Controlling automatic transmission with electrohydraulic actuators - adjusting ignition angle at precise times of attainment of hydraulic pressures pertaining to up=and=down changes

摘要

The rotational speed of the engine or transmission input shaft during changes of ratio represents only one reaction quantity w.r.t. the torque transmission capacity of the mechanism. A computer calculates the hydraulic control pressure (PB) for an actuator taking part in the process, and adjusts the timing of the ignition advance and retardation precisely when predetermined and memorised pressures are attained. Progressions of negative speed gradient (NM) and angle of ignition (Z) are also covered. ADVANTAGE - Starting points of retardation of ignition and of its restoration to normal angle can be adjusted more exactly for more comfortable changes of transmission ratio.