Method and system for diagnostic measurement of motor vehicle restraint system squib loop resistance

摘要

A method of measuring squib loop resistance including non-linear elements in a restraint control module is disclosed by the present invention. The squib loop resistance is comprised of both linear and non-linear elements. The non-linear elements are linearized into resistive components about the bias points used to make the squib loop resistance measurement. The calculation of the linear squib loop resistance is provided by comparing the complete squib loop resistance and the linearized value of the non-linear elements.

主权项

1. A method of diagnostic measurement of a squib loop in a motor vehicle including at least one linear element and at least one non-linear element, comprising the steps of:
storing a resistance of the non-linear element into a memory; applying a bias current through the squib loop including the linear element and the non-linear element; measuring the voltage across the squib loop including the linear element and the non-linear element; calculating the resistance of the squib loop including the linear element and the non-linear element at the bias current and measuring voltage across the squib loop; and calculating the squib loop resistance without the non-linear element by comparing the resistance of the squib loop including the linear element and the non-linear element with the resistance of the non-linear element from the memory.