Aisin Aw Co., Ltd.

Masatoshi Taguchi

Tsunekazu Inakura

Shoji Fushimi

Tomomi Ishikawa

Masaki Nishide

Kenji Suzuki

Hiroshi Tsutsui

Yoichi Tajima

Masao Saito

Takehiko Suzuki

Masayuki Kuwata

Masaharu Chiba

Tomohiro Kusamizu

Minoru Kubokawa

Tetsuya Sano

Takahiro Mizumoto

Yasuhito Suzuki

Ryo Takada

Yoshiyuki Matsuda

A control device for a vehicle drive device includes performing neutral travel control in which disengagement/engagement elements are disengaged with the wheels rotating so the state of a speed change mechanism is controlled into a neutral state where transfer of a drive force between the input member to the engine and the output member to the wheels is not performed, and the wheels are driven by a rotary electric machine drive force; and comparing an operating state value of each of target actuators that control the state of the disengagement/engagement elements, and a determination value so torque from the speed change mechanism to the wheels because of torque transferred by each of the disengagement/engagement elements, falls within an allowable range during neutral travel control, and determines whether the torque transferred from the speed change mechanism to the wheels falls within the allowable range.

Control device for vehicle drive device

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 vehicle control device that includes a computer which controls an in-vehicle device provided in a vehicle. The control device can be configured with a main processing unit that performs a process for operating the in-vehicle device, and a safety function processing unit that performs a safety function process for detecting a dangerous state of the in-vehicle device which is operated according to the process performed by the main processing unit and bringing the in-vehicle device into a safe state. The safety function processing unit may include execution order monitoring means for monitoring whether an execution order of the safety function process is correct when the safety function process is performed.

Vehicle control device and method

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.

Automatic shift apparatus and method for determining transmission abnormal gear speed

A first-type data transfer frame for uncompressed transfer of a control program and control data including reference data, and a second-type data transfer frame for compressed transfer have the same fixed size, and each transfer frame includes compression identification information indicating uncompressed or compressed data. When an on-board vehicle control unit receives a transfer frame with uncompressed control data, the control unit stores the uncompressed control data of the frame in a nonvolatile memory. When the transfer frame has compressed control data, the control unit writes the compressed control data of the frame into RAM, and decompresses control data in the RAM. The control unit sequentially accumulates decompressed control data in the RAM, and when amount of the accumulated control data reaches a setting amount, the control unit halts the decompressing, and transfers the decompressed control data from the RAM into the nonvolatile memory, and restarts decompressing for the next received data transfer frame from the halt point.

Method of writing control data into on-board vehicle control unit and the control unit

A hydraulic control unit of an automatic transmission calculates deceleration during a coasting downshift, and calculates a piston play offsetting time, that is, the lag time that elapses between a shift decision and the start of the shift, on the basis of a correction value determined in accordance with the lag time learned from the previous shift. Based on the rate of deceleration and the piston play offsetting time, the downshift line in the speed shift map is corrected, that is, advanced in timing. Using this timing-advanced shift line, the control unit makes an earlier shift decision such that the shift starts in a proper state of operation, thus reducing shift shock during a coasting downshift and preventing excessive engine speed during a high-speed upshift.

Growing community of inventors

Okazaki, Japan

Masatoshi Taguchi