Patent ID: 8489298
Filing Date: 2013-07-16
Classification: B60W,F16H,Y10T

Abstract:
1. Method to control torque converter slip in a powertrain after a rapid increase in an engine torque command, the powertrain including an engine, a transmission, and a torque converter located between the engine and the transmission, the method comprising: monitoring a measured torque converter slip after the rapid increase in the engine torque command; determining a maximum measured torque converter slip resulting from the rapid increase in the engine torque command based upon the measured torque converter slip; determining a target value to which to reduce the torque converter slip; determining a recovery profile to reduce the torque converter slip from the maximum measured torque converter slip to the target value; and utilizing the recovery profile to controllably reduce the torque controller slip; wherein determining the recovery profile to reduce the torque converter slip from the maximum measured torque converter slip to the target value comprises commanding reducing said torque converter slip at commanded torque converter slip values selected to prevent the torque converter from reaching a zero slip condition.