Aisin Aw Co., Ltd.

Masaki Nishide

Tomomi Ishikawa

Masatoshi Taguchi

Tsunekazu Inakura

Shoji Fushimi

Tatsuya Oba

Shinichiro Murakami

Masaaki Nishida

Hiroshi Tsutsui

Yutaka Teraoka

Kouichi Kojima

Shin-ichirou Murakami

Yukio Sugiura

Tatsuya Sahashi

Keisuke Umenaka

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 including a neutral control unit that executes neutral control for bringing the automatic transmission into a neutral state by reducing an engagement force for an engaged frictional engagement element; a speed ratio specifying unit that specifies an actual speed ratio of the automatic transmission on the basis of a rotating speed of an input shaft and a rotating speed of an output shaft; and a first failure determination unit that determines whether or not a failure is occurring in the automatic transmission on the basis of the actual speed ratio during execution of the neutral control. The first failure determination unit determines that a failure is occurring in the automatic transmission in the case where the actual speed ratio coincides with the speed ratio of any one of a plurality of shift speeds over a predetermined time.

Control device for automatic transmission and control program for automatic transmission

In an operation of controlling an automatic transmission, an engagement pressure for each hydraulic servo in a normal operation is determined so that none of friction engagement elements slips at each shift speed in the normal operation, and so that in case of a failure in which the friction engagement element that is supposed to be disengaged in the normal operation is engaged, one of the friction engagement elements slips, and thus one of the shift speeds is established. In the control operation, upon detection of a failure state in which a gear ratio after a shift operation is a gear ratio of a shift speed different from a shift speed to be established, the slipping friction engagement element is disengaged, and the shift speed that is different from the shift speed to be established is temporarily retained.

Control apparatus for automatic transmission and control method thereof

A control system for an automatic transmission that does not require a cut-off valve, and that can inhibit a reverse control even if a detection unit for detecting a shift range fails. The control system includes a first friction engagement element, which is engaged in predetermined forward and reverse shift speeds, a detection unit that detects a shift range from shift ranges that include a forward range and a reverse range; a failure judgment unit for judging failure of the detection unit, and an avoidance unit for shifting to a forward shift speed that does not engage the first friction engagement element if the failure judgment unit determines that the detection unit has failed.

Control system for automatic transmission

A control apparatus for an automatic transmission including an automatic speed change mechanism that has an input shaft connected to a drive source, an output shaft connected to driving wheels, and a plurality of friction engagement elements, and that performs a shifting operation among a plurality of shift speeds by changing engagement/disengagement states of the plurality of friction engagement elements.

Control apparatus for automatic transmission

A lock-up control apparatus for an automatic transmission in which operations of four engagement elements are required when shifting is performed from a first shift speed to a second shift speed, the first shift speed being achieved by engagement of a first engagement element and a second engagement element, the second shift speed being achieved by engagement of a third engagement element and a fourth engagement element. The lock-up control apparatus includes a lock-up control unit that performs a control for bringing a lock-up clutch into one of a disengagement state and a slip state at a start of shifting, and that prevents reengagement of the lock-up clutch at a completion of engagement of the third engagement element when shifting is performed from the first shift speed to the second shift speed during lock up.

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Okazaki, Japan

Masaki Nishide