Development of a Dedicated CNG Compact Car

Hodgson, J.W.; Luton, Edward N.; Lampley, Stephen R.

doi:10.4271/952439

Cited by 2 publications

(8 citation statements)

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“…In the earlier study (Hodgson 1995), reducing emissions was not the primary focus; however, very low emissions levels were achieved. In the present study we focused on reducing the emissions further, with special emphasis on examining EGR calibration as a mechanism for…”

Section: Purpose Of the Current Studymentioning

confidence: 98%

“…In the previous study (Hodgson 1995) the role of exhaust gas recirculation was not thoroughly investigated. Those involved in the study agreed that the NO, levels could be brought down well below ULEV levels without increasing either the non-methane organic gases or the CO levels.…”

Section: The Present Studymentioning

confidence: 99%

“…More details can be found in an earlier report (Hodgson 1995), which deals with converting and evaluating the vehicle.…”

Section: The Vehiclementioning

confidence: 99%

“…In the previous study (Hodgson 1995) an earlier version of the same engine controller was used. In that study the desired stoichiometric air-fuel ratio was determined by operating the vehicle on a chassis dynamometer to simulate a steady level road speed condition of 50 mph.…”

Section: Stoichiometrymentioning

confidence: 99%

“…The study is complete and has been reported in the literature (Hodgson 1995). The design chosen was a dedicated CNG configuration with port fuel injection.…”

mentioning

confidence: 99%

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Emissions and performance evaluation of a dedicated compressed natural gas saturn

Hodgson¹,

Taylor

1997

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US. Department of Commerce 5285 DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. Preface BackgroundThe use of compressed natural gas (CNG) as a transportation fuel has been identified as one strategy that can help ameliorate some problems, which include a growing dependence on imported oil (and all its ramifications) and the persistent contributions that mobile sources make to urban air pollution, associated with the use of conventional petroleum fuels.The attributes and limitations of CNG as a fuel for spark-ignition engines have been presented by others (Weaver 1989). The attributes are associated with its high octane rating, low cost relative to other alternative fuels, its availability, the absence of running and diurnal evaporative emissions, and its demonstrated potential for producing extremely low exhaust emissions-particularly if the volatile organic compounds (VOCs) emitted are expressed in terms of reactivity adjusted non-methane organic gases (RANMOG). The limitations associated with the use of CNG include its limited refueling infiastructure, the cost of refueling facilities, the cost of on-board fuel storage tanks, and its relatively low energy density.In order for the higher (relative to the gasoline-fueled baseline vehicle) initial cost of a CNGfueled vehicle to be recouped by the lower fuel price, CNG is most attractive in high fuel'use applications. If the initial cost can be reduced, however; the economic viability of the he1 can be extended to lower fuel use applications. The use of CNG in small vehicles is especially challenging in that the incremental cost associated with the CNG system typically represents a higher fraction of the total vehicle cost than would be the case with larger, more expensive vehicles. In addition, because small vehicles are typically very fuel efficient, fuel costs may not represent an important factor for the vehicle owner. Small vehicles also present greater system packaging problems because the space available for the fuel tanks is more limited than for larger vehicles. ,Because one impediment to CNG use is the cost associated with producing a CNG-powered vehicle, a study was initiated at the University of Tennessee under sponsorship by the Saturn Corporation to determine how a CNG vehicle (specifically, a 1991 Saturn SLl) could be engineered so it could be produced with a minimal impact on the production of the base vehicle. The objectives of the design were:The vehicle should have a highway range of at least 330 km (200 miles) The utility of the vehicle should be maintained as much as possible The vehicle should meet anticipated emissions regulations The vehicle conversion should have minimal impact on the base vehicle production and should not involve major modifications to the base vehicle The conversion must meet the relevant recognized safety standards (National Fire Protection Association 1992). iThe study is complete and has been reported in the literature...

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Section: Purpose Of the Current Studymentioning

confidence: 98%

Section: The Present Studymentioning

confidence: 99%

“…More details can be found in an earlier report (Hodgson 1995), which deals with converting and evaluating the vehicle.…”

Section: The Vehiclementioning

confidence: 99%

Section: Stoichiometrymentioning

confidence: 99%

“…The study is complete and has been reported in the literature (Hodgson 1995). The design chosen was a dedicated CNG configuration with port fuel injection.…”

mentioning

confidence: 99%

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