방전전압 측정에 의한 점화플러그의 간극 추정

초록

This article describes an estimate method of the spark plug gap by measuring breakdown voltage. Breakdown voltage is the function of spark plug gap, pressure, temperature and humidity. However, it is dominated mainly by the spark plug gap. This technique is applied to in-line process test of the spark plug gap in automobile engine production. Breakdown voltage of normal spark plugs slightly scatters in ordinary conditions and if there is dust or burr in the gap, breakdown voltage gets lower. This technique saves repairing time for bad spark plug and attributes to improve the quality of automobile engine.