Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1994-06-29
1996-05-21
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477 98, 477158, 477175, F16H 6126
Patent
active
055184685
ABSTRACT:
A technique for controlling the rate of engagement of a friction element in response to a commanded change in operating range of an automatic transmission. Hydraulic pressure at a blip magnitude fills the hydraulic cylinder of a friction element. The pressure magnitude at the base of a pressure ramp and a magnitude at the top of the ramp are calibrated over a range of transmission oil temperature for each type of range change required by the vehicle operator. The calibrations minimize the length of engagement and produce a smooth engagement. Execution of an algorithm produces a high level of pressure magnitude on the basis of these calibrated values, a step down at the base of a ramp, a rate of increase during the period of engagement, and a maximum pressure at the top of the ramp.
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Kropf Timothy J.
Sametz Ernest S.
Schock Eileen A.
Ford Motor Company
Kwon Peter
Marmor Charles A.
May Roger L.
McKenzie Frank G.
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