22-04-23

Challenge the future

DelftUniversity ofTechnology

Tyre parameter identification from road tests on a complete vehicleDario Lo Conte, PME-EM

2Tyre parameter identification from road tests on a complete

vehicle

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vehicle

Outline

• Centro Ricerche Fiat• Problem description• Introduction to optimization• TyreEstimator• Conclusions and recommendations

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vehicle

CRF

• Centro Ricerche Fiat• Part of Fiat Group• 850 FTE• Scope

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vehicle

Problem description

• Experimental test data differs from vehicle model data

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vehicle

Problem description

• Reasons• Different tyre testing conditions• Different measurement method

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vehicle

Problem description

• Vehicle model

• Tyre model

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vehicle

Problem description

Current approach• Validation suspension• Manual tuning of tyre parameters

• Drawbacks• Takes some days of work• Inconsistent

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Problem description

“To improve the characterization of tyres from road tests an application needs to be developed that automates the identification of tyre model parameters.”

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Optimization

• Making things better• Get the best out of a calculation• Generating more profit

Provides a systematic approach for problem solving

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Optimization

• Euclides

• Calculate derivative

• Objective function• Design variables• Constraints

( ) 20 (8 )f x x x

'( ) 2 8 04

f x xx

x

8-x

x

8-x

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Optimization

•Local/Global minima• Algorithms

13Tyre parameter identification from road tests on a complete

vehicle

TyreEstimator1

Vehicle and tyre theory

2 Models

3 Manoeuvre

5 TyreEstimator

4 Measurements

6 Parameters

7 Optimization

8Considerations

9 Results

10 Conclusions and recommendations

Part I

Part II

Part III

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vehicle

TyreEstimator

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vehicle

TyreEstimator

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vehicle

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Kleurenbibliotheek

R 0G 64B 64

R 161G 0B 88

R 173G 198B 16

R 102G 188B 170

R 0G 43B 96

R 0G 147B 171

R 123G 160B 201

R 119G 192B 215

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vehicle

Grafiekkop

1e Kwartaal2e Kwartaal3e Kwartaal4e Kwartaal

Grafiek subkop

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GrafiekkopGrafiek subkop

0102030405060708090

100

2007 2007 2008 2008

EastWestNorthSouth

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Grafiekkop

0

20

40

60

80

100

1st Qtr 2nd Qtr 3rd Qtr 4th Qtr

EastWestNorthSouth

Grafiek subkop

21Tyre parameter identification from road tests on a complete

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