Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1998-02-27
2000-02-22
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
606052, F02M 2507
Patent
active
060267917
ABSTRACT:
A control valve for an EGR system employs a variable pressure actuator connected to a valve for metering EGR flow and a differential pressure valve connected to supply actuation pressure to the actuator. The differential pressure valve incorporates a proportional solenoid connected to a pressure balancing piston which receives EGR pressure on one side and exhaust flow pressure on the other. The piston is connected to a shaft having an orifice positionable adjacent a pressure source in a first position and a pressure vent in a second position, an outlet of the orifice communicating with the pressure actuator. EGR control is accomplished by providing a signal to the proportional solenoid which shifts the pressure balance point for the piston.
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Allied-Signal Inc.
Fischer Felix L.
Wolfe Willis R.
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