to each specific working situation and can therefore be more productive.
Although it may sound like complex electronic control engineering, in practice this system is built up very simple and is based on the superimposing conventional load-sensing control system. The hydraulic pump adjusts itself automatically, which means there is no need for a complex sensor system. This is a significant advantage when working in a tough building site environment.
Another advantage, which has been achieved in this way for the first time, is the automatic identification of defined work processes by storing corresponding algorithms in the electronic control. Optimising the entire system facilitates the execution of a range of different tasks, from shaking out the excavator bucket to enabling the complete emptying or distribution of gravel, highly dynamic soil compaction and precise crane work.
As a result, the new LSC+ system enables construction machines to be employed much more flexibly and productively in a variety of working environments. An excavator can therefore be used both for precision work and high capacity digging work. The pre-configured work processes increase not only productivity, but also the driver’s comfort – thanks to the automatic identification of the user’s intentions, the driver does not need to make any adjustments whatsoever.
Linde Hydraulics offers LSC+ as a complete system including the electronic control. A new monoblock valve system, which has been developed especially for the LSC system, takes on the hydraulic control functions. For both the 25 and 30 nominal size values, there are basic blocks available in which all key hydraulic control functions are brought together in a single cast housing. The system is suited to maximum volume flows of 400 to 600 l/min per section and can be controlled electrically or hydraulically. It is easy to add other functions by means of a sandwich design, which means that the construction machine manufacturer can react rapidly and flexibly to customer requirements. The special way in which the supply channels are laid out in the monoblocks enables the working hydraulics to be operated in a very low-loss, efficient manner.
At the bauma trade fair, visitors may discover the advantages of the system which will be demonstrated with an excavator arm controlled by the LSC+ system. It moves plastic granulate using either the fine control or highly dynamic operation. Alongside wheel and crawler excavators, Linde Hydraulics sees the LSC+ system being used in the first instance in cranes and other handling equipment.