Noise Emission of Motor Vehicles

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Presentation transcript:

Noise Emission of Motor Vehicles Automotive Prepared for the GRB-meeting on 21.02.2001 TÜV Süddeutschland Group 1

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

Noise Emission in different Gears Automotive TÜV Süddeutschland Group 3

Noise Emission in different Gears Automotive TÜV Süddeutschland Group 4

Noise Emission in different Gears Automotive TÜV Süddeutschland Group 5

Noise Emission in different Gears Automotive TÜV Süddeutschland Group 6

Noise Emission in different Gears Automotive TÜV Süddeutschland Group 7

Tyre/Road Noise Influence Automotive Average tyre noise influence on overall result: ECE R 51: 35%, Gov-D prop: 45%, OICA prop: 64%, Gov-NL prop: 61% TÜV Süddeutschland Group 8

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

Noise Emission in Real Traffic Automotive TÜV Süddeutschland Group 10

Noise Emission in Real Traffic Automotive TÜV Süddeutschland Group 11

Lmax versus Leq Automotive TÜV Süddeutschland Group 12

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

Vehicle Speed Distributions Automotive TÜV Süddeutschland Group 14

Target Accelerations Automotive TÜV Süddeutschland Group 15

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

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

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