Abstract: A method for detecting tie-up in an automatic transmission is provided. The rate of change of the output shaft acceleration is calculated by twice differentiating with respect to time the transmission output shaft speed. The calculated rate is then compared to a predetermined value, and each time the acceleration rate drops below the predetermined value, a controller stores the event in memory. If the acceleration rate drops below the predetermined value too frequently, a flag is set and indication of the transmission tie-up is prevented. When a predetermined amount of time passes, during which the acceleration rate does not drop below the predetermined value, the flag is cleared and indication of a tie-up is allowed. When the acceleration rate drops below the predetermined value, and the transmission is in a shift cycle and tie-up prevention flags are cleared, a transmission tie-up is indicated.

Abstract: The present invention provides a fast learn algorithm for quickly providing data to a data table and a controller. Existing data is considered, such that information gathered from prior events is not arbitrarily overwritten. An error is determined for a first data cell based on current operating conditions and the occurrence of an event. Weighting factors are then applied to data cells removed from the first data cell, such that some or all of the data cells in the data table can be populated based on the data input into the first data cell.

Abstract: A method for detecting tie-up in an automatic transmission is provided. The rate of change of the output shaft acceleration is calculated by twice differentiating with respect to time the transmission output shaft speed. The calculated rate is then compared to a predetermined value, and each time the acceleration rate drops below the predetermined value, a controller stores the event in memory. If the acceleration rate drops below the predetermined value too frequently, a flag is set and indication of the transmission tie-up is prevented. When a predetermined amount of time passes, during which the acceleration rate does not drop below the predetermined value, the flag is cleared and indication of a tie-up is allowed. When the acceleration rate drops below the predetermined value, and the transmission is in a shift cycle and tie-up prevention flags are cleared, a transmission tie-up is indicated.

Abstract: The present invention provides a fast learn algorithm for quickly providing data to a data table and a controller. Existing data is considered, such that information gathered from prior events is not arbitrarily overwritten. An error is determined for a first data cell based on current operating conditions and the occurrence of an event. Weighting factors are then applied to data cells removed from the first data cell, such that some or all of the data cells in the data table can be populated based on the data input into the first data cell.