ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of e... more ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of efforts have been taken in the way that we can understand, predict and follow its behavior, in the way that this could be useful for vehicle safety increasing. In this direction, several models describe the tire interaction with ground, considering the steering angle, pressure, temperature, friction coefficient and thread as well. Inside this analysis, there is the tire slip angle value, that is consequence of lateral forces acting over the tire. This characteristic is predicted in some cases, and evaluated on another ones. This paper brings to community another point of view of slip angle. We propose a mathematical model that describes a constraint linking slip angles and steering angle, in the way that makes the vehicle turns. We present the kinematic model that makes all three angles compatibles each other, function of the radius' corner. This model was simulated under two different scenarios, for an udersteering and an oversteering vehicles. At the end we show the results and the conclusions that we reached.
International Journal of Automotive Technology, 2012
ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental top... more ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental topic. Tire studies have received a considerable amount of attention from the research community because their improvement has a direct and strong impact on vehicle handling and braking. Within this eld of analysis lies an important behavioral feature: the tire slip angle, which is a consequence of lateral forces acting on the tire. This characteristic is predicted in some cases and evaluated experimentally in others. This paper addresses another way to assess the slip angle. We propose a mathematical model that describes a constraint linking the slip angle and steering angle that make a vehicle turn. We present a simplied kinematic model (based on the classic bicycle model) and a four-wheel model, which makes all of the angles involved compatible with each other. In our case, the match will be given by the determination of the turning radius. Two different scenarios, understeering and oversteering vehicles, were simulated, and the results and conclusions reached are presented herein.
ABSTRACT This article describes the tilting control system of a vehicle with variable tilting ang... more ABSTRACT This article describes the tilting control system of a vehicle with variable tilting angle by steering. The objective of the control system is to achieve an ideal angle, so that lateral forces acting on the vehicle are minimized for a given radius of curvature during cornering. A brief description of the model used for obtaining the gain schedule controller is shown. Simulations were performed using the non-linear computational model for the proposed concept and the results are shown.
This article describes the tilting control system of a vehicle with variable tilting angle by ste... more This article describes the tilting control system of a vehicle with variable tilting angle by steering. The objective of the control system is to achieve an ideal angle, so that lateral forces acting on the vehicle are minimized for a given radius of curvature during cornering. A brief description of the model used for obtaining the gain schedule controller is shown. Simulations were performed using the non-linear computational model for the proposed concept and the results are shown.
2012 12th International Workshop on Variable Structure Systems, 2012
This paper presents a robust controller for an internal combustion (IC) engine, as a first stage ... more This paper presents a robust controller for an internal combustion (IC) engine, as a first stage of a project aiming at developing a hybrid light urban vehicle, running with ethanol in lean burn. This work particularly focuses on the design of a sliding mode control for the IC engine of a series hybrid power-train. The controller must allow for speed
2010 11th International Workshop on Variable Structure Systems (VSS), 2010
... In addition, two perturbations, lateral wind and road roughness, N.Roqueiro - Departamento de... more ... In addition, two perturbations, lateral wind and road roughness, N.Roqueiro - Departamento de Automaçao e Sistemas, Univer-sidade Federal de Santa Catarina, Florian`opolis, SC, 88040 Brasil nestor@das.ufsc.br - Becario CAPES Proc. ... tan(δ) = a4 R (20) ...
ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of e... more ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of efforts have been taken in the way that we can understand, predict and follow its behavior, in the way that this could be useful for vehicle safety increasing. In this direction, several models describe the tire interaction with ground, considering the steering angle, pressure, temperature, friction coefficient and thread as well. Inside this analysis, there is the tire slip angle value, that is consequence of lateral forces acting over the tire. This characteristic is predicted in some cases, and evaluated on another ones. This paper brings to community another point of view of slip angle. We propose a mathematical model that describes a constraint linking slip angles and steering angle, in the way that makes the vehicle turns. We present the kinematic model that makes all three angles compatibles each other, function of the radius' corner. This model was simulated under two different scenarios, for an udersteering and an oversteering vehicles. At the end we show the results and the conclusions that we reached.
International Journal of Automotive Technology, 2012
ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental top... more ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental topic. Tire studies have received a considerable amount of attention from the research community because their improvement has a direct and strong impact on vehicle handling and braking. Within this eld of analysis lies an important behavioral feature: the tire slip angle, which is a consequence of lateral forces acting on the tire. This characteristic is predicted in some cases and evaluated experimentally in others. This paper addresses another way to assess the slip angle. We propose a mathematical model that describes a constraint linking the slip angle and steering angle that make a vehicle turn. We present a simplied kinematic model (based on the classic bicycle model) and a four-wheel model, which makes all of the angles involved compatible with each other. In our case, the match will be given by the determination of the turning radius. Two different scenarios, understeering and oversteering vehicles, were simulated, and the results and conclusions reached are presented herein.
ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of e... more ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of efforts have been taken in the way that we can understand, predict and follow its behavior, in the way that this could be useful for vehicle safety increasing. In this direction, several models describe the tire interaction with ground, considering the steering angle, pressure, temperature, friction coefficient and thread as well. Inside this analysis, there is the tire slip angle value, that is consequence of lateral forces acting over the tire. This characteristic is predicted in some cases, and evaluated on another ones. This paper brings to community another point of view of slip angle. We propose a mathematical model that describes a constraint linking slip angles and steering angle, in the way that makes the vehicle turns. We present the kinematic model that makes all three angles compatibles each other, function of the radius' corner. This model was simulated under two different scenarios, for an udersteering and an oversteering vehicles. At the end we show the results and the conclusions that we reached.
International Journal of Automotive Technology, 2012
ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental top... more ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental topic. Tire studies have received a considerable amount of attention from the research community because their improvement has a direct and strong impact on vehicle handling and braking. Within this eld of analysis lies an important behavioral feature: the tire slip angle, which is a consequence of lateral forces acting on the tire. This characteristic is predicted in some cases and evaluated experimentally in others. This paper addresses another way to assess the slip angle. We propose a mathematical model that describes a constraint linking the slip angle and steering angle that make a vehicle turn. We present a simplied kinematic model (based on the classic bicycle model) and a four-wheel model, which makes all of the angles involved compatible with each other. In our case, the match will be given by the determination of the turning radius. Two different scenarios, understeering and oversteering vehicles, were simulated, and the results and conclusions reached are presented herein.
ABSTRACT This article describes the tilting control system of a vehicle with variable tilting ang... more ABSTRACT This article describes the tilting control system of a vehicle with variable tilting angle by steering. The objective of the control system is to achieve an ideal angle, so that lateral forces acting on the vehicle are minimized for a given radius of curvature during cornering. A brief description of the model used for obtaining the gain schedule controller is shown. Simulations were performed using the non-linear computational model for the proposed concept and the results are shown.
This article describes the tilting control system of a vehicle with variable tilting angle by ste... more This article describes the tilting control system of a vehicle with variable tilting angle by steering. The objective of the control system is to achieve an ideal angle, so that lateral forces acting on the vehicle are minimized for a given radius of curvature during cornering. A brief description of the model used for obtaining the gain schedule controller is shown. Simulations were performed using the non-linear computational model for the proposed concept and the results are shown.
2012 12th International Workshop on Variable Structure Systems, 2012
This paper presents a robust controller for an internal combustion (IC) engine, as a first stage ... more This paper presents a robust controller for an internal combustion (IC) engine, as a first stage of a project aiming at developing a hybrid light urban vehicle, running with ethanol in lean burn. This work particularly focuses on the design of a sliding mode control for the IC engine of a series hybrid power-train. The controller must allow for speed
2010 11th International Workshop on Variable Structure Systems (VSS), 2010
... In addition, two perturbations, lateral wind and road roughness, N.Roqueiro - Departamento de... more ... In addition, two perturbations, lateral wind and road roughness, N.Roqueiro - Departamento de Automaçao e Sistemas, Univer-sidade Federal de Santa Catarina, Florian`opolis, SC, 88040 Brasil nestor@das.ufsc.br - Becario CAPES Proc. ... tan(δ) = a4 R (20) ...
ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of e... more ABSTRACT Tires have been taking an important role in vehicle safety in the last years. A lot of efforts have been taken in the way that we can understand, predict and follow its behavior, in the way that this could be useful for vehicle safety increasing. In this direction, several models describe the tire interaction with ground, considering the steering angle, pressure, temperature, friction coefficient and thread as well. Inside this analysis, there is the tire slip angle value, that is consequence of lateral forces acting over the tire. This characteristic is predicted in some cases, and evaluated on another ones. This paper brings to community another point of view of slip angle. We propose a mathematical model that describes a constraint linking slip angles and steering angle, in the way that makes the vehicle turns. We present the kinematic model that makes all three angles compatibles each other, function of the radius' corner. This model was simulated under two different scenarios, for an udersteering and an oversteering vehicles. At the end we show the results and the conclusions that we reached.
International Journal of Automotive Technology, 2012
ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental top... more ABSTRACT When considering vehicle safety, tires and all that they represent are a fundamental topic. Tire studies have received a considerable amount of attention from the research community because their improvement has a direct and strong impact on vehicle handling and braking. Within this eld of analysis lies an important behavioral feature: the tire slip angle, which is a consequence of lateral forces acting on the tire. This characteristic is predicted in some cases and evaluated experimentally in others. This paper addresses another way to assess the slip angle. We propose a mathematical model that describes a constraint linking the slip angle and steering angle that make a vehicle turn. We present a simplied kinematic model (based on the classic bicycle model) and a four-wheel model, which makes all of the angles involved compatible with each other. In our case, the match will be given by the determination of the turning radius. Two different scenarios, understeering and oversteering vehicles, were simulated, and the results and conclusions reached are presented herein.
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Papers by Nestor Roqueiro