Investigating the engine behavior of a hybrid vehicle and its impact on regulated emissions during on-road testing. University of Leeds, UK

Format:

Book

Conference/Event

Author/Creator:

Thomas, Daisy, author.

Contributor:

Ge, Yunshan

Li, Hu

Ropkins, Karl

Wang, Xin

Conference Name:

2019 JSAE/SAE Powertrains, Fuels and Lubricants (2019-08-26 : Kyoto, Japan)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2019

Summary:

This paper presents the emissions results and operational behavior of two hybrid vehicles over EU legislative Real Driving Emissions (RDE) and other on-road testing cycles. The behavior of one hybrid vehicle during real world driving is investigated, including analyses of air-fuel ratio and catalyst temperature changes, in order to elucidate the reasons for the emissions results seen in the other hybrid vehicle over an RDE cycle. It was observed that the catalyst cooled down over time when the hybrid vehicle SI (Spark Ignition) engine was turned off, meaning that when the engine restarted the catalyst efficiency was decreased until it was able to light-off once again. This leads to increases in the tailpipe emissions of CO, NOx and hydrocarbons after the engine restarts. In addition to this problem, the engine restarts demanded fuel enrichment, which resulted in incomplete combustion and further increases in CO and PN emissions. Finally, the rate of catalyst temperature decrease during engine-off and increase during engine start/restart were also investigated and quantified for one of the hybrid vehicles

Notes:

Vendor supplied data

Publisher Number:

2019-01-2199

Access Restriction:

Restricted for use by site license