Apparatus for recognizing missing or poor firings in otto engine

Details Apparatus for recognizing missing or poor firings in otto engine Apparatus for recognizing missing or poor firings in otto engine

1990-06-29

1991-09-03

Wieder, Kenneth A.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324388, F02P 1700

Patent

active

050457969

ABSTRACT:
A circuit for recognizing missing or poor firings in Otto (gasoline) engines with multi-circuit ignition systems features a voltage tap on the primary side of each ignition coil (10, 11), leading to a respective controllable transistor (16, 19). A common junction point (21) for the respective transistors provides signals, representative of the control states of the transistors, for evaluation (32). These signals correspond to the respective spark burning voltages. The cylinders fire sequentially, so the voltage patterns of the respective cylinders appear sequentially at the common junction point, and it is possible, even in multi-circuit ignition systems, to monitor the individual ignition circuits in a simple manner, and to interrupt fuel supply to any less-than-optimally firing cylinder, thereby preventing unburnt hydrocarbon overload on the catalytic converter and on the environment. Preferably, the evaluation circuit includes an A/D converter (33) and an INTEL 8051 microprocessor (34).

REFERENCES:
patent: 2335780 (1943-11-01), McCoy
patent: 4401948 (1983-08-01), Miura et al.
patent: 4637247 (1987-01-01), Dreyer et al.
patent: 4742306 (1988-05-01), Everett et al.
patent: 4918389 (1990-04-01), Schleupen et al.

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