公开(公告)号：US11346298B2

公开(公告)日：2022-05-31

申请号：US16299308

申请日：2019-03-12

申请人： DENSO CORPORATION

发明人： Hiroshi Suzuki ,  Yasuhiro Kawakatsu

IPC分类号： F02D41/24 ,  F02D41/14

摘要： In a control device for an internal combustion engine, a learning map includes at least one partitioned operating region. The at least one partitioned operating region corresponds to at least one of operating conditions of the internal combustion engine. The learning map includes a value of at least one control parameter stored in the at least one partitioned operating region. A control unit controls the internal combustion engine in accordance with the at least one control parameter. An updating unit learns a value of the at least one control parameter for the at least one of the operating conditions, thus performing an updating of the value of the at least one control parameter stored in the at least one partitioned operating region to the learned value. A partition changing unit changes a partition pattern of the learning map.

公开(公告)号：US20170067386A1

公开(公告)日：2017-03-09

申请号：US15308972

申请日：2015-04-17

申请人： DENSO CORPORATION

发明人： Yasuhiro Kawakatsu

IPC分类号： F01N11/00 ,  F02D41/14 ,  F02D41/30 ,  F01N3/20

CPC分类号： F01N11/007 ,  F01N3/10 ,  F01N3/20 ,  F01N11/00 ,  F01N2550/02 ,  F01N2550/03 ,  F01N2560/025 ,  F01N2900/1402 ,  F01N2900/1624 ,  F02D41/0295 ,  F02D41/1441 ,  F02D41/1458 ,  F02D41/3005 ,  F02D2200/0814 ,  Y02T10/47

摘要： An oxygen storage state of a catalyst is estimated based on an output of an air-fuel ratio sensor, and the oxygen storage state of the catalyst is controlled, such that the oxygen storage state of the catalyst reaches a neutral state, based on an estimation value of the oxygen storage state. In addition, the estimation value of the oxygen storage state is corrected based on the estimation value of the oxygen storage state and an output of an oxygen sensor such that deterioration of accuracy of the oxygen storage state estimation is restricted. Furthermore, a constant current is caused to flow in a direction in which rich detection by the oxygen sensor is expedited in a case of transition of the output of the oxygen sensor to a lean side. The constant current is caused to flow in a direction in which lean detection by the oxygen sensor is expedited in a case of transition of the output of the oxygen sensor to a rich side. Accordingly, an air-fuel ratio change in the catalyst and a change in actual oxygen storage state of the catalyst can be detected early based on the output of the oxygen sensor, and the deterioration of the accuracy of the oxygen storage state estimation can be detected early.

摘要翻译： 基于空燃比传感器的输出来估计催化剂的氧气储存状态，并且基于估计来控制催化剂的氧气储存状态，使得催化剂的氧气储存状态达到中性状态 氧气储存状态的值。 此外，基于氧气储存状态的估计值和氧气传感器的输出校正氧储存状态的估计值，从而限制了氧气储存状态估计的精度的劣化。 此外，在氧传感器的输出向倾斜侧的过渡的情况下，使恒定电流在加热氧传感器的富检测的方向上流动。 在氧传感器的输出向富侧的过渡的情况下，使恒定电流在加热氧传感器的稀薄检测的方向上流动。 因此，可以根据氧传感器的输出来早期检测催化剂的空燃比变化和催化剂的实际储氧状态的变化，并且可以检测氧储存状态估计的精度的劣化 早。

公开(公告)号：US11384677B2

公开(公告)日：2022-07-12

申请号：US17345170

申请日：2021-06-11

申请人： DENSO CORPORATION

发明人： Hiroshi Suzuki ,  Yasuhiro Kawakatsu

IPC分类号： F01N11/00 ,  F01N3/10

摘要： A state estimation apparatus includes: a rate calculating configured to calculate, based on both a flow rate and an air-fuel ratio of exhaust gas flowing into an oxygen storage catalyst, a rate of change in an oxygen storage amount in the oxygen storage catalyst; a limit calculating unit configured to calculate a limit rate which is a limit value for the rate of change; and a storage-amount updating unit configured to update, based on the rate of change and the limit rate, an estimated value of the oxygen storage amount. Moreover, the storage-amount updating unit is further configured to: update, when the rate of change does not exceed the limit rate, the estimated value based on the rate of change; and update, when the rate of change exceeds the limit rate, the estimated value based on the limit rate.

公开(公告)号：US10247120B2

公开(公告)日：2019-04-02

申请号：US15372807

申请日：2016-12-08

申请人： DENSO CORPORATION

发明人： Yasuhiro Kawakatsu ,  Noriaki Iwase

IPC分类号： F02D41/00 ,  F02D41/14 ,  F02D41/24 ,  F02D41/26

摘要： 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：US09567931B2

公开(公告)日：2017-02-14

申请号：US13886979

申请日：2013-05-03

申请人： DENSO CORPORATION

发明人： Yasuhiro Kawakatsu ,  Noriaki Iwase

IPC分类号： G06F7/00 ,  F02D41/14 ,  F02D41/00 ,  F02D41/24

CPC分类号： F02D41/008 ,  F02D41/1445 ,  F02D41/1456 ,  F02D41/1458 ,  F02D41/1473 ,  F02D41/2451 ,  F02D41/2461 ,  F02D41/248 ,  F02D41/26 ,  F02D2250/14

摘要： 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.

摘要翻译： 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。