我已经使用Python CAN库编写了一个Python脚本，该库以1秒的速率记录收到的CAN消息，持续5分钟，然后将所有消息记录到文件中并退出。计算机有一个连接到CAN总线的CAN模块。(总线上的另一个设备是发动机(我使用SocketCAN接口与它通信。
这台计算机连接的测试引擎系统正在以250kb的波特率发送大约114条消息。我预计每1秒会看到114条消息记录在文件中，但我看到的却是大约一半。(~65条信息(
有没有可能发动机的ECU设置为500kb波特率，这就是为什么我没有得到我期望的计数？我认为如果波特率不匹配，就不会有通信，但我无法物理访问系统，因为我通过OTA更新远程发送脚本，而不是自己运行。(设备是无头的，但设置为在启动时运行脚本(我只看到生成的日志文件。
以下是python代码：
(注意，我有代码将接收到的消息解析为包含的信号，但我没有在这里包含此代码，因为它发生在最后，并且不相关(
class logging:
def __init__(self):
#Dictionary to hold received CAN messages
self.message_Dict = {}
#List to hold queued dictionaries
self.message_Queue = []
#A "filters" object is also created here, but I did not include it
#I have verified the filters are correct on my test system
def main(self):
#Record the current time
currentTime = datetime.datetime.now()
#Record the overall start time
startTime = datetime.datetime.now()
#Record the iteration start time
lastIterationStartTime = currentTime
#Create the CanBus that will be used to send and receive CAN msgs from the MCU
canbus = can.interfaces.socketcan.SocketcanBus(channel='can0', bitrate=250000)
#These filters are setup correctly, because all the messages come through
#on my test system, but I did not include them here
canbus.set_filters(self.Filters)
# Creating Listener filters and notifier
listener = can.Listener()
#Main loop
while 1:
#create a variable to hold received data
msg2 = canbus.recv()
#Record the current time
currentTime = datetime.datetime.now()
#If a valid message is detected
if(msg2 != None):
if(len(msg2.data) > 0):
try:
#Save the message data into a queue (will be processed later)
self.message_Dict[msg2.arbitration_id] = msg2.data
except:
print("Error in storing CAN message")
#If 1 second has passed since the last iteration,
#add the dictionary to a new spot in the queue
if((currentTime - lastIterationStartTime) >= datetime.timedelta(seconds=1)):
#Add the dictionary with messages into the queue for later processing
messageDict_Copy = self.message_Dict.copy()
self.message_Queue.append(messageDict_Copy)
print("Number of messages in dictionary: " + str(len(self.message_Dict)) + "
Number of reports in queue: " + str(len(self.message_Queue)))
#Clear the dictionary for new messages for every iteration
self.message_Dict.clear()
#Record the reset time
lastIterationStartTime = datetime.datetime.now()
#Once 5 minutes of data has been recorded, write to the file
if((currentTime - startTime) > datetime.timedelta(minutes=5)):
#Here is where I write the data to a file. This is too long to include
#Clear the queue
self.message_Queue = []
#Clear the dictionary for new messages for every iteration
self.message_Dict.clear()
#When the script is run, execute the Main method
if __name__ == '__main__':
mainClass = logging()
mainClass.main()
我感谢你的任何想法或意见。谢谢
根据我的经验，大多数发动机的ECU通常使用250kb，但最新的ECU使用500kb。我建议你也试试这两种。
此外，这些信息只有在发送后才会出现在公交车上，这看起来很傻，但例如一辆卡车，如果你不踩油门，那么提及油门的信息就不会出现。因此，也许您需要检查是否所有组件都在按预期使用。can-utils的库有一个"can-siffer"，它也可以帮助您。
我建议你用"can-utils"来帮助你。它是一个强大的分析工具。
你有没有试着把包绕起来？也许也可以帮助找到另一个。