192 clutches and power-stop control – Field responsive frictional media type
Reexamination Certificate
2007-12-25
2007-12-25
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Field responsive frictional media type
C123S041120, C192S058670, C192S08200T, C192S113210
Reexamination Certificate
active
11227310
ABSTRACT:
The present invention provides a method of controlling thermal energy within a fan drive. The fan drive includes an input member rotating at an input speed, and an output member attached to the fan and rotating at a fan speed, with a viscous fluid disposed therebetween. The fluid selectively transmits torque between the input member and the output member such that the fan speed is a function of a controllable parameter of the fluid. The parameter is continually controlled by a programmed controller. The method includes the steps of pre-determining a threshold temperature for the fan drive, with the threshold temperature approaching a maximum desirable temperature for the fan drive, and adjusting the fan speed as necessary to maintain a fan drive temperature below the threshold temperature. The controller may regulate fluid volume or fluid viscosity, or any other controllable parameter of the fluid.
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Smith Anthony L.
Usoro Patrick B.
Bonck Rodney H.
GM Global Technology Operations Inc.
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