公开(公告)号：US20020026826A1

公开(公告)日：2002-03-07

申请号：US09867760

申请日：2001-05-31

申请人： Siemens Canada Limited

发明人： John Cook ,  Craig A. Weldon ,  Paul D. Perry ,  Raymond Rasokas

IPC分类号： G01M019/00

CPC分类号： F02M25/0818 ,  F02M25/0809 ,  F02M25/0836 ,  F02M2025/0845

摘要： An on-board evaporative emission leak detection system and method that detects leakage from an evaporative emission space of a fuel system of an automotive vehicle. A test includes an initialization, or stabilization, phase during which a differential between pressure in the evaporative emission space and atmospheric pressure is created, and then varied, over time, within a range of differential pressures suitable for performing a leak detection test. This varying of pressure differential alternately increases the created pressure differential above a nominal pressure differential and decreases the created pressure differential below the nominal pressure differential. The leak detection test is then performed.

摘要翻译： 一种车载蒸发排放物泄漏检测系统和方法，其检测来自机动车辆的燃料系统的蒸发排放空间的泄漏。 测试包括初始化或稳定阶段，在该阶段期间，产生蒸发发射空间中的压力和大气压力之间的差异，然后随时间变化，在适于进行泄漏检测测试的压差范围内。 压力差的这种变化交替地将产生的压力差增加到标称压力差之上，并将产生的压差降低到标称压力差以下。 然后进行泄漏检测测试。