Virtual inertia enhancements in bicycle trainer resistance unit

Abstract

A method and apparatus for detecting and varying indoor bicycle trainer pedaling resistance in varying manner to replicate the effects of increased system inertia. The method uses a high-resolution position detection method to correlate crank acceleration and deceleration to resistance level. The effects of inertia are replicated by limiting acceleration of the crank by application of increased resistance unit resistance and deceleration via reduction of the resistance applied to pedaling. Thus, the decreased magnitude of acceleration events imitates the effects an increased system mass (inertia) perceived by the rider, enhancing 'road feel', which is synonymous with the feeling of accelerating one's own inertia while cycling outdoors. This is accomplished through sensors used to detect or determine crank position with a high resolution, a method of providing and varying resistance, such as an eddy current resistance device using either electromagnets or permanent magnets and a microcontroller to calculate the required magnetic field strength and adjust the field strength or magnet position in the resistance unit to facilitate the change required as determined by the outlined algorithm.