Patent ID: 8983746
Filing Date: 2015-03-17
Classification: F16D

Abstract:
1. A method of modeling initial temperatures of a dry dual clutch transmission following an offline period of a transmission control module (TCM) lasting from a first clock time to a second clock time, the method comprising: reactivating the TCM at the second clock time; calculating a time lapse between the first clock time and the second clock time; reading last known temperatures of a first component and a second component, wherein the respective last known temperatures occurred at, or just prior to, the first clock time; calculating a first temperature difference between the last known temperature of the first component and the last known temperature of the second component; loading a first predefined exponential function, wherein the first predefined exponential function relates temperature differences between the first component and the second component as a function of time; calculating a first stop time on the first predefined exponential function based upon the calculated temperature difference, wherein the first stop time normalizes the first clock time relative to the first predefined exponential function; calculating a first start time on the first predefined exponential function from the calculated time lapse and the calculated first stop time, wherein the first start time normalizes the second clock time relative to the first predefined exponential function; calculating a first conductive heat transfer between the first component and the second component, wherein calculating the first conductive heat transfer includes integrating the first predefined exponential function between the first stop time and the first start time; calculating a first conductive temperature change between the first component and the second component based upon the calculated first conductive heat transfer; calculating a starting temperature of the first component from the calculated first conductive temperature change; and executing a control action on the dry dual clutch transmission based upon the starting temperature of the first component.