Transmission control system

A transmission control system for used in a bicycle having a crank, a front sprocket that is rotatable independent of the crank, a rear wheel, a rear sprocket that is rotatable independent of the rear wheel, a chain that engages with the front sprocket and the rear sprocket, and at least one external transmission mechanism, the transmission control system comprising:

• a driving force output device configured to drive the chain;
• a rotational state detection device configured to detect a rotational state of the crank;
• and
• at least one controller programmed to control the driving force output device to drive the chain and to control a gear shifting action of the at least one external transmission mechanism to shift gears, based on the rotational state of the crank that is detected by the rotational state detection device, upon determining that the rotational state of the crank is in a prescribed state,
• the at least one controller being further programmed to stop a driving action of the chain by the driving force output device upon determining the gear shifting action of the at least one external transmission mechanism to shifting gears is completed.

A transmission control system for used in a bicycle having a crank, a front sprocket that is rotatable independent of the crank, a rear wheel, a rear sprocket that is rotatable independent of the rear wheel, a chain that engages with the front sprocket and the rear sprocket, and at least one external transmission mechanism, the transmission control system comprising:

• a driving force output device configured to drive the chain;
• a rotational state detection device configured to detect a rotational state of the crank;
• at least one controller programmed to control the driving force output device to drive the chain and to control a gear shifting action of the at least one external transmission mechanism to shift gears, based on the rotational state of the crank that is detected by the rotational state detection device, upon determining that the rotational state of the crank is in a prescribed state;
• and
• a speed detection device configured to detect a riding speed of the bicycle, the at least one controller being programmed to control a driving force outputted by the driving force output device so that the driving force will not exceed a reference value that corresponds to the riding speed that is detected by the speed detection device.

A transmission control system for used in a bicycle having a crank, a front sprocket that is rotatable independent of the crank, a rear wheel, a rear sprocket that is rotatable independent of the rear wheel, a chain that engages with the front sprocket and the rear sprocket, and at least one external transmission mechanism, the transmission control system comprising:

• a driving force output device configured to drive the chain;
• a manual drive force detecting device configured to detect a manual drive force that is inputted to the crank;
• and
• at least one controller programmed to control the driving force output device to drive the chain and a gear shifting action of the at least one external transmission mechanism to shift gears, based on the manual drive force that is detected by the manual drive force detecting device, upon determining that the manual drive force is less than or equal to a prescribed value.

A transmission control system for used in a bicycle having a crank, a front sprocket that is rotatable independent of the crank, a rear wheel, a rear sprocket that is rotatable independent of the rear wheel, a chain that engages with the front sprocket and the rear sprocket, and at least one external transmission mechanism, the transmission control system comprising:

• a driving force output device configured to drive the chain;
• a speed detection device configured to detect a riding speed of the bicycle;
• and
• at least one controller programmed to control the driving force output device to drive the chain and to control a gear shilling action of the least one external transmission mechanism to shift gears, based on the riding speed that is detected by the speed detection device, upon determining that the riding speed is less than or equal to a first prescribed value.