Quantification and optimization of environmental stability of Tyre Pressure Sensors (TPMS) using physico-chemical methods

摘要

The interaction of Tyre Pressure Monitoring Systems (TPMS) with chemicals mainly involves the interaction of the chemicals with the seal present between the electronic pressure sensing element and the outside world. A model has been elaborated to describe the interaction of liquids and vapours with the sealing element. The model uses a parametric description of the interacting materials, the seal and the chemical penetration, by taking into account polar and a-polar contributions. It was shown that the interaction, i.e. the swelling of the seal, can be monitored by the output of the pressure sensor. Experimental data confirm the model and allow description of the seal in physico-chemical parameters. Using these parameters a prediction of the performance/failure can be made for new material combinations. The fitness of the method is discussed in the process of optimizing the seal, yielding a sensor with improved environmental stability.