Jatco Corporation

Unipres Corporation

Akimasa Mori

Hiroaki Ono

Two-speed transmission apparatus for electric vehicle comprises a planetary gear mechanism, friction brakeand friction clutchin coaxial arrangement between input axisand output axis, first speed is obtained by fastening the friction brakeand one-on-one second speed is obtained by fastening friction clutch. The electric actuatorto switch first speed and second speed comprises electric motor, a torque-thrust converting mechanismand pusher. The torque-thrust converting mechanismcomprises inside cylindrical screwbeing rotated by control motorand outside cylindrical nutwhich is screwed with cylindrical screwand is connected to pusherso as to integrally axis-move. The control motormay include an electromagnetic brake to fasten the friction brakeand the friction clutch. Thrust of the axial direction may be transmitted by the swing of an arm

Two-speed transmission apparatus for electric vehicle

It is detected on the basis of a change in an engine speed whether an out-of shelf condition in which a gear shft time exceeds a predetermined time is caused or not (step S11), and when the out-of shelf condition is caused, a lapping control processing corresponding to first engaging oil pressure setting means is executed so that a correction value is set to increase a line pressure supplied to each kind of engaging elements of an automatic transmission, and that the correction value is decreased as a gear shft load time elapses. At the same time, a learning control processing corresponding to a second engaging oil pressure setting means is executed (step S17) so that a variation of the engaging oil pressure due to the non-uniformity of engaging elements and the deterioration with age is learned, thereby to enable to automatically act a proper line pressure on each kind of engaging elements when either one of the automatic transmission or a controller which controls the automatic transmission is replaced.

Gear shift time automatic adjusting apparatus in automatic transmission

An automatic power transmission assembled with a torque converter includes a lock-up mechanism for controlling the automatic power transmission with detecting a state of progress of a shifting operation in the automatic power transmission. A driving torque of an engine is temporarily lowered at a timing in the vicinity of completion of the shifting operation. The timing is determined by calculating data indicative of the state of progress of the shifting operation of the automatic power transmission on the basis of the result of a ratio value, which is determined by multiplying a transmission gear ratio (Gn) at a transmission speed range of the automatic power transmission after shifting with a rotation speed (Np) of an output shaft of the automatic power transmission and dividing the result by a revolution speed (Ne) of an engine connected to the torque converter detecting a state of the lock-up mechanism between a lock-up state and a non-lock-up state, modifying shifting timing indicative reference data depending upon the state of the lock-up mechanism and detecting the timing when the calculated data reaches the reference data.

Method and system for controlling automatic power transmission

An automatic transmission control unit switches on and off operations for a plurality of solenoids in response to combinations of throttle openings estimated on the basis of an output of a throttle sensor and vehicle speeds estimated on the basis of an output of a vehicle speed sensor to set a proper speed change gear. The automatic control unit sets second gear when a vehicle is stopped to suppress creep during the stoppage of the vehicle, and starts the vehicle with the second gear as it is when the changing rate of the throttle opening is small. When the changing rate of the throttle opening exceeds a predetermined rate in an acceleration state, it is determined that an operator desires powerful acceleration and hence the operation is shifted to first gear. In contrast, when the operator requires a slow start, a second gear start is automatically selected without permitting down-shift to the first gear every time the vehicle is started.

Start controller for automatic transmission

A control system for controlling an automotive automatic transmission which comprises a friction element operated by a hydraulic pressure. The control system comprises a first device for judging whether a gear change of the transmission is necessary or not in accordance with the running condition of the vehicle; a second device for lowering the hydraulic pressure when the first device judges a necessity of the gear change; a third device for increasing the hydraulic pressure when a difference between the maximum engine speed appearing after starting of gear change operation and a current engine speed is greater than a predetermined degree; and a fourth device for increasing the hydraulic pressure when a predetermined time passes from the time when the first device has judged the necessity of the gear change irrespective of operation of the third device.

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Fuji, Japan

Akimasa Mori