Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1992-10-30
1995-03-28
Bonck, Rodney H.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
192 358, 477120, 477127, 477128, 477129, B60K 4106
Patent
active
054006783
ABSTRACT:
A method is provided for use in a vehicle including an automatic transmission having at least one load carrying friction element, such as clutch, of optimizing the line pressure in the transmission by slipping the weakest friction element by a small amount. The method includes the steps of decreasing the line pressure from a predetermined base pressure to allow for incipient slip across the weakest friction element and then increasing the line pressure to obtain a temporary pressure at which the weakest friction element is no longer slipping. The method also includes the step of further increasing the line pressure from the temporary pressure to obtain an operating line pressure. Preferably, the operating line pressure provides the weakest friction element with additional capacity for transmitting torque without slip for normal driving conditions, i.e. sensed vehicle throttle positions within a predetermined hysteresis band.
REFERENCES:
patent: 4503734 (1985-03-01), Acker
patent: 4529072 (1985-07-01), Oguma et al.
patent: 4795011 (1989-01-01), Ushijima et al.
patent: 4805750 (1989-02-01), Nitz
patent: 4831899 (1989-05-01), Honig
patent: 4875391 (1989-10-01), Leising et al.
patent: 4958538 (1990-09-01), Yamashita et al.
patent: 4972738 (1990-11-01), Narita
patent: 5082097 (1992-01-01), Goeckner et al.
patent: 5086669 (1992-02-01), Fujiwara et al.
patent: 5111718 (1992-05-01), Iizuka
Jain Pramod K.
Paredes Andrew
Bonck Rodney H.
Ford Motor Company
May Roger L.
McKenzie Frank G.
Wittels Daniel
LandOfFree
Line pressure optimization in an 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 Line pressure optimization in an automatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line pressure optimization in an automatic transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2243501