HyPACE – Hybrid Petrol Advanced Combustion Engine

Autoren

Adrian Cooper, Simon Reader, Dr. Mike Bassett, Jonathan Hall, Dr. Phil Stansfield,
MAHLE Powertrain Limited, Northampton;
Dr. Jonathan Hartland, Dr. Li Cao,
Jaguar Land Rover Limited, Coventry;
Andrew Taylor,
BorgWarner Turbo Systems, Bradford

Zusammenfassung

The HyPACE (Hybrid Petrol Advanced Combustion Engine) project is a part UK government funded research project, combining the capabilities of Jaguar Land Rover, BorgWarner, MAHLE Powertrain, Johnson Matthey, Cambustion and Oxford University, to develop a high thermal efficiency gasoline engine optimised for application in Mild Hybrid Electric Vehicles (MHEVs) and Plug-in Hybrid Electric
Vehicles (PHEVs). The project is focussed on combining a novel combination of technologies with the target of achieving a 10 % fuel consumption benefit relative to the baseline donor engine, whilst still achieving 90 to 100 kW/litre and whole area lambda 1 operation.

The donor engine for this study is the new Jaguar Land Rover Ingenium 4 cylinder gasoline engine, which includes an advanced continuously variable intake valve actuation system. A concept study has been undertaken and detailed CFD models developed to enable the optimisation of the combustion system for a higher
compression ratio (CR) of 12.5:1. Gas-dynamic simulations were used to configure the Exhaust Gas Recirculation (EGR) systems and the revised boosting system that features a BorgWarner 48V electrically assisted turbocharger with a Variable Geometry Turbine (VTG). This is capable of providing waste exhaust energy recovery through the generation of electricity. The EGR system includes both high and low pressure circuits, and features a fuel reformer in the high-pressure loop, enabling the generation of gaseous hydrogen. Previous studies have shown that the presence of hydrogen enables stable combustion with higher EGR rates than can be
accommodated without it.

Initial simulation results indicate that the higher CR, combined with Miller cycle operation could enable up to a 4 % fuel consumption reduction. With the addition of the EGR and the fuel reformation this could be extended by a further 3 %. In conjunction with an electrically heated catalyst and an improvement in air-path efficiency, the total drive-cycle fuel consumption benefit achievable from the combination of technologies studied is anticipated to be up to 10 %. Testing of the engine and modified hardware is currently still underway and is scheduled to be completed in the summer of 2018.

This paper focuses on the results of the testing to investigate the potential benefits of using the BorgWarner 48V electrically assisted VTG turbocharger (eTurbo™).

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