Vorrichtung zum Steuern eines automatischen Stufengetriebes

摘要

The present invention relates to an adaptive correction of servo activating hydraulic fluid pressure during shift. In one embodiment according to the present invention, a ratio of a mass airflow rate of intake air admitted to an engine (Qa) to a revolution speed of a transmission output shaft (No) is calculated, and a first parameter (TqSEN) is determined in response to the ratio (Qa/No). Besides, a second parameter (No) is the transmission output shaft speed (No). The servo activating hydraulic fluid pressure is determined in response to this first and second parameters. In another embodiment, a turbine shaft speed (Nt) is calculated from the output shaft speed (No) and a gear ratio (g) of a gear position established before shifting. The turbine shaft revolution speed (Nt) is used instead of the output shaft speed (No) in determining the first parameter (TqSEN).