Control-schedule co-design for fast stabilization in real time systems facing repeated reconfigurations

Mayank, Jaishree; Mondal, Arijit; Sarkar, Arnab

doi:10.1007/s10617-019-09221-6

Cited by 1 publication

(1 citation statement)

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“…In [16], each real-time task was divided into a mandatory part and an optional part, and optimal reward-based scheduling was applied to the tasks. In [17], branch and bound-based techniques were proposed for determining optimal schedules under different restrictions on the adaptability of execution rates for the tasks. However, the performance of the system is considered to be directly proportional to the time taken to stabilize all functionalities.…”

Section: Introductionmentioning

confidence: 99%

Scheduling Period Selection Based on Stability Analysis for Engagement Control Task of Automatic Clutches

Zhao

Chen

et al. 2021

Applied Sciences

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The clutch engagement process involves three phases known as open, slipping, and locked and takes a few seconds. The engagement control program runs in an embedded control unit, in which discretization may induce oscillation and even instability in the powertrain due to an improper scheduling period for the engagement control task. To properly select the scheduling period, a methodology for control–scheduling co-design during clutch engagement is proposed. Considering the transition of the friction state from slipping to being locked, the co-design framework consists of two steps. In the first step, a stability analysis is conducted for the slipping phase based on a linearized system model enveloping the driving and driven part of the clutch, feed-forward and feedback control loop together with a zero-order signal hold element. The critical period is determined according to pole locations, and factors influencing the critical period are investigated. In the second step, real-time hardware-in-the-loop experiments are carried out to inspect the dynamic response concerning the friction state transition. A sub-boundary within the stable region is found to guarantee the control performance to satisfy the engineering requirements. In general, the vehicle jerk and clutch frictional loss increase with the increase in the scheduling period. When the scheduling period is shorter than the critical period, the rate of increase is mild. However, once the scheduling period exceeds the critical period, the rate of increase becomes very high.

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Section: Introductionmentioning

confidence: 99%