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公开(公告)号：US5497618A
公开(公告)日：1996-03-12
申请号：US315737
申请日：1994-09-30
CPC分类号： F02D41/1476 , F01N11/007 , F02D41/1441 , F01N2550/02 , Y02T10/47
摘要： A control system and method maintains engine air/fuel operation near stoichiometry (104-178) in response to exhaust gas oxygen sensors (44,52) positioned both upstream and downstream of a catalytic converter (50). A non-catalytic exhaust gas oxygen sensor (54), having non-catalytic electrode, is positioned downstream of the converter (50) and its output voltage (Vo) monitored. Pumping current (Ip) is applied to an electrode of the non-catalytic sensor at a predetermined magnitude (IPREF) from a pumping current generator (56). When the output voltage (Vo) is detected at a predetermined high voltage range (302-318) an indication of degraded converter efficiency is provided (320).
摘要翻译： 响应于位于催化转化器（50）的上游和下游的排气氧传感器（44,52），控制系统和方法维持接近化学计量（104-178）的发动机空气/燃料操作。 具有非催化电极的非催化废气氧传感器（54）位于转换器（50）的下游，并且监测其输出电压（Vo）。 抽吸电流（Ip）以来自泵送电流发生器（56）的预定量值（IPREF）施加到非催化传感器的电极。 当在预定的高电压范围（302-318）检测到输出电压（Vo）时，提供降级转换器效率的指示（320）。
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公开(公告)号：US5452576A
公开(公告)日：1995-09-26
申请号：US288093
申请日：1994-08-09
申请人： Douglas R. Hamburg , Jeffrey A. Cook , Richard E. Soltis , Eleftherios M. Logothetis , Jacobus H. Visser
发明人： Douglas R. Hamburg , Jeffrey A. Cook , Richard E. Soltis , Eleftherios M. Logothetis , Jacobus H. Visser
CPC分类号： F02D41/1453 , F02D41/1441 , F02D41/146 , F02D41/1456
摘要： An engine air/fuel control system (8) and method for controlling an engine (28) coupled to a catalytic converter (50) and for providing a measurement of engine emissions (202-296). Nitrogen oxides concentration, hydrocarbon concentration, and carbon monoxide concentration of exhaust gases downstream of the converter are measured (46, 54, and 52). Each concentration measurement is averaged for the speed load cell in which such measurement occurred (244-256). Each concentration average measurement is converted to a measurement of mass emissions emitted during a test cycle (268-284). Fuel delivered to the engine is corrected by a feedback variable (104-134, 158-178) derived from both an exhaust gas oxygen sensor (44) positioned upstream of the converter and the three sensors positioned downstream of the converter (46, 52, 54). A measurement of emissions in response to the averaged mass measurements of emission concentration downstream of the converter is also provided (278-296).
