An automatic transmission including a torque converter and a multiple stage transmission gear mechanism. A hydraulically actuated brake and a hydraulically actuated clutch is provided for alternate engagement to select alternately one of two adjacent gear stages. In order to prevent gear shift shock, the engaging of the clutch or the brake is controlled so that the engaging rate is faster for a predetermined time period in an initial period of a gear shifting operation than in a remainder period. A control circuit is provided to monitor the gear shifting operation and modifying the predetermined time period in accordance with the results of the latest gear shifting operation and store the modified value for the use in a next gear shifting operation.
申请公布号
US4942530(A)
申请公布日期
1990.07.17
申请号
US19880162642
申请日期
1988.03.01
申请人
MAZDA MOTOR CORPORATION;JAPAN AUTOMATIC TRANSMISSION CO., LTD.