Abstract
Reactivity controlled compression ignition (RCCI) combustion has been shown to provide simultaneous ultra-low NOx and soot emissions with similar or better thermal efficiencies than conventional diesel combustion (CDC). Nonetheless, RCCI still has several challenges that restrict its operating range and limit its practical application. The dual-mode operation, which involves switching between different combustion modes, has been found as a promising alternative to operation in the whole engine map. However, the combustion mode switching requires difficult engine control, particularly during transient operation. The series hybrid vehicle (SHV) architecture allows the thermal engine to operate in a limited operating range by decoupling it from the drivetrain. Therefore, it could be an interesting alternative to the dual-mode concept. This work explores the potential of the RCCI series hybrid vehicle architecture to provide low engine-out emissions and CO2 by means of vehicle systems simulations. The results show the influence of the main parameters and control strategies of the SHV vehicle on its efficiency and emissions under different driving cycles. Finally, the optimal RCCI-SHV configuration is compared to CDC and dual-mode combustion strategies, confirming its potential as a future vehicle architecture for high efficiency and low emissions.
Highlights
The future requirements regarding engine-out emissions and greenhouse gas (GHG) pollutants have been encouraging both engine original equipment manufacturers (OEMs) and the scientific community to search for alternative solutions to meet the normative constraints
The most expensive after-treatment system for vehicles operating with conventional diesel combustion is the selective catalytic reduction (SCR), which is used to reduce the levels of NOx emissions at the tailpipe
The objective of the first is to find the optimal values for the state of charge (SOC) and the number of operating conditions to be run with the internal for the state of charge (SOC) and the number of operating conditions to be run with the internal combustion engine (ICE), which is achieved through a series of parametric studies
Summary
The future requirements regarding engine-out emissions and greenhouse gas (GHG) pollutants have been encouraging both engine original equipment manufacturers (OEMs) and the scientific community to search for alternative solutions to meet the normative constraints. New combustion modes are being developed aiming to reduce some of the raw emissions at a normative level. Among these combustion modes, the so-called low-temperature combustion (LTC) is receiving particular attention as this strategy can directly reduce the needs regarding after-treatment devices. The so-called low-temperature combustion (LTC) is receiving particular attention as this strategy can directly reduce the needs regarding after-treatment devices This has fundamental importance, as these systems make up a large part of the final cost of the vehicle. The most expensive after-treatment system for vehicles operating with conventional diesel combustion is the selective catalytic reduction (SCR), which is used to reduce the levels of NOx emissions at the tailpipe
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