Particle Detection Sensor Heater Control for Oxygen-Dependent Burn
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Solution Overview
Problem
Particle detection systems used in gasoline engines face challenges in removing adhering particles due to the lack of oxygen in exhaust gas, leading to reduced detection performance and unnecessary energy consumption when a heater is constantly energized.
Innovation Solution
A particle detection system that includes a sensor main body with a heater portion and period detection means to identify burnable periods with sufficient oxygen, allowing the heater to be energized only during these times to burn off adhering particles, thereby maintaining detection performance while minimizing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heater is constantly energized to burn adhering particles, then particle detection performance is maintained, but energy consumption increases unnecessarily
Solution Approach 1:
The heater is energized periodically based on the detected burnable periods rather than continuously. The control unit activates the heater only during time periods when oxygen concentration exceeds the threshold, creating a periodic on-off pattern that maintains particle combustion capability while avoiding continuous energy consumption.
Solution Approach 2:
The system uses oxygen concentration detection as feedback to control heater operation. The detection unit continuously monitors oxygen levels, and the control unit adjusts heater energization based on this feedback signal, creating a closed-loop control system that optimizes energy usage while maintaining detection performance.
2Loss of energy
If the heater is energized when oxygen is absent, then energy is wasted, but particle removal is ineffective
Solution Approach 1:
The system performs preliminary detection of oxygen concentration before activating the heater. By detecting the presence of oxygen in advance and only then energizing the heater, the system ensures that particle burning conditions are favorable before investing energy, preventing wasted energy consumption on ineffective heating operations.
Solution Approach 2:
The system uses the natural oxygen content in the exhaust gas to determine when heating is effective. Rather than continuously heating regardless of conditions, the system allows the exhaust gas composition itself to dictate when energy investment in heating will be productive, making the heating process self-regulating based on environmental conditions.
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
The system effectively removes adhering particles during burnable periods, maintaining detection performance and reducing energy consumption by only energizing the heater when oxygen is present in the exhaust gas.
Implementation Method 1
heater energization control means for energizing the heater portion during the burnable period so as to heat at least a portion of the electrification section to a temperature at which the particles adhering to the electrification section burn
Implementation Method 2
an ion source for producing ions through corona discharge and which electrifies particles (soot or the like) contained in exhaust gas using the produced ions
Data Source
AI summary
A particle detection system includes a sensor main body having an electrification section for electrifying particles contained in a gas under measurement so as to produce electrified particles, and detects the particles contained in the gas under measurement by using the electrified particles. The sensor main body has a heater portion which generates heat upon energization so as to heat at least a portion of the electrification section. The particle detection system detects a burnable period (for example, fuel cut period) during which the gas under measurement contains oxygen for burning particles adhering to the electrification section, and energizes the heater portion during the burnable period so as to heat at least a portion of the electrification section to a temperature at which the adhering particles burn.