"One tool that expedites the design refinement process is multiphysics simulation," explains Feng Qi, senior mechanical engineer at FZB Technology in Plymouth, MI. Seemingly minor adjustments can greatly affect successful function, efficiency, and reliability. Schematic of electrohydraulic power steering (EHPS) system.ĭesigning a system with so many interrelated components is no small task, as the response of one part frequently depends on another. The system also includes an electronic control unit (ECU), torque sensor, valve to control fluid pressure, and a pipe system.įigure 1. The pump sends fluid from a reservoir to steering gears, which apply extra torque to turn the tires when the driver turns the steering wheel. Since the motor output is adjusted according to steering wheel angle and vehicle speed, much less power is wasted. EHPS builds on the conventional hydraulic setup, but relies on an electric motor to power a hydraulic pump, rather than power from the car’s engine (Figure 1). But these were the forerunners to the birth of a more fuel-efficient method called electrohydraulic power steering (EHPS). Until the 1990s, hydraulic and electric versions were most common. Power steering systems - which make driving much more comfortable by providing assistance through steering gears - have gone through many iterations over the years and continue to evolve with improved designs. If you’ve ever driven a car with no power steering, you’ll recall having to pull very hard on the steering wheel to turn the tires to match your movements.
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