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1·The system is a semi-closed loop system that knock sensor was used.

由于采用外部的爆震传感器，整个系统成为一个半闭环系统；

2·The technology of engine electronic control and diagnosis, which is different from the control method by using O2 sensor and knock sensor, is studied as well.

提出了一种不同于目前应用的氧传感器和爆震传感器所进行的新型发动机电控技术和诊断技术。

3·The structure of the new designed sensor is very compact, the cost is relatively low and it is small to take up the space. Its signal does not need to amplify while measuring the signal of knock.

设计的新型爆震传感器结构非常紧凑，成本较低，占用空间小，在测量爆震信号时信号无需再放大即可使用。

4·The use of the spark plug sensor is proved to be feasible in knock combustion detection.

试验表明，火花塞光纤传感器完全可用于爆燃测量。