Patent ID: 9625030
Date: 2017-04-18
CPC Classifications: F16D,F16H

Claim:
1. An automatic transmission controller for an automatic transmission provided with a frictional engagement member, wherein the frictional engagement member is configured to be operated by hydraulic pressure for shifting the automatic transmission, and includes an air vent opening, the automatic transmission controller comprising: a pressure regulator configured to regulate the hydraulic pressure in response to a hydraulic pressure control signal; and a control section configured to set the hydraulic pressure control signal, and perform an air vent operation of venting air from the frictional engagement member through the air vent opening, wherein the air vent operation includes: the normal operation comprises a second operation of setting of the hydraulic pressure control signal to a second pulse indicative of the second value, wherein the second pulse is immediately subsequent to the preliminary pulse, and wherein the air vent operation is implemented by setting the hydraulic pressure control signal to pulses constant with time after the preliminary pulse.