Patent ID: 6949050
Filing Date: 2005-09-27
Classification: F16H,Y10T

Abstract:
1. A shift pressure control apparatus for controlling a shift pressure to perform a shift in an automatic transmission, the shift pressure control apparatus comprising: a controller to determine a starting input-torque-dependent pressure from a transmission input torque at a start of a shift; to hold the shift pressure at the starting input-torque-dependent pressure during the shift; to monitor an operating parameter representing an engine load of an engine connected with the automatic transmission, to detect an engine load change; and to modify the shift pressure to a modified pressure determined by modifying the starting input-torque-dependent pressure with a difference between a second engine-load-dependent pressure determined from the engine load after the engine load change and a first engine-load-dependent pressure determined from the engine load at the start of the shift when the engine load change is detected.