1. Noise Emission of Motor Vehicles
Automotive
Prepared for the GRB-meeting on
TÜV Süddeutschland Group 1

2. Noise Emission in different Gears
Automotive
Examples:
Small car (1,2 l, 40 kW, 73 dB(A)),
Medium sized car (1,8 l, 110 kW, 71 dB(A)),
High performance car (4 l, 210 kW, 70 dB(A)),
Diesel car (2,2 l, 92 kW, 71 dB(A)),
Old car (1,3 l, 64 kW, 80 dB(A), 1972),
Light duty vehicle (2,9 l, 75 kW, 75 dB(A))
TÜV Süddeutschland Group 2

3. Noise Emission in different Gears
Automotive
TÜV Süddeutschland Group 3

4. Noise Emission in different Gears
Automotive
TÜV Süddeutschland Group 4

5. Noise Emission in different Gears
Automotive
TÜV Süddeutschland Group 5

6. Noise Emission in different Gears
Automotive
TÜV Süddeutschland Group 6

7. Noise Emission in different Gears
Automotive
TÜV Süddeutschland Group 7

8. Tyre/Road Noise Influence
Automotive
Average tyre noise influence on overall result:
ECE R 51: %,
Gov-D prop: 45%,
OICA prop: 64%,
Gov-NL prop: 61%
TÜV Süddeutschland Group 8

9. Questions Which noise source shall be addressed ?
Automotive
Which noise source shall be addressed ?
Mainly Propulsion Noise ?
Propulsion and tyre/road noise ?
Is it meaningful to include a constant speed test if the result is dominated by tyre/road noise ?
Is it meaningful to include tyre/road noise if the manufacturer can choose the test tyre ?
Wouldn‘t it be better to reduce the tyre contribution as much as possible ?
TÜV Süddeutschland Group 9

10. Noise Emission in Real Traffic
Automotive
TÜV Süddeutschland Group 10

11. Noise Emission in Real Traffic
Automotive
TÜV Süddeutschland Group 11

12. Lmax versus Leq
Automotive
TÜV Süddeutschland Group 12

13. Conclusions/Remarks ECE R 51 values are poorly correlated with Leq
Automotive
ECE R 51 values are poorly correlated with Leq
Gearshift behaviour is engine speed related rather than vehicle speed related
Objective of amendment of ECE R 51 needs to be clarified
TÜV Süddeutschland Group 13

14. Vehicle Speed Distributions
Automotive
TÜV Süddeutschland Group 14

15. Target Accelerations
Automotive
TÜV Süddeutschland Group 15

16. ECE R 51 OICA, max. Engine Speed
Automotive
TÜV Süddeutschland Group 16

17. Questions What type of roads shall be addressed ?
Automotive
What type of roads shall be addressed ?
Residential streets ?
Urban main streets ?
What vehicle speed range shall be used ?
How shall the target acceleration be defined ?
What is the limit to avoid suboptimisation of tyres ?
TÜV Süddeutschland Group 17

18. Questions
Automotive
A partial load test would be representative but would this be suitable to test the quality of silencers ?
Is a fixed vehicle speed suitable for the acceleration test since the gearshift behaviour is engine speed related rather than vehicle speed related ?
What is the final target ?
A quiet vehicle ?
Are additional specifications necessary to avoid cycle bypassing ?
TÜV Süddeutschland Group 18