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ID:
099294
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| Publication |
2010.
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| Summary/Abstract |
Hybrid electric vehicles (HEVs) can potentially reduce vehicle CO2 emissions by using recuperated kinetic vehicle energy stored as electric energy in a hybrid system battery (HSB). HSB performance affects the individual net HEV CO2 emissions for a given driving pattern, which is considered to be equivalent to unchanged net energy content in the HSB. The present study investigates the influence of HSB performance on the statutory correction procedure used to determine HEV CO2 emissions in Europe based on chassis dynamometer measurements with three identical in-use examples of a full HEV model featuring different mileages. Statutory and real-world driving cycles and full electric vehicle operation modes have been considered. The main observation is that the selected HEVs can only use 67-80% of the charge provided to the HSB, which distorts the outcomes of the statutory correction procedure that does not consider such irreversibility. CO2 emissions corrected according to this procedure underestimate the true net CO2 emissions of one HEV by approximately 13% in real-world urban driving. The correct CO2 emissions are only reproduced when considering the HSB performance in this driving pattern. The statutory procedure for correcting HEV CO2 emissions should, therefore, be adapted.
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| 2 |
ID:
162927
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| Summary/Abstract |
This paper empirically examines the factors influencing consumers’ choices concerning the purchase of hybrid electric vehicles (HEVs). In addition, the paper investigates whether purchasing HEVs causes a rebound effect through which purchasers of HEVs increase their annual vehicle mileage. The results suggest that consumers who are more attentive to fuel economy may be inclined to choose HEVs. Moreover, the existence of the direct rebound effect is confirmed by the finding that the purchase of an HEV leads to an increase in annual mileage per household. Greater mileage increases future fuel cost savings from using an HEV relative to a conventional vehicle, and thus potentially leads to increased fuel cost savings that offset the extra cost of choosing an HEV. However, if the purchase of HEVs leads to a considerable increase in annual mileage, overall annual automotive CO2 emissions per household may be significantly increased by using HEVs.
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| 3 |
ID:
168681
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| Summary/Abstract |
While the fuel economy of Japanese automobiles has improved by 40% in the past decade, gasoline consumption in the transportation sector from 2007 to 2016 only decreased by 4%. We seek to explain this discrepancy by investigating Japanese fuel economy standards and the financial incentives given to consumers of fuel-efficient cars. To do so, this study explores whether Japanese policies caused such a rebound effect, by employing the difference-in-difference framework. We find that these policies contribute to energy rebound effect, by enabling higher fuel consumption at lower costs and thus causing higher energy usages. We provide evidence that policies can increase not only fuel usage but also fuel costs. The main driving force behind the rebound effect is the increase in the sales of hybrid vehicles, induced by financial incentives.
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