The need for cost-effective fuel economy improvements has driven the introduction of automatic transmissions with an increasing number of gear ratios. Incorporation of interlocking dog clutches in these transmissions decreases package space and increases efficiency, as compared to conventional dry or wet clutches. Unlike friction-based clutches, interlocking dog clutches require very precise rotational speed matching prior to engagement. Precise engine speed control is, therefore, critical to maintaining high shift quality. This research focuses on controlling the engine speed during a gearshift period by manipulating throttle position and combustion phasing. Model predictive control (MPC) is advantageous in this application since the speed profile of a future prediction horizon is known with relatively high confidence. The MPC can find the optimal control actions to achieve the designated speed target without invoking unnecessary actuator manipulation and violating hardware and combustion constraints. This research utilizes linear parameter varying (LPV) MPC to control the engine speed during the gearshift period. Combustion stability constraints are considered with a control-oriented covariance of indicated mean effective pressure model (COV of IMEP). The proposed MPC engine speed controller is validated with a high-fidelity zero-dimensional engine model with crank angle resolution. Four case studies, based on simulation, investigate the impact of different MPC design parameters. They also demonstrate that the proposed MPC engine controller successfully achieves the speed reference tracking objective while considering combustion variation constraints.
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November 2017
Research-Article
Model Predictive Engine Speed Control for Transmissions With Dog Clutches
Qilun Zhu,
Qilun Zhu
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
e-mail: qilun@g.clemson.edu
Clemson University,
Greenville, SC 29607
e-mail: qilun@g.clemson.edu
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Robert Prucka,
Robert Prucka
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
Clemson University,
Greenville, SC 29607
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Hussein Dourra
Hussein Dourra
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Qilun Zhu
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
e-mail: qilun@g.clemson.edu
Clemson University,
Greenville, SC 29607
e-mail: qilun@g.clemson.edu
Robert Prucka
Automotive Engineering Department,
Clemson University,
Greenville, SC 29607
Clemson University,
Greenville, SC 29607
Michael Prucka
Hussein Dourra
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 28, 2017; final manuscript received April 25, 2017; published online June 6, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Nov 2017, 139(11): 112803 (11 pages)
Published Online: June 6, 2017
Article history
Received:
February 28, 2017
Revised:
April 25, 2017
Citation
Zhu, Q., Prucka, R., Prucka, M., and Dourra, H. (June 6, 2017). "Model Predictive Engine Speed Control for Transmissions With Dog Clutches." ASME. J. Eng. Gas Turbines Power. November 2017; 139(11): 112803. https://doi.org/10.1115/1.4036622
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