Control for diesel engine with particulate filter
AssigneeFord Global Technologies, LLC
InventorsMichiel J. van Nieuwstadt, Tom Alan Brewbaker
Life of this patent
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Abstract
A system and method are described for operating a diesel engine and particulate filter during self-sustained filter regeneration. In particular, a method is described for preventing over-temperature during filter regeneration by limiting excess oxygen supplied to the particulate filter.
Claims15
A method for regenerating a particulate filter coupled to an internal combustion engine, comprising:
- commencing a self-sustaining filter regeneration;
- monitoring whether said regeneration causes temperature of said particulate filter to become greater than a predetermined value;
- in response to said monitoring, adjusting one or more operating parameters so as to limit exothermic reaction via control of an excess oxygen amount entering said filter and prevent temperature from rising to become greater than a pre-selected value.
A method for operating an engine coupled to a diesel particulate filter, the engine having an electronically controlled valve that adjusts oxygen flow entering the engine, the method comprising:
- detecting temperature indicative of said diesel particulate filter;
- controlling air flow via the valve based on said detected temperature so as to prevent temperature of the diesel particulate filter from rising to a point that causes degradation due to excessive exothermic reaction, while continuing filter regeneration.
A system comprising:
- a diesel engine;
- an electronically controlled valve coupled to said engine;
- a diesel particulate filter coupled to said engine;
- and
- a controller for commencing self-sustaining regeneration of said particulate filter, determining a desired oxygen flow, and adjusting said valve to provide said desired flow.
A system comprising:
- a diesel engine;
- an electronically controlled valve coupled to said engine;
- a diesel particulate filter coupled to said engine;
- and
- a controller for commencing self-sustaining regeneration based on an engine operating condition, determining if conditions are such that temperature of said particulate filter should be controlled, and in response to said determination, calculating a desired oxygen flow rate and adjusting said valve to provide said desired flow rate.
A system comprising:
- a diesel engine;
- an electronically controlled valve coupled to said engine;
- a diesel particulate filter coupled to said engine;
- and
- a controller for commencing self-sustaining regeneration of said particulate filter, determining temperature of the filter, and if said temperature is greater than a limit, adjusting said valve to reduce oxygen entering said filter and limit said self-sustaining regeneration reaction.
Dependencies are inferred from the claim text.