Downshift control for automotive automatic transmission

Details Downshift control for automotive automatic transmission Downshift control for automotive automatic transmission

2007-10-23

2007-10-23

Estremsky, Sherry (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

C477S101000, C477S118000, C477S906000

Reexamination Certificate

active

11207195

ABSTRACT:
An automotive automatic transmission control apparatus is provided which works to increase the power of an engine in response to a request to down-shift the gear of an automatic transmission for developing the engine braking. The control apparatus includes a fail-safe circuit working to stop increasing the power of the engine when a defect in operation of a transmission hydraulic control circuit is detected after the hydraulic control circuit starts to control the hydraulic pressures to achieve the downshift of the automatic transmission. This eliminates or alleviates a problem, such as unwanted acceleration of the vehicle during the control of the downshift in the transmission.

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U.S. Appl. No. 11/114,052, filed Apr. 26, 2005.
U.S. Appl. No. 11/108,891, filed Apr. 19, 2005.

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