交通信号機で停車するガソリン車の燃費に与えるアイドリング・ストップの効果－アイドリング・ストップ時間と燃費の関係について－

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  • Effect of Idling Stop at Traffic Signals on Fuel Consumption of Gasoline Engine Vehicles-Period of Idling Stop and Amount of Saved Fuel-
  • コウツウ シンゴウキ デ テイシャ スル ガソリンシャ ノ ネンピ ニ アタエル アイドリング ストップ ノ コウカ アイドリング ストップ ジカン ト ネンピ ノ カンケイ ニ ツイテ
  • Period of Idling Stop and Amount of Saved Fuel
  • アイドリング・ストップ時間と燃費の関係について

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Given that the atmospheric emission of CO2 is the worst cause of global warming, improving automobile fuel consumption can have positive effects on the reduction of CO2 emissions. The idling stop campaign has been suggested to accomplish this goal because it can decrease the fuel consumption and the exhaust emissions for all conventional gas engine vehicles. To measure the fuel consumption effect of short-time idling stops with the traffic signal, a comparative study has been conducted using two 1498 cc gas engine vehicles and their road performance has been analyzed. Based on our analyses, we have formulated the following equation that can predict the amount of fuel saved when the idling stop campaign is exercised:<BR>Fs=I× (∑Tis)-S2× (Nis)<BR>where Fs (cc): Saved fuel consumption, I (cc/s): Idling fuel consumption, Tis (s): Idling Stop period, S2 (cc): Additional fuel consumption by restarting, Nis: Idling stop times.<BR>Also we have proposed a new evaluation parameter, i.e., limited effecting idling stop time (LEIST) and used it as an index for the maximum efficiency duration of idling stop.Our performance test showed I=0.17 (cc/s) and S2=1.2 (cc), which indicated the tested vehicle's LEIST was 7.0 seconds, a close approximation of the result obtained in our experiment.

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