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公开(公告)号：US5146885A
公开(公告)日：1992-09-15
申请号：US785166
申请日：1991-10-31
CPC分类号： F02D41/1475 , F02D41/1486
摘要： An air-fuel ratio control device for an engine, by which the air-fuel ratio of the air-fuel mixture supplied to the engine is changed. The device set the air-fuel ratio to a lean mixture when the engine load is lower than a set load value and predetermined set speed, and when the engine load become higher than the set load value, or the engine speed exceeds the set speed, the device switches the air-fuel ratio from a lean mixture to a rich mixture to obtain higher engine output. The set load value is varied in accordance with the engine speed such that it is reduced as the engine speed is increased.
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公开(公告)号：US4908765A
公开(公告)日：1990-03-13
申请号：US125618
申请日：1987-11-25
申请人： Nobuaki Murakami , Osamu Hirako
发明人： Nobuaki Murakami , Osamu Hirako
CPC分类号： F02D41/1486 , F02D41/1475 , F02D41/1456
摘要： Disclosed herein is an air/fuel ratio controller for an engine, which is equipped with a function to make the air/fuel ratio leaner in a light-load operation zone or the like of a lean burn engine. The controller is intended to improve the starting performance and acceleration feeling of the engine significantly. Upon generation of an acceleration command by a driver during lean burn of the engine at a lean air/fuel ratio, an air/fuel ratio enriching device is operated to set the air/fuel ratio of an air-fuel mixture, which is to be fed to the engine, at a level richer than the lean air/fuel ratio while an actually accelerated state continues in the engine from the time point of generation of the acceleration command.
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公开(公告)号：US4825838A
公开(公告)日：1989-05-02
申请号：US167118
申请日：1988-03-11
申请人： Minoru Osuga , Yoshishige Oyama
发明人： Minoru Osuga , Yoshishige Oyama
CPC分类号： F02D41/1486 , F02D41/1474 , F02D41/1479 , F02D41/1456
摘要： In an internal combustion engine, in which, during the lean-burn region of its operation, fuel supplied for the engine is controlled so as to make an acutal air/fuel ratio follow a predetermined lean air/fuel ratio, an air/fuel ratio control apparatus detects the amplitude of a pulsating component in an output voltage of an oxygen sensor. The pulsating component is caused by the occurence of a misfire. The control apparatus corrects a reference for the sensor output voltage in a feedback control of the air/fuel ratio in accordance with the detected amplitude of the pulsating component, whereby the stable operation of the engine can be secured irrespective of the aged change of the stable combustion limit of the engine.
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公开(公告)号：US4763629A
公开(公告)日：1988-08-16
申请号：US14266
申请日：1987-02-12
CPC分类号： F02D41/1486 , F02D41/1479 , F02D41/182 , F02D41/1456
摘要： An air-fuel ratio control system for an engine in which a fuel injection amount is calculated according to the engine operating conditions and is corrected according to the output of an air-fuel ratio sensor, comprises a base fuel injection amount calculating section for calculating a base fuel injection amount corresponding to the stoichiometric air-fuel ratio on the basis of the intake air amount, a target air-fuel ratio calculating section for calculating a target air-fuel ratio according to the engine operating condition, a reference value calculating section for calculating a reference value which represents the target air-fuel ratio and is submitted to comparison with the output of the air-fuel ratio sensor, a feedback correction coefficient calculating section for calculating a feedback coefficient according to the deviation of the output of the air-fuel ratio sensor from the reference value, and a final fuel injection amount calculating section which corrects the base fuel-injection amount on the basis of the ratio of the stoichiometric air-fuel ratio to the target air-fuel ratio and the feedback coefficient to obtain a final fuel injection amount.
