Document ID: chunk:federal_register_of_legislation:F2022C00213:reg:120:p12
Version: federal_register_of_legislation:F2022C00213
Segment Type: reg
Provision Reference: reg 120 (pt 12/56)
Character Range: 187374–190415

storage systems than an electric battery, Ebatt is representing Estorage, the energy balance of the electric energy storage device.

       5.3.1.1. The electricity balance Q [Ah], measured using the procedure specified in appendix 2 to this annex, is used as a measure of the difference in the vehicle battery's energy content at the end of the cycle compared to the beginning of the cycle.  The electricity balance is to be determined separately for the Part One cycle and the Part Two cycle.

       5.3.2. Under the conditions below, it is allowed to take the uncorrected measured values C and M as the test results:

            1) in case the manufacturer can prove that there is no relation between the energy balance and fuel consumption,

            2) in case that Ebatt always corresponds to a battery charging,

            3) in case that Ebatt always corresponds to a battery decharging and Ebatt is within 1 per cent of the energy content of the consumed fuel (consumed fuel meaning the total fuel consumption over 1 cycle).

        The change in battery energy content Ebatt can be calculated from the measured electricity balance Q as follows:

       Ebatt  =  SOC(%) ·ETEbatt    0.0036·|Ah|·Vbatt  =  0.0036·Q·Vbatt   (MJ)

        with ETEbatt [MJ] the total energy storage capacity of the battery and Vbatt [V] the nominal battery voltage.

       5.3.3. Fuel consumption correction coefficient (Kfuel) defined by the manufacturer

       5.3.3.1. The fuel consumption correction coefficient (Kfuel) shall be determined from a set of n measurements performed by the manufacturer. This set should contain at least one measurement with Qi < 0 and at least one with Qj > 0.

        If the latter condition can not be realised on the driving cycle (Part One or Part Two) used in this test, then it is up to the Technical Service to judge the statistical significance of the extrapolation necessary to determine the fuel consumption value at Ebatt = 0.

       5.3.3.2. The fuel consumption correction coefficient (Kfuel) is defined as:

       Kfuel = (n·QiCi - Qi·Ci) / (n·Qi2 – (Qi)2)           (l/100 km/Ah)

        where:

        Ci : fuel consumption measured during i-th manufacturer's test (l/100 km)

        Qi : electricity balance measured during i-th manufacturer's test (Ah)

        n : number of data

        The fuel consumption correction coefficient shall be rounded to four significant figures (e.g. 0.xxxx or xx.xx).  The statistical significance of the fuel consumption correction coefficient is to be judged by the Technical Service.

       5.3.3.3. Separate fuel consumption correction coefficients shall be determined for the fuel consumption values measured over the Part One cycle and the Part Two cycle respectively.

       5.3.4. Fuel consumption at zero battery energy balance (C0)

       5.3.4.1. The fuel consumption C0 at Ebatt = 0 is determined by the following equation:

       C0 = C – Kfuel·Q           (l/100 km)

        where: