Velocity control of agricultural machinery

Details Velocity control of agricultural machinery Velocity control of agricultural machinery

2006-12-05

2006-12-05

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S448000

Reexamination Certificate

active

07143579

ABSTRACT:
The apparatus is an automatic velocity control system for an agricultural machine. Three feedback circuits are used to increase reliability and repeatability of the apparatus despite variations in load and ground conditions and non-linear responses of control components. A solenoid current sensor supplies a feedback signal to control a current controller for solenoids controlling a hydraulic valve, a hydraulic cylinder position sensor provides a feedback signal to counteract the non-linearity of the hydraulic valve controlling the hydraulic cylinder, and wheel speed sensors supply vehicle speed signals to be compared to the signal from the operator's speed control. A microprocessor processes the sensor signals to maintain the desired velocity.

REFERENCES:
patent: 5070695 (1991-12-01), Metzner
patent: 5542251 (1996-08-01), Leibing et al.
patent: 5561979 (1996-10-01), Coutant et al.
patent: 5592817 (1997-01-01), Nishimura et al.
patent: 6807809 (2004-10-01), Schuh

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