摘要翻译： 一种用于发动机的空燃比控制系统，其中根据发动机运行条件计算燃料喷射量并根据空燃比传感器的输出进行校正，包括：基本燃料喷射量计算部， 基于进气量的与理论空燃比对应的基准燃料喷射量，根据发动机运转状态计算目标空燃比的目标空燃比计算部，基准值计算部， 计算表示目标空燃比的基准值，并与空燃比传感器的输出进行比较;反馈修正系数计算部，其根据空燃比传感器的输出的偏差来计算反馈系数; 燃料比传感器和基准燃料喷射量的最终燃料喷射量计算部 基于化学计量空燃比与目标空燃比的比率和反馈系数，以获得最终燃料喷射量。
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45.发明授权
公开(公告)号：US4725955A
公开(公告)日：1988-02-16
申请号：US730582
申请日：1985-05-06
CPC分类号： F02D41/1486 , F02P5/1502 , F02P5/1514 , F02D41/2422 , Y02T10/46
摘要： Disclosed is an engine having an air-fuel ratio control apparatus for obtaining various air-fuel ratios, the range of which is between the stoichiometric air-fuel ratio or lower than that ratio and the high air-fuel ratio providing a very lean air-fuel mixture. A plurality of ignition timing maps is provided, these maps having a respective order of priority determined by the air-fuel ratio. During operation of the engine, parameters substantially related to the air-fuel ratio ranges are detected, and a map having the highest order of priority is selected from the maps which meet the engine parameters. The ignition timing is calculated from the selected map.
摘要翻译： 公开了一种具有空燃比控制装置的发动机，其用于获得各种空燃比，其范围在理论空燃比或低于该比之间，高空燃比提供非常稀薄的空气 - 燃料混合物 提供了多个点火正时图，这些图具有由空燃比确定的各自的优先顺序。 在发动机运转期间，检测与空燃比范围基本相关的参数，并且从满足发动机参数的图中选择具有最高优先级顺序的地图。 从所选地图计算点火正时。
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公开(公告)号：US4699111A
公开(公告)日：1987-10-13
申请号：US797631
申请日：1985-11-13
申请人： Akimasa Yasuoka
发明人： Akimasa Yasuoka
CPC分类号： F02D41/0082 , F02D41/1443 , F02D41/1486
摘要： An air-fuel ratio control method for an internal combustion engine having a plurality of cylinders divided into at least two cylinder groups, wherein when each of the cylinder groups is in a first predetermined operating condition, the air-fuel ratio of a mixture being supplied to the each cylinder group is controlled in a feedback manner responsive to the output of corresponding one of at least two exhaust gas ingredient concentration sensors arranged in respective ones of at least two exhaust passage divided portions connected to respective cylinder groups, while when the each cylinder group is in a second predetermined operating condition, the air-fuel ratio of the mixture is controlled in an open loop mode corresponding to the second predetermined operating condition. When one cylinder group shifts from the first predetermined operating condition to the second predetermined operating condition, or vice versa, the air-fuel ratio for the one cylinder group is continually controlled in a control manner corresponding to one of the first and second predetermined operating conditions in which the engine was operating before the shift, until all the other cylinder groups shift to the other operating condition in which the on e cylinder group is operating after the shift.
摘要翻译： 一种用于内燃机的空燃比控制方法，其具有分成至少两个气缸组的多个气缸，其中当每个气缸组处于第一预定操作状态时，提供混合物的空燃比 响应于布置在连接到相应气缸组的至少两个排气通道分隔部分中的相应的排气成分浓度传感器中的相应一个排气成分浓度传感器的输出，反馈方式被控制到每个气缸组，而当每个气缸 组合处于第二预定操作状态，混合物的空燃比被控制为对应于第二预定操作条件的开环模式。 当一个气缸组从第一预定操作状态转移到第二预定操作状态，反之亦然时，一个气缸组的空燃比以对应于第一和第二预定操作条件之一的控制方式连续地控制 其中发动机在换档之前运行，直到所有其他气缸组转移到在变速后缸上组运行的另一操作状态。
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公开(公告)号：US4617901A
公开(公告)日：1986-10-21
申请号：US684495
申请日：1984-12-21
申请人： Yutaka Otobe , Akihiro Yamato
发明人： Yutaka Otobe , Akihiro Yamato
CPC分类号： F02D41/148 , F02D41/1486
摘要： A method of controlling the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine includes comparing the value of a signal indicative of the concentration of an exhaust gas ingredient with a predetermined reference value, detecting from the comparison result a first change in the air-fuel ratio of the mixture supplied to the engine from a value richer than a predetermined value to a value leaner than same, or a second change in the air-fuel ratio of the mixture from a value leaner than the predetermined value to a value richer than same, correcting the value of an air-fuel ratio control signal by increasing or decreasing same by a first predetermined correction value in response to the first change or the second change thus detected, and controlling the air-fuel ratio of the mixture in a feedback manner responsive to the value of the air-fuel ratio control signal thus corrected. A second predetermined correction value, in lieu of the first predetermined correction value, is applied to correction of the air-fuel ratio control signal in response to a selected one of the first change and the second change with a cycle a predetermined number of times as large as the fluctuation cycle of the exhaust gas ingredient concentration-indicative signal.
