Analysis on Factors Affecting Leak Detection of Vehicle Fuel Evaporative System Jiangsu University

Format:

Book

Conference/Event

Author/Creator:

He, Ren, author.

Contributor:

Mao, Lang

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Many factors could affect the detection of a leak on a fuel tank, this paper investigates the impacts of orifice diameter, tank ullage volume, initial decay pressure, and hot soak temperature. The leak on the fuel evaporation system was simulated by using the standard orifice. The Pressure decay method was utilized in orifice diameter, ullage volume, and initial decay pressure experiments. This method utilizes an air compressor to establish a certain pressure for the system, after which the orifice is turned open and the pressure change overtime is recorded. Engine off nature vacuum method was utilized in hot soak experiments. The evaporation system was moved to a lower temperature environment after a hot soak in an aging room, than the pressure change was recorded. The results show that the larger the diameter of the orifice, the shorter the pressure decay duration. The pressure decay duration of the system with 1 mm orifice is 700 s shorter than that with 0.5 mm orifice. The smaller the ullage space, the shorter the pressures decay duration. Taking 50% of the tank volume as a reference, when the ullage volume is 20%, the maximum relative error of the pressure decay in each period is 9.92%, while it is 14.44% for the system with an ullage volume of 80%. The hot soak temperature has a certain influence. Under the condition that hot soak temperature is 30 and 40 respectively, the maximum relative error of pressure decay in each period is 7.90% for the system with an orifice diameter of 1 mm, while it is 6.50% for the system with an orifice diameter of the 0.5 mm. The leak detection is less affected if it is performed within 1-50 s of the pressure decay duration

Notes:

Vendor supplied data

Publisher Number:

2021-01-0609

Access Restriction:

Restricted for use by site license