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公开(公告)号：US5515826A
公开(公告)日：1996-05-14
申请号：US497328
申请日：1995-06-30
IPC分类号： F02D41/14
CPC分类号： F02D41/2458
摘要： An engine air/fuel control system modulates the flow of fuel delivered to the engine with a modulation signal (100, 144) The feedback variable generated (210-228) from a two-state exhaust gas oxygen sensor (16) corrects the fuel flow (156). During each of a plurality of pre-determined intervals, the fuel flow is biased with a rich offset (342). Amplitude of the modulation signal is corrected by a difference between the feedback variable generated during two successive occurrences of the predetermined interval (346-378).
摘要翻译： 发动机空气/燃料控制系统用调制信号（100,144）调节输送到发动机的燃料流。来自两状态排气氧传感器（16）的产生的反馈变量（210-228）校正燃料流量 （156）。 在多个预定间隔期间的每一个期间，燃料流以富偏移（342）偏置。 通过在预定间隔（346-378）的两次连续出现期间产生的反馈变量之间的差来校正调制信号的幅度。
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公开(公告)号：US5579746A
公开(公告)日：1996-12-03
申请号：US485064
申请日：1995-06-08
IPC分类号： F02D41/14
CPC分类号： F02D41/1477
摘要： An air/fuel control system for an engine (28) provides an air/fuel indicating signal linearly related to average engine air/fuel operation from a two-state exhaust gas oxygen sensor (44). Fuel delivered to the engine is modulated with a periodic signal (144). A reference value corresponding to a desired air/fuel ratio is subtracted from a rolling average of the exhaust gas oxygen sensor output to provide an error signal (148-152). A feedback variable (FV) for adjusting the engine air/fuel ratio is generated from a proportional plus integral controller having the error signal as its input (156). In this manner, average engine air/fuel ratio is maintained at the desired air/fuel ratio and the rolling average of the exhaust gas oxygen sensor output provides an air/fuel indicating signal.
摘要翻译： 用于发动机（28）的空气/燃料控制系统从两状态排气氧传感器（44）提供与平均发动机空气/燃料操作线性相关的空气/燃料指示信号。 输送到发动机的燃料用周期信号（144）进行调制。 从排气氧传感器输出的滚动平均值中减去与期望的空气/燃料比相对应的基准值，以提供误差信号（148-152）。 用于调整发动机空燃比的反馈变量（FV）由具有误差信号作为其输入的比例积分控制器产生（156）。 以这种方式，平均发动机空气/燃料比保持在期望的空气/燃料比，并且排气氧传感器输出的滚动平均值提供空气/燃料指示信号。
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公开(公告)号：US5582150A
公开(公告)日：1996-12-10
申请号：US596855
申请日：1996-02-05
CPC分类号： F02D41/2458 , F02D41/068 , F02P5/1506 , F02P5/045 , Y02T10/46
摘要： An air/fuel control system for an engine (10) provides an air/fuel indicating signal linearly related to average engine air/fuel operation from a two-state exhaust gas oxygen sensor (76). Fuel delivered to the engine is modulated with a periodic or modulation signal (244). The modulation signal is offset in either a fuel increasing or a fuel decreasing direction when the air/fuel indicating signal is respectively saturated at either a lean or a rich value (394-420).
摘要翻译： 一种用于发动机（10）的空气/燃料控制系统从两状态排气氧传感器（76）提供与平均发动机空气/燃料运行线性相关的空气/燃料指示信号。 输送到发动机的燃料用周期性或调制信号（244）进行调制。 当空气/燃料指示信号分别以贫或富值（394-420）饱和时，调制信号在燃料增加或燃料减少方向上偏移。
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公开(公告)号：US5511526A
公开(公告)日：1996-04-30
申请号：US497274
申请日：1995-06-30
CPC分类号： F02D41/2458
摘要： An air/fuel control system for an engine (28) provides an air/fuel indicating signal linearly related to average engine air/fuel operation from a two-state exhaust gas oxygen sensor (44). Fuel delivered to the engine is modulated with a periodic signal (144). Adaptive feedback control (steps 200-280) adaptively learns a desired amplitude for the periodic signal to generate the air/fuel indicating signal with desired sensitivity and operating range.
