Road Drive Patterns of EV

KOTSA(Korea Transportation Safety Authority) KATRI (Korea Automobile Testing & Research Institute)

Jinwoo Park, Chief Researcher

(truehelp@ts2020.kr)

2

Road operation monitoring of EV

3

◎ What is the adequate sound levels of the AVAS?

Study content

2. Compare to ICEV

3. Sound type and volume

3. Others

GRB Proposal for guidelines

(c) The sound volume of the AVAS should not exceed the volumes generated by passenger cars, trucks and other vehicles powered exclusively by an internal combustion engine and running at a speed of 20 km/h in their practical uses.

1. Human detection

4

◎ Sound level of ICEV in practical uses

High Acceleration

High SPL

Low SPL

Cruise

It is important to determine which driving status we use. But, the test have be done only in cruise mode with ICEV. Will the SPL in cruise be sufficient?

Applicability of findings

dB

Low Acceleration

5

Last study(2nd meeting)

◎ Graph according to acceleration

m/s2

45,0

50,0

55,0

60,0

65,0

70,0

75,0

10 15 20 25 30

dB(A)

Km/h

Constant

0.18

0.2

0.22

0.3

0.4

0.65

0.7

1.2

“Not only cruise should be considered but also acceleration”.

Why should acceleration be considered?

6

◎ Research contents

Research on the EV

Period : 2010~2012 Expense : 2.7 millon dollars

Contents List

Road operation monitoring Operating conditions, Road, Weak point, conditions and so on

Safety assessment

Electricity safety during charging

Safety of high voltage electricity system

Safety of Storage battery

Rate of fuel consumption

Safety of online EV

System power

QRTV

Assessment of running ability

Running distance at one charging

General characteristic of EV

Grade ability, Headlamp and so on

7

◎ City and driving days

Research of road operation monitoring on the EV

Vehicle city Driving days

Blueon

Seoul 259

Ansan 304

Sangju 134

Whaseong 20

Jeju 226

Ray Suwon 165

Whaseong 19

SM3 Daegu 67

Total : 1,194 days

Drive patterns(sample)

0

20

40

60

80

1 40 79 118

157

196

235

274

313

352

391

430

469

508

547

586

625

664

703

742

781

820

859

898

937

976

1015

1054

1093

1132

1171

1210

1249

1288

1327

1366

1405

1444

1483

1522

1561

1600

1639

1678

1717

1756

1795

1834

1873

1912

Drive patterns in Seoul city

0

5

10

15

20

1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85

0

10

20

30

40

1 12 23 34 45 56 67 78 89 100

111

122

133

144

155

166

177

188

199

210

221

232

243

Km/h

Km/h Km/h s

s s

0.83m/s2

0.49m/s2

0.89m/s2

9

0

10

20

30

40

50

60

70

80

90

1 99 197

295

393

491

589

687

785

883

981

1079

1177

1275

1373

1471

1569

1667

1765

1863

1961

2059

2157

2255

2353

2451

2549

2647

2745

2843

2941

3039

3137

3235

3333

3431

3529

3627

3725

3823

3921

4019

4117

4215

4313

4411

4509

4607

Drive patterns in Seoul city

0

10

20

30

40

50

1 7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97 103

109

115

121

127

133

139

145

151

157

163

169

175

181

187

193

199

205

211

217

223

229

235

10

0

5

10

15

20

25

30

35

40

45

1 7 13 19 25 31 37 43 49 55 61 67 73 79 85 91 97 103

109

115

0

20

40

60

80

100

1 20 39 58 77 96 115

134

153

172

191

210

229

248

267

286

305

324

343

362

381

400

419

438

457

476

495

514

533

552

571

590

609

628

647

666

685

704

723

742

761

780

799

818

837

856

875

Drive patterns in Daegu city

0

10

20

30

40

50

60

1 6 11 16 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96 101

1.39m/s2

1.6m/s2

11

0

20

40

60

80

100

1 48 95 142

189

236

283

330

377

424

471

518

565

612

659

706

753

800

847

894

941

988

1035

1082

1129

1176

1223

1270

1317

1364

1411

1458

1505

1552

1599

1646

1693

1740

1787

1834

1881

1928

1975

2022

2069

2116

2163

2210

2257

0

20

40

60

80

100

1 32 63 94 125

156

187

218

249

280

311

342

373

404

435

466

497

528

559

590

621

652

683

714

745

776

807

838

869

900

931

962

993

1024

1055

1086

1117

1148

1179

1210

1241

1272

1303

1334

1365

1396

1427

Drive patterns in Whaseong city

12

Analysis

◎ Patterns

1. Instantaneous acceleration or deceleration occur continuously

in actual road driving.

2. It is hard to see cruise drive patterns especially in low speed.

3. Also, it is not easy to maintain constant speed in low speed.

13

Conclusion

1. Many transient drive patterns are typical for real traffic situation.

2. Actually, it is hard to maintain constant speed within a low

velocity.

3. We have to determine the reference driving condition either minimum level compared to ICEV or the real traffic sound level of ICEV.

4. The generated sound during cruise is close to minimum.

5. Therefore, the SPL should increase if we consider acceleration.

Thank you for your attention!