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Sloped Controller Description
The sloped controller is designed to maintain the
rated compressor discharge (deck) pressure at wide-
open throttle, to reduce the deck pressure at wide-
open throttle, and to reduce deck pressure at part
throttle settings. A diaphragm, coupled with a
spring-supported bellows for absolute pressure
reference, is exposed to deck pressure and intake
manifold pressure through ports located before and
after the throttle, respectively.
This arrangement
FIGURE 7-4. SLOPED CONTROLLER
constantly monitors deck pressure, and the pressure
differential between the deck and manifold pressure
due to a partially closed throttle. If either the deck
pressure or throttle differential pressure rises, the
controller poppet opens, increasing oil flow,
allowing the wastegate butterfly to open, decreasing
turbocharger compressor discharge (deck) pressure.
The sloped controller is more sensitive to the throttle
differential pressure than to deck pressure, thereby
accomplishing deck pressure reduction as
the throttle is closed.
Exhaust
7-7
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