DPF regeneration monitoring method
AssigneeInternational Engine Intellectual Property Company, LLC
InventorsPatrick D. Barasa, Timothy J. Gundrum
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Abstract
A method for operating an internal combustion engine (100) and exhaust system therefor includes the step of initiating a regeneration event in a diesel particulate filter (DPF 109) (401). A first oxygen concentration (213) of a gas upstream of the DPF 109, and a second oxygen concentration (215) of the gas downstream of the DPF 109 are sensed (403) to infer a rate of combustion of material in the DPF (405) based on the difference between the first (213) and the second (215) oxygen concentrations. The rate of combustion is compared to a threshold value (409) and the regeneration event in the DPF 109 is terminated (411) if the rate of combustion is above the threshold.
Claims11
A method comprising the steps of:
- initiating a regeneration event in a diesel particulate filter (DPF);
- sensing a first oxygen concentration of a gas upstream of the DPF, and a second oxygen concentration of the gas downstream of the DPF;
- inferring a rate of combustion of material in the DPF based on a difference between the first and the second oxygen concentrations;
- comparing the rate of combustion with a predetermined rate of combustion;
- terminating the regeneration event in the DPF if the rate of combustion is above the predetermined rate of combustion.
A method comprising the steps of:
- sensing a first oxygen concentration upstream of a diesel particulate filter (DPF);
- sensing a second oxygen concentration downstream of the DPF;
- determining an exhaust gas velocity for exhaust gas passing through the DPF;
- estimating a total carbon mass deposit on a filter;
- and
- calculating a parameter of the filter based on the first oxygen concentration, the second oxygen concentration, the exhaust gas velocity, the total carbon mass deposit, and a constant value, wherein the constant value is at least one of a bulk material density of the filter and a bulk heat capacity of the filter, and wherein the calculated parameter of the filter is at least one of a temperature of the filter and a rate of combustion in the filter.
Dependencies are inferred from the claim text.