EXHAUST EMISSION CONTROL DEVICE

• Main Author: NAKATA SHINGO
• Format: Patent
• Language: English; Japanese
• Published: 24.11.2016
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide an exhaust emission control device that can highly accurately determine an abnormality of a filter on the basis of a pressure difference between an upstream side and a downstream side of the filter.SOLUTION: An exhaust emission control device CA includes: an actual differential pressure acquisition section 401 for acquiring actual differential pressure that is an actual measurement value of a pressure difference between an upstream side and a downstream side of a filter 12; a flow rate acquisition section 402 for acquiring a flow rate of exhaust gas made to flow into a filter 12; a computation differential pressure calculation section 403 for calculating computation differential pressure that is a calculated value of a pressure difference between the upstream side and the downstream side of the filter 12 when exhaust gas having the flow rate acquired by the flow rate acquisition section 402 is made to flow into the filter 12 in the normal state; and an abnormality determination section 404 for determining an abnormality of the filter 12. The abnormality determination section 404 determines an abnormality of the filter 12 on the basis of a differential pressure change amount ratio that is a ratio between change amount of the actual differential pressure caused by a flow rate change of the exhaust gas and change amount of the computation differential pressure.SELECTED DRAWING: Figure 1 【課題】フィルタの上流側と下流側との圧力差に基づいてフィルタの異常判定を高い精度で行うことが可能な排出ガス浄化装置を提供する。【解決手段】排出ガス浄化装置ＣＡは、フィルタ１２の上流側と下流側との圧力差の実測値である実差圧を取得する実差圧取得部４０１と、フィルタ１２に流入する排出ガスの流量を取得する流量取得部４０２と、正常状態のフィルタ１２に、流量取得部４０２によって取得した流量の排出ガスが流入した場合のフィルタ１２の上流側と下流側との圧力差の計算値である計算差圧を算出する計算差圧算出部４０３と、フィルタ１２の異常判定を行う異常判定部４０４と、を備える。異常判定部４０４は、排出ガスの流量変化に伴う実差圧の変化量と計算差圧の変化量との比である差圧変化量比に基づいて、フィルタ１２の異常判定を行う。【選択図】図１