Edge Seal Mounting Support for Diesel Particulate Filter 2005-01-3510
Due to the large size, high bulk density and high thermal expansion coefficient of the diesel particulate filter substrate; the conventional mounting system cannot provide the necessary radial mounting pressure. Mathematical and experimental results give the vibration and the back pressure force needed to mount the diesel particulate filter in the exhaust system. L-seal mounting support used in diesel particulate filter provides cushion to accommodate the linear tolerance of the substrate and the cone and also the necessary axial and radial mounting forces. L-seal axial and radial mounting forces are altered by type of material, surface characteristics, heat treatment and wire geometry. The proportional increase in compression force per unit weight during cycling shows dimensional consistency of the L-seal. The compression characteristics of A286 tremendously increase (>20%) during heat treatment as precipitation and hardening occurs. Further heat treatment at DPF regeneration temperatures doesn't alter the compression characteristics. A combination of A286 and 310 SS shows higher spring rate than all 310 SS. The compression force of L-seal stabilizes during cycling, retaining a residual force of more than 50% of its initial value. Within the elastic limit of the L-seal, the relative loss of force during cyclic compression as a function of closing gap is constant. Gas permeability of the L-seal is altered using wire geometry. L-seal provides combination of axial and radial mounting force for the DPF and meets the on-road durability requirement.