A vehicle (10) with a steering control unit is disclosed. The vehicle has a front pair of hydrostatically driven ground wheels (14, 16), in which steering is accomplished by applying differential hydraulic flow to respective hydraulic drive motors (26, 28) coupled to the front pair of driven ground wheels (14, 16). A manually operable primary front wheel steering control valve (100) is coupled for receiving steering inputs from a shaft (114) operated by a steering wheel (60) and having right and left steering fluid ports respectively coupled to right and left steering ports of a double-acting steering cylinder (106). The primary steering valve (100) has a normal predetermined internal leakage of pressure fluid when actuated for supplying pressure fluid to one or the other of the right and left steering fluid ports. In order to improve steering control the vehicle comprises a steering control arrangement comprising: an electronic control unit (ECU) (66); a front steering input sensor (116); a vehicle speed sensor (84); an electro-hydraulic, automatic front wheel steering control valve (104), and normally deactivated electrically responsive, right and left proportional front steering control valve arrangements (158, 178, 162, 192) electrically coupled to said ECU (66). The ECU (66) is operable for processing a steering input signal (118), a vehicle ground speed signal (86) and the information relating to said normal amount of leakage, and for sending an enable signal (202) to an enable valve arrangement (138, 148) and for selectively sending a steering signal to one of a right and left proportional steering control valve arrangement (158, 178, 162, 192) corresponding to the direction of steering indicated by the steering input signal (118), thereby causing said one of the right and left proportional steering control valve arrangements (158, 178, 162, 192) to supply an amount of actuating fluid to the steering cylinder (106) which is approximately equal to the normal, predetermined internal leakage of the primary steering valve (100).


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    Title :

    Vehicle


    Additional title:

    Fahrzeug
    Véhicule


    Contributors:

    Publication date :

    2017-06-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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