摘要翻译： 一种发动机空气/燃料控制系统（8）和用于控制与催化转化器（50）耦合并用于提供发动机排放物的测量的发动机（28）的方法（202-296）。 测量转炉下游排气的氮氧化物浓度，烃浓度和一氧化碳浓度（46,54和52）。 对于发生这种测量的速度传感器（244-256），对每个浓度测量进行平均。 每个浓度平均测量值转换为在测试周期内排放的质量排放的测量（268-284）。 通过从位于转换器上游的排气氧传感器（44）和位于转换器（46,52）的下游的三个传感器得到的反馈变量（104-134,158-178）来校正输送到发动机的燃料， 54）。 还提供了响应于转换器下游发射浓度的平均质量测量的排放测量（278-296）。
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公开(公告)号：US5268086A
公开(公告)日：1993-12-07
申请号：US741378
申请日：1991-08-07
IPC分类号： F01N11/00 , G01N27/407 , G01N27/417
CPC分类号： F01N11/007 , G01N27/407 , G01N27/417 , F01N2550/02 , Y02T10/47
摘要： A method of monitoring, while on board an automotive vehicle, one or more of catalyst performance, engine misfire, and combustion quality, the vehicle having an internal combustion engine equipped with a catalyst for converting noxious emissions of the engine, comprising: (i) exposing at least one pair of EGO sensors to substantially the same emissions either exiting from the engine or from the catalyst, one of the EGO sensors having its electrode highly catalytic, and the other sensor having its electrode low-to-noncatalytic; (ii) comparing the outputs of the sensor electrodes (amplitude, frequency, or phase shift) to determine if there is a sufficient differential to indicate a misfire or poor combustion in the case of the sensors being located downstream of the engine exhaust but upstream of the catalyst, or indicating poor catalyst efficiency in the case of the sensors being placed substantially immediately downstream of the catalyst. The catalyst may be a three-way catalyst (or an oxidation catalyst). The sensors may be of the EGO, HEGO, or UEGO types. Two pairs of sensors may be used, a first pair being placed substantially immediately upstream of the catalyst and the second pair being placed substantially immediately downstream of the catalyst, the pairs of EGO sensors being incorporated into a closed-loop feedback control of the engine fuel control system.
摘要翻译： 一种在机载车上进行一种或多种催化剂性能，发动机失火和燃烧质量的监测的方法，所述车辆具有配备有用于转换发动机有害排放物的催化剂的内燃机，其包括：（i） 将至少一对EGO传感器暴露于从发动机或从催化剂离开的基本上相同的排放物，EGO传感器之一具有高度催化的电极，另一传感器具有其电极低至非催化剂; （ii）比较传感器电极的输出（振幅，频率或相移）以确定在传感器位于发动机排气下游的情况下是否存在足够的差异以指示发动机失火或燃烧不良 催化剂，或者在传感器基本上立即放置在催化剂的下游的情况下表明催化剂效率差。 催化剂可以是三元催化剂（或氧化催化剂）。 传感器可以是EGO，HEGO或UEGO类型。 可以使用两对传感器，第一对基本上立即放置在催化剂的上游，并且第二对基本上立即放置在催化剂的下游，这对EGO传感器被并入发动机燃料的闭环反馈控制 控制系统。
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公开(公告)号：US5383333A
公开(公告)日：1995-01-24
申请号：US132267
申请日：1993-10-06
CPC分类号： F02D41/1476 , F02D41/1441
摘要： A system for maintaining engine air/fuel operation within the efficiency window of a catalytic converter. Fuel delivered to the engine is adjusted in response to a step change in an output of an exhaust gas oxygen sensor positioned upstream of the converter. The step change is shifted in response to an error signal derived from a downstream emissions sensor.
摘要翻译： 一种用于在催化转化器的效率窗口内维持发动机空气/燃料运行的系统。 响应于位于转换器上游的排气氧传感器的输出的阶跃变化来调节输送到发动机的燃料。 响应于从下游发射传感器得到的误差信号，阶跃变化被移动。
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公开(公告)号：US5379590A
公开(公告)日：1995-01-10
申请号：US132407
申请日：1993-10-06
CPC分类号： F02D41/1476 , F02D41/1441
摘要： A control system for maintaining engine air/fuel operation within the efficiency window of a catalytic converter. An exhaust gas oxygen sensor having a step change between first and second output states and positioned downstream of the converter. A step change in the downstream sensor output is initialized to an initial air/fuel ratio by pumping current through one of the sensing electrodes of the downstream sensor. An emission control signal is derived from the initialized downstream sensor output to bias an air/fuel feedback loop.
