Method and apparatus for monitoring number density of aerosol particles
US-12146809-B2 · Nov 19, 2024 · US
Particulate Matter Sensor
US2018073971A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018073971-A1 |
| Application number | US-201615263894-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 13, 2016 |
| Priority date | Sep 13, 2016 |
| Publication date | Mar 15, 2018 |
| Grant date | — |
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Abstract
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A particulate matter sensor assembly including a resistance sensor and a resonance sensor. Each one of the resistance sensor and the resonance sensor is configured to measure particulate matter present in engine exhaust.
First claim
Opening claim text (preview).
What is claimed is: 1 . A particulate matter sensor assembly comprising: a resistance sensor; and a resonance sensor; wherein each one of the resistance sensor and the resonance sensor is configured to measure particulate matter present in engine exhaust. 2 . The particulate matter sensor assembly of claim 1 , wherein the resonance sensor is a piezoelectric sensor. 3 . The particulate matter sensor assembly of claim 1 , wherein the resonance sensor is an acoustic wave sensor. 4 . The particulate matter sensor assembly of claim 1 , further comprising an insulator insulating the resonance sensor from the resistance sensor. 5 . The particulate matter sensor assembly of claim 1 , further comprising a heat shield insulating the resonance sensor from the resistance sensor. 6 . The particulate matter sensor assembly of claim 1 , further comprising a ceramic insulator insulating the resonance sensor from the resistance sensor. 7 . The particulate matter sensor assembly of claim 1 , further comprising a slot between the resistance sensor and the resonance sensor configured to thermally insulate the resistance sensor from the resonance sensor. 8 . The particulate matter sensor assembly of claim 1 , further comprising a heater configured to heat the resistance sensor to regenerate the resistance sensor. 9 . The particulate matter sensor assembly of claim 1 , further comprising a sensor probe including a probe tip; wherein the probe tip includes the resistance sensor and the resonance sensor. 10 . The particulate matter sensor assembly of claim 1 , further comprising a sensor probe including a probe tip; wherein the probe tip includes the resistance sensor, a heater proximate to the resistance sensor to heat the resistance sensor, a resonance sensor, and an insulator insulating the resonance sensor from the heater. 11 . The particulate matter sensor assembly of claim 1 , wherein the resonance sensor is a backup sensor configured to operate when the resistance sensor is not functioning. 12 . An exhaust treatment system for an engine, the system comprising: a particulate matter filter configured to filter particulate matter in exhaust produced by the engine; an exhaust outlet; and a particulate matter sensor configured to be arranged in the exhaust outlet to measure particulate matter present in the engine exhaust with both a resistance sensor and a resonance sensor. 13 . The system of claim 12 , wherein the resonance sensor is a piezoelectric sensor. 14 . The system of claim 12 , wherein the resonance sensor is an acoustic wave sensor. 15 . The system of claim 12 , further comprising an insulator insulating the resonance sensor from the resistance sensor. 16 . The system of claim 12 , further comprising a heat shield insulating the resonance sensor from the resistance sensor. 17 . The system of claim 12 , further comprising a ceramic insulator insulating the resonance sensor from the resistance sensor. 18 . The system of claim 12 , further comprising a heater configured to heat the resistance sensor to regenerate the resistance sensor. 19 . The system of claim 12 , further comprising a sensor probe including a probe tip; wherein the probe tip includes the resistance sensor and the resonance sensor. 20 . The system of claim 12 , further comprising a sensor probe including a probe tip; wherein the probe tip includes the resistance sensor, a heater proximate to the resistance sensor to heat the resistance sensor, a resonance sensor, and an insulator insulating the resonance sensor from the heater.
Assignees
Inventors
Classifications
Smoke, combustion gases · CPC title
Resonance or resonant frequency · CPC title
with stored values, e.g. threshold values · CPC title
Piezoelectric probes · CPC title
by measuring frequency or resonance of acoustic waves · CPC title
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Frequently asked questions
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- What does patent US2018073971A1 cover?
- A particulate matter sensor assembly including a resistance sensor and a resonance sensor. Each one of the resistance sensor and the resonance sensor is configured to measure particulate matter present in engine exhaust.
- Who is the assignee on this patent?
- Denso Int America Inc
- What technology area does this patent fall under?
- Primary CPC classification G01N15/0656. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Mar 15 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).