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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：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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公开(公告)号：US5635630A
公开(公告)日：1997-06-03
申请号：US651095
申请日：1996-05-21
申请人： Gary D. Dawson , William B. Blomquist , John Cook , Murray Busato
发明人： Gary D. Dawson , William B. Blomquist , John Cook , Murray Busato
CPC分类号： F02M25/0809 , F02M25/0818 , F04B9/1215
摘要： An assembly for testing an evaporative emission control system of an automotive vehicle which controls emission of volatile fuel vapors. The assembly is used to determine if a leak is present in a portion of the system which includes a vapor collection canister. The leak detection assembly incorporates a vacuum actuated canister vent control valve which seals the evaporative system so the leak detection test can be performed. A vacuum actuated pump which performs a leak detection test. An engine control unit initializes the pump by drawing air into a pump cavity and also closes the vent control valve. After the initialization period, the pump is activated to pressurize the evaporative emission control system. Once a control pressure is achieved, the cycle rate starts to drop off. If no leak exists in the system, the pump will eventually stop pumping. If there is a leak, the pump will continue to pump at a rate that will be representative of the flow characteristics of the size of the leak. After the test has been concluded, the vent control valve will unseal the system after the vacuum has been bled out through the orifice/check valve that has been holding the seal during the test.
摘要翻译： 一种用于测试汽车的蒸发排放控制系统的组件，其控制挥发性燃料蒸气的排放。 该组件用于确定在包括蒸气收集罐的系统的一部分中是否存在泄漏。 泄漏检测组件包括真空致动的罐排气控制阀，其密封蒸发系统，从而可以执行泄漏检测测试。 执行泄漏检测试验的真空致动泵。 发动机控制单元通过将空气吸入泵腔来初始化泵，还关闭排气控制阀。 在初始化阶段之后，激活泵以对蒸发排放控制系统加压。 一旦达到控制压力，循环速率开始下降。 如果系统中没有泄漏，泵将最终停止泵送。 如果有泄漏，泵将继续以一定的速度进行泵送，该速率将代表泄漏尺寸的流量特性。 试验结束后，通过在试验过程中保持密封的孔/止回阀，真空排出后，排气控制阀将开启系统。
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公开(公告)号：US5005550A
公开(公告)日：1991-04-09
申请号：US452433
申请日：1989-12-19
IPC分类号： F02M25/08
CPC分类号： F02M25/089
摘要： An improved fuel vapor purging system for a vehicle vapor storage canister associate with a positively charged engine such as a turbocharged or supercharged engine. An aspirator device is utilized to provide a pressure differential with respect to atmosphere so as to draw air through the canister for purging.
摘要翻译： 一种改进的用于车辆蒸气储存罐的燃料蒸气净化系统，其与带正电的发动机（例如涡轮增压发动机或增压发动机）相关联。 吸气装置用于提供相对于大气的压差，以便抽吸空气通过罐进行清洗。
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公开(公告)号：US06530265B2
公开(公告)日：2003-03-11
申请号：US09385252
申请日：1999-08-30
IPC分类号： G01M304
CPC分类号： F02M25/0809
摘要： A method is provided for detecting a small or gross leak in an evaporative emission control system of an automotive vehicle. The method includes initially purging and then sealing the evaporative emission control system. A vacuum switch coupled to the evaporative emission control system is then monitored for an opening event caused by a loss of a natural vacuum created in the evaporative emission control system. If said opening event is detected, the method determines if a leak check timer has exceeded a first or second predetermined threshold value. If the leak check timer has not exceeded said first predetermined threshold value a first fault code is set indicating that the gross leak has been detected. If the leak check timer has not exceeded the second predetermined threshold value, a second fault code is set indicating that the small leak has been detected. The first threshold value corresponds to an amount of time required for a leak to be detected having a diameter of about 0.070 inches or greater. The second threshold value corresponds to an amount of time required for a leak to be detected having a diameter of about 0.040 inches or greater.
