Patents Assigned to Murphy Power Ignition
  • Stroke distinction in 4-cycle engines without a cam reference
    Patent number: 6600322
    Abstract: Methods, apparatus, and systems for distinguishing between compression and exhaust strokes of a four-cycle engine is provided. A first ionization time of a spark plug for a known cylinder is measured on a first engine stoke. A second ionization time of the spark plug is measured on a second engine stroke. The second ionization time is compared to the first ionization time. It is determined that the engine stroke with the greater ionization time is a compression stroke.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: July 29, 2003
    Assignee: Murphy Power Ignition
    Inventor: Stephen H. Nussbaum