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| Illustration 1 | g01075897 |
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Left side views of a 50 Hz engine and of a 60 Hz engine | |
The fuel metering valve is electrically controlled and electrically actuated. The fuel metering valve and the master Electronic Control Module (ECM) communicate via the CAN data link.
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| Illustration 2 | g01076785 |
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Right side view | |
The throttle actuator is electrically controlled and hydraulically actuated. The ECM issues a throttle command to the throttle actuator. The throttle command represents a percent of the level of electrical current. The output can be viewed on Cat ET. The actual throttle position can be viewed on a mechanical pointer that is built into the mechanism of the throttle.
Sensors provide information to the electronic control modules. The information enables the modules to control the engine as efficiently as possible over a wide range of operating conditions. The information is used for monitoring engine operation.
The sensors also enable the activation of alarms and of shutoffs in response to abnormal operation. Illustrations 3, 4, and 5 show the locations of the sensors. Refer to Systems Operation/Testing and Adjusting, "Engine Sensors" for the descriptions of the sensors.
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| Illustration 3 | g01075909 |
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Right side view (1) Electrohydraulic actuator's pressure switch (2) Inlet air temperature sensor (3) Engine coolant temperature sensor (4) Pressure switch for the coolant pump (inlet) (5) Detonation sensor | |
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| Illustration 4 | g01075962 |
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Left side view (6) Pressure sensor for unfiltered oil (7) Pressure sensor for filtered oil (8) Oxygen sensor (if equipped) (9) Engine coolant pressure sensor (outlet) (10) Inlet air pressure sensor (11) Engine oil temperature sensor (12) Buffer for the oxygen sensor (if equipped) (13) Speed/timing sensor | |
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| Illustration 5 | g01075976 |
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Left side views of the 50 Hz and 60 Hz engines (14) Humidity sensor (if equipped) (15) Atmospheric pressure sensor (if equipped) | |
Integrated Temperature Sensing Module (ITSM) and Thermocouples
Thermocouples provide information to the ITSM. The information is used to monitor engine operation. The thermocouples also enable alarms and shutoffs to be activated. The ITSM monitors all of the thermocouples. The ITSM broadcasts the temperature readings of the thermocouples over the Cat Data Link for use by other modules.
Illustration 6 shows the locations of the ITSM and of the thermocouples. Refer to Systems Operation/Testing and Adjusting, "Integrated Temperature Sensing Module" for the descriptions of the components.
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| Illustration 6 | g01105701 |
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Left side view (1) ITSM (2) Thermocouple for the temperature of the cylinder exhaust port (3) Thermocouple for the temperature of the exhaust inlet to the turbocharger turbine (4) Thermocouples for the temperature of the turbocharger exhaust outlet | |