Investigation of roll angle feed-forward control and look-ahead functions to improve automatic guidance on sloped terrain

Open and Closed Loop System Characteristics of a Tractor and an Implement Dynamic Model

“…John Deere (JD) 8320 agricultural tractor and typical grain cart parameters were used to simulate the models (Table 1). The tractor parameters and the formula for the z-moment of inertia were adapted from Bosserd (2007). The grain cart geometric parameters were measured using a three dimensional geometric model, and the mass was estimated to be a full load of corn.…”

“…For a CASE 7220 farm tractor, Stombaugh et al (1999) calculated the ratios d v /I v = 11.4 and K v /I v = 13.8. Bosserd (2007) used a time constant of 0.1 s in the steering dynamics model of the JD 8320 tractor. In this work, the parameters used were K v = 10.0, I v = 1 and d v = 10.0, which corresponded to the time constant used in Bosserd (2007).…”

“…Bosserd (2007) used a time constant of 0.1 s in the steering dynamics model of the JD 8320 tractor. In this work, the parameters used were K v = 10.0, I v = 1 and d v = 10.0, which corresponded to the time constant used in Bosserd (2007). A tire relaxation length σ of 1.5 times the tire radius was used in this work (Bevly et al, 2002).…”

Modeling, identification and analysis of tractor and single axle towed implement system

“…where d v is the damping constant, K v is the input gain and I v is the inertial constant, all of the steering system. In this work, the parameters used were K v = 10.0, I v = 1 and d v = 10.0, which corresponded to the 0.1 s time constant used in Bosserd II (2007). Closed loop responses with all three models were studied over a range of forward velocities using an eigenvalue maps, damping ratio plot, and settling distance plot.…”