Development of Free Religious Automotive I C Engines P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Controlled Combustion in CI & SI engines…..

Diagnostic Testing of HCCI-DI Engine

In-cylinder Processes in a Harsh HCCI-DI Engine

In-cylinder Processes in a Pure HCCI-DI Engine

Effect of Split Ratio on Range of Equivalence Ratio in CI Engines 7.0 Rich Mixture Zone 5.0  3.0 1.0 Lean Mixture Zone

Effect of Split Ratio 80 % (Harsh) HCCI DI Engine Cylinder Process

Fuel Economy of Homogenization

Eco-friendly Behaviour of Homogenization Smoke Opacity is the fraction (or %) of incident light which is adsorbed or scattered by the particulate matter in exhaust gas.

Control of Particulates in 80 % (Harsh) HCCI DI Engine - 1

Control of Particulates in 80 % (Harsh) HCCI DI Engine - 2

Effect of Degree of Homogenization : Particulates

Effect of Degree of Homogenization : HC Emissions

Effect of Degree of Homogenization : CO Emissions

Effect of Degree of Homogenization : NOx Emissions

Schematic Diagram of HCCI-DI Engine test setup with EGR & Fuel Heating

Effect of Exhaust Gas recirculation

Role of Fuel Heating

High Speed Operation of HCCI-DI Engine

Special Parameters for Combustion Characterization Identification of Different Combustion Parameters

Evolution of CI Engine from Polite to Aggressive Attitude

Belligerent Nature of HCCI Engine

Evolution of Onset of Combustion

Selection of Pilot Injection Timing

Selection of PIT : For Safe Combustion

Selection of PIT : For Safe Combustion

HCCI-DI Engine is a Consciously Knocking Engine The slope of RI for pure HCCI (100% premixed) combustion will be much steeper than 80% and 95% split ratio.

HCCI-DI is a Consciously Knocking Engine Corresponding RI was 2.94 W/m2 and 13.5 W/m2. Only 0.7 bar IMEP increase leads to 4 times increase in RI !!! This RI (13.5 W/m2) is about 8 times higher to the baseline combustion at similar load condition. The slope of RI for pure HCCI combustion will be much steeper than 80% and 95% split ratio.

Final Recommendations COV of IMEP beyond 4 bar IMEP condition is found within 5%. COV for baseline combustion remains around 3% irrespective of load.

Conclusions HCCI Engine Technology is an obvious future choice. Extensive CAD is essential for the development of HCCI Engines. CAD combined with experimental study will develop a better engine with faster development cycle. More avenues for future research and development.