Characterization of driving maneuvers or driving styles through motion sensors has become a field of great interest. Before now, this characterization used to be carried out with signals coming from extra equipment installed inside the vehicle, such as On-Board Diagnostic (OBD) devices or sensors in pedals. Nowadays, with the evolution and scope of smartphones, these have become the devices for recording mobile signals in many driving characterization applications. Normally multiple available sensors are used, such as accelerometers, gyroscopes, magnetometers or the Global Positioning System (GPS). However, using sensors such as GPS increase significantly battery consumption and, additionally, many current phones do not include gyroscopes. Therefore, we propose the characterization of driving style through only the use of smartphone accelerometers. We propose a deep neural network (DNN) architecture that combines convolutional and recurrent networks to estimate the vehicle movement direction (VMD), which is the forward movement directional vector captured in a phone’s coordinates. Once VMD is obtained, multiple applications such as characterizing driving styles or detecting dangerous events can be developed. In the development of the proposed DNN architecture, two different methods are compared. The first one is based on the detection and classification of significant acceleration driving forces, while the second one relies on longitudinal and transversal signals derived from the raw accelerometers. The final success rate of VMD estimation for the best method is of 90.07%.
his Thesis analyzes the driving characterization by means of the accelerometers present in drivers' smartphones, applying Deep Learning techniques. This research studies both the accelerometer possibilities to address the characterization, and the ability of Deep Learning tools to learn these attributes.Most research have addressed the driving characterization employing a large number of sensors, generating in many cases the need for both the installation of extra equipment in order to capture these signals, and the access to the vehicle information. Although accelerometer signals are widely used, for example for activity recognition tasks or intelligent assistance systems, these are often complemented by others to different nature. In particular, in the driving task, most works use information from the Controller Area Network (CAN) bus of the vehicle, such as signals from the gas and brake pedals, information from the steering wheel, engine or fuel, among others. It is also common the use of location signals, such as the Global Positioning System (GPS), or motion sensors, as the gyroscope and the magnetometer.A mis padres, a mi hermano, a Javi y a Silvia.
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