Guided control of a transporter
A method for conducting the motion of a transporter under riderless conditions. The transporter has two laterally disposed primary wheels. In accordance with the method, an input is received via a user input disposed on the transporter and a control signal corresponding to the input received is generated. Then a torque is applied to the laterally disposed wheels so as propel the transporter on the basis of at least the control signal. The control signal may correspond to either a commanded torque or to a commanded transporter velocity. The torque may include coadded terms where the terms are, respectively, proportional to the control signal, to a counteracting artificial friction proportional to the common velocity of the wheels, and a term proportional to the differential rotation of the wheels to facilitate turning of the transporter.
1. A transporter for transporting a load over a surface, the transporter comprising:
a. a support platform for supporting the load, the support platform characterized by a fore-aft axis, a lateral axis, and an orientation with respect to the surface, the orientation referred to as an attitude;
b. at least two ground-contacting members coupled to the support platform in such a manner as to provide locomotion of the support platform with respect to an underlying surface;
c. a motorized drive arrangement for driving the at least two ground-contacting members;
d. a user input for receiving a command from a user not carried by the transporter to govern operation of the motorized drive arrangement;
e. at least one sensor sensing the attitude of the support platform; and
f. a controller for commanding the motorized drive arrangement based at least on the attitude of the support platform, the controller generating a control signal based on the user input and commanding the motorized drive on the basis of a sum of coadded terms including at least a first term proportional to the control signal and a second term defining a counteracting contribution proportional to a common component of rotational velocity of the ground contacting members.
2. The transporter according to claim 1 , additionally comprising a ride detector detecting a presence of the user on the transporter.
3. The transporter according to claim 2 , wherein the controller determines a gain to apply to the control signal based on a signal from the ride detector.
4. A transporter for transporting a load over a surface, the transporter comprising:
a. a support platform for supporting the load, the support platform characterized by a fore-aft axis, a lateral axis, and an orientation with respect to the surface, the orientation referred to as an attitude;
b. at least one ground-contacting member coupled to the support platform in such a manner as to provide locomotion of the support platform with respect to an underlying surface;
c. a motorized drive arrangement for driving the at least one ground-contacting member;
d. a user input for receiving a command from a user not carried by the transporter to govern operation of the motorized drive arrangement;
e. a ride detector detecting a presence of the user on the transporter;
f. at least one sensor sensing the attitude of the support platform; and
g. a controller for commanding the motorized drive arrangement, the controller determining a gain to apply to the control signal based on a signal from the ride detector and generating a control signal for the motorized drive arrangement based on the user input and on the attitude of the support platform.