Automotive and Combustion Engine Technology — Winter 2017

What is Engine downsizing? Write down any two methods for engine downsizing.

Enlist strategy for emission control in gasoline and diesel fueled vehicle.

Explain working of Direct Injection Gasoline Engine with schematic diagram.

Enlist various after treatment technologies for diesel and gasoline vehicle.

What is stratified charge operation in case of gasoline direct injection?

Explain different types of direct injection gasoline injectors.

Explain salient feature of spray guided combustion system for gasoline direct injection.

What is turbocharging? What is the advantage of turbocharging in SI engine?

Describe Thermal loading and Turbo lag in context of gasoline engine with turbo charging.

Explain the reasons for knocking and abnormal combustion with turbocharging in SI engine? Enlist the methods to reduce knock and abnormal combustion of an SI engine with turbocharging.

Enlist the possible measures for NOx reduction in diesel and petrol vehicles.

What is the effect of turbocharging on SI engine emission?

Explain the advantages of combining direct injection and turbocharging in SI engine.

What is auto ignition phenomenon? What is the basic difference between auto ignition combustion and SI combustion?

Enlist the problems associated with stratified charge lean-burn mixture in a DI gasoline engine.

Explain thermal management approach to achieving auto ignition combustion in gasoline engine.

What is internal exhaust gas recirculation system and external exhaust gas recirculation system?

Which are the modifications required to change from SI combustion to auto ignition combustion?

Explain the effect of fuel injection timing on auto ignition combustion.1

Enlist the controlling parameters for HCCI combustion for best fuel economy and low emissions in SI engine.

Explain basic principle of HCCI combustion.

Explain stages of combustion of HCCI engine.

Which are the primary objectives of gasoline HCCI engine and Diesel HCCI engine?

Enlist the limitation of HCCI combustion.

Differentiate homogenous combustion and diffusion combustion based on any seven aspects.