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A test evaluation method for the emissions and fuel economy of heavy duty hybrid electric vehicles (HD-HEVs) was developed, which was implemented on a standard track with an integrated onboard measurement system (IOMS). One home-made hybrid electric bus (HEB) and a conventional diesel bus were tested with the presented procedure. The track test adopted a city-bus cycle which was developed and formed through bus driving modes collection in several typical megacities of China. The feasibility and effectiveness of the presented method and procedure were validated in the track tests: the test cycle can be well followed with a high unity more than 0.97 and a R2 more than 0.99 by a driver after only a few hours training, and the on-board measurement system performed with a good reliability.

With the rapid expansion of the automotive market in China, air quality in the major cities has become a severe concern. Great efforts have been made in introducing new emission regulations; however, fuel and lubricant qualities, emissions aftertreatment system durability and in-use compliance to the emissions regulations still require significant improvement. China follows the European Union (EU) emission regulations in general, but different levels of standards exist. This paper gives a comprehensive overview of the current and near-future heavy-duty diesel emission regulations, as well as fuel and lubricant specifications.