ANNEX X

‘ANNEX XXII Devices for monitoring on board the vehicle the consumption of fuel and/or electric energy

1. Introduction

This Annex sets out the definitions and requirements applicable to the devices for monitoring on board the vehicle the consumption of fuel and/or electric energy.

2. Definitions

2.1

‘On-board Fuel and/or Energy Consumption Monitoring Device’ (‘OBFCM device’) means any element of design, either software and/or hardware, which senses and uses vehicle, engine, fuel and/or electric energy parameters to determine and make available at least the information laid down in point 3, and store the lifetime values on board the vehicle.

2.2

‘Lifetime’ value of a certain quantity determined and stored at a time t shall be the values of this quantity accumulated since the completion of production of the vehicle until time t.

2.3.

‘Engine fuel rate’ means the amount of fuel injected into the engine per unit of time. It does not include fuel injected directly into the pollution control device.

2.4

‘Vehicle fuel rate’ means the amount of fuel injected into the engine and directly into the pollution control device per unit of time. It does not include the fuel used by a fuel operated heater.

2.5

‘Total Fuel Consumed (lifetime)’ means the accumulation of the calculated amount of fuel injected into the engine and the calculated amount of fuel injected directly into the pollution control device. It does not include the fuel used by a fuel operated heater.

2.6

‘Total Distance Travelled (lifetime)’ means the accumulation of the distance travelled using the same data source that the vehicle odometer uses.

2.7

‘Grid energy’ means, for OVC-HEVs, the electric energy flowing into the battery when the vehicle is connected to an external power supply and the engine is turned off. It shall not include electrical losses between the external power source and the battery.

2.8

‘Charge sustaining operation’ means, for OVC-HEVs, the state of vehicle operation when the REESS state of charge (SOC) may fluctuate but the intent of the vehicle control system is to maintain, on average, the current state of charge.

2.9

‘Charge depleting operation’ means, for OVC-HEVs, the state of vehicle operation when the current REESS SOC is higher than the charge sustaining target SOC value and, while it may fluctuate, the intent of the vehicle control system is to deplete the SOC from a higher level down to the charge sustaining target SOC value.

2.10

‘Driver-selectable charge increasing operation’ means, for OVC-HEVs, the operating condition in which the driver has selected a mode of operation, with the intention to increase the REESS SOC.

3. Information to be determined, stored and made available

The OBFCM device shall determine at least the following parameters and store the lifetime values on board the vehicle. The parameters shall be calculated and scaled according the standards referred to in points 6.5.3.2 (a) of Paragraph 6.5.3. of Appendix 1 to Annex 11 to UN/ECE Regulation No 83, understood as set out in Point 2.8. of Appendix 1 to Annex XI to this Regulation.

3.1. For all vehicles referred to in Article 4a, with the exception of OVC-HEVs:
(a)

Total fuel consumed (lifetime) (litres);

(b)

total distance travelled (lifetime) (kilometres);

(c)

engine fuel rate (grams/second);

(d)

engine fuel rate (litres/hour);

(e)

vehicle fuel rate (grams/second);

(f)

vehicle speed (kilometres/hour).

3.2. For OVC-HEVs:
(a)

Total fuel consumed (lifetime) (litres);

(b)

total fuel consumed in charge depleting operation (lifetime) (litres);

(c)

total fuel consumed in driver-selectable charge increasing operation (lifetime) (litres);

(d)

total distance travelled (lifetime) (kilometres);

(e)

total distance travelled in charge depleting operation with engine off (lifetime) (kilometres);

(f)

total distance travelled in charge depleting operation with engine running (lifetime) (kilometres);

(g)

total distance travelled in driver-selectable charge increasing operation (lifetime) (kilometres);

(h)

engine fuel rate (grams/second);

(i)

engine fuel rate (litres/hour);

(j)

vehicle fuel rate (grams/second);

(k)

vehicle speed (kilometres/hour);

(l)

total grid energy into the battery (lifetime) (kWh).

4. Accuracy

4.1With regard to the information specified in point 3, the manufacturer shall ensure that the OBFCM device provides the most accurate values that can be achieved by the measurement and calculation system of the engine control unit.

4.2Notwithstanding point 4.1, the manufacturer shall ensure that the accuracy is higher than – 0,05 and lower than 0,05 calculated with three decimals using the following formula:

Where:

Fuel_ConsumedWLTP (litres)

is the fuel consumption determined at the first test carried out in accordance with point 1.2 of Sub-Annex 6 of Annex XXI, calculated in accordance with paragraph 6 of Sub-Annex 7 of that Annex, using emission results over the total cycle before applying corrections (output of step 2 in table A7/1 of Sub-Annex 7), multiplied by the actual distance driven and divided by 100.

Fuel_ConsumedOBFCM (litres)

is the fuel consumption determined for the same test using the differentials of the parameter “Total fuel consumed (lifetime)” as provided by the OBFCM device.

For OVC-HEVs the charge-sustaining Type 1 test shall be used.

4.2.1If the accuracy requirements set out in point 4.2 are not met, the accuracy shall be recalculated for subsequent Type 1 tests performed in accordance with point 1.2 of Sub-Annex 6, in accordance with the formulae in point 4.2, using the fuel consumed determined and accumulated over all performed tests. The accuracy requirement shall be deemed to be fulfilled once the accuracy is higher than – 0,05 and lower than 0,05.

4.2.2If the accuracy requirements set out in point 4.2.1 are not met following the subsequent tests pursuant to this point, additional tests may be performed for the purpose of determining the accuracy, however, the total number of tests shall not exceed three tests for a vehicle tested without using the interpolation method (vehicle H), and six tests for a vehicle tested using the interpolation method (three tests for vehicle H and three tests for vehicle L). The accuracy shall be recalculated for the additional subsequent Type 1 tests in accordance with the formulae in point 4.2, using the fuel consumed determined and accumulated over all performed tests. The requirement shall be deemed to be fulfilled once the accuracy is higher than – 0,05 and lower than 0,05. Where the tests have been performed only for the purpose of determining the accuracy of the OBFCM device, the results of the additional tests shall not be taken into account for any other purposes.

5. Access to the information provided by the OBFCM device

5.1The OBFCM device shall provide for standardised and unrestricted access of the information specified in point 3, and shall conform to the standards referred to in points 6.5.3.1 (a) and 6.5.3.2 (a) of Paragraph 6.5.3. of Appendix 1 to Annex 11 to UN/ECE Regulation No 83, understood as set out in Point 2.8. of Appendix 1 to Annex XI to this Regulation.

5.2.By way of exemption from the reset conditions specified in the standards referred to in point 5.1 and notwithstanding points 5.3. and 5.4., once the vehicle has entered into service the values of the lifetime counters shall be preserved.

5.3The values of the lifetime counters may be reset only for those vehicles for which the memory type of the engine control unit is unable to preserve data when not powered by electricity. For those vehicles the values may be reset simultaneously only in the case the battery is disconnected from the vehicle. The obligation to preserve the values of the lifetime counters shall in this case apply for new type approvals at the latest from 1 January 2022 and for new vehicles from 1 January 2023.

5.4.In the case of malfunctioning affecting the values of the lifetime counters, or replacement of the engine control unit, the counters may be reset simultaneously to ensure that the values remain fully synchronised.’’;