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首页> 美国政府科技报告 >A Study of Driving and Storage Patterns of Nonprimary Private Vehicles in the South Coast Air Basin
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A Study of Driving and Storage Patterns of Nonprimary Private Vehicles in the South Coast Air Basin

机译：南海岸流域非主要私人车辆驾驶与储存模式研究

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This report presents the results of a survey to determine the usage patterns of nonprimary private vehicles: vehicles which are used primarily for trips shorter than 7.5 miles each way or driven 3 days per week or less. Such operating conditions could render the evaporative emission control system ineffective by overloading the charcoal canister due to multiple hot soak and/or multiple diurnal cycles with insufficient purging. A telephone questionnaire survey was conducted using 800 randomly selected households in the South Coast Air Basin (SCAB). Results of the survey indicates that nonprimary vehicles constituted 52.6 percent of all vehicles or 2.95 million vehicles over the SCAB region. An analysis of the data revealed four distinct driving patterns.

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