US 12,227,168 B2
Accurate error estimation in E-motor sensors
Harshad V. Tadas, Franklin, MA (US)
Assigned to SENSATA TECHNOLOGIES, INC., Attleboro, MA (US)
Filed by SENSATA TECHNOLOGIES, INC., Attleboro, MA (US)
Filed on Mar. 15, 2022, as Appl. No. 17/694,894.
Claims priority of provisional application 63/169,108, filed on Mar. 31, 2021.
Prior Publication US 2022/0314963 A1, Oct. 6, 2022
Int. Cl. B60W 20/40 (2016.01); B60W 50/08 (2020.01); B60W 50/12 (2012.01)
CPC B60W 20/40 (2013.01) [B60W 50/082 (2013.01); B60W 50/12 (2013.01); B60W 2510/081 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus for estimating error in an electric motor position sensor, the apparatus including a computer processor coupled to a computer readable storage medium, the computer readable storage medium including computer program instructions that when executed by the computer processor cause the apparatus to carry out the operations of:
receiving, by an electronic control unit (ECU) for an electric motor during a first state of operation of the electric motor, a first plurality of time samples of a first output signal from a position sensor, the first output signal indicative of a rotational position of the electric motor during the first state;
determining, by the ECU, an estimated error offset for the first plurality of time samples;
storing, by the ECU, the estimated error offset in a memory associated with the ECU;
receiving, by the ECU during a second state of operation of the electric motor, a second plurality of time samples of a second output signal from the position sensor, the second output signal indicative of a rotational position of the electric motor during the second state; wherein the second state of operation is different than the first state of operation;
determining, by the ECU, an estimated error for the second plurality of time samples; and
determining, by the ECU, whether a difference between the estimated error and the stored estimated error offset is greater than a predetermined threshold value.