Abstract
Different intake valve timings and fuel injection amount were tested in order to identify their effects on exhaust emissions and combustion characteristics using variable valve actuation (VVA) in a Homogeneous Charge Compression Ignition (HCCI) engine. HCCI engine is a promising concept for future automobile engines and stationary power plants. Two-stage ignition process in a HCCI engine creates advanced ignition and stratified combustion, this makes ignition timing and combustion rate controllable. Meanwhile, the periphery of fuel-rich zone leads to fierce burning, which results in slightly high NOx emissions. The experiments were conducted in a modified single cylinder water-cooled diesel engine. In this experiment we use diesel, bio-diesel (Jatropha) and gasoline as the fuel at different mixing ratios. HCCI has advantages in high thermal efficiency and low emissions and possibly become a promising combustion method in internal combustion engines.
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