Abstract
Electrical turbocharger assist is one of the most critical technologies in improving fuel efficiency of conventional powertrain vehicles. However, strong challenges lie in high efficient operations of the device due to its complexity. In this paper, an integrated framework on characterization, control, and testing of the electrical turbocharger assist is proposed. Starting from a physical characterization of the engine, the controllability and the impact of the electrical turbocharger assist on fuel economy and exhaust emissions are both analyzed. A multivariable robust controller is designed to regulate the dynamics of the electrified turbocharged engine in a systematic approach. To minimize the fuel consumption in real time, a supervisory level controller is designed to update the setpoints of key controlled variables in an optimal way. Furthermore, a cutting-edge experimental platform based on a heavy-duty diesel engine is built. The proposed framework has been evaluated in simulations, physical simulations, and experiments. Results are presented for the developed system and the proposed framework that demonstrate excellent tracking performance, high robustness, and the potential for improvements in fuel efficiency.
Highlights
I N THE coming decades, efforts are required to achieve the GHG emissions reduction target made in the Paris Climate Change Conference 2015
The average engine operating points are closer to its high fuel efficiency zone at high loads
The fuel economy benefits are achieved through reduced friction, reduced heat transfer across the cylinder walls, and reduced pumping losses
Summary
I N THE coming decades, efforts are required to achieve the GHG emissions reduction target made in the Paris Climate Change Conference 2015. In VGT-equipped engines, part of the exhaust gas energy is used to accelerate the turbine shaft for boosting, both engine transient response and fuel economy are improved. The electric supercharger increases the intake air mass flow, and improves the transient response, especially at low engine speeds. Detroit Diesel has conceptualized a prototype electrically assisted turbocharger to improve transient response and enhance exhaust energy recovery capability [13]. Honeywell presented their early design and development of electrical assist technology on diesel engines, referred to as e-Turbo [14]. 1) Physical characterization of the ETDE, in particular the controllability analysis and the impact of ETA on fuel economy and exhaust emissions.
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