Optimizing Diesel Engine Technology PACCAR & RBEI MBD ...€¦ · Diesel knock is the clanking, rattling sound emitted from a running diesel engine. Diesel Engines are becoming extremely

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ROBERT BOSCH ENGINEERING AND BUSINESS SOLUTION LIMITED (RBEI)

Optimizing Diesel Engine Technology using Data Analysis in MATLAB

ROBERT BOSCH ENGINEERING AND BUSINESS SOLUTION LIMITED (RBEI)

RBEI/ETC | 8/7/2016

© Robert Bosch Engineering and Business Solutions Private Limited 2016. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the

event of applications for industrial property rights.

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Noise – Data Sources

Industrial Machinery & Processes Diesel Engine

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Tones?

Model Based Design & Development

Domain Expertise

Test & Measurement

Code Generation

Simulink & TargetLink

Toolbox:

Tones are noises with a narrow sound

frequency composition

Annoying tones source: machinery

with rotating parts

such as motors, gearboxes, fans and

pumps often create tones

Psychoacoustic metrics such as

TONE TO NOISE RATIO

The human ear functions as a dynamic

band pass filter. Only one tone can be

distinguished within a critical band.

Psychoacoustic metrics such as

PROMINENCE RATIO

Tones can be identified subjectively by

listening.

Psychoacoustic metrics such as the

Tonality

Pure Tones are waveforms that occur

at a Single Frequency

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Knocking?


Diesel knock is the clanking, rattling sound

emitted from a running diesel engine.

Diesel Engines are becoming extremely

popular due to its good fuel economy

Knocking index : impulsive noise analysis

parameter for engine sound quality

The ability to maximize power and fuel

economy by optimizing spark timing for a

given air/fuel ratio is limited by engine knock

Tuning vehicle NVH Parameter is a key

aspect of the powertrain development process

Effect on the

perceived

quality of

vehicles

01 02Misinterpreted

by customers as

defects

05

Influence on

vehicle interior

Sound Quality

0403Adherence

to Legal

Requireme

nts

Customer

Preference of

Vehicles with

little Diesel

Knocking

Introduction Knocking Effects

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Knocking Index : Impulsive Noise


Impulse noise is a category of (acoustic)

noise which includes unwanted, almost

instantaneous (thus impulse-like) sharp

sounds.

Knocking Index is an impulsive noise

analysis parameter for engine sound

quality

Noise consisting of random occurrences

of energy spikes having random

amplitude and spectral content.

Impulsive Noise Definition

Crank Angle

Cylin

der

Pre

ssure

Impulsive Engine Noise Signature

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Noise Vibration Harshness : Psychoacoustics


Knocking

Index

Tone-To-

Noise Ratio

Prominence

Ratio

Software Demo

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Prominence Ratio


FFT analysis

[Configurable Parameters] SPL

Spectrum

Calc. Critical

Band

Calc. overall SPL

in Middle Critical

Band

Calc. overall SPL

in Lower Critical

Band

Calc. overall SPL

in Upper Critical

Band

Determine PR for

the given tone

SPL : Sound Pressure Level : PR : Prominence Ratio

FFT(data), Data Windowing 20log(FFT /0.00002)

Design & Analyze Hamming, Kaiser, Gaussian, Hanning & other windows done using Matlab Signal

Processing Toolbox

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Prominence Ratio Results


Determination of Level of Middle

critical band : ECMA 74 Standard

Determination of Prominence Ratio

: ECMA 74 Standard

Spectral Analysis & Signal Modeling is done using Matlab Signal Processing Toolbox

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Prominence Ratio Results


PR : Discrete Tone Identification

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Workflow Tone to Noise Ratio

Model Based Design & DevelopmentFFT analysis

[Configurable

Parameters]

Calculate

Discrete Tone Level

Determination of

Masking noise level

Determination of

Tone-to-noise ratio

Parallel Processing of Data of various measurement file done using Parallel

computing Toolbox

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Workflow Tone to Noise Ratio

Masking Noise Level

Tone to Noise Ratio : ECMA-74

Prominent Discrete for TNR method

Multiple Tones in Critical Band:

ECMA-74

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Tone to Noise Ratio Results


TNR : Single Tone TNR : Multiple Tones

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Knocking Index : Approach

Identification of Noise

types &

Characteristics

Data

Analytics

Knocking

Index

Noise Types:

1.Knocking

2.Rattling

3.Ticking(Injectors)

4.Tonal Noise

Noise Characteristics:

1.Impulsivness

Database Toolbox

RBEI/ETC | 8/7/2016



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Infrastructure

Matlab

Compiler

Database

Toolbox

DSP

Toolbox

Signal

Processing

Toolbox

Matlab

R2015b

RBEI/ETC | 8/7/2016



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Summary

Easy to identify & configure threshold parameters as per ECMA

standard.

Performance improvement in the validation of the

components

One platform to perform Data Preprocessing & post

processing

The characteristic features of Diesel sounds can be identified

and quantified

Separation of Engine Noise sources & Analysis of Impulsive

Noise

RBEI | 8/7/2016



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Thank You

RBEI/ETC | 8/7/2016



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Images & References

http://www.bosch.com/en/com/home/index.php

http://in.mathworks.com/products/matlab/

http://www.ecma-international.org/publications/standards/Ecma-074.htm

http://in.mathworks.com/products/matlab/

http://www.ecma-international.org/publications/standards/Ecma-074.htm

Documents

Optimizing Diesel Engine Technology PACCAR & RBEI MBD ...€¦ · Diesel knock is the clanking, rattling sound emitted from a running diesel engine. Diesel Engines are becoming extremely