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公开(公告)号：US09644554B2
公开(公告)日：2017-05-09
申请号：US14463281
申请日：2014-08-19
Applicant: DENSO CORPORATION
Inventor： Noriaki Iwase , Yasuo Mukai
CPC classification number: F02D41/008 , F02D41/1456 , F02D41/1458 , F02D41/2451 , F02D41/2454 , F02D2250/14
Abstract: An air-fuel-ratio of each cylinder is estimated based on a detection value of an air-fuel-ratio sensor. An air-fuel-ratio detection timing determination is executed to determine whether a deviation in air-fuel-ratio detection timing exists based on the estimated air-fuel-ratio while the cylinder-by-cylinder air-fuel-ratio control is performed. An observation residual is computed based on the detection value of the air-fuel-ratio sensor and the estimated air-fuel-ratio. When the observation residual is greater than or equal to a specified threshold value, the air-fuel-ratio detection timing determination is prohibited. Therefore, when the observation residual is still large before the estimated air-fuel-ratio of each cylinder is converged, or when the observation residual is still large due to a temporal deterioration in estimating accuracy of the estimated air-fuel-ratio, the air-fuel-ratio detection timing determination can be prohibited.
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Patent Agency Ranking
公开(公告)号：US09790882B2
公开(公告)日：2017-10-17
申请号：US15585227
申请日：2017-05-03
Applicant: DENSO CORPORATION
Inventor： Noriaki Iwase , Yasuo Mukai
CPC classification number: F02D41/1454 , F02D41/008 , F02D41/0085 , F02D41/1439 , F02D41/1445 , F02D41/1488 , F02D41/1498 , F02D2200/1015 , G01M15/11
Abstract: An individual cylinder air-fuel ratio estimation of estimating an air-fuel ratio of an individual cylinder is performed on a sensed value of an air-fuel ratio sensor set in an exhaust gas collection part of an engine, and an individual cylinder air-fuel ratio control of controlling the air-fuel ratio of the individual cylinder is performed in such a way that a variation in the air-fuel ratio between the cylinders becomes small on the basis of an estimated air-fuel ratio of the individual cylinder. Further, it is determined whether or not a misfire of the engine is caused and when it is determined that the misfire of the engine is caused, the individual cylinder air-fuel ratio estimation and the individual cylinder air-fuel ratio control are stopped and an individual cylinder correction value by the individual cylinder air-fuel ratio control is reset. In this way, it is possible to avoid the individual cylinder air-fuel ratio control from being performed continuously as usual in a state where the air-fuel ratio of the individual cylinder cannot be controlled correctly due to the effect of the misfire.
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公开(公告)号：US10247120B2
公开(公告)日：2019-04-02
申请号：US15372807
申请日：2016-12-08
Applicant: DENSO CORPORATION
Inventor： Yasuhiro Kawakatsu , Noriaki Iwase
Abstract: When executing a Local-learning, an air-fuel ratio detecting time is corrected so that a dispersion of detection values of an air-fuel ratio sensor becomes a maximum value in one cycle of an engine. While executing a cylinder-by-cylinder air-fuel ratio control, a Global-learning is executed. In the Global-learning, the air-fuel ratio detecting time is corrected based on a relationship between a variation in estimated air fuel ratio of each cylinder and a variation in fuel quantity correction value of each cylinder. In the Global-learning, a computer computes a correlation coefficient between the variation in estimated air-fuel ratio and the variation in fuel quantity correction value of the cylinder for each case where the cylinder assumed to correspond to the estimated air fuel ratio is hypothetically varied in multiple ways. Then, the air-fuel ratio detecting time is corrected so that this correlation coefficient becomes a maximum value.
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公开(公告)号：US09890726B2
公开(公告)日：2018-02-13
申请号：US14825455
申请日：2015-08-13
Applicant: DENSO CORPORATION
Inventor： Noriaki Iwase , Yasuo Mukai
CPC classification number: F02D41/1454 , F02D41/008 , F02D41/0085 , F02D41/1439 , F02D41/1445 , F02D41/1488 , F02D41/1498 , F02D2200/1015 , G01M15/11
Abstract: An individual cylinder air-fuel ratio estimation of estimating an air-fuel ratio of an individual cylinder is performed on a sensed value of an air-fuel ratio sensor set in an exhaust gas collection part of an engine, and an individual cylinder air-fuel ratio control of controlling the air-fuel ratio of the individual cylinder is performed in such a way that a variation in the air-fuel ratio between the cylinders becomes small on the basis of an estimated air-fuel ratio of the individual cylinder. Further, it is determined whether or not a misfire of the engine is caused and when it is determined that the misfire of the engine is caused, the individual cylinder air-fuel ratio estimation and the individual cylinder air-fuel ratio control are stopped and an individual cylinder correction value by the individual cylinder air-fuel ratio control is reset. In this way, it is possible to avoid the individual cylinder air-fuel ratio control from being performed continuously as usual in a state where the air-fuel ratio of the individual cylinder cannot be controlled correctly due to the effect of the misfire.
