Transmission control system of automatic transmission for...

Details Transmission control system of automatic transmission for... Transmission control system of automatic transmission for...

2005-08-09

2005-08-09

Lewis, Tisha (Department: 3681)

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

C477S070000, C477S180000, C477S181000, C701S054000, C701S062000, C701S067000

Reexamination Certificate

active

06926640

ABSTRACT:
A transmission control system, includes:1) a high speed side friction element for establishing a high speed side change gear; and2) a low speed side friction element for establishing a low speed side change gear.After a disengagement of the high speed side friction element, the low speed side friction element makes an engagement for carrying out a downshift from the high speed side change gear to the low speed side change gear.When the downshift is carried out with an accelerator turned off,a stepping on the accelerator sensed in a period between the following times:i) a time for commanding a start of a transmission, andii) a time for the low speed side friction element to start a conveyance of a torque,prevents a changeover to the low speed side change gear, thus keeping the high speed side change gear.

REFERENCES:
patent: 4922424 (1990-05-01), Hiramatsu
patent: 5445579 (1995-08-01), Fujita et al.
patent: 5888170 (1999-03-01), Takiguchi et al.
patent: 6712735 (2004-03-01), Hayabuchi et al.
patent: 2004/0053744 (2004-03-01), Sugimura
patent: 1 188 963 (2002-03-01), None
patent: 3097339 (2000-08-01), None

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