US Patent 8452481 Vehicle information recording apparatus, vehicle information communication system and vehicle information communication method

A GW device for relaying data sent and received between a plurality of ECUs mounted in a vehicle stores data sent from the respective ECUs in a database and then timely sends the data. The database is stored in a time series in association with time information, and copies of database at a plurality of time points are sent to a central device at predetermined time intervals, or at the time of detection of occurrence of a problem.