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公开(公告)号：US5495774A
公开(公告)日：1996-03-05
申请号：US223522
申请日：1994-04-05
IPC分类号： B60G17/019 , G01L3/10 , G01L3/02
CPC分类号： G01L3/102 , B60G17/019 , G01L3/105 , B60G2204/11 , B60G2400/30 , B60G2400/60 , B60G2400/91 , B60G2401/172 , B60G2600/602 , B60G2600/604 , B60G2800/802
摘要： Disclosed are a method and apparatus for minimizing or eliminating the effect of air gap variation on the output signal of a magnetostrictive stress/torque signal. An RLC drive circuit is utilized by choosing appropriate circuit parameters and drive frequency such that the flux reducing effect from increasing air gap due to increase in magnetic reluctance is offset by a flux increasing effect from a concomitant reduction in eddy currents. The invention is particularly suited to cross design magnetostrictive sensors and to automotive engine diagnostics applications such as misfire, knock, and roughness detection.
摘要翻译： 公开了一种用于最小化或消除气隙变化对磁致伸缩应力/转矩信号的输出信号的影响的方法和装置。 通过选择适当的电路参数和驱动频率来利用RLC驱动电路，使得由于磁阻增加而增加的气隙的磁通减小效应被伴随涡流减少的磁通增加效应所抵消。 本发明特别适用于交叉设计磁致伸缩传感器和汽车发动机诊断应用，例如失火，敲击和粗糙度检测。
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公开(公告)号：US5313826A
公开(公告)日：1994-05-24
申请号：US74861
申请日：1993-06-10
IPC分类号： F02D45/00 , B60G17/019 , F02P17/12 , G01D3/028 , G01L3/10 , G01L23/22 , G01M15/04 , G01M15/00
CPC分类号： G01D3/028 , B60G17/019 , G01L23/223 , G01L3/102 , G01L3/105 , G01M15/042 , B60G2204/11 , B60G2400/30 , B60G2400/60 , B60G2400/91 , B60G2401/172 , B60G2600/602 , B60G2600/604 , B60G2800/802 , Y10S73/02
摘要： A method and apparatus for comparing torsional stress/strain states of a power transmitting member of an internal combustion engine to detect an abnormal combustion condition, including misfire, knock or roughness. Statistical processing steps may be used to detect an abnormal combustion event including: calculating a mean and standard deviation for a set of signals related to the torsional stress induced in the power transmitting member, calculating a difference between a later signal and the mean, calculating a ratio of the difference to the standard deviation, and comparing the ratio to a threshold. The ratio so obtained from a given cylinder may further be compared with one or more other such ratios from other cylinders. In other words, the autocorrelation and/or cross-correlation techniques may be used. A magnetostrictive sensor may preferably be used to obtain the signals relating to the torsional stress in the power transmitting member, such as the engine crankshaft. In addition, the magnetostrictive sensor may include windings to cancel induced electromagnetic interference signals. The magnetostrictive sensor may also generate signals relating to the position of the power transmitting member in addition to the torsional stress in the power transmitting member. Spatial integration techniques may be used to obtain torsional stress/strain signals which are independent of the rotational speed of the power transmitting member. Spatial integration may be performed using variable amplifiers, variable attenuators, switched capacitors or other techniques.
摘要翻译： PCT No.PCT / US91 / 09280 Sec。 371日期：1993年6月10日 102（e）1993年6月10日PCT 1991年12月10日PCT。一种用于比较内燃机的动力传递部件的扭转应力/应变状态以检测异常燃烧状态的方法和装置，包括失火，敲击 或粗糙度。 可以使用统计处理步骤来检测异常燃烧事件，包括：计算与在动力传递构件中感应的扭转应力相关的一组信号的平均值和标准偏差，计算稍后信号和平均值之间的差，计算 差值与标准差的比值，并将该比率与阈值进行比较。 从给定气缸获得的比例可以进一步与来自其它气缸的一个或多个其它这样的比率进行比较。 换句话说，可以使用自相关和/或互相关技术。 优选地，可以使用磁致伸缩传感器来获得与动力传递部件（例如发动机曲轴）中的扭转应力有关的信号。 此外，磁致伸缩传感器可以包括用于消除诱导的电磁干扰信号的绕组。 磁致伸缩传感器除了动力传递部件中的扭转应力之外，还可产生与动力传递部件的位置有关的信号。 可以使用空间积分技术来获得与动力传递构件的旋转速度无关的扭转应力/应变信号。 可以使用可变放大器，可变衰减器，开关电容器或其他技术来执行空间积分。
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公开(公告)号：US5269178A
公开(公告)日：1993-12-14
申请号：US720240
申请日：1991-06-24
IPC分类号： F02D45/00 , B60G17/019 , F02P17/12 , G01D3/028 , G01L3/10 , G01L23/22 , G01M15/04 , G01L01/12 , G01L03/00 , G01L05/13 , G01M15/00
CPC分类号： G01D3/028 , B60G17/019 , G01L23/223 , G01L3/102 , G01L3/105 , G01M15/042 , B60G2204/11 , B60G2400/30 , B60G2400/60 , B60G2400/91 , B60G2401/172 , B60G2600/602 , B60G2600/604 , B60G2800/802 , Y10S73/02
摘要： Disclosed are a method and apparatus for comparing torsional stress/strain states of a power transmitting member of an internal combustion engine to detect an abnormal combustion condition, including misfire, knock or roughness. Statistical processing steps may be used to detect an abnormal combustion event including: calculating a mean and standard deviation for a set of signals related to the torsional stress induced in the power transmitting member, calculating a difference between a later signal and the mean, calculating a ratio of the difference to the standard deviation, and comparing the ratio to a threshold. The ratio so obtained from a given cylinder may further be compared with one or more other such ratios from other cylinders. A magnetostrictive sensor may preferably be used to obtain the signals relating to the torsional stress in the power transmitting member, such as the engine crankshaft. In addition, the magnetostrictive sensor may include windings to cancel induced electromagnetic interference signals.
摘要翻译： 公开了一种用于比较内燃机的动力传递部件的扭转应力/应变状态以检测异常燃烧状态（包括失火，爆震或粗糙）的方法和装置。 可以使用统计处理步骤来检测异常燃烧事件，包括：计算与在动力传递构件中感应的扭转应力相关的一组信号的平均值和标准偏差，计算稍后信号和平均值之间的差，计算 差值与标准差的比值，并将该比率与阈值进行比较。 从给定气缸获得的比例可以进一步与来自其它气缸的一个或多个其它这样的比率进行比较。 优选地，可以使用磁致伸缩传感器来获得与动力传递部件（例如发动机曲轴）中的扭转应力有关的信号。 此外，磁致伸缩传感器可以包括用于消除诱导的电磁干扰信号的绕组。
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