192 clutches and power-stop control – Transmission control and clutch control – Common control
Patent
1991-01-24
1992-01-28
Lorence, Richard
192 clutches and power-stop control
Transmission control and clutch control
Common control
192 85AA, 192106F, 74335, 3644241, B60K 4122, F16D 2514
Patent
active
050836480
ABSTRACT:
In a microprocessor controlled power shift transmission system having hydraulically actuated clutches, compensation is provided to offset the effects of centrifugal force on the fluid in the clutch piston cavity, these effects causing a variation in the response of a clutch to a clutch actuation signal. A table of compensation values is provided for each clutch which may be inched. Engine or input speed and vehicle or output speed are sensed to derive an address for addressing the table of an active clutch. The compensation value read from a table is used to modify a modulation value and the modulation value is then used to generate an actuation signal which is applied to the active clutch. If the piston cavity of a clutch is mounted on a member which is in direct drive connection with the input or output shaft of the transmission then the table is addressed by an address derived from the input speed or the output speed, respectively. If there is a further clutch between the clutch and the input shaft or output shaft, the address for addressing the table is derived from the selected gear and the input speed or output speed depending on whether the cavity rotates with an input member or an output member of the clutch.
REFERENCES:
patent: 3217851 (1965-11-01), Mogk et al.
patent: 4458797 (1984-07-01), Hawkins
patent: 4718306 (1988-01-01), Shigematsu et al.
patent: 4858495 (1989-08-01), Horsch
patent: 4989470 (1991-02-01), Bulgrien
Ford New Holland Inc.
Lorence Richard
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