US 12,276,739 B2
Vehicle-mounted controller and method for issuing absolute time of vehicle and vehicle
Hao Chen, Beijing (CN); Yikui Dong, Beijing (CN); and Daqian Deng, Beijing (CN)
Assigned to XIAOMI EV TECHNOLOGY CO. LTD., Beijing (CN)
Filed by Xiaomi EV Technology Co., Ltd., Beijing (CN)
Filed on Oct. 27, 2022, as Appl. No. 17/974,854.
Claims priority of application No. 202211014653.6 (CN), filed on Aug. 23, 2022.
Prior Publication US 2024/0069217 A1, Feb. 29, 2024
Int. Cl. G01S 19/51 (2010.01); H04L 12/40 (2006.01)
CPC G01S 19/51 (2013.01) [H04L 12/40 (2013.01); H04L 2012/40215 (2013.01); H04L 2012/40273 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A vehicle-mounted controller for issuing absolute time of a vehicle, comprising:
a Global Navigation Satellite System (GNSS) module;
an Micro-processor Unit (MPU) connected to the GNSS module via a first rigid line and a first serial port line; and
an Micro-controller Unit (MCU) connected to the MPU via a second rigid line and a second serial port line;
the GNSS module configured to: transmit a pulse signal to the MPU via the first rigid line, and transmit recommended positioning information to the MPU via the first serial port line at a moment when a change occurs in high and low levels of the pulse signal;
wherein the MPU configured to:
determine first absolute time according to first reception time when the pulse signal is received, second reception time when the recommended positioning information is received, and the recommended positioning information,
broadcast the first absolute time to an Ethernet network for absolute time synchronization of a first vehicle-mounted device connected to the Ethernet network; and
wherein the MCU configured to:
determine second absolute time according to third reception time when the pulse signal is received, fourth reception time when the first absolute time is received, and the recommended positioning information, and
broadcast the second absolute time to a Controller Area Network (CAN) bus for the absolute time synchronization of a second vehicle-mounted device connected to the CAN bus.