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US 2011/0252769 A1Published application
Diesel particulate filter overstress mitigation
AssigneeFord Global Technologies, LLC
InventorGary M. Crosbie
Life of this patent
Estimating the term…
Abstract
Methods and systems for reducing overstress of a DPF are provided herein. One example of such a method is based on a radial temperature gradient near the exit face of the diesel particulate filter. In this way, it becomes possible to more closely correlate radial stresses to actual risk of DPF fracture.
Claims14
1-18. (canceled)
A method for reducing particulate filter overstress, comprising:
- adjusting a frequency of subsequent particulate filter regenerations in response to a radial temperature gradient near an exit face of the particulate filter to maintain it below a maximum allowable radial temperature gradient, the maximum allowable radial temperature gradient adjusted responsive to filter age.
A particulate filter overstress mitigation apparatus, comprising:
- two temperature sensors located in an exit face portion of the particulate filter configured to measure a radial temperature gradient near the exit face of the particulate filter;
- and
- a controller configured to adjust a frequency of subsequent regenerations of the particulate filter if the measured radial temperature gradient is greater than a maximum allowable radial temperature gradient.
A particulate filter overstress mitigation apparatus, comprising:
- two exit-face temperature sensors configured to measure a radial temperature gradient near the exit face of the particulate filter;
- a deep temperature sensor configured to measure a deep temperature that is deeper into the filter;
- and
- a controller configured to adjust engine operating parameter if the measured radial temperature gradient is below a maximum allowable radial temperature gradient, the maximum allowable radial temperature gradient being modified based on the measured deep temperature, the maximum allowable radial temperature gradient corresponding to a temperature gradient below which mechanical stress experienced by the particulate filter are less than a maximum allowable stress.
1 more element
Dependencies are inferred from the claim text.