US12553873B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12553873-B2 |
| Application number | US-202017615205-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 25, 2020 |
| Priority date | Jul 22, 2019 |
| Publication date | Feb 17, 2026 |
| Grant date | Feb 17, 2026 |
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Official abstract text for this publication.
In order to allow an analyzer to be calibrated or a sampling channel to be purged without removing a sampling probe from a sampling location, provided are a sampling channel through which an exhaust gas from an internal combustion engine flows, an analyzer that is connected to the sampling channel and analyzes the exhaust gas, a diluter provided upstream of the analyzer in the sampling channel, a recirculated channel that branches from a branch point set between the analyzer and the diluter in the sampling channel and joins the diluter, a pump that is provided in the recirculated channel and guides part of the exhaust gas from the branch point to the diluter, an additional channel that is connected to the recirculated channel or the sampling channel and through which a calibration gas or a purge gas flows, and an opening and closing mechanism provided in the additional channel.
Opening claim text (preview).
The invention claimed is: 1 . An exhaust gas analyzing device comprising: a sampling channel through which an exhaust gas from an internal combustion engine flows; an analyzer that is connected to the sampling channel and analyzes particulate matter in the exhaust gas; a diluter provided upstream of the analyzer in the sampling channel; a recirculation channel that branches from a branch point set between the analyzer and the diluter in the sampling channel, joins the diluter, and directs part of the exhaust gas flowing through the sampling channel from downstream to upstream of the sampling channel; a pump that is provided in the recirculation channel to move the part of the exhaust gas flowing through the sampling channel toward the analyzer from downstream to upstream of the sampling channel by returning the part of the exhaust gas from the branch point to the diluter through the recirculation channel; an additional channel that is connected to the recirculation channel or the sampling channel and through which a calibration gas or a purge gas flows; and an opening and closing mechanism provided in the additional channel, wherein an additional flow rate as a flow rate of the calibration gas or the purge gas introduced from the additional channel into the recirculation channel or the sampling channel is larger than an analysis gas flow rate as a flow rate of a gas introduced into the analyzer, and wherein the recirculation channel is provided with a first filter that captures the particulate matter. 2 . The exhaust gas analyzing device according to claim 1 , wherein when the opening and closing mechanism is opened, part of the calibration gas or the purge gas introduced from the additional channel into the recirculation channel flows to upstream of the sampling channel through the diluter. 3 . The exhaust gas analyzing device according to claim 1 , wherein an additional flow rate as a flow rate of the calibration gas or the purge gas introduced from the additional channel into the recirculation channel is smaller than a supply flow rate as a flow rate of a gas supplied from the recirculation channel to the diluter. 4 . The exhaust gas analyzing device according to claim 1 , wherein the analyzer analyzes a component contained in the exhaust gas in a state where the opening and closing mechanism is closed, and the calibration gas or the purge gas flows through the additional channel in a state where the opening and closing mechanism is opened. 5 . The exhaust gas analyzing device according to claim 1 , wherein the recirculation channel is provided with a first filter that captures the particulate matter. 6 . The exhaust gas analyzing device according to claim 5 , wherein the first filter is provided upstream of the pump in the recirculation channel. 7 . The exhaust gas analyzing device according to claim 6 , wherein the additional channel is connected between the pump and the first filter in the recirculation channel. 8 . The exhaust gas analyzing device according to claim 1 , wherein the additional channel is provided with a filter that captures a particulate matter in an atmosphere, and the atmosphere having passed through the filter as the calibration gas or the purge gas is introduced into the recirculation channel or the sampling channel from the additional channel in a state where the opening and closing mechanism is opened. 9 . The exhaust gas analyzing device according to claim 1 , further comprising a dehumidifier provided downstream of the pump in the recirculation channel. 10 . A method of supplying a gas to an exhaust gas analyzing device including a sampling channel through which an exhaust gas from an internal combustion engine flows, an analyzer that is connected to the sampling channel and analyzes particulate matter in the exhaust gas, a diluter provided upstream of the analyzer in the sampling channel, a recirculation channel that branches from a branch point set downstream of the diluter in the sampling channel, is connected to the diluter, and directs part of the exhaust gas flowing through the sampling channel toward the analyzer from downstream to upstream of the sampling channel, and a pump that is provided in the recirculation channel to move the part of the exhaust gas flowing through the sampling channel from downstream to upstream of the sampling channel by returning the part of the exhaust gas from the branch point to the diluter through the recirculation channel, the method comprising: connecting an additional channel through which a calibration gas or a purge gas flows to the recirculation channel or the sampling channel, and guiding the calibration gas or the purge gas to the sampling channel by opening an opening and closing mechanism provided in the additional channel, wherein an additional flow rate as a flow rate of the calibration gas or the purge gas introduced from the additional channel into the recirculation channel or the sampling channel is larger than an analysis gas flow rate as a flow rate of a gas introduced into the analyze, and wherein the recirculation channel is provided with a first filter that captures the particulate matter. 11 . An exhaust gas analyzing device comprising: a sampling channel through which an exhaust gas from an internal combustion engine flows; an analyzer that is connected to the sampling channel and analyzes particulate matter in the exhaust gas; a diluter provided upstream of the analyzer in the sampling channel; a recirculation channel that branches from a branch point set between the analyzer and the diluter in the sampling channel, joins the diluter, and directs part of the exhaust gas flowing through the sampling channel from downstream to upstream of the sampling channel; a pump that is provided in the recirculation channel to move the part of the exhaust gas flowing through the sampling channel toward the analyzer from downstream to upstream of the sampling channel by returning the part of the exhaust gas from the branch point to the diluter through the recirculation channel; an additional channel that is connected to the recirculation channel or the sampling channel and through which a calibration gas or a purge gas flows; and an opening and closing mechanism provided in the additional channel, wherein an additional flow rate as a flow rate of the calibration gas or the purge gas introduced from the additional channel into the recirculation channel is larger than an analysis gas flow rate as a flow rate of a gas introduced into the analyzer, and wherein the recirculation channel is provided with a first filter that captures the particulate matter.
by diluting a gas · CPC title
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