Method and arrangement for controlling cable winding and unwinding in an electrically driven vehicle
AssigneeTamrock Oy
InventorsAleksei Tschurbanoff, Jukka Lehtonen
Life of this patent
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Abstract
A method and an arrangement for controlling cable winding and unwinding in an electrically driven vehicle. In the method, cable winding and unwinding, respectively, are controlled on the basis of the position of driving and/or steering means of the vehicle. The arrangement comprises only one unwinding valve connected in series with a hydraulic motor, by which valve the counterpressure of the hydraulic fluid flowing through the hydraulic motor can be regulated during cable unwinding from the reel, and one unwinding valve respectively, by which the quantity of the hydraulic fluid coming to the hydraulic motor can be regulated during cable winding.
Claims11
A method for controlling winding and unwinding of a cable in an electrically driven vehicle, in which method a cable is wound by rotating a cable reel in a first direction by means of a hydraulic motor coupled thereto, and unwound from the reel by rotating the cable reel in an opposite direction in a braked condition by using the hydraulic motor as a hydraulic pump, the method comprising:
- winding and unwinding the cable as a function of a direction of motion of the vehicle;
- controlling the winding and unwinding, respectively, of the cable as a function of a position of driving and/or steering means of the vehicle, and
- during winding of the cable, feeding the hydraulic motor with hydraulic fluid from a source of hydraulic fluid, with volume flow of the hydraulic fluid being regulated as a function of the position of said driving and/or steering means of the vehicle.
Apparatus for unwinding and winding a cable in an electrically driven vehicle, the apparatus comprising a cable reel;
- a hydraulic motor for rotating the cable reel during winding of the cable and for braking rotation of the cable reel during unwinding of the cable;
- a hydraulic pump for feeding hydraulic fluid at a feed pressure to the hydraulic motor;
- and a plurality of control valves for controlling the feed of hydraulic fluid to the hydraulic motor during winding of the cable and for throttling the flow of hydraulic fluid during unwinding of the cable;
- an unwinding valve connected in series with the hydraulic motor, said unwinding valve arranged to regulate counterpressure of the hydraulic fluid flowing through the hydraulic motor and rotational resistance of the hydraulic motor during unwinding of the cable from the reel;
- a winding valve arranged to regulate the quantity of hydraulic fluid coming to the hydraulic motor during winding of the cable;
- and control means for controlling the unwinding valve and the winding valve during unwinding and winding of the cable, respectively, and wherein driving and steering components of the vehicle are connected to said control means.
Dependencies are inferred from the claim text.