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''ControlTrac'' four-wheel drive is the brand name of a selectable automatic full-time four-wheel drive system offered by Ford Motor Company. The four-wheel drive system was designed and developed at BorgWarner under its TorqTransfer Systems division in the mid 1980s. BorgWarner calls the system ''Torque-On-Demand'' (TOD). ControlTrac was the first automatic system to use software control and no planetary or bevel geared center differential.〔 Instead of a planetary or bevel geared center differential, the system uses a variable intelligent locking center multi-disc differential. ==Availability== ''ControlTrac'' made its debut on January 12, 1995, for the 1995 model year on the second generation Ford Explorer mid-size sport utility vehicle.〔 A heavy-duty version of ControlTrac was introduced in 1996 for the 1997 model year on the first generation Ford Expedition full-size sport utility vehicle.〔 '' *Does not have Four Low mode with low range off road reduction gearing''. The fifth generation 2011 Ford Explorer (U502) replaced automatic ''ControlTrac'' four-wheel drive with automatic ''Intelligent'' four-wheel drive and Terrain Management. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ControlTrac」の詳細全文を読む スポンサード リンク
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