Advanced DPF loading monitoring with microwaves

Leslie  Bromberg, MIT

There is a need for accurate sensing of the amount of soot that has been captured by a diesel particulate filter (DPF). There are several methods to determine the loading of the trap. The most commonly used method is through the pressure drop across the trap.

Microwaves can be used to determine the status of the soot loading of the trap. In addition to determining the total amount of soot, the system is useful to provide some insight on the soot distribution throughout the trap. Microwave sensing used for this application could be inexpensive, consisting of inexpensive oscillators and detectors.

Experimental results will be provided with single 5.66” cordierite traps, at various levels of soot loading.

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