Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Volkswagen Emission Scandal, Lecture notes of Designs and Groups

Marcus Oldham College (MOC)Designs and Groups

Volkswagen Emissions. Scandal. DESIGN OF EXPERIMENTS (DOE) ... Overview of Volkswagen Company. • Problems Identified and COPQ. • Root Cause Analysis.

Typology: Lecture notes

2021/2022

Uploaded on 07/05/2022

barbara_gr
barbara_gr 🇦🇺

4.6

(73)

1K documents

1 / 26

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Volkswagen Emissions
Scandal
DESIGN O F E X P E R I M E N T S (DOE)
FINAL PRESENTATION
VOLKSWAGEN EMISSIONS SCANDAL - GROUP 3
Group 3:
Aditya Krishnan
Anurag Kumar Ashok Kumar
Nithin Katragadda
Saahith Kuraparthi
Sindhu Kundur
Xiaqing Li
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a

Partial preview of the text

Download Volkswagen Emission Scandal and more Lecture notes Designs and Groups in PDF only on Docsity!

Volkswagen Emissions

Scandal

DESIGN OF EXPERIMENTS (DOE)

FINAL PRESENTATION

VOLKSWAGEN EMISSIONS SCANDAL - GROUP 3

Group 3: Aditya Krishnan Anurag Kumar Ashok Kumar Nithin Katragadda Saahith Kuraparthi Sindhu Kundur Xiaqing Li

Agenda

  • Problem Statement
  • Overview of Volkswagen Company
  • Problems Identified and COPQ
  • Root Cause Analysis
  • Design of Experiment

o 8 Steps of DOE using T-table

o DOE using Minitab

  • Conclusion

Overview of Volkswagen Company

  • Headquartered in Wolfsburg, Germany
  • Until January 2016, the largest manufacturer of cars in the world
  • Makers of some of the most iconic cars such as VW Beetle and Minibus.
  • Owns brands such as o Audi o Bugatti o Porsche o Lamborghini o Ducati o Bentley

Scandal

  • VW diesel cars had “defeat device” software installed in them o Could detect when cars were being tested and accordingly improve emission results
  • EPA discovered emission discrepancies in Sept 2015 o 500K cars in the US o 11 Million cars worldwide
  • “Defeat Device” found in Porsche and Audi models as well
  • Stocks plummet

Cost of Poor Quality

  • Non Conformities o Emission standards not met by diesel engines o Nitrogen Oxide(NO) emissions 40 times higher than the permissible limit
  • Inefficient Processes o Lack of transparency and accountability o Lack of proper quality checks
  • Lost Opportunities o Heavy costs incurred due to car recalls o Stock prices crashed o Brand value jeopardized

Items of Concern from COPQ

  • Not met standards set by regulatory body
  • No quality assessments by 3rd party vendors
  • Lack of transparency in the organization
  • Company chose to build “Defeat Device”

rather than tackle the emission problem

  • Huge losses for company and stakeholders
  • Company needs a lot of time and budget to

manage the recalls and correcting the

emission problem

Root Cause of Technical Issues - Pareto Chart

Design of Experiment

  • Based on Pareto chart o 43% cause of emission from Engine o If Engine is corrected, emissions will reduce significantly
  • Further analyzing the Engine, the factors that affect emissions o Engine Type  4 cylinder engine vs 6 cylinder engine o Weight  Small car (1 Ton) vs Large car (3.5 Tonnes) o Average Speeds  City Traffic (30 MPH) vs Highway Traffic (60 MPH)
  • The cars will undergo on-road emission testing to avoid discrepancies from in-house testing

Steps for Analysis of Effects in a DOE

I. Calculate the effects

II. Calculate the Pareto chart

III. Calculate the Standard Deviation of the experiment, Se

IV. Calculate the standard deviation of the Effects, Seff

V. Determine the T-statistic

VI. Calculate the decision limits and determine the significant effects

VII. Graph significant effects

VIII. Model the significant effects

Step 1 - Calculate the effects

  • Effects of Individual factors o Engine Type: 0.

o Weight: 2.

o Avg Speed: 1.

  • Effects of two level interactions o Engine and Weight: -0. o Engine and Avg Speed: -0.

o Weight and Avg Speed: 0.

  • Effects of three level interaction o Engine, Weight and Avg Speed: 0.

Step 3 - Calculate the Standard Deviation - Se

  • Average variance of the Base 8 Runs

o 𝑆𝑏^2 = 0.^21 +^4.^23 +^3.^65 +^1.^31 + 8 0.^19 +^0.^15 +^0.^17 +^0.^14 = 1. 26

  • Degree of Freedom for design

o 𝑑𝑓𝑏 = # 𝑜𝑓 𝑟𝑢𝑛𝑠 ∗ #𝑜𝑓 𝑟𝑒𝑝𝑙𝑖𝑐𝑎𝑡𝑒𝑠 − 1

= 8 ∗ 2 − 1 = 8

  • Calculate 𝑆𝑒^2

o 𝑆𝑒^2 = 𝑆𝑏^2 = 1.

o 𝑆𝑒 = 1.25 = 1.

Step 4 - Calculate the Standard Deviation of the Effects

  • 𝑆𝑒𝑓𝑓 = 𝑆𝑒 ∗

4 𝑁

  • 1.12 ∗

4 8

  • 1.12 ∗ 0.707 = 0.

Step 6 - Calculate decision limits and significant effects

𝐷𝑒𝑐𝑖𝑠𝑖𝑜𝑛 𝐿𝑖𝑚𝑖𝑡 = ±𝑡 ∗ 𝑆𝑒𝑓𝑓 = ±1.859 ∗ 0.792 = ±1.

Step 7 - Graph significant effects