Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2006-02-28
2006-02-28
Marmor, Charles A. (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C475S123000, C475S128000, C477S149000, C477S155000, C477S160000, C192S003580
Reexamination Certificate
active
07004872
ABSTRACT:
A control method for an automatic transmission is capable of quickly determining whether gear shifting is permissive. The control method varies the command value input to an engaging-side electromagnetic valve that adjusts a hydraulic pressure applied to a frictional element to be engaged in a target gear in a specific time period, then determines a time variation in another time period of the hydraulic pressure applied to the frictional element that is adjusted by the engaging-side electromagnetic valve according to the input command value and detected by a detecting means. Determination of whether gear shifting is permissive or not on the basis of the time variation is thus determined.
REFERENCES:
patent: 4845618 (1989-07-01), Narita
patent: 4942787 (1990-07-01), Aoki et al.
patent: 4955256 (1990-09-01), Kashihara et al.
patent: 5086670 (1992-02-01), Nitz et al.
patent: 5251509 (1993-10-01), Pollack et al.
patent: 5790967 (1998-08-01), Kull et al.
patent: 1-224549 (1989-09-01), None
Suzuki Fuminori
Takagi Akira
Denso Corporation
Le David D.
Marmor Charles A.
Nixon & Vanderhye P.C.
LandOfFree
Control method and device 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 Control method and device for automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control method and device for automatic transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3692253