Utility vehicle driveline control method
AssigneeDeere & Company
InventorHeinz Weiss
Life of this patent
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Abstract
A method is described for controlling the power train of a work vehicle. The power train includes an engine with a fuel injection control and an infinitely variable transmission. The method include first determining an initial engine speed, an initial wheel speed, the actual engine speed, and the actual wheel speed. To improve comfort and reduce fuel consumption and emissions two steps are performed. First, the transmission ratio of the infinitely variable transmission will be increased if the actual engine speed is less than the initial engine speed, or decreased if the actual engine speed is greater than the initial engine speed. Second, while the transmission ratio remains constant, the engine speed will be adjusted until the engine speed is the same as the initial engine speed.
Claims9
A driveline control system for a utility vehicle having an engine (10) with fuel injection control system, a manually-operated throttle lever, and an infinitely variable transmission (16), the driveline control system having means for determining and storing in memory an initial engine output rotational speed (N(mo)), an initial wheel rotational speed (N(ro)), an actual engine rotational speed (N(mn)) and an actual wheel rotational speed (N(rn)), the driveline control system performing a method comprising the following steps:
- increasing the transmission ratio of the infinitely variable transmission if the actual engine speed N(mn) is less than the initial engine speed N(mo);
- decreasing the transmission ratio of the infinitely variable transmission if the actual engine speed N(mn) is greater than the initial engine speed N(mo);
- and
- while the transmission ratio remains constant, adjusting the engine speed until the actual wheel rotational speed N(rn) is the same as the initial wheel rotational speed N(ro).
Dependencies are inferred from the claim text.