Conference Paper

A comparative study of the new LQ-MCS control on an automotive electro-mechanical system

Univ. of Naples Federico II, Naples
DOI: 10.1109/ISCAS.2008.4541477 Conference: IEEE International Symposium on Circuits and Systems (ISCAS 2008), At Seattle, WA, USA
Source: DBLP


This paper is concerned with the design and comparison of a new optimal-adaptive control of an electronic throttle body. Numerical results are complemented by experiments.

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Available from: Stefania Santini
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    • "More complex nonlinear approaches have also been proposed to describe the friction effect on valve motion as, for example in [39], where a nonlinear friction force is considered to describe both dry friction and damping forces. To conjugate the simplicity of the model with its accuracy, in what follows the friction force is described by a static Coulomb model modified in order to include the Stribeck effect [35], [40]–[42] as (4) where (N) is the Coulomb sliding friction constant force; (N) is the maximum static friction force, assumed to be constant; m/s is the inverse of the sliding speed coefficient; is a scalar quantity (here assumed to be 1) and (Ns/m) is the viscous friction coefficient. "
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    ABSTRACT: In automotive industry the Electronic Throttle Body (ETB) plays a crucial role in drive-by-wire operations since it controls the incoming air into the engine and so the produced torque. This implies the performances of the vehicle in terms of traction, emissions, idle speed regime, cold starting management, thermal transient and smoother movement during tip/in tip/out, strongly depends on the precise control of this device [17]. Despite its apparent simplicity, the behavior of the ETB is affected by many nonlinearities and uncertain parameters which can dramatically alter its dynamics. In order to cope the unwanted nonlinear phenomenons (stick-slip motion, hysteresis, hunting, impact, caos), sophisticated model based control strategies and compensators are proposed in the literature. A time consuming identification parameters of the throttle is fundamental for these approaches and it is the main drawback for their application. The aim of the paper is to show the efficiency of a model reference adaptive algorithm, named LQ-MCS (Linear Quadratic-Minimal Control Synthesis), to control the throttle plate position. The main feature of this controller is that minimal synthesis is needed to implement the strategy. Specifically only a rough nominal linear model of the plant is required to impose the dynamical behavior of the reference model. By means of a proper experimental setup, the adaptive controller is synthesized and validated experimentally.
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    ABSTRACT: This paper presents the first digital implementation of a novel model reference adaptive scheme for the control of piecewise affine circuits and systems. The control law is implemented by using a low-cost commercial microcontroller. The aim is to control a piecewise-linear electrical circuit. The experimental validation process is made challenging by the presence of measure uncertainties, noise, quantization errors, unmodelled nonlinear dynamics, computational delays. Moreover, a digital microcontroller is used to implement an analogue continuous-time control law. Nevertheless, experiments confirm the effectiveness of the controller to cope with switching in the circuit dynamics, establishing the strategy as a viable control tool.
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