Aisin Aw Co., Ltd.

Tsuyoshi Kawamoto

Yoshihisa Yamamoto

Kazumasa Tsukamoto

Masaaki Nishida

Hiroshi Tsutsui

Akitomo Suzuki

Akira Isogai

Takayuki Kubo

Munehiro Tashiro

Shigetaka Wakisaka

Masahiro Ida

Kazufumi Ando

A system for control of the discharge pressure of an input clutch hydraulic servo at the time of a D&rarr;N shift, in which the peak value (DN_Omega_max) rate of change of the rotational speed of an input shaft increases if the initial value (DN sol Sweep Start SLT signal) of the pressure adjusting control becomes high or low. A convergence region (DN_Omega_limit_max) is provided. On the basis of comparison between the previous peak value (DN_Omega_max_ave1) and the present peak value (DN_Omega_max_ave2), and the direction of correction, the learning is performed in accordance with various maps in a direction toward the convergence region.

Hydraulic pressure control apparatus of automatic transmission

The automatic transmission of the present invention prevents fluctuation of torque transmission through a band brake. In the hydraulic operator for the band brake, a resilient elastic cushion is provided between a rod abutting one end of the band of the band brake and a piston. Any slippage between the band and drum of the band brake will result in oscillation of the rod. However, the elastic cushion absorbs oscillation of the rod, thereby isolating the piston from that oscillation.

Automatic transmission with band brake and hydraulic operator

Growing community of inventors

Anjo, Japan

Tsuyoshi Kawamoto