降低电控喷射汽油机燃油消耗率及NO_x排放的研究

Study on Improving Fuel Economy and Lowering Emissions of Stoichiometric Gasoline Engine

在一台单缸电控燃油喷射汽油机上 ,采用排气再循环 (EGR)及提高压缩比的方法来改善汽油机在化学计量比下运行时的经济性 ,降低其NOx、(NOx+HC)的排放 .结果表明 ,当压缩比ε提高到 10、并优化进气涡流比和排气再循环率后 ,汽油机的平均比油耗下降了 2 5 4 % ,NOx 的平均排放体积分数下降了 5 4 8% ,(NOx+HC)的平均排放体积分数下降了 4 3 2 4 % .放热规律的计算表明 。

The experiment results are Presented which are obtained from the tests of an electronic controlled fuel injection stoichiometric gasoline engine by using cold exhaust gas recirculation (EGR) and higher compression ratio to improve fuel economy and reduce emissions. After the compression ratio of the engine is raised from 8 to 10 and EGR rate, air swirl ratio is optimized, the fuel economy is improved by 2.54% and the nitrogen oxide and (nitrogen oxide and hydrogen carbide) emissions are decreased by 54 84% and 43 24% respectively at full load speed characteristics. The calculation results of heat release rates according to the measured indicator diagram show that the combustion process is remarkably improved.