gmu gm project l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
GMU – GM PROJECT PowerPoint Presentation
Download Presentation
GMU – GM PROJECT

Loading in 2 Seconds...

play fullscreen
1 / 33

GMU – GM PROJECT - PowerPoint PPT Presentation


  • 229 Views
  • Uploaded on

GMU – GM PROJECT. Model-Based On-Board Fault Diagnosis of Emission Control Components in Automotive Engines “FaultFinder” 1990-1996. The emission control problem. Main pollutants in automotive tailpipe emissions: Hydrocarbons (un-burnt fuel) Carbon monoxide (partially burnt fuel)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'GMU – GM PROJECT' - Audrey


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
gmu gm project
GMU – GM PROJECT

Model-Based On-Board Fault Diagnosis of

Emission Control Components in

Automotive Engines

“FaultFinder”

1990-1996

the emission control problem
The emission control problem

Main pollutants in automotive tailpipe emissions:

  • Hydrocarbons (un-burnt fuel)
  • Carbon monoxide (partially burnt fuel)
  • Nitrous oxides (compounds arising from high-pressure combustion)

Single catalytic converter for the three pollutants

basic fuel control system
Basic fuel-control system

driver

air

exhaust

THROTTLE

ENGINE

fuel

FUEL

INJECTOR

POSITION

SENSOR

OXYGEN

SENSOR

CONTROLLER

feed-forward

feedback

slide5

Exhaust gas recirculation (EGR)

driver

air

exhaust

THROTTLE

ENGINE

EGR

VALVE

MAP

SENSOR

RPM

SENSOR

CONTROLLER

on board diagnosis obd ii regulation mid nineties
On-Board Diagnosis (OBD) – II Regulation(Mid-nineties)

Any fault of an emission control component

causing any of the three main pollutants

to exceed its legal limit by 50%

must be detected/diagnosed within three driving cycles.

Warning light must illuminate.

Driving cycle: 25 min highway/city

slide7

Car engine model

Thr Egr Fuel Load

MANIFOLD

SUBSYSTEM

INERTIAL

SUBSYTEM

AIR-FUEL

SUBSYSTEM

Map Oxygen Rpm

Thr: throttle Egr: exhaust gas recirculation

Map: Manifold absolute pressure Rpm: Revolutions per minute

car engine model
Car engine model

Car engine model

Thr Egr Fuel Load

MANIFOLD

SUBSYSTEM

INERTIAL

SUBSYTEM

AIR-FUEL

SUBSYSTEM

Map Oxygen Rpm

car engine model9
Car engine model

Car engine model

Car engine model

Thr Egr Fuel

MANIFOLD

SUBSYSTEM

AIR-FUEL

SUBSYSTEM

Rpm

Map Oxygen

work plan
Work-plan
  • Data-collection from vehicle

(idle, city, highway, hill)

  • Model identification

(direct identification of each equation)

  • Algorithm design
  • Coding (HC11; assembly code, memory-limited system)
  • Building fault-emulators (hardware on vehicle)
  • Road testing (fault free/faulty)
six variable system
Six-variable system

Thr

Thr Egr Fuel Map Rpm VO2

0 1 1 1 1 1

1 0 1 1 1 1

1 1 0 1 1 1

1 1 1 0 1 1

1 1 1 1 0 1

1 1 1 1 1 0

VO2: Oxygen sensor voltage

Map

Egr

Fuel

VO2

Rpm

slide16

Four-variable system

Thr

Map

Thr/Iac Egr Map Maf

0 1 1 1

1 0 1 1

1 1 0 1

1 1 1 0

Iac: Idle air control

Maf: Mass air flow

MANIFOLD

SUBSYSTEM

Iac

Egr

Maf

the four subsystems
The four subsystems

Thr/Iac

Egr

THROTTLE

BODY

INTAKE

MANIFOLD

Map

Maf

Map

Maf

residual generation
Residual generation

Thr Iac Egr

Map

MODEL

-

+

Map^

EXCEPTIONS

Thr Rpm

raw residual

a typical equation
A “typical” equation

Map^(t) = 13.72 constant

+ 0.78*Thr(t)

+ 0.049*Iac(t)

+ 0.22*Egr(t)

+ 0.66*Map(t-1) autoregressive term

– 0.0085*Thr2(t)

– 0.001*Iac(t)*Egr(t)

linear terms

nonlinear terms

residual processing
Residual processing

raw residual

LOW-PASS FILTER

filtered residual

THRESHOLD TESTING

0/+1/-1

UP/DOWN COUNTER

count (periodically reset)

THRESHOLD TESTING

one bit of the fault-code

25 car fleet experiment
25-car fleet experiment

Fleet of “identical” vehicles (Chevy Blazer) available at GM

  • Collect data from 25 vehicles
  • Identify models from combined data from 5 vehicles
  • Test on data from 25 vehicles

Residual means and variances vary

 increase thresholds (sacrifice sensitivity)

Only a 50% increase is necessary

fault sensitivities
Fault sensitivities

Critical fault sizes for detection and diagnosis

(fleet experiment)

Thr Iac Egr Map Maf

detection 2% 10% 12% 5% 2%

diagnosis 6% 20% 17% 7% 8%

contributors
Contributors

At GMU At GM

Ron Hira Man-Feng Chang

Xiaowen Fang Mark Costin

Qiang Luo Derong Liu

Moid Kunwer Tom Ting

Ramin Monajemy John Van Gilder

Zdzislaw Kowalczuk

Jim Heron

Bill Hunter

Yong Li

Jason Peng

epilogue
Epilogue
  • May 26, 2004

DETROIT, Michigan - General Motors honors its top

innovators of 2003 at the 28th annual "Boss" Kettering

Awards ceremony today.

The "Boss" Kettering Award is GM’s highest award for

recognizing GM technical inventions and innovations.

faultfinder model based approach for advanced engine diagnostics
FaultFinder: Model-Based Approach for Advanced Engine Diagnostics

This model-based approach for advanced engine

diagnostics … requires no additional sensors or other

hardware, reduces false-alarm rates, improves vehicle

repair rates and dealership effectiveness.

slide32
This innovation has beenimplemented in the2004

Chevrolet Malibufeaturing ECOTEC 2.2-LITER 4-

cylinder engines;Cadillacsfeaturing the Northstar

4.6-liter V-8 engines; andChevrolet Colorado and

GMC Canyon mid-size trucks.

The FaultFinder team includes Thomas Ting and Dr. Man-Feng Chang of GM

R&D; John Van Gilder and Dr. Mark Costin of GM Powertrain Division.

janos
Janos,

While celebrating this recognition, we would like to

acknowledge your invaluable contributions as a Principal

Investigator of a five-year joint project between GM and

George Mason University.   The project resulted in the

first General Motors experimental demonstration of

model-based diagnostics for the detection of faults in an

engine emission system.  This is an important step and

set the stage for further research in this area.

Thank you again.  Man-Feng