SEAL-U-CUP 1915646 - Caterpillar

System Operation
Illustration 1 g01325275
Schematic diagram of the fuel system
(1) Fuel injection pump
(2) Electronic Control Module (ECM)
(3) Voltage Load Protection Module (VLPM)
(4) Diagnostic connector
(5) Electronic service tool
(6) 36 -1 tooth crankshaft gear
(7) Speed/timing sensor
(8) Intake manifold pressure sensor
(9) Engine oil pressure sensor
(10) Intake manifold air temperature sensor
(11) Engine coolant temperature sensor
(12) Machine interface connector The 3054E and 3056E engines were designed for electronic control. The engines include an Electronic Control Module (ECM), a fuel injection pump that is electronically controlled, and various engine sensors. The ECM controls the engine operating parameters through the software within the ECM and the inputs from the sensors. The software contains parameters that control the engine operation. The parameters include all of the operating maps and customer selected parameters.The electronic system consists of the Electronic Control Module (ECM), the engine sensors, and the Machine Interface Connector (MIC). The ECM is the computer. The flash file is the software for the computer. The flash file contains the operating maps. The operating maps define the following characteristics of the engine:
Torque curves
Engine speed (rpm)
Fuel injection timingElectronic Controls
Illustration 2 g01292628
Schematic diagram of the fuel pump
(1) Pressure regulator
(2) Electronic control module (ECM)
(3) Cam ring
(4) Speed/timing sensor
(5) Electronic control unit for the fuel injection pump
(6) Fuel lift pump
(7) Fuel solenoid valve
(8) Distributor plunger
(9) Fuel injector
(10) Fuel transfer pump
(11) Timing solenoid valve
(12) Timing advance mechanism
(13) Roller
(14) Cam plate
(15) Delivery valve Engine Governor
The ECM controls the injection timing and the amount of fuel that is delivered to the cylinders. The amount of fuel that is delivered by the fuel injection pump is based on the actual conditions and the desired conditions at any given time.The governor compares the desired engine speed to the actual engine speed. The actual engine speed is determined through the primary speed/timing sensor and the secondary speed/timing sensor. If the desired engine speed is greater than the actual engine speed, the governor injects more fuel in order to increase engine speed. If the actual engine speed is greater than the desired engine speed, the governor reduces the amount of fuel that is supplied to the injectors in order to reduce engine speed.Timing Considerations
Once the governor has calculated the amount of fuel that is required, the governor must determine the timing of the fuel injection. Fuel injection timing is controlled by the ECM after calculating inputs from the following components:
Engine coolant temperature sensor
The sensor for the intake manifold air temperature
The sensor for the intake manifold pressure
Speed/timing sensorAt start-up, the ECM determines the top center position of the number 1 cylinder from the speed/timing sensor in the fuel injection pump. The ECM calculates the time when fuel injection should occur relative to the top center position. The ECM provides the signal to the fuel solenoid valve in the fuel injection pump which stops fuel flow to the low pressure side. The fuel injection pump then forces fuel to flow to the fuel injectors at the desired time. The ECM adjusts timing for the best engine performance, the best fuel economy and the