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小或大的泄漏的方法。 该方法包括首先清洗并密封蒸发排放控制系统。 然后监测耦合到蒸发排放控制系统的真空开关，用于由蒸发排放控制系统中产生的自然真空损失引起的打开事件。 如果检测到所述打开事件，则该方法确定泄漏检查计时器是否已超过第一或第二预定阈值。 如果泄漏检查定时器没有超过所述第一预定阈值，则设置指示已经检测到总泄漏的第一故障代码。 如果泄漏检查定时器没有超过第二预定阈值，则设置指示已经检测到小泄漏的第二故障代码。 第一阈值对应于具有约0.070英寸或更大直径的检测泄漏所需的时间量。 第二阈值对应于具有约0.040英寸或更大直径的检测泄漏所需的时间量。
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6.发明授权
公开(公告)号：US6073487A
公开(公告)日：2000-06-13
申请号：US131870
申请日：1998-08-10
申请人： Gary D. Dawson
发明人： Gary D. Dawson
CPC分类号： F02M25/0809
摘要： A method of leak detection for an evaporative emission control system is provided which determines if a potential leak is present in a portion of the system. The method includes the steps of monitoring an engine shut-off event and subsequently sealing the evaporative emission control system atmospheric vent such that the evaporative emission control system's internal pressure is isolated from external influences, absent a leak. After sealing the system, the internal pressure of the system is monitored for changes which should occur upon the cooling of the evaporative emission control system components. That is, when the components cool, the pressure within the sealed system should decrease. If the internal pressure of the evaporative emissions control system reduces so as to create a vacuum, the methodology assesses that no leaks in the system are present. However, if the internal pressure within the evaporative emission control system does not create a vacuum upon cooling of the components, the methodology assesses that a potential leak exists in the system.
摘要翻译： 提供了一种用于蒸发排放控制系统的泄漏检测方法，其确定系统的一部分中是否存在潜在的泄漏。 该方法包括以下步骤：监测发动机关闭事件并随后密封蒸发排放控制系统大气通风口，使得蒸发排放控制系统的内部压力与外部影响隔离，不存在泄漏。 密封系统后，监测系统的内部压力，以便在蒸发排放控制系统部件冷却时发生变化。 也就是说，当组件冷却时，密封系统内的压力应该减小。 如果蒸发排放控制系统的内部压力降低以产生真空，则该方法评估系统中不存在泄漏。 然而，如果蒸发排放控制系统内的内部压力在部件冷却时没有产生真空，则该方法评估系统中存在潜在的泄漏。
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7.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：US3996905A
公开(公告)日：1976-12-14
申请号：US526499
申请日：1974-11-25
申请人： Gary D. Dawson
发明人： Gary D. Dawson
CPC分类号： F02M26/56 , F02M2026/009 , Y10T137/86919
摘要： A vacuum control system sourced by engine manifold vacuum particularly for exhaust gas recirculation (EGR) systems and carburetor idle enrichment systems wherein a timer means delays system operation for a predetermined period following engine start-up.
摘要翻译： 特别是用于排气再循环（EGR）系统和化油器空闲浓缩系统的发动机歧管真空源的真空控制系统，其中定时器装置在发动机起动之后的预定时间段内延迟系统运行。
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公开(公告)号：US06732025B2
公开(公告)日：2004-05-04
申请号：US10118505
申请日：2002-04-08
IPC分类号： G01M1700
CPC分类号： F01P11/14 , F01P11/16 , F01P2023/00 , F01P2023/08 , F01P2025/08 , F01P2025/13 , F01P2031/00 , F01P2037/02
摘要： A method is provided for testing a thermostat in a motor vehicle. The method includes an engine warm-up model and a thermostat diagnostic. The engine warm-up model predicts the temperature that the engine coolant temperature should be equal to at a given time after start-up. This is based on the engine coolant temperature at start-up, ambient air temperature, and how the vehicle is driven subsequent to start-up. This predicted engine coolant temperature is compared to the actual engine coolant temperature as read by an engine coolant temperature sensor. The error between the predicted engine coolant temperature and the actual engine coolant temperature is calculated and integrated over time. The thermostat diagnostic runs at a pre-selected temperature after start-up and compares the integrated error to a predetermined threshold value. Depending upon the results of the comparison, a pass, fail, or inconclusive condition is determined.
摘要翻译： 提供一种用于测试机动车辆中的恒温器的方法。 该方法包括发动机预热模式和恒温器诊断。 发动机预热模型预测发动机冷却液温度在启动后的给定时间应等于的温度。 这是基于启动时的发动机冷却液温度，环境空气温度以及启动后车辆的驱动方式。 这将预测的发动机冷却剂温度与由发动机冷却剂温度传感器读取的实际发动机冷却剂温度进行比较。 计算发动机冷却液温度和实际发动机冷却液温度之间的误差，并随时间积分。 恒温器诊断在启动后以预选温度运行，并将积分误差与预定阈值进行比较。 根据比较结果，确定通过，失败或不确定条件。
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