Control of a personal transporter based on user position
View Patent ↗A controller for providing user input of a desired direction of motion or orientation for a transporter. The controller has an input for receiving specification by a user of a value based on a detected body orientation of the user. User-specified input may be conveyed by the user using any of a large variety of input modalities, including: ultrasonic body position sensing; foot force sensing; handlebar lean; active handlebar; mechanical sensing of body position; and linear slide directional input. An apparatus that may include an active handlebar is provided for prompting a rider to be positioned on a vehicle in such a manner as to reduce lateral instability due to lateral acceleration of the vehicle.
1. A controller for a transporter having at least one primary ground-contacting element, the transporter characterized by a roll angle, the controller comprising:
a. an input adapted to receive specification by a user of a desired yaw, yaw rate, and direction of motion of the transporter, at least the desired yaw and yaw rate being based on a detected body orientation of the user;
b. a pitch state estimator for sensing a pitch of the transporter and outputting a pitch state signal; and
c. a processor of a kind that generates a command signal governing motion of the at least one ground-contacting element based at least on the user-specified yaw and yaw rate received by the input, in conjunction with the pitch state signal based on the pitch of the transporter, in such a manner as to maintain balance of the transporter in the course of achieving the specified yaw and direction of motion of the transporter.
2. A controller in accordance with claim 1 , wherein the input adapted to receive specification by a user is more particularly adapted to receive specification by the user of a fore/aft direction.
3. A controller in accordance with claim 1 , further comprising:
a summer for differencing an instantaneous yaw value from the desired yaw to generate a yaw error value such that the yaw command signal generated by the processor is based at least in part on the yaw error value.
4. A controller in accordance with claim 1 , wherein the input for receiving adapted to receive user specification includes a pressure sensor disposed to detect orientation of the user.
5. A controller in accordance with claim 1 , wherein the input for receiving user specification includes an ultrasonic sensor disposed to detect orientation of the user.
6. A controller in accordance with claim 1 , wherein the input for receiving user specification includes a force sensor disposed on a platform supporting the user for detecting weight distribution of the user.
7. A controller in accordance with claim 1 , wherein the input adapted to receive user specification includes a shaft disposed in a plane transverse to an axis characterizing rotation of the two laterally disposed wheels, the desired yaw specified on the basis of orientation of the shaft.
8. A controller in accordance with claim 1 , wherein the balancing transporter includes a handlebar, the controller further comprising a powered pivot for positioning the handlebar based at least upon one of lateral acceleration and roll angle of the transporter.
9. A controller in accordance with claim 1 , further comprising a position loop for commanding a handlebar position substantially proportional to a difference in the square of the velocity of a first wheel and the square of the velocity of a second wheel.