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A bicycle includes an auxiliary power unit for regenerating electric energy even with no braking operations. A power-assisted bicycle includes a controller for detecting a torque value of a pedaling torque applied to a crankshaft for controlling an output of a brushless motor according to the torque

A bicycle includes an auxiliary power unit for regenerating electric energy even with no braking operations. A power-assisted bicycle includes a controller for detecting a torque value of a pedaling torque applied to a crankshaft for controlling an output of a brushless motor according to the torque value detected. A power transmitting member outputs the pedaling torque applied to the crankshaft to a rear wheel with a clutch unit for permitting an output of a driving force of the brushless motor to the rear wheel, but not an output of power from the rear wheel to the brushless motor. A selector selects whether or not to permit transmission of power from the rear wheel to the brushless motor. The clutch unit includes a lock-up ratchet for selectively permitting an output of power from the rear wheel WR to the brushless motor according to an operation of the selector.

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1. A bicycle with an auxiliary power unit including a detecting controller configured to detect a torque value of a pedaling torque applied to a crankshaft for controlling an output of a motor according to the torque value detected, the bicycle comprising: a power transmission configured to output t

1. A bicycle with an auxiliary power unit including a detecting controller configured to detect a torque value of a pedaling torque applied to a crankshaft for controlling an output of a motor according to the torque value detected, the bicycle comprising: a power transmission configured to output the pedaling torque applied to the crankshaft to a drive wheel and including a clutch unit, wherein the clutch unit includes a one-way ratchet permitting an output of a driving force of the motor to the drive wheel, but not an output of power from the drive wheel to the motor; anda selection device configured to select whether or not to permit transmission of power from the drive wheel to the motor;wherein the clutch unit further includes a lock-up ratchet cooperating with the selection device to selectively permit an output of power from the drive wheel to the motor according to an operation of the selection device. 2. The bicycle with an auxiliary power unit according to claim 1, wherein the clutch unit normally permits transmission of only the power from the crankshaft to the drive wheel and, when the lock-up ratchet is made operative through the operation of the selection device, permits transmission of power from the drive wheel to the motor. 3. The bicycle with an auxiliary power unit according to claim 2, wherein the power transmission includes: a hollow output shaft for outputting power to the drive wheel;wherein the selection device is disposed inside the output shaft; andwherein the lock-up ratchet is selectively made operative or inoperative by pressing the selection device. 4. The bicycle with an auxiliary power unit according to claim 3, wherein the clutch unit is interposed between the output shaft and a drive shaft of the motor. 5. The bicycle with an auxiliary power unit according to claim 4, wherein the power transmission includes: a motor driving force transmission configured to transmit the driving force of the motor to the output shaft;wherein the clutch unit is disposed on a side of the output shaft; andwherein the motor driving force transmission transmits the driving force of the motor to the output shaft via the clutch unit. 6. The bicycle with an auxiliary power unit according to claim 5, wherein the motor is disposed between the crankshaft and the power transmission. 7. The bicycle with an auxiliary power unit according to claim 3, wherein the pedaling torque applied to the crankshaft and the driving force of the motor are transmitted to the output shaft. 8. The bicycle with an auxiliary power unit according to claim 4, wherein the power transmission includes: a motor driving force transmission configured to transmit the driving force of the motor to the output shaft;wherein the clutch unit is disposed on a side of the drive shaft of the motor; andwherein the driving force of the motor is transmitted to the motor driving force transmission via the clutch unit. 9. The bicycle with an auxiliary power unit according to claim 3, wherein the selection device includes: a first pressure section having a hollow outside end and a second pressure section disposed inside the first pressure section; andwherein pressing the first pressure section makes the lock-up ratchet inoperative and pressing the second pressure section makes the lock-up ratchet operative. 10. The bicycle with an auxiliary power unit according to claim 9, wherein the pedaling torque applied to the crankshaft and the driving force of the motor are transmitted to the output shaft. 11. The bicycle with an auxiliary power unit according to claim 1, wherein the power transmission is accommodated together with the motor in a case. 12. A bicycle with an auxiliary power unit including a controller configured to detect a torque value of a pedaling torque applied to a crankshaft for controlling an output of a motor according to the torque value detected, the bicycle comprising: a power transmission configured to output the pedaling torque applied to the crankshaft to a drive wheel and including a clutch unit for permitting an output of a driving force of the motor to the drive wheel, but not an output of power from the drive wheel to the motor; anda selection device configured to select whether or not to permit transmission of power from the drive wheel to the motor;wherein the clutch unit includes a lock-up ratchet configured to selectively permit an output of power from the drive wheel to the motor according to an operation of the selection device, and the clutch unit further includes a one-way ratchet,wherein the selection device includes a first pressure section having a hollow outside end and a second pressure section disposed inside the first pressure section, wherein pressing the first pressure section makes the lock-up ratchet inoperative and pressing the second pressure section makes the lock-up ratchet operative,wherein the selection device further includes:a function of selecting whether or not to permit transmission of the driving force from the motor to the drive wheel; anda function of rotating the first pressure section when the lock-up ratchet is inoperative makes the one-way ratchet inoperative and the lock-up ratchet operative, to thereby allow the clutch unit not to permit transmission of the driving force from the motor to the drive wheel and to permit transmission of power from the drive wheel to the motor. 13. The bicycle with an auxiliary power unit according to claim 12, wherein the pedaling torque applied to the crankshaft and the driving force of the motor are transmitted to the output shaft. 14. An auxiliary power unit for a vehicle, comprising: a controller configured to detect a torque value of a torque applied to a crankshaft of the vehicle for controlling an output of a motor according to the torque value detected;a power transmission configured to output the torque applied to the crankshaft;a clutch unit including a one-way ratchet permitting an output of a driving force of the motor, but not an output of power from a drive wheel to the motor; anda selection device configured to select whether or not to permit transmission of power from the drive wheel to the motor;wherein the clutch unit further includes a lock-up ratchet cooperating with the selection device to selectively permit an output of power from the drive wheel to the motor according to an operation of the selection device. 15. The auxiliary power unit according to claim 14, wherein the clutch unit normally permits transmission of only the power from the crankshaft to the drive wheel and, when the lock-up ratchet is made operative through the operation of the selection device, permits transmission of power from the drive wheel to the motor. 16. The auxiliary power unit according to claim 15, wherein the power transmission includes: a hollow output shaft for outputting power to the drive wheel;wherein the selection device is disposed inside the output shaft; andwherein the lock-up ratchet is selectively made operative or inoperative by pressing the selection device. 17. The auxiliary power unit according to claim 16, wherein the selection device includes: a first pressure section having a hollow outside end and a second pressure section disposed inside the first pressure section; andwherein pressing the first pressure section makes the lock-up ratchet inoperative and pressing the second pressure section makes the lock-up ratchet operative. 18. The auxiliary power unit according to claim 17, wherein the selection device further includes: a function of selecting whether or not to permit transmission of the driving force from the motor to the drive wheel; anda function of rotating the first pressure section when the lock-up ratchet is inoperative makes the one-way ratchet inoperative and the lock-up ratchet operative, to thereby allow the clutch unit not to permit transmission of the driving force from the motor to the drive wheel and to permit transmission of power from the drive wheel to the motor. 19. The auxiliary power unit according to claim 16, wherein the torque applied to the crankshaft and the driving force of the motor are transmitted to the output shaft. 20. The auxiliary power unit according to claim 16, wherein the clutch unit is interposed between the output shaft and a drive shaft of the motor.