Ratio change control system for multiple ratio transmission

Details Ratio change control system for multiple ratio transmission Ratio change control system for multiple ratio transmission

1999-02-19

2000-06-13

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475123, F16H 6106

Patent

active

060743190

ABSTRACT:
An automatic control system for a multiple ratio transmission includes an electronically controlled variable orifice configuration within a discharge circuit for a downshift control system from a high speed ratio to an intermediate speed ratio. The variable orifice configuration divides the discharge circuit into an upstream part communicating with an accumulator chamber of an accumulator and an intermediate brake release pressure chamber defined by a double acting piston of an intermediate ratio brake servo, and a downstream part communicating with a high speed ratio clutch. A calibrated flow control orifice is disposed in the discharge circuit to control discharge flow of oil from said downstream part. A transmission controller reduces the variable orifice configuration to provide a reduced orifice size during inertia phase of the downshift.

REFERENCES:
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4709596 (1987-12-01), Boda
patent: 4754403 (1988-06-01), Hiramatsu
patent: 5758302 (1998-05-01), Schulz et al.
patent: 5772550 (1998-06-01), Kamada et al.
patent: 5899831 (1999-05-01), Takiguchi

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