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Essential difficulties in the operation processes of a single-bucket excavators is the fact that they are multi-functional machines. They can be fitted out with a range of various working features. Hence, elaborate automatic control system is being indispensable. It makes possible, the flexible co-operation with the operator in carrying out different technological tasks. The structure of this system ought to make possible an easy adaptation of the single-bucket excavator for carrying out specific tasks (without wasting a lot of machines' working time). This also applies to work in hazardous conditions for the operator, or completing the earth-moving operations with great precision. In this paper, a solution of such a system is discussed, backed by computer-aided controls in connection with remote control and laser control systems for fixing the position of the machine with improved precision.

The study presents the issue of kinematic discrepancy of hydrostatic drive systems of high mobility vehicles, and its impact on the presence of the unfavourable phenomenon of circulating power. Furthermore, it presents a theoretical discussion concerning the capacity of the compensation of kinematic discrepancy by a hydrostatic drive system on the basis of tests using static characteristics.

SUMMARYThe functional structure of operator's computer aided system in control of single bucket excavator's work is presented. There is described two control algorithms making possible the realization of earth moving process and copying of working motions by computer aided system that were showed earlier by operator. The exemplary results of experimental researches indicate that the described system and control algorithms make possible the effective realization of technological tasks that are carried out by the single bucket excavators.

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