Ignition coil test apparatus

Details Ignition coil test apparatus Ignition coil test apparatus

1981-12-04

1984-12-25

Gruber, Felix D.

Boots, shoes, and leggings

731173, 324388, 324402, G01M 1500, G06F 1520, G01R 2902

Patent

active

044907990

ABSTRACT:
An ignition analyzer apparatus tests the condition of the ignition coil of an internal combustion engine. A gating pulse is supplied to a test circuit immediately before the points are to open for a selected cylinder which causes the test circuit to provide a low resistance in parallel with the points when the points open. This allows a reduced primary current to flow through the ignition coil and prevents the production of a voltage pulse large enough to fire the spark plug for the selected cylinder. While the points are open and the test circuit is providing a low resistance path, the primary current flowing through the coil is measured. The gating pulse ends approximately half-way between the "points open" time of the selected cylinder and the "points open" time of the next cylinder so that the rotor of the distributor is between distributor terminals. When the gating pulse ends, the test circuit changes to a nonconductive state, and since the points have not yet closed, the primary current is interrupted and a high voltage secondary test signal is induced in the secondary of the ignition coil. This test signal cannot, however, fire a spark plug since the rotor is in between distributor terminals, and since the reduced amplitude of the primary current prevents arc-over from the rotor to the distributor terminals. The measured primary current and the measured high voltage secondary test signal are used to provide an indication of ignition coil condition.

REFERENCES:
patent: 3572103 (1971-03-01), Marino
patent: 3573608 (1971-04-01), Marino et al.
patent: 3630076 (1971-12-01), Staudt
patent: 3788129 (1974-01-01), Trussell
patent: 3940977 (1976-03-01), Voross et al.
patent: 4008434 (1977-02-01), Schaefer
patent: 4145746 (1979-03-01), Trussell et al.
patent: 4291383 (1981-09-01), Tedeschi et al.

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