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 (such as start and duration of each injection), 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 usually affects injection location within the cycle as well as the amount of injected fuel (compared to the target value), especially for small pre-injections. Since diesel combustion is very sensitive to injection pattern variations, aging of injectors strongly affects engine behavior, in terms of both efficiency and pollutant emissions production. Moreover, such variations greatly affect other quantities related to the effectiveness of the combustion process, such as noise radiated by the engine. 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 1.3 L 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 setup a closed-loop algorithm for detecting and recentering injectors' drifts over time.
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September 2018
Research-Article
Real-Time Processing of Engine Acoustic Emission for Diesel Injectors Diagnostic and Recentering
Fabrizio Ponti,
Fabrizio Ponti
Department of Industrial Engineering (DIN),
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: fabrizio.ponti@unibo.it
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: fabrizio.ponti@unibo.it
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Vittorio Ravaglioli,
Vittorio Ravaglioli
Department of Industrial Engineering (DIN),
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: vittorio.ravaglioli2@unibo.it
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: vittorio.ravaglioli2@unibo.it
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Matteo De Cesare
Matteo De Cesare
Magneti Marelli Powertrain S.p.a.,
Via del Timavo 33,
Bologna 40131, Italy
e-mail: matteo.decesare@magnetimarelli.com
Via del Timavo 33,
Bologna 40131, Italy
e-mail: matteo.decesare@magnetimarelli.com
Search for other works by this author on:
Fabrizio Ponti
Department of Industrial Engineering (DIN),
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: fabrizio.ponti@unibo.it
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: fabrizio.ponti@unibo.it
Vittorio Ravaglioli
Department of Industrial Engineering (DIN),
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: vittorio.ravaglioli2@unibo.it
University of Bologna,
Via Fontanelle 40,
Forli 47121, Italy
e-mail: vittorio.ravaglioli2@unibo.it
Matteo De Cesare
Magneti Marelli Powertrain S.p.a.,
Via del Timavo 33,
Bologna 40131, Italy
e-mail: matteo.decesare@magnetimarelli.com
Via del Timavo 33,
Bologna 40131, Italy
e-mail: matteo.decesare@magnetimarelli.com
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 25, 2018; final manuscript received February 25, 2018; published online May 29, 2018. Editor: David Wisler.
1Corresponding author.
J. Eng. Gas Turbines Power. Sep 2018, 140(9): 092806 (6 pages)
Published Online: May 29, 2018
Article history
Revised:
February 25, 2018
Received:
February 25, 2018
Citation
Ponti, F., Ravaglioli, V., and De Cesare, M. (May 29, 2018). "Real-Time Processing of Engine Acoustic Emission for Diesel Injectors Diagnostic and Recentering." ASME. J. Eng. Gas Turbines Power. September 2018; 140(9): 092806. https://doi.org/10.1115/1.4039751
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