• Title/Summary/Keyword: Light Duty Truck

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Design of LNG fuel tank for a light duty truck and numerical analysis of heat leak to LNG tank

  • Alena, Minkasheva;Kim, Sung Joon
    • Journal of Industrial Technology
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    • v.27 no.B
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    • pp.65-70
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    • 2007
  • The LNG tank are properly designed to fit with the limited installation space of a light duty truck, Hyundai Porter II. This designed LNG tank has 36 liter capacity, so two LNG tanks installed on Porter II truck allow it to run about 432 km per fueling. It is almost two times greater than CNG mileage for same truck. To analyze the relationship between car acceleration and heat leak for different fuel vapor/liquid ratios, the modified Fortran program "Pro-Heatleak" is used. Computational analysis shows that the relationship between the heat leak and vapor/liquid ratio is linearly inversed. Heat leak increases with increasing of car acceleration when fuel vapor/liquid ratio is less than 0.5 and decreases when fuel vapor/liquid ratio is greater than 0.5. The difference between maximum and minimum heat leak for full tank is about 12 percents. For the fuel vapor/liquid ratio equal to 0.5 heat leak does not depend on car acceleration.

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Measuring Particle Number from Light-duty Diesel Vehicles in WLTP Driving Cycle (WLTP 주행모드에서의 경유차 입자상물질 개수 배출 특성)

  • Park, Junhong;Lee, Jongtae;Kim, Jeongsoo;Kim, Sunmoon;Ahn, Keunhwan
    • Journal of ILASS-Korea
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    • v.18 no.3
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    • pp.155-160
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    • 2013
  • Worldwide harmonized light-duty vehicle test procedure (WLTP) for emission certification has been developed in WP.29 forum in UN ECE since 2007. The test procedure is expected to be applied to Korean light-duty diesel vehicles at the same time of adoption in Europe. The air pollutant emissions from light-duty vehicles have been regulated with weight per distance travelled which means the driving cycles can affect the results. The six Euro-5 light-duty diesel vehicles including sedan, SUV and truck have been tested with WLTP, NEDC which is used for emission certification for light-duty diesel vehicles, and CVS-75 to estimate how much particle number emission can be affected by different driving cycles. The averaged particle number emissions have not shown statistically meaningful difference. The maximum particle number emission have been found in Low speed phase of WLTP which is mainly caused by cooled engine conditions. The amount of particle number emission in cooled engine condition is much different as test vehicles. It means different technical solution is required in this aspect to cope with WLTP driving cycle.

Vibration Characteristics of Tires for Light-duty Truck under Free Suspension (자유상태에서 경상용차용 타이어의 진동특성)

  • 김용우;최동수
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.6
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    • pp.49-56
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    • 2000
  • Due to the rapid increase of long-distance transportation, particular attentions have been paid to truck tires, especially to their dynamic characteristics. In this research, experimental modal analysis on two kinds of light-duty truck tires, i.e., radial tire and bias tire, are performed by using GRFP(global rational fraction polynomial) method to investigate differences of the dynamic behavior of the two tires. The test results have shown that the modal frequencies of bias tire are much higher than the corresponding values of radial tire with a similar mode shape, which is in accordance with the fact that the radial rigidity of bias tire is higher than that of radial tire. And most of the modal decay rates of bias tire are larger than those of radial tire within the scope of this experiment. In the frequency domain range of test, the bias tire has extra modes, which do not occur in the radial tire. This difference is based on the fact that the circumferential rigidity of the bias tire is quire low whereas that of radial tire is so high that the frequencies of the corresponding modes are out of the frequency range of test.

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A Study on the Safety of Hybrid Tuning for Light-duty Diesel Trucks (소형경유트럭의 하이브리드 튜닝 안전성에 관한 연구)

  • Jeon, Sangwoo;Kwon, Manjae;An, Hosoon
    • Journal of Auto-vehicle Safety Association
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    • v.13 no.4
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    • pp.20-25
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    • 2021
  • This paper is the result of a research on hybrid tuning technology developed to improve the actual fuel efficiency and reduce emissions of in-use light-duty diesel trucks. In this study, a hybrid powertrain was constructed by inserting an electric motor between the diesel engine and manual transmission of an internal combustion engine vehicle and installing a battery. To verify the safety, a test was conducted based on the Korean tuning regulations. In particular, since there has been no case of tuning an internal combustion engine vehicle into a hybrid vehicle in Korea, it was necessary to carry out all procedures to receive tuning approval. The approval process consists of a technical review, safety verification test, and application for tuning approval. As a result, the test vehicle was approved for tuning because both the technical review and vehicle test results were suitable. Therefore, this study confirmed the safety of diesel hybrid tuning technology, and laid the foundation for the research and development of technologies to tune into an eco-friendly vehicle as well as the activation of related industries.

INFLUENCE OF OPERATION PATTERNS OF LIGHT-DUTY FREIGHT VEHICLES ON NOx POLLUTION AT LOCAL ROADSIDES

  • Saito, A.;Ueki, S.;Takada, Y.
    • International Journal of Automotive Technology
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    • v.7 no.3
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    • pp.269-276
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    • 2006
  • Running tests on roads were conducted to clarify the influences of road infrastructure, traffic condition and vehicle's emission level to the amount of emission at local roadsides, and to reveal the operation patterns which can reduce the emission peaks. NOx emission peaks of two light duty freight diesel vehicles which have different emission levels were evaluated by using an on-board measurement system. Tests were carried out with various payload conditions and road conditions. As a result many NOx emission peaks were observed when the vehicles were starting or accelerating at intersections. The test vehicle which has higher emission level caused higher frequency and level of NOx emission peaks. Shifting up at lower engine speed in combination with lower acceleration brought out not only reduction of NOx emission peaks level but also of $CO_2$ mass emission.

