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Road Drive Patterns of EV
KOTSA(Korea Transportation Safety Authority) KATRI (Korea Automobile Testing & Research Institute)
Jinwoo Park, Chief Researcher
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!