ABSTRACT
Figure 1 shows the R&D themes tasked by this development project. To classify them broadly, for energy saving are 1) effective use of engine power, 2) HST swing control, and 3) regenerative energy control, and for improvement of controllability are 4) optimum power distribution and 5) semi - automatic control of implements. Still more simplification and parts standardization to replace the conventional system to incorporate a linkage into each implement for locus and attitude control of a bucket, the electronic control was applied to do these functions, thereby, its structure ts simplified and strength and reliability are improved. Further, to make the most of the characteristics of mechatronic control, the system is simplified and the parts are standardized by making various hydraulic valves all in common and by dealing with variation of control by software.
