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Research Papers: Alternative Energy Sources

Evaluation of Fuel Economy and Emissions Reduction for a Motorcycle With Automatic Idling-Stop Device

[+] Author and Article Information
Chih-Hsien Yu

Department of Vehicle Engineering,
National Pingtung University of
Science and Technology,
Pingtung 912, Taiwan

Chyuan-Yow Tseng

Department of Vehicle Engineering,
National Pingtung University of
Science and Technology,
Pingtung 912, Taiwan
e-mail: chyuan@mail.npust.edu.tw

Shiunn-Cheng Chuang

Department of Air Quality
Protection and Noise Control,
Environmental Protection
Administration Executive Yuan,
Taipei 100, Taiwan

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 15, 2013; final manuscript received February 9, 2014; published online April 16, 2014. Assoc. Editor: Timothy J. Jacobs.

J. Energy Resour. Technol 136(2), 021206 (Apr 16, 2014) (9 pages) Paper No: JERT-13-1117; doi: 10.1115/1.4026914 History: Received April 15, 2013; Revised February 09, 2014

In an attempt to improve the fuel economy and reduce the exhaust emissions of motorcycles, some manufactures have developed commercialized motorcycles equipped with automatic idling-stop and go (AISG) functionality. Even though research efforts devoted to the idling-stop strategy have demonstrated its effectiveness, motorcycles equipped with the AISG device are not popular because the general public still has some concerns about them. This paper aims to evaluate the benefits and feasibility of a commercialized motorcycle with AISG functionality with regard to the public's concerns about fuel economy and emission problems during engine restart transients. In order to verify the accuracy of the analytical results and control for variable driver characteristics, a motorcycle chassis dynamometer was used to recreate the urban driving pattern. Furthermore, the feasibility of fuel-saving and emissions improvement by adjusting fuel-injection signal of the engine control unit (ECU) during engine restart operation was also evaluated. The experimental results showed that the addition of the fuel-injection modulation plus idling-stop strategy can improve the fuel economy rate by up to 12.2% and reduce carbon monoxide (CO) emission by up to 36.95% in comparison with the non-idling stop case.

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Figures

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Fig. 1

Photo of the motorcycle chassis dynamometer

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Fig. 2

The recorded data of the urban driving pattern recreated on a dynamometer

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Fig. 3

Map of correction factor for fuel consumption calculation

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Fig. 4

An experiment about fuel consumption measurement for repeatability analysis: (a) ECE driving pattern and (b) the divergence between the two fuel consumption measurements

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Fig. 5

The relationship between output voltage and air–fuel ratio of the originally equipped oxygen sensor

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Fig. 6

The experiment results from the acceleration/deceleration driving pattern

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Fig. 7

The experiment results from four experimental cases with different accelerations: (a) a = 0.375 m/s2, (b) a = 0.5 m/s2, (c) a = 0.6 m/s2, and (d) a = 2 m/s2

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Fig. 8

Experimental results of the engine restart procedure

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Fig. 9

Experimental results of comparing the engine temperature between idling-stop mode and nonidling-stop mode executing an urban driving pattern

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Fig. 10

Emission characteristics obtained from the acceleration/deceleration driving pattern test

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Fig. 11

The external control circuitry of fuel injection

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Fig. 12

Experimental results of three experimental cases under a twice repeated simplified driving pattern

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Fig. 13

The fuel consumption and CO emission of three different cases following an urban driving pattern

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