Patent ID: 6619451
Filing Date: 2003-09-16
Classification: B60K

Abstract:
In a control system for starting and running-down a power-take-off shaft on an agricultural vehicle or tractor, including a hydraulically actuated clutch, which is located in the drive train on a shaft between the engine and the power-take-off shaft of the tractor; a solenoid valve which is fed with pressure from the hydraulic circuit of the tractor, which is connected to the hydraulically actuated clutch; and a controller with processor, which is connected via a signal line to the solenoid valve, for the transmission of output signals and is connected with switches controllers and sensors for picking up input signals, the improvement comprising:one of the sensors is the sensor for measuring the viscosity and temperature of the hydraulic fluid; at least one variably adjustable control is present for altering the quantity of hydraulic fluid and with it altering the time for engagement and disengagement of the hydraulically actuated clutch; a further sensor is the lift position sensor for determining the current position of a lift, which is connected with at least one further variably adjustable sensor for determining the positions of the lift, at which the hydraulically actuated clutch should automatically respectively engage or disengage; and in the controller are stored constantly improving learning curves for various tools, conditions of use and machine-specific values, with which the controller by evaluation of the input signals passed to it selects the optimum learning curves for a renewed engagement and disengagement.