SSANGYONG KYRON 2010.01 Manual page 126

5) Pilot Flow Control
The pilot flow represents the amount of fuel injected into the cylinder during the pilot injection.
This amount is determined according to the engine speed and the total flow.
- A first correction is made according to the air and water temperature.
This correction allows the pilot flow to be adapted to the operating temperature of the
engine. When the engine is warm, the ignition time decreases because the end-of-
compression temperature is higher. The pilot flow can therefore be reduced because there
is obviously less combustion noise when the engine is warm.
- A second correction is made according to the atmospheric pressure.
This correction is used to adapt the pilot flow according to the atmospheric pressure and
therefore the altitude.
During starting, the pilot flow is determined on the basis of the engine speed and the coolant
temperature.
6) Cylinder Balancing Strategy
▶ Balancing of the point to point flows
The pulse of each injector is corrected according to the difference in instantaneous speed
measured between 2 successive injectors.
- The instantaneous speeds on two successive injections are first calculated.
- The difference between these two instantaneous speeds is then calculated.
- Finally, the time to be added to the main injection pulse for the different injectors is
determined. For each injector, this time is calculated according to the initial offset of the
injector and the instantaneous speed difference.
▶ Detection of an injector which has stuck closed
The cylinder balancing strategy also allows the detection of an injector which has stuck closed.
The difference in instantaneous speed between 2 successive injections then exceeds a
predefined threshold. In this case, a fault is signaled by the system.
09-15
1491-01
ENGINE CONTROL SYSTEM
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