Exhaust Gas Flame Detection via Pressure Sensing
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Solution Overview
Problem
Existing exhaust gas systems for motor vehicles face challenges in accurately and robustly sensing flame formation in exhaust gas burners, as temperature sensors react slowly and are critically positioned, leading to potential operational errors.
Innovation Solution
The implementation of a pressure sensor system in the exhaust gas system, including a pressure sensor in the supply air path and an additional sensor in the exhaust gas path, allows for accurate and latency-free detection of flame formation, with optional optical, temperature, and acoustic verification methods, ensuring robust monitoring and protection from heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are used to detect flame formation in the exhaust gas burner, then the temperature measurement can be obtained, but the sensor reacts slowly and requires critical positioning close to the combustion chamber
Solution Approach 1:
The patent replaces temperature sensors with optical sensors (such as charge-coupled devices or photodiodes) to detect flame formation. The optical sensors detect light emission from the flame directly, providing immediate detection without the thermal inertia and latency associated with temperature sensors. This substitution of detection mechanism eliminates the response time delay while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces an intermediary approach by using light as the medium to detect flame formation. Instead of directly measuring temperature changes that require physical contact and thermal equilibrium, the system uses optical signals (light emission from the flame) as an intermediary indicator of flame presence and characteristics, enabling remote and instantaneous detection.
2Measurement precision
If temperature sensors are positioned close to the combustion chamber for accurate flame detection, then measurement accuracy improves, but the sensor is exposed to excessive heat and potential damage
Solution Approach 1:
The patent replaces heat-sensitive temperature sensors with optical sensors that detect light emission from the flame. Optical sensors can be positioned at a distance from the combustion chamber and are not affected by high temperatures in the same way thermal sensors are. This substitution eliminates the harmful heat exposure issue while maintaining the ability to accurately detect flame formation through light detection.
Solution Approach 2:
The patent transitions from thermal dimension detection to optical dimension detection. By detecting flame formation through light emission rather than temperature measurement, the system operates in a different physical dimension that is less susceptible to thermal damage. This allows the sensor to be positioned further away from the heat source while still accurately detecting flame characteristics.
3Reliability
If the exhaust gas system uses complex temperature monitoring to ensure proper operation, then operational reliability can be maintained, but the system complexity and sensor placement criticality increase
Solution Approach 1:
The patent replaces complex temperature monitoring systems with simpler optical detection systems. The optical sensors directly detect flame presence and characteristics without requiring complex thermal modeling or multiple sensor arrays. This substitution reduces system complexity while maintaining or improving reliability through more direct and immediate flame detection capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables precise and timely detection of flame formation without latency, improving operational reliability and reducing the criticality of sensor placement, thus enhancing the efficiency and accuracy of exhaust gas system operations.
Implementation Method 1
the pressure sensor being arranged in the supply air path and in particular outside a combustion chamber of the exhaust gas burner
Implementation Method 2
A fuel-air mixture is ignited in the exhaust gas burners and the hot exhaust gas from the combustion of the fuel-air mixture is conveyed to the points to be heated
Data Source
AI summary
An exhaust gas system for a motor vehicle includes an exhaust gas burner and a pressure sensor for sensing flame formation in the exhaust gas burner.