IFM, Institute for Vehicle Technology and Mobility1 Mobilität

Transmitted by the expert from Germany

The French/German ASEP proposal

05.09.2006

Informal document No. GRB-44-4(44th GRB, 4-6 September 2006agenda item 1.2.1.3.)

IFM, Institute for Vehicle Technology and Mobility2 Mobilität

• L_tyre = L_tyre_ref + a * log(v/v0)

L_tyre_ref = L_tyre(v0)

v0 = 50 km/h

• L_prop = L_prop_ref + b * (n – n0)

L_prop_ref = L_prop(n0)

n0 is determined by engine speed in gear i of Annex 3 at 50 km/h

L_prop_ref is determined by L_wot of annex 3 in gear i

b = 6/1000, if n > n0

b = 3/1000, if n < n0

• Lprop_ref is calculated using the following equation:

Lprop_ref = 10*log(10^(0.1*L_wot_i) – 10^(0.1*Lroll_50))

• L_ASEP_F (v, n) = 10 * log(10 (0.1 * (L_prop_ref + b * (n – n0)) + 10^(0.1 * L_tyre_ref + a * log(v/v0)))

+ 2 dB(A)

It is an open question whether n and v should be related to the microphone plane PP’, to Lmax or to the end of the test track BB’.

The Noise model

IFM, Institute for Vehicle Technology and Mobility3 Mobilität

Test track

IFM, Institute for Vehicle Technology and Mobility4 Mobilität

Results for vehicles with manual transmission

45

50

55

60

65

70

75

80

85

-30 -20 -10 0 10 20 30 40

distance in m

v in

km

/h,

L in

dB

(A)

1000

1500

2000

2500

3000

3500

4000

4500

5000

eng

ine

spee

d i

n m

in-1

vL_rn

vehicle 118

A

A'

P

P'

B

B'

Lmax

IFM, Institute for Vehicle Technology and Mobility5 Mobilität

Propulsion noise limit curve

65

70

75

80

85

0 1000 2000 3000 4000 5000 6000

engine speed in min-1

Lmax

in d

B(A

)

noise emission threshold

reference point, 2988 min-1, 74 dB(A), no extra tolerance

power to mass ratio index = 220, idling speed = 1000 min-1, rated speed = 8000 min-1

IFM, Institute for Vehicle Technology and Mobility6 Mobilität

Example

60

65

70

75

80

20 30 40 50 60 70 80

v(Lmax) in km/h

Lmax

in d

B(A

)

gear 2, right, n > n_limit_asepgear 2, left, n > n_limit_asep

gear 2, rightgear 2, left

gear 3, rightgear 3, left

L_asep_F, gear 2L_asep_F, gear 3

Lmax_i

veh 5, 5-speed manual, power to mass ratio index 59.19

IFM, Institute for Vehicle Technology and Mobility7 Mobilität

• Vehicle speeds between 20 km/h (v_AA’) and 70 km/h (v_BB’)

• Engine speeds at BB’ up to 2,6*pmr-0,29* (s – n_idle) + n_idle, but not more than 0,9* (s – n_idle) + n_idle

• with s – rated engine speed in min-1,

• n_idle – idling speed in min-1

• pmr = Pn in kW/(m0 in kg +75)*1000

• pmr is the power to mass ratio index. This is the rated power of the vehicle (Pn) in kW di-vided by the kerb mass of the vehicle (m0) in kg + 75 (to account for the mass of the driver) and multiplied by 1000.

Test area limitations

IFM, Institute for Vehicle Technology and Mobility8 Mobilität

Engine speed limitation

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0 20 40 60 80 100 120 140 160

power to mass ratio in kW/t

(n -

n_i

dle

)/(s

- n

_id

le)

n_norm_95_ave_in_usen_norm_95_high_in_use

n_norm_in_norm_max_BB'

vehicles with manual transmission

compactcars likeSmart

GTI class like

VW Golf

IFM, Institute for Vehicle Technology and Mobility9 Mobilität

GRB 0906

Thank you for your patience