An electric power steering system (200) for vehicles including a driving control circuit (76, 100, 108) for feeding, in consideration of an output signal (S.sub.1, S.sub.2) from a steering torque detection mechanism (77) for detecting steering torque (Ts) acting on an input shaft (4), a drive signal...http://www.google.fr/patents/US4727950?utm_source=gb-gplus-shareBrevet US4727950 - Electric power steering system for vehicles
