公开(公告)号：US6050245A

公开(公告)日：2000-04-18

申请号：US976387

申请日：1997-11-21

申请人： John E. Cook ,  Paul D. Perry ,  Craig A. Weldon

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

IPC分类号： F02B23/10 ,  F02M25/08 ,  F16K31/06 ,  F16K37/00 ,  F02M33/02

CPC分类号： F02M25/0836 ,  F02B23/104 ,  Y02T10/125

摘要： A vapor collection canister vent valve contains both an electric pressure sensor for measuring evaporative emission space pressure during a diagnostic test and an electric actuator for operating the vent valve closed during a diagnostic test. Use of the valve in an evaporative emission control system reduces the number of connections, both electrical and fluid, that are required to install the valve in a system. The remote location of the pressure sensor damps the effect of pressure transients, such as those due to tank fuel slosh, on the sensor.

摘要翻译： 蒸气收集罐排气阀包含用于在诊断测试期间测量蒸发排放空间压力的电压传感器和用于在诊断测试期间关闭排气阀的电致动器。 在蒸发排放控制系统中使用阀门减少了将阀安装在系统中所需的电气和液体的连接数量。 压力传感器的偏远位置可以抑制压力瞬变的影响，例如由于油箱燃油而产生的压力瞬变对传感器的影响。

公开(公告)号：US06283097B1

公开(公告)日：2001-09-04

申请号：US08918065

申请日：1997-08-25

申请人： John E. Cook ,  Paul D. Perry ,  Craig A. Weldon

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

IPC分类号： F02M3704

CPC分类号： F02M25/0818

摘要： A leak detection system for detecting leakage from a portion of a vapor confinement space which is upstream of an inlet of a canister purge valve relative to an engine. During a test, an electric-motor-operated air pump pumps atmospheric air through a flowpath providing communication between the pump and the vapor confinement space. A flowmeter has a thermistor in the flowpath. The thermistor has a predetermined temperature vs. electric current characteristic that enables it to provide a signal correlated to flow of air through the flowpath. An electric circuit supplies and measures the electric current drawn by the thermistor to create a signal representative of the pumped airflow. The test is conducted in accordance with an algorithm that pre-heats the thermistor to a stable state before the pump is turned on. The pump is then turned on to create a predefined superatmospheric target pressure in the vapor confinement space. Once the target pressure is reached, the airflow measured by the flowmeter provides a leakage measurement. The pump is then shut off and the vapor space vented to atmosphere through the flowmeter and pump. The thermistor current draw is once again measured to detect any drift in its characteristic.

摘要翻译： 一种泄漏检测系统，用于检测来自罐排放阀的入口相对于发动机的上游的蒸汽限制空间的一部分的泄漏。 在测试期间，电动机操作的空气泵通过提供泵和蒸汽限制空间之间的连通的流动路径泵送大气。 流量计在流路中具有热敏电阻。 热敏电阻具有预定的温度对电流特性，使其能够提供与通过流路的空气流相关的信号。 电路提供并测量由热敏电阻吸引的电流，以产生代表泵送气流的信号。 该测试根据在泵打开之前将热敏电阻预热到稳定状态的算法进行。 然后将泵打开以在蒸汽限制空间中产生预定的超大气压目标压力。 一旦达到目标压力，流量计测量的气流就会提供泄漏测量。 然后关闭泵，蒸汽空间通过流量计和泵排放到大气中。 再次测量热敏电阻电流消耗以检测其特性中的任何漂移。

公开(公告)号：US06260410B1

公开(公告)日：2001-07-17

申请号：US09037784

申请日：1998-03-10

申请人： John Cook ,  Craig A. Weldon ,  Paul D. Perry ,  Raymond Rasokas

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

IPC分类号： G01M1500

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。

公开(公告)号：US6044314A

公开(公告)日：2000-03-28

申请号：US37785

申请日：1998-03-10

申请人： John Cook ,  Craig A. Weldon ,  Paul D. Perry ,  Raymond Rasokas

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

IPC分类号： G01M3/02 ,  G01M15/00

CPC分类号： G01M3/025

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. A leak size measurement is then obtained using an algorithm.

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。 然后使用算法获得泄漏尺寸测量。

公开(公告)号：US06631634B2

公开(公告)日：2003-10-14

申请号：US09867760

申请日：2001-05-31

申请人： John Cook ,  Craig A. Weldon ,  Paul D. Perry ,  Raymond Rasokas

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

IPC分类号： G01M1500

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。 然后执行泄漏检测测试。

公开(公告)号：US5803056A

公开(公告)日：1998-09-08

申请号：US798818

申请日：1997-02-12

申请人： John E. Cook ,  Paul D. Perry ,  Craig A. Weldon

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

IPC分类号： F02B23/10 ,  F02M25/08 ,  F02M37/04

CPC分类号： F02M25/0836 ,  F02B23/104 ,  Y02T10/125 ,  Y10T137/7761

摘要： A vapor collection canister vent valve contains both an electric pressure sensor for measuring evaporative emission space pressure during a diagnostic test and an electric actuator for operating the vent valve closed during a diagnostic test. Use of the valve in an evaporative emission control system reduces the number of connections, both electrical and fluid, that are required to install the valve in a system. The remote location of the pressure sensor damps the effect of pressure transients, such as those due to tank fuel slosh, on the sensor.

摘要翻译： 蒸气收集罐排气阀包含用于在诊断测试期间测量蒸发排放空间压力的电压传感器和用于在诊断测试期间关闭排气阀的电致动器。 在蒸发排放控制系统中使用阀门减少了将阀安装在系统中所需的电气和液体的连接数量。 压力传感器的偏远位置可以抑制压力瞬变的影响，例如由于油箱燃油而产生的压力瞬变对传感器的影响。

公开(公告)号：US06658925B2

公开(公告)日：2003-12-09

申请号：US10315943

申请日：2002-12-11

申请人： John Cook ,  Craig A. Weldon ,  Paul D. Perry ,  Raymond Rasokas

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

IPC分类号： G01M1500

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。

公开(公告)号：US5987968A

公开(公告)日：1999-11-23

申请号：US037783

申请日：1998-03-10

申请人： John Cook ,  Craig A. Weldon ,  Paul D. Perry ,  Raymond Rasokas

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

IPC分类号： F02M25/08 ,  G01M3/20 ,  F02M37/04

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

摘要： A module 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. A housing provides an inlet port, an outlet port, and a flow path between the inlet port and the outlet port. An electric-motor-operated impeller pump causes flow in one direction along the flow path when in a pumping mode of operation. The pump is open to flow in both the one direction and an opposite direction when in a non-pumping mode. A solenoid-operated valve is disposed in the flow path to block flow through the flow path when in a blocking mode and to pass flow through the flow path when in a passing mode. A pressure switch is exposed to the flow path at the outlet port. A lead frame assembly provides respective electric circuit connections to the motor, solenoid, and pressure switch.

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。 壳体提供入口，出口以及入口和出口之间的流动路径。 当处于泵送操作模式时，电动马达叶轮泵沿着流动路径沿一个方向流动。 当处于非泵送模式时，泵打开以在一个方向和相反方向上流动。 当处于阻挡模式时，电磁阀设置在流动路径中以阻止通过流动路径的流动，并且当处于通过模式时通过流动通道流动。 压力开关暴露在出口处的流动路径上。 引线框架组件为电动机，螺线管和压力开关提供相应的电路连接。