The Experts below are selected from a list of 720 Experts worldwide ranked by ideXlab platform

C. M. Meano - One of the best experts on this subject based on the ideXlab platform.

  • Effect of the inlet geometry on performance, surge margin and noise emission of an automotive turbocharger compressor
    Applied Thermal Engineering, 2017
    Co-Authors: Juan Galindo, Andres Tiseira, D. Tarí, R Navarro, C. M. Meano
    Abstract:

    Centrifugal compressor performance at low mass flow rates has become an issue in the latest years due to Engine Downsizing and the increase of low-end torque request. The principal drawback of this operating region is the appearance of the surge phenomenon, which is strongly affected by the compressor inlet geometry. This work is addressed to study the impact of different inlet geometries on the compressor performance, including compressor efficiency, noise emission and surge margin. An Engine test bench is set up with a centrifugal compressor and both steady and transient (tip-out) tests are performed in order to obtain a complete view of the influence of each configuration. The results show a clear sensitivity of the compressor parameters to the variations of the geometry upstream the compressor inlet.

Thomas Steffen - One of the best experts on this subject based on the ideXlab platform.

  • CDC - Robust control of electrified turbocharged diesel Engines
    2016 IEEE 55th Conference on Decision and Control (CDC), 2017
    Co-Authors: Dezong Zhao, Edward Winward, Richard Stobart, Zhijia Yang, Thomas Steffen
    Abstract:

    Electrified turbocharger is a critical technology for Engine Downsizing and is a cost-effective solution for exhaust gas energy recovery. In conventional turbocharged diesel Engines, the air path holds strong nonlinearity since the actuators are all driven by the exhaust gas. In an electrified turbocharged diesel Engine (ETDE), the coupling is more complex, due to the electric machine mounted on the turbine shaft impacts the exhaust manifold dynamics as well. In distributed single-input single-output control methods, the gains tuning is time consuming and the couplings are ignored. To control the performance variables independently, developing a promising multi-input multi-output control method for the ETDE is essential. In this paper, a model-based multi variable robust controller is designed to control the performance variables in a systematic way. Both simulation and experimental results verified the effectiveness of the proposed controller.

  • ACC - Decoupling control of electrified turbocharged diesel Engines
    2016 American Control Conference (ACC), 2016
    Co-Authors: Dezong Zhao, Edward Winward, Richard Stobart, Zhijia Yang, Thomas Steffen
    Abstract:

    Engine electrification is a critical technology in the promotion of Engine fuel efficiency, among which the electrified turbocharger is regarded as a promising solution for its advantages in Engine Downsizing and exhaust gas energy recovery. By installing electrical devices on the turbocharger, the excess energy can be captured, stored, and re-used. The control of the energy flows in an electrified turbocharged diesel Engine (ETDE) is still in its infancy. Developing a promising multi-input multi-output (MIMO) control strategy is essential in exploring the maximum benefits of electrified turbocharger. In this paper, the dynamics in an ETDE, especially the couplings among multiple loops in the air path are analyzed. Based on the analysis, a model-based MIMO decoupling control framework is designed to regulate the air path dynamics. The proposed control strategy can achieve fast and accurate tracking on selected control variables and is successfully validated on a physical model in simulations.

  • Robust control of electrified turbocharged diesel Engines
    2016 IEEE 55th Conference on Decision and Control CDC 2016, 2016
    Co-Authors: D. Zhao, Zhisheng Yang, Richard Stobart, Edward Winward, Thomas Steffen
    Abstract:

    © 2016 IEEE. Electrified turbocharger is a critical technology for Engine Downsizing and is a cost-effective solution for exhaust gas energy recovery. In conventional turbocharged diesel Engines, the air path holds strong nonlinearity since the actuators are all driven by the exhaust gas. In an electrified turbocharged diesel Engine (ETDE), the coupling is more complex, due to the electric machine mounted on the turbine shaft impacts the exhaust manifold dynamics as well. In distributed single-input single-output control methods, the gains tuning is time consuming and the couplings are ignored. To control the performance variables independently, developing a promising multi-input multi-output control method for the ETDE is essential. In this paper, a model-based multi variable robust controller is designed to control the performance variables in a systematic way. Both simulation and experimental results verified the effectiveness of the proposed controller.

