Transient Characteristics of the Combustion and Emissions for the Engine Start/Stop Operation in HEV
The transient characteristics of combustion and emissions for the engine start/stop operation in hybrid electric vehicle (HEV) are investigated in this study. Hydrocarbon (HC) emission of the initial 2nd~9th cycles is deteriorated significantly for engine quick start with the original engine calibration. HC concentration increases monotonously with the rising of cranking speed, because low intake manifold absolute pressure (MAP) causes large residual gas dilution and poor combustion. The postcatalyst HC emission decreases firstly and increases again with the rising of cranking speed, and achieves lowest value with the cranking speed of 1000r/min for the engine employed in this study. Fuel cut-off shut down can avoids misfire for the last fuel injection, therefore, less HC emission is emitted during stop process compared with the ignition cut-off shut down. The fuel deposit during stop process seems impact engine restart enrichment, mostly at the initial 0.7s for this study which is dominated by the MAP transition characteristic and the time coefficient for fuel vaporization.
Hybrid Electric Vehicle Start/Stop Transient Emission Characteristics
Yu Shui Dong Guangyu Li Liguang
Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiaotong Univer School of Automotive Studies, Tongji University, Shanghai 201804, P. R. China
国际会议
长春
英文
371-377
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）