G3400 Engines (EIS) Caterpillar

System Overview

Usage:

Introduction

Electronic Ignition System (EIS)

The Caterpillar EIS provides variable ignition timing that is sensitive to detonation. The EIS consists of the following components:

EIS control module
Ignition transformers
Speed/Timing sensor
Manifold air pressure sensor (MAP)
Detonation sensors

Each cylinder has an ignition transformer that is located under the valve cover for the cylinder. To initiate combustion, the control module sends a pulse of approximately 190 volts to the primary coil of each ignition transformer at the appropriate time and for the appropriate duration. The transformers step up the voltage in order to create a spark across the spark plug electrode.

Detonation sensors monitor the engine for excessive detonation. The engine has two detonation sensors. Each sensor monitors one cylinder bank. The sensors generate data on vibration that is processed by the control module in order to determine detonation levels. If detonation reaches an unacceptable level, the control module retards the ignition timing of the affected cylinders. If retarding the timing does not limit detonation to an acceptable level, the control module shuts down the engine.

The ignition is enabled via an input on the control module. The input is activated by a control system that is provided by Caterpillar or by the customer.

The control module provides extensive diagnostics for the ignition system. The control module also contains an input for ignition timing in order to allow operation with alternate fuels such as propane that require a timing offset.

Optional Electronic Systems

Optional electronic systems provide additional capabilities and features. The systems that may be installed depend on the application.

Status Control Module (SCM)
Other systems that are provided by Caterpillar or by the customer

Status Control Module (SCM)

The SCM includes the following features:

Control of starting the engine and stopping the engine
Basic engine protection
A display of the status of certain parameters
Shutdown indicators
Diagnostic information

When the SCM receives a signal to start the engine, the SCM activates the fuel system and the starting motor. The SCM also sends a command to the EIS control module in order to begin the ignition. When the engine rpm reaches the crank termination speed, the starting motor is disengaged.

The SCM will sequentially display the following parameters in two second increments: service hours, engine rpm, battery voltage, engine oil pressure and engine oil temperature. The SCM also monitors the engine for faults.

The SCM protects the engine from certain faults. For example, the SCM will shut down the engine if the oil temperature is above the setpoint.

The SCM displays certain operating parameters. For example, the temperature of the oil can be displayed on the module's indicator.

The SCM also has light emitting diodes that indicate an engine shutdown.

The engine will operate until the SCM receives a shutdown signal. The shutdown signal can come from a switch or from the EIS control module. When the SCM shuts off the fuel supply, the SCM also sends a command to the EIS control module in order to terminate the ignition.

Engine Monitoring and Protection

The engine may be equipped with a system that provides additional features. The system that is installed depends on the application. The system may communicate with the EIS and the air/fuel ratio control via the Cat data link. The system may provide some of the following features or all of the following features: