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公开(公告)号：US5651350A
公开(公告)日：1997-07-29
申请号：US599361
申请日：1996-03-05
申请人： William B. Blomquist , Gary D. Dawson , Roland T. Richardson , Glen Tallarek , John E. Letcher , Mark E. Hope
发明人： William B. Blomquist , Gary D. Dawson , Roland T. Richardson , Glen Tallarek , John E. Letcher , Mark E. Hope
CPC分类号： F02M25/0818
摘要： A method of leak detection for an evaporative emission control system to determine if a leak is present in a portion of the system includes the steps of energizing a leak detection pump to close a canister vent control valve of the system and pressurize the system, and determining whether a possible pinched line of the system has occurred.
摘要翻译： 一种用于蒸发排放控制系统的泄漏检测方法，用于确定系统的一部分中是否存在泄漏，包括给泄漏检测泵通电以关闭系统的罐排气控制阀并对系统加压并确定 是否发生了系统的可能的夹紧线。
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2.发明授权
公开(公告)号：US5616836A
公开(公告)日：1997-04-01
申请号：US611138
申请日：1996-03-05
CPC分类号： G01M3/025
摘要： A method of pinched line detection for an evaporative emission control system to determine if a pinched line is present within the system includes the steps of pulsing a leak detection pump at a predetermined rate and determining if a last pump period is less than a predetermined possible pinched line period limit. The method also includes the steps of concluding a possible pinched line if the last pump period is not less than the possible pinched line period limit and concluding that there is not a possible pinched line if the last pump period is greater than or equal to the possible pinched line period limit.
摘要翻译： 一种用于蒸发排放控制系统的夹紧线检测方法，用于确定系统内是否存在夹紧线，包括以预定速率脉冲泄漏检测泵的步骤，以及确定最后泵周期是否小于预定的可能夹紧 行期限。 该方法还包括以下步骤：如果最后一个泵周期不小于可能的夹持线周期极限，则确定可能的夹紧线，并且断定如果最后一个泵周期大于或等于可能的 限制行期限。
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公开(公告)号：US5685279A
公开(公告)日：1997-11-11
申请号：US611139
申请日：1996-03-05
CPC分类号： F02M25/0818
摘要： A method of de-pressurizing an evaporative emission control system includes the steps of pulsing a leak detection pump at a predetermined rate and purging accumulated vapors from a vapor canister. The method also includes the steps of determining whether a last pump period is greater than or equal to a predetermined system de-pressurization mode pump period and continuing the method if the last pump period is less than the system de-pressurization mode pump period.
摘要翻译： 一种对蒸发排放控制系统进行减压的方法包括以预定的速率脉冲泄漏检测泵的步骤，并且从蒸气罐吹扫积聚的蒸汽。 该方法还包括以下步骤：确定最后泵周期是否大于或等于预定的系统减压模式泵周期，如果最后泵周期小于系统减压模式泵周期，则继续该方法。
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4.发明授权
公开(公告)号：US5641899A
公开(公告)日：1997-06-24
申请号：US611140
申请日：1996-03-05
CPC分类号： F04B51/00 , F02M25/0818
摘要： A method of checking for purge flow in an evaporative emission control system includes the steps of determining if there is a fault in a leak detection pump, de-energizing the leak detection pump if there is a fault, and determining the state of a leak detection pump switch. The method also includes the steps of concluding a pump switch closed state if the pump switch is not opened, concluding a pump switch opened state if the pump switch is not closed, and monitoring a purge duty cycle until the evaporative emission control system is depressurized.
摘要翻译： 一种在蒸发排放控制系统中检查吹扫流量的方法包括以下步骤：确定泄漏检测泵是否存在故障，如果存在故障，则对泄漏检测泵进行断电，并确定泄漏检测的状态 泵开关。 该方法还包括以下步骤：如果泵开关未打开，则结束泵开关闭合状态，如果泵开关未闭合，则结束泵开关打开状态，并且监测净化占空比，直到蒸发排放控制系统被减压。
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5.发明授权Method of leak detection during low engine vacuum for an evaporative emission control system 失效用于蒸发排放控制系统的低发动机真空期间的泄漏检测方法
公开(公告)号：US5715799A
公开(公告)日：1998-02-10
申请号：US610947
申请日：1996-03-05
申请人： William B. Blomquist , Gary D. Dawson , Roland T. Richardson , Glen Tallarek , John E. Letcher , Mark E. Hope
发明人： William B. Blomquist , Gary D. Dawson , Roland T. Richardson , Glen Tallarek , John E. Letcher , Mark E. Hope
CPC分类号： F02M25/0818
摘要： A method of leak detection for an evaporative emission control system during periods of low engine vacuum includes the steps of pulsing a leak detection pump at a predetermined rate and determining whether engine vacuum level is low. The method also includes the steps of maintaining pressurization of the evaporative emission control system if the engine vacuum level is low, maintaining pressurization behind a vapor canister vent valve if the engine vacuum level is low, and detecting for leaks in the evaporative emission control system after a normal engine vacuum level is attained.
