Motor vehicles – Special wheel base – Rider propulsion with additional source of power – e.g.,...
Patent
1997-01-13
1999-11-30
DePumpo, Daniel G.
Motor vehicles
Special wheel base
Rider propulsion with additional source of power, e.g.,...
180205, 180220, 180221, B62K 1100
Patent
active
059925531
ABSTRACT:
A human-powered vehicle power augmentation system produces a signal variable in response to applied force. The signal, transmitted to a control system, produces a motor-control signal which adds boost power to the human input in proportion to the amount by which the human input exceeds a predetermined threshold value. Below the threshold value, vehicle drive power is derived solely from the human input. Above the threshold value, boost power is added to the human input in proportion to the amount by which the applied force exceeds the threshold value. In one embodiment of the invention, a boost threshold control establishes the amount of human input above which boost is applied, while a boost max control establishes a slope of boost augmentation above the boost threshold. When the amount of boost applied approaches or reaches the maximum that is available, a shift indicator is actuated to inform the rider that the time has come to shift to a lower gear. In the preferred embodiment, one or both pedals of a pedal-powered vehicle include a force sensor which controls a force-dependent pulse-repetition frequency, pulse width or carrier frequency of a radio, or other, signal which is transmitted to a receiver stationarily mounted on the vehicle. The received signal controls the amount of boost applied. A cadence indicator may be included to assist the rider in gear management.
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DePumpo Daniel G.
Morrison Thomas R.
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