US PATENT SUBCLASS 477 / 127
.~.~.~ Shift valve control

Current as of: June, 1999
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477 /   HD   INTERRELATED POWER DELIVERY CONTROLS, INCLUDING ENGINE CONTROL

34  DF  TRANSMISSION CONTROL {15}
115  DF  .~ Transmission controlled by engine {4}
121  DF  .~.~ By input manifold pressure or engine fuel control {6}
127.~.~.~ Shift valve control {5}
128  DF  .~.~.~.~> Hysteresis {1}
130  DF  .~.~.~.~> Plural shift valves {3}
138  DF  .~.~.~.~> Electric control {1}
140  DF  .~.~.~.~> Downshift control {1}
142  DF  .~.~.~.~> Selector valve overrule

DEFINITION

Classification: 477/127

Shift valve control:

(under subclass 121) Subject matter wherein a reciprocating valve is effective to trigger the actuation of a speed ratio* change in the gear transmission* said valve being regulated by a signal responsive to the input manifold pressure or engine fuel control.

(1) Note. Usually the valve is controlled by both an engine signal and vehicle speed responsive signal.