CLOSED-LOOP FEEDBACK CONTROL AND REDUCTION OF THE TORQUE CONVERTER CLUTCH SLIP FOR ENHANCED DRIVABILITY FOR HEAVY TIP-IN MANEUVERS

• Main Authors: HEARLD SCOTT A, CHEN XU, TAO XUEFENG TIM, OTANEZ PAUL G, LEE CHUNHAO J, SAMIE FARZAD, WICKMAN DANIEL J
• Format: Patent
• Language: English
• Published: 07.07.2011
• Subjects: CALCULATING; COMPUTING; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PERFORMING OPERATIONS; PHYSICS; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TRANSPORTING; VEHICLES IN GENERAL

A method for responding to a rapid change in engine torque includes monitoring a change in engine torque and determining a rapid change in engine torque when the change in engine torque exceeds a threshold change in engine torque. Subsequent to determining a rapid change in engine torque, an increase in the torque converter slip is provided by reducing the torque converter clutch pressure command by a selected value and thereafter the feedback control is deactivated for a predetermined duration. Subsequent to the predetermined duration, the feedback control is reactivated to decrease the torque converter slip toward a desired torque converter slip value.