Patent ID: 7046917
Filing Date: 2006-05-16
Classification: B60K,B60Y,B62K

Abstract:
1. A speed controlling device of a motorized cart for a person to ride on, comprising an angularly displaceable control member usable for controlling the speed controlling device; a speed regulating potentiometer including at least one variable resistor; the speed regulating potentiometer being connected to the control member so as to output voltage, which depends on angular displacement of the control member; a wave filter connected to an output terminal of the speed regulating potentiometer to work as a filter for output voltage of the speed regulating potentiometer; a microprocessor connected to an output terminal of the wave filter at an input terminal thereof; the microprocessor being capable of producing digital signals according to output voltage of the wave filter, which digital signals will be output via an output terminal of the microprocessor; a digital-to-analogue converter connected to the output terminal of the microprocessor for converting digital signals of the microprocessor into an analogue voltage; a motor controlling unit connected to both a motor of a motorized cart and an output terminal of the digital-to-analogue converter for making the motor run at a variable-speed mode, at which variable-speed mode speed of the motor will depend on output analogue voltage of the digital-to-analogue converter, thus making speed of the cart depend on angular displacement of the control member; a constant-speed control switch electrically connected to an input terminal of the microprocessor; the microprocessor being going to ignore output voltage of the wave filter, and being going to start and continue giving a same stable digital signal to the digital-to-analogue converter immediately after the constant-speed control switch is used to start a constant-speed mode, at which constant-speed mode the motor will run at a constant speed for the cart to move at a constant speed; the digital-to-analogue converter being going to output a same voltage to the motor controlling unit when the microprocessor gives a same stable digital signal to the digital-to-analogue converter.