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5.发明授权公开(公告)号：US09567931B2
公开(公告)日：2017-02-14
申请号：US13886979
申请日：2013-05-03
Applicant: DENSO CORPORATION
Inventor： Yasuhiro Kawakatsu , Noriaki Iwase
CPC classification number: F02D41/008 , F02D41/1445 , F02D41/1456 , F02D41/1458 , F02D41/1473 , F02D41/2451 , F02D41/2461 , F02D41/248 , F02D41/26 , F02D2250/14
Abstract: When executing a Local-learning, an air-fuel ratio detecting time is corrected so that a dispersion of detection values of an air-fuel ratio sensor becomes a maximum value in one cycle of an engine. While executing a cylinder-by-cylinder air-fuel ratio control, a Global-learning is executed. In the Global-learning, the air-fuel ratio detecting time is corrected based on a relationship between a variation in estimated air fuel ratio of each cylinder and a variation in fuel quantity correction value of each cylinder. In the Global-learning, a computer computes a correlation coefficient between the variation in estimated air-fuel ratio and the variation in fuel quantity correction value of the cylinder for each case where the cylinder assumed to correspond to the estimated air fuel ratio is hypothetically varied in multiple ways. Then, the air-fuel ratio detecting time is corrected so that this correlation coefficient becomes a maximum value.
Abstract translation: 当执行本地学习时，校正空燃比检测时间，使得空燃比传感器的检测值的偏差在发动机的一个循环中变为最大值。 在执行逐缸空燃比控制时，执行全局学习。 在全球学习中，基于每个气缸的估计空燃比的变化与每个气缸的燃料量校正值的变化之间的关系来校正空燃比检测时间。 在全球学习中，计算机计算出估计空燃比的变化与气缸的燃料量校正值的变化之间的相关系数，其中气缸假定与估计的空气燃料比对应的每种情况是假设地变化的 在多种方式。 然后，校正空燃比检测时间，使得该相关系数成为最大值。
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6.发明授权公开(公告)号：US09482171B2
公开(公告)日：2016-11-01
申请号：US14463188
申请日：2014-08-19
Applicant: DENSO CORPORATION
Inventor： Noriaki Iwase , Yasuo Mukai
CPC classification number: F02D41/1495 , F02D41/008 , F02D41/0085 , F02D41/1439 , F02D41/1454 , F02D41/222 , F02D2041/1417 , Y02T10/40
Abstract: An ECU executes a cylinder-by-cylinder air-fuel-ratio control in which an air-fuel-ratio of each cylinder is estimated based on a detection value of an air-fuel-ratio sensor to adjust the air-fuel-ratio of each cylinder. Further, the ECU computes a learning value of a correction quantity for each cylinder, which is obtained by executing the cylinder-by-cylinder air-fuel-ratio control. Then, the ECU determines whether the estimated air-fuel-ratio has converged according to whether the estimated air-fuel-ratio of each cylinder has been closer to a target value than a specified value for not less than a specified time period. A computation of the learning value is prohibited until the estimated air-fuel-ratio has converged. Therefore, it can be avoided to compute the learning value based on the fuel correction quantity that is obtained when the estimated air-fuel-ratio has not converged yet.
Abstract translation: ECU执行逐缸空燃比控制，其中基于空燃比传感器的检测值来估计每个气缸的空燃比以调节空燃比空燃比 每个气缸。 此外，ECU计算通过执行逐缸空燃比控制而获得的每个气缸的校正量的学习值。 然后，ECU根据各气缸的估计空燃比是否比指定时间段内的指定值更接近目标值，判定估计空燃比是否收敛。 禁止计算学习值，直到估计的空燃比收敛。 因此，可以避免基于当估计空燃比尚未收敛时获得的燃料校正量来计算学习值。
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