Automotive Control Systems

Kiencke, Uwe; Nielsen, Lars

doi:10.1016/b0-12-227410-5/00048-x

Cited by 233 publications

(73 citation statements)

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“…The stopping distance D stop for a vehicle is determined by its deceleration γ, which depends on the effective coefficient of friction between the tires and the road, and the driver's reaction time T r in a braking situation (Kiencke and Nielsen, 2000):…”

Section: Decentralized Fog-pilotmentioning

confidence: 99%

Visibility monitoring using conventional roadside cameras – Emerging applications

Babari

Hautiére

Dumont

et al. 2012

Transportation Research Part C: Emerging Technologies

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The measurement of atmospheric visibility is an important element for road and air transportation safety. We propose in this paper a novel estimator of the atmospheric visibility by already existing conventional highway cameras, with a technique based on the gradient magnitude selected by applying Lambert's law with respect to changes in lighting conditions. The response of this estimator is calibrated by non-linear regression with data from a visibility meter installed in a test site which has been instrumented with a camera. Through our technique, atmospheric visibility estimates are obtained with an average error of 30% for images taken in the day, with sky luminance between 10 to 8,000 cd.m −2 and visibility distances up to 15 km. Our results allow us to envision practical implementation on roadsides in the near future to determine local visibility for the benefit of road safety, meteorological observation and air quality monitoring.

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Section: Decentralized Fog-pilotmentioning

confidence: 99%

Visibility monitoring using conventional roadside cameras – Emerging applications

Babari

Hautiére

Dumont

et al. 2012

Transportation Research Part C: Emerging Technologies

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“…Şekil 7'de, arkaya daha fazla aktarılmış tork ise arka tekerleklerdeki boyuna kaymayı yükseltmektedir (grafik j). Fakat her durumda Şekil 6-7, grafik h ve j'lerdeki boyuna kayma, ABS'nin de çalıştığı 0,1-0,2 kayma değer aralığı göz önüne alındığında, oldukça düşüktür [22]. Savrulma Oranı-Zaman grafiklerinde görülmektedir ki referans değeri her durumda takip edilmektedir.…”

Section: Simulations)unclassified

Yanal Yol Tutuş Kararliliği İçi̇n Merkezi̇ Di̇feransi̇yel Kontrolü Tabanli Çeki̇ş Torku Dağitimi

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2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Karayolu taşıtlarında, merkezi diferansiyelin aktif kontrolü için bir çoklu model geçişli kontrolcü (çmgk) algoritması oluşturulmuştur. aracın yol tutuşunda ve aktif güvenlikte etkin rol alan parametrelerin en kısa tepki süresinde, tasarlanmış kontrolcü kazancı sayesinde, beklenen, makul değerlerine yakınsaması istenmektedir. farklı tutunma katsayılarına sahip yol yüzeyleri baz alınarak doğrusallaştırma yapılmış ve farklı işletim noktaları için sistem modelleri oluşturulmuştur. bu modellerin her biri için, hıza karşı dayanımlı olacak durum geri beslemeli kontrolcü kazancı değerleri doğrusal matris eşitsizlikleri (linear matrix inequalities, lmı) kullanılarak elde edilmiştir. modeller arasında algoritmanın yapacağı geçişlerde kararlılık şartlarının sağlandığı gösterilmiştir. savrulma oranı için referans takibi sağlanmıştır. yol tutuşunda etkin diğer parametreler, kararlı sürüş için beklenen değerlerinde seyrederken, kontrolsüz araca göre yatışma zamanının kısaldığı ve salınımların azaldığı gözlenmiştir. A control algorithm has been proposed for multimodel switching control (mmsc) of the central differential mechanism of road vehicles. ın such problems, the peformance parameters related to vehicle handling are expected to converge to reference values in the shortest possible time by the use of appropriate controllers. ın the present approach, operating points of the system are determined at two different levels of the road friction coefficient and linear system models are obtained around these points. for each of the models, state feedback controllers, which are robust against the change of vehicle speed, are designed by solving linear matrix inequalities (lmi) feasibility problems. ıt is proved that the proposed algorithm satisfies stability and performance conditions during switching between the system models that are operative under varying road conditions. Yaw rate reference tracking is achieved, driving stability ensured, settling time improved and oscillations in yaw rate and sideslip angle are reduced for the controlled vehicle.10.17341/gummfd.79306

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“…Even though detailed experiments, like the ones in [5] for longitudinal stiffness, are lacking for the complete longitudinal-lateral tire interaction, there is a vast plethora of characteristics, see [1], [16], [17], and [18]. We have chosen two different tire models for our study, described below.…”

Section: B Tire Modelingmentioning

confidence: 99%

Models and methodology for optimal vehicle maneuvers applied to a hairpin turn

Berntorp

Olofsson

Bernhardsson

et al. 2013

2013 American Control Conference

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Abstract-There is currently a strongly growing interest in obtaining optimal control solutions for vehicle maneuvers, both in order to understand optimal vehicle behavior and to devise improved safety systems, either by direct deployment of the solutions or by including mimicked driving techniques of professional drivers. However, it is nontrivial to find the right mix of models, formulations, and optimization tools to get useful results for the above purposes. Here, a platform is developed based on a stateof-the-art optimization tool together with adoption of existing vehicle models, where especially the tire models are in focus. A minimum-time formulation is chosen to the purpose of gaining insight in at-the-limit maneuvers, with the overall aim of possibly finding improved principles for future active safety systems. We present optimal maneuvers for different tire models with a common vehicle motion model, and the results are analyzed and discussed. Our main result is that a few-state single-track model combined with different tire models is able to replicate the behavior of experienced drivers. Further, we show that the different tire models give quantitatively different behavior in the optimal control of the vehicle in the maneuver.

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Automotive Control Systems

Cited by 233 publications

References 0 publications

Visibility monitoring using conventional roadside cameras – Emerging applications

Visibility monitoring using conventional roadside cameras – Emerging applications

Yanal Yol Tutuş Kararliliği İçi̇n Merkezi̇ Di̇feransi̇yel Kontrolü Tabanli Çeki̇ş Torku Dağitimi

Models and methodology for optimal vehicle maneuvers applied to a hairpin turn

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