Control strategies for a multi-mode drive system
AssigneeChrysler Group LLC
InventorsJoseph E. Kubina, Aaron E. Thompson, Donald F. Schmanski, Michael W. Gapski, Kenneth M. Pachucki, Richard S. Silbert
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Abstract
A method of operating a multi-mode drive system that precisely orchestrates a shift between gear ratios in a power take off unit and a rear drive module. The method first shifts between gear ratios in the power take off unit and then, depending upon the success or failure of the shift of the power take off unit, shifts between gear ratios in the rear drive module.
Claims20
A method of shifting a multi-mode drive unit comprising a transmission, a power take off unit having a first plurality of gear ratios and coupled to said transmission, and a rear drive module having a second plurality of gear ratios and coupled to said power take off unit, wherein said method in response to a shift request comprises:
- initiating a shift in said power take off unit from operation in a first gear ratio of said first plurality of gear ratios to operation in a second gear ratio of said first plurality of gear ratios;
- monitoring the progress of said shift of said power take off unit;
- rejecting said shift request if said power take off unit is unable to successfully shift from operation in said first gear ratio of said first plurality of gear ratios to operation in said second gear ratio of said first plurality of gear ratios;
- and
- shifting said rear drive module from operation in a first gear ratio of said second plurality of gear ratios to operation in a second gear ratio of said second plurality of gear ratios if said shift of said power take off unit is successfully completed.
A method of operating a multi-mode drive unit comprising a transmission, a power take off unit having a first plurality of gear ratios and coupled to said transmission, and a rear drive module having a second plurality of gear ratios and coupled to said power take off unit, said first plurality of gear ratios having gear ratio ratios corresponding to said second plurality of gear ratios, comprising:
- receiving a shift request;
- determining whether at least one interlock condition is satisfied;
- rejecting said shift request if said at least one interlock condition is not satisfied;
- initiating a shift in said power take off unit from operation in a first gear ratio of said first plurality of gear ratios to operation in a second gear ratio of said first plurality of gear ratios if said at least one interlock condition is satisfied;
- monitoring the progress of said shift of said power take off unit;
- rejecting said shift request if said power take off unit is unable to successfully shift from operation in said first gear ratio of said first plurality of gear ratios to operation in said second gear ratio of said first plurality of gear ratios;
- and
- shifting said rear drive module from operation in a first gear ratio of said second plurality of gear ratios corresponding to said first gear ratio of said first plurality of gear ratios to operation in a second gear ratio of said second plurality of gear ratios corresponding to said second gear ratio of said first plurality of gear ratios if said shift of said power take off unit is successfully completed.
Dependencies are inferred from the claim text.