公开(公告)号：US20160201540A1

公开(公告)日：2016-07-14

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 ,  F01N13/00 ,  G01M15/10

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.

Abstract translation: O2传感器具有传感器元件，其包括固体电解质层和一对电极，而固体电解质层介于电极之间。 O2传感器响应作为感测对象的发动机的排气的空燃比而输出电动势信号。 在传感器元件的一对电极之间引起预定恒定电流流动的恒流电路和感测通过传感器元件传导的实际电流的电流值的电流检测装置是 提供。 在由恒流电路引起的恒定电流的情况下，微型计算机基于在电流检测装置感测到的电流的当前值来判定是否存在恒流电路的异常。

公开(公告)号：US20160202210A1

公开(公告)日：2016-07-14

申请号：US15023435

申请日：2014-09-25

Applicant: DENSO CORPORATION

Inventor： Shingo NAKATA ,  Mikiyasu MATSUOKA ,  Yasuo MUKAI

IPC: G01N27/416 ,  G01N27/407 ,  G01N33/00

CPC classification number: G01N27/4163 ,  F02D41/123 ,  F02D41/1454 ,  F02D41/1495 ,  G01N27/4065 ,  G01N27/4071 ,  G01N27/409 ,  G01N33/007 ,  G01N33/0073

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.

Abstract translation: O2传感器包括使用固体电解质层的传感器元件和置于固体电解质层的位置的一对电极，检测作为检测对象的来自内燃机的废气，并输出电动势信号 取决于废气的空燃比。 传感器元件与提供规定的恒定电流的恒流电路连接。 微型计算机基于电动势输出的变化状态对传感器元件的输出响应进行异常诊断。 此外，当微计算机执行异常诊断时，微机在进行异常诊断之前，通过恒流电路限制恒定电流的供给。

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：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。