Electricity: measuring and testing – Internal-combustion engine ignition system or device – Ignition timing
Patent
1991-06-28
1994-02-01
Strecker, Gerard R.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Ignition timing
324388, 324546, 324379, 123643, F02P 1700, G01R 3106
Patent
active
052835278
ABSTRACT:
Methods and apparatus for detecting low impedance short circuits in a secondary winding circuit of a coil of a distributorless ignition system (DIS) by analyzing spark discharge signals on a primary winding of the ignition coil. In one embodiment, the duration times of the spark discharge signals are compared to a threshold spark duration time, with a low impedance short circuit being indicated if the threshold spark duration time is exceeded. In another embodiment, two or more spark dwell signals are applied to the primary of the ignition coil for each spark event of each associated pair of engine cylinders. A first or base time period is determined for the first dwell signal by measuring the time it takes the first dwell signal to produce a preselected current flow in the primary winding. A second time period is then determined by measuring the time it takes the second dwell signal to produce the same preselected current flow in the primary winding. The second time period is then compared to the first time period to determine whether a short circuit exists in the secondary winding circuit. A guard-band time period is subtracted from the first time period to define a minimum duration time for the second time period. If the second time period is equal to or exceeds the minimum duration time, a normal secondary winding circuit is indicated. If the second time period is less than the minimum duration time, a short circuited secondary winding circuit is indicated.
REFERENCES:
patent: 3961240 (1976-06-01), Pohl
patent: 4053823 (1977-10-01), Adamian
patent: 4379263 (1983-04-01), Everett et al.
patent: 4408583 (1983-10-01), Merrick
patent: 4459544 (1984-07-01), Makita
patent: 4508092 (1985-04-01), Kiess et al.
patent: 4684896 (1987-08-01), Weishaupt
patent: 4750467 (1988-06-01), Neuhalfen
patent: 4760341 (1988-07-01), Skerritt
patent: 4773380 (1988-09-01), Narita et al.
patent: 4886029 (1989-12-01), Lill et al.
patent: 4913123 (1990-04-01), DeBiasi et al.
patent: 4915086 (1990-04-01), Ciliberto et al.
patent: 4918389 (1990-04-01), Schleupen et al.
patent: 4969443 (1990-11-01), DeBiasi
Abolins Peter
Do Diep
Ford Motor Company
May Roger L.
Strecker Gerard R.
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