TY - JOUR

T1 - A Soft Piezo Mechanical Hydraulic Actuator with its Liquid Stiffness Identification and its Control

AU - Mercorelli, Paolo

AU - Werner, Nils

AU - Behre, Leander

N1 - The paper was presented at the 7th IFAC Symposium on Mechatronic Systems & 15th Mechatronics Forum International Conference in Loughborough (UK). After that, the paper was published in the Journal IFAC-PapersOnline.

PY - 2016

Y1 - 2016

N2 - The CO2 emissions of an internal combustion engine are directly proportional to the fuel consumption. The use of the fully variable valve control to reach the most efficient gas exchange of the engine is an option to reduce CO2 emissions. This paper deals with an alternative actuator solution based on an aggregate device consisting of a piezoelectric, mechanical and hydraulic actuation. The aggregate device realises a soft actuator. In mechanical systems hard actuators are more and more replaced by soft ones which present some advantages in terms of efficiency. Nevertheless, problems of control, because of a more complex dynamics of the actuator due to a higher order of the mathematical model of the actuator, arise. The softness of the actuator is realised by using two strategic mechanical springs and a hydraulic part which works as a displacement ratio. It is known that in piezo actuators, big forces but small displacement can be available. The hydraulic displacement ratio is used for a possible ”soft solution” to adapt force and displacement. The conception of the actuator and control simulation results are shown.

AB - The CO2 emissions of an internal combustion engine are directly proportional to the fuel consumption. The use of the fully variable valve control to reach the most efficient gas exchange of the engine is an option to reduce CO2 emissions. This paper deals with an alternative actuator solution based on an aggregate device consisting of a piezoelectric, mechanical and hydraulic actuation. The aggregate device realises a soft actuator. In mechanical systems hard actuators are more and more replaced by soft ones which present some advantages in terms of efficiency. Nevertheless, problems of control, because of a more complex dynamics of the actuator due to a higher order of the mathematical model of the actuator, arise. The softness of the actuator is realised by using two strategic mechanical springs and a hydraulic part which works as a displacement ratio. It is known that in piezo actuators, big forces but small displacement can be available. The hydraulic displacement ratio is used for a possible ”soft solution” to adapt force and displacement. The conception of the actuator and control simulation results are shown.

KW - Engineering

KW - Actuators

KW - control

KW - electro-hydraulic systems

KW - engines

KW - modelling

KW - variable valve timing control

UR - http://www.scopus.com/inward/record.url?scp=84995624290&partnerID=8YFLogxK

U2 - 10.1016/j.ifacol.2016.10.582

DO - 10.1016/j.ifacol.2016.10.582

M3 - Conference article in journal

AN - SCOPUS:84995624290

VL - 49

SP - 367

EP - 372

JO - IFAC-PapersOnLine

JF - IFAC-PapersOnLine

SN - 2405-8971

IS - 21

ER -