Power controlled exercising machine and method for controlling the same

An exercise machine is described which is entirely self-contained without any source of outside power. A rechargeable battery is used to maintain the exercise system operative for a time-out period. At all other times the machine is powered by the user. The machine is compact, light, rigid and sized to fit through a standard doorway. The entire exercise machine is provided with a wrap-around handrail into which a display input/output unit has been integrally provided. The exercise machine or stepper utilizes a dynamically controllable load or alternator which is controlled by a computer circuit to maintain the power input into the exercise machine or to maintain metabolically energy consumption rate within a user of the exercise machine at a predetermined, approximately constant level, regardless of the speed of stepping or the actual or effective weight of the user. The alternator is dynamically controlled by pulse width modulating its field coils. The power output by the generator is sensed by monitoring the alternator's output current and voltage. Additional load control is achieved by dissipating part of the alternator current in a dissipative load when the alternator voltage reaches a predetermined maximum set point.

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We claim:

1. A method for controlling an exercise machine comprising the steps of:

transforming motion of a user into a predetermined mechanical motive force and converting motion into motion of a shaft

resisting said predetermined motive force to maintain an approximately constant power input into said exercise machine; generating electrical power form rotation of said shaft at a predetermined magnitude; and generating electrical power in analternator having current in its field coils pulse width modulated in response to sensed current and voltage output from said alternator to maintain said predetermined magnitude of power,

whereby quantifiably controlled energy rate levels of exercise are achieved.

2. The method of claim 1 further comprising the step of selectively shunting a portion of current from said alternator into a dissipative load to further control said step of resisting said motive force.

3. A method for controlling an exercise machine comprising the steps of:

transforming motion of a user into a predetermined mechanical motive force through an exercise input unit;

driving a dynamically controllable load by said predetermined motive force;

sensing the voltage and current of said dynamically controllable load through said exercise input unit by a sensing circuit; calculating from said sensed voltage and current the power coupled into said dynamically controllable load; and

controlling said dynamically controllable load using a control circuit to require a predetermined amount of power to be provided to said exercise input unit by a user,

whereby a substantially constant or quantifiable energy rate of exercise is provided.