Control for shift in automatic transmission

Details Control for shift in automatic transmission Control for shift in automatic transmission

1992-02-21

1994-04-19

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

74866, F16H 5916

Patent

active

053041020

ABSTRACT:
There is proposed a practical approach to a shift, in an automatic transmission, in which a release element is released and an apply element is engaged. The release element is released or vented at an appropriate timing after development of torque by the apply element but before initiation of inertia phase. Specifically, the release element is released when transmission output torque (To) reaches a value (Toh) calculated out of gear ratio after shift (grmin), transmission input (or turbine) torque (Tt) and transmission input (turbine) acceleration (NTd). If desired, without relying on measurement of output torque (To), the release element may be released when transmission output acceleration (No), namely, vehicle acceleration, reaches a value which may be fixed or accelerator position dependent.

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Leising et al., "The All-Adaptive Controls For The Chrysler Ultradrive Transaxle", Chrysler Motors Corp., 890529, pp. 45-53.
Leising et al., "Adaptive Control Strategies For Clutch-to Clutch Shifting", Chrysler Motors Co., 805048, pp. 331-339.
Service Manual, "Nissan Full-Range Electronically Controlled Automatic Transmission RE4R01A Type", (A2601C07) pp. I-53-I-73, Mar. 1987.

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