Study and Simulation of Scheduling Strategies on Vehicle Operating Safety State Monitoring System

Since Vehicle Operation Safety State Monitoring System (VOSMS) requires high level of real-time, task execution time should be minimized through scheduling strategy optimization. In this paper, according to the analysis on functional requirement and system architecture, we present four real-time performance evaluation indexes including system average update rate, system worst update rate, data gain response time and parameter calculation response time. As well, three optimized scheduling strategies from different aspects are put forward. They are update rules, hierarchical scheduling and collateral execution. Numerical results are yielded in Uppaal. The simulation shows that, by use of optimized scheduling policies, system average update rate is increased by 68.35%; system worst update rate is increased by 21.71%; the performance of data gain response time is increased by28.85%; the performance of parameter calculation response time is increased by25%.