Exhaust gas recirculation control

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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F02M 2506

Patent

active

041800346

ABSTRACT:
A transducer creates an operating pressure that positions a control valve to provide exhaust gas recirculation at rates which maintain the control pressure in the recirculation passage between the valve and an orifice equal to a reference pressure; exhaust gas recirculation thus varies with engine exhaust backpressure and accordingly is substantially proportional to induction air flow. The transducer also varies the reference pressure inversely with exhaust backpressure, thereby causing a reduction in the control pressure and a corresponding increase in the proportion of exhaust gas recirculation to induction air flow upon an increase in induction air flow.

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