Patent ID: 6702666
Filing Date: 2004-03-09
Classification: A01D,F16H

Abstract:
An agricultural combine comprising;a. a chassis; b. an internal combustion engine mounted on the chassis; c. a drive system coupled to the engine, the drive system including: i. a hydraulic pump coupled to the engine to be driven thereby to provide hydraulic fluid under pressure; ii. a hydraulic motor in fluid communication with the hydraulic pump to receive the hydraulic fluid under pressure and be driven thereby; iii. a multi-speed gearbox having a plurality of selectable gear ratios; iv. a rotor driven by the gearbox and configured to thresh agricultural products; and d. an electronic control system including; i. an engine speed sensor coupled to the engine to generate a signal indicative of engine speed; ii. a motor speed sensor coupled to the motor to generate a signal indicative of motor speed; and iii. at least one electronic controller coupled to the motor speed sensor and the engine speed sensor and configured to estimate the pressure of the hydraulic fluid under pressure.