Search Results

Combustion of premixed lean mixture which arises from multi-point ignition is very promising and necessary for achieving both higher efficiency and lower nitrogen oxide (NOx) emission. A Premixed-Charge Compression Ignition (PCCI) engine has been manufactured experimentally and evaluated in terms of fuel economy and NOx reduction. The PCCI engine manufactured is a single cylinder engine with inlet port injection of gasoline, and has a compression ratio of 17.4. The PCCI engine operates stably in the air-fuel ratio range of 33-44. In the PCCI engine, spontaneous ignition occurs at unspecified points as it does in diesel engines. The flame then develops rapidly throughout the combustion chamber. Under conditions of stable combustion, the PCCI engine achieves equivalent fuel economy and much lower NOx emission compared with diesel engines. Furthermore, the effects of intake air heating and supercharging on extending the range of stable combustion have been examined.