Heating Element Thermistor for PM Sensor Regeneration
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Solution Overview
Problem
Conventional particulate matter sensors fail to effectively and efficiently monitor and control the temperature of the heating element during the regeneration process, leading to inadequate soot removal and potential damage from excessive temperatures, and add complexity and cost with the use of additional temperature sensors.
Innovation Solution
The system utilizes the heating element itself as a thermistor to detect temperature, incorporating dynamic exhaust flow information and pulse width modulation to adjust the heating command signal, ensuring steady-state response voltage and maintaining net power delivery, with multiple substrate layers for protection and accurate resistance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is added to monitor the heating element temperature, then temperature control precision is improved, but device complexity and cost increase
Solution Approach 1:
The heating element is designed to function dually as both the heating source and the temperature sensor. The heating element's resistance changes with temperature, and this resistance change is measured to determine temperature, eliminating the need for a separate temperature sensor. This merging of functions resolves the contradiction by improving temperature control precision without increasing device complexity or cost.
Solution Approach 2:
The heating element is given multiple functions: it serves as the primary heating component during regeneration and simultaneously acts as a temperature sensing element through its resistance-temperature characteristic. This multi-functionality approach allows the system to achieve precise temperature monitoring without adding separate sensing components, thereby resolving the technical contradiction between measurement precision and device complexity.
2Productivity
If the heating element temperature is increased to improve soot removal efficiency, then productivity is improved, but the risk of damaging sensor components increases
Solution Approach 1:
The system uses the heating element's resistance changes as feedback to monitor its temperature in real-time. Based on this feedback, the control system adjusts the power supplied to the heating element to maintain optimal regeneration temperature. This feedback mechanism enables high productivity for soot removal while preventing excessive temperatures that could damage sensor components, thus resolving the contradiction between productivity and component safety.
Solution Approach 2:
The system dynamically changes the electrical parameters (voltage, current, power) supplied to the heating element based on the measured resistance changes. By adjusting these parameters in response to temperature conditions, the system can achieve high soot removal efficiency when needed while preventing thermal damage to components, resolving the contradiction between productivity and harmful effects.
3Duration of action of moving object
If the heating element temperature is increased to reduce regeneration time, then duration of action is improved, but the risk of overheating and component damage increases
Solution Approach 1:
The heating element's resistance serves as a feedback indicator of its temperature. The control system continuously monitors this resistance and adjusts the heating power accordingly, enabling rapid regeneration while preventing overheating. This feedback control resolves the contradiction by allowing short regeneration times without excessive temperature increases that could damage components.
Solution Approach 2:
The system dynamically adjusts heating parameters (power, voltage, current) based on real-time resistance measurements to optimize the regeneration process. This parameter control enables the system to achieve fast regeneration times while maintaining temperatures within safe limits, resolving the contradiction between duration of action and temperature control.
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 approach provides precise temperature feedback control, optimizing soot removal efficiency while preventing overheating and reducing system complexity and cost by eliminating the need for additional temperature sensors.
Implementation Method 1
the heating element itself as a thermistor to detect the temperature of the heating element
Implementation Method 2
the heating element may be activated to oxidize the soot and regenerate the sensor
Implementation Method 3
the carbon component of the soot creates a high resistance short between the electrodes, which effectively lowers the resistance
Data Source
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AI summary
The present disclosure relates to a system for regenerating a particulate matter sensor, the system comprising: a particulate matter sensor comprising a sensing element and a heating element; a sensing module configured to detect a soot loading on the sensing element of the particulate matter sensor and generate a regeneration request indicating a desired regeneration temperature; a heating module configured to receive the regeneration request and send a heating command signal to the heating element based on the regeneration request; an electrical resistance module configured to detect an electrical resistance in the heating element and determine an actual temperature of the heating element; and a temperature feedback module configured to modify the heating command signal according to the difference between the desired regeneration temperature and the actual temperature.