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System for magnetic self test

  • US 10,527,701 B2
  • Filed: 10/13/2014
  • Issued: 01/07/2020
  • Est. Priority Date: 10/14/2013
  • Status: Active Grant
First Claim
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1. A system for magnetic self test, comprising:

  • an electronic control unit (ECU) including a controller;

    only one sensor electrically coupled to the ECU, wherein the sensor comprises a sensing element, a signal conditioning element electrically coupled to the sensing element and the controller, and a wire-on-chip (WOC) device disposed next to the sensing element;

    a WOC stimulus element provided in the ECU or the sensor to drive the WOC device based at least in part on a test pattern to create a WOC magnetic field,wherein the system is configured to compare an expected sensor output signal that is caused by the WOC magnetic field with an actual sensor output signal by the controller or an additional signal assessment element in the sensor to identify whether the sensor is still functioning correctly,wherein the sensor further comprises one or more integrated capacitors parallel connected with the WOC device, wherein the inductor of the WOC device and the integrated capacitor form a resonant circuit that is excited by an internal driver device, the enabling input of which is connected to the WOC stimulus element, andwherein the controller is configured to trigger the test pattern based on one of enabling or disabling a feed forward loop.

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