The declining fossil fuel reserves are causing fuel prices to rise. Fuel consumption is also causing the quality of air to drop. The aim of this diploma thesis was to develop a mobile application to help drivers optimise their driving in terms of fuel efficiency. The application has been developed for Android. It obtains fuel consumption data using the OBD system, which has been built into every new vehicle in the EU since 2004. It emits an audible warning about excessive fuel consumption whenever the driver is not driving in a fuel-efficient manner. The diploma thesis presents the OBD standard and its history. It also showcases the ELM327 interface, which the application uses to connect to the OBD system. Some of the OBD commands are outlined, including the command to display the vehicle’s current fuel consumption. Since the tested vehicles do not support this, the value was calculated using data obtained from a mass air flow sensor. However, it was found that the mass air flow sensor is also not supported by all the vehicles. In addition to the current fuel consumption, the application also calculates the average fuel consumption. Developing the application involved developing an interface for testing OBD commands and functionalities that enable the acquired data to be analysed.
展开▼
