Method of operating a transmission system of an automotive vehicle of the four-wheel drive type comprising a means of mechanically coupling the first and second axles
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United States of America Patent
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Jul 14, 2015
Grant Date -
Mar 28, 2013
app pub date -
Apr 11, 2011
filing date -
Apr 12, 2010
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Abstract
A method of operating a transmission system of an automotive vehicle, the transmission system including a mechanism of mechanically coupling first and second axles of the transmission system, a status of the coupling mechanism defining a number of transmission modes. In the method, if the automotive vehicle crosses a speed threshold for a determined length of time, for example between 30 seconds and two minutes, the transmission system switches from a first mode in which the torque that can be transmitted by the mechanical coupling mechanism is fixed, into a different transmission mode.
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