Controlling exhaust gas recirculation in a pressure boosted inte

Details Controlling exhaust gas recirculation in a pressure boosted inte Controlling exhaust gas recirculation in a pressure boosted inte

1991-09-09

1992-11-17

Wolfe, Willis R.

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

With supercharging means for engine

123568, F02M 2507

Patent

active

051632950

ABSTRACT:
A controller and method for controlling EGR in a pressure boosted engine. A valve seat is provided in the EGR passage and a hollow actuator rod is moved by a pressure-responsive diaphragm to control flow. The diaphragm senses boost inlet pressure in a chamber supplied through a port in the rod which extends through the boost air inlet passage. In another embodiment a restrictor valve is provided in the exhaust pipe downstream of the EGR passage. The valve is closed at idle to divert exhaust to the EGR passage. As boost pressure increases, a separate pressure tap supplies a second pressure-responsive diaphragm to open the restrictor valve.

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