Predictive compensation for communication outages in networked control systems

Henriksson, Erik; Johansson, Karl Henrik

doi:10.1109/cdc.2008.4739306

Cited by 20 publications

(29 citation statements)

References 13 publications

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“…The above discussions indicate that the underlying plant dynamics is given by (6) in the nominal mode, (16) in the skip mode, and (19) in the abort mode. Suppose, in general, starting at k, there are i instants of nominals, followed by j skip instants (each with a length of 2h), followed by r instants of aborts, for = 1 : p, with…”

Section: B Implementation Of the Overrun Frameworkmentioning

confidence: 96%

Co-Design of Arbitrated Network Control Systems With Overrun Strategies

Soudbakhsh

Phan

Annaswamy

et al. 2018

IEEE Trans. Control Netw. Syst.

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Abstract-This paper addresses co-design of platform and control of multiple control applications in a network control system. Limited and shared resources among control and noncontrol applications introduce delays in transmitted messages. These delays in turn can degrade system performance and cause instabilities. In this paper, we propose an overrun framework together with a co-design to achieve both optimal control performance and efficient resource utilization. The starting point for this framework is an Arbitrated Network Control System (ANCS) approach, where flexibility and transparency in the network are utilized to arbitrate control messages. Using a two-parameter model for delays experienced by control messages that classifies them as nominal, medium, and large, we propose a controller that switches between nominal, skip and abort strategies. An automata-theoretic technique is introduced to derive analytical bounds on the abort and skip rates. A co-design algorithm is proposed to optimize the selection of the overrun parameters. A case study is presented that demonstrates the ANCS approach, the overrun framework and the overall co-design. I. INTRODUCTION AND RELATED WORKEmbedded computing systems (ECS) are ubiquitous in a wide range of applications including transportation, energy, and healthcare. Design of ECS faces several challenges, especially in the context of high performance, due to strict requirements such as safety, real-time deadlines, and minimum power consumption. These systems typically consist of several control and non-control applications in which their components communicate via shared resources. The presence of several applications with different priorities and limitations on the processing elements introduces resource contention. Specifically, messages can be occasionally delayed, arriving too late to be useful. It is therefore highly desirable to address the design of ECS that directly accommodates the presence of imperfect message transmissions, provides efficient resource utilization, and meets stringent performance specifications. This paper presents a co-design of implementation platform and control so as to result in efficient resource utilization and desired real-time control performance in the presence of overruns in messages when they do not meet their deadlines.Existing research in co-design of control and implementation platform in the presence of non-ideal message transmissions can be categorized in two parts: i) Designing controllers to achieve desired performance and ii) Designing communication protocols to achieve efficient resource utilization. The former consists of procedures for the estimation of worst-case delays of messages and design of controllers that are robust to such delays. This approach however can be pessimistic and

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Section: B Implementation Of the Overrun Frameworkmentioning

confidence: 96%

Co-Design of Arbitrated Network Control Systems With Overrun Strategies

Soudbakhsh

Phan

Annaswamy

et al. 2018

IEEE Trans. Control Netw. Syst.

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“…It turns out that it is then possible to use that solution to bound the second term, and thus to bound the error criterion (13).…”

Section: A Hankel Approximation Ofmentioning

confidence: 99%

“…Predictive control has been extensively used in various networked control settings, e.g., [11], [12]. The POC was introduced in [13], where we showed that a fairly simple filter significantly could improve the performance of control systems under communication outages.…”

Section: Introductionmentioning

confidence: 99%

Reduced-order predictive outage compensators for networked systems

Henriksson

Johansson

2009

Proceedings of the 48h IEEE Conference on Decision and Control (CDC) Held Jointly With 2009 28th Chinese Control Conference

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Abstract-Control systems utilizing wireless sensor and actuator networks can be severely affected by the properties of the wireless links. Radio fading and interference may cause communication outage of several samples in situations when the radio environment is noisy and low transmission power is desirable. We propose a method to compensate for outages by introducing a predictive outage compensator (POC), which is a filter to be implemented at the receiver sides of networked control systems and that generates artificial samples during the outage. The main contribution of the paper is to show that a POC can be derived based on a Kalman filter formulation and that it is possible to achieve good performance with a loworder implementation based on Hankel norm approximation. Tradeoffs between achievable closed-loop performance, outage length, and POC order are discussed. The results are illustrated on a simulated example of a multiple-tank process.

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“…The presented strategy assumes an upper bound on the consecutive faults and zero sensor-to-actuator delay. A more recent approach to handle dropped signals in a networked control system is the predictive outage control presented in [4]. This approach is based on predictive form and was implemented using an additional computational block next to the actuator to compute new input signals in case no new messages arrived.…”

Section: A Related Workmentioning

confidence: 99%

Fault-tolerant control synthesis and verification of distributed embedded systems

Kauer¹,

Soudbakhsh

Goswami

et al. 2014

Design, Automation &Amp; Test in Europe Conference &Amp; Exhibition (DATE), 2014

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Abstract-We deal with synthesis of distributed embedded control systems closed over a faulty or severely constrained communication network. Such overloaded communication networks are common in cost-sensitive domains such as automotive. Design of such systems aims to meet all deadlines following the traditional notion of schedulability. In this work, we aim to exploit robustness of the controller and propose a novel implementation approach to achieve a tighter design. Toward this, we answer two research questions: (i) given a distributed architecture, how to characterize and formally verify the bound on deadline misses, (ii) given such a bound, how to design a controller such that desired stability and Quality of Control (QoC) requirements are met. We address question (i) by modeling a distributed embedded architecture as a network of Event Count Automata (ECA), and subsequently introducing and formally verifying a property formulation with reduced complexity. We address question (ii) by introducing a novel fault-tolerant control strategy which adjusts the control input at runtime based on the occurrence of fault or drop. We show that QoC under faulty communication improves significantly using the proposed fault-tolerant strategy.

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Predictive compensation for communication outages in networked control systems

Cited by 20 publications

References 13 publications

Co-Design of Arbitrated Network Control Systems With Overrun Strategies

Co-Design of Arbitrated Network Control Systems With Overrun Strategies

Reduced-order predictive outage compensators for networked systems

Fault-tolerant control synthesis and verification of distributed embedded systems

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