Electric power steering (EPS) is designed to use an electric motor to provide directional control to the driver of a vehicle. Most EPS systems have variable assist, which allows for more assistance as the speed of a vehicle decreases and less assistance from the system during high-speed situations. This functionality requires a delicate balance of power and control that has only been available to manufacturers in recent years. The EPS system is replacing the hydraulic steering system and is destined to soon become mainstream among automotive manufacturers.
Electric power steering systems do not require engine power to operate. Thus, a vehicle equipped with an EPS system may achieve an estimated three percent greater fuel economy than the same vehicle with conventional hydraulic power steering. As an added benefit, more of the engine's power is transmitted to its intended location — the wheels.