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1. 发明授权

US06446492B2 Method and system for aggressive cycling of leak detection pump to ascertain vapor leak size 失效
标题翻译：泄漏检测泵积极循环的方法和系统，以确定蒸汽泄漏尺寸
公开(公告)号：US06446492B2
公开(公告)日：2002-09-10
申请号：US09877841
申请日：2001-06-08
申请人： Craig Weldon , John Edward Cook , Ray Rasokas
发明人： Craig Weldon , John Edward Cook , Ray Rasokas
IPC分类号： G01M304
CPC分类号： F02M25/0818
摘要： A system and method for detecting leakage from a evaporative emission space of an automotive vehicle fuel system. A reciprocating pump is operated in a pressurizing mode to build pressure in the space toward a nominal test pressure. The pressurizing mode involves operating the pump in a repeating cycle wherein the pump operates alternately in an accelerated pumping mode and a natural frequency pumping mode. During the pressurizing mode, a characteristic of successive occurrences of the natural frequency pumping mode indicative of pressure in the space is measured. The number of times the cycle repeats is counted and compared to a predefined reference. When the cycle count exceeds the predefined reference, the test continues at a lower resolution for detecting leakage, and when the cycle count does not exceed the predefined reference and a measurement of the characteristic of successive occurrences of the natural frequency pumping mode indicative of pressure in the space exceeds a predetermined reference pressure, the test continues at a higher resolution for detecting leakage. The invention is useful when overall test time is limited.
摘要翻译：一种用于检测来自汽车燃料系统的蒸发排放空间的泄漏的系统和方法。往复式泵以加压模式工作，以在标称试验压力的空间内建立压力。加压模式涉及在重复循环中操作泵，其中泵以加速泵送模式和固有频率泵送模式交替运行。在加压模式期间，测量表示空间中的压力的固有频率泵送模式的连续出现的特征。对周期重复的次数进行计数并与预定义的参考进行比较。当循环计数超过预定义的参考值时，测试以较低的分辨率继续检测泄漏，并且当循环计数不超过预定义的参考值时，测量连续发生的指示压力的固有频率泵送模式的特性该空间超过预定的基准压力，测试以更高的分辨率继续检测泄漏。当整体测试时间有限时，本发明是有用的。

2. 发明授权

US06282945B1 Method and system for aggressive cycling of leak detection pump to ascertain vapor leak size 失效
标题翻译：泄漏检测泵积极循环的方法和系统，以确定蒸汽泄漏尺寸
公开(公告)号：US06282945B1
公开(公告)日：2001-09-04
申请号：US09465030
申请日：1999-12-16
申请人： Craig Weldon , John Edward Cook , Ray Rasokas
发明人： Craig Weldon , John Edward Cook , Ray Rasokas
IPC分类号： G01M304
CPC分类号： F02M25/0818
摘要： A system and method for detecting leakage from a evaporative emission space of an automotive vehicle fuel system. A reciprocating pump is operated in a pressurizing mode to build pressure in the space toward a nominal test pressure. The pressurizing mode involves operating the pump in a repeating cycle wherein the pump operates alternately in an accelerated pumping mode and a natural frequency pumping mode. During the pressurizing mode, a characteristic of successive occurrences of the natural frequency pumping mode indicative of pressure in the space is measured. The number of times the cycle repeats is counted and compared to a predefined reference. When the cycle count exceeds the predefined reference, the test continues at a lower resolution for detecting leakage, and when the cycle count does not exceed the predefined reference and a measurement of the characteristic of successive occurrences of the natural frequency pumping mode indicative of pressure in the space exceeds a predetermined reference pressure, the test continues at a higher resolution for detecting leakage. The invention is useful when overall test time is limited.
摘要翻译：一种用于检测来自汽车燃料系统的蒸发排放空间的泄漏的系统和方法。往复式泵以加压模式工作，以在标称试验压力的空间内建立压力。加压模式涉及在重复循环中操作泵，其中泵以加速泵送模式和固有频率泵送模式交替运行。在加压模式期间，测量表示空间中的压力的固有频率泵送模式的连续出现的特征。对周期重复的次数进行计数并与预定义的参考进行比较。当循环计数超过预定义的参考值时，测试以较低的分辨率继续检测泄漏，并且当循环计数不超过预定义的参考值时，测量连续发生的指示压力的固有频率泵送模式的特性该空间超过预定的基准压力，测试以更高的分辨率继续检测泄漏。当整体测试时间有限时，本发明是有用的。

