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Robust system control method with short execution deadlines

A technology of execution time and control system, applied in the direction of program control, adaptive control, program control design, etc., can solve the problem of not allowing the optimal use of CPU resources, and achieve the effect of saving computing power and maintaining system stability

Inactive Publication Date: 2013-03-20
AIRBUS OPERATIONS (SAS)
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Furthermore, the WCET approach does not allow optimal use of CPU resources since most of the time tasks are well able to output results before the WCET deadline

Method used

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  • Robust system control method with short execution deadlines
  • Robust system control method with short execution deadlines
  • Robust system control method with short execution deadlines

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Embodiment Construction

[0058] The inventors have found that at present, automatic control system theory has reached a level of confidence in the robustness analysis that allows for the tolerance of missed deadlines. The inventors have also found that the prevalent WCET approach is overly cautious in most applications, especially safety-critical applications. In the following, a method of controlling an automated system having a time slot smaller than WCET allocated to control task execution and tolerant of missed time limits will be described. It also shows the stability and security of the system that can be guaranteed.

[0059] As follows, for n-dimensional state vector X and non-negative delay h, X t Denotes such that for all θ ∈ [-h, 0] there is X t (θ) = function of X(t-θ). The function X t The set of is denoted as K h . Set R + , R nxn and S n Represent positive scalar set, nxn matrix set and R respectively nxn The set of symmetric matrices. The superscript 'T' means matrix transpos...

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Abstract

A method of controlling a system comprising the following steps: - launching a task, said task being associated with a worst case execution time; and - monitoring the end of the task after a time slot allocated to the execution of the task; wherein said time slot is shorter than said worst case execution time.

Description

technical field [0001] This invention relates to the control of critical automated systems. The invention applies to robust autonomous systems, such as avionics systems, where stability is a critical issue. Background technique [0002] Safety-critical products, such as avionics, are often developed according to strict safety specifications. These safety specifications include the determination and prediction of the timing behavior of the system. Typically, the overall development approach is based on the separation of control design and implementation concerns. [0003] During control design, important issues are maintaining a constant sampling rate with equidistant samples and no jitter, and with negligible, or fixed, known delay. Also, according to real-time scheduling theory, it focuses primarily on dimensioning resources to meet time constraints (or equivalently, on scheduling analysis for a given resource). [0004] Typically, during runtime, each resource of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04G01D1/10
CPCG06F9/4887G06F11/30G06F11/008G06F9/50G06F9/48G05B19/0426
Inventor P·安德里亚尼艾纳A·塞雷D·西蒙
Owner AIRBUS OPERATIONS (SAS)
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