Downshift control for automatic transmission

Details Downshift control for automatic transmission Downshift control for automatic transmission

1990-02-28

1992-02-04

Herrmann, Allan D.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, B60K 4106

Patent

active

050851055

ABSTRACT:
A downshift control in an automatic transmission is disclosed wherein magnitude of servo activating hydraulic fluid pressure is temporarily decreased as a function of vehicle speed when the automatic transmission effects a downshift from a current gear ratio to a new gear ratio. Owing to this arrangement, a fluid operated frictional device associated with the current gear ratio is released quickly without any lag to allow quick increase in engine speed during the downshift with the throttle fully opened at a high vehicle speed, i.e., a power-on downshift at high vehicle speed.

REFERENCES:
patent: 4200175 (1980-04-01), Dick
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4697479 (1987-10-01), Hayakawa et al.
patent: 4730519 (1988-03-01), Nakamura et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4807496 (1989-02-01), Hayasaki et al.
patent: 4890515 (1990-01-01), Taniguchi et al.
Service Manual for Automatic Transmission of the RE4R01A Type (A261C07), Nissan Motor Company Limited, Mar. 1987.

Affiliated with

Also associated with

Rating

Downshift control for automatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Downshift control for automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downshift control for automatic transmission will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-341611