Patent ID: 8161807
Filing Date: 2012-04-24
Classification: F01N,Y02T

Abstract:
1. A device of detecting an accumulation amount of particulates, the device comprising: a filter for trapping particulates from a gas containing the particulates; a container for containing the filter; an upstream pipe provided on the upstream side of the container to lead the gas into the container; a downstream pipe provided on the downstream side of the container to lead the gas passed through the filter; an upstream detecting unit fitted to the upstream pipe, the upstream detecting unit comprising a branch flow route for leading the gas from the upstream pipe into the branch flow route, an upstream trapping portion provided in the branch flow route, a transmitting portion transmitting an electromagnetic wave to the upstream trapping portion, and a receiving portion receiving the electromagnetic wave from the upstream trapping portion; and a downstream detecting unit fitted to the downstream pipe, the downstream detecting unit comprising a branch flow route for leading the gas from the downstream pipe into the branch flow route, a downstream trapping portion provided in the branch flow route, a transmitting portion transmitting an electromagnetic wave to the downstream trapping portion, and a receiving portion receiving the electromagnetic wave from the downstream trapping portion, wherein an amount of the particulates trapped in the filter is detected based on a difference between a detection value of the mass of the particulates trapped in the upstream trapping portion and a detection value of the mass of the particulates trapped in the downstream trapping portion.