Continuously variable hydrostatic transmission including a pulse width modulation ratio controller
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United States of America Patent
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Jul 30, 1996
Grant Date -
N/A
app pub date -
Jan 30, 1995
filing date -
Jan 30, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A controller for changing the ratio of a continuously variable hydrostatic transmission, as determined by the angular position of a swashplate, including an actuator having a cylinder slidingly receiving a piston to define a pair of chambers. A pair of solenoid valves, each configured to connect a respective chamber selectively to sump pump pressure or atmospheric pressure, are energized with a stream of pulses to create differential fluid pressures in the chambers, thereby producing movement of the piston; the piston movement being linked to the swashplate to produce a corresponding adjustment of the swashplate angular position. The rate of change of the swashplate angular position is controlled by pulse width modulating the pulse stream.
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