公开(公告)号：US20160320441A1

公开(公告)日：2016-11-03

申请号：US14837641

申请日：2015-08-27

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xinyu Du ,  Shengbing Jiang ,  Atul Nagose ,  David B. Gumpert ,  Aaron B. Bloom ,  Rod Niner

IPC: G01R31/08 ,  G01R31/02

CPC classification number: G01R31/025 ,  G01R31/007 ,  H04L1/24

Abstract: A method is disclosed for detecting ground faults in a communications system. The method includes measuring a predetermined number of voltage points; determining if the measured voltage points represent recessive or dominant bits; identifying which of the predetermined number of voltage points represent inter-frame bits and which represent frame data bits based on whether the measured voltage points are recessive or dominant; calculating a maximum average voltage for the inter-frame bits; calculating an average frame voltage for all dominant bits within a frame; determining a high average dominant voltage count based on a number of frames for which the average frame voltage is greater than a high voltage threshold; and determining if a ground fault exists based on the average frame voltage and the high average dominant voltage count.

Abstract translation: 公开了一种用于检测通信系统中的接地故障的方法。 该方法包括测量预定数量的电压点; 确定测量的电压点是否表示隐性或显性位; 识别预定数量的电压点中的哪一个代表帧间比特，并且基于所测量的电压点是否为隐性或占优势来表示帧数据比特; 计算帧间比特的最大平均电压; 计算帧内所有显性位的平均帧电压; 基于平均帧电压大于高电压阈值的帧数确定高平均主电压计数; 并且基于平均帧电压和高平均主电压计数来确定是否存在接地故障。

公开(公告)号：US09989575B2

公开(公告)日：2018-06-05

申请号：US14837641

申请日：2015-08-27

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Xinyu Du ,  Shengbing Jiang ,  Atul Nagose ,  David B. Gumpert ,  Aaron B. Bloom ,  Rod Niner

IPC: G01R31/02 ,  H04L1/24 ,  G01R31/00

CPC classification number: G01R31/025 ,  G01R31/007 ,  H04L1/24

Abstract: A method is disclosed for detecting ground faults in a communications system. The method includes measuring a predetermined number of voltage points; determining if the measured voltage points represent recessive or dominant bits; identifying which of the predetermined number of voltage points represent inter-frame bits and which represent frame data bits based on whether the measured voltage points are recessive or dominant; calculating a maximum average voltage for the inter-frame bits; calculating an average frame voltage for all dominant bits within a frame; determining a high average dominant voltage count based on a number of frames for which the average frame voltage is greater than a high voltage threshold; and determining if a ground fault exists based on the average frame voltage and the high average dominant voltage count.

公开(公告)号：US09589394B2

公开(公告)日：2017-03-07

申请号：US14800796

申请日：2015-07-16

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David B. Gumpert

IPC: G07C5/08 ,  G01R35/00 ,  G01R31/00 ,  G01R31/08 ,  G07C5/02

CPC classification number: G07C5/08 ,  G01R31/005 ,  G01R31/088 ,  G07C5/02 ,  G07C5/0816 ,  G07C2205/02

Abstract: Disclosed herein are a system and a related computer-executed method of locating a source of a ground offset in a network of electronic devices interconnected by a communication bus. An exemplary method detects signal voltages on the communication bus that are indicative of a ground offset condition, and saves voltage timestamps for the detected signal voltages such that each detected signal voltage has a respective voltage timestamp. Message timestamps are added to messages on the communication bus, such that each message has a respective message timestamp. The message timestamps are compared against the voltage timestamps to identify at least one of the electronic devices as a ground offset source.

Abstract translation: 这里公开了一种在通过通信总线互连的电子设备的网络中定位接地偏移源的系统和相关的计算机执行方法。 示例性方法检测通信总线上的信号电压，其指示接地偏移条件，并且为检测到的信号电压节省电压时间戳，使得每个检测到的信号电压具有相应的电压时间戳。 消息时间戳被添加到通信总线上的消息，使得每个消息具有相应的消息时间戳。 将消息时间戳与电压时间戳进行比较，以将至少一个电子设备识别为接地偏移源。