Patent ID: 7974753
Filing Date: 2011-07-05
Classification: A61G,B60L,B62D,G05G,Y02T,Y10S

Abstract:
1. A direction and speed control device for an electronic wheelchair, the electronic wheelchair including a wheel unit, a wheel driving unit coupled to and driving rotation of the wheel unit, and a driving control circuit connected to and controlling driving operation of the wheel driving unit, said direction and speed control device comprising: a base member adapted to be mounted on the electronic wheelchair; a manually operable pointing unit mounted on said base member and including a control stick pivotable relative to said base member; a first three-axis g acceleration sensor mounted on said control stick and operable to generate a voltage output indicative of tilt of said control stick in three orthogonal axes; a second three-axis g acceleration sensor mounted on said base member and operable to generate a voltage output indicative of tilt of said base member in the three orthogonal axes; and a control unit coupled to said first and second three-axis g acceleration sensors so as to receive the voltage outputs thereof, and operable so as to process the voltage outputs of said first and second three-axis g acceleration sensors to generate corresponding control signals for enabling the driving control circuit to control the driving operation of the wheel driving unit in order to control in turn rotation direction and speed of the wheel unit.