Delphi Technologies, Inc.

Robert A Noel

Ronald J Kiess

James Alva Boyer

Diane E Hageman

James Tordt Wright

Matthew W Bell

Dean M Ford

An ignition coil, spark plug, and pressure sensor for an internal combustion engine are, in a preferred embodiment, integrated into a single assembly and mounted directly on a plug hole of an internal combustion engine. A hard spark plug shell serves as a pressure member and on which a strain gage is affixed. Changes in the pressure in the combustion chamber deform the shell, causing a corresponding change in the resistance of the strain gage. A bridge circuit or the like is used to measure the resistance change thereby providing a direct indication of cylinder pressure.

Spark generating apparatus having strain gage cylinder pressure measurement feature

Spark apparatus with pressure signal response amplification

An apparatus for detecting a pre-ignition combustion condition in an internal combustion engine. An ion sensing circuit measures an ion current during the ignition coil charging time. An ion current level above a predetermined reference level indicates pre-ignition combustion. A powertrain control module is responsive to a pre-ignition signal for discontinuing delivery of fuel to the cylinder in which the ion current was measured.

Pre-ignition detector

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Anderson, IN, United States of America

Robert A Noel