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Diesel exhaust soot sensor system and method

A technology for diesel and carbon deposits, applied in the system field, can solve the problems of self-ignition of carbon deposits and/or unsafe, uncontrolled, and overall engine efficiency reduction.

Inactive Publication Date: 2011-05-04
WOODWARD GOVERNOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If regeneration is not initiated until the DPF is heavily charged, overall engine efficiency will be unduly reduced as discussed above, and there is a risk that carbon deposits may spontaneously ignite and / or combustion may be unsafe and uncontrolled risk

Method used

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  • Diesel exhaust soot sensor system and method
  • Diesel exhaust soot sensor system and method
  • Diesel exhaust soot sensor system and method

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Embodiment Construction

[0025] Now turning to the attached image, figure 1 One embodiment of a system 100 constructed in accordance with the teachings of the present invention capable of determining an appropriate time to initiate regeneration of a diesel particulate filter (DPF) 102 is shown in FIG. As discussed above, the DPF 102 is installed before or upstream of the exhaust outlet 104 to filter out particulates from the diesel engine exhaust. To clean collected particles, such as soot, from the DPF 102, a burner 108 may be used upstream of the DPF 102 but downstream from the exhaust gas inlet 106 of the engine. Such burners 108 may be any auxiliary source of heat, such as fuel burners, as well as electric burners, RF burners, DOC, or via altered engine operation. Engine exhaust flows through opening 114 of combustor 102 and through DPF 102 before being expelled to the environment via exhaust outlet 104 .

[0026] In the fuel burner 108, fuel and air are supplied via a fuel valve 110 and an air ...

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Abstract

Systems and methods to determine when regeneration of a diesel particulate filter (DPF) are presented. Such determination is made by indirectly determining soot accumulation in the DPF by monitoring soot accumulation on a regeneration burner spark plug based on the correlation between spark plug fouling and DPF soot loading. An ion current sensing circuit is used during periods of no flame to determine soot loading on the spark plug. When soot loading on the spark plug approaches an amount that could cause fouling of the spark plug, the ignition controller initiates a hot spark to burn the soot off on the spark plug. The number of such cleaning events is tracked and used to determine when the DPF soot loading is at a level that regeneration should be initiated. Temperature rise across the DPF is monitored and used to adjust the number of spark plug cleaning events needed before initiating regeneration.

Description

technical field [0001] The present invention relates generally to diesel particulate filter (DPF) systems, and more particularly to a system and method for determining soot (soot) accumulation in a DPF to more efficiently initiate a regeneration process to burn off the accumulation Carbon deposits in the DPF. Background technique [0002] Increasing environmental constraints and regulations are causing diesel engine manufacturers and assemblers to develop technologies that improve and reduce the environmental impact of said engine operation. As a result, a great deal of design work has been devoted to the control of the combustion process within the running engine itself in the hope of increasing fuel economy and reducing, for example, NO x and particle emissions. However, given the operating variables and parameters the diesel engine is operating on and given the NO x Given the trade-off between particulate generation and particulate generation, many engine manufacturers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/025F01N9/00F01N3/023F01N3/38
CPCF01N3/025F01N2570/10
Inventor T·A·让德龙E·范戴尼
Owner WOODWARD GOVERNOR CO
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