摘要翻译： 一种用于在催化转化器的效率窗口内维持发动机空气/燃料运行的控制系统。 一种废气氧传感器，其具有在第一和第二输出状态之间并位于转换器下游的台阶变化。 下游传感器输出中的阶跃变化通过泵送通过下游传感器的感测电极之一的电流而初始化为初始空气/燃料比。 从初始化的下游传感器输出导出排放控制信号以偏置空气/燃料反馈回路。
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6.发明授权Method and apparatus for determining the hydrocarbon conversion efficiency of a catalytic converter 失效用于确定催化转化器的烃转化效率的方法和装置
公开(公告)号：US5265417A
公开(公告)日：1993-11-30
申请号：US1599
申请日：1993-01-07
申请人： Jacobus H. Visser , Richard E. Soltis , Eleftherios M. Logothetis , Douglas R. Hamburg , Jeffrey A. Cook , Margherita Zanini-Fisher
发明人： Jacobus H. Visser , Richard E. Soltis , Eleftherios M. Logothetis , Douglas R. Hamburg , Jeffrey A. Cook , Margherita Zanini-Fisher
CPC分类号： F01N11/00 , F01N2550/02 , Y02T10/47
摘要： Disclosed is a method and apparatus for determining the hydrocarbon conversion efficiency of a catalytic converter used in conjunction with an internal combustion (IC) engine to reduce the pollutants contained in the IC exhaust gas comprising the steps of: (a) determining the hydrocarbon content of the IC exhaust gas prior to its entry into the catalytic converter by sampling the exhaust and passing the sample to a catalytic differential calorimetric sensor; (b) contacting the catalyst in the converter with the IC exhaust; (c) determining the hydrocarbon content of the exhaust leaving the catalytic converter by sampling the exhaust and passing the sample to the catalytic differential calorimetric sensor; and (d) comparing the hydrocarbon contents of the exhaust samples from steps (a) and (c) and thereby determining the hydrocarbon conversion efficiency of the catalyst in the converter.
摘要翻译： 公开了一种用于确定与内燃（IC）发动机结合使用的催化转化器的烃转化效率以减少包含在IC排气中的污染物的方法和装置，包括以下步骤：（a）确定 IC废气在进入催化转化器之前通过抽样排气并将样品传送到催化差示量热传感器; （b）将转化器中的催化剂与IC排气接触; （c）通过对排气进行取样并将样品传送到催化差示量热传感器来测定离开催化转化器的废气的烃含量; 和（d）比较来自步骤（a）和（c）的排气样品的烃含量，从而确定转化器中催化剂的烃转化效率。
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7.发明授权Engine air/fuel control system with catalytic converter and exhaust gas oxygen sensor monitoring 失效发动机空气/燃油控制系统带催化转化器和废气氧传感器监控
公开(公告)号：US5499500A
公开(公告)日：1996-03-19
申请号：US358509
申请日：1994-12-19
CPC分类号： F02D41/1476 , F01N11/007 , F02D41/1441 , F01N2550/02 , Y02T10/47
摘要： An engine air/fuel control system is shown (300-428) responsive to a feedback variable derived (410-428) from an exhaust gas oxygen sensor (16) positioned upstream of a catalytic converter (20). A non-catalytic exhaust gas oxygen sensor (24) having a non-catalytic electrode (490) positioned in the engine exhaust downstream of the converter (20) is coupled to a current pumping circuit (28). Current is pumped into an electrode of the downstream sensor (24) shifting its output step change towards richer air/fuel ratios. Pumping current is gradually increased in amplitude until the downstream sensor (24) incurs a change in its output state (602-634). The pumping current occurring at the time of such change in output states provides a measurement of catalyst efficiency.
