对于一台高速涡轮增压发动机来说,由于燃烧过程的强化,其排气温度通常是较高的。一旦出现某些特殊情况(例如,空气滤堵塞了,或者喷油器漏油等),会使发动机过热,排温超过增压器涡轮所能承受的工作温度,结果造成发动机和涡轮增压器损坏。为了确保发动机能安全可靠地运转,必须研制一套自动控制的保护装置来限制发动机的排气温度。 For a high-speed turbocharged engine, the exhaust temperature is usually higher due to the enhanced combustion process. In the event of some special conditions (for example, the air filter blockage, or fuel injector leakage, etc.), the engine will overheat, the exhaust temperature exceeds the turbocharger turbine can withstand the operating temperature, resulting in the engine and turbocharger damage. In order to ensure that the engine can operate safely and reliably, an automatically controlled protection device must be developed to limit the exhaust temperature of the engine.