On-board local area network switchable gateway, on-board local area network monitoring method and on-board local area network system

Abstract

The embodiment of the invention provides an on-board local area network switchable gateway, an on-board local area network monitoring method and an on-board local area network system. A circuit switching device in the switchable gateway is respectively connected with a diagnostic bus in the on-board local area network and each communication bus, and switching between the diagnostic bus and the communication bus can be carried out. A communication device in the switchable gateway receives a monitoring instruction transmitted by an external monitoring device via an external communication interface, and the monitoring instruction is transmitted to the circuit switching device. Through arranging the switchable gateway in the on-board local area network, a switching function between the diagnostic bus and other communication buses is added in the switchable gateway, the monitoring device such as a diagnosis instrument or a message monitoring device can be in butt-joint with the diagnostic bus and the communication bus via the external communication interface and the switchable gateway, time-sharing of diagnosis and monitoring of the on-board local area network is realized, and the on-board local area network can be effectively monitored.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted local area networks, in particular to a switchable gateway of the vehicle-mounted local area network, a monitoring method and a vehicle-mounted local area network system. Background technique [0002] Vehicle-mounted local area network is a controller area network designed to realize information sharing and functional cooperation between various electronic control systems inside the vehicle. The communication bus that makes up the vehicle-mounted local area network is generally CAN (Controller Area Network, controller area network) bus, LIN (Local Interconnect Network, local area interconnection network) bus, K_line bus and Flexray bus, etc. In addition, in order to realize the communication between the various communication buses, a switchable gateway is usually added to the vehicle local area network. The switchable gateway also undertakes the routing function of diagnostic frames betwee...

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Problems solved by technology

[0005] A schematic diagram of a connection mode between an OBD interface and a vehicle-mounted local area network in the prior art is shown in figure 1 as shown, figure 1 It shows that only one diagnostic bus on the switchable gateway is connected to the OBD interface. After the diagnostic instrument is connected to the OBD interface, the diagnostic message routing function of the switchable gateway can be used to realize the diagnosis of each ECU on each communication bus. (Electronic Control Unit, electronic control unit) diagnosis, but the monitoring / recording of network messages cannot be performed by connecting to the OBD interface

[0006] The disadvantage of the connection method between the OBD interface and the vehicle-mounted local area network in the above-mentioned prior art is: when the engineers of the car factory need to monitor / record network messages to analyze faults, the monitoring equipment cannot directly monitor the network messages through the OBD interface / Record

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