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Impact of Electrically Assisted Turbocharger on the Intake Oxygen Concentration and Its Disturbance Rejection Control for a Heavy-duty Diesel Engine

Author

Listed:
  • Chao Wu

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Kang Song

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Shaohua Li

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Hui Xie

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

Abstract

The electrically assisted turbocharger (EAT) shows promise in simultaneously improving the boost response and reducing the fuel consumption of engines with assist. In this paper, experimental results show that 7.8% fuel economy (FE) benefit and 52.1% improvement in transient boost response can be achieved with EAT assist. EAT also drives the need for a new feedback variable for the air system control, instead of the exhaust recirculation gas (EGR) rate that is widely used in conventional turbocharged engines (nominal system). Steady-state results show that EAT assist allows wider turbine vane open and reduces pre-turbine pressure, which in turn elevates the engine volumetric efficiency hence the engine air flow rate at fixed boost pressure. Increased engine air flow rate, together with the reduced fuel amount necessary to meet the torque demand with assist, leads to the increase of the oxygen concentration in the exhaust gas (EGR gas dilution). Additionally, transient results demonstrate that the enhanced air supply from the compressor and the diluted EGR gas result in a spike in the oxygen concentration in the intake manifold ( X oim ) during tip-in, even though there is no spike in the EGR rate response profile. Consequently, there is Nitrogen Oxides (NOx) emission spike, although the response of boost pressure and EGR rate is smooth (no spike is seen). Therefore, in contrast to EGR rate, X oim is found to be a better choice for the feedback variable. Additionally, a disturbance observer-based X oim controller is developed to attenuate the disturbances from the turbine vane position variation. Simulation results on a high-fidelity GT-SUTIE model show over 43% improvement in disturbance rejection capability in terms of recovery time, relative to the conventional proportional-integral-differential (PID) controller. This X oim -based disturbance rejection control solution is beneficial in the practical application of the EAT system.

Suggested Citation

  • Chao Wu & Kang Song & Shaohua Li & Hui Xie, 2019. "Impact of Electrically Assisted Turbocharger on the Intake Oxygen Concentration and Its Disturbance Rejection Control for a Heavy-duty Diesel Engine," Energies, MDPI, vol. 12(15), pages 1-22, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:3014-:d:254949
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    References listed on IDEAS

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    1. Aghaali, Habib & Ångström, Hans-Erik, 2015. "A review of turbocompounding as a waste heat recovery system for internal combustion engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 813-824.
    2. Briggs, Ian & McCullough, Geoffrey & Spence, Stephen & Douglas, Roy, 2014. "Whole-vehicle modelling of exhaust energy recovery on a diesel-electric hybrid bus," Energy, Elsevier, vol. 65(C), pages 172-181.
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    Cited by:

    1. Dariusz Kozak & Paweł Mazuro & Andrzej Teodorczyk, 2021. "Numerical Simulation of Two-Stage Variable Geometry Turbine," Energies, MDPI, vol. 14(17), pages 1-34, August.
    2. Gengjin Shi & Zhenlong Wu & Jian Guo & Donghai Li & Yanjun Ding, 2020. "Superheated Steam Temperature Control Based on a Hybrid Active Disturbance Rejection Control," Energies, MDPI, vol. 13(7), pages 1-26, April.
    3. Roberto Capata, 2021. "Experimental Fitting of Redesign Electrified Turbocompressor of a Novel Mild Hybrid Power Train for a City Car," Energies, MDPI, vol. 14(20), pages 1-20, October.

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