Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2005-07-26
2005-07-26
Cuneo, Namand (Department: 2829)
Measuring and testing
Simulating operating condition
Marine
C073S118040
Reexamination Certificate
active
06920783
ABSTRACT:
An automotive ignition diagnostic system includes an ion current detection circuit producing a buffered representation of an ion current flowing across an electrode gap of an ignition plug in response to a bias voltage applied thereto. An ignition diagnostic circuit is responsive to the buffered representation of the ion current to charge a single integration capacitor. The diagnostic circuit is operable to produce an output signal having a pulse width defined by the amount of charge on the capacitor. When the ion current flows following a combustion event, the width of the output signal is controlled as a function of the quality of combustion in the corresponding cylinder. However, if sufficient ion current flows prior to combustion, the width of the output signal is controlled to indicate a fouled ignition plug.
REFERENCES:
patent: 6032650 (2000-03-01), Rask
patent: 6263727 (2001-07-01), Butler, Jr.
patent: 6453733 (2002-09-01), Malaczynski et al.
patent: 6560526 (2003-05-01), Matekunas et al.
U.S. Appl. No. 09/527,889, filed Mar. 20, 2001.
Chmielewski Stefan V.
Cuneo Namand
Delphi Technologies Inc.
Harrison Monica D.
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