一种自带控制器的氧传感器
By combining a porous ceramic filter cap and a resistance heating wire, the problems of impurity blockage and carbon buildup removal in oxygen sensors under complex operating conditions are solved, thus maintaining the cleanliness of the sensing element, improving the response speed, and extending the service life of the sensor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU BOCAI GUIJIN NEW MATERIAL CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-17
AI Technical Summary
Existing oxygen sensors are unable to effectively block submicron-sized carbon particles and oil mist under complex operating conditions, leading to the rapid formation of carbon deposits, which affects the response speed and stability of the sensing element. Furthermore, existing heating elements lack carbon removal capabilities, resulting in low efficiency.
The system employs a porous ceramic filter cap combined with a resistance heating wire and a PCB controller. The porous ceramic filter cap has a small pore size and axial through-holes to block impurities from entering, while the resistance heating wire is periodically heated by the PCB controller to actively remove carbon deposits.
It effectively blocks tiny impurities, prolongs the cleanliness of the sensing element, actively removes carbon deposits, improves the accuracy and stability of oxygen concentration detection, shortens response lag time, and extends sensor lifespan.
Smart Images
Figure CN224518641U_ABST
Abstract
Claims
1. A controller-on-board oxygen sensor, comprising: The sensor body (1) is characterized in that it further includes a porous ceramic filter cap (2) disposed at the sensing element detection end of the sensor body (1), and a carbon removal unit disposed on the side of the porous ceramic filter cap (2). The porous ceramic filter cap (2) is a cylindrical hollow structure with an open bottom and a closed top in a hemispherical shape. The carbon removal unit includes: a resistance heating wire (3) wrapped around the outer wall of the porous ceramic filter cap (2), a control box (31) fixed at the bottom of the sensor body (1), and a PCB controller (32) and a battery (33) installed inside the control box (31). The resistance heating wire (3) and the battery (33) are both electrically connected to the PCB controller (32), which is used to control the resistance heating wire (3) to perform periodic heating.
2. The oxygen sensor with a controller according to claim 1, characterized by: The porous ceramic filter cap (2) has a pore size of 5-10 μm, a porosity of 40-50%, and an axial through-hole ratio of ≥60%.
3. The oxygen sensor with a built-in controller according to claim 1, characterized by: The inner wall of the porous ceramic filter cap (2) is integrally formed with at least two axial spiral guide ribs (21). The spiral guide ribs (21) are evenly distributed along the circumferential direction of the filter cap and form a spiral airflow channel with the outer wall of the detection end of the sensing element.
4. The oxygen sensor with a built-in controller according to claim 3, characterized by: The cross-sectional shape of the spiral guide rib (21) is one of rectangle, triangle or polygon.
5. The oxygen sensor with a built-in controller according to claim 1, characterized by: The bottom end of the porous ceramic filter cap (2) is provided with an internal thread (22) for threaded connection with the base of the sensing element.
6. An oxygen sensor with an integral controller according to claim 5, wherein: The porous ceramic filter cap (2) has a fluororubber O-ring (23) built into the root of the internal thread (22) for sealing the connection between the porous ceramic filter cap (2) and the sensing element base.
7. The oxygen sensor with a built-in controller according to claim 1, characterized by: The filter cap is fitted with a protective cover (4), and the bottom inner wall of the protective cover (4) is fixed to the bottom outer wall of the porous ceramic filter cap (2).
8. The oxygen sensor with a built-in controller according to claim 1, characterized by: The sensor body (1) is an oxygen sensor of model NP400.
9. The oxygen sensor with a built-in controller according to claim 1, characterized by: The resistance heating wire (3) is wound into a coil structure and fixed at the middle position of the outer wall of the porous ceramic filter cap (2).
10. An oxygen sensor with a built-in controller according to claim 1, characterized in that: The two ends of the resistance heating wire (3) lead out through the wire holes in the outer shell of the sensor body (1) and are electrically connected to the PCB controller (32) through the aviation plug.