摘要翻译： 控制向内燃机供给的空气燃料混合物的空燃比的方法包括将表示废气成分浓度的信号的值与规定的基准值进行比较，从比较结果a 从提供给发动机的混合物的空燃比首先从比预定值更丰富的值改变为比其更稀的值，或者混合物的空燃比的第二变化是从比预定值更稀的值 值增加到比其更大的值，通过响应于如此检测到的第一变化或第二变化，将空燃比控制信号的值增加或减小第一预定校正值来校正空燃比控制信号的值，并且控制空燃比 以反馈方式响应于如此校正的空燃比控制信号的值。 代替第一预定校正值的第二预定校正值被应用于响应于所选择的第一变化和第二变化中的所选择的一个以预定次数的周期来校正空燃比控制信号 作为废气成分浓度指示信号的波动周期大。
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48.发明授权
公开(公告)号：US4535736A
公开(公告)日：1985-08-20
申请号：US601341
申请日：1984-04-17
申请人： Mitsuharu Taura , Toshiaki Mizuno
发明人： Mitsuharu Taura , Toshiaki Mizuno
CPC分类号： F02D41/1486 , F02D41/08
摘要： Disclosed is a method of controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine. The method employs a feedback control in which the control is made to maintain the air-fuel ratio at the stoichiometric level in accordance with the air-fuel ratio read through the detection of a component of the exhaust gas and, at least during the idling of the engine after the warming up of the same, a lean control in which the control is made to maintain the air-fuel ratio at the leaner side of the stoichiometric level. The lean control is allowed when the mean value of the engine speed over a predetermined period is greater than a predetermined reference value during the idling after warming up of the engine, while the feedback control is conducted when the mean value is below the predetermined reference value. Disclosed also is an apparatus suitable for carrying out this method.
摘要翻译： 公开了一种控制供给内燃机的空气燃料混合物的空燃比的方法。 该方法采用反馈控制，其中根据通过检测排气的分量读取的空燃比，进行控制以将空燃比维持在化学计量水平，并且至少在空转 发动机在升温之后，进行控制以使空燃比维持在化学计量水平较稀侧的精馏控制。 当在发动机预热之后的空转期间，在预定时间段内的发动机转速的平均值大于预定的参考值时，允许倾斜控制，而当平均值低于预定参考值时进行反馈控制 。 还公开了适用于实施该方法的装置。
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公开(公告)号：US20170307477A1
公开(公告)日：2017-10-26
申请号：US15513688
申请日：2015-09-18
申请人： DENSO CORPORATION
CPC分类号： G01M15/102 , F01N11/00 , F01N13/008 , F02D41/1454 , F02D41/1486 , F02D41/1495 , F02D41/28 , F02D2041/1432 , F02D2041/281 , F02D2041/286 , F02D2200/101
摘要： A signal processing apparatus for a gas sensor is applied to a gas sensor that is disposed on an exhaust passage of an engine to detect a concentration of a specific component in exhaust gas flowing through the exhaust passage. The signal processing apparatus includes a filtering means that attenuates exhaust pulsation noise included in a detection signal of the gas sensor, and a filter characteristic setting means that variably sets filter characteristics of the filtering means based on engine speed.
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公开(公告)号：US09657672B2
公开(公告)日：2017-05-23
申请号：US14883107
申请日：2015-10-14
CPC分类号： F02D41/1454 , F01N11/007 , F02D41/003 , F02D41/0035 , F02D41/123 , F02D41/1486 , F02D41/1495 , Y02T10/47
摘要： A method of monitoring an exhaust gas sensor coupled in an engine exhaust in an engine is provided. The method includes adjusting engine operation responsive to exhaust gas sensor degradation, the degradation identified during deceleration fuel shut-off (DFSO) and compensated based on whether vapor purge operation is occurring in the engine during DFSO.
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