CONE 1513084 - Caterpillar

Illustration 1 g01054803
ECM
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(1) Primary ECM
(2) Secondary ECM The electronic control system is integrally designed into the engine's fuel system and the engine's air inlet and exhaust system in order to electronically control the fuel delivery and the injection timing. The electronic control system provides increased timing control and fuel air ratio control in comparison to conventional mechanical engines. Injection timing is achieved by precisely controlling the injector firing time. Engine rpm is controlled by adjusting the injection duration. The Electronic Control Module (ECM) energizes the unit injector solenoids in order to start the injection of fuel. Also, the ECM de-energizes the unit injector solenoids in order to stop the injection of fuel.The ECM has two 70 pin connectors.The flash file is used by the ECM to store all the rated information for a particular application. The flash file cannot be replaced physically. The flash file must be flash programmed with a PC.The engine uses the following three types of electronic components:
Input
Control
OutputAn input component sends an electrical signal to the ECM. The signal varies in one of the following ways:
Voltage
Frequency
Pulse widthThe variation of the signal is in response to a change in some specific part of the system. A specific example of an input component is the engine speed-timing sensor. The ECM interprets the signal from the input component as information about the condition, environment, or operation of the engine.A control component receives the input signals from the input components. Electronic circuits inside the control component evaluate the signals from the input components. These electronic circuits also supply electrical energy to the output components of the system. The electrical energy that is supplied to the output components is based on predetermined combinations of input signal values.An output component is operated by a control module. The output component receives electrical energy from the control group. The output component uses that electrical energy in one of two ways. The output component can use that electrical energy in order to perform work. The output component can use that electrical energy in order to provide information.As an example, a moving solenoid plunger will perform work. By performing work, the component has functioned in order to regulate the engine.As an example, an alarm will provide information to the operator of the engine.These electronic components provide the ability to electronically control the engine operation. Engines with electronic controls offer the following advantages:
Improvement in performance
Improvement in fuel consumption
Reduction in emissions levels