An Engine Start/Stop System for Improved Fuel Economy

Bishop, John; Nedungadi, A.; Ostrowski, Gregory; Surampudi, Bapiraju; Armiroli, Paul; Taspinar, Ertugrul

doi:10.4271/2007-01-1777

Cited by 86 publications

(37 citation statements)

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“…Moreover, they showed that the shutdown time had a considerable influence on NO x emissions. Bishop et al (2007) performed chassis dynamometer tests to determine the fuel economy improvement of an S/S system, noting a 5.3% reduction in fuel consumption in the city FTP75 test cycle. Yu et al (2008) conducted experiments on a gasoline engine coupled to an eddy-current dynamometer and showed that HC transient emissions are higher when the engine is quickly started in the original engine calibration mode.…”

Section: Introductionmentioning

confidence: 99%

Influence of the stop/start system on CO2 emissions of a diesel vehicle in urban traffic

Fonseca

Casanova

Valdés

2011

Transportation Research Part D: Transport and Environment

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This paper presents measurements of C0 2 emission and efficiency of stop/start technology on a diesel vehicle in urban traffic. Two four-wheel-drive diesel vehicles with on-board exhaust emission and vehicle activity measurement systems were tested in two urban driving circuits representative of downtown Madrid. The vehicles had similar turbocharged and intercooled diesel engines fulfilling the same Euro 4 emissions regulation; but one had an improved engine incorporating stop/start technology. C0 2 emission reduction of more than 20% for the car equipped with the stop/start system was obtained. Regardless of the variability in driving style, the grade and type of streets, traffic congestion, and the engine operating temperature, the car equipped with the stop/start system has intrinsically a lower C0 2 emission factor.

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Section: Introductionmentioning

confidence: 99%

Influence of the stop/start system on CO2 emissions of a diesel vehicle in urban traffic

Fonseca

Casanova

Valdés

2011

Transportation Research Part D: Transport and Environment

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“…It is clearly found that the benefit of fuel economy (percent of fuel economy improvement) by the engine start / stop system is increased as the stopping frequency is increased. A similar engine start / stop system was integrated in a mild HEV and tested [30]. Bishop, et al integrated it with a starter / alternator in the vehicle and tested it on a chassis dynamometer for city and highway drive cycles.…”

Section: Control Of Engine Start / Stopmentioning

confidence: 99%

Vehicle Inertia Impact on Fuel Consumption of Conventional and Hybrid Electric Vehicles Using Acceleration and Coast Driving Strategy

Lee

Nelson

Lohse-Busch³

2009

SAE Technical Paper Series

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In the past few years, the price of petroleum based fuels, especially vehicle fuels such as gasoline and diesel, has been increasing at a significant rate. Consequently, there is much more consumer interest related to reducing fuel consumption for conventional vehicles and hybrid electric vehicles (HEVs) than in the past.The goal of many competitions and challenges held in North America and Europe is to achieve extremely low fuel consumption. A possible strategy to reduce fuel consumption is to use the vehicle's fuel converter such as an engine to accelerate the vehicle to a high speed and coast to a lower speed with the engine off. This method will reduce fuel flow to zero during the coast phase. Also, the vehicle uses higher power engine load to accelerate to the upper vehicle speed in a limited time, thus increasing the engine brake thermal efficiency. This strategy is known as "pulse and glide" or "burn and coast" in some references.In this study, the "pulse and glide" (PnG) method is first applied to a conventional vehicle to quantify the fuel consumption benefits when compared to steady speed conditions over the same distance. After that, an HEV is used as well to investigate if a hybrid system can further reduce fuel consumption with the proposed strategy. Note that the HEV used in this study has the advantage that the engine can be automatically shut off below a certain speed (~40 mph) at low loads, however a driver must shut off the engine manually in a conventional vehicle to apply this driving strategy.iii In this document, three preliminary results of the PnG driving strategy are presented; (1) improved fuel economy for a conventional vehicle from a simple spread sheet model, (2) improved fuel economy for an HEV from a dynamic vehicle simulation model (the Powertrain Analysis Toolkit (PSAT)) and (3) improved fuel economy for an HEV from vehicle testing at Argonne National Laboratory (ANL), all compared to steady speed conditions. The preliminary results show that the impact of engine load and kinetic energy stored in vehicle inertia is significant for fuel consumption using a PnG driving strategy compared to steady speed driving at the same average speed case. Especially, fuel economy can be improved at low speed range and higher acceleration because the aerodynamic drag force is smaller at low speed and the engine is running in a more efficient region for a short period of time respectively. In the last section, proposed directions of research are addressed based on the preliminary results.iv

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“…Theoretically, solar-powered air ventilators help to decrease cabin temperature by removing hot air from the cabin and replacing it with cooler fresh air. This method is capable of reducing the ambient cabin air temperature at the windshield and the dashboard by up to 8.3°C on average (Bishop et al, 2007;Henein, Taraza, Chalhoub, Lai, & Bryzik, 2000). Research into the use of sunshades during sunshine has been conducted by Manning & Ewing (2009) and AlKayiem et al (2010), and the effect of sunshades has proved to be significant.…”

Section: Introductionmentioning

confidence: 99%

Variation of Car Cabin Temperature Influenced by Ventilation under Direct Sun Exposure

Mansor¹,

Rahman²,

Abidin³

et al. 2014

J MECH ENG SCI

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In the past few years many fatalities have been reported as the result of internal car heat. Problems arise when the temperature in a car cabin is too hot when parked under direct sunlight. The trapped and accumulated heat causes the temperature inside a car to reach up to 36˚C and even up to 50˚C. The objectives of this paper are to study and analyze the behavior of car cabin temperature influenced by ventilation under direct sun exposure. The performance of the proposed mathematical modelling was compared to data collected in real time from the car cabin. The simulation model was used to study the behavior of cabin temperature by investigating the ventilation mass flow rate as its parameter. An experimental result was obtained from measurements on a salon car parked in the direct sun. It is hoped that this study will be able to provide beneficial information for car interior design and material selection in order to improve comfort levels in cars.

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An Engine Start/Stop System for Improved Fuel Economy

Cited by 86 publications

References 0 publications

Influence of the stop/start system on CO2 emissions of a diesel vehicle in urban traffic

Influence of the stop/start system on CO2 emissions of a diesel vehicle in urban traffic

Vehicle Inertia Impact on Fuel Consumption of Conventional and Hybrid Electric Vehicles Using Acceleration and Coast Driving Strategy

Variation of Car Cabin Temperature Influenced by Ventilation under Direct Sun Exposure

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