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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：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：US5325711A
公开(公告)日：1994-07-05
申请号：US88296
申请日：1993-07-06
CPC分类号： F02D41/1495 , F02D41/2458 , F02D41/2474
摘要： Method, for controlling fuel supply to an internal combustion engine utilizing a modulated air-fuel signal having a modified square-wave waveform, of monitoring operation of an oxygen sensor for sensing engine exhaust gas oxygen level. The method includes generating the modulated air-fuel signal having the modified square-wave waveform designed to produce a particular engine exhaust response for interrogating the oxygen sensor, and operating the engine based on the modulated air-fuel signal. The oxygen sensor produces an associated output signal in response to sensed exhaust gas oxygen levels. The method also includes processing the output signal of the oxygen sensor associated with the particular engine response so as to determine the operating condition of the oxygen sensor and to verify acceptable test conditions.
摘要翻译： 用于利用具有改进的方波波形的调制空气燃料信号来控制对内燃机的燃料供给的方法，监测用于感测发动机废气氧气水平的氧传感器的操作。 该方法包括生成具有修改的方波波形的经调制的空气 - 燃料信号，该波形被设计成产生用于询问氧传感器的特定的发动机排气响应，以及基于经调制的空气 - 燃料信号来操作发动机。 氧传感器响应于感测到的废气氧气水平产生相关联的输出信号。 该方法还包括处理与特定发动机响应相关联的氧传感器的输出信号，以便确定氧传感器的操作状态并验证可接受的测试条件。
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公开(公告)号：US5282360A
公开(公告)日：1994-02-01
申请号：US968937
申请日：1992-10-30
CPC分类号： F02D41/1441 , F02D41/1477 , F02D41/1489
摘要： An exhaust gas oxygen sensor is used to control the air/fuel ratio of an internal combustion engine in combination with an electronic engine control. The exhaust gas oxygen sensor is positioned in the exhaust stream flow from the engine. The electronic engine control utilizes different air/fuel ratio feedback strategies depending upon whether the signal output from the exhaust gas oxygen sensor is saturated indicating a rich air/fuel ratio, saturated indicating a lean air/fuel ratio or operating in a linear region.
摘要翻译： 废气氧传感器用于与电子发动机控制相结合地控制内燃机的空燃比。 废气氧传感器位于来自发动机的排气流中。 电子发动机控制利用不同的空气/燃料比反馈策略，取决于从排气氧传感器输出的信号是否饱和，表示富空燃比，饱和表示稀空燃比或在线性区域运行。
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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：US5099647A
公开(公告)日：1992-03-31
申请号：US722797
申请日：1991-06-28
申请人： Douglas R. Hamburg
发明人： Douglas R. Hamburg
CPC分类号： F01N11/007 , F01N2550/02 , Y02T10/47
摘要： An engine air/fuel control and catalyst monitoring means includes a first EGO sensor positioned upstream of a catalyst and a second EGO sensor positioned downstream of the catalyst. Outputs from both EGO sensors are applied to a complementary filter set. The output from the upstream EGO sensor is applied to a high pass filter section and the output from the downstream EGO sensor is applied to a low pass filter section. The summer receives inputs from each of the high pass and low pass filter sections and provides an output to a feedback controller which in turn controls a fuel metering system applying fuel to the engine. The downstream EGO sensor also provides a signal indicative of the efficiency of the catalyst.
摘要翻译： 发动机空气/燃料控制和催化剂监测装置包括位于催化剂上游的第一EGO传感器和位于催化剂下游的第二EGO传感器。 来自两个EGO传感器的输出都应用于互补滤波器组。 来自上游EGO传感器的输出被施加到高通滤波器部分，并且来自下游EGO传感器的输出被施加到低通滤波器部分。 夏天接收来自每个高通滤波器部分和低通滤波器部分的输入，并且向反馈控制器提供输出，反馈控制器又控制向发动机施加燃料的燃料计量系统。 下游EGO传感器还提供了指示催化剂效率的信号。
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公开(公告)号：US5090388A
公开(公告)日：1992-02-25
申请号：US620952
申请日：1990-12-03
CPC分类号： F02D41/1487 , F02D41/0045 , F02D41/2461 , F02M25/08 , F02D41/0042
摘要： A system and method for controlling operation of an engine wherein a fuel vapor recovery system is coupled between an air/fuel intake and a fuel supply system. An air/fuel ratio indication is provided by a proportional plus integral feedback controller coupled to a two-state exhaust gas oxygen sensor. In response to the air/fuel ratio indication and a measurement of inducted air flow, a base fuel command is generated. To compensate for purging of fuel vapors, a reference air/fuel ratio is subtracted from the air/fuel ratio indication and the resulting error signal generated. This compensation factor represents a learned value which is directly related to fuel vapor concentration, and it is subtracted from the base fuel command to correct for induction of fuel vapors.
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8.发明授权Solenoid duty cycle modulation for dynamic control of refueling vapor purge transient flow 失效用于动态控制加油蒸气吹扫瞬态流的电磁阀占空比调制
公开(公告)号：US4677956A
公开(公告)日：1987-07-07
申请号：US756611
申请日：1985-07-19
申请人： Douglas R. Hamburg
发明人： Douglas R. Hamburg
CPC分类号： F02M25/08 , F02D41/004 , F02D41/0045 , F02D41/0032
摘要： Fuel vapors are purged from a vapor storage canister to the intake of an internal combustion engine by inducting air into the vapor canister, modulating the purge flow of an air and fuel vapor mixture from the canister, and establishing a predetermined magnitude of combustion exhaust emissions by gradually changing the magnitude of a transient flow between no purge flow and a full purge flow so that the amount of combustion exhaust emissions is maintained below the predetermined magnitude.
摘要翻译： 燃料蒸气通过将空气引入蒸汽罐中，从蒸气储存罐中吹扫到内燃机的入口，调节来自罐的空气和燃料蒸气混合物的吹扫流量，并通过以下方式建立预定量级的燃烧废气排放： 逐渐改变无吹扫流量和全净化流量之间的瞬时流量的大小，使得燃烧废气排放量维持在预定量级以下。
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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：US5291673A
公开(公告)日：1994-03-08
申请号：US994013
申请日：1992-12-21
IPC分类号： F02D41/14
CPC分类号： F02D41/1441 , F02D41/1494
摘要： An exhaust gas sensor system for use with an internal combustion engine having an exhaust conduit and a catalytic converter. The system includes an exhaust gas oxygen sensor, temperature sensor, and signal conditioner. The exhaust gas oxygen sensor is positioned on the conduit, downstream of the catalytic converter, and provides an oxygen level signal. The temperature sensor is also downstream of the catalytic converter, sensing the temperature of the oxygen sensor. A signal conditioner receives outputs from both the exhaust gas oxygen sensor and the temperature sensor. The oxygen level signal from the oxygen sensor is adjusted, according to the temperature sensed by the temperature sensor, to provide a more accurate oxygen level signal to other components of the engine such as, for example, an air-fuel controller.
摘要翻译： 一种用于具有排气导管和催化转化器的内燃机的废气传感器系统。 该系统包括废气氧传感器，温度传感器和信号调节器。 排气氧传感器位于催化转化器下游的导管上，并提供氧气水平信号。 温度传感器也在催化转化器的下游，感测氧气传感器的温度。 信号调节器接收来自排气氧传感器和温度传感器的输出。 根据温度传感器感测到的温度，调节来自氧气传感器的氧气水平信号，以向发动机的其它部件（例如空气 - 燃料控制器）提供更准确的氧气水平信号。
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