Richard Stobart - One of the best experts on this subject based on the ideXlab platform.

  • Real-Time Energy Management of the Electric Turbocharger Based on Explicit Model Predictive Control
    IEEE Transactions on Industrial Electronics, 2020
    Co-Authors: Dezong Zhao, Richard Stobart, Byron Mason
    Abstract:

    The electric turbocharger (ET) is a promising solution for Engine Downsizing. It provides great potential for vehicle fuel efficiency improvement. The ET makes Engines run as hybrid systems so critical challenges are raised in energy management and control. This paper proposes a real-time energy management strategy based on updating and tracking of the optimal exhaust pressure setpoint. Starting from the Engine characterization, the impacts of the ET on Engine response and exhaust emissions are analyzed. A multivariable explicit model predictive controller is designed to regulate the key variables in the Engine air system, whereas the optimal setpoints of those variables are generated by a high-level controller. The two-level controller works in a highly efficient way to fulfill the optimal energy management. This strategy has been validated in physical simulations and experimental testing. Excellent tracking performance and sustainable energy management demonstrate the effectiveness of the proposed method.

  • CDC - Robust control of electrified turbocharged diesel Engines
    2016 IEEE 55th Conference on Decision and Control (CDC), 2017
    Co-Authors: Dezong Zhao, Edward Winward, Richard Stobart, Zhijia Yang, Thomas Steffen
    Abstract:

    Electrified turbocharger is a critical technology for Engine Downsizing and is a cost-effective solution for exhaust gas energy recovery. In conventional turbocharged diesel Engines, the air path holds strong nonlinearity since the actuators are all driven by the exhaust gas. In an electrified turbocharged diesel Engine (ETDE), the coupling is more complex, due to the electric machine mounted on the turbine shaft impacts the exhaust manifold dynamics as well. In distributed single-input single-output control methods, the gains tuning is time consuming and the couplings are ignored. To control the performance variables independently, developing a promising multi-input multi-output control method for the ETDE is essential. In this paper, a model-based multi variable robust controller is designed to control the performance variables in a systematic way. Both simulation and experimental results verified the effectiveness of the proposed controller.

  • ACC - Decoupling control of electrified turbocharged diesel Engines
    2016 American Control Conference (ACC), 2016
    Co-Authors: Dezong Zhao, Edward Winward, Richard Stobart, Zhijia Yang, Thomas Steffen
    Abstract:

    Engine electrification is a critical technology in the promotion of Engine fuel efficiency, among which the electrified turbocharger is regarded as a promising solution for its advantages in Engine Downsizing and exhaust gas energy recovery. By installing electrical devices on the turbocharger, the excess energy can be captured, stored, and re-used. The control of the energy flows in an electrified turbocharged diesel Engine (ETDE) is still in its infancy. Developing a promising multi-input multi-output (MIMO) control strategy is essential in exploring the maximum benefits of electrified turbocharger. In this paper, the dynamics in an ETDE, especially the couplings among multiple loops in the air path are analyzed. Based on the analysis, a model-based MIMO decoupling control framework is designed to regulate the air path dynamics. The proposed control strategy can achieve fast and accurate tracking on selected control variables and is successfully validated on a physical model in simulations.

  • Control-oriented dynamics analysis for electrified turbocharged diesel Engines
    SAE Technical Paper Series, 2016
    Co-Authors: Dezong Zhao, Edward Winward, Zhijia Yang, John Rutledge, Richard Stobart
    Abstract:

    Engine electrification is a critical technology in the promotion of Engine fuel efficiency, among which the electrified turbocharger is regarded as the promising solution in Engine Downsizing. By installing electrical devices on the turbocharger, the excess energy can be captured, stored, and re-used. The electrified turbocharger consists of a variable geometry turbocharger (VGT) and an electric motor (EM) within the turbocharger bearing housing, where the EM is capable in bi-directional power transfer. The VGT, EM, and exhaust gas recirculation (EGR) valve all impact the dynamics of air path. In this paper, the dynamics in an electrified turbocharged diesel Engine (ETDE), especially the couplings between different loops in the air path is analyzed. Furthermore, an explicit principle in selecting control variables is proposed. Based on the analysis, a model-based multi-input multi-output (MIMO) decoupling controller is designed to regulate the air path dynamics. The dynamics analysis and controller are successfully validated through experiments and simulations.

