The diagram shows the two-module system. On the single-module system the IDM is integrated in the PCM.
1 Pilot injection and main injection fuel quantity
2 IDM
3 PCM
4 Fuel injector
5 CKP sensor
6 CHT sensor
7 Injection signal
Diesel engines normally run without the use of a throttle valve and therefore always operate with an excess of air.
The torque or power output of the diesel engine is only changed by the amount of fuel that is made available (injected fuel quantity).
Two different strategies are used when calculating the fuel metering:
• engine starting,
• engine running.
