Outlet Sampling System for Exhaust Gas Measurement
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Solution Overview
Problem
Existing exhaust gas aftertreatment systems face challenges in accurately measuring exhaust gas properties at the outlet due to sensor protrusion into the exhaust gas flow, leading to decreased measurement accuracy and increased sensor failure rates.
Innovation Solution
The system incorporates an outlet sampling system with a sampling bowl and sampling ring, which routes exhaust gas to an outlet sensor without exposing it directly to the exhaust gas flow, thereby protecting the sensor from high temperatures and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor protrudes into the exhaust gas flow to measure exhaust gas properties, then the measurement can be performed, but the measurement accuracy decreases and sensor failure rate increases
Solution Approach 1:
A sampling probe is introduced as an intermediary component between the exhaust gas flow and the sensor. The probe extends into the exhaust gas flow to采集 gas samples, while the sensor remains protected inside the housing. This mediator transfers exhaust gas properties to the sensor without exposing the sensor directly to the harsh exhaust environment, thereby maintaining measurement accuracy while reducing sensor failure rate
Solution Approach 2:
The sensor is extracted from the exhaust gas flow environment and placed inside a protected housing. Only the sampling probe extends into the exhaust gas, separating the sensor from direct exposure to high-temperature and high-corrosion exhaust conditions while still enabling measurement through the sampled gas
2Ease of operation
If the sensor protrudes into the exhaust gas flow, then exhaust gas can be measured, but the sensor is exposed to high temperatures causing increased failure rate
Solution Approach 1:
The sampling probe serves as a mediator that allows the sensor to indirectly measure exhaust gas properties without direct exposure to harmful high temperatures. The probe collects gas samples and delivers them to the sensor, which remains in a protected, cooler environment inside the housing
Solution Approach 2:
The sensor is extracted from the high-temperature exhaust gas environment and relocated to a protected housing. This separation removes the sensor from harmful thermal exposure while maintaining the ability to measure exhaust gas properties through the sampling probe system
Data Source
AI summary
An exhaust gas aftertreatment system includes: an outlet housing body; an outlet sampling system including: a sampling bowl cooperating with the outlet housing body to define a sampling bowl cavity; and a sampling ring coupled to the sampling bowl and defining a sampling ring cavity, the sampling ring defining a plurality of sampling ring inlet apertures configured to receive a portion of exhaust gas from within the outlet housing body, the sampling ring configured to provide the portion of exhaust gas to the sampling ring cavity, the sampling ring cavity in exhaust gas providing communication with the sampling bowl.