Patent ID: 6979279
Filing Date: 2005-12-27
Classification: F16H,Y10T

Abstract:
1. A method for controlling automatic range shift decisions in selecting an appropriate range from at least two possible ranges in a manually shifted, multiple-ratio vehicular transmission system, each range having a plurality of ratios, the method comprising: detecting an intent to shift signal; determining a set of potential target gear ratios, in response to detecting the intent to shift signal; executing engine overspeed tests to verify at least one of the set of potential target gear ratios; determining an appropriate range based on operating variables including the target gear ratio verified by the engine overspeed tests; executing an automatic range shift to select the determined range based in part on the target gear ratio when the target gear ratio is not in a current range; and determining if the vehicle speed is above a low speed latch; and if the vehicle speed is above the low speed latch, controlling an automatic range shift, otherwise shifting the transmission system into low range.