Developing of the anti-slip control of hydrostatic power transmission for forest tractor and optimisation of the power of diesel engine

摘要

The aim of this study was to improve the forest tractor by developing a method for preventing the slide of the drawing wheels run properties so that the better controllability of the tractor would be reached in assignments of different types compared to the present forest tractors. The aim was to develop for the forest tractor a the hydrostatic power transmission system equipped with slow-speed radial piston motor which is based on adapting the following techniques: active anti-slip control that has been carried out with fuzzy logic connection of the integrated control technique and of the fuzzy adjustment to the control of the multi-motor system using a quick local bus and interactive user interface in control of the slide blocking. Furthermore, the aim of this work was to develop an energy efficiently optimised digital control for a forest tractor that operates in the whole speed range of the hydrostatic power transmission of the vehicle. The digital control is carried out with PC computer which guarantees the easy testing of the algorithms and offers a uniform environment for the realisation of other control systems of the work machine also. The control system must identify also the operation of the anti-slip control the speed to correspond to the measured speed of the vehicle at the slide moment and must restrict the set value. This is important so also from the point of view of an energy efficiency as the anti-slip control which functions with the brakes and the load of which an attempt must be made to minimise to prevent excessive warming and wearing out.