Patent ID: 6347517
Filing Date: 2002-02-19
Classification: A01B,E02F

Abstract:
A hydraulic circuit for agricultural or earthmoving machinery, comprising:a variable displacement pump for supplying the high-pressure fluid to said hydraulic distributor; at least one electrically controlled hydraulic distributor which is supplied with a high-pressure fluid and, on command, distributes said high-pressure fluid to at least one hydraulic power take-off, said hydraulic distributor regulating the delivery of said variable displacement pump by means of a fluid flow returned to said variable displacement pump through a feedback conduit; a control unit for controlling said electrically controlled hydraulic distributor to regulate the flow of high-pressure fluid through said hydraulic power take-off, said hydraulic distributor having at least one electrically operated valve for regulating the passage of the high-pressure fluid to said hydraulic power take-off; and a self-calibrating means for determining a response curve of said at least one electrically operated valve, and for calibrating said control unit on the basis of said response curve said self-calibrating means including detecting means for detecting variations in the pressure of the fluid in said feedback conduit.