percycle

Percycle is a term used in speculative engineering and science fiction to describe a modular propulsion concept for pedal-powered vehicles that emphasizes per-cycle energy management. The idea centers on synchronizing mechanical input with electric assist and energy recovery within each crank cycle. In typical configurations, a small motor/generator unit is integrated with the crank and rear wheel, with sensors measuring crank angle, torque, and wheel speed. The control system uses per-cycle data to decide when to provide motor assistance or perform regenerative braking during the pedal stroke, with the aim of maximizing efficiency, extending range, and reducing peak power demand on the battery.

Origin and usage: The term has appeared in several design essays and fictional works since the early 2020s; it is not widely adopted in real-world products. It is often used to explore concepts of energy accounting and human-machine coupling in cycling.

Variants: Percycle Lite, Percycle Pro. Percycle Lite emphasizes simplicity; Percycle Pro adds more advanced energy recovery and adaptive kinematics.

Applications: In fiction, Percycle is used to illustrate next-generation personal mobility; in speculative design, it serves as a case study for energy-aware control systems in small electric vehicles.

Implementation challenges: Sensor accuracy, latency, battery weight, and safety concerns.

See also: regenerative braking, pedal-assist bicycle, energy management, per-cycle control.