This work is performed as collaboration between the Laboratory for Studies and Analysis of Cognition and Models, Renault Trucks and Auxirbat Recherche. Today, the fuel consumption of a truck, apart from the technical characteristics of each model, primarily depends on the driving style and interactions between driver, vehicle and road environment. The goal of the project is to provide the truck constructor with a truck driver’s behaviour model in terms of a rational driving, in order to develop an adaptive eco-driving assistance. The vehicle electronic control unit will identify the driving styles and take driver’s behavioural variability into account. Driving activity is defined as a motor and cognitive skill acquired with training and practice. It induces an essentially mental workload that will be variable according to external factors (road environment, temporal demands, etc.) and internal driver factors (expertise, personality, cognitive style, etc.). In this research, we propose a methodological approach to study truck drivers’ behaviours by psychological and ergonomic methods. An experimental procedure in a dynamic operational environment will enable:- To validate a workload index for driving tasks,- To categorize truck drivers according to economical driving styles and cognitive styles,- To translate driving behaviours into objective and measurable criteria,- To identify bad behaviours that an assistance system can correct in order to decrease fuel consumption. By recording the driver’s actions on different vehicle switches and controls (accelerator, brake, gear, etc.) we can draw the driver’s behaviours, with a specific software. In addition, the drivers must fill in several questionnaires related to personality, representations, and cognitive style and workload assessment. The first results have allowed integrating the relevant driving criteria to a simulation tool. They also have pointed out an important intra-individual variability concerning the rational driving behaviours: most of the drivers show a significant consumption difference, on the same course, before and after training in an economical driving strategy
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