Hybrid electric vehicles (HEVs) can potentially reduce vehicle CO 2 emissions by further using recuperated kinetic vehicle energy stored as electric energy. This ability mainly depends on the type and layout of the electric storage device, its manufacturing deviation and in-use deterioration. The resulting performance affects net HEV CO 2 emissions in a certain driving pattern, described as equivalent to unchanged net energy content of that storage device. This energy content cannot be measured externally, demanding a correction procedure to determine net HEV CO 2 emissions from their raw CO 2 emissions. The present study investigates such effects on HEV CO 2 emissions based on chassis dynamometer test results with three identical in-use examples of a conventional HEV model featuring different mileages. Statutory and realworld driving cycles together with full electric vehicle operation modes have therefore been considered. It is shown that the individual drive battery performance of the single HEVs affects both their raw CO 2 emissions and the outcomes of the statutory correction procedure. The corrected CO 2 emissions of a HEV in any driving pattern resulting from this statutory procedure clearly underestimate their true level which can be only reproduced when account is taken on the individual HEV drive battery performance.
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