Draft control system with closed loop drop/raise rate control

Details Draft control system with closed loop drop/raise rate control Draft control system with closed loop drop/raise rate control

1991-09-10

1994-06-14

Taylor, Dennis L.

Earth working

Automatic power control

Draft responsive

172 7, 36442407, A01B 6310

Patent

active

053201868

ABSTRACT:
In an automatic draft control system for positioning a hitch, velocity feedback loop techniques are employed to control the rate of movement of the hitch. When the system is operating in an open loop position control mode, a switch mounted on a tractor fender enables an operator to manually control raising/lowering of the hitch for the purpose of attaching an implement. Hitch position is sensed and a microprocessor calculates the first derivative of the hitch position signal to determine actual hitch velocity. The actual velocity is subtracted from a desired velocity value to obtain a velocity error signal. The error signal is subjected to an integral control algorithm and the integrated value is used to energize raise or lower solenoids controlling a valve which raises or lowers the hitch. When the actual hitch velocity is equal to or greater than the desired hitch velocity, the integrated value is saved. When the next raise/lower sequence is initiated the integrator is reset to the saved value. This eliminates delays in starting hitch motion. The desired velocity value may be derived from the setting of a drop rate potentiometer in which case a drop rate value is added to the integrated error signal with the result being used to modify a hitch movement command that energizes the "lower" solenoid, thereby limiting the hitch drop rate when the system is operating in a closed loop position/draft control mode.

REFERENCES:
patent: 4132273 (1979-01-01), Mortonson et al.
patent: 4518044 (1985-05-01), Wiegardt et al.
patent: 4571500 (1986-02-01), Mucheyer
patent: 4715012 (1987-12-01), Mueller, Jr.
patent: 4817499 (1989-04-01), Bellanger et al.
patent: 4822962 (1989-04-01), MacCourt
patent: 4846283 (1989-07-01), Batcheller
patent: 4852657 (1989-08-01), Hardy et al.
patent: 4907493 (1990-03-01), Bellanger et al.
patent: 4929092 (1990-12-01), Bergene et al.
patent: 4931967 (1990-06-01), Boe et al.
patent: 4969527 (1990-11-01), Boe et al.
patent: 5143159 (1992-09-01), Young et al.
patent: 5190111 (1993-03-01), Young et al.
SAE Technical Paper 901561 Development of the Electronic Draft Control System for the Ford New Holland 8210 Tractor.

Affiliated with

Also associated with

Rating

Draft control system with closed loop drop/raise rate control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Draft control system with closed loop drop/raise rate control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Draft control system with closed loop drop/raise rate control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1241985