Automatic transmission control system having a neutral idle feature
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United States of America Patent
Stats
-
Jan 9, 2001
Grant Date -
N/A
app pub date -
Oct 1, 1999
filing date -
Oct 1, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronically controlled automatic transmission hydraulic valve system for an automotive vehicle transmission having multiple forward-drive ratios and a reverse ratio. Clutch and brake means controls motion of gearing elements for establishing forward torque flow paths and a reverse torque flow path, the clutch and brake means including a reverse drive clutch and a forward drive clutch. Each clutch, when engaged, completes a torque flow path from a vehicle engine to torque input elements of the gearing. The forward clutch and reverse clutch each includes friction elements that are frictionally engaged by a pressure-actuated piston. Regulated pressure strokes each piston. An engagement valve system triggers normal forward clutch and reverse clutch operation during torque delivery and for establishing a neutral idle capability in both forward and reverse.
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