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MagneRide
MagneRide is an automotive adaptive suspension with Magnetorheological damper system developed by the Delphi Automotive corporation〔http://www.motor-talk.de/forum/aktion/Attachment.html?attachmentId=488981〕〔http://www.delphi-iss.com/index.asp?pageID=20013〕 and now owned by Beijing West Industries that utilizes magnetically controlled dampers, or shock absorbers, for a highly adaptive ride. As opposed to traditional suspension systems, MagneRide has no mechanical valves or small moving parts that can wear out.〔''Economist'', Vol. 371 Issue 8379〕 This system consists of four monotube dampers, one on each corner of the vehicle, a sensor set, and an ECU (electronic control unit) to maintain the system.
==Background==
The dampers are filled with magnetorheological fluid, a mixture of easily magnetized iron particles in a synthetic hydrocarbon oil. In each of the monotube dampers is a piston containing two electromagnetic coils and two small fluid passages through the piston. The electromagnets are able to create a variable magnetic field across the fluid passages. When the magnets are off, the fluid travels through the passages freely. However, when the magnets are turned on, the iron particles in the fluid create a fibrous structure through the passages in the same direction of the magnetic field. The strength of the bonds between the magnetized iron particles causes the viscosity of the fluid to increase resulting in a stiffer suspension. Altering the strength of the current results in an instantaneous change in force of the piston.〔http://www.bwigroup.com/en/pshow.php?pid=22〕 If the sensors sense any body roll, they communicate the information to the ECU. The ECU will compensate for this by changing the strength of the current to the appropriate dampers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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