Air compressing injection internal combustion engine with an exhaust gas treating device for reducing nitrous oxides

Claim 1

Air-compressing fuel-injection internal-combustion engine (1) with an exhaust treatment device (10), to which reduction agents for the reduction of nitrogen oxides can be fed, and with a sensor (11; 12) sensing the temperature in the region of the exhaust treatment device (10), with a fuel injection system, comprising a high-pressure pump (3) and at least one injection nozzle (4) with fuel injection, provided for the combustion, as primary injection into the combustion chamber of the fuel-injection engine (1), and also with at least one secondary injection, influencing the effectiveness of the exhaust treatment device (10), both injections taking place with the same fuel within one operating cycle with a time interval from each other, characterized in that, in the case of a fuel injection system with a common-rail system (2) or electronically actuated unit fuel injector, the injection nozzle (4) provided for the primary injection is at the same time an injection nozzle for the secondary injection which, as a supplementary injection, takes place at the earliest in the region of the end phase of the combustion after the ignition top dead centre in such a way that the supplementary injection is an early supplementary injection commencing directly after the starting of the fuel-injection engine (1), for increasing the temperature of the exhaust of the exhaust treatment device (10) and/or that the supplementary injection is a late supplementary injection for reducing the nitrogen oxides of the exhaust treatment device (10).