Power Steering

 In automobiles, an influence steering mechanism helps drivers steer the vehicle by augmenting steering effort needed to show the wheel, making it easier for the vehicle to show or maneuver. Hydraulic or electric actuators add controlled energy to the steering system, therefore the driver can provide less effort to show the steered wheels when driving at typical speeds, and reduce considerably the physical effort necessary to show the wheels when a vehicle is stopped or moving slowly. Power steering also can be engineered to supply some artificial feedback of forces working on the steered wheels. Hydraulic power-assisted steering systems for cars augment steering effort via an actuator, a hydraulic cylinder that's a part of a servo system. These systems have an immediate mechanical connection between the wheel and therefore the linkage that steers the wheels. This means that power-steering system failure (to augment effort) still permits the vehicle to be steered using manual effort alone. Electric power steering systems use electric motors to supply the assistance instead of hydraulic systems. As with hydraulic types, power to the actuator (motor, during this case) is controlled by the remainder of the facility steering mechanism. Other power-assisted steering systems (such as those in the largest off-road construction vehicles) haven't any direct mechanical connection to the steering linkage; they require electric power . Systems of this type, with no mechanical connection, are sometimes called "drive by wire" or "steer by wire", by analogy with aviation's "fly-by-wire". In this context, "wire" refers to electrical cables that carry power and data, not thin wire rope mechanical control cables. Some construction vehicles have a two-part frame with a rugged hinge within the middle; this hinge allows the front and rear axles to become non-parallel to steer the vehicle.   

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