Canoe-the second simulation project-xvehicle-1 bus database design (idea)

Catalog

Project description

Purpose of the project

Antecedents feed

Key steps of database design —— summary

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Project description

Simulation Engineering X-Vehicle：

The project includes three ECU：Engine、Door and Display. adopt Control Panel to simulate engine state switching 、 Speed adjustment and door Switch operation , At the same time Display The relevant status is displayed on the panel .

Purpose of the project

Hope that through this project , Yes CANoe To understand the three function blocks of ： Database design 、 Panel design and CAPL.

This article is based on X-Vehicle Engineering understanding  CANoe Bus database design module .

Antecedents feed

From the first simulation project （CANoe- The first simulation project ： Switches and lights （ Ideas ）_lamanchas The blog of -CSDN Blog ） We already know , The main components of simulation engineering ：① Function module ② Signals that transmit messages between functional modules ③ Internal programming of some functional modules .

By defining 、 simulation 、 Realize these three parts , We can get a simulation project .

Concrete ,

• The functional modules mainly include ： Simulation node , Control panel node , Bus .
• The signals responsible for transmitting messages between functional modules mainly include ： message , The signal , environment variable , System variables .
• The programming inside the function module involves CAPL Language .

 （CANoe- The first simulation project ： Switches and lights （ Ideas ）_lamanchas The blog of -CSDN Blog ） The simulation engineering implementation process of is ：

• Bus ： Through the new project , Build a bus based on the bus template
• Simulation node , Control panel node ： Add... Through the toolbar
• The signal ： Add through the database
• Programming ： double-click ECU Conduct CAPL Programming

In this paper , We only design ‘ Network bus database ‘’（ Hereinafter referred to as ‘ database ’） To build the whole simulation project . because , We can understand , All nodes 、 The signal , In the computer, it is always stored in the form of data , That is to say, we can describe the whole simulation system completely through data .

In the bus system of automobile ,ECU Communication between 、 The interaction of information and the relationship between them , Are managed through the bus database . The bus database defines each in the bus system ECU The message to be sent and received , And the specific definition of all bit values of each message .

In practical engineering , Generally, the way of defining database is not used to establish simulation engineering , But like the first simulation project , First, design the vehicle network architecture , The database design is mainly responsible for describing ECU Functional interaction , Generate database design documents . Then, it is disclosed in whole or in part to each ECU supplier , The supplier carries out specific design according to the assigned database design documents .

In some special cases , Will need ECU Supplier according to customer documentation , Design your own database , Add yourself ECU Associated data information . For example, in the early stage of the project ,ECU The supplier cannot get the standard database file from the vehicle factory , In order to ensure the project Development progress of ,ECU The supplier needs to rely on the message matrix （matrix） File create your own database file .

Key steps of database design —— summary

We already know , The key component of simulation engineering is ECU Simulation node ,ECU Control panel node , Bus , Communication signals and ECU Internal encoding . The database can be defined in addition to ECU It can be realized outside the internal code . It can be divided into three parts as a whole ： Bus , Communication nodes , The signal .

The overall steps can be summarized as follows 5 Step ：

1. New project & Bus description ： Create an empty simulation project X-Vehicle, Establish engineering organization folder . 【File——new—— Templates CAN500kBaud 1ch】

2. New database & Bus description ： Database based bus template , Create database .【Tools-CANdb++ Editor——File——CreateDatabase—— Select the bus template according to the function （ This article chooses Vector IL Basic Template.dbc）—— Create a database project XVehicle.dbc】

3. node ： Add a node description to the database .

4. The signal ： Add signals to the database 、 Message description , Set specific attributes of different signal data .

5. After the above steps are completed , The database file design is completed . This database project XVehicle.dbc Import the project we created before X-Vehicle. After import, you can use Simulation——Simulation Setup See the simulation node created in the database .

Please refer to ：https://blog.csdn.net/lamanchas/article/details/122113719