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US 2006/0179821 A1Published application
Regeneration control for diesel particulate filter for treating diesel engine exhaust
AssigneeSouthwest Research Institute
InventorsRijing Zhan, Yiqun Huang
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Abstract
A method and system for controlling exhaust gas temperature at a diesel particulate filter during regeneration. The temperature rise is controlled at a rate that will prevent harm to the filter caused by high temperatures and rapid increases.
Claims14
A method of regenerating a diesel particulate filter (DPF) in the exhaust line of a diesel engine, comprising:
- increasing the temperature at the DPF to a regeneration temperature;
- wherein the increasing step is performed at least in part by injecting supplemental fuel upstream the DPF, using a variable fuel injection rate;
- controlling the rate of the increasing step such that temperature increases occur substantially linearly during an optimal temperature increase period;
- and
- maintaining the regeneration temperature during a regeneration period.
2 more elements
A method of testing diesel particular filters (DPF's) for use in diesel engine emissions systems, comprising:
- loading the DPF with particulate matter from exhaust of the engine;
- increasing the temperature of the DPF to a regeneration temperature;
- wherein the increasing step is performed at a first temperature increase rate;
- repeating the increasing step for a number of different temperature increase rates;
- and
- determining the highest temperature increase rate at which the DPF does not undergo damage from thermal stress.
3 more elements
Dependencies are inferred from the claim text.