Method for Determining a Master Time Signal, Vehicle, and System

Patent metadata

Field	Value
Publication number	US-2016357159-A1
Application number	US-201615241429-A
Country	US
Kind code	A1
Filing date	Aug 19, 2016
Priority date	Feb 20, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

A method is provided for determining a master time signal, in particular in a vehicle. The method includes the acts of: a) receiving at least one first server time signal from a first time server; b) receiving at least one second server time signal from a second time server; c) comparing the first server time signal with the second server time signal in order to determine at least one first time difference; d) storing the first time difference; e) determining an availability of the first server time signal and/or of the second server time signal; f) using the stored first time difference to determine the master time signal at least if at least one of the server time signals is not available.

First claim

What is claimed is:

1 . A method for determining a master time signal in a vehicle, the method comprising the acts of:
a) receiving at least one first server time signal from a first time server; b) receiving at least one second server time signal from a second time server, c) comparing the first server time signal with the second server time signal to determine at least one first time difference; d) storing the first time difference; e) determining an availability of the first server time signal and/or the second server time signal; f) using the stored first time difference to determine the master time signal at least when at least one of the server time signals is not available.

2 . The method according to claim 1 , further comprising the act of:
g) storing the master time signal and/or at least one of the server time signals in a memory.

3 . The method according to claim 2 , wherein the master time signal and/or the at least one server time signal are stored in an encrypted form.

4 . The method according to claim 2 , further comprising the act of:
transmitting the master time signal to at least one control device of the vehicle.

5 . The method according to claim 4 , wherein acts a) to h) are repeated periodically or upon being triggered.

6 . The method according to claim 4 , wherein acts a) to f) are repeated periodically or upon being triggered.

7 . The method according to claim 1 , further comprising the acts of:
assigning weights to the first time server and the second time server; and using the assigned weights to determine the master time signal, wherein the assigned weights are stored in a memory.

8 . The method according to claim 7 , wherein the assigned weights are periodically or dynamically determined and stored in the memory.

9 . The method according to claim 7 , further comprising the act of:
checking a respective weight of a respective time server when a manipulation attempt, a time leap and/or a transmission failure is determined on the respective time server.

10 . The method according to claim 1 , further comprising the act of:
receiving the first server time signal and/or the second server time signal from a mobile terminal device, a navigation system, a vehicle clock, a radio and/or a back-end.

11 . The method according to claim 10 , further comprising the act of:
performing a calibration in which a server time signal is received from the back-end and is defined as the master time signal.

12 . The method according to claim 11 , wherein:
in performing the calibration, the master time signal is compared with the first server time signal and/or the second server time signal and weights assigned to the first time server and/or the second time server are determined as a function of a determined time difference relative to the master time signal.

13 . A vehicle, comprising:
a bus system configured to communicate with one or more control devices of the vehicle; a memory; a master time signal unit that determines a master time signal, the master time signal unit being configured to:
receive a first server time signal from a first time server,
receive a second server time signal from a second time server,
compare the first server time signal with the second server time signal to determine a first time difference and to store the first time difference,
determine an availability of the first server time signal and/or the second server time signal, and
use the stored first time difference to determine the master time signal at least when one of the first or second server time signals is not available,
wherein the master time signal, the first server time signal, the second server time signal and/or the first time difference is stored in the memory.

14 . The vehicle according to claim 13 , further comprising a memory in which a weight or weights of the first time server and/or the second time server are stored.

15 . The vehicle according to claim 13 , wherein
the first time server or the second time server is a navigation system, a vehicle clock, a radio or a back-end.

16 . A system, comprising:
one or more mobile terminal devices, a vehicle, the vehicle comprising: a bus system configured to communicate with one or more control devices of the vehicle; a memory; a master time signal unit that determines a master time signal, the master time signal unit being configured to:
receive a first server time signal from a first time server,
receive a second server time signal from a second time server,
compare the first server time signal with the second server time signal to determine a first time difference and to store the first time difference,
determine an availability of the first server time signal and/or the second server time signal, and
use the stored first time difference to determine the master time signal at least when one of the first or second server time signals is not available,
wherein the master time signal, the first server time signal, the second server time signal and/or the first time difference is stored in the memory;
wherein the first time server and/or the second time server are formed by a respective mobile terminal device.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Abo El-Fotouh Mohamed

Classifications

• H04J3/0658

  Clock or time synchronisation among packet nodes · CPC title

• H04J3/0685

  Clock or time synchronisation in a node; Intranode synchronisation · CPC title

• G04G5/00

  Setting, i.e. correcting or changing, the time-indication (radio-controlled time-pieces G04R) · CPC title

• G04R20/00 Primary

  Setting the time according to the time information carried or implied by the radio signal · CPC title

• H04J3/0635 Primary

  Clock or time synchronisation in a network (timer in protocols H04L69/28) · CPC title