Efficient Scheduling of Heterogeneous Messages in the FlexRay Dynamic Segment.

Area of Science:

• Automotive Engineering
• Communication Systems
• Real-time Systems

Background:

• Automotive intelligent driving technologies drive demand for high-performance in-vehicle networks.
• FlexRay offers superior bandwidth, low latency, and high speed compared to LIN and CAN.
• Existing protocols struggle to meet the increasing demands of modern automotive systems.

Purpose of the Study:

• To develop a novel heterogeneous message scheduling algorithm (DHSA) for the dynamic segment of FlexRay bus systems.
• To enhance the scheduling efficiency and real-time performance of FlexRay communication.
• To address the flexible bandwidth needs of advanced automotive networks.

Main Methods:

• Development of a novel heterogeneous message scheduling algorithm (DHSA).
• Implementation of flexible timeslot and priority configuration for event-triggered and low-priority messages.
• Utilizing CANoe.FlexRay simulation tool for experimental platform construction and comparative simulations.

Main Results:

• The proposed DHSA achieved 96.6% bandwidth utilization, a 13.4% increase over the Earliest Deadline First (EDF) algorithm.
• The fastest message response time was reduced by 50% compared to the EDF algorithm.
• Demonstrated significant improvements in system real-time performance and determinism.

Conclusions:

• The DHSA effectively reduces message transmission latency in FlexRay bus networks.
• The algorithm enhances overall communication efficiency and determinism for automotive systems.
• DHSA represents a significant advancement for in-vehicle network performance in intelligent driving applications.