Auspuff- und Abgasrückführungsleitung einer Brennkraftmaschine

摘要

Means of recycling exhaust gases from a car engine (1) and recovering heat from them. During cold starting the exhaust gas passes through a heat exchanger to warm it before entering the catalyst. During normal operation some of the gas bypasses the exchanger and some is recycled. At full load (motorway driving), the gas is cooled in the exchanger to extend catalyst life A heat exchanger (7) and restriction (8) is between the engine and the catalyst (2), with some or all of the exhaust gas bypassing them. A recycling line (11) connects to the exchanger and restriction at one end to an air inlet (4) at the other, and the proportion of exhaust gases recycled is controlled ( means of restriction (8) are fixed, or comprise a valve with controllable opening. A controller closes the restriction in normal operation and opens it at full load. This controller closes the recycling line and directs the gas through the heat exchanger during cold starting. A preset proportion of gas is recycled during normal operation. The recycling line is closed and the gas passes through the exchanger at full load.