Vehicle-mounted data acquisition device capable of extending ports and data acquisition method thereof

Abstract

The invention relates to a vehicle-mounted data acquisition device capable of extending ports and a data acquisition method. Two HDMI interfaces that are an upper chain port and a lower chain port arearranged on each vehicle-mounted acquisition instrument; a number of data acquisition instruments sequentially connect the lower chain ports and the upper chain ports of the adjacent data acquisitioninstruments through HDMI cables, and thus the number of data acquisition instruments are connected in series; multiple acquisition instruments automatically determine that a device that is not connected to the upper chain port is main equipment and other devices are slave equipment; the main equipment sends configuration information to the slave equipment through the HDMI interfaces and initiatestime synchronization instructions to the slave equipment; each slave equipment performs time synchronization based on the time of the main equipment; and after receiving a data acquisition start instruction, the main equipment sends the instruction to the slave equipment, the main and slave equipment synchronously acquires data, and the main equipment merges the received data of all slave equipment with the own acquired data and synchronously stores the merged data to a file. The scheme of the invention is simple in structure, and data acquisition and later data playback analysis can be performed conveniently and quickly.

Description

technical field [0001] The invention belongs to the field of automobile testing, and in particular relates to a vehicle-mounted data collection device with an expandable port and a data collection method thereof. Background technique [0002] The vehicle-mounted data acquisition instrument is used to collect CAN interface data, video data, sound data, etc. on the vehicle. Restricted by the number of interfaces of the data acquisition instrument, the mainstream vehicle-mounted data acquisition instrument has no more than 4 CAN interfaces, no more than 4 video interfaces, and 1 audio interface. With the development of automobile intelligence, in some cases, the number of interfaces of a data acquisition instrument can no longer meet the acquisition requirements. However, if multiple acquisition instruments are used to collect data separately, the data stored by each instrument is independent. Not only does there exist the problem of out-of-synchronization of data storage, but...

AI Technical Summary

Problems solved by technology

With the development of automobile intelligence, in some cases, the number of interfaces of a data acquisition instrument can no longer meet the acquisition requirements

However, if multiple acquisition instruments are used to collect data separately, the data stored by each instrument is independent. Not only does there exist the problem of out-of-sync data storage, but also when multiple instruments are stored at the same time, multiple data files will be generated, which will exist in later data playback analysis. difficulty

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