Diesel NOx Sensor Accuracy via Age-Based Gain Correction
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Solution Overview
Problem
Diesel NOx sensors experience a loss of sensitivity over time due to fouling of their catalytic material, leading to inaccurate emissions readings and a need for frequent replacements, which is costly and time-consuming.
Innovation Solution
A system and method that estimates the degree of sensor error based on age and applies a gain correction factor to provide more accurate emissions measurements, compensating for the sensor's aging and extending its useful life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the sensor is used over time, then the sensor can continuously monitor emissions, but the sensor accuracy deteriorates due to fouling of catalytic material
Solution Approach 1:
The patent applies parameter changes by adjusting the sensor reading based on sensor age. A correction factor is applied to the sensor output signal to compensate for sensitivity loss due to fouling. The correction factor varies as a function of sensor age, effectively changing the measurement parameter to maintain accuracy throughout the sensor's service life.
2Measurement precision
If the sensor is replaced frequently to maintain accuracy, then measurement precision is maintained, but replacement cost and time increase
Solution Approach 1:
The system performs self-service by automatically compensating for sensor aging through software-based correction factors. Instead of requiring physical replacement to maintain accuracy, the system self-adjusts the measurements based on accumulated sensor age data, extending the effective service life without sacrificing precision.
3Measurement precision
If the sensor is replaced frequently to maintain accuracy, then measurement precision is maintained, but replacement cost increases
Solution Approach 1:
The system performs self-service by automatically compensating for sensor aging through software-based correction factors. Instead of requiring physical replacement to maintain accuracy, the system self-adjusts the measurements based on accumulated sensor age data, extending the effective service life without sacrificing precision.
Data Source
AI summary
A method and system for improving sensor accuracy of diesel emissions is disclosed. The method and system change the sensor reading as a function of sensor age to provide a more accurate measure of the diesel emissions. By estimating the degree of sensor error and then providing a gain correction factor as a function of sensor age, a more accurate measure of the diesel emissions is provided.