Vehicle signal encapsulation method for automobile CAN message number optimization
A network message and signal encapsulation technology, applied in the direction of bus network, comprehensive factory control, comprehensive factory control, etc., can solve the problems affecting the real-time characteristics of the system, waste of CAN message data fields, etc., and achieve the effect of ensuring the real-time performance of the system
Active Publication Date: 2014-06-04
WUHAN UNIV OF TECH
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Problems solved by technology
The structure of the CAN message set and the selection of priority determine the response time of the CAN message, which in turn affects the real-time characteristics of the system
[0004] At present, the vehicle signal encapsulation of CAN network messages of automobiles mostly adopts the SAE J1939 protocol, because it fully defines the data field of the CAN message, resulting in the waste of the data field of the CAN message when there is no vehicle signal encapsulated
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[0023] The invention relates to a vehicle signal encapsulation method oriented to the optimization of the number of automobile CAN network messages, and the method comprises the following steps:
[0024] First, set the vehicle signal characteristics in: is the vehicle signal generation period; is the vehicle signal deadline; It is the length of the vehicle signal, the unit is bit, and it is less than or equal to the maximum length of the data field of the CAN message. CAN message characteristics (T, D, L, DL, P), where: T is the CAN message generation cycle; D is the CAN message deadline; L is the CAN message length, the unit is bit; DL is the CAN message The length of the encapsulated vehicle signal, the unit is bit; P is the priority of the CAN message, the smaller the P, the higher the priority of the CAN message.
[0025] Then, follow the steps below:
[0026] Step 1: On each ECU, sort the vehicle signals in descending order according to their length, and the sort...
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The invention discloses a vehicle signal encapsulation method for automobile CAN message number optimization and aims to provide a vehicle signal encapsulation method which enables the automobile CAN message number to be minimum and meet the requirements of real-time performance. According to the method, vehicle signals are ordered in a descending sequence according to lengths, on the basis of the heuristic optimization method, the vehicle signals are encapsulated into CAN messages, the CAN message priorities are distributed according to the deadline monotonic method, and the schedulability of CAN message sets are analyzed on the basis of the worst response time; if the CAN message sets cannot be scheduled, the CAN message with the worst response time and the minimum deadline difference value is found out from the CAN messages which cannot be scheduled, and a vehicle signal with the strictest deadline in the CAN message is encapsulated into a new CAN message so as to prolong the deadline of the original CAN; the steps are repeated until the CAN message sets can be scheduled or no CAN message can be decomposed. The vehicle signal encapsulation method has the advantages of achieving automobile CAN message number optimization, guaranteeing the real-time performance of a system, and providing a novel method for designing automobile CAN application layer protocols.
Description
technical field [0001] The invention relates to the processing of vehicle signal data in an automobile ECU, in particular to a vehicle signal encapsulation method for optimizing the number of automobile CAN network messages, belonging to the field of automobile electronics. Background technique [0002] With the improvement of people's requirements for automobile power, safety and comfort, automobile ECU (electronic control unit) and electronic control devices are also increasing. They are not simply connected to the load equipment, but more to exchange information with peripheral equipment and other ECUs and electronic control devices, and issue control commands through complex control decision-making calculations. In order to improve the utilization rate of vehicle signals, a large number of vehicle signals are required to be exchanged and shared among different automotive ECUs. The vehicle network technology realizes the real-time control of each ECU of the vehicle. Amon...
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IPC IPC(8): H04L29/08H04L12/40G05B19/418
CPCY02P90/02
Inventor 胡剑李刚炎胥军牛子孺
Owner WUHAN UNIV OF TECH