Patent ID: 6113516
Filing Date: 2000-09-05
Classification: B60W,F16H,Y10T

Abstract:
A method for controlling automatic upshifting in a vehicular automated mechanical transmission system (10) for a vehicle comprising a fuel-controlled engine (12), a multiple-speed mechanical transmission (14), and a controller (28) for receiving input signals (30) including one or more of signals indicative of engine speed (ES), engaged gear ratio (GR) and vehicle speed (OS), and to process said input signals in accordance with logic rules to issue command output signals (32) to transmission system actuators including a transmission actuator (52) effective to shift said transmission, said method including establishing an upshift feasibility criteria whereby upshifts into a target gear ratio are considered feasible only if, under sensed vehicle operating conditions, substantial synchronization can be achieved above a predetermined engine speed (ESMIN); said method characterized by:(i) sensing throttle position (THL);(ii) comparing throttle position to a performance reference value (REF);(iii) if at least one of (a) considering the feasibility of a single upshift or (b) if throttle position is less than said performance reference value, causing said engine speed to equal a default value (ESMIN=ESDEFAULT); and(iv) if (a) considering the feasibility of skip upshifts and (b) throttle position exceeds said performance reference value, causing said engine speed to equal the sum of an offset value plus a default value (ESMIN=ESDEFAULT+offset).