Hysteresis compensation in a piezo-hydraulic actuator using heuristic phase correction of periodic trajectories

The paper deals with a heuristical approach to compensate friction hysteresis in an aggregate actuator which is proposed to be applied in a camless engine system and which consists of piezoelectric, mechanic and hydraulic components. The hydraulic displacement amplifier shows a conspicuous hysteresis effect that appears to be a dead time that depends on the speed of the engine. In general, with high engine speeds, the dead time effect is reduced. The compensation of the hysteresis effect is not model-based since the real time application must run within a very short time. The presented approach consists of an adaptive pre-action on the desired servo piston trajectory which is generated by a feedforward action fed by phase-variable Gaussian curves as desired valve trajectories. Simulations show the effectiveness of the proposed compensating techniques.

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