Exhaust gas analyzer
First Claim
1. An exhaust gas analyzer comprising a plurality of sensor units disposed at a plurality of locations along an exhaust path via which exhaust gas is discharged from an internal combustion engine,each one of the plurality of sensor units comprising:
- an irradiation unit that applies a laser light in a direction perpendicular to a direction of extension of the exhaust path at a position of the exhaust path where the irradiation unit is disposed, a photoreceiving unit for receiving the laser light emitted by the irradiation unit that has been transmitted through the exhaust gas, a plate-shaped main body, and a through-hole formed in the main body allowing passage of the exhaust gas, wherein the through-hole is formed in a shape matched with a cross-sectional shape of the exhaust path,wherein for each one of the plurality of sensor units, the concentration or temperature of an exhaust gas component is measured on the basis of the laser light received by the photoreceiving unit for analyzing the exhaust gas,wherein for each one of the plurality of sensor units, the laser light is shone by the irradiation unit into the through-hole and is received by the photoreceiving unit across the exhaust path, andwherein for each one of the plurality of sensor units, the plate-shaped main body is sandwiched in-between a pair of flanges extending from components along the exhaust path,wherein the exhaust gas analyzer further comprises a controller configured to emit, for each one of the plurality of sensor units, the laser light into the through hole via the irradiation unit, the controller comprising a plurality of laser diodes, each laser diode being connected to one of a plurality of first demultiplexers, each one of the plurality of first demultiplexers being connected to a plurality of second demultiplexers, the plurality of second demultiplexers being configured to separate the laser light for each one of the plurality of sensor units into signal light and measurement light, and the controller further comprising a plurality of multiplexers, each one of the plurality of multiplexers being configured to receive and multiplex either the signal light or the measurement light.
1 Assignment
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Accused Products
Abstract
An exhaust gas analyzer capable of real-time analysis of the concentration, temperature, and the like of an exhaust gas component in a cross-section of an exhaust path in a spot-wise manner reduces analysis cost. An exhaust gas analyzer (10) comprises sensor units (11) to (14) disposed along the exhaust path, which comprises an exhaust manifold (3) for the engine (2) discharging exhaust gas, an exhaust tube (4), a first catalyst device (5), a second catalyst device (6), a muffler (7), and an exhaust pipe (8). Each sensor unit includes an optical fiber (25) for irradiating the exhaust gas with laser light, and a detector (26) for receiving the laser light emitted by the optical fiber that has been transmitted through the exhaust gas. Based on the laser light received by the detector, the condition of an exhaust gas component, such as its concentration, temperature, and the like, is measured for the analysis of the exhaust gas. The sensor unit has a through-hole (21) allowing the passage of exhaust gas that is formed in a shape matched with a cross-sectional shape of the exhaust path. The infrared laser light R is emitted via the optical fiber (25) into the through-hole (21), travels across the exhaust path, and is then received by the detector (26).
40 Citations
13 Claims
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1. An exhaust gas analyzer comprising a plurality of sensor units disposed at a plurality of locations along an exhaust path via which exhaust gas is discharged from an internal combustion engine,
each one of the plurality of sensor units comprising: -
an irradiation unit that applies a laser light in a direction perpendicular to a direction of extension of the exhaust path at a position of the exhaust path where the irradiation unit is disposed, a photoreceiving unit for receiving the laser light emitted by the irradiation unit that has been transmitted through the exhaust gas, a plate-shaped main body, and a through-hole formed in the main body allowing passage of the exhaust gas, wherein the through-hole is formed in a shape matched with a cross-sectional shape of the exhaust path, wherein for each one of the plurality of sensor units, the concentration or temperature of an exhaust gas component is measured on the basis of the laser light received by the photoreceiving unit for analyzing the exhaust gas, wherein for each one of the plurality of sensor units, the laser light is shone by the irradiation unit into the through-hole and is received by the photoreceiving unit across the exhaust path, and wherein for each one of the plurality of sensor units, the plate-shaped main body is sandwiched in-between a pair of flanges extending from components along the exhaust path, wherein the exhaust gas analyzer further comprises a controller configured to emit, for each one of the plurality of sensor units, the laser light into the through hole via the irradiation unit, the controller comprising a plurality of laser diodes, each laser diode being connected to one of a plurality of first demultiplexers, each one of the plurality of first demultiplexers being connected to a plurality of second demultiplexers, the plurality of second demultiplexers being configured to separate the laser light for each one of the plurality of sensor units into signal light and measurement light, and the controller further comprising a plurality of multiplexers, each one of the plurality of multiplexers being configured to receive and multiplex either the signal light or the measurement light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification