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An electrically assisted bicycle includes a motor current sensor for controlling a transistor switch in the motor circuit and circuity means establishing a duty cycle and switching rate. The duty cycle is monitored to shut off the motor when the duty cycle approaches an inappropriate level, such as

An electrically assisted bicycle includes a motor current sensor for controlling a transistor switch in the motor circuit and circuity means establishing a duty cycle and switching rate. The duty cycle is monitored to shut off the motor when the duty cycle approaches an inappropriate level, such as 50%. When the motor control circuit is open and the bicycle is pedal driven, the voltage generated by the motor is monitored to complete the motor control circuit when the bicycle is driven at 4 miles per hour.

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An electrically assisted bicycle includes a motor current sensor for controlling a transistor switch in the motor circuit and circuity means establishing a duty cycle and switching rate. The duty cycle is monitored to shut off the motor when the duty cycle approaches an inappropriate level, such as

An electrically assisted bicycle includes a motor current sensor for controlling a transistor switch in the motor circuit and circuity means establishing a duty cycle and switching rate. The duty cycle is monitored to shut off the motor when the duty cycle approaches an inappropriate level, such as 50%. When the motor control circuit is open and the bicycle is pedal driven, the voltage generated by the motor is monitored to complete the motor control circuit when the bicycle is driven at 4 miles per hour. 700, 20030100, Hailey, Jr., 166/278; US-20030000701, 20030100, Dusterhoft et al., 166/278; US-20030000702, 20030100, Streich et al., 166/278; US-20030010496, 20030100, McGregor et al., 166/278