Zone of use....................................................................................................................................................................A1

Inlet and exhaust

Zone of use

The EGR system is active when all the following conditions are met: – Engine hot. – Engine speed > 1 400 rev/min. – Load > 40%.

y 1

40 % A B

(~ 10 %)

60ahsm22

Description

1 Progressive opening zone. A EGR system inactive. B EGR active.

In zone (B), the recycling rate is about 10%. The recycling rate is monitored using 3 pieces of information: (compressed fresh air temperature, recycled exhaust gas temperature, and mixed air temperature). Variation in the quantity of gas recycled is controlled by turbocharger control. In case of effectiveness problem with the recycling system, an error code is announced.

1 500 x

Fig. 36

X Engine speed in rpm. Y torque in %.