Experimental validation of a virtual engine-out NOx sensor for diesel emission control

摘要

Motivated by automotive emission legislations, a Virtual NOx sensor is developed. This virtual sensor consists of a real-time, phenomenological model that computes engine-out NOx by using the measured in-cylinder pressure signal from a single cylinder as its main input. The implementation is made on a Field Programmable Gate Array-Central Processing Unit architecture to ensure the NOx computation is ready at the end of the combustion cycle. The Virtual NOx sensor is tested and validated on an EURO-VI Heavy-Duty Diesel engine platform. The Virtual NOx sensor is proven to meet the accuracy of a production NOx sensor for steady-state conditions and has better frequency response compared to the production NOx sensor.