Function principle and target values
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Without vacuum, the bypass flap is closed, i.e.: The exhaust flows through the exhaust-gas recirculation cooler. If a partial vacuum is applied, the bypass flap opens the bypass and simultaneously closes the inlet to the EGR cooler. The exhaust gas is routed past the EGR cooler directly to the intake air collector. The bypass of the EGR cooling is opened during EGR operation if the coolant temperature is lower than 50 °C.
| Item | Explanation |
|---|---|
| 1 | Bypass flap closed |
| 2 | Bypass flap opened |
Observe the following nominal values for the electric changeover valve bypass flap:
| Variable | Value |
|---|---|
| Voltage range | 9 to 16 V |
| Operating pressure | 0.8 to 1.5 bar |
| Power consumption | 0.55 A |
| Temperature range | -40 to 140 deg C |