ANNEX ISPECIAL REQUIREMENTS FOR VEHICLES EQUIPPED WITH GEAR SHIFT INDICATORS (GSI)
4.The fuel economy impact of GSI recommended gear shift points shall be determined according to the following procedure:
4.1.Determination of vehicle speeds at which GSI recommends shifting up gears
This test is to be performed on a warmed up vehicle on a chassis dynamometer according to the speed profile described in Appendix 1 to this Annex. The advice of the GSI is followed for shifting up gears and the vehicle speeds, for which the GSI recommends shifting, are recorded. The test is repeated 3 times.
VnGSI shall denote the average speed at which the GSI recommends shifting up from gear n (n = 1, 2, …, #g) into gear n + 1, determined from the 3 tests, where #g shall denote the vehicle’s number of forward gears. For this purpose only GSI shift instructions in the phase before the maximum speed is reached are taken into account and any GSI instruction during the deceleration is ignored.
For the purposes of the following calculations V0GSI is set to 0 km/h and V#gGSI is set to 140 km/h or the maximum vehicle speed, whichever is smaller. Where the vehicle cannot attain 140 km/h, the vehicle shall be driven at its maximum speed until it rejoins the speed profile in Figure I.1.
Alternatively, the recommended GSI shift speeds may be analytically determined by the manufacturer based on the GSI algorithm contained in the extended documentation package provided according to point 3.1.
4.2.Standard gear shift points
Vnstd shall denote the speed at which a typical driver is assumed to shift up from gear n into gear n + 1 without GSI recommendation. Based on the gear shift points defined in the type 1 emission test4 the following standard gear shift speeds are defined:
- V0std
0 km/h;
- V1std
15 km/h;
- V2std
35 km/h;
- V3std
50 km/h;
- V4std
70 km/h;
- V5std
90 km/h;
- V6std
110 km/h;
- V7std
130 km/h;
- V8std
V#gGSI;
Vnmin shall denote the minimum vehicle speed the vehicle can be driven in the gear n without stalling of the engine and Vnmax the maximum vehicle speed the vehicle can be driven in the gear n without creating damage to the engine.
If Vnstd derived from this list is smaller than Vn + 1min, then Vnstd is set to be Vn + 1min. If Vnstd derived from this list is greater than Vnmax, then Vnstd is set to be Vnmax (n = 1, 2, …, #g – 1).
If V#gstd determined by this procedure is smaller than V#gGSI, it shall be set to V#gGSI.
4.3.Fuel consumption speed curves
The manufacturer shall supply the type-approval authority with the functional dependence of the vehicle’s fuel consumption on the steady vehicle speed when driving with gear n according to the following rules.
FCni shall denote the fuel consumption in terms of kg/h (kilograms per hour) when the vehicle is driven with the constant vehicle speed vi = i × 5 km/h – 2,5 km/h (where i is a positive integer number) in the gear n. These data shall be provided by the manufacturer for each gear n (n = 1, 2, …, #g) and vnmin ≤ vi ≤ vnmax. These fuel consumption values shall be determined under identical ambient conditions corresponding to a realistic driving situation that may be defined by the vehicle manufacturer, either by a physical test or by an appropriate calculation model agreed between the approval authority and the manufacturer.
4.4.Vehicle speed distribution
The following distribution should be used for the probability Pi that the vehicle drives with a speed v, where vi – 2,5 km/h < v ≤ vi + 2,5 km/h (i = 1, …, 28):
i | Pi |
---|---|
1 | 4,610535879 |
2 | 5,083909299 |
3 | 4,86818148 |
4 | 5,128313511 |
5 | 5,233189418 |
6 | 5,548597362 |
7 | 5,768706442 |
8 | 5,881761847 |
9 | 6,105763476 |
10 | 6,098904359 |
11 | 5,533164348 |
12 | 4,761325003 |
13 | 4,077325232 |
14 | 3,533825909 |
15 | 2,968643201 |
16 | 2,61326375 |
17 | 2,275220718 |
18 | 2,014651418 |
19 | 1,873070659 |
20 | 1,838715054 |
21 | 1,982122053 |
22 | 2,124757402 |
23 | 2,226658166 |
24 | 2,137249569 |
25 | 1,76902642 |
26 | 1,665033625 |
27 | 1,671035353 |
28 | 0,607049046 |
Where the maximum speed of the vehicle corresponds to step i and i < 28, the values of Pi + 1 to P28 shall be added to Pi.
4.5.Determination of the model fuel consumption
FCGSI shall denote the fuel consumption of the vehicle when the driver follows the advice of the GSI:
FCGSIi = FCni, where Vn – 1GSI ≤ vi < VnGSI (for n = 1, …, #g) and FCGSIi = 0 if vi ≥ V#gGSI
FCstd shall denote the fuel consumption of the vehicle when standard gear shift points are used:
FCstdi = FCni, where Vn – 1std ≤ vi < Vnstd (for n = 1, …, #g) and FCstdi = 0 if vi ≥ V#gGSI
The relative saving of fuel consumption by following the advice of the GSI of the model is calculated as:
FCrel. Save = (1 – FCGSI/FCstd) × 100 %
4.6.Data records
The following information shall be recorded:
the values of VnGSI as determined according to point 4.1,
the values FCni of the fuel consumption speed curve as communicated by the manufacturer according to point 4.3,
the values FCGSI, FCstd and FCrel. Save as calculated according to point 4.5.