Patent ID: 6101439
Filing Date: 2000-08-08
Classification: B60K,F16H,Y10T

Abstract:
A method for controlling a transfer case having a neutral state and a plurality of drive modes in an automatic four-wheel-drive driveline for a motor vehicle having an engine drivably connected to the transfer case, the method comprising:sensing if the engine is drivably decoupled from the transfer case and setting a first variable to ""T"" if the engine is decoupled, otherwise setting the variable to ""F"";sensing if the vehicle speed is substantially zero and setting a second variable to ""T"" if the speed is substantially zero, otherwise setting the second variable to ""F"";sensing if the vehicle brake is being applied and setting a third variable to ""T"" if the brake is applied, otherwise setting the third variable to ""F""; andif all the first, second and third variables are ""T"", setting a shift condition flag to ""T"" to permit a shift of the transfer case through a neutral state, otherwise setting the shift condition flag to ""F"" and not permitting a shift of the transfer case through the neutral state.