摘要翻译： 在低发动机真空期间的蒸发排放控制系统的泄漏检测方法包括以预定速率脉冲泄漏检测泵并确定发动机真空度是否低的步骤。 该方法还包括以下步骤：如果发动机真空度低，则保持蒸发排放控制系统的加压，如果发动机真空度低，则在蒸汽罐排气阀后面保持加压，以及在蒸发排放控制系统中的泄漏检测之后 达到正常的发动机真空度。
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公开(公告)号：US5606121A
公开(公告)日：1997-02-25
申请号：US611137
申请日：1996-03-05
申请人： William B. Blomquist , Gary D. Dawson , Roland T. Richardson , Glen Tallarek , John E. Letcher , Mark E. Hope
发明人： William B. Blomquist , Gary D. Dawson , Roland T. Richardson , Glen Tallarek , John E. Letcher , Mark E. Hope
CPC分类号： G01M3/3236
摘要： A method of testing an evaporative emission control system to determine if the evaporative emission control system has reached a predetermined pressure includes the steps of pulsing a leak detection pump at a predetermined rate and determining if a last pump period is greater than or equal to a predetermined test mode period threshold. The method also includes the steps of pressurizing the evaporative emission control system if the last pump period is less than a test mode period threshold and continuing the method if the last pump period is equal to or greater than the test mode period threshold.
摘要翻译： 一种测试蒸发排放控制系统以确定蒸发排放控制系统是否已经达到预定压力的方法包括以预定速率脉动泄漏检测泵的步骤，并且确定最后泵周期是否大于或等于预定的 测试模式周期阈值。 该方法还包括以下步骤：如果最后泵周期小于测试模式周期阈值，则对蒸发排放控制系统进行加压，并且如果最后泵周期等于或大于测试模式周期阈值，则继续该方法。
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公开(公告)号：US06202478B1
公开(公告)日：2001-03-20
申请号：US09375621
申请日：1999-08-17
IPC分类号： G01M304
CPC分类号： F02M25/0818
摘要： A method is provided for testing an evaporative emission control system for a missing or loose fuel cap comprising detecting a refueling event and running a leak detection test of the evaporative emission control system to determine if a large leak is present. If a large leak is detected, the methodology sets a fault code and activates a driver warning lamp indicating a potential cap sealing problem. The leak detection test is repeatedly re-executed after the large leak is detected to determine when the large leak condition ceases. When the large leak condition ceases, the previously set fault code is removed and the driver warning lamp is deactivated. If the large leak does not cease and is detected again after the next refueling event when an opportunity for resealing the cap existed, a new fault code is set indicating that the potential cap sealing problem is a persistent problem so that the integrity of the evaporative system may need to be tested. After setting the new fault code, fuel cap specific leak detection testing is suspended until the condition is serviced and the fault code is cleared or a normal leak detection test determines that there is no longer a problem. If no large leak is detected, the fuel cap is assumed to be properly sealed.
摘要翻译： 提供了一种用于测试用于缺失或松散的燃料盖的蒸发排放控制系统的方法，包括检测加油事件并运行蒸发排放控制系统的泄漏检测测试以确定是否存在大的泄漏。 如果检测到大的泄漏，则该方法设置故障代码并激活指示潜在的盖密封问题的驾驶员警告灯。 在检测到大泄漏以确定大泄漏状况何时停止的情况下，重新执行泄漏检测测试。 当大泄漏状况停止时，先前设置的故障代码被去除，并且驾驶员警告灯被停用。 如果在下一次加油事件发生后重新密封盖子的情况下再次检测到大泄漏，则会出现新的故障代码，指示潜在的密封问题是持续存在的问题，从而使蒸发系统的完整性 可能需要测试。 在设置新的故障代码后，燃油盖特定的泄漏检测测试被暂停，直到条件得到维护并且故障代码被清除或者正常的泄漏检测测试确定不再存在问题。 如果没有检测到大的泄漏，则认为燃料盖被正确密封。
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公开(公告)号：US06374847B1
公开(公告)日：2002-04-23
申请号：US09385251
申请日：1999-08-30
IPC分类号： F02M3500
CPC分类号： F02M25/0809 , Y10T137/043 , Y10T137/4273
摘要： A method is provided for cleansing a seal of a device used for sealing an evaporative emission control system of an automotive vehicle. The method starts by determining if a request to close the device has been made. If the request to close the device has been made, the method cycles the device a plurality of times to press and lift the seal off of a seat repeatedly. The method also determines if the seal is closed after the cycling step. If the seal is not closed after the cycling step, the method closes the seal. Preferably, the cycling step includes cycling the device at a pre-selected duty cycle, frequency and cycle count. The duty cycle, frequency, and cycle count correspond to calibration tables prepared for the particular device employed to insure that the seal strikes its seat about three times before sealing.
