At the present time, both control and estimation accuracies of engine torque are causes for underachieving optimal drivability and performance in today's production vehicles. The major focus in this area has been to enhance torque estimation and control accuracies using existing open loop torque control and estimation structures. Such an approach does not guarantee optimum torque tracking accuracy and optimum estimation accuracy due to air flow and efficiency estimation errors. Furthermore, current approach overlooks the fast torque path tracking which does not have any related feedback. Recently, explicit torque feedback control has been proposed in the literature using either estimated or measured torques as feedback to control the torque using the slow torque path only. We propose the usage of a surface acoustic wave (SAW) torque sensor to measure the engine brake torque and feedback the signal to control the torque using both the fast and slow torque paths utilizing an inner–outer loop control structure. The fast torque path feedback is coordinated with the slow torque path by a novel method using the potential torque that is adapted to the sensor reading. The torque sensor signal enables a fast and explicit torque feedback control that can correct torque estimation errors and improve drivability, emission control, and fuel economy. Control oriented engine models for the 3.6L engine are developed. Computer simulations are performed to investigate the advantages and limitations of the proposed control strategy versus the existing strategies. The findings include an improvement of 14% in gain margin and 60% in phase margin when the torque feedback is applied to the cruise control torque request at the simulated operating point. This study demonstrates that the direct torque feedback is a powerful technology with promising results for improved powertrain performance and fuel economy.
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November 2016
Research-Article
Direct Torque Feedback for Accurate Engine Torque Delivery and Improved Powertrain Performance
Anwar Alkeilani,
Anwar Alkeilani
Department of Electrical and Computer
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: am2298@wayne.edu
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: am2298@wayne.edu
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Le Yi Wang,
Le Yi Wang
Department of Electrical and Computer
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: lywang@wayne.edu
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: lywang@wayne.edu
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Hao Ying
Hao Ying
Department of Electrical and Computer
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: hao.ying@wayne.edu
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: hao.ying@wayne.edu
Search for other works by this author on:
Anwar Alkeilani
Department of Electrical and Computer
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: am2298@wayne.edu
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: am2298@wayne.edu
Le Yi Wang
Department of Electrical and Computer
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: lywang@wayne.edu
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: lywang@wayne.edu
Hao Ying
Department of Electrical and Computer
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: hao.ying@wayne.edu
Engineering,
Wayne State University,
Detroit, MI 48202
e-mail: hao.ying@wayne.edu
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 2, 2016; final manuscript received March 10, 2016; published online May 3, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. Nov 2016, 138(11): 112801 (13 pages)
Published Online: May 3, 2016
Article history
Received:
February 2, 2016
Revised:
March 10, 2016
Citation
Alkeilani, A., Wang, L. Y., and Ying, H. (May 3, 2016). "Direct Torque Feedback for Accurate Engine Torque Delivery and Improved Powertrain Performance." ASME. J. Eng. Gas Turbines Power. November 2016; 138(11): 112801. https://doi.org/10.1115/1.4033257
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