Capacitive pulse pickup
Shielded differentiator for automotive ignition applications
Ignition and combustion engine performance monitor
Spark plug testing under dynamic load Patent #: 4825167
ApplicationNo. 509888 filed on 04/16/1990
US Classes:324/402, Apparatus for coupling a measuring instrument to an ignition system73/117.3, With continuous operation324/384, Using plural tests in a conventional ignition system324/395, Using an illuminating device to indicate spark plug condition324/399Wherein a measured electric quantity indicates spark plug condition
ExaminersPrimary: Eisenzopf, Reinhard J.
Assistant: Mueller, Robert W.
International ClassF02D 017/00
AbstractA self-contained handheld peak ignition breakdown voltage probe locates faulty sparkplugs in an internal combustion engine. The probe has a novel dual-polarity detection system suitable for all ignition systems, distributorless or distributor types. Each nanosecond peak breakdown ignition event is signalled by a high-intensity LED lamp lit for a fixed period of time. An adjustable calibrated threshold level provides precise control of acceptance level. Other problems such as cabling, plug gap, and relative compression may also be inferred. The simple arrangement of integrated circuits provides a novel and useful tool for locating ignition problems.
Field of SearchIn situ testing of spark plug
Using an illuminating device to indicate spark plug condition
With an air gap in series with spark plug to indicate spark plug condition
Wherein a measured electric quantity indicates spark plug condition
Apparatus for coupling a measuring instrument to an ignition system
Using capacitive type measurement
With a capacitive sensing means
Including a probe type structure
By spark or arc discharge
With continuous operation
MOTOR AND ENGINE TESTING