System and method for filtering diesel engine exhaust particulates
AssigneeWoodward, Inc.
InventorClark Paterson
Life of this patent
Estimating the term…
Abstract
A diesel particulate filtering system that includes a filter configured to capture exhaust particulates from a diesel engine, a regeneration device configured to heat exhaust gases from the diesel engine prior to the exhaust gases reaching the filter, and a controller configured to control operation of the regeneration device, wherein the controller is further configured to turn the regeneration device on when a weighted average of a plurality of normalized parameter values exceeds a threshold value.
Claims20
A diesel particulate filtering system comprising:
- a filter configured to capture exhaust particulates from a diesel engine;
- a regeneration device configured to heat exhaust gases from the diesel engine prior to the exhaust gases reaching the filter;
- and
- a controller configured to control operation of the regeneration device;
- wherein the controller is further configured to turn the regeneration device on when a weighted average of a plurality of normalized parameter values exceeds a threshold value;
- and
- wherein the plurality of normalized parameter values comprises each of a normalized soot model value, a normalized timeout value, a normalized backpressure value, a normalized favorable conditions value, and a normalized ECU signal value.
A method for controlling the operation of a diesel particulate filtering system comprising:
- capturing in a filter particulates from the exhaust of a diesel engine;
- generating a normalized value for each of a plurality of parameters, the parameter values indicative of a need to initiate a regeneration event;
- assigning a weighting factor to each of the plurality of parameters, the weighting factor to be applied to the corresponding normalized value;
- calculating a weighted average value of the plurality of parameters;
- initiating a regeneration event when the weighted average value exceeds a threshold value;
- wherein generating a normalized value for each of a plurality of parameters comprises generating a normalized value for each of a soot model value, a timeout value, a backpressure value, a favorable conditions value, and an ECU signal value.
Dependencies are inferred from the claim text.