Group 30: Electrical system
Component description
11
Sensor, engine speed (flywheel)
The sensor is located on top of the flywheel housing.
The sensor is inductive. It reads the crankshaft speed
by means of milled slots on the outer radius of the fly-
wheel.
The signal is sent to the MDI, which calculates the
engines revolution speed.
Component description
MDI
The MDI* is connected to sensors and switches on
the engine. The MDI uses easylink instruments and/
or the Volvo Penta EVC display to present informa-
tion.
To the MDI a button panel is connected that controls
the start and stop function of the engine.
* MDI = ”Mechanical diesel interface”.
Switch, oil pressure, engine
Oil pressure is observed by a pressure switch in-
stalled in the engine block on the right side of the en-
gine. The switch is “normally open” in normal opera-
tion. If the oil pressure is too low, the switch closes.
When the engine is not running the switch is closed.
Sensor, coolant temperature
The sensors are located on the left side of the engine.
The sensor senses the engine coolant temperature
and sends the information to the MDI. The sensor
consists of a non-linear resistor, whose resistance
varies with coolant temperature. The resistance falls
as the coolant temperature rises.
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