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针对车用柴油机运行在高原地区外特性恶化的难题,提出了一种变海拔环境下柴油机进气压力控制方法,该方法通过调节高压级增压器旁通阀流通系数来动态调节二级涡轮可调增压系统压比。在基于最佳空燃比和最大输出功率的柴油机进气压力动态控制仿真基础上,建立了高压级增压器旁通阀流量系数与转速及大气压力的匹配关系。仿真试验表明,该方法大幅度降低了大气压力变化对柴油机外特性的影响,动力性和燃油经济性得到了明显改善。
Aiming at the problem that the diesel engine running outside the plateau region deteriorates, a method to control the intake pressure of the diesel engine under the altitude environment is proposed. The method adjusts the bypass coefficient of the high pressure stage booster bypass valve to dynamically adjust the secondary turbine Adjust the pressure system pressure ratio. Based on the simulation of the dynamic control of intake air pressure of diesel engine based on the optimal air-fuel ratio and maximum output power, the matching relation between the flow coefficient of the high-pressure supercharger bypass valve and the speed and the atmospheric pressure is established. Simulation results show that this method significantly reduces the influence of atmospheric pressure on the diesel engine’s external characteristics, and significantly improves the power and fuel economy.