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公开(公告)号：US20190203623A1
公开(公告)日：2019-07-04
申请号：US15862482
申请日：2018-01-04
摘要： Methods and systems are provided for waking up a powertrain control module of an engine-driven vehicle during engine soak to perform an offset test of an exhaust NOx sensor. In one example, a method includes determining a duration to delay waking up the powertrain control module based on exhaust temperature at vehicle-off, waking up the powertrain control module after the duration has expired, and then initiating heating of the NOx sensor. After the NOx sensor lights off, heating continues for an additional duration before offset testing of the NOx sensor is performed.
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公开(公告)号：US20180283248A1
公开(公告)日：2018-10-04
申请号：US15476594
申请日：2017-03-31
摘要： Methods and systems are provided for detecting a missing exhaust catalyst based on water adsorption and related exothermic temperature rise by the catalyst. In one example, a method may include indicating an exhaust catalyst missing in response to an estimated exhaust temperature profile being different from an expected exhaust temperature profile. The estimated exhaust temperature profile may be based on exhaust temperature upstream and downstream of the catalyst.
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公开(公告)号：US20160363030A1
公开(公告)日：2016-12-15
申请号：US14739834
申请日：2015-06-15
CPC分类号： F01N11/00 , F01N3/2066 , F01N3/208 , F01N11/007 , F01N2550/05 , F01N2560/026 , F01N2570/14 , F01N2900/08 , F01N2900/1402 , Y02A50/2325 , Y02T10/24 , Y02T10/47
摘要： Methods and systems are provided for detecting NOx sensor degradation based on results from a NOx sensor self-diagnostic (SD) test. In one example, a method may comprise: determining that a nitrogen oxide (NOx) sensor is degraded if outputs received from the sensor via a CAN bus during a self-diagnostic test are outside a threshold range. Additionally, only outputs received from the sensor during a self-diagnostic (SD) test performed after a first completed SD test after a key-off event, where the outputs are generated under conditions where a temperature at the sensor is less than a threshold, and an oxygen concentration is within a threshold range may be used to determine if the sensor is degraded.
摘要翻译： 提供了基于NOx传感器自诊断（SD）测试的结果来检测NOx传感器劣化的方法和系统。 在一个示例中，方法可以包括：如果在自诊断测试期间经由CAN总线从传感器接收的输出超出阈值范围，则确定氮氧化物（NOx）传感器是否劣化。 另外，仅在关闭事件之后的第一次完成的SD测试之后执行在自诊断（SD）测试期间从传感器接收的输出，其中在传感器的温度小于阈值的条件下产生输出， 并且氧浓度在阈值范围内可以用于确定传感器是否劣化。
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公开(公告)号：US12091999B2
公开(公告)日：2024-09-17
申请号：US17450247
申请日：2021-10-07
CPC分类号： F01N11/00 , B01D53/9418 , B01D53/9431 , B01D53/9495 , F01N3/021 , F01N3/208 , F01N2550/02 , F01N2610/02 , F01N2610/1453 , F01N2900/1402
摘要： Methods and systems are provided for adjusting an ammonia (NH3) sensor output using readings of a nitrogen oxide (NOx) sensor, the NOx sensor having a sensitivity factor to NH3. In one example, a method may include determining and updating a gain value of the NH3 sensor during zero NOx conditions to be used to calculate a corrected NH3 sensor output value, and determining and updating an offset value of the NH3 sensor during zero NH3 conditions to be used to zero the NH3 sensor during zero NOx conditions.
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公开(公告)号：US10378470B2
公开(公告)日：2019-08-13
申请号：US15620457
申请日：2017-06-12
发明人： Stephen William Magner , Michiel J. Van Nieuwstadt , John Erik Mikael Hellstrom , In Kwang Yoo , Adarsh Appukuttan , Jason Ronald Smith
摘要： Methods and systems are provided for providing passive boost pressure monitoring for slow response with higher confidence. A response time of a boost pressure feedback control loop following a boost pressure deviation that is triggered by either system disturbances or operator torque demand is monitored. Slow boost behavior is correlated with boost control degradation affecting drivability and emissions.
