| 1. |
- Blomqvist, Daniel, et al.
(författare)
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Different Strategies for Transient Control of the Air-Fuel Ratio in a SI Engine
- 2000
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Ingår i: SAE transactions : journal of fuels and lubricants. - Warrendale, Pa. : Society of automotive engineers (SAE). - 0768008433
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Konferensbidrag (refereegranskat)abstract
- This paper compares several strategies for air-fuel ratio tran-sient control. The strategies are: A factory-standard look-up table based system (a SAAB Trionic 5), a feedback PI controller with and without feed-forward throttle correction, a linear feed-forward control algorithm, and two nonlinear feed- forward algorithms based on artificial neural networks. The control strategies have been implemented and evaluated in a SAAB 9000 car during a transient driving test, consisting of an acceleration in the second gear from an engine speed of 1500 rpm to 3000 rpm. The best strategies are found to be the neural network based ones, followed by the table based factory system. The two feedback PI controllers offer the poorest performance.
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| 2. |
- Hellring, Magnus, et al.
(författare)
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An ion current based peak-finding algorithm for pressure peak position estimation
- 2000
-
Ingår i: SAE technical paper series. - Warrendale, PA : Society of Automobile Engineers. - 0148-7191.
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Tidskriftsartikel (refereegranskat)abstract
- In this paper a novel ion current based estimation scheme for the in-cylinder pressure peak position (PPP) is proposed. A reliable estimate is constructed by appropriate signal processing based on local curvatures of the post flame phase of the ion current. The peak-finding algorithm is simple and easy to implement in an engine control unit for feedback control of the combustion phasing. Results on real data, sampled onboard a commercial car are presented. Further, the performance of the algorithm is compared to two state of the art algorithms for PPP estimation from the ion current. The comparison shows that the algorithm presented in this paper outperforms its competitors. Copyright © 2000 Society of Automotive Engineers, Inc.
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| 3. |
- Holmberg, Ulf, et al.
(författare)
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An identification-for-control procedure with robust performance
- 2000
-
Ingår i: Control Engineering Practice. - Exeter : Elsevier. - 0967-0661 .- 1873-6939. ; 8:10, s. 1107-1117
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Tidskriftsartikel (refereegranskat)abstract
- A data-driven controller design procedure is proposed in this paper. The controller is based on both an estimated plant model and its estimated uncertainty described by an ellipsoid in parameter space. Desired performance is specified by the speed and the damping of the modeled response. The unmodeled response is rejected by requiring robust performance with respect to a generalized stability region. Moreover, estimation of a disturbance model enables further rejection of the unmodeled response. The methodology is applied to a nonlinear and unstable magnetic suspension system. High performance is achieved for various specifications over a large operational range.
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