TY - CHAP

T1 - An Adaptive Two-Stage Observer in the Control of a New Electromagnetic Valve Actuator for Camless Internal Combustion Engines

AU - Mercorelli, Paolo

PY - 2011

Y1 - 2011

N2 - In this paper, the experimental results for the design and operation of a special linear electromagnetic motor as a variable engine valve actuator are presented. A detailed description is given on the design procedure aimed at meeting the requirements of a high dynamic range and low power consumption, including determinations of the actuator’s topology and parameters, the force and the dynamic and power loss calculations. Moreover, based on a nonlinear model, an adaptive two-stage observer is presented to tackle unobservable points and achieve sensorless control. Further, this paper presents feasible real-time self-tuning of an approximated velocity estimator based on measurements of current and input voltage. The robustness of the velocity tracking is addressed using aminimum variance approach. The effect of the noise is minimised, and the position can be achieved through a two-stage structure between this particular velocity estimator and an observer based on the electromechanical system. This approach avoids a more complex structure for the observer and yields an acceptable performance and the elimination of bulky position-sensor systems. A control strategy is presented and discussed as well. Computer simulations of the sensorless control structure are presented in which the positive effects ofthe observer with optimised velocity are visible in the closed-loop control.

AB - In this paper, the experimental results for the design and operation of a special linear electromagnetic motor as a variable engine valve actuator are presented. A detailed description is given on the design procedure aimed at meeting the requirements of a high dynamic range and low power consumption, including determinations of the actuator’s topology and parameters, the force and the dynamic and power loss calculations. Moreover, based on a nonlinear model, an adaptive two-stage observer is presented to tackle unobservable points and achieve sensorless control. Further, this paper presents feasible real-time self-tuning of an approximated velocity estimator based on measurements of current and input voltage. The robustness of the velocity tracking is addressed using aminimum variance approach. The effect of the noise is minimised, and the position can be achieved through a two-stage structure between this particular velocity estimator and an observer based on the electromechanical system. This approach avoids a more complex structure for the observer and yields an acceptable performance and the elimination of bulky position-sensor systems. A control strategy is presented and discussed as well. Computer simulations of the sensorless control structure are presented in which the positive effects ofthe observer with optimised velocity are visible in the closed-loop control.

KW - Engineering

UR - http://www.intechopen.com/books/new-trends-and-developments-in-automotive-system-engineering

UR - https://www.mendeley.com/catalogue/d4069fda-1d24-3248-b335-22e60fc1b0b8/

U2 - 10.5772/13009

DO - 10.5772/13009

M3 - Contributions to collected editions/anthologies

SN - 978-953-307-517-4

SP - 343

EP - 368

BT - New Trends and Developments in Automotive System Engineering

A2 - Chiaberge, Marcello

PB - InTech Open Access Publisher

CY - Croatia

ER -