Vehicle-mounted ECU high-precision time synchronization method and device

A time-synchronized, high-precision technology that can be used in time-division multiplexing systems, radio-controlled timers, instruments, etc., and can solve problems such as difficult deployment

Active Publication Date: 2021-05-18
BEIJING JINGWEI HIRAIN TECH CO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Because the time synchronization protocols used in existing solutions all rely on network protocols, there are special requirements for hardware. Difficult to deploy on devices

Method used

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  • Vehicle-mounted ECU high-precision time synchronization method and device
  • Vehicle-mounted ECU high-precision time synchronization method and device
  • Vehicle-mounted ECU high-precision time synchronization method and device

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] First of all, it should be explained that the controller chips involved in the high-precision time synchronization method and device for vehicle-mounted ECUs disclosed in the present invention all have serial ports, and are related to single-ECU multi-chip clusters and multi-ECU situations.

[0055] The embodiment of the invention discloses a high-precision time synchronization method and device for a vehicle-mounted ECU. At least two controller chips to...

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Abstract

The invention discloses a vehicle-mounted ECU high-precision time synchronization method and device. The method comprises the following steps: receiving PPS signals periodically generated and transmitted by a GPS module through a controller chip, switching from a current working state to an interruption state, recording chip time during interruption as first time, receiving a serial port message transmitted by the GPS module again, recording the time when the serial port message is received as second time, and when a time difference between the second time and the first time is within a preset period, analyzing an UTC timestamp from the serial port message, and taking the UTC timestamp as an absolute timestamp corresponding to the chip time. The time of the controller chip is calibrated periodically by utilizing the UTC timestamp, high-precision time synchronization does not depend on a network protocol, the time synchronization of the controller chip in multiple ECUs can be realized by only one GPS module, and the time synchronization method can be deployed in equipment without a network interface or without supporting the network protocol.

Description

technical field [0001] The invention relates to the technical field of automobile ECU time synchronization, and more specifically, relates to a high-precision time synchronization method and device for a vehicle ECU. Background technique [0002] With the development of electronic technology and Internet of Vehicles technology, more and more ECUs (Electronic Control Units) are installed on cars, and the internal structure of each ECU is becoming more and more complex. Many ECUs use multi-core or multi-chip architectures. At the same time, there are more and more communication messages and control commands on the vehicle body network, which are becoming more and more complex. In many application scenarios, such as real vehicle scene reconstruction, automatic driving, etc., it is necessary to consider the sequence of communication messages or the timing relationship between control commands. Realize time synchronization between controller chips. Considering that it is genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04L29/06H04L29/08G04R20/02G04R20/04G04R20/06
CPCH04J3/0685H04L69/22H04L67/12G04R20/02G04R20/04G04R20/06
Inventor 邓冕
Owner BEIJING JINGWEI HIRAIN TECH CO INC
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