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Download (975Kb) Original citation: Birrell, Stewart A., Taylor, James, McGordon, Andrew, Son, Joonwoo and Jennings , Paul A.. (2014) Analysis of three independent real-world driving studies : a data driven and expert analysis approach to determining parameters affecting fuel economy. Transportation Research Part D: Transport and Environment , Volume 33 . pp. 74-86. Permanent WRAP url: http://wrap.warwick.ac.uk/63587 Copyright and reuse: The Warwick Research Archive Portal (WRAP) makes this work of researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available. Copies of full items can be used for personal research or study, educational, or not-for- profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions: The version presented here is a working paper or pre-print that may be later published elsewhere. If a published version is known of, the above WRAP url will contain details on finding it. For more information, please contact the WRAP Team at: [email protected] http://wrap.warwick.ac.uk/ ANALYSIS OF THREE INDEPENDENT REAL WORLD DRIVING DATA STUDIES: A DATA DRIVEN AND EXPERT ANALYSIS APPROACH TO DETERMINING PARAMETERS AFFECTING FUEL ECONOMY Stewart A Birrell1*, James Taylor1, Andrew McGordon1, Joonwoo Son2, Paul Jennings1 1WMG, University of Warwick, Coventry. CV4 7AL, United Kingdom 2HumanLAB, DGIST (Daegu Gyeongbuk Institute of Science & Technology), Daegu, South Korea *Corresponding Author: [email protected]; +44 (0) 24 7657 3752 Abstract It is well established that individual variations in driving style have a significant impact on vehicle energy efficiency. The literature shows certain parameters have been linked to good fuel economy, specifically acceleration, throttle use, number of stop/starts and gear change behaviours. The primary aim of this study was to examine what driving parameters are specifically related to good fuel economy using a non-homogeneous extended data set of vehicles and drivers over real-world driving scenarios. The analysis presented in this paper shows how three differing independent studies looking at the same factor (i.e. the influence of driver behaviour on fuel efficiency) can be evaluated, and, despite their notable differences in country, environment, route, vehicle and drivers, can be compared on broadly similar terms. The data was analysed in two ways; firstly, using expert analysis and the second a purely data driven approach. The various models and experts agreed that a combination of at least one factor from the each of the categories of vehicle speed, engine speed, acceleration and throttle position were required to predict the impact on fuel economy. The identification of standard deviation of speed as the primary contributing factor to fuel economy, as identified by both the expert and data driven analysis, is also an important finding. Finally, this study has illustrated how various seemingly independent studies can be brought together, analysed as a whole and meaningful conclusions extracted from the combined data set. Highlights Analysis of three independent real-world driving studies, from two different countries, using three different vehicles and driving scenarios with 112 participants Combined approach to use expert analysis and purely data driven approach to identify driving parameters which relate to good fuel economy Standard deviation of speed was the primary contributing factor to fuel economy Illustrated how various three independent studies can be brought together, analysed as a whole and meaningful conclusions extracted from the combined data set Keywords Statistical analysis; Data-driven analysis; Real-world driving; Fuel economy; Driver behaviour 1. Introduction It is well established that individual variations in driving style have a significant impact on vehicle energy efficiency, whether this is the fuel economy of an internal combustion engine vehicle (ICEV) or the allowable range of a hybrid or full battery electric vehicle (xEV). Regardless of the powertrain type it will always be of value to use the energy of the vehicle more efficiently. This may even be more crucial for an electric vehicle due to the limited energy of the battery (EC, 2009). One way energy efficiency can be improved is by adopting an eco-driving style; it has been suggested that fuel savings in an ICEV from adopting eco-driving techniques are between 5-15% (see Young et al, 2011 for a discussion). Reviewing the advice presented by numerous organisations (including the AA, RAC, Institute of Advanced Motorists, Energy Saving Trust, US Department of Energy to name but a few, as well as the references cited within this paper) has identified several key factors which contribute to an eco-driving style, and include: Plan ahead, anticipate traffic flow and keep a suitable following distance to help maintain a constant speed, while avoiding sharp braking and stops Use smooth but positive acceleration to reach high gears and desired cruising speeds sooner. Use engine braking (without changing down through the gears) for smooth deceleration, minimising the use of the foot brake where appropriate Change gear up as soon as possible (between 2000 and 2500 rpm) and consider the use of block gear changes (i.e. 3rd-5th) where appropriate Use uniform throttle positions with no more than half throttle used Obey speed limits. In contrast to eco-driving, fuel economy has been shown to decrease by between 20 and 40% when driving in real-world rural or urban environment when a self-selected ‘aggressive’ driving style is adopted (i.e., heavy accelerations and braking, greater throttle use, higher engine speeds, later gear changes and faster driving speeds). However, aggressive driving on higher speed motorways resulted in a non-significant increase in fuel consumption of between 7 and 12%. In addition, for all conditions in spite of the aggressive driving style adopted journey times were unaffected (De Vlieger, 1997; De Vlieger et al., 2000). Further research conducted by El-Shawarby et al., (2005) showed that exploiting the vehicle’s maximum acceleration capabilities can use up to 60% more fuel than mild or normal acceleration. More specifically, Waters and Laker (1980) demonstrated that the optimal acceleration rate in a highly controlled test track scenario was 0.07 g (0.69 m/s2), with fuel consumption increasing by 20% as acceleration increased up to 0.18 g (1.765 m/s2) – which would equate to a 0-60 mph time of approximately 15 seconds. Speed oscillations during cruising of 5 km/h also increased fuel use, by 30% at 40 km/h and by 20% at 120 km/h (Waters and Laker, 1980). A limited number of studies presented in the literature have examined the relationship between driving parameters (speed, acceleration etc.) which were significantly correlated with improved fuel economy in eco-driving verses baseline driving experimental groups, i.e. the aspects of eco-driving which related to improved fuel economy. Johansson et al (2003) found certain characteristics of driving behaviour that were significantly correlated with good fuel economy, such as avoiding unnecessary stops, low deceleration levels, minimising the use of 1st and 2nd gears, increased use of top gear, and block changing gears where possible. Gonder et al (2011) report that higher than average acceleration values among city trips corresponded with higher fuel consumption, and for highway journeys a higher average speed was the strongest indicator for poor fuel consumption. They also suggest that reducing acceleration rates results in some fuel savings, but reducing acceleration and decelerations altogether (i.e. stop/start cycles) saves a larger amount of fuel (Gonder et al, 2011). Evans (1979) shown that minimizing stops led to fuel efficiency improvements twice that of simply reducing speed (13.9% verses 6.4%), which was achieved at no cost to journey time. This suggests that driving style improvements should focus on reducing the number of stops and not just the rate of acceleration out of a stop. This can be facilitated by planning ahead to anticipate traffic flow and could also be referred to as reducing the standard deviation (SD) of speed of a specific journey or sector. Other eco-driving recommendations concern limiting throttle (or accelerator pedal) use to 50% of travel, while still being ‘positive’ to minimise engine inefficiencies (Johansson et al, 1999; van de Burgwal and Gense 2002), and changing gear before the engine speed reaches the point at which engine torque is at its highest (normally around 3,000 rpm for a gasoline fuelled engine), thereby avoiding driving at excessively high engine speeds (Johansson et al, 1999). Johansson and colleagues (1999) concluded that those who adhered to the above two recommendations, relating to throttle and engine speed, to a ‘greater extent’ exhibited significantly improved fuel consumption and lower emissions on average than those who followed the rules to a ‘lesser extent’. Specifically relevant to this current paper was the work by Ericsson (2001) who in a two-week instrumented vehicle
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