System and method for selecting a transmission gear ratio
OwnerFadi S. Kanafani, Brian P. Gebby +1inventors
InventorsFadi S. Kanafani, Brian P. Gebby, Michael J. Prucka
Life of this patent
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Abstract
An automatic transmission control system includes a shift map that includes predetermined ranges of vehicle speeds at which vehicle engine speeds require gear shifts for the automatic transmission based on requests for torque. The predetermined ranges include upper bounds that correspond to gear upshifts and lower bounds that correspond to gear down shifts. A shift map control module varies at least one of the predetermined ranges of vehicle speeds based on at least one vehicle condition that affects movement of the vehicle.
Claims20
An automatic transmission control system for a vehicle comprising:
- a shift map that includes predetermined ranges of vehicle speeds at which vehicle engine speeds require gear shifts for the automatic transmission based on requests for torque, wherein said predetermined ranges include upper bounds that correspond to gear upshifts and lower bounds that correspond to gear down shifts;
- and
- a shift map control module that varies at least one of said predetermined ranges of vehicle speeds based on at least one vehicle condition that affects movement of the vehicle.
An automatic step transmission control system for a vehicle comprising:
- a shift map that comprises M discrete gear shift parameters that correspond to vehicle speeds at which vehicle engine speeds require gear shifts and a variogram that includes predetermined upper and lower hysteresis bands for each of said M discrete gear shift parameters that correspond to optimal shift points for the automatic step transmission based on requests for torque;
- and
- a shift map control module that varies at least one of said upper and lower hysteresis bands in relation to a respective one of said M discrete gear shift parameters based on at least one vehicle condition that affects movement of the vehicle, and wherein said shift map control module generates a shift control signal based on said variogram.
A powertrain control system for a vehicle comprising:
- a driver input sensing module that determines vehicle operator torque requests;
- a vehicle speed sensing module that detects vehicle speeds of the vehicle;
- an engine speed sensing module that defects engine speeds of the vehicle;
- a vehicle condition sensor that senses at least one vehicle condition that affects movement of the vehicle;
- a shift map that comprises M discrete gear shift parameters that correspond to said vehicle speeds at which said vehicle engine speeds require gear shifts and a variogram that includes predetermined default upper and lower hysteresis bands for each of said M discrete gear shift parameters that correspond to optimal shift points for the automatic step transmission based on said vehicle operator torque requests;
- and
- a shift map control module that varies at least one of said upper and lower hysteresis bands in relation to a respective one of said M discrete gear shift parameters based on said at least one vehicle condition, and wherein said shift map control module generates a shift control signal based on said variogram.
Dependencies are inferred from the claim text.