Time Offsets for Scheduling Tasks in Multicore ECUs

As vehicles added many functions, the number and complexity of the controllers are increasing. Because of the complexity of software increasing, the CPU load on a single core based controller reaches its limits. To overcome the limitations of the single-core-based controller, a multicore based controller has been introduced. One of the problems encountered when converting software from a single-core-based controller to a multicore-based controller's software is scheduling. This paper proposes an algorithm for generating offset considering the period, execution time, and priority of controller software's internal tasks. This algorithm's offset allows you to reduce the maximum load on the controller among the measured loads every specific period. This period equals the period of task with the highest CPU load. We simulated the HMC engine electronic control unit (ECU) software with the Timing Architects Tool Suite (TA) tool. And using Hardware In the Loop Simulation (HILS), the offset was applied to the ECU of the HMC. Also, we verify the reduction of peak load among the loads measured every specific period that is the same as the task's period with the highest CPU load by offsets generated.