Aisin Aw Co., Ltd.

Shoji Fushimi

Masatoshi Taguchi

Tsunekazu Inakura

Tomomi Ishikawa

Masaki Nishide

Yasuhito Suzuki

Ryo Takada

A control device for a transmission including m (m&#x2267;3) solenoid valves and configured to establish a plurality of shift speeds by engaging n1 (2&#x2266;n1&#x3c;m) engagement elements using hydraulic pressures of n1 solenoid valves among the m solenoid valves. A current threshold setting unit sets respective currents to be applied to solenoids of n2 (n1&#x3c;n2&#x2266;m) solenoid valves corresponding to n2 engagement elements at the time when braking torque acts on an output shaft of the transmission with the n2 engagement elements engaged as current thresholds. A determination unit determines whether or not braking torque is generated on the output shaft of the transmission by comparing respective current values to be applied to the solenoids of the n2 solenoid valves and the set current thresholds corresponding to the solenoids of the n2 solenoid valves.

Control device for transmission and braking torque generating determination method for transmission

A control device for a transmission including m (m&#x2267;3) solenoid valves and configured to establish a plurality of shift speeds by engaging n1 (2&#x2266;n1&#x3c;m) engagement elements using hydraulic pressures of n1 solenoid valves among the m solenoid valves, the control device. The control device having an actual current value detection unit that detects respective values of actual currents flowing through solenoids of the m solenoid valves; and a determination unit that determines whether or not braking torque is generated on an output shaft of the transmission by comparing the detected actual current values for solenoids of n2 (n1&#x3c;n2&#x2266;m) solenoid valves and a current threshold.

Control device for transmission and braking torque generation determination method for transmission

A control device for an automatic transmission. The control device configured to determine if the automatic transmission is in such a condition that the automatic transmission accelerates the vehicle at predetermined acceleration when the output command value is transmitted to the control device for the motor. The output command value is not cancelled if it is determined by the determining means that the automatic transmission is not in such a condition that the automatic transmission accelerates the vehicle at the predetermined acceleration, and the output command value is cancelled if it is determined by the determining means that the automatic transmission is in such a condition that the automatic transmission accelerates the vehicle at the predetermined acceleration.

Control device and control method for automatic transmission

An automatic shift apparatus including a transmission; a vehicle speed acquisition unit; a gear speed acquisition unit that acquires a gear speed of the transmission; a unit that sets, based on a vehicle speed, a minimum allowable gear speed at which a rotation speed of an input shaft of the transmission is equal to or lower than a predetermined rotation speed and which has a highest gear ratio among a plurality of gear speeds; and a unit that determines that the gear speed is abnormal if the gear speed has a higher gear ratio than the minimum allowable gear speed due to a change in the gear speed, and not determining that the gear speed is abnormal if the gear speed has a higher gear ratio than the minimum allowable gear speed due to a change in the minimum allowable gear speed that is set.

Growing community of inventors

Ichinomiya, Japan

Shoji Fushimi