公开(公告)号：US20130304356A1

公开(公告)日：2013-11-14

申请号：US13886979

申请日：2013-05-03

Applicant: DENSO CORPORATION

Inventor： Yasuhiro KAWAKATSU ,  Noriaki IWASE

IPC: F02D41/14

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相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。

公开(公告)号：US20170234255A1

公开(公告)日：2017-08-17

申请号：US15585227

申请日：2017-05-03

Applicant: DENSO CORPORATION

Inventor： Noriaki IWASE ,  Yasuo MUKAI

IPC: F02D41/14 ,  F02D41/00

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.

公开(公告)号：US20170089277A1

公开(公告)日：2017-03-30

申请号：US15372807

申请日：2016-12-08

Applicant: DENSO CORPORATION

Inventor： Yasuhiro KAWAKATSU ,  Noriaki IWASE

IPC: F02D41/00 ,  F02D41/26 ,  F02D41/14

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.

公开(公告)号：US20160053701A1

公开(公告)日：2016-02-25

申请号：US14825455

申请日：2015-08-13

Applicant: DENSO CORPORATION

Inventor： Noriaki IWASE ,  Yasuo MUKAI

IPC: F02D41/14 ,  F02D41/00

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.

Abstract translation: 针对设置在发动机的废气收集部中的空燃比传感器的感测值和单独的气缸空气燃料，执行估计单个气缸的空燃比的单独的气缸空燃比估计 基于各个气缸的估计空燃比，进行控制各气缸的空燃比的比率控制，使得气缸之间的空燃比的变化变小。 此外，确定是否引起发动机失火，并且当确定引起发动机失火时，单独的气缸空燃比估计和单缸气缸空燃比控制被停止，并且 通过单独的气缸空燃比控制单独的气缸校正值被复位。 以这种方式，可以避免在由于失火的影响而不能正确地控制单缸的空燃比的状态下，像往常一样连续地执行单个缸空燃比控制。

公开(公告)号：US20150075507A1

公开(公告)日：2015-03-19

申请号：US14463188

申请日：2014-08-19

Applicant: DENSO CORPORATION

Inventor： Noriaki IWASE ,  Yasuo MUKAI

IPC: F02D41/14 ,  F02D41/00

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，以调节空燃比空气比 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。

公开(公告)号：US20150068505A1

公开(公告)日：2015-03-12

申请号：US14463281

申请日：2014-08-19

Applicant: DENSO CORPORATION

Inventor： Noriaki IWASE ,  Yasuo MUKAI

IPC: F02D41/00 ,  F02D41/14

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.

Abstract translation: 基于空燃比传感器的检测值来估计各气缸的空燃比。 执行空燃比检测定时确定，以确定当执行缸缸空燃比控制时，基于估计的空燃比来确定空燃比检测定时的偏差是否存在。 基于空燃比传感器的检测值和估计空燃比计算观测残差。 当观测残差大于或等于规定的阈值时，禁止空燃比检测定时确定。 因此，当在每个气缸的估计空燃比收敛之前观测残余量仍然较大时，或者当由于估计空燃比的估计精度的时间劣化而观察残留仍然较大时，空气 - 燃料比检测定时确定可以被禁止。