Amt off-highway downshift logic

Details Amt off-highway downshift logic Amt off-highway downshift logic

1988-04-18

1989-07-25

Lall, Parshotam S.

Boots, shoes, and leggings

74866, B60K 4118, G06F 1520

Patent

active

048520063

ABSTRACT:
An improved control system and method for an automatic transmission system (10) including an automatic change gear transmission (12) driven by a throttle (26) controlled engine (14) is provided. The control system includes a processing unit (42) for receiving inputs indicating at least throttle position (THL) and vehicle speed (OS), for determining vehicle acceleration/deceleration (dOS/dt) and for processing these inputs in accordance with a program or logic rules to determine the selected engaged gear ratio and for issuing command signals to transmission system shifting mechanisms (34 and 30). The processing unit includes an operator selected (DOR) set of logic rules by which vehicle performance is maximized and the control will evaluate downshifts at assumed constant vehicle deceleration for a period of time (T) greater than the time required for a single downshift and command a downshift to the lowest gear ratio under the calculated conditions.

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