Management method and device for vehicle-mounted CAN partial networking

Abstract

The invention provides a management method and device for vehicle-mounted CAN partial networking. The method comprises the steps that a first network management message is generated; an active sleep indicating bit in the first network management message and a node sleep indicating bit corresponding to a sleepy node are set; the first network management message which carries a target address and is processed by setting is sent in a broadcasting mode; a second network management message which carries a sleepy node address and is returned according to the first network management message is received; whether parameter bits, corresponding to the active sleep indicating bit and the node sleep indicating bit, in the second network management message are set or not is detected; if it is detected that the parameter bits are set, the first network management message is not sent any more in a broadcasting mode, and the sleepy node is made to enter the sleep mode after a preset time period. By means of the scheme, the problem that as the network node offline reason (whether the network nodes are passively offline due to faults or are actively offline for energy conservation) can not be recognized, misinformation of a node loss fault is caused is effectively prevented, and normal and orderly communication of the CAN partial networking is ensured.

Description

technical field [0001] The invention relates to the technical field of automotive electronic control, in particular to a management method and device for a vehicle-mounted CAN local network. Background technique [0002] As governments around the world continue to require reductions in vehicle carbon dioxide emissions, OEMs are increasingly concerned about how to create more environmentally friendly vehicles. When it comes to environmental protection of vehicles, many people first think of electric vehicles, but in fact, traditional vehicles also have the possibility of improving energy efficiency. The goal of the global government is to reduce the total carbon dioxide emissions. However, most of the power supply in many developing countries comes from thermal power plants. Therefore, the electric vehicles used in these countries actually only transfer carbon dioxide emissions from cars to thermal power plants. reduce. In view of this, OEMs began to implement CAN Partial N...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a management method and device for a vehicle-mounted CAN local network, so as to solve the problem in the prior art that the node is lost due to the inability to identify whether the network node is passively offline due to a fault or actively offline due to energy saving.

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