公开(公告)号：US20250149661A1

公开(公告)日：2025-05-08

申请号：US18500366

申请日：2023-11-02

Applicant: GM Global Technology Operations LLC

Inventor： Andrew C. Baughman ,  Shubham Gupta ,  Rajeev M. Ramanan ,  Xiumei Guo

IPC: H01M10/42

Abstract: A power distribution system includes a battery having multiple power cell groups. Each power cell group includes at least two power cells and a state of charge monitoring sensor. A controller is connected to each state of charge monitoring sensor. The controller is configured to run a process causing the processor to detect a slow self-discharge in at least one power cell group by monitoring a cell balancing metric for each power cell group and generating a set of accumulated balance metric values. The set of accumulated balancing metric values includes an accumulated balancing metric value corresponding to each power cell group in the plurality of power cell groups. The process identifies a reference value and a difference between the reference value and the cell balancing metric of each power cell with a cell balancing metric lower than the reference value and comparing the difference to a threshold.

公开(公告)号：US10975746B1

公开(公告)日：2021-04-13

申请号：US16711637

申请日：2019-12-12

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Scott R. Jeffrey ,  Rajeev M. Ramanan ,  Jhansi Basani

IPC: F01N3/00 ,  F01N3/18 ,  F01N11/00 ,  F01N9/00 ,  F02D41/14

Abstract: A driver circuit drives a heater associated with a sensor in an exhaust system of a vehicle at a duty cycle. A feedback circuit generates a feedback signal indicating a temperature of the sensor. A ramp circuit outputs a first ramping set point indicating a first rate at which the temperature of the sensor is to be changed over a first time period after an engine of the vehicle is turned on, and a second ramping set point indicating a second rate at which the temperature of the sensor is to be changed after the first time period until the temperature of the sensor reaches a predetermined temperature. An error circuit generates first and second error signals based on the feedback signal and the first and second ramping set points. A controller controls the duty cycle of the driver circuit to drive the heater based on one or more gains.