Patent ID: 6466854
Filing Date: 2002-10-15
Classification: F16H,Y10T

Abstract:
A method for controlling a high-temperature operating mode of an electronically controlled automatic transmission in which at least one temperature value of one of an actual engine (CMO) and a transmission (CGT) temperature is continuously measured and said actual temperature value (CMO, CGT) is compared with an upper limit value (MOMAX, GTMAX), and a special high-temperature shift program is accessed for a gear change control when the actual temperature value is higher than the upper limit value (MOMAX, GTMAX), the method comprising the steps of:storing several shift programs in an electronic control unit for gear change control; accessing one of the stored several shift programs according to an evaluation counter normally provided with a driving activity characteristic; associating a consumption-optimized shift program with a minimum value of the evaluation counter and associating a performance-optimized shift program with a maximum value of the evaluation counter; comparing the actual temperature value (CMO. CGT) with a lower smaller limit value (MOMIN; GTMIN) and, when the actual temperature (CMO, CGT) is higher than the lower limit value (MOMIN, GTMIN) and the upper limit values (MOMAX, GTMAX) still have not been reached, providing the evaluation counter with a high-temperature operating value (MAX(UDCHMMO, UDCHMGT) with which a more performance-optimized shift program, having temperature-lowering properties, is associated.