Abstract
In this paper it is shown that the oxygen concentration in the intake manifold is the most promising control variable to influence the nitrogen-oxide emissions of Diesel engines via exhaust gas recirculation. A virtual oxygen sensor for the intake manifold is presented. Further the patented IAV closed-loop control concept for the intake manifold oxygen concentration is shown. The dynamic capability and steady-state accuracy of the virtual oxygen sensor and the closed-loop oxygen control are proven by measurements from the engine test bench. Finally, the emissions reduction potential analysis shows that the closed-loop control of oxygen concentration in the intake manifold reduces the nitrogen-oxide emissions by 27 % compared with a conventional closed-loop air-mass flow control.
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