Studies on the Steering Characteristics of Tractor (Part VI)

Analysis and Discussion of Steering Control System

Abstract

This paper presents summary results of analytical discussions of steering control system model of tractor determined by experimental method.
The differential element of the model H₁(s) put out the front wheel angle multiplied the travel speed of tractor. To obtain the optimal response, the gain constant K₁ of steering control operation is required to vary inversely with the travel speed in case of the model H₁(s) and with the forecast length in case of the model H₂(s). The stable region depends on the open loop gain K and the forecast time T₂ in the model H₂(s), but it can be controlled by the first order lag time T₁ in the model H₁(s).
The applicable ranges for the two models to obtain the optimal response are different with the travel speed. The model H₂(s) has an upper limit of travel speed and beyond the limit the range for H₁(s) can be applied.