Patent ID: 6517465
Filing Date: 2003-02-11
Classification: B60K,Y10T

Abstract:
A method for controlling the drive mechanism of a utility vehicle having a hydraulic load fed by a constant pressure pump driven by an engine including a pressure sensor configured to said pump, a power take-off shaft, said drive mechanism further including a transmission, a power take-off shaft clutch and a controller, comprising the steps of:engaging said pressure sensor in a controlled manner to increase the rotational speed of said engine; if said hydraulic load is switched on, automatically increasing the, rotational speed of said engine; if said hydraulic load is switched off, automatically decreasing the rotational speed of said engine; if said engine is operating at a rotational speed greater than a threshold, automatically reducing the rotational speed below said threshold; engaging said power take-off shaft clutch in a controlled manner at a rotational speed of the engine lower than said threshold; after complete engagement of said power take-off shaft clutch, increasing the rotational speed of said engine by said controller up to a rotational speed required for a nominal speed of rotation of the power take-off shaft; and automatically decreasing the rotational speed of said engine when said power take-off shaft clutch is subsequently disengaged.