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Steer-by-wire



Steer-by-wire Rating  :      

Close on the heels of Drive-by-wire (in which the cable linkage from the accelerator pedal to the throttle valve is replaced by an electrical linkage from a pedal sensor to the engine control unit), engineers are now looking at applying the same general approach to steering, to create ‘steer-by-wire’ (SBW). In SBW, the mechanical steering column is replaced by a steering wheel position and movement sensor, which electrically transmits data to an electronic control unit. The control unit in turn instructs an EPAS system to position the front wheels at a certain angle.

There are two big potential advantages to SBW. By eliminating the mechanical steering column, SBW makes system installation much easier and saves weight, also doing away with any worries about rear-ward movement of the column in a frontal impact. Moreover, converting the steering signal into an electrical form allows it to be processed in useful ways. For example, it could be told to disregard driver steering inputs which would cause loss of control (while allowing the maximum available cornering force to be maintained without loss of control), or it might accept inputs from advanced forward-looking sensors which could trigger automatic avoiding action.
 
The big doubt with ‘Steer-by-wire’ is what happens in the event of a system failure (including electric power failure)? There is no natural ‘fail-safe’ for primary steering; returning the wheels to the straight-ahead position as a reaction to a computer failure could, in the wrong circumstances, send you over the edge of a cliff. Both Delphi and BMW have been extensively researching SBW — as on the German carmaker’s Z22 test vehicle which features 70 innovations — and it will be only a short while before SBW becomes commonplace.
 
Posted By - sandeep kumar singh Posted On - Nov 19, 2010
Thanks for the latest information

Posted By - munna Posted On - Mar 25, 2013
This is very usefull tutorial

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