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公开(公告)号：US09845719B2
公开(公告)日：2017-12-19
申请号：US14910781
申请日：2014-07-31
Applicant: DENSO CORPORATION
Inventor： Mikiyasu Matsuoka , Yasuo Mukai , Shingo Nakata , Yuji Yamada
IPC: F01N11/00 , G01N27/406 , F01N13/00 , G01M15/10 , G01N33/00 , G01N27/409 , G01N27/26
CPC classification number: F01N11/007 , F01N11/002 , F01N13/008 , F01N2550/02 , G01M15/102 , G01N27/26 , G01N27/4065 , G01N27/409 , G01N33/007
Abstract: An O2 sensor has a sensor element, which includes a solid electrolyte layer and a pair of electrodes, while the solid electrolyte layer is interposed between the electrodes. The O2 sensor outputs an electromotive force signal in response to an air-to-fuel ratio of exhaust gas of an engine, which serves as a sensing subject. A constant current circuit, which induces a flow of a predetermined constant electric current between the pair of electrodes of a sensor element, and a current sensing arrangement, which senses a current value of an actual electric current that is conducted through the sensor element, are provided. A microcomputer determines whether an abnormality of the constant current circuit is present based on the current value of the electric current, which is sensed with the current sensing arrangement, in a case where the constant current is induced by the constant current circuit.
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Patent Agency Ranking
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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3.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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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：US10234418B2
公开(公告)日：2019-03-19
申请号：US15023435
申请日：2014-09-25
Applicant: DENSO CORPORATION
Inventor： Shingo Nakata , Mikiyasu Matsuoka , Yasuo Mukai
IPC: G01N27/417 , G01N27/416 , G01N27/407 , G01N33/00 , G01N27/406 , G01N27/409 , F02D41/12 , F02D41/14
Abstract: An O2 sensor includes a sensor element using a solid electrolyte layer and a pair of electrodes placed at a position to interpose the solid electrolyte layer, detects an exhaust gas from an internal combustion engine as an object of a detection, and outputs an electromotive force signal depending on an air-fuel ratio of the exhaust gas. The sensor element is connected with a constant current circuit supplying a constant current that is prescribed. A microcomputer conducts an abnormality diagnosis of an output response of the sensor element on the basis of a state of variation in an electromotive force output. Further, when the microcomputer conducts the abnormality diagnosis, the microcomputer restricts a supply of the constant current by the constant current circuit before conducting the abnormality diagnosis.
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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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