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10. A Sufficient Response Time Analysis Considering Angular Phases Between Rate-Dependent Tasks.

Author

Feld, Timo and Slomka, Frank

Subjects
*TASKS, *ANGULAR velocity
Abstract

In automotive embedded real-time systems, e.g., the engine control unit, tasks are activated whenever the engine arrives at a specific angular position. In consequence the frequency of activation changes with the speed of the engine. Additionally, the execution times and deadlines may also depend on the engine speed. In recently published works analytical methods for tasks with this rate-dependent behavior were introduced. Though those methods do not consider angular phases between tasks. For instance, in a typical engine control unit one event is displaced a certain angular position after an event of another task. This paper introduces a sufficient analysis, which considers such angular phases. A number of experimental results are reported to compare our method with existing analysis. These illustrate the improvement in terms of precision and runtime. [ABSTRACT FROM AUTHOR]

Published
2019
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11. Exact Interference of Tasks With Variable Rate-Dependent Behavior.

Author

Feld, Timo and Slomka, Frank

Subjects
*COMPUTER control systems of automobile engines, *MULTICORE processors, *COMPUTER vision, *EMBEDDED computer systems, *AUTOMOBILE industry
Abstract

In embedded real-time systems, the schedulability analysis is an important method to verify whether the real-time constraints are satisfied. Especially, engine control systems in the automotive industry are particular challenging regarding their real-time analysis. Some of the tasks of such systems are triggered at predetermined angular values of the crankshaft. Thus, the frequency of activation increases for higher crankshaft rotation speeds. To avoid overloads, these tasks reduce their computational demand for higher rotation speeds. The variable rate-dependent behavior (VRB) task model has been proposed as a means of modeling such rate-dependent behavior. In this paper, we introduce a new method for the exact computation of interference for VRB-tasks. A number of experimental results are reported to validate our approach and compare it with existing analysis. These experimental results illustrate that our method outperforms previous results in terms of precision and runtime. [ABSTRACT FROM PUBLISHER]

Published
2018
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