1989 Volume 51 Issue 6 Pages 13-20
When higher response speed of inclination control is intended, slope tractor equipped with an inclination sensor of pendulum type often shows excessive fluctuation of tractor inclination. This occurs when the specification of the damper is inappropriate and because the pivot of the sensor pendulum is fixed on a point of the tractor.
To meet this problem, two methods are proposed and discussed about frame models, which allow the pivot point to move in relation to the tractor body. In the first method, the pendulum is set on a parallel link mechanism of front wheel suspension. when the tractor is controlled horizontally, the pivot point keeps almost same position against the surface of the terrain, and facilitate sensing of inclination on the terrain. In the second method, the pendulum is pivoted on a link of the trailing arm suspension of rear wheels, and the pivot point moves to the direction of inclination in relation to the tractor body. These both methods reduce the oscillation of the pivot point, and facilitate proper damping.
