System description System description: EDC MS5 Engine speed 1 Engine speed 2 Charge air tempera- ture Needle move- ment sensor Boost pressure Coolant temperature Fuel tem- perature Throttle lever signal Control unit Intermediate engine speeds Diagnosis request Idle speed setting Safety relay Power supply terminal 30 Terminal 15 PWM signal ISO diagnosis Diagnosis warning lamp CAN bus The engine can be triggered elektrically with the 2,9 – 4,5V signal or alternatively CAN bus The controller contains the linear solenoid the control rod position transducer The linear solenoid is actuated by the electronic control unit.
The control unit processes information which it receives via the control rod position transducer the drive position selection charge-air pressure sensor coolant temperature sensor charge-air temperature sensor the engine rpm sensors the needle movement sensor and the fuel temperature sensor (in the injection pump). The diagnosis request pushbutton and the EDC indicator lamp are used in detecting faults and signalling them through a code. An ISO interface provides a communication with the MAN-cats test and diagnostic computer. The control unit, with its program adapted to the engine model concerned, determines the optimum setting of the control rod from all the measured values.
To ensure the vehicle can reach the nearest workshop in the event of one or several sensors failing, an emergency operation function is integrated in the control unit which, depending on the situation, enables the vessel to continue on its way, albeit with restricted functions. When the brakes are applied, the system operates as an intermediate engine speed controller with a pro- portional degree of 0, i.e. a set intermediate engine speed is maintained exactly provided the engine devel- ops sufficient power output for this purpose. 6