CPC B60K 17/3505 (2013.01) [B60K 23/0808 (2013.01); F16D 48/06 (2013.01); B60W 2510/0275 (2013.01); B60W 2510/0291 (2013.01); F16D 2500/30404 (2013.01); F16D 2500/30406 (2013.01)] | 20 Claims |
1. A system for controlling a torque transfer clutch of a four-wheel drive vehicle comprising:
a first data input source that indicates if the torque transfer clutch is in a four-wheel drive mode;
an energy integrator system that monitors energy transferred across a transfer clutch;
a temperature data source provides transfer clutch temperature data; and
a controller programmed with an algorithm that controls the torque transfer clutch based in part on a transfer point value, wherein the algorithm:
in a first case responds to energy integrator accumulated data as to the energy across the torque transfer clutch during a monitoring period and compares the energy accumulator accumulated data to a maximum accumulated energy value by initiating a powertrain torque dependent transfer point learn routine,
in a second case responds to energy accumulator cycle data as to the energy across the torque transfer clutch in a single monitoring cycle and compares the energy accumulator cycle data to a maximum cycle data value by initiating a non-powertrain torque dependent transfer point learn routine,
in a third case responds to clutch temperature data and compares the clutch temperature data to a maximum temperature value by initiating the non-powertrain torque dependent transfer point learn routine;
wherein the controller, responsive to one of the above transfer point learn routines, revises the transfer point value to a revised transfer point value, wherein the controller controls the torque transfer clutch based upon the revised transfer point value.
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