Apparatus for measuring spark plug gap spacing

Details Apparatus for measuring spark plug gap spacing Apparatus for measuring spark plug gap spacing

1975-03-24

1977-05-17

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 1342

Patent

active

040244695

ABSTRACT:
This invention relates to testing spark plugs and, more particularly to measuring the gap spacing. An improved measuring apparatus is described that uses an AC high voltage applied across the spark plug electrodes and measures the time between a zero crossing of the AC high voltage and the plug firing. This measurement is averaged over several firings for a plug. Provision is made to burn off any debris in the plug gap before measurement begins. It has been discovered that an improved measurement output results from measuring only when positive half-cycles of the AC high voltage are applied to the plug center electrode with respect to the base electrode. The measurement output is linearized to obtain a linear output over a wide gap spacing. When a fault current is sensed, the measurement operation is stopped.

REFERENCES:
patent: 2430069 (1947-11-01), Mesh
patent: 3551800 (1970-12-01), Widmer
patent: 3572103 (1971-03-01), Marino
patent: 3603872 (1971-09-01), Pelta
patent: 3630076 (1971-12-01), Staudt
patent: 3740642 (1973-06-01), Taylor
patent: 3768004 (1973-10-01), Abnett
patent: 3771047 (1973-11-01), Spengler et al.

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