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01/09/2007
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A new design of diesel EGR valve has a motor actuator combined with a drive system, said to be unique, that provides fast response, resistance to exhaust contaminations and packaging flexibility all within a smaller envelope.
BorgWarner says its DEGR valve can be used in both hot-side and cold-side applications, as well as in single or dual poppet systems. It can be easily combined with an EGR cooler and cooler bypass valve. The durability of the system is also improved by the robust anti-contamination features, which include seals and a stem scraper.
The unit uses a DC motor-driven two-stage gear actuator and a drive mechanism that converts rotary motion into axial valve movement. The ECU sends a signal to the DC motor which then positions the valve to deliver the desired exhaust gas flow.
The valve’s non-contacting position sensor sends a feedback signal to the ECU that is used to indicate EGR flow and maintain the valve position. The recirculated exhaust gas, combined with the air-fuel mixture, limits the peak combustion temperature and reduces the formation of NOx.
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Author
Roger Bishop
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