Hybrid electric vehicles (HEVs) provide a promising alternative to conventional engine-powered vehicles, with less emission and better fuel economy. This study proposes a hierarchical control for a power-split HEV over a driving cycle, featuring pre-trip optimisation and en-route speed adaption. Constraints including vehicle powertrain boundaries, road gradients, and speed limits, are taken into consideration. In the first stage, the HEV operating conditions, including the optimal vehicle SOC, speed profiles, and total driving time, are generated for the entire trip before departure. Based on the pre-trip results, the second stage adapts the vehicle speed for a short horizon when driving, while taking the safety spacing to the preceding vehicle into consideration, which acts as an indicator of actual traffic conditions and guarantees safe driving. Both optimisations are conducted under the distance domain for realising localisation in the optimal speed profile due to frequent changes in traffic conditions. An estimation of distribution algorithm is used to run the simulation so that the feasibility, robustness, and effectiveness of the proposed hierarchical control can be demonstrated.
Distance-oriented hierarchical control and ecological driving strategy for HEVs
IET Electrical Systems in Transportation ; 9 , 1 ; 44-52
2019-01-09
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
actual traffic conditions , HEVs , ecological driving strategy , pre-trip optimisation , driving cycle , hierarchical control , promising alternative , conventional engine-powered vehicles , hybrid electric vehicles , road gradients , vehicle powertrain boundaries , hierarchical systems , power transmission (mechanical) , vehicle speed , preceding vehicle , optimal speed profile , battery powered vehicles , distance-oriented hierarchical control , fuel economy , pre-trip results , HEV operating conditions , safe driving , optimal vehicle SOC , speed limits , entire trip , power-split HEV , en-route speed adaption , speed profiles , total driving time , optimisations , distance domain
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