摘要翻译： 示出了响应于位于催化转化器（20）上游的排气氧传感器（16）导出（410-428）的反馈变量的发动机空气/燃料控制系统（300-428）。 具有位于转换器（20）下游的发动机排气中的非催化电极（490）的非催化废气氧传感器（24）被耦合到电流泵送电路（28）。 电流被泵送到下游传感器（24）的电极中，将其输出步骤变化转换到更加丰富的空气/燃料比。 抽吸电流的幅度逐渐增加，直到下游传感器（24）引起其输出状态的改变（602-634）。 在输出状态的这种变化时发生的泵送电流提供了催化剂效率的测量。
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公开(公告)号：US5465697A
公开(公告)日：1995-11-14
申请号：US350437
申请日：1994-12-06
CPC分类号： F02D41/1476 , F02D41/06 , F02D41/1496 , F02P5/045 , F02P5/1506 , F02D41/1456 , Y02T10/46
摘要： An air/fuel control system (8) generates a fuel command (100) for fuel delivery to the engine (28) based upon at least an amount of air inducted into the engine. This fuel command is trimmed by a feedback variable derived (240-282) from an exhaust gas oxygen sensor (44) when feedback control is initiated. Feedback control is commenced when the peak-to-peak output of the sensor is less than a threshold value (122-128) while pumping current applied to a sensor electrode is modulated (122-128). Modulation is then removed but the pumping current is maintained to shift the sensor output to a preselected lean air/fuel ratio (128). Lean air/fuel feedback control continues until the converter is warmed (130-140).
摘要翻译： 空气/燃料控制系统（8）基于至少一定量的引入发动机的空气产生用于向发动机（28）输送燃料的燃料指令（100）。 当启动反馈控制时，通过来自排气氧传感器（44）的反馈变量（240-282）来修整该燃料指令。 当传感器电极的峰值输出小于阈值（122-128）时，反馈控制开始，同时调制施加到传感器电极的泵浦电流（122-128）。 然后去除调制，但是保持泵送电流以将传感器输出移动到预选的稀薄空气/燃料比（128）。 精益空气/燃料反馈控制继续，直到转换器加热（130-140）。
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9.发明授权
公开(公告)号：US5392599A
公开(公告)日：1995-02-28
申请号：US179271
申请日：1994-01-10
CPC分类号： F02D41/2458 , F02D41/1476 , F02D41/2474
摘要： Engine air/fuel ratio is controlled in response to a comparison of an exhaust gas oxygen sensor output with a reference value. A correction voltage is generated which is related to a change in the midpoint between saturated output states of the sensor during a test period in which engine air/fuel operation is first forced rich and then forced lean of a preselected air/fuel ratio. The sensor output amplitude is shifted with the correction voltage to reduce variations between the reference value and the midpoint.
摘要翻译： 响应于排气氧传感器输出与参考值的比较来控制发动机空气/燃料比。 产生校正电压，该校正电压与在发动机空气/燃料操作首先被强制浓缩然后强制倾斜预选空气/燃料比的测试期间传感器的饱和输出状态之间的中点的变化相关。 传感器输出幅度与校正电压一起移动，以减小参考值和中点之间的变化。
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公开(公告)号：US5375415A
公开(公告)日：1994-12-27
申请号：US158330
申请日：1993-11-29
CPC分类号： F02D41/1476
摘要： An engine air/fuel feedback control system adjusts the engine air/fuel ratio in response to a modified output of an exhaust gas oxygen sensor. A sensor output is compared to a reference at its nominal midpoint to develop a two-state signal indicating operation rich or lean of stoichiometry. This two-state or step output is shifted towards the peak efficiency window of a catalytic converter by pumping current through a sensor electrode in response to an error signal derived from a downstream sensor. Shifts in the upstream sensor amplitude caused by current pumping are corrected by a correction factor which is adaptively learned during a test cycle.
摘要翻译： 发动机空气/燃料反馈控制系统响应于废气氧传感器的改变的输出来调节发动机空气/燃料比。 将传感器输出与其标称中点处的参考值进行比较，以产生指示操作浓度或化学计量偏差的双态信号。 响应于从下游传感器导出的误差信号，通过将电流泵送通过传感器电极，将该两状态或步进输出朝向催化转换器的峰值效率窗口移动。 由电流泵浦引起的上游传感器振幅的变化通过在测试周期中自适应地学习的校正因子来校正。
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