Division 3: DETERMINING THE HOT START BENEFIT (HSB) - Commission Implementing Decision of 10 September 2013 on the approval of the Daimler engine compartment encapsulation system as an innovative technology for reducing CO2 emissions from new passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance) (2013/451/EU)

The HSB of the EI vehicle shall be determined experimentally. This value describes the difference of CO₂ emissions between a cold start and a hot start NEDC test in relation to the cold start result:

Formula 2: $HSB = 1 - \frac{{CO}_{2} (hot)}{{CO}_{2} (14 °C)}$

with:

HSB

Hot Start Benefit

CO₂ (hot)

CO₂ emissions of hot start NEDC test [g CO₂/km]

CO₂ (14 °C)

CO₂ emissions of cold start NEDC test [g CO₂/km]

The coolant temperature at the beginning of the cold start test and the ambient temperature in the test cell shall not be below 14 °C. The hot start NEDC test shall be conducted following the cold start NEDC test. It is possible to perform one or two preconditioning NEDC tests between the cold start and the hot start NEDC test. It shall be ensured and documented that the state of charge (SOC) variation (for example, using his Controller Area Network signal) of the starter battery after each test is within 5 %. The complete test procedure shall be repeated at least two times. Arithmetic means of the cold start and of the hot start CO₂ results and the respective variation coefficients of the means shall be calculated. The complete test procedure shall be repeated as long as the variation coefficients of both arithmetic means are below 1 % (see point 4).

Division 3 DETERMINING THE HOT START BENEFIT (HSB)