High pressure exhaust gas recirculation system with heat recovery

Abstract

The invention relates to a high-pressure exhaust gas recirculation system (1) of an internal combustion engine, especially a diesel engine. An exhaust gas recirculation pipe (8) branches from an exhaust gas pipe (6) located upstream of a turbocharger, wherein an exhaust gas recirculation valve (9) Mounted on this EGR pipe upstream of the EGR cooler (11) and open to the fresh air side (3) of the internal combustion engine (2). It is suggested that the connecting pipe (13) is branched from the exhaust gas recirculation pipe (8) and located downstream of the exhaust gas recirculation cooler (11), and opens towards the exhaust gas pipe (6), and the control element (12) is installed on the connecting pipe (13), said exhaust gas recirculation cooler (11) is connected to the cooling system of the internal combustion engine (2). The high-pressure exhaust gas recirculation system (1) combines the advantages of exhaust gas recirculation and heat recovery, wherein in one aspect of the present invention, the high-pressure exhaust gas recirculation system (1) can be controlled so that even when the exhaust gas recirculation or recirculated exhaust gas When cooling is not actually required, the exhaust gas flow flows through said EGR cooler (11), thus making it possible to use the heat inherent in the exhaust gas to influence the warm-up phase and selectively supply said heat to the cab heating (17 ).

Description

technical field [0001] The invention relates to a high pressure exhaust gas recirculation system of an internal combustion engine, especially a diesel engine, the exhaust gas recirculation pipe is branched from the exhaust gas pipe upstream of the turbocharger, wherein the exhaust gas recirculation valve is installed in the exhaust gas upstream of the exhaust gas recirculation cooler on the recirculation line and the exhaust gas recirculation line is open on the fresh air side of the internal combustion engine. The invention also relates to a method for controlling a high-pressure exhaust gas recirculation system. Background technique [0002] Exhaust gas recirculation systems are used in internal combustion engines to reduce emissions such as nitrogen oxides from the internal combustion engine. The recirculated exhaust gas is cooled by an exhaust gas cooler to further reduce nitrogen oxide (NOx) emissions. [0003] In high-pressure exhaust gas recirculation, the exhaust g...

AI Technical Summary

Problems solved by technology

[0011] The two systems, that is to say the exhaust gas recirculation system and the heat recovery system, together with their components, are provided separately, which requires a considerable installation space and can therefore only be used in a limited range or in motor vehicles superior

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