Method for closed-loop power control of a road finishing machine or feeder and a road finishing machine or feeder comprising the same

Abstract

In the hydrostatic working operation of a road finishing machine or a feeder which comprises a primary power plant with an internal combustion engine (M) and several hydraulic variable displacement pumps, which are hydraulically connected to hydraulic motors of working components, and which possesses a computerized control device, the internal combustion engine is operated within its engine-specific characteristic map in response to the load condition by dynamic speed adaptation in a characteristic zone with optimal consumption, and the displacements (VsHP) of the variable displacement pumps are simultaneously automatically adapted for keeping the volume flow rates for the hydraulic motors constant. In the road finishing machine or the feeder, in the control device or connected to the same, a control loop for evaluating the load condition of the internal combustion engine and the current displacement of the variable displacement pumps is provided, by means of which the speed can be dynamically adjusted to or in a characteristic zone with optimal consumption, and simultaneously with the adjustment of the speed for keeping the volume flow rates for the hydraulic motors constant, thedisplacements of the variable displacement pumps can be automatically adapted.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 and to a road finisher or feeder according to the preamble of claim 8 . Background technique [0002] In the hydraulic working operation of road finishers or feeders, the internal combustion engine is usually operated at a fixed speed level independent of the hydraulic or electrical power consumption of the working parts. The reason for this is that keeping all parameters constant and not giving any flexibility to the operation of the internal combustion engine is an experimentally proven goal, since prior closed-loop control techniques and the driver's reaction do not allow fast enough adaptation to changing paving conditions. This results in a substantially higher specific fuel consumption of the engine at a fixed high rotational speed level with a lower internal combustion engine load. Also for this load state, unnecessary drag losses occur, for example because fans and hydrauli...

AI Technical Summary

Problems solved by technology

Conversely, the speed of the internal combustion engine is reduced if the power demand of the drive, which requires a constant speed, is reduced

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