Reducing Heating Of A Particulate Filter During A Regeneration Event

A particulate filter and particulate trap technology, which is applied in the direction of machines/engines, vehicle components, engine components, etc., and can solve problems such as particulate filter material combustion and thermal damage to surrounding components
CN107448261AActive Publication Date: 2017-12-08FORD GLOBAL TECH LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FORD GLOBAL TECH LLC
Publication Date
2017-12-08

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Abstract

A method is disclosed for reducing the heating of a particulate filter 15, eg a DPF, during a regeneration event when the engine 10, eg a diesel engine of a mild hybrid vehicle, is decelerating due to an accelerator pedal tip-out (deceleration fuel cut-off event). The method comprises using an electric machine 16, eg an integrated starter / generator, to apply a load to the engine 10 by charging the battery 17, and compensating for the increase in applied load by increasing an engine torque demand thereby requiring fuel to be supplied to the engine 10. The fuel flow reduces the concentration of oxygen in the exhaust gas thereby reducing the intensity of soot combustion within the particulate filter 15 and reducing the peak temperature within the particulate filter 15 during the regeneration event.
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Description

technical field

[0001] The present invention relates to a particulate filter arranged to receive exhaust gas from an engine of a motor vehicle, and in particular to a method of protecting the particulate filter from overheating during a regeneration event when the engine decelerates due to tip-out. Background technique

[0002] It is well known to provide a particulate filter (Particulate Filter, PF) in the exhaust system of an engine to filter soot particles from the exhaust gas flowing from the engine to the atmosphere. When the engine is a diesel engine, this particulate filter is often referred to as a Diesel Particulate Filter or "DPF".

[0003] In a so-called "deceleration fuel cutoff" condition, where fuel to the vehicle's engine is cut off during a tip-out event to save fuel during vehicle deceleration, the particulate filter (PF) may become damaged. If the fuel supply to the engine is cut off while the soot combustion process known as a "regeneration event" is acti...

Claims

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