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research-article

Real-Time Processing of Engine Acoustic Emission for Diesel Injectors Diagnostic and Recentering

[+] Author and Article Information
Ponti Fabrizio

University of Bologna, Via Fontanelle 40, Forli, 47121 Italy
fabrizio.ponti@unibo.it

Ravaglioli Vittorio

University of Bologna, Via Fontanelle 40, Forli, 47121 Italy
vittorio.ravaglioli2@unibo.it

De Cesare Matteo

Magneti Marelli Powertrain S.p.a., via del Timavo 33, Bologna, 40131 Italy
matteo.decesare@magnetimarelli.com

1Corresponding author.

ASME doi:10.1115/1.4039751 History: Received February 25, 2018; Revised February 25, 2018

Abstract

Diesel engine control strategies use complex injection patterns which are designed to meet the increasing request for engine-out emissions and fuel consumption reduction. As a result of the large number of tuneable injection parameters in modern injection systems, injection patterns can be designed with many degrees of freedom. Each variation of the injection parameters modifies the whole combustion process and, consequently, engine-out emissions. Aging of the injection system affects injection location within the cycle as well as the amount of injected fuel, especially for small pre-injections. Since Diesel combustion is very sensitive to injection pattern variations, aging of injectors strongly affects engine behavior, both in terms of efficiency and pollutant emissions production. Moreover, such variations greatly affect other quantities related to the effectiveness of the combustion process, such as noise radiated. This work analyses the effects of pre-injection variations on combustion, pollutant emissions and noise radiated by the engine. In particular, several experimental tests were run on a 1.3L Common Rail Diesel engine varying the amount of fuel injected in pre-injections. Torque delivered by the engine and center of combustion (MFB50) were kept constant using a specifically designed closed-loop combustion controller. During the tests, noise radiated by the engine was measured by properly processing the signal coming from a microphone faced to the engine block. The investigation of the correlation between the combustion process and engine noise can be used to set up a closed-loop algorithm for detecting and recentering injectors' drifts.

Copyright (c) 2018 by ASME
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