Draft load control systems

Details Draft load control systems Draft load control systems

1987-09-03

1989-01-10

Kyle, Deborah L.

Earth working

Automatic power control

Draft responsive

172 8, 172 10, A01B 63112

Patent

active

047967129

ABSTRACT:
A control system and method for adjusting the depth of a tractor-drawn draft implement in response to a detection of draft load. The control system compares actual engine rpm to a stored or mapped value of engine rpm at zero engine load conditions for the throttle setting in use. An indication of engine lug-down is thereby obtained. Through the use of another memory related to the engine torque versus rpm curve, for the actual throttle setting in use, a draft load signal is obtained. As determined by an operator sensitivity setting, a preselected portion of the draft load signal is then combined with a preselected portion of an actual draft depth position signal to form a feedback signal. A signal represntative of the draft depth desired by the operator is then combined with the feedback signal to form a command signal for raising or lowering the draft implement via a hydraulic powerlift valve.

REFERENCES:
patent: 3716104 (1973-02-01), Koenig et al.
patent: 4077475 (1978-03-01), Hino et al.
patent: 4221266 (1980-09-01), Fardal
patent: 4385353 (1983-05-01), Schneider
patent: 4503916 (1985-03-01), Weigardt
patent: 4518044 (1985-05-01), Weigardt et al.

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