Parameter Estimation and a Series of Nonlinear Observers for the System Dynamics of a Linear Vapor Compressor

Latham, Joseph; McIntyre, Michael L.; Mohebbi, Mohammad

doi:10.1109/tie.2016.2582728

Cited by 26 publications

(9 citation statements)

References 14 publications

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“…This formulation of can be compared to a maximal admissible error : every operation point [ , ] which presents < can be reached safely (stroke will be maintained to deliver the required flow without the risk of damaging the device by an overshoot). With this performance indicator, we can see that taking into account the variations of the inductance and back emf in the velocity estimator (or observer in the case of [16]) results in an increase of the operation range of the stroke controller.…”

Section: B Sensor-less Control Implementations and Evaluationmentioning

confidence: 99%

“…However, coil current derivative must be computed which is not trivial in a noisy environment. Latham et al [16] present a velocity observer to estimate the that does not rely on computing any time derivative. The resulting position from integrating the estimated velocity [15]- [17] is sensitive to measurement bias that propagates into the velocity estimation which results in drift when integrated.…”

Section: The Implantable Undulating Membrane Pumpmentioning

confidence: 99%

“…As it is possible to directly measure current (with a probe placed inside the power electronics, i.e. outside patient's body), and the electric dynamics is well known, we will rely mostly on Eq (1), ( [16], [18]). This equation can be used to create an estimate of velocity, that can be integrated to the position [15].…”

Section: Position Observer For Sensor-less Controlmentioning

confidence: 99%

“…These observers are different through their first stage. One is the velocity observer developed in [16]. The other the one is designed from Eq (7).…”

Section: B Sensor-less Control Implementations and Evaluationmentioning

confidence: 99%

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Sensorless Nonlinear Stroke Controller for an Implantable, Undulating Membrane Blood Pump

Scheffler

Mechbal

Rébillat

et al. 2019

2019 IEEE 58th Conference on Decision and Control (CDC)

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This paper describes an original methodology to operate a new nonlinear vibrating membrane pump, actuated by a moving magnet actuator without the use of a motion sensor, in the scope of cardiac assistance. A nonlinear mathematical model of the system is established and used to parametrize a nonlinear position observer that uses the coils current as an input and which output is a feedback to a stroke controller. Actuator's parameters are identified by a recursive least square algorithm and direct measurements. Finally, a numerical experiment illustrates the implementation of the algorithm and its possible applications.

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Section: B Sensor-less Control Implementations and Evaluationmentioning

confidence: 99%

Section: The Implantable Undulating Membrane Pumpmentioning

confidence: 99%

Section: Position Observer For Sensor-less Controlmentioning

confidence: 99%

“…These observers are different through their first stage. One is the velocity observer developed in [16]. The other the one is designed from Eq (7).…”

Section: B Sensor-less Control Implementations and Evaluationmentioning

confidence: 99%

See 2 more Smart Citations

Sensorless Nonlinear Stroke Controller for an Implantable, Undulating Membrane Blood Pump

Scheffler

Mechbal

Rébillat

et al. 2019

2019 IEEE 58th Conference on Decision and Control (CDC)

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“…where ℎ ( ) ∈ ℝ is the inverse Laplace transform of ( ). Substituting (25) into (30) a form of the filtered signal ( ) can be written as follows…”

Section: Assumptionmentioning

confidence: 99%

Observation and estimation study for sensorless control of linear vapor compressors.

Latham¹

Self Cite

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Linear vapor compressors have become widely investigated for refrigeration applications due to their high efficiency in comparison to the more common rotary type compressors. However, the nature of the linear compressor adds complexity to the control of these machines. The unconstrained motion of the piston in a linear compressor allows for continuous modulation of the compressor output, but requires knowledge of the mechanical dynamics to effectively control the compressor and prevent collision of the piston with the cylinder head. This control is made more difficult by the highly nonlinear nature of the force of gas compression acting against the piston. As this gas force changes so does the resonant frequency of the system. Efficient control of the compressor requires knowledge and tracking of this resonant frequency in addition to other objectives. Sensorless control of the system is preferred for reliability, ease of production, and cost effectiveness. To this end a series of nonlinear observers and a combination of controllers have been developed for the linear vapor compressor.

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Implementation and Evaluation of a Sensorless, Nonlinear Stroke Controller for an Implementable, Undulating Membrane Blood Pump

Scheffler¹,

Mechbal²,

Monteiro³

et al. 2020

IFAC-PapersOnLine

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Parameter Estimation and a Series of Nonlinear Observers for the System Dynamics of a Linear Vapor Compressor

Cited by 26 publications

References 14 publications

Sensorless Nonlinear Stroke Controller for an Implantable, Undulating Membrane Blood Pump

Sensorless Nonlinear Stroke Controller for an Implantable, Undulating Membrane Blood Pump

Observation and estimation study for sensorless control of linear vapor compressors.

Implementation and Evaluation of a Sensorless, Nonlinear Stroke Controller for an Implementable, Undulating Membrane Blood Pump

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