An Analysis on the Emission Reduction Effect of Diesel Light-duty Truck by Introducing Electronic Toll Collection System on Highways (고속도로 영업소의 자동 요금 징수 시스템 도입에 따른 소형 경유 화물트럭의 배출가스 저감 효과 분석)

  • Park, Junhong;Lee, Jongtae;Lee, Taewoo;Kim, Jiyoung;Kim, Jeongsoo;Kil, Jihoon
    • Journal of Korean Society for Atmospheric Environment
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    • v.28 no.5
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    • pp.506-517
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    • 2012
  • Electronic Toll Collection System (ETCS), so called "Hi-Pass" in Korea, has improved traffic flow at toll gate of highways. It is known that the improvement of traffic flow should reduce air pollutants and $CO_2$ from vehicles. In this study, real driving emission of a light duty truck with Portable Emission Measurement System(PEMS) has been measured to evaluate the emission reduction effect due to ETCS. The correlations between driving variables and emissions have been analyzed to verify its effect on traffic flow improvement and emission reduction at toll gate. We considered average vehicle speed, Relative Positive Acceleration (RPA), and the distance of queue as driving variables. Compared to passing Manual Toll Collection System (MTCS) lane without queue, ETCS was able to reduce 38.7% of $NO_x$, 21.6% of soot, and 27.7% of $CO_2$. The results showed that the higher the average vehicle speed, the lower RPA and no queue in ETCS contributed to the emission reductions. Linear equation models with RPA and queue have been established by the multiple linear regression method. The linear models resulted in the higher coefficient of determination than those with only average vehicle speed used for establishing vehicle emission factors.

Research and Development of a 2.9 Liter Light-duty DME Truck Using Common Rail Fuel Injection Systems (커먼레일 연료분사 시스템을 장착한 2.9 리터급 경량 DME 트럭의 연구 및 개발)

  • Jeong, Soo-Jin;Park, Jung-Kwon;Oh, Se-Doo;Lee, Gee-Soo;Lim, Ock-Taek;Pyo, Young-Dug
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.6
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    • pp.107-116
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    • 2012
  • In this study, the trucks(2.9-liter) have been developed to use DME as fuel, and performance test of the vehicle's DME engine, power, emissions, fuel economy and vehicle aspects was conducted. For experiments, the fuel system(common-rail injectors and high-pressure pump included) and the engine control logic was developed, and ECU mapping was performed. As a result, the rail pressure from 40MPa to approximately 65% increase compared to the base injector has been confirmed that. Also, the pump discharge flow is 15.5 kg/h when the fuel rail pressure is 400rpm(40MPa), and the pump discharge flow is 92.1 kg/h when the fuel rail pressure is 2,000rpm(40MPa). The maximum value of full-load torque capability is 25.5 kgfm(based on 2,000 rpm), and more than 90% compared to the level of the diesel engine were obtained. The DME vehicle was developed in this study, 120 km/h can drive to the stable, and calculated in accordance with the carbon-balance method of fuel consumptions is 5.7 km/L.

Effect of Payload on Fuel Consumption and Emission of Light Duty Freight Truck during Acceleration Driving (소형 화물 차량의 적재량이 가속 주행 시의 연비 및 오염물질 배출에 미치는 영향)

  • Lee, Tae-Woo;Keel, Ji-Hoon;Jeon, Sang-Jin;Park, Jun-Hong;Lee, Jong-Tae;Hong, Ji-Hyung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.2
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    • pp.133-141
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    • 2011
  • The effect of payload on fuel consumption and emission of light duty freight truck during acceleration driving has been analyzed. Running tests were carried out with various payload conditions on chassis dynamometer. A typical driving pattern for urban cities was used. Real time emission measurement systems for gaseous and soot emission were utilized to investigate the real time dynamic of fuel use and exhaust emissions. It was observed that fuel use and pollutant emissions were increased as payload was increased. Under the same payload condition, the increased amount of acceleration driving is much higher than that of steady state driving. The results demonstrated the advantages of eco-driving, which is an environmentally friendly driving manner, could be emphasized in heavier payload condition. Inertial tractive power was introduced for considering the parameters affecting emission during acceleration driving, which are speed, acceleration and payload. Fuel use and emission in various driving conditions were expressed as functions of inertial tractive power. The estimated result by these functions well predicted measured result within 10 % deviation.

Research and Development of a Light-Duty DME Truck Using Common Rail Fuel Injection Systems (커먼레일 연료분사 시스템을 장착한 경량 DME 트럭의 연구 및 개발)

  • Jeong, Soo-Jin;Chon, Mun Soo;Park, Jung-Kwon
    • Journal of Institute of Convergence Technology
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    • v.2 no.1
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    • pp.24-30
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    • 2012
  • In this study, the trucks(2.9-liter) have been developed to use DME as fuel, and performance test of the vehicle's DME engine, power, emissions, fuel economy and vehicle aspects was conducted. For experiments, the fuel system(common-rail injectors and high-pressure pump included) and the engine control logic was developed, and ECU mapping was performed. As a result, the rail pressure from 40MPa to approximately 65% increase compared to the base injector has been confirmed that. Also, the pump discharge flow is 15.5 kg/h when the fuel rail pressure is 400rpm(40 MPa), and the pump discharge flow is 92.1 kg/h when the fuel rail pressure is 2,000rpm(40MPa). The maximum value of full-load torque capability is 25.5kgfm(based on 2,000rpm), and more than 90% compared to the level of the diesel engine were obtained. The DME vehicle was developed in this study, 120 km/h can drive to the stable, and calculated in accordance with the carbon-balance method of fuel consumptions is 5.7 km/L.

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