Controls-oriented modelling and LQR control of natural gas HCCI engines

Marwa AbdelGawad, Reza Tafreshi, Reza Langari

Research output: Contribution to journalArticle


Homogeneous charge compression ignition (HCCI) engines have been proposed as a solution to designing efficient engines that follow emission regulations set by the US Environmental Protection Agency. The main idea behind HCCI engines is to combust a lean, homogeneous air-fuel mixture using compression. However, due to the fact that HCCI combustion is triggered by auto-ignition of the mixture during compression, there is no direct method of controlling combustion timing to ensure maximum efficiency. Therefore, the goal of this paper is to develop a control strategy for ignition timing of natural gas HCCI engines at steady-state conditions. To model the engine, a controls-oriented model is developed based on the modified knock integral model and is validated using a model developed by GT-power. Furthermore, a linear quadratic regulator is designed to control the engine timing. Simulation results show that the control system can track engine timing within 0.5% of its target value.

Original languageEnglish
Pages (from-to)205-234
Number of pages30
JournalInternational Journal of Vehicle Performance
Issue number2
Publication statusPublished - 1 Jan 2013



  • Control model
  • Homogeneous charge compression ignition engine
  • Linear quadratic regulator
  • LQR
  • Natural gas

ASJC Scopus subject areas

  • Mechanics of Materials
  • Automotive Engineering
  • Computer Science Applications
  • Modelling and Simulation
  • Fuel Technology
  • Safety, Risk, Reliability and Quality
  • Mechanical Engineering

Cite this