Integrable Inductance Measurement System for Wire Harness Health Check in Electrical Vehicle

Le résumé fourni par la source

During their lifetime, wire harness can be modified due to external environment or unintentional technical action. It is therefore possible to see changes in the overall system behavior thus compromising system safety and reliability. There is, consequently diagnosis and maintenance issues. In modern cars, the electrical wire harness verification during manufacturing and afterwards maintenance and diagnosis become crucial due to increase of complexity and functional safety requirement. Estimating the line impedance (resistance and inductance) is beneficial to validate the wire harness during manufacturing and also to evaluate its health state over the vehicle lifetime. Integrate a very low wire inductance measurement system in one chip with reasonable area is a strong challenge. Because, a very small variation of below 0.1µH over a wide range of line inductance is desired. Then, measurement sensitivity requirement is very high. This paper describes a semi-conductor integrable method for measuring the wire inductance and detect a relative variation of wire length of about 10cm over 6m.

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