  • Robust control of electrified turbocharged diesel Engines
    2016 IEEE 55th Conference on Decision and Control CDC 2016, 2016
    Co-Authors: D. Zhao, Zhisheng Yang, Richard Stobart, Edward Winward, Thomas Steffen
    Abstract:

    © 2016 IEEE. Electrified turbocharger is a critical technology for Engine Downsizing and is a cost-effective solution for exhaust gas energy recovery. In conventional turbocharged diesel Engines, the air path holds strong nonlinearity since the actuators are all driven by the exhaust gas. In an electrified turbocharged diesel Engine (ETDE), the coupling is more complex, due to the electric machine mounted on the turbine shaft impacts the exhaust manifold dynamics as well. In distributed single-input single-output control methods, the gains tuning is time consuming and the couplings are ignored. To control the performance variables independently, developing a promising multi-input multi-output control method for the ETDE is essential. In this paper, a model-based multi variable robust controller is designed to control the performance variables in a systematic way. Both simulation and experimental results verified the effectiveness of the proposed controller.

Sam Akehurst - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of supercharging boosting component for heavily downsized gasoline Engines
    11th International Conference on Turbochargers and Turbocharging, 2020
    Co-Authors: Alessandro Romagnoli, Ricardo F. Martinez-botas, W.s.-i. Wan-salim, Balamurugan A. Gurunathan, James Turner, N. Luard, R. Jackson, L. Matteucci, Colin Copeland, Sam Akehurst
    Abstract:

    Current trend on Engine Downsizing forces Engine manufacturers to contemplate powertrains with more than one boosting device. The presence of these devices leads to complex 1-D Engine models which rely on performance maps provided by turbo/supercharger manufacturers. So far, no detailed analysis has been carried out to understand how these maps affect Engine performance simulation. As part of the UltraBoost project (65% gasoline Engine Downsizing), Imperial College tested the boosting components of a turbo-super configuration. The acquired data were used to assess the effectiveness of 1-D Engine performance prediction and to contemplate the opportunity to exploit the boosting system and use it as Engine charge air cooler in the form of an expander.

  • Observations on and Potential Trends for Mechanically Supercharging a Downsized Passenger Car Engine: a Review
    Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2016
    Co-Authors: Bo Hu, Sam Akehurst, Chris Brace, James Turner, Colin Copeland
    Abstract:

    Engine Downsizing is a proven approach for achieving a superior fuel efficiency. It is conventionally achieved by reducing the swept volume of the Engine and by employing some means of increasing the specific output to achieve the desired installed Engine power, usually in the form of an exhaust-driven turbocharger. However, because of the perceptible time needed for the turbocharger system to generate the required boost pressure, a characteristic of turbocharged Engines is their degraded driveability in comparison with those of their naturally aspirated counterparts. Mechanical supercharging refers to the technology that compresses the intake air using the energy taken directly from the Engine crankshaft. It is anticipated that Engine Downsizing which is realised either solely by a supercharger or by a combination of a supercharger and a turbocharger will enhance a vehicle’s driveability without significantly compromising the fuel consumption at an Engine level compared with the Downsizing by turbochargi...

  • Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition Engines: A review
    International Journal of Engine Research, 2015
    Co-Authors: Bo Hu, Sam Akehurst, Christian J Brace
    Abstract:

    Engine Downsizing, which is the use of a smaller Engine that provides the power of a larger Engine, is now considered a mega-trend for the internal combustion Engine market. It is usually achieved using one or more boosting devices including a supercharger or a turbocharger. Although supercharging is beneficial for Engine’s transient response, turbocharging technology is more widely adopted considering its advantages in fuel efficiency. Compared to turbocharged compression ignition Engines, turbocharged spark-ignition Engines tend to be more challenging with respect to the gas exchange process mainly due to their higher pumping loss, the need for throttling and the fact that spark-ignition Engines demand more controllability due to the mitigation of knock, particularly with regard to minimizing trapped residuals. These challenges encourage the entire gas exchange process of turbocharged spark-ignition Engines to be regarded as a complete air management system instead of just looking at the boosting system...

