Turbocompounding is a promising waste heat recovery technology to improve fuel economy of internal combustion engines and comply with increasingly stringent emission regulations. The performance of a turbocompound engine is significantly influenced by the matching of the turbocharger turbine and the power turbine. Conventionally, the matching of the turbocharger turbine and power turbine is carried out at a single operating point. Single-point matched turbocompound systems tends to have poor performance at off-design operating conditions, which restrained the fuel-saving potential of turbocompound engines under driving cycle conditions.
In the present study, a multipoint matching method for turbocompound systems was developed, which was essentially an optimization process of the swallowing capacities of the turbocharger turbine and the power turbine to achieve best performance at multiple matching points. In order to improve the performance of turbocompound engines under driving cycle conditions, common operating points of a driving cycle were used as matching points in the matching process. Common operating points under a driving cycle were determined by clustering the dynamic profiles of the driving cycle.
A simulation study was carried out to examine the effectiveness of the multipoint matching method. The performance of the multipoint matched turbocompound system was compared against two single-point matched turbocompound systems under stationary operating points and driving cycle conditions respectively. According to the simulation results, the multipoint matched turbocompound system could attain satisfactory BSFC benefit under a wider operating range when compared with the two single-point matched turbocompound systems. The multipoint matched turbocompound engine showed the largest reduction in fuel consumption under driving cycle conditions.