Interface for coupling an analyzer to a distributorless ignition

Details Interface for coupling an analyzer to a distributorless ignition Interface for coupling an analyzer to a distributorless ignition

1991-02-06

1993-06-08

Harvey, Jack B.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Electronic ignition system

324402, F02P 1700

Patent

active

052183025

ABSTRACT:
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.

REFERENCES:
patent: Re31656 (1984-09-01), Howes
patent: 4644284 (1987-02-01), Friedline et al.
patent: 4847563 (1989-07-01), Sniegowski et al.
patent: 5068613 (1991-11-01), Kreft et al.
patent: 5132625 (1992-07-01), Shaland

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