为了降低汽车废气对大气的污染,更好地开发与使用污染较少、经济便宜的汽车代用燃料,提出了一种基于稀薄燃烧的压缩天然气(CNG)涡轮增压发动机控制方法;该方法采用中冷涡轮增压,提高了燃气发动机的输出扭矩与功率;又采用基于λ型氧传感器和转矩预估的稀薄燃烧控制策略,燃料消耗量明显降低;用这种控制方法改进中冷增压机型的4D125柴油机,抑制改造后增压发动机高转速时过大扭矩,匹配出CNG燃料发动机;实验证明,这种控制方法实现了涡轮增压燃气发动机的理想外特性,具有较高的可靠性和实用性.%A compressed natural gas (CNG) turbocharged engine controlling method based on lean burn is presented. This method uses intercooled turbocharged to improve the output torque and power of gas engine. Fuel consumption is significantly decreased by lean burn control using λ oxygen sensor and torque estimation algorithm. With this method, the 4D125 diesel engine with intercooled turbocharged is modified to reduce the excessive torque at high speed and meet the requirements of CNG gas engine. Results show that this modified engine achieves the ideal external characteristics of turbocharged gas engine. This method has high reliability and practicality.
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