Ivan Vazquez | Universidad Autónoma Metropolitana-Azcapotzalco (original) (raw)

Papers by Ivan Vazquez

Lecture Notes in Electrical Engineering, 2012

El sistema de frenos ABS es ampliamente usado en los automóviles de uso doméstico por su alta efi... more El sistema de frenos ABS es ampliamente usado en los automóviles de uso doméstico por su alta eficiencia y mayor aporte de seguridad, además con la masificación de su uso, el costo de éste se ha reducido. Actualmente la activación de este sistema de frenos depende en gran medida de la aplicación abrupta del pedal por parte del conductor del vehículo, por lo que el funcionamiento de éste depende principalmente de las aptitudes del conductor. En este documento se presenta una propuesta de mejoramiento del sistema de frenos ABS, considerando un enriquecimiento de la señal de activación, usando visión por computadora del espacio de rodamiento (camino transitado), tomando la señal proporcionada por el módulo de visión, a fin de tener activaciones más rápidas e independientes del conductor, y antes de que los sensores detecten que se está produciendo un bloqueo desde los neumáticos. Aquí se muestra el detalle del prototipo de mezclado-unión de las señales (computadora del automóvil + la i...

Resumen-En el presente trabajo se obtiene un modelo matemático para el sistema suspensión-frenos ... more Resumen-En el presente trabajo se obtiene un modelo matemático para el sistema suspensión-frenos de un autobús, dicho modelo puede ser utilizado para el diseño de un control en el cual la dinámica de la suspensión ayude a mejorar el desempeño del sistema de frenos.

2014 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC), 2014

Two control techniques are developed for a quarter of a vehicle ABS, Antilock Braking System, usi... more Two control techniques are developed for a quarter of a vehicle ABS, Antilock Braking System, using a laboratory setup, manufactured by INTECO. A space-state mathematical model was obtained from the system. The first technique is a basic PID controller and the second one is a nonlinear control method through error feedback using Lyapunov function techniques. Finally, both controllers are simulated using the mathematical model and then compared.

6th IFAC Symposium Advances in Automotive Control, 2010

An integral nested Sliding Mode (SM) Control is proposed for an Antilock Brake System (ABS) contr... more An integral nested Sliding Mode (SM) Control is proposed for an Antilock Brake System (ABS) control problem by employing integral SM and nested SM concepts. This controller has robustness against matched and unmatched perturbations, and the capability to reduce the sliding functions gains. Application to an ABS is presented as a simulation example.

2012 IEEE Ninth Electronics, Robotics and Automotive Mechanics Conference, 2012

ABSTRACT Oscillatory processes are present during anti-lock braking systems (ABS) activity, the d... more ABSTRACT Oscillatory processes are present during anti-lock braking systems (ABS) activity, the driver can clearly feel this effects during ABS operation, it's interesting to analyze the oscillatory behavior of the system, in order to increase the performance and comfort. In this paper we discuss the possibility of periodic changes in the angular velocity of the wheel's rotation, associated to the existence of specific regimes of ABS activity in the vicinity of maximum value for the contact force characteristic.

In order to improve both resolution and stability of single bit high order Sigma-Delta Modulators... more In order to improve both resolution and stability of single bit high order Sigma-Delta Modulators, quantization noise suppression should be carried out not only at DC but also within the bandwidth of interest. This noise suppression at frequencies different from zero is carried out with the use of resonators. Switched-Capacitor resonators at f S /n can be designed using integrating or delaying elements. In this work, both resonator structures are analyzed with respect to their robustness against the main imperfections presented in a SC implementation. The effect introduced by the operational transconductance amplifiers non-idealities was analyzed together with the effect of capacitor mismatch.

The present work shows a complete model for longitudinal movement of an automobile, is starts wit... more The present work shows a complete model for longitudinal movement of an automobile, is starts with de reference coordinate systems for every subsystem of the vehicle. The interest of the model is around the maximum value of the contact force, which physically means that the wheel is closed to a block situation. After this we obtained the characteristic values for every subsystem, and the model is evaluated for a metropolitan transport bus, Finally, considering the constant time for changes on the angular velocity as characteristic time we apply the fractional analysis to obtain a reduced order model of the bus which describes the movement with enough accuracy for the conditions considered.

