Process and apparatus for realizing safe start-up shifting and e

Details Process and apparatus for realizing safe start-up shifting and e Process and apparatus for realizing safe start-up shifting and e

1988-01-21

1990-01-02

Gruber, Felix D.

Boots, shoes, and leggings

74865, 74866, B60K 4118, F16H 540

Patent

active

048917583

ABSTRACT:
A control system for an automatic transmission, which prevents start-up shifting unless safe conditions exist. Sensors detect engine speed, vehicle speed, shift selection, and throttle position. For start-up shifting to be enabled, engine speed must be at idle, vehicle speed near zero, a start-gear selected, and the throttle initially at rest. Thereafter, displacement of the throttle from its rest position enables a shift command to be forwarded to the transmission to effectuate the shift selection. In a further embodiment, start-up shifting with the vehicle in motion is enabled, provided the direction of motion is consistent with the start-up gear selection. When the throttle is released, with the vehicle in motion, the transmission shift control is disabled, shifting the transmission into "neutral", when vehicle speed drops below a predetermined level, allowing the vehicle to free wheel, without being dragged forward by the idling engine.

REFERENCES:
patent: 4509625 (1985-04-01), Tellert
patent: 4526065 (1985-07-01), Rosen et al.
patent: 4618042 (1986-10-01), Yamamoto
patent: 4633985 (1987-01-01), Leorat
patent: 4637278 (1987-01-01), Nishikawa et al.
patent: 4643048 (1987-02-01), Hattori et al.
patent: 4653622 (1987-03-01), Miyake
patent: 4709792 (1987-12-01), Sakai et al.

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