3. 发明授权

US06363921B1 Vacuum leak verification system and method 失效
标题翻译：真空泄漏验证系统及方法
公开(公告)号：US06363921B1
公开(公告)日：2002-04-02
申请号：US09659753
申请日：2000-09-08
申请人： John Cook , Craig Weldon , Ray Rasokas
发明人： John Cook , Craig Weldon , Ray Rasokas
IPC分类号： F02M3302
CPC分类号： F02M25/0836 , F02M25/0809 , F02M2025/0845
摘要： In a purge mode, a purge flow path extends from atmosphere through the vent valve, through the evaporative emission space, and through the purge valve to the engine intake system. In a pre-conditioning phase of a leak verification mode, a pre-conditioning flow path extends from atmosphere through the vent valve and the purge valve to the engine intake system without passing through the evaporative emission space. In a test phase of the leak verification mode, a test path extends from the evaporative emission space through the dirty air port, through the canister medium, through the clean air port, and through the purge valve to the engine intake system.
摘要翻译：在吹扫模式中，吹扫流动路径从大气通过排放阀，通过蒸发发射空间，并通过排放阀延伸到发动机进气系统。在泄漏验证模式的预处理阶段，预调节流动路径从大气通过排气阀和净化阀延伸到发动机进气系统，而不通过蒸发发射空间。在泄漏验证模式的测试阶段，测试路径从蒸发发射空间通过脏空气口，通过罐介质，通过清洁空气端口，以及通过排放阀延伸到发动机进气系统。

4. 发明授权

US06330878B1 Evaporative emission leak detection system including vacuum regulator with sensitive seal 失效
标题翻译：蒸发式排放泄漏检测系统，包括具有敏感密封的真空调节器
公开(公告)号：US06330878B1
公开(公告)日：2001-12-18
申请号：US09583634
申请日：2000-05-31
申请人： Paul D. Perry , Ray Rasokas
发明人： Paul D. Perry , Ray Rasokas
IPC分类号： F02M3704
CPC分类号： F02M25/0836 , Y10S137/907 , Y10T137/7784
摘要： A module (22) for an on-board evaporative emission leak detection system that detects leakage from an evaporative emission space of a fuel system of an automotive vehicle. The module has a housing (50) that includes a first port (52) for communicating the housing to the evaporative emission space and a second port (86) for communicating the housing to atmosphere. The housing contains a particulate filter (84) through which the second port communicates with two parallel flow branches that extend within the housing to the first port. One branch contains a vacuum regulator valve (90), and the other, a solenoid-operated vent valve (88). During a leak detection test, the vent valve is operated closed, and a purge valve (20), that selectively communicates the evaporative emission space with the engine intake manifold, is operated open to cause vacuum to be drawn in the evaporative emission space. The vacuum regulator valve regulates evaporative emission space vacuum to a defined vacuum. At the beginning of the measurement phase of a test, the purge valve is operated closed. Leakage is evidenced by loss of vacuum, and a pressure sensor (110) signals vacuum loss. The regulator valve has a sensitive seal element (102) that assures integrity of regulator valve closure during the measurement phase.
摘要翻译：一种用于检测来自机动车辆的燃料系统的蒸发排放空间的泄漏的车载蒸发排放泄漏检测系统的模块（22）。模块具有壳体（50），其包括用于将壳体连通到蒸发发射空间的第一端口（52）和用于将壳体连通到大气的第二端口（86）。壳体包含微粒过滤器（84），第二端口通过该微粒过滤器与在壳体内延伸到第一端口的两个平行流动分支连通。一个分支包含真空调节阀（90），另一个分配有电磁操作的通气阀（88）。在泄漏检测测试期间，排气阀被关闭运行，并且选择性地将蒸发发射空间与发动机进气歧管连通的排气阀（20）被打开以使得真空在蒸发发射空间中被抽吸。真空调节阀将蒸发发射空间真空调节至确定的真空度。在测试的测量阶段开始时，关闭排气阀。泄漏由真空损失证明，压力传感器（110）表示真空损失。调节阀具有敏感密封元件（102），其确保在测量阶段期间调节阀关闭的完整性。

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