76-00-00 Engine Control System
1. General
This chapter contains information how to remove/install and examine the engine control system
components.
2. System Description/Operation
A. Engine Electronic Control Unit (EECU)
The EECU is a 28V supplied device which consists of two equivalent parts: ECU A and ECU B.
Each ECU can control the engine itself. At each self-test, a test of the two ECU channels shall be done.
Usually, the ECU with less operating hours will be selected as active. The other ECU channel is in hot
standby that means active, evaluates sensor values but not operating actuators.
If a failure occurs on one ECU, an internal voter can select the alternative channel.
If different types of failures occur at the same time, the selection decision is based on failure
importance level.
The pilot can select the ECU channel manually.
The interface to the engine indications in the A/C is done via a serial Bus (CAN-Bus).
The pilot interface is done over Power Lever Sensors. Each ECU has a separate sensor. Each sensor
has two outputs which are used to do plausibility checks of the sensor.
Sensors
Power Lever Sensor
- Power Lever Sensor position evaluation
- Hall Effect Sensor with dual output
Crankshaft Sensor
- Engine speed evaluation
Camshaft Sensor
- Used to identify the position of the camshaft
Fuel Pressure Sensor
- Used for evaluation of the fuel pressure at high pressure pump inlet
Oil Pressure Sensor
- Used for evaluation of the engine oil pressure
Rail Pressure Sensor
- Used to evaluate the rail pressure
Boost Pressure Sensor
- Boost (Intake Air) Pressure evaluation
Coolant Temperature Sensor
- Used for coolant temperature evaluation
Fuel Temperature Sensor
- Used for fuel temperature evaluation
Gearbox Oil Temperature Sensor
- Used for gearbox oil temperature evaluation
Engine Oil Temperature Sensor
- Combinant Sensor used for engine oil temperature evaluation
Intake Air Temperature Sensor
- Intake Air Temperature evaluation
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