Impacts of Real-World Driving and Driver Aggressiveness on Fuel Consumption of 48V Mild Hybrid Vehicle

Liu, Zifan; Ivančo, Andrej; Filipi, Zoran

doi:10.4271/2016-01-1166

Cited by 57 publications

(28 citation statements)

References 14 publications

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“…Modern hybrid powertrains aim to deliver excellent ride quality and high efficiency through smooth tractive torque delivery with improved fuel economy and emissions [1], [2]. To this end, some powertrains employ complex power shifting capable transmissions, minimising shift transients, but introducing other limitations and increasing cost [3].…”

Section: Introductionmentioning

confidence: 99%

Impact of Low and High Congestion Traffic Patterns on a Mild-HEV Performance

Awadallah¹,

Tawadros²,

Walker³

et al. 2017

SAE Technical Paper Series

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Driven by stricter mandatory regulations on fuel economy improvement and emissions reduction, market penetration of electrified vehicles will increase in the next ten years. Within this growth, mild hybrid vehicles will become a leading sector. The high cost of hybrid electric vehicles (HEV) has somewhat limited their widespread adoption, especially in developing countries. Conversely, it is these countries that would benefit most from the environmental benefits of HEV technology. Compared to a full hybrid, plug-in hybrid, or electric vehicle, a mild hybrid system stands out due to its maximum benefit/cost ratio. As part of our ongoing project to develop a mild hybrid system for developing markets, we have previously investigated improvements in drive performance and efficiency using optimal gearshift strategies, as well as the incorporation of high power density supercapacitors. In this paper, the fuel and emissions of a baseline conventional vehicle and mild hybrid electric vehicle (MHEV) are compared. The objective of this analysis is to compare the fuel economy and Greenhouse Gas (GHG) emissions of the baseline and MHEV models, using low and highdensity traffic patterns chosen for their similarity to traffic density profiles of our target markets. Results demonstrate the benefits of a lower ongoing cost for the HEV architecture. These advantages include torque-hole filling between gear changes, increased fuel efficiency and performance.

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Section: Introductionmentioning

confidence: 99%

Impact of Low and High Congestion Traffic Patterns on a Mild-HEV Performance

Awadallah¹,

Tawadros²,

Walker³

et al. 2017

SAE Technical Paper Series

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show abstract

“…2. 50% of passenger car journeys in cities are 5km or less [23] in the real world and this should be the distance used for real world emissions studies, as in the present work. The journeys used must also include congested traffic, if air quality issues are to be addressed.…”

Section: Discussionmentioning

confidence: 99%

“…This justifies the use of a 5km trip distance in the previous work of the authors [13,[15][16][17] and in this work. The trip analysis of Liu et al [23] also shows the unrealistic trip distance in RDE test procedures, as <1% of journeys were of this length.…”

Section: Introductionmentioning

confidence: 99%

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Real World Driving: Emissions in Highly Congested Traffic

Khalfan¹,

Andrews²,

Li³

2017

SAE Technical Paper Series

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The emissions from vehicles in real world driving are of current concern, as they are often higher than on legislated test cycles and this may explain why air quality in cities has not improved in proportion to the reduction in automotive emissions. This has led to the Real Driving Emissions (RDE) legislation in Europe. RDE involves journeys of about 90km with roughly equal proportion of urban, rural and motorway driving. However, air quality exceedances occur in cities with urban congested traffic driving as the main source of the emissions that deteriorate the air quality. Thus the emissions measured on RDE journeys may not be relevant to air quality in cities. A Temet FTIR and Horiba exhaust mass flow measurement system was used for the mass emissions measurements in a Euro 4 SI vehicle. A 5km urban journey on a very congested road was undertaken 29 times at various times so that different traffic congestion was encountered. Each journey was split into ten sections in order that the location and traffic conditions of the highest emissions could be determined. It was found that low speed stop-start traffic has much higher emissions than for freely moving traffic and most of the higher emissions on the longer 5km journeys occurred in relatively short sections of slow moving stop/start traffic. The journey used passed a roadside air quality monitor that exceeded the EU NO2 and PM standards on an annual basis and it was located by the most congested part of the route, where the traffic emissions are shown in this work to be at their highest.

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“…Although the selection of a 96 V operating voltage increases battery size and cost, it allows a significant size reduction in the motor, which is important for powertrain packaging. It is noted that current trends are toward a 48 V standard (28). However, many mild hybrid vehicles characterised by a low degree of hybridization operate on relatively higher voltages.…”

Section: Architecture and Development Approachmentioning

confidence: 99%

Comparative fuel economy, cost and emissions analysis of a novel mild hybrid and conventional vehicles

Awadallah

Tawadros

Walker

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Mild hybrid vehicles have been explored as a potential pathway to reduce vehicle emissions cost-effectively. The use of manual transmissions to develop novel hybrid vehicles provides an alternate route to producing low cost electrified powertrains. In this paper, a comparative analysis examining a conventional vehicle and a Mild HEV is presented. The analysis considers fuel economy, capital and ongoing costs, and environmental emissions, and includes developmental analysis and simulation using mathematical models. Vehicle emissions (nitrogen oxides, carbon monoxide and hydrocarbons) and fuel economy are computed, analysed, and compared using a number of alternative driving cycles and their weighted combination. Different driver styles are also evaluated. Studying the relationship between the fuel economy and driveability, where driveability is addressed using fueleconomical gear shift strategies. Our simulation suggests the hybrid concept presented can deliver fuel economy gains of between 5 and 10 percent, as compared to the conventional powertrain.

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Impacts of Real-World Driving and Driver Aggressiveness on Fuel Consumption of 48V Mild Hybrid Vehicle

Cited by 57 publications

References 14 publications

Impact of Low and High Congestion Traffic Patterns on a Mild-HEV Performance

Impact of Low and High Congestion Traffic Patterns on a Mild-HEV Performance

Real World Driving: Emissions in Highly Congested Traffic

Comparative fuel economy, cost and emissions analysis of a novel mild hybrid and conventional vehicles

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