Unit 1

Spark Ignition engines: Mixture requirement-Fuel injection systems. Stochiometric combustion-combustion with excess air-equivalence ratio Stages of combustion: Normal and Abnormal combustion-Knock. Combustion chambers.Simple thermodynamic analysis of SI engine combustion. (13 hours)

Unit 2

Compression ignition engines: Nature of combustion in IC engines-Direct and Indirect injection systems- Air motion- Combustion Chambers-Spray penetration and evaporation. Supercharging – Turbo charging. Thermodynamic analysis of CI engine combustion. WankelEngine: Operation & applications. Hybrid engines. Thermo chemistry: Pollutant formation, Instrumentation to measure pollutants-Pollutant calculation-Effect of air- fuel ratio.

Unit 3

Emission standards: EGR on engine emissions-Emission standards-Emission control devices. Thermal & catalytic exhaust clean-up-catalysts-automotive catalytic converters-Engine modifications to reduce emissions. Heat release analysis of IC engines.
Alternate Fuels: Engine modifications for alternate fuels (liquid and gaseous fuels), homogenous charge compression ignition engines.Additives for enhancing performance and pollution control.

Course Objectives

• To familiarize mixture requirement for SI and CI for complete combustion using thermodynamic analysis
• To familiarize normal and abnormal combustion from pressure data and interpret its effect on engine performance.
• To introduce the effect of boosting devices on engine performance, emission, heterogeneous combustion and spray behaviour
• To appraise the need for alternate fuels and methods to reduce emissions

Course Outcomes

• CO1: Analyze thermo-chemistry of combustion by applying thermodynamic laws in engine cycles
• CO2: Understand and analyse the operation of internal combustion engines
• CO3: Elucidate the effect of supercharging and turbo-charging on engine performance
• CO4: Understand various fuel-metering systems like CRDI, PFI, GDI diesel fuel injection system and latest technology in fuel injection systems in SI and CI engines
• CO5: Understand emission control techniques in engines, based on emission standards/norms and to recommend modification in engine for using alternate fuels

CO – PO Mapping

Textbook(s)

• Heywood, J. B., ‘Internal Combustion Engine Fundamentals’, McGraw-Hill, First Indian edition, 2017. BS VI emission norms (ARAI)

Reference(s)

• Ferguson, C.R, ‘Internal Combustion Engines’, John Wiley, 1989.
• Degobert, P., ‘Automobiles and Air Pollution’, SAE, 2002
• B.P.Pundir, ‘IC Engines Combustion and Emissions’,Narosa Publishing House, 2010

Evaluation Pattern