SHIFT PROHIBITING FOR AUTOMATIC SHIFT PRESELECTION MODE FOR MECHANICAL TRANSMISSION SYSTEM WITH SEMI-AUTOMATIC SHIFT IMPLEMENTATION

摘要

A control system (104) for semi-automaticallyexecuting automatically and manually selected upshiftsand downshifts of a mechanical transmission system (10)is provided. The control system includes a centralprocessing unit (106) for receiving input signalsindicative of transmission input shaft (16) and outputshaft (90) speeds, from a driver control console (108)indicative of manual selection of upshifts or downshiftsfrom a currently engaged gear ratio, or manual selectionof operation in an automatic preselect mode, and from asensor (150) to sense operator manual issuance of shiftenable signals, and processing the same in accordancewith predetermined logic rule to issue command outputsignals to a transmission actuator (112, 70, 96) toimplement the selected shifts upon a manually causedtorque reversal of the transmission and manualsubstantial synchronization of the transmission in theselected ratio thereafter. Under certain conditions,such as relatively high or relatively low vehicle speed,implementation of automatically preselected shifts isprohibited until a shift enable signal is received.