压气机性能变化对发动机瞬态性能的影响

Effects of Compressor Performance Change on Engine Transient Performance

基于某1.5 L涡轮增压汽油机,研究了压气机特性参数对发动机低速低负荷瞬态性能的影响。在GT-Power中建立稳态仿真模型并验证,进而构建瞬态仿真模型。采用定转速增转矩的方式进行发动机瞬态性能研究,并建立三种瞬态响应指标用于分析。通过改变压气机特性参数中高效率区在高低压比、大小流量范围内的分布并分析瞬态性能评价指标,可知高效率区处在高压比范围时瞬态性能得到优化;当在该范围内改变比例为20%时,瞬态响应变快68%。研究结果表明,压气机高效率区在高低压比、大小流量范围内的不同分布有助于改善发动机瞬态性能。

Based on a 1.5L turbocharged gasoline engine,the effects of compressor characteristic parameters on engine transient performance at low speed and low load was studied.A steady-state simulation model was established and verified in GT-Power and then a transient simulation model was constructed.The engine transient performance was studied using a constant speed and increase of torque method and three transient response indicators were established for analysis.By changing the distribution of compressor high-efficiency zone in the high-low pressure ratio range and large-small flow range and analyzing the transient performance evaluation index,the transient performance was optimized when the high-efficiency zone lied in the high-pressure ratio range.The transient response accelerated by 68% when the ratio changed as 20% within this range.The results show that different distributions of compressor high-efficiency zone in the high-low pressure ratio range and large-small flow range can improve the transient performance of engine.