Particulate Matter Sensor with Helical Coil Reheating
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Solution Overview
Problem
Existing particulate matter sensors in internal combustion engines face challenges in reliability and operability, particularly with soot emissions from incomplete combustion, as they struggle to accurately monitor and manage particulate emissions effectively.
Innovation Solution
The development of a particulate matter sensor with reheating capabilities to sublimate carbonaceous deposits and a dielectric coating, coupled with a diesel particulate filter, which can detect localized failures and operate within the exhaust stream of a turbine-compressor arrangement, utilizing a probe with a conductive helical coil and a sensor housing for improved detection and classification of particulate matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particulate matter sensors are used to monitor exhaust characteristics, then emission monitoring capability is provided, but reliability and operability deteriorate due to soot accumulation from incomplete combustion
Solution Approach 1:
The patent applies parameter changes by heating the sensor to elevated temperatures (e.g., above 600°C) to alter the physical state of carbonaceous deposits, transforming them from adherent soot layers into sublimable or combustible forms that can be removed, thereby restoring sensor reliability
Solution Approach 2:
The patent utilizes phase transitions by heating the sensor to cause sublimation of carbonaceous deposits directly from solid to gas phase, or to ignite and combust them, thereby eliminating the harmful soot accumulation that degrades sensor performance
2Reliability
If sensor heating is applied to remove carbonaceous deposits, then sensor reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by applying heating cycles rather than continuous heating - the sensor is heated to remove deposits, then allowed to cool, and this cycle repeats only when deposit accumulation is detected, thereby reducing overall energy consumption while maintaining sensor reliability
Solution Approach 2:
The patent uses feedback by monitoring sensor performance parameters (such as signal drift or resistance changes) to detect when carbonaceous deposits have accumulated to a level that affects operation, and only then initiating the energy-consuming heating process to remove them, optimizing the balance between reliability and energy use
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
Enhances the reliability and operability of particulate matter sensors by effectively driving off carbonaceous material, annealing the sensor with a dielectric coating, and detecting localized failures in diesel particulate filters, leading to improved monitoring and management of exhaust characteristics.
Implementation Method 1
a probe with a conductive helical coil... driving off carbonaceous material, annealing the sensor with a dielectric coating
Implementation Method 2
reheating capabilities to sublimate carbonaceous deposits
Data Source
AI summary
Sensor apparatus includes a housing, a probe mounted to the housing, the probe including an elongate first part and a helical coil second part conductively coupled to each in series with first and second terminals at opposite ends thereof, the probe to be inserted into an exhaust stream in an exhaust corridor; and a circuit coupled to the first and second terminals of the sensor probe, to selectively operate the probe as a temperature sensor in a first mode and as a PM sensor in a second mode.