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Technical Brief

PI-Controller Design for Combustion-Timing Feedback, from n-Heptane to iso-Octane in Compression-Ignition Engines

[+] Author and Article Information
Gabriel Ingesson

Department of Automatic Control, Lund University, Sweden
gabriel.ingesson@control.lth.se

Lianhao Yin

Department of Energy Sciences, Lund University, Sweden
Lianhao.Yin@energy.lth.se

Rolf Johansson

Department of Automatic Control, Lund University, Sweden
Rolf.Johansson@control.lth.se

Per Tunestal

Department of Energy Sciences, Lund University, Sweden
per.tunestal@energy.lth.se

1Corresponding author.

ASME doi:10.1115/1.4037834 History: Received November 30, 2016; Revised August 16, 2017

Abstract

The problem of designing robust and noise-insensitive PI controllers for pressure-sensor based combustion-timing control was studied through simulation. Different primary reference fuels (PRF) and operating conditions were studied. The simulations were done using a physics-based, control-oriented model with an empirical ignition-delay correlation. It was found that the controllable region, in-between the zero-gain region for early injection timings and the misfire region for late injection timings is strongly PRF dependent. As a result, it was necessary to adjust intake temperature to compensate for the difference in fuel reactivity prior to the controller design. With adjusted intake temperature, PRF dependent negative-temperature coefficient behavior gave different system characteristics for the different fuels. The PI-controller design was accomplished by solving the optimization problem of maximizing disturbance rejection and tracking performance subject to constraints on robustness and measurement-noise sensitivity. Optimal controller gains were found to be limited by the high system gain at late combustion timings and high-load conditions, furthermore, the measurement-noise sensitivity was found to be higher at the low-load operating points where the ignition delay is more sensitive to variations in load and intake-conditions. The controller-gain restrictions were found to vary for the different PRFs, the optimal gains for higher PRFs were lower due to a higher system gain, whereas the measurement-noise sensitivity was found to be higher for lower PRFs.

Copyright (c) 2017 by ASME
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