  • supergen on ultraboost variable speed centrifugal supercharging as an enabling technology for extreme Engine Downsizing
    SAE International journal of engines, 2015
    Co-Authors: J W G Turner, Sam Akehurst, A Popplewell, T R Johnson, D J Marshall, L Barker, J King, J Martin, Andrew Lewis, Chris Brace
    Abstract:

    The paper discusses investigations into improving the full-load and transient performance of the Ultraboost extreme Downsizing Engine by the application of the SuperGen variable-speed centrifugal supercharger. Since its output stage speed is decoupled from that of the crankshaft, SuperGen is potentially especially attractive in a compound pressure-charging system. Such systems typically comprise a turbocharger, which is used as the main charging device, compounded at lower charge mass flow rates by a supercharger used as a second boosting stage. Because of its variable drive ratio, SuperGen can be blended in and out continuously to provide seamless driveability, as opposed to the alternative of a clutched, single-drive-ratio positive-displacement device. In this respect its operation is very similar to that of an electrically-driven compressor, although it is voltage agnostic and can supply other hybrid functionality, too. In the work reported here a prototype SuperGen unit was tested on the Ultraboost extreme Downsizing demonstrator Engine and the performance compared to that of the originally-specified positive-displacement device. This Engine has previously been described in detail and represents a 60% Downsizing factor versus a 5.0 litre naturally-aspirated V8, although the ‘standard’ baseline combination of supercharger and turbocharger was found in earlier work to be a limitation on achieving the full Downsizing factor at low Engine speed. The improvement in full-load performance in the area where the turbocharger cannot generate the required boost by itself is reported. The transient response of the combined system at low Engine speed is also presented, together with part-load fuel economy data at several Engine speed and load points. Finally, this part-load data is used for vehicle modelling work showing that a more-efficient high-pressure stage can bring further fuel economy benefits to extremely-downsized vehicle applications.

  • A review of the application of variable geometry turbines to the downsized gasoline Engine
    International Journal of Engine Research, 2014
    Co-Authors: Huayin Tang, Sam Akehurst, Andrew Pennycott, Chris Brace
    Abstract:

    Engine Downsizing through turbocharging is a proven method of improving fuel economy by using a smaller Engine operating at higher levels of specific Engine load and higher efficiency. Turbocharging is more challenging for the gasoline Engine than the diesel Engine due to the higher variability in the flow rate of air and the higher exhaust gas temperature. Although the variable geometry turbine offers the potential for improving the low-end torque, lowering part-load fuel consumption and delivering a fast transient response on a downsized gasoline Engine, the cost, durability and the limited allowable turbine inlet temperature on the currently available devices present challenges to widespread application. This article details the main operating principles and types of the variable geometry turbine, its potential to deliver performance improvements, implementation challenges on the gasoline Engine and the measures available to alleviate those challenges. Of the available types of variable geometry turbin...

Juan Galindo - One of the best experts on this subject based on the ideXlab platform.

  • Effect of the inlet geometry on performance, surge margin and noise emission of an automotive turbocharger compressor
    Applied Thermal Engineering, 2017
    Co-Authors: Juan Galindo, Andres Tiseira, D. Tarí, R Navarro, C. M. Meano
    Abstract:

    Centrifugal compressor performance at low mass flow rates has become an issue in the latest years due to Engine Downsizing and the increase of low-end torque request. The principal drawback of this operating region is the appearance of the surge phenomenon, which is strongly affected by the compressor inlet geometry. This work is addressed to study the impact of different inlet geometries on the compressor performance, including compressor efficiency, noise emission and surge margin. An Engine test bench is set up with a centrifugal compressor and both steady and transient (tip-out) tests are performed in order to obtain a complete view of the influence of each configuration. The results show a clear sensitivity of the compressor parameters to the variations of the geometry upstream the compressor inlet.