Model-Based Network Latency Analysis of Automotive System

Since R2026a

This example shows a latency analysis for a car physical architecture performed using System Composer™ functions.

Network latency is the time delay experienced as data travels from source to destination, influenced by factors such as distance, congestion, and intermediary devices. Analyzing latency involves measuring and diagnosing these delays, enabling targeted optimizations to improve network performance. In this example, network latency between elements is encoded in a stereotyped property called Latency.

To visualize the shortest path network analysis for the car physical architecture model CarPhysicalArchitecture, first define a starting point and ending point. The starting point is the TrunkOpenButton component and the ending point is the TrunkActuator component, representing the time it takes from pressing a button to open the trunk and for the trunk to open. Run the runAnalysis function.

runAnalysis

Total latency is 8

compPath = 28×1 cell
    {'LatencyAnalysis/TrunkOpenButton'       }
    {'LatencyAnalysis/TrunkOpenButton:DO0'   }
    {'LatencyAnalysis/CAN_IO_2:DI4'          }
    {'LatencyAnalysis/CAN_IO_2'              }
    {'LatencyAnalysis/CAN_IO_2:CAN'          }
    {'LatencyAnalysis/CAN Network 2:J3'      }
    {'LatencyAnalysis/CAN Network 2'         }
    {'LatencyAnalysis/CAN Network 2:J0'      }
    {'LatencyAnalysis/BodyECU2:CAN'          }
    {'LatencyAnalysis/BodyECU2'              }
    {'LatencyAnalysis/BodyECU2:Eth0'         }
    {'LatencyAnalysis/Ethernet Switch 2:Eth1'}
    {'LatencyAnalysis/Ethernet Switch 2'     }
    {'LatencyAnalysis/Ethernet Switch 2:Eth0'}
    {'LatencyAnalysis/Ethernet Switch 1:Eth1'}
    {'LatencyAnalysis/Ethernet Switch 1'     }
    {'LatencyAnalysis/Ethernet Switch 1:Eth2'}
    {'LatencyAnalysis/BodyECU1:Eth0'         }
    {'LatencyAnalysis/BodyECU1'              }
    {'LatencyAnalysis/BodyECU1:CAN'          }
    {'LatencyAnalysis/CAN Network 1:J0'      }
    {'LatencyAnalysis/CAN Network 1'         }
    {'LatencyAnalysis/CAN Network 1:J3'      }
    {'LatencyAnalysis/CAN_IO_1:CAN'          }
    {'LatencyAnalysis/CAN_IO_1'              }
    {'LatencyAnalysis/CAN_IO_1:DO0'          }
    {'LatencyAnalysis/TrunkActuator:DI0'     }
    {'LatencyAnalysis/TrunkActuator'         }

The total latency along the path is 8 ms. The network latency graph shows a visual representation of the result that shows the nodes in the shortest path between source and target.