天然气发动机缸温闭环控制策略

徐凯峰

中国石油集团济柴动力有限公司，山东 济南  250306

摘要：针对空燃比闭环控制天然气发动机的氧传感器故障率高、发动机控制不稳定的问题，以某V型20缸天然气发动机为研究对象，设计一种不受氧传感器制约的新的缸温闭环控制策略。分析缸温控制结构，设计缸温闭环控制模型和控制策略，标定优化发动机控制参数，并进行发动机实际运行试验验证。试验结果表明：开启缸温闭环控制后，在点火提前角相同的条件下，发动机标定功率达到1 900 kW，各缸平均排温由630 ℃降低至623 ℃，功率为1 900 kW时的热效率由41.60%提高到42.15%，缸温闭环控制策略有效，提高了天然气发动机控制的稳定性，且整机性能有所提高。

关键词：天然气发动机；控制系统；缸温；闭环修正；标定

A closed-loop control strategy based on cylinder temperature of a natural gas engine

XU Kaifeng

CNPC Jichai Power Co., Ltd., Jinan 250306, China

Abstract: In response to the high failure rate of oxygen sensors and unstable engine control in natural gas engines with closed-loop control of air-fuel ratio, a new closed-loop control strategy based on cylinder temperature without the constraint of oxygen sensors is designed for a V-type 20 cylinders nature gas engine. The cylinder temperature control structure is analyzed, a closed-loop control model and control strategy based on cylinder temperature are designed, the engine control parameters are calibrated and verified by engine operation tests. The experimental results show that with the closed-loop control based on cylinder temperature, under the same ignition advance angle, the engine calibration power reaches 1 900 kW, the average exhaust temperature of each cylinder decreases from 630 ℃ to 623 ℃, and the thermal efficiency increases from 41.6% to 42.15% when the power is 1 900 kW. The closed-loop control strategy based on cylinder temperature is effective, which improves the stability of natural gas engine control and enhances overall performance.

Keywords: nature gas engine; control system; cylinder temperature; closed-loop correction; calibration