The IP Multimedia Subsystem (IMS) was defined by the 3rd Generation Partnership Projects (3GPP an... more The IP Multimedia Subsystem (IMS) was defined by the 3rd Generation Partnership Projects (3GPP and 3GPP2), IP Multimedia Subsystem represents nowadays the global Service Delivery Platform (SDP) standard for providing multimedia applications in Next Generation Networks (NGN). The convergence of telecom and Internet are yet to be matured enough to effectively solve the major challenges, like quality of service, different kinds of charging, and security. IP Multimedia Subsystems (IMS) techniques are one of the strong contenders to solve the above problems by proposing overlay network architecture. In this paper an IMS design architectures was developed and a mobil client was integrated to the IMS architecture. Simulation system was implemented using "Open IMS core" and as a IMS client a java application running on cell phone. An evaluation performance of IMS client is presented. Our proposal defines an overlay service architecture that merges the paradigms and technologies of the Internet with the cellular and fixed telecommunication worlds. The architecture enables the efficient provision of an open set of potentially highly integrated multimedia services, combining web browsing, email, instant messaging, presence, VoIP, video conferencing, application sharing, telephony, unified messaging, multimedia content delivery, etc. on top of possibly different network technologies.

The present work shows a complete model for longitudinal movement of an automobile, starting with... more The present work shows a complete model for longitudinal movement of an automobile, starting with the reference coordinate systems; an inertial system, a system considering the vehicle as a rigid body and different coordinate systems for considering the center of mass of the tire and the contact element. Then the dynamics for subsystems involved in the braking process are described. The interest of the model is around the maximum value of the contact force, which physically means that the wheel is closed to a block situation. After this we obtained the characteristic values for every subsystem, and the model is evaluated for a metropolitan transport bus, Finally, considering the constant time for changes on the angular velocity as characteristic time we apply the fractional analysis to obtain a reduced order model of a vehicle, for the simulation the parameters of a bus were considered and the result the dynamics with enough accuracy for the conditions considered.

A Robust image retrieval methodology is proposed in this paper; this methodology is based on Hu i... more A Robust image retrieval methodology is proposed in this paper; this methodology is based on Hu invariant moments (invariant to scale and translation) and principal components analysis (in order to eliminate any rotation). Image comparison is done by correlation. The proposed scheme was tested with hundred of structured images like: cars, trees, leaves, grass, glasses, tables, etc. Features characteristics are extracted from invariant moments, taken from window size estimation. From a query image, a set of features were estimated in order to compare to a set of images. Correlation function is applied to get image similarity, it is obtained a believe percentage value. As a methodology conclusion, we found that the invariant moments combined with principal component analysis gives excellent results in image retrieval task. An exhaustive study was performed with 1000 images.

Proceedings of the …, 2008

Haya Shida, Subscribe (Full Service), Register (Limited Service, Free), Login. Search: The ACM Di... more Haya Shida, Subscribe (Full Service), Register (Limited Service, Free), Login. Search: The ACM Digital Library The Guide. ...

WSEAS Transactions …, 2008

A new on-line clustering fuzzy neural network is proposed. In the algorithm, structure and parame... more A new on-line clustering fuzzy neural network is proposed. In the algorithm, structure and parameter learning are updated at the same time. There is not difference between structure learning and parameter learning. It generates groups with a given radius. The center is updated in order to get that the center is near to the incoming data in each iteration, in

In Content Based Image Retrieval (CBIR) domain a new methodology is proposed in this paper; this ... more In Content Based Image Retrieval (CBIR) domain a new methodology is proposed in this paper; this methodology is based on statistical features such as Hu invariant moments (invariant to scale and translation) and a correlation measure (between 2 images). In order to attack image rotation problem, we use principal components analysis. Image comparison is done by correlation. Proposed scheme was tested with hundred of structured images like: are extracted from invariant moments, taken from window size estimation. From a query image, a set of features were estimated in order to compare to a set of images. Correlation function is applied to get image similarity, it is obtained a believe percentage value. As a methodology conclusion, we found that the invariant moments combined with principal component analysis gives excellent results in image retrieval task. An exhaustive study was performed with 1000 images. We also evaluated the impact of noise on the images testing additive Gaussian random noise.

Recent Patents on Engineering, 2010

There are patents that consider some interesting characteristics as are [1] and [2] related with ... more There are patents that consider some interesting characteristics as are [1] and [2] related with the pneumatic and in [3] the electrical elements for the rapid braking, in this paper, an uniformly stable observer for tire/road friction model estimation during braking process is proposed. In this observer the angular speed of the tire is taken as the output and it is used to estimate the internal friction state, the linear speed of the tire and the relative velocity of the vehicle . It is proven that the state error of the observer applied to the nonlinear model is uniformly stable. The observer proposed is based on the solution of a Linear Matrix Inequality (LMI) equation . A simulation shows the effectiveness of the suggested observer.