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Soot sensors for efficient combustion and low emissions - SootSensII

  • Publisert 28.02.2011
Due to the serious health hazard in urban air from nanosized soot particles, legislation is raised to very small allowed emission limits for example for diesel powered heavy duty trucks.

Image of the report's front pageIn this project we developed a soot sensor technology, two patents filed, based on thermophoresis. This   is a force acting on particles located in a temperature gradient, such that a sensor held at lower temperatures than the surrounding exhaust gas will obtain enhanced deposition of submicron particles. The main achievements in the project are:

  • The soot sensors were operated in a two temperature cyclic operation mode of detection and soot burn off in diesel exhausts and functioned according to specification during the New European and World Harmonized Transient Driving Cycles required for proof of concept by vehicle manufacturers
  • A thermos concept for efficient cooling of the sensor surface has been demonstrated
  • Transistor devices are interesting for soot detection
  • Soot has been produced by aerosol technology for testing of sensors in the laboratory and calibration of soot sensors
  • Sensing layers were tested with potential to lower the soot burn off temperature


Future development include

  • Conducting ceramics (MAX materials) contacts in the soot sensors for long term stable cyclic detection/ burn off operation (within FunMat, VINNOVA VINN Excellence center at Linköping University)
  • More investigation of transistor devices for soot detection. The soot particles are charged and hence charging of the gate area in a transistor is interesting as technology (within FunMat, VINNOVA VINN Excellence center at Linköping University)
  • Further development of the soot sensor concept to a general nanoparticle detector (detection of particle size and content) in a project at Oulu University in Finland, where the coordinator started a FiDiPro (Finnish Distinguished Professor) position (at 50%) in 2011




The participating partners in this project were from Sweden: Linköping University (coordinator), Lund University, Volvo Technology Corporation/ AB Volvo, Mandalon Technologies AB, SenSiC AB, from Norway: SINTEF, from Finland: Selmic Oy and from Romania: ”Al. I. Cuza” University of Iasi (UAIC)

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