| Cooling for exhaust gas recirculation |
| To improve the exhaust emission values, the exhaust gas recirculation system is equipped with a cooler that is connected into the engine cooling system. |
| Under certain operating conditions, the flow of exhaust gas that is recirculated to the combustion chamber is routed via this cooler. The exhaust gas temperature is thereby reduced, further lowering the combustion temperature and improving the exhaust emission values. |
| The engine control unit determines when the recirculated exhaust gas is routed via the cooler. The control unit actuates a vacuum unit via the exhaust gas cooler change-over valve -N345- which in turn operates the exhaust gas recirculation change-over flap. |
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