摘要翻译： 用于发动机（28）的空气/燃料控制系统从两状态排气氧传感器（44）提供与平均发动机空气/燃料操作线性相关的空气/燃料指示信号。 输送到发动机的燃料用周期信号（144）进行调制。 自适应反馈控制（步骤200-280）自适应地学习周期信号的期望幅度以产生具有期望的灵敏度和操作范围的空气/燃料指示信号。
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公开(公告)号：US5566663A
公开(公告)日：1996-10-22
申请号：US297085
申请日：1994-10-17
CPC分类号： F02D41/1484 , F02D41/1486 , F02D41/1456
摘要： An engine air/fuel control system and method is provided having feedback control responsive to an exhaust gas oxygen sensor. A fuel command responsive to the EGO sensor is modulated (312) and the modulation disabled in response to detection of an air/fuel transient period (502-510, 610). In addition, feedback control gain is increased (514, 614) and the modulation signal held at a value opposite the state of the EGO sensor occurring upon initiation of the air/fuel transient period (510, 610). An indication is provided that the air/fuel transient is terminated when the EGO sensor switching frequency resumes a normal condition (522-528, 622-628). Modulation is thereafter resumed and the feedback gain restored (532-538, 632-638).
摘要翻译： 提供具有响应于排气氧传感器的反馈控制的发动机空气/燃料控制系统和方法。 响应于EGO传感器的燃料指令被调制（312）并且响应于空气/燃料过渡时段（502-510,610）的检测而禁用调制。 此外，反馈控制增益增加（514,614），并且调制信号保持在与空气/燃料过渡时段（510,610）开始时发生的与EGO传感器状态相反的值。 提供了当EGO传感器切换频率恢复正常状态时（522-528,622-628）终止空气/燃料瞬态的指示。 此后恢复调制并恢复反馈增益（532-538,632-638）。
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公开(公告)号：US5370101A
公开(公告)日：1994-12-06
申请号：US131354
申请日：1993-10-04
IPC分类号： G01N27/409 , F02D41/14 , G01N27/26
CPC分类号： F02D41/1495
摘要： A fuel control system operating under closed-loop control senses the oxygen content of the combustion products of an internal combustion engine along with the engine angular velocity and air flow through the intake manifold. The fuel control system supplies an air/fuel modulation signal to modify a fueling value which is calculated as a function of the engine angular velocity and air flow. An oxygen sensor monitoring test is performed periodically to determine the efficacy of the oxygen sensor. The total switching time of the oxygen sensor, comprising the lean-to-rich and rich-to-lean switching times, is determined and checked against a range. If the total switching time is within the range then the difference between the lean-to-rich and rich-to-lean switching times, is determined and checked against a second range. If the difference is within the second range the oxygen sensor is determined to be operating effectively and the test is terminated. If the difference is outside of the second range, a compensation value is generated as a function of the difference in switching times. The monitoring test is performed a predetermined number of times and if at the end of the test the difference in switching times is still outside of the second range, the oxygen sensor is determined to be inoperative.
摘要翻译： 在闭环控制下操作的燃料控制系统感测内燃机的燃烧产物的氧含量以及发动机角速度和通过进气歧管的气流。 燃料控制系统提供空气/燃料调制信号以改变作为发动机角速度和空气流量的函数计算的加油值。 周期性地执行氧传感器监测测试以确定氧传感器的功效。 根据一个范围确定和检查氧传感器的总切换时间，包括贫富浓和富稀切换切换时间。 如果总切换时间在该范围内，那么在从第一范围到第二范围之间确定和检查贫富之间和富瘦切换时间之间的差异。 如果差异在第二范围内，则氧传感器被确定为有效地操作并且测试终止。 如果差值在第二范围之外，则产生作为切换时间差的函数的补偿值。 监视测试执行预定次数，如果在测试结束时，切换时间差仍在第二范围之外，则氧传感器被确定为不起作用。
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