Importance

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Abstract

A motor vehicle has an internal combustion engine with an external exhaust gas recirculation system in the form of an exhaust gas return duct connecting an exhaust duct to an intake duct and the vehicle passenger compartment has a heater with a heat exchanger receiving a fluid heat transfer medium. At least part of the structure of the exhaust return duct has two walls, and heat transfer medium flows through the space formed between the walls, providing an exhaust return heat exchanger which transfers the heat removed from the returned exhaust gas to the heat transfer medium which provides the heater with additional heating power so that additional heater frequently required for heaters used with engines having a high degree of efficiency is not required for operation of the motor vehicle when outdoor temperatures are low. Also, nitrogen oxide emissions are reduced by lowering the maximum combustion temperature, and fuel consumption is reduced.

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First Claim