path. In this case, the turning circle is large, so it is possible to turn without braking. It is
necessary to improve and to better evaluate the turn control algorithms. Doing this might
make it possible to reduce the backup distance and to save turning time.
Fig. 10 shows the steering angle, the yaw angle and the deviation for the third path of
the automated rice transplanting operation. Fig. 11 shows those parameters for traveling on
concrete. In Fig. 10, the steering angle ranges from−0.08 to 0.04. The yawangle ranges from
−0.07 to 0. The deviation ranges from−0.07 to 0.08 m. In Fig. 11, the steering angle, the yaw
angle and the deviation are almost constant. In Fig. 10, the steering angle is 0 between 25 and
45mfrom the starting point, even though the yawangle is shifted by−0.04 and the deviation
is shifted by 0.04 m. This is due to insufficient accuracy even though the FOG was set using
the calculated result by Eq. (5). In paddy fields, because of flimsy ground and variable
terrain conditions, sideslip sometimes occurs during the calculation of the yaw angle offset.
In this study, the steering control parameters were obtained experimentally. The authors
thought that it would be difficult to estimate the location and direction of the vehicle by
relying only from calculation of vehicle dynamics, since soil conditions are not constant and
5 45
path. In this case, the turning circle is large, so it is possible to turn without braking. It isnecessary to improve and to better evaluate the turn control algorithms. Doing this mightmake it possible to reduce the backup distance and to save turning time.Fig. 10 shows the steering angle, the yaw angle and the deviation for the third path ofthe automated rice transplanting operation. Fig. 11 shows those parameters for traveling onconcrete. In Fig. 10, the steering angle ranges from−0.08 to 0.04. The yawangle ranges from−0.07 to 0. The deviation ranges from−0.07 to 0.08 m. In Fig. 11, the steering angle, the yawangle and the deviation are almost constant. In Fig. 10, the steering angle is 0 between 25 and45mfrom the starting point, even though the yawangle is shifted by−0.04 and the deviationis shifted by 0.04 m. This is due to insufficient accuracy even though the FOG was set usingthe calculated result by Eq. (5). In paddy fields, because of flimsy ground and variableterrain conditions, sideslip sometimes occurs during the calculation of the yaw angle offset.In this study, the steering control parameters were obtained experimentally. The authorsthought that it would be difficult to estimate the location and direction of the vehicle byrelying only from calculation of vehicle dynamics, since soil conditions are not constant and5 45
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