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5d - Ignition System2

This document provides an overview of the ignition system for Cummins QSK 60G gas engines. It discusses the main ignition system components, which include spark plugs, coil-on-plug assemblies, an ignition module, and CM558 control modules. The ignition system uses these components to provide fully electronic and precise spark timing and energy control that varies based on engine load. The coil-on-plug design improves reliability and life compared to traditional inductive ignition systems.

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185 views9 pages

5d - Ignition System2

This document provides an overview of the ignition system for Cummins QSK 60G gas engines. It discusses the main ignition system components, which include spark plugs, coil-on-plug assemblies, an ignition module, and CM558 control modules. The ignition system uses these components to provide fully electronic and precise spark timing and energy control that varies based on engine load. The coil-on-plug design improves reliability and life compared to traditional inductive ignition systems.

Uploaded by

agvass
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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QSK 60G & 60G High Efficiency Series

Gas Engines

Module 5 – IGNITION SYSTEMS

Cummins Corporate Training


1
HE -60G/ Ignition / BMG / 03 - 07 / REV 01.
System Module - Ignition

Learning Objective
To give an introduction to the Ignition System. At the end of this
section of the module you will know the main Ignition System
Components and understand the operation of the Ignition System.

Agenda
• Ignition System Components:
- Spark Plug,
- Coil-on-Plug,
- Ignition Module (CCD / PDM Module),
- CM558 Modules.

2
Ignition Components

The following components are provided on each engine:

ƒSpark plug - one per cylinder


ƒ COP (Coil on Plug)
ƒ Ignition Module (Capacitor Discharge Type)
ƒ CM 558 (Control Module 558) .

THE ABOVE MODULES ARE ONLY PART OF THE COMPLETE CONTROL


SYSTEM . MODULES ARE SUPPLIED WITH INFORMATION BY A NUMBER OF
SENSORS / SENDERS MOUNTED ON THE ENGINE. THE SENSORS AND
MODULE FUNCTIONS WILL BE COVERED IN THE CONTROL MODULE.

3
Cummins QSK Gas Ignition System
ƒ Fully Electronic Design to ensure precise timing and spark control.
ƒ Has closed-loop Control capability - multi-strike capability based on
breakdown voltage of COP previous cycle, 6 maximum. (Not used in
Power Generation applications).
ƒ Variable Energy System.
ƒ Monitors In-Cylinder Pressure (by spark resistance).
ƒ Varies Spark Energy based on In-Cylinder Pressure.

- At Low loads, Cylinder boost pressure lower, LESS spark energy required
- 12/18KV to start fuel burn.
- At High loads, Cylinder boost pressure higher, MORE spark energy
required - 26KV to start fuel burn.
Traditional Inductive Ignition Systems must address high load environment.
Therefore always fire the plug at max energy levels.
Result: Improved Spark Plug Life !
4
Ignition Components

IGNITION
COP A SSM558 B
CCD / PDM
Assembly
Module

Spark Ignition Harness


Plug

5
Control & Ignition Modules

ƒ Ignition Module - one per bank,


ignition control, 9 cyl max. output
300 - 350v
ƒ CM 558 - one per bank, ignition
& throttle control
CM 558 IGN.
Module Module
View on Face of SSM 558

SSM558
1
A 10 1
B 10 10
B 1 10
A 1

41 50 41 50 50 41 50 41
Front View - Male Connectors Face View of Connectors (When Removed) - Female
Male Pin Connectors Pin Connectors
6
Coil-On-Plug

ƒ One COP per cylinder.

ƒEliminates high-tension leads. Coils designed for 40,000 hr + life


ƒ
ƒOutput range 12,000 to 36,000 v.

ƒ Improves ignition system


reliability and output.

ƒ Liquid Polymer insulation / Ignition Harness

cooled construction.

7
‘V’ Engine - SEM COP Assembly

Easily identified by its


integral harness and 3-
pin Deutsch Connector.
Removable HT
Insulator Section

Coil Housing

A - (–) Vdc.
A B - (+) Vdc - 330v to
Primary Winding.
C B
C - Not Used.

ƒRemovable injection molded Insulator section with rubber boot. (Cummins Pt No. 4917686).
IMPORTANT! The coil has a liquid polymer insulation. Do NOT energise the coil in a horizontal position
as it is possible to get an internal flash-over between the LV and HV circuits.
8
QSK 60G & 60G High Efficiency Series
Gas Engines

Module 5 – IGNITION SYSTEM

End
Cummins Corporate Training
9
HE -60G/ Ignition / BMG / 03 - 07 / REV 01.

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