US PATENT SUBCLASS 477 / 49
.~.~.~.~.~.~ Duty ratio control

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

34  DF  TRANSMISSION CONTROL {15}
37  DF  .~ Continuously variable friction transmission {8}
44  DF  .~.~ Belt-type {1}
45  DF  .~.~.~ Fluid pressure control {1}
46  DF  .~.~.~.~ Ratio change controlled {2}
48  DF  .~.~.~.~.~ With electric valve control {1}
49.~.~.~.~.~.~ Duty ratio control

DEFINITION

Classification: 477/49

Duty ratio control:

(under subclass 48) Subject matter wherein the electrical regulation is by pulse width modulation of on-off signals to the valve.