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公开(公告)号：US09670817B2
公开(公告)日：2017-06-06
申请号：US14739834
申请日：2015-06-15
CPC分类号： F01N11/00 , F01N3/2066 , F01N3/208 , F01N11/007 , F01N2550/05 , F01N2560/026 , F01N2570/14 , F01N2900/08 , F01N2900/1402 , Y02A50/2325 , Y02T10/24 , Y02T10/47
摘要： Methods and systems are provided for detecting NOx sensor degradation based on results from a NOx sensor self-diagnostic (SD) test. In one example, a method may comprise: determining that a nitrogen oxide (NOx) sensor is degraded if outputs received from the sensor via a CAN bus during a self-diagnostic test are outside a threshold range. Additionally, only outputs received from the sensor during a self-diagnostic (SD) test performed after a first completed SD test after a key-off event, where the outputs are generated under conditions where a temperature at the sensor is less than a threshold, and an oxygen concentration is within a threshold range may be used to determine if the sensor is degraded.
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公开(公告)号：US20150128565A1
公开(公告)日：2015-05-14
申请号：US14079475
申请日：2013-11-13
IPC分类号： F01N3/18
CPC分类号： F01N3/18 , F01N3/206 , F01N3/208 , F01N11/00 , F01N2550/05 , F01N2560/021 , F01N2560/026 , F01N2610/146 , F01N2900/0416 , F01N2900/1404 , F02D41/042 , F02D41/1461 , F02D41/222 , F02D2041/1469 , Y02A50/2325 , Y02T10/24 , Y02T10/40
摘要： Various systems and method for detecting exhaust NOx sensor degradation are disclosed. In one example, degradation of the NOx sensor is indicated responsive to reductant injection in an exhaust passage under engine off conditions. For example, degradation of the NOx sensor is indicated when an actual NOx sensor output differs from an expected NOx sensor output by more than a threshold amount.
摘要翻译： 公开了用于检测排气NOx传感器劣化的各种系统和方法。 在一个示例中，响应于在发动机关闭条件下的排气通道中的还原剂喷射来指示NOx传感器的劣化。 例如，当实际NOx传感器输出与期望的NOx传感器输出不同超过阈值时，指示NOx传感器的劣化。
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公开(公告)号：US20150128564A1
公开(公告)日：2015-05-14
申请号：US14079440
申请日：2013-11-13
发明人： Devesh Upadhyay , In Kwang Yoo , David John Kubinski , Jacobus Hendrik Visser , Garth Michael Meyer , Michiel J. Van Nieuwstadt
IPC分类号： F01N3/18
CPC分类号： F01N3/2066 , F01N3/208 , F01N11/00 , F01N2550/05 , F01N2560/026 , F01N2900/1402 , Y02A50/2325 , Y02T10/24 , Y02T10/47
摘要： Various systems and methods for detecting exhaust reductant injector degradation based on an exhaust NOx sensor are disclosed. In one example, degradation of the reductant injector is indicated when an actual NOx sensor output differs from an expected NOx sensor output by more than a threshold amount under engine off conditions.
摘要翻译： 公开了用于基于排气NOx传感器检测排气还原剂喷射器劣化的各种系统和方法。 在一个示例中，当在发动机关闭条件下实际的NOx传感器输出与期望的NOx传感器输出不同于阈值量时，指示还原剂喷射器的劣化。
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公开(公告)号：US20230112942A1
公开(公告)日：2023-04-13
申请号：US17450247
申请日：2021-10-07
摘要： Methods and systems are provided for adjusting an ammonia (NH3) sensor output using readings of a nitrogen oxide (NOx) sensor, the NOx sensor having a sensitivity factor to NH3. In one example, a method may include determining and updating a gain value of the NH3 sensor during zero NOx conditions to be used to calculate a corrected NH3 sensor output value, and determining and updating an offset value of the NH3 sensor during zero NH3 conditions to be used to zero the NH3 sensor during zero NOx conditions.
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公开(公告)号：US20200256224A1
公开(公告)日：2020-08-13
申请号：US16273967
申请日：2019-02-12
IPC分类号： F01M13/00
摘要： Methods and systems are provided for indicating crankcase breach due to disconnection of a crankcase vent tube from an engine on a clean air side or broken crankcase vent tube. In one example, a maximum possible change in crankcase vent tube pressure is estimated for each pedal transient of a drive cycle. The change for a plurality of transients in averaged and compared to a threshold to identify vent tube disconnection.
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