John Deere AUTOTRAC OMPFP11320 User Manual download pdf (Page 55)

GS3 2630 Advanced Settings

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Tuning Recommendations

NOTE: AutoTrac Controller has been tuned to perform

very well in most eld conditions using the

variety of implements encountered by AutoTrac.

However, for those conditions outside of normal,

we have provided Advanced Settings to allow

the operator ne tune their systems for specic

eld conditions and implements.

Problem or Situation:

AutoTrac performance during line acquisitions, Curve Trac

or in-row S-ing that can’t be tuned out using the Steering

Sensitivity adjustment.

Difcult ground conditions (extremely soft or extremely

rough) require additional tuning beyond the capabilities of

the standard Steering Sensitivity value.

Read this information in it’s entirety BEFORE tuning

AutoTrac Advanced Settings.

This software version includes 6 different tunable

sensitivities that allow ner adjustment of the AutoTrac

system. The following are details for tuning this

software:

1. Check & x other problems before you

tune—Perform necessary mechanical checks and

calibrations through associated tractor. It is important

to do this step rst otherwise you run the risk of

masking actual machine faults and wasting your time

tuning a system that cannot be tuned.

2. Characterize the current AutoTrac problem—There

are various types of issues this software may be able

to resolve. First, the specic type of problem needs to

be identied from the possible items below:

a. Excessive Wheel Motion—Overall AutoTrac

performance is acceptable, but the operator is

concerned about how quickly the wheels are

twitching back and forth.

b. Aggressive S-ing Motion—Continual back and

forth motion as observed by the operator looking

out over the front nose of the tractor. Although a lot

of motion is observed, the off-track error shown on

the display (distance away from AB line) is often

relatively small.

c. Lazy S-ing Motion—Performance of AutoTrac

seems very sluggish when trying to stay on the line

and slowly wanders from side to side.

d. Lazy Line Acquisition—AutoTrac appears

sluggish during line acquisition and the tractor

remains off to one side of the line for a long time

before getting lined up.

e. Aggressive Line Acquisition—AutoTrac

overshoots the line, and continues to

overcompensate during acquisition. Results in high

frequency, tight S-ing pattern during acquisitions.

f. Lazy Curve Track Performance—AutoTrac is

sluggish in Curve Track mode resulting in slow,

wandering S-ing about the desired line and often

tracks to the outside of the desired path.

g. Aggressive Curve Track Performance—AutoTrac

exhibits rapid and high frequency corrections in

Curve Track mode, resulting in a tight S-ing pattern

or tracking to the inside of the desired path.

3. Access the Advanced Settings page on GS2.

4. ATI Advanced Settings Parameters.

a. Line Sensitivity Heading: Determines how

aggressively AutoTrac responds to heading error.

Higher Settings: Result in more aggressive

response to vehicle heading error.

Lower settings: Result in less aggressive response

to vehicle heading error.

Range: 50 to 200.

b. Line Sensitivity Tracking (Lateral Gain):

Determines how aggressively AutoTrac responds

to off-track (lateral) error.

Higher settings: Result in more aggressive

response to vehicle off-track error.

Lower settings: Result in less aggressive response

to vehicle off-track error.

Range: 50 to 200.

c. Heading Lead: Determines the impact of yaw

rate (vehicle rate of turn) on tracking performance.

Heading lead acts as a look-ahead parameter and

can be used to minimize over steering. Large

adjustments may result in poor performance.

Higher settings: Result in more aggressive

response to yaw rate.

Lower settings: Result in less aggressive response

to yaw rate.

Range: 50 to 130.

d. Steering Response Rate: Adjusts the rate of

vehicle steering in order to maintain tracking

performance. Increasing steering responsiveness

generally results in better tracking performance.

Higher settings: Result in better tracking

performance but may also cause increased wheel

motion or jittery behavior.

Lower settings: Results in decreased wheel motion

but may also result in worse tracking performance.

Range: 50 to 200.

e. Curve Sensitivity: Determines how aggressively

AutoTrac responds to a curve in the track. This

setting affects performance in curve track guidance

only.

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John Deere AUTOTRAC OMPFP11320 User Manual Page 55

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