摘要翻译： 提供了一种用于清洁用于密封机动车辆的蒸发排放控制系统的装置的密封件的方法。 该方法从确定是否关闭设备的请求开始。 如果关闭设备的请求已经进行，则该方法多次循环设备以将密封件反复按压并提升密封件。 该方法还确定在循环步骤之后密封件是否关闭。 如果在循环步骤之后密封没有关闭，则该方法关闭密封。 优选地，循环步骤包括以预先选择的占空比，频率和循环计数循环设备。 占空比，频率和周期数对应于为特定设备准备的校准表，用于确保在密封前密封件撞击其座椅大约三次。
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公开(公告)号：US06314797B1
公开(公告)日：2001-11-13
申请号：US09385206
申请日：1999-08-30
IPC分类号： G01M304
CPC分类号： F02M25/0809 , F02D41/042
摘要： A method is provided for detecting a very small leak in an evaporative emission control system of an automotive vehicle. The method includes sealing the evaporative emission control system at a key-off event and monitoring a vacuum switch coupled to the evaporative emission control system for a closing event due to a natural vacuum created in the evaporative emission control system as it cools. If the closing event is not detected, the method determines if a leak detection timer has exceeded a predetermined threshold value. If the timer has exceeded the predetermined threshold value, the method sets a fault code indicating that the very small leak has been detected. Preferably, the leak detection timer includes a first time value corresponding to an amount of time the automotive vehicle has been operating since a previous small leak detection test was conducted and a second time value corresponding to an amount of time the automotive vehicle has been inoperative since a previous small leak detection test was conducted. The first time value includes a series of individual trip times of the automotive vehicle while the second time value includes a series of individual inoperative session times of the automotive vehicle.
摘要翻译： 提供一种用于检测机动车辆的蒸发排放控制系统中的非常小的泄漏的方法。 该方法包括在关闭事件时封闭蒸发排放控制系统，并监测耦合到蒸发排放控制系统的真空开关，由于在蒸发排放控制系统冷却时产生的自然真空，关闭事件。 如果未检测到关闭事件，则该方法确定泄漏检测定时器是否已经超过预定阈值。 如果定时器超过预定阈值，则该方法设置指示已经检测到非常小的泄漏的故障代码。 优选地，泄漏检测定时器包括与从前进行的小型泄漏检测试验开始的机动车辆已经运行的时间量相对应的第一时间值，以及对应于机动车辆已经不工作的时间量的第二时间值 进行了以前的小型泄漏检测试验。 第一时间值包括机动车辆的一系列单独行程时间，而第二时间值包括机动车辆的一系列单独的非操作会话时间。
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公开(公告)号：US5495749A
公开(公告)日：1996-03-05
申请号：US500108
申请日：1995-07-10
CPC分类号： F04B9/1215 , F02M25/0818
摘要： A leak detection assembly for an evaporative emission control system in an automotive vehicle including a fuel tank, a canister for collecting volatile fuel vapors from the fuel tank, a purge valve disposed between the canister and an intake manifold of an engine operative to allow flow of the fuel vapors from the canister to the intake manifold, a vacuum actuated pump in communication with the canister, and a vent control valve operative to selectively allow and prevent communication between the canister and an atmospheric vent of the vacuum actuated pump, the leak detection assembly including a three-port solenoid fluidly connected to the intake manifold and a second atmospheric vent, and a vacuum line fluidly connecting the three-port solenoid to the vent control valve, the three-port solenoid selectively communicating with the intake manifold to allow a vacuum in the vacuum line during a first operating mode to close the vent control valve and selectively communicating with the second atmospheric vent during a second operating mode to open the vent control valve.
摘要翻译： 一种用于汽车中的蒸发排放控制系统的泄漏检测组件，包括燃料箱，用于从燃料箱收集挥发性燃料蒸气的罐，设置在罐和发动机的进气歧管之间的净化阀，其操作以允许 从所述罐到所述进气歧管的燃料蒸汽，与所述罐连通的真空致动泵以及可操作地选择性地允许和防止所述罐与所述真空致动泵的大气通气口之间的连通的排气控制阀，所述泄漏检测组件 包括流体连接到进气歧管和第二大气通风口的三端口电磁阀和将三端口螺线管与通气控制阀流体连接的真空管线，三端口电磁阀与进气歧管选择性连通以允许真空 在第一操作模式期间在真空管线中关闭排气控制阀并选择性地与第二操作器通气 在第二操作模式下打开通风控制阀。
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