Method and apparatus for automatic transmission cruise control.

摘要

In order to prevent hunting between a selected gear ratio (e.g. overdrive) and the next lower one when a vehicle ascends a slope or incline under "cruise control", the degree to which which the cruise control arrangement (viz., the automatic vehicle speed control device (ASCD)) can open the throttle valve is limited to a value at which the transmission control circuit (e.g. hydraulic) will induce a downshift. Upon a downshift being necessary to maintain vehicle speed, upshift is inhibited either for a predetermined period of time or until the load which necessitated the downshift disappears.