Exhaust gas analyzing apparatus

Patent metadata

Field	Value
Publication number	US-9468877-B2
Application number	US-201313899952-A
Country	US
Kind code	B2
Filing date	May 22, 2013
Priority date	May 22, 2012
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

An exhaust gas analyzing apparatus provided a first filter flow path with a first filter, a second filter flow path provided with a second filter, an exhaust gas analyzing part for analyzing exhaust gas passing through the first filter or the second filter, a flow path switching mechanism for switching between the first filter flow path and the second filter flow path. A pulse purge mechanism is provided for supplying purge gas to the filters, in the filter flow paths, in a pulsed manner, and in the case where a pressure difference between an upstream side and a downstream side of the filter provided in one filter flow path where the exhaust gas flows becomes equal to or larger than a predetermined value, the one filter flow path is switched to the other one, and purge gas is supplied to the filter provided in the one filter flow path in the pulsed manner.

First claim

What is claimed is:

1. An exhaust gas analyzing apparatus for analyzing exhaust gas, the apparatus comprising:
a first filter flow path provided with a first filter for passing the exhaust gas therethrough and a first sensor for detecting clogging of the first filter;
a second filter flow path provided with a second filter for passing the exhaust gas therethrough and a second sensor for detecting clogging of the second filter;
an exhaust gas analyzing part for analyzing combustion byproduct components contained in the exhaust gas passing through the first or second filters;
a flow path switching mechanism for selectively passing the exhaust gas to the first or second filter flow paths;
a pulse purge mechanism provided in each of the first and second filter flow paths, the pulse purge mechanism for supplying purge gas to each of the first and second filters in a pulsed manner;
a first filter heating mechanism for heating the first filter;
a second filter heating mechanism for heating the second filter; and
one or more computers programmed to execute
a switching control part, in the case where an output value of one of the first and second sensors corresponding to one of the first and second filter flow paths through which the flow path switching mechanism is passing the exhaust gas falls outside a predetermined range, for causing the flow path switching mechanism to stop passing the exhaust gas through the one of the first and second filter flow paths and to start passing the exhaust gas through the other of the first and second filter flow paths,
a pulse purge control part, in the case where the flow path switching mechanism stops passing the exhaust gas through the one of the first and second filter flow paths and starts passing the exhaust gas through the other of the first and second filter flow paths, for causing the pulse purge mechanism to supply the purge gas to one of the first and second filters corresponding to the one of the first and second filter flow paths in a pulsed manner, and
a filter heater control part for causing a corresponding one of the first and second filter heater mechanisms to heat the other of the first and second filters at least just before the switching mechanism stops passing the exhaust gas through the one of the first and second filter flow paths and starts passing the exhaust gas through the other of the first and second filter flow paths.

2. The exhaust gas analyzing apparatus according to claim 1 , wherein a temperature of the purge gas supplied to the one of the first and second filters heats the one of the first and second filters.

3. The exhaust gas analyzing apparatus according to claim 1 , further comprising a mode selection signal accepting part for accepting a mode selection signal for switching between an automatic mode and a manual mode, wherein the automatic mode is configured such that the switching control part automatically determines a switching timing for the flow path switching mechanism to switch between the first and second filter flow paths in the case where the output value of the one of the first and second sensors falls outside the predetermined range and wherein the manual mode is configured such that a user can manually determine the switching timing.

4. An operational method of an exhaust gas analyzing apparatus for analyzing exhaust gas, the apparatus including a first filter flow path provided with a first filter for passing the exhaust gas therethrough and a first sensor for detecting clogging of the first filter, a second filter flow path provided with a second filter for passing the exhaust gas therethrough and a second sensor for detecting clogging of the second filter, an exhaust gas analyzing part for analyzing combustion byproduct components contained in the exhaust gas passing through the first or second filters, a flow path switching mechanism for selectively passing the exhaust gas to the first or second filter flow paths, a pulse purge mechanism provided in each of the first and second filter flow paths, the pulse purge mechanism for supplying purge gas to each of the first and second filters in a pulsed manner, a first filter heating mechanism for heating the first filter, and a second filter heating mechanism for heating the second filter, the operational method comprising:
in the case where an output value of one of the first and second sensors corresponding to one of the first and second filter flow paths through which the flow path switching mechanism is passing the exhaust gas falls outside a predetermined range, causing the flow path switching mechanism to stop passing the exhaust gas through the one of the first and second filter flow paths and to start passing the exhaust gas through the other of the first and second filter flow paths,
in the case where the flow path switching mechanism stops passing the exhaust gas through the one of the first and second filter flow paths and starts passing the exhaust gas through the other of the first and second filter flow paths, causing the pulse purge mechanism to supply the purge gas to one of the first and second filters corresponding to the one of the first and second filter flow paths in a pulsed manner, and
causing a corresponding one of the first and second filter heater mechanisms to heat the other of the first and second filters at least just before the switching mechanism stops passing the exhaust gas through the one of the first and second filter flow paths and starts passing the exhaust gas through the other of the first and second filter flow paths.

Assignees

• Horiba Ltd

Inventors

• Miyai Masaru
• Yoshimura Tomoshi
• Ito Manabu

Classifications

• G01N1/2252

  in a vehicle exhaust · CPC title

• B01D46/0058 Primary

  Operations & Transport · mapped topic

• G01N1/2247 Primary

  Sampling from a flowing stream of gas · CPC title

• B01D46/90 Primary

  Devices for taking out of action one or more units of multi-unit filters, e.g. for regeneration or maintenance · CPC title

• G01M15/102

  by monitoring exhaust gases · CPC title