Patent ID: 7997069
Filing Date: 2011-08-16
Classification: F01N,Y02T

Abstract:
1. A method for reducing ash accumulation in an electrically heated particulate matter (PM) filter, comprising: estimating a position of an oxidation wave within the electrically heated PM filter; estimating a temperature of the oxidation wave within the electrically heated PM filter; determining whether the position of the oxidation wave is within an ash zone of the electrically heated PM filter, wherein the ash zone is located near a downstream end of the electrically heated PM filter; decreasing the temperature of the oxidation wave when the position of the oxidation wave is within the ash zone and the temperature of the oxidation wave is greater than a predetermined temperature; and increasing the temperature of the oxidation wave when the position of the oxidation wave is within the ash zone and the temperature of the oxidation wave is less than the predetermined temperature.