Ignition Issues and Their Impact on Engine Performance, Efficiency and Emission

Improved understanding and control of ignition and thereby combustion are critical in dealing with the problems of pollutants formation, engine performance, and fuel economy. This seminar will provide you with basic knowledge and recent advances in combustion-initiation (ignition) issues to more intelligently evaluate and harness their potentials. Thermodynamic and fluid mechanical properties of the unburned charge near the spark plug and at the time of ignition strongly affect the quality of the combustion and therefore the emission of the pollutants from the engine. Furthermore, a weak ignition limits engine performance and drivability. The so-called cyclic variability, which affects and bounds the lean and knock limits of an engine design is to a great degree influenced by the ignition system. Equally important, the ignition system can and is being used to provide local in-cylinder information on air-fuel ratio, misfire, knock, and mass fraction burned in each individual cylinder. Hence, great potential exists for applications of this information for individual cylinder control strategy to attain a more fuel efficient and environmentally compatible engine.

What Will You Learn

By attending this seminar, you will be able to:
  • Describe the important processes in ignition and its relation to engine performance, efficiency, and emission
  • Explain the combustion process in internal combustion engines
  • Apply ignition strategies for reduction of engine pollutants
  • Recognize the effects of ignition system design and engine operating conditions on combustion and emission
  • Describe the technology and the logic behind the current and future ignition-based engine diagnostics
  • Assist in the design of critical components such as combustion chambers and exhaust systems
  • Identify key design components of an ignition system for optimum combustion chamber design and low engine emission of pollutants

Is This Course For You

This seminar will be especially valuable for engineers, technical and project managers, researchers, and academicians involved in ignition and combustion/emission aspects of the combustion engines. Currently, the design strategy of many components in these engines is affected by combustion and emission control measures to meet customer's, federal and local government's demands and regulations. Therefore, engineers working on the design of components for high efficiency and performance of combustion engines as well as those directly and indirectly involved in ignition and emission reduction strategies will highly benefit from this seminar.

Materials Provided

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Course Requirements

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  • A Concise Background on Combustion in Spark Ignited (SI) Engines
    • Cylinder pressure traces
    • MBT and ignition timing
    • Flame propagation issues
    • Combustion characterization
    • Cyclic variability
  • Ignition Fundamentals
  • Spark Ignition
    • Function of ignition system
    • Commonly used ignition systems
    • What determines the amount of ignition energy
  • Four Phases of Spark Ignition
    • Pre-breakdown, breakdown, arc, and glow discharge
  • Effects of Some Key Parameters on Combustion, Emission and Performance
    • Higher power and/or energy
    • Longer duration discharge
    • Multiple spark plugs
    • Different spark plug designs
  • Alternative Ignition Methods
    • Corona ignition system
    • Plasma-jet ignition system
    • Flame-jet ignition system
    • Activated radical (AR) ignition
    • Others
  • Diagnostic and Control Opportunities
    • Use of spark voltage for monitoring combustion
    • Spark spectroscopy
    • Ionization measurement for engine health monitoring & diagnostics
  • Ignition Systems for Highly Diluted Mixtures
  • Conclusions