Control system of automotive automatic transmission

Details Control system of automotive automatic transmission Control system of automotive automatic transmission

1998-09-04

2000-08-22

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477 63, 477174, F16H 6100, F16H 6158, B60K 4102

Patent

active

061064335

ABSTRACT:
A motor vehicle includes an internal combustion engine and an automatic transmission powered by the engine. The engine has a throttle valve for controlling the amount of air fed thereto. The transmission selectively assumes an Over-drive possible D-range wherein both a lock-up ON condition and a lock-up OFF condition are available and an Over-drive impossible D-range wherein only the lock-up OFF condition is kept. A control system comprises a first section for detecting a first condition of the engine wherein an open degree of the throttle valve is reduced to a certain degree; a second section for detecting a second condition of the transmission wherein the lock-up ON condition of the Over-drive possible D-range is kept; and a third section for engaging a friction element of the transmission to induce an engine brake when the first and second sections detect the first and second conditions respectively.

REFERENCES:
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patent: 5787379 (1998-07-01), Ochiai et al.
patent: 5807209 (1998-09-01), Matsubara et al.
patent: 5816979 (1998-10-01), Shiiba et al.

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