Patent ID: 6427110
Filing Date: 2002-07-30
Classification: B60W,F16H

Abstract:
An apparatus for controlling a drive system for an industrial truck having an internal combustion engine and a hydrostatic transmission wherein the hydrostatic transmission has a pump the delivery volume of which is variable and at least one hydraulic engine acting on at least one wheel of the industrial truck, comprising:a first controller (22) for the speed of the industrial truck in which a desired speed value (VSoll) compares to a actual value arriving from a speed transducer (30), further in which a speed controller (32) determines a corresponding desired motive force (FSoll) and in which the signal for the motive force and the actual speed is provided to a characteristics stage (34) in which at least one characteristic is stored which assigns approximately optimal rpm values to power values of the internal combustion engine (10) and presets a corresponding desired-value signal for the number of revolutions of the internal combustion engine (10), and a second controller (20) underlying the first controller (22) having a desired-value and actual-value comparator in which an actual value of the pump (12) arriving from a pressure transducer is compared to desired-pressure value (&Dgr;pSoll), further in which a pressure controller (26) produces a variation signal for the delivery volume (&phgr;) in the pump (12), wherein a desired-value transducer (39) for the pressure determines the desired value (&Dgr;pSoll) from the desired motive force (FSoll) and parameters of the drive system.