BOLT 2152590 - Caterpillar

The engine is designed for electronic control of most engine operating functions. The electronic system consists of the following components: Electronic Control Module (ECM), wiring harness, switches, sensors and fuel injectors.The engine ECM receives information from the sensors and from the switches on the engine. The engine ECM also receives information from the generator control module. The engine ECM and the generator control module continuously share information that enables both control modules to process information so it is possible to make decisions on the control of the overall genset. The engine ECM processes the information that is collected in order to make decisions on the control of the engine. The generator control module processes the information that is collected in order to make decisions on the control of the generator.Electronic Controls
Electronic Control Module
The ECM consists of two main components, the control computer (hardware) and the flash file. The control computer consists of a microprocessor and of electronic circuitry. The flash file contains the engine's operational characteristics. The operating maps influence the engine's performance.Engine Governor
The engine ECM governs engine speed. The engine ECM and the flash file work together by controlling the amount of fuel that is delivered by the injectors. Desired engine rpm is determined by the throttle position sensor signal and by certain sensor readings. Actual engine rpm is detected by the engine speed/timing sensor.Fuel Injection
The engine ECM controls the timing and the duration of the fuel that is injected. The engine ECM varies the signals to the fuel injectors. Fuel is injected only while an injector solenoid is energized by a 105 volt signal from the engine ECM. The timing of the injection signal determines the engine timing. The length of the injection signal determines engine speed. By controlling the timing and duration of the 105 volt signal, the ECM controls the engine speed.Engine Starting and Stopping Procedures
Engine Starting Sequence
1) The generator control module will receive one of the following start signals:
The operator places the