A Fully Physical Correlation for Low Pressure EGR Control Linearization

Paper #:
  • 2017-24-0011

Published:
  • 2017-09-04
Abstract:
Nowadays stringent emission regulations are fostering the diffusion of air management strategies like LowPressure-EGR and HighPressure/ LowPressure mix both for passenger car and heavy duty applications, increasing the engine control complexity. Within a project in collaboration with Kohler Engines, Ricardo and Denso to exploit the potential of EGR-Only technologies to meet the TIER IV and beyond emission standard, a 3.4 liters KDI 3404 was equipped with a two stage turbocharging system, an extremely high pressure FIS and a low pressure EGR system. The LP EGR system works in a closed loop control with an intake lambda sensor actuating two valves: an EGR valve placed downstream of the EGR cooler that regulates the flow area of the bypass between the exhaust line and the intake line, and an exhaust flap to generate enough backpressure to recirculate the needed EGR rate to cut the NOx emission without a specific aftertreatment device. In this paper will be demonstrated how, using a 1D-CFD code to characterize the flow in the exhaust line and in the EGR pathway, together with simple physical correlations, it is possible to define the opening laws of the two valves in order to obtain a linear response of the control in terms of EGR rate, minimizing the fuel consumption penalty due to the backpressure valve.
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