Controlling soot burn-off in diesel engine, involves initiating burn-off by raising exhaust gas temperature into filter at least to reaction level of additive-free exhaust gas with deposited soot

摘要

The method involves initiating soot burn-off if the soot filter charge exceeds a specified threshold. This is achieved by raising the temperature of the exhaust gases entering the filter at least to the reaction level of the additive-free exhaust gas with deposited soot. The level is then held at least until the burn-off starts, reducing the temperature to give adequate oxygen and limiting the mass flow of oxygen into exhaust gas taking into account maximum burn rate. Independent claims are also included for the following: an arrangement for implementing the method and a diesel engine with such a device.