Reliability of automotive electronic components under conditions of alternating loads
Authors: Adarchin S.A., Kosushkin V.G., Adarchina E.N.
Published in issue: #7(31)/2014
DOI: 10.18698/2308-6033-2014-7-1316
Category: Engineering | Chapter: Electronic Engineering
Generalized Hooke’s law for a silicon single-crystal sensitive element of pressure sensors of automobile electronics showed that at a tension arising in sensitive elements of sensors under conditions of real operation of car engines, there can be defects in crystal lattice which cause a hysteresis of the device properties. It is established that experimental data on frequency distribution of hysteresis size of the sensors electrophysical parameters can be described by the normal law of distribution of random variables. We offer a mathematical model of hysteresis emergence and change in sensor elastic elements of mikroelektromechanical structures used in automobile electronics. The model was constructed using a method of polynomial regression of experimental data and allows to define reliability of commercially available sensors. It is shown that in order to reduce the magnitude of the temperature hysteresis of the output signal in integrated pressure sensors, it is necessary to eliminate the causes of elastic stresses in their structures.Optimization of sensors technological process (changing technology of holes formation in the glass, upon which the membrane is attached) allowed to reduce the hysteresis sensor output to 0.01 mV instead of 0.07 mV for base technology.
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