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This paper describes a system for knock detection in automobile engine using the spark plug as a detecting probe. The authors carried out researches on a method which used ionic current of spark plug analysis for monitoring the combustion in an internal combustion engine. By this method, the spark plug was used as an ion density measurement probe directly, the flame behavior at the initial combustion stage was positively detected. The operations base on detection the ionic current which occurs when hydrocarbon is burned, by applying the DC bias voltage across the spark plug gap, thus the monitoring can be done in real time by processing Digital oscilloscope and the ionic current can be achieved.
The results of experiment on four-cylinders engine could be included in this paper. By making use of the spark plug gap as an ion density measurement sensor, the authors analyze many factors for detecting ionic current (voltage), such as the polarity of bias voltage in a spark plug. the bias effect, the bias voltage, the ignition bum time and high voltage diode. The method can be effectively used for continuous monitoring of other factors in the internal combustion engine.

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ABSTRACT

INTRODUCTION

BASIC PRINCIPLES OF SPARK PLUG VOLTAGE ANALYSIS METHOD

TEST RESULTS

CONCLUSION

ACKNOWLEDGMENT

REFERENCES

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UCI(KEPA) : I410-ECN-0101-2009-556-014115588