With an improved 1.5 VCT engine as the test platform, the influence of combusting methanol-gasoline flexible fuel on the engine exhaust noise was investigated. The result of full speed load character test shows that the exhaust noise of the engine at middle and high speed for using methanol-gasoline fuel is higher than that for using gasoline. The difference of the engine exhaust noise between them can reach the maximum value of 4.0 dB (A) at 6 000 r/min speed. The result of load character test at 4 500 r/min speed shows that the exhaust noise for using methanol-gasoline fuel will increase when the load reaches 32%of the maximum load of M0.%以一款经过改造后的1.5 VCT发动机为试验研究平台,研究燃用甲醇汽油灵活燃料对排气噪声特性的影响.外特性试验结果表明甲醇汽油在中、高转速时使排气噪声增大,其中6 000 r/min时最大增加4.0 dB(A);负荷特性(4 500 r/min)试验表明负荷达到M0最大负荷的32%以上时排气噪声也会增大.
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