Exhaust gas recirculation electric actuation technology

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Exhaust gas recirculation electric actuation technology

Pintauro, Art

Exhaust gas recirculation (EGR) is an effective method to reduce nitrogen oxide (NO(x)) emissions. There are many advantages to using electric actuation technology for both metering EGR flow and for waste gate control but this has been a challenge for the heavy industrial engine market without using active cooling because of the exhaust gas temperatures as high as 750 deg C. The paper gives a general overview of an integrated package comprising of a valve, rotary electric actuator, linkage, support bracket, and actuation technology that solves this issue. The system characteristics, technical data, models, as well as field life test data are included. The modulating actuator relies on only passive cooling due to its high ambient temperature rating as well as having a unique linkage/bracket that is designed for minimal heat transfer while allowing for relative motion due to thermal expansion. This EGR electric actuation system allows for precise metering control while simplifying the final installation as no customer supplied linkage is required and the valve to actuator position is pre-set at the factory. In addition, the actuator system has been designed to be mounted directly on engine and has the ability to withstand the associated vibration and thermal loads through the use of a vibration isolation for the integral electronics. The demonstrated vibration isolation profiles are detailed in the paper's results.