An improved hydraulic drive system is provided for a tractor of the type which has hydraulically driven wheels at a cab end and castor wheels at an engine end where each of the driven wheels is driven by a hydraulic motor supplied with fluid from a pump which has continuous stepless adjustment of the displacement. The motor is improved by providing a continuous stepless adjustment of the motor displacement. The motor displacement is controlled by an electronic controller in response to stroking of the speed control lever to manage the displacement to provide required drive torques at different points in the stroke. There is provided an automatic steering system having a guidance controller arranged to receive GPS position information which controls the steering by differentially adjusting the displacement of the motors so that the automatic steering is independent of the manual steering which controls the pumps.


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    Title :

    SPEED AND STEERING CONTROL OF A HYDRAULICALLY DRIVEN TRACTOR


    Additional title:

    COMMANDE DE VITESSE ET DE DIRECTION D'UN TRACTEUR A ENTRAINEMENT HYDRAULIQUE


    Contributors:
    OTTO PHIL (author) / MACGREGOR DON (author) / BERGMAN LEONARD (author)

    Publication date :

    2016-06-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion



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