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US 5,218,302 AGranted
Interface for coupling an analyzer to a distributorless ignition system
AssigneeSun Electric Corporation
InventorsThomas D. Loewe, David M. Oles
Life of this patent
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AssigneeSun Electric Corporation
InventorsThomas D. Loewe, David M. Oles
Estimating the term…
An interface for coupling an engine analyzer to an engine having a distributorless ignition system includes a pair of pickup clamps for coupling signals from respective groups of spark plug wires. A logic cell array is supplied with spark plug secondary voltage polarity and pattern information, corresponding to an engine under test from a ROM. The technician is instructed as to which wires to place in each clamp. A semiconductor input switch is controlled by the logic cell array to sort the secondary voltages from the pickup clamps according to polarity. The real and the wasted sparks are then determined based upon the magnitude of the signals from the input switch. The apparatus permits a "rapid test" (of secondary voltages only) by developing a pseudo primary clock from the pickup clamp signals. A CPU in the interface is controllable by an external computer or by an operator keypad. A vehicle "personality" module interfaces the logic cell array with the voltage levels on a connector of a corresponding vehicle.
An interface for coupling secondary signals corresponding to pairs of spark plugs in a distributorless ignition system wherein each pair of spark plugs is simultaneously fired with opposite polarity voltages from a respective common ignition coil comprising:
An interface arrangement for coupling secondary voltages corresponding to spark plugs in a distributorless ignition system wherein pair of spark plugs is simultaneously fired with opposite polarity secondary voltages by a common ignition coil comprising:
Dependencies are inferred from the claim text.