Automatic initiation system for regenerating a particulate...

Details Automatic initiation system for regenerating a particulate... Automatic initiation system for regenerating a particulate...

F - Mech Eng,Light,Heat,Weapons

01

N

183/72

F01N 3/02 (2006.01) F01N 3/027 (2006.01) F01N 3/032 (2006.01) F01N 9/00 (2006.01)

Patent

CA 1251743

-15- ABSTRACT A method and apparatus is disclosed for initiat- ing the energization of a regenerative apparatus used with a particulate filter trap having a porosity effec- tive to extract particulates from the exhaust gas flow of an internal combustion engine. The method comprises: (1) sensing the actual pressure drop across the filter trap and sensing the pressure drop across an open channel simulative filter structure: (2) converting the pressure drops to proportional voltages and ratioing the voltage of the filter trap pressure drop to the product of a constant and the voltage of the simulative filter struc- ture pressure drop; and (3) using the resultant voltage ratio to control the energization of the regeneration apparatus when the output exceeds a predetermined allow- able limit, e.g., 2-B volts. The apparatus employs a simulative filter structure fabricated of the same mono- lithic honeycomb celled ceramic as is the filter trap, except that the structure has a controlled porosity effective to permit the passage of substantially all particulates in the gas flow therethrough.

467647

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