Research Papers: Internal Combustion Engines

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

[+] Author and Article Information
Fabrizio Ponti

Department of Industrial Engineering (DIN),
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

Matteo De Cesare

Magneti Marelli Powertrain S.p.a.,
Via del Timavo 33,
Bologna 40131, Italy
e-mail: matteo.decesare@magnetimarelli.com

1Corresponding author.

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.

J. Eng. Gas Turbines Power 140(9), 092806 (May 29, 2018) (6 pages) Paper No: GTP-18-1092; doi: 10.1115/1.4039751 History: Received February 25, 2018; Revised February 25, 2018

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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Fig. 1

Scheme of the injection pattern

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Fig. 2

Experimental setup

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Fig. 3

Scheme of the real-time combustion controller implemented in the RCP system

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Fig. 4

Application of the real-time combustion control strategy to a test run at 2000 rpm and imep = 3.5 bar: forced Qpre variation (top plot) and real-time calculated SOI and ET for main injection (bottom plot)

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Fig. 5

Application of the real-time combustion control strategy to a test run at 2000 rpm and imep = 3.5 bar: Qmain, indicated torque and center of combustion

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Fig. 6

Frequency response function of the A-weighting filter

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Fig. 7

Correlation between Qpre and noise index, calculated using both microphones, for the test run at 2000 rpm and imep = 3.5 bar

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Fig. 8

Soot and NOx variations as functions of Qpre during the test run at 2000 rpm and imep = 3.5 bar



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