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 Knock Detecting – Combustion Sensing Ignition System 
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1744
Delphi Ionization Current Sensing Ignition Subsystem | © Delphi. All rights reserved. | 1


Delphi's Ionization Current Sensing Ignition Subsystem (Ion
Sense) is a technology based on the principle that electrical
current flow in an ionized gas (e.g. during combustion) is
proportional to the flame electrical conductivity. By placing a
direct current bias on the spark plug electrodes, the conductivity
can be measured.

Delphi's Ion Sense Subsystem consists of one ignition coil per
cylinder and high-temperature-resistant electronics. Moving parts
and high-voltage leads are eliminated to help provide maximum
energy supply to the spark plug. In this design, the spark plug
not only ignites the air/fuel mixture but also acts as an in-cylinder
sensor to monitor the combustion process. The resulting Ion
Sense signal contains combustion information. Processing of the
signal allows it to be used for engine control features that require
knowledge of combustion characteristics.

Features of previously produced Delphi Ion Sense Subsystems
have included coil per plug ignition, all speeds and loadscompliant
second generation on-board diagnostics (OBD-II)
misfire detection, and direct in-cylinder knock detection. Delphi's
Ion Sense technology has also been used in motorcycle
applications for knock detection and control.

……read more…… ... bystem.pdf


Fri Mar 08, 2013 2:29 pm

Joined: Sat Feb 25, 2017 11:58 am
Posts: 10
Did anyone in the general aftermarket pick this up? Sounds very interesting.

knowledge is just a rumor until the body experiences it

Sat May 13, 2017 3:53 pm
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