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Commissioning
English, Revision 07, Date: 07.03.2018
56
4.11.4.2 Steering correction
Steering correction is to improve the steering accuracy. If for example a steering trap-
ezoid is used, then the inaccuracy increases with the degree of the angle. To compen-
sate for any inaccuracies and deviations, the following procedures may be used:
1.
Travel a straight line with the vehicle and measure the necessary steering
angle.
2.
Travel a left turn with ¼ of the maximal steering angle, measure the circle
diameter and calculate the theoretical steering angle with arctangent (axle
distance/curve radius)
3.
Travel left turn with 2/4 of the maximal steering angle, measure the circle
diameter and calculate the theoretical steering angle with arctangent (axle
distance/curve radius)
4.
Travel left turn with 3/4 of the maximal steering angle, measure the circle
diameter and calculate the theoretical steering angle with arctangent (axle
distance/curve radius)
5.
Travel left turn with 4/4 of the maximal steering angle, measure the circle
diameter and calculate the theoretical steering angle with arctangent (axle
distance/curve radius)
6.
Repeat points 2 through 5 for the right turn
7.
Display the theoretical and the actual steering angles in a point diagram
8.
Then insert a 2nd degree polynomic trend line and have the equation dis-
played
9.
The above listed steps lead to the diagram below and the equation pro-
vides the needed correction coefficients.
Key
Name
Descriptio
A
Steering min
Lowest limit of steering
B
Steering Middle
Center setting of steering
C
Steering max
Upper limit of steering
D
Steering Scaling
Resolution of steering on interface: if the angle is transmitted with of 1/
100
o
, the parameter must be 100
E
Comp. Left 2
Square term of steering correction for left turn
F
Comp. Left 1
Linear term of steering correction for left turn
G
Comp. Middel
Center setting of steering correction
H
Comp. Right 1
Linear term of steering correction for right turn
I
Comp. Right 2
Square term of steering correction for right turn
J
Servo Typ
Enables setting the connected steering servo. Supported are Lenze and
Berger Lahr
Table 35
Parameters Navigation > Steering