System for magnetic self test
First Claim
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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Accused Products
Abstract
The disclosure provides a system for magnetic self test. The system includes an electronic control unit (ECU) including a controller. Only one sensor is electrically coupled to the ECU, wherein the sensor includes 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. The system further includes a WOC stimulus element provided in the ECU or the sensor to drive the WOC 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.
13 Citations
19 Claims
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1. A system for magnetic self test, comprising:
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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, and wherein the controller is configured to trigger the test pattern based on one of enabling or disabling a feed forward loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for magnetic self test, comprising:
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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 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 an integrated energy storage device, wherein the energy storage device is powered by an external supply and electrically coupled to the WOC stimulus element provided in the sensor to avoid high current consumption peaks of the sensor during the magnetic self test. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification