Hitch positioning with slip override control and calibrated whee

Details Hitch positioning with slip override control and calibrated whee Hitch positioning with slip override control and calibrated whee

1991-06-03

1993-03-02

Reese, Randolph A.

Earth working

Automatic power control

Draft responsive

172 2, 36442407, 36442603, A01B 63112

Patent

active

051901110

ABSTRACT:
An automatic draft control for controlling the position of a tractor-mounted hitch includes a slip override circuit responsive to a wheel signal for modifying a hitch position command so that hitch draft is reduced by raising the hitch when the degree of tractor wheel slip exceeds a threshold value. The slip is determined by measuring theoretical (no-slip) ground speed with a sensor which senses the rate of rotation of the tractor rear axle, and measuring true ground speed with a radar unit mounted on one side of the tractor. Because the radar unit does not indicate the speed of the center line of the tractor as it turns, the slip signal is prevented from modifying the hitch position command if the hitch is raised since the hitch is usually raised when turning and there is no need to modify the position command with the slip signal when the hitch is raised. The true ground speed is automatically and repeatedly divided by the rate of rotation of the tractor rear axle when conditions are such that wheel slippage is unlikely. The multiple divisions produce plural indications of a correction factor. These indications are filtered to obtain a correction factor which accounts for variations in the effective rolling radius of the wheels. Once the correction factor has been determined it is applied to the wheel speed sensor output to calculate the theoretical ground speed of the vehicle.

REFERENCES:
patent: 3834481 (1974-09-01), Carlson
patent: 3913680 (1975-10-01), Carlson
patent: 4344499 (1982-08-01), van der Lely et al.
patent: 4454919 (1984-06-01), Arnold et al.
patent: 4465142 (1984-08-01), van der Lely et al.
patent: 4518044 (1985-05-01), Wiegardt et al.
patent: 4809785 (1989-03-01), Arnold et al.
patent: 4846283 (1989-07-01), Batcheller
patent: 4848481 (1989-07-01), Bidon et al.
patent: 4969527 (1990-11-01), Boe et al.
patent: 4979092 (1990-12-01), Bergene et al.
patent: 5012415 (1991-04-01), Boe et al.
SAE Technical Paper 891835 Tractor Three-Point Hitch Control System.
SAE Technical Paper 901561 Development of the Electronic Draft Control System for the Ford New Holland 8210 Tractor.

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