Transmission shift control strategy

Details Transmission shift control strategy Transmission shift control strategy

1997-03-03

1998-07-28

Wright, Dirk

Machine element or mechanism

Gearing

Interchangeably locked

477 97, F16H 5972

Patent

active

057849170

ABSTRACT:
A shift control strategy is provided for an automatic transmission used in a machine that is started or operated with cold oil in the transmission. When the operating value of the oil in the transmission is below a predetermined level, as sensed by a temperature sensor or a viscosity sensor, a controller turns on an indicator lamp. When a shift lever is moved from the neutral position or moved to select a different direction of travel, the controller detects the amount of time the shift lever has been in the neutral position or out of the one direction of travel and compares the amount of time to a predetermined amount of time. If the amount of time is less than the predetermined amount of time, the controller flashes the indicator lamp, inhibits the engagement of the clutches for the desired gear ratio or new travel direction, and requires the shift lever be moved back to the neutral position.

REFERENCES:
patent: 4678069 (1987-07-01), Yoshimura et al.
patent: 5069084 (1991-12-01), Matsunu et al.
patent: 5520593 (1996-05-01), Yesel et al.
patent: 5587905 (1996-12-01), Yesel et al.

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