GEAR CHANGE CONTROL UNIT OF AUTOMATIC TRANSMISSION FOR VEHICLE

Japanese Patent JP3303700

B2

PROBLEM TO BE SOLVED: To prevent the multiple gear change by preventing the gear change to a B shift stage, and substantially performing A→C gear change, by performing the gear change from the B shift stage to a C shift stage while limiting the oil pressure of a frictional engagement unit by less than a prescribed value, when the command for the gear change to the C shift stage is output during the gear change from an A shift stage to the B shift stage.
SOLUTION: When a 1→2 gear change (A-B gear change) command is output, whether the command of gear change to the third shift stage (C speed) is output or not, is judged in ECU for speed change 78, so that the exciting condition of the electromagnetic valves S1-S3 is switched to obtain the second shift stage, when the judgement is NO, and a corresponding brake B3 is engaged by controlling the oil pressure of a linear solenoid value SLU. On the other hand, when the judgement is YES, the ordinary 2→3 gear change is executed when an accelerating pedal 50 is not stopped on, but when the accelerating pedal 50 is stopped on, the oil pressure of the brake B3 is limited to be less than the comparatively low certain oil pressure free from the engagement of the brake B3, and the 2→3 gear change is executed.

JP5139353	Hydraulic control device for automatic transmission
JP2576025	[Name of invention] Shift lever device
JP4946217	Spool valve

Toshiya Oishi
Nobuaki Takahashi
Yasuya Nakamura

JP34750296A

July 22, 2002

December 26, 1996

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TOYOTA JIDOSHA KABUSHIKI KAISHA

F16H61/00; F16H61/06; (IPC1-7): F16H61/06

JP6346959A
JP1089469A

Haruyuki Ikeda (2 outside)

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