公开(公告)号：US20160223488A1

公开(公告)日：2016-08-04

申请号：US14917326

申请日：2014-09-11

Applicant: DENSO CORPORATION

Inventor： Ryozo KAYAMA ,  Yukihiro YAMASHITA ,  Yoshihiro SAKASHITA

IPC: G01N27/419 ,  G01N27/409 ,  F01N11/00 ,  G01N27/41

CPC classification number: G01N27/419 ,  F01N11/007 ,  G01N27/409 ,  G01N27/41 ,  G01N27/4175 ,  Y02T10/47

Abstract: A NOx sensor includes a pump cell, a monitor cell, and a sensor cell, and the pump cell discharges an oxygen in an exhaust gas introduced into a chamber. The sensor cell outputs a detected signal depending on a concentration of a NOx according to a gas after the oxygen is discharged. A microcomputer of a sensor control circuit temporarily changes an amount of the oxygen discharged by the pump cell, and then calculates output change amounts ΔIp, ΔIs, and ΔIm of the cells. The microcomputer performs a correction of the concentration of the NOx detected by the sensor cell and a deterioration diagnosis of the sensor cell, based on the output change amounts ΔIp, ΔIs, and ΔIm of the cells. When the sensor cell current Is is smaller than the monitor cell current Im, the microcomputer determines that the NOx sensor has an abnormality.

Abstract translation: NOx传感器包括泵电池，监测电池和传感器电池，泵电池对引入室内的废气中的氧气进行放电。 传感器单元根据氧气排出后的气体的NOx浓度输出检测信号。 传感器控制电路的微计算机暂时改变由泵浦单元排出的氧的量，然后计算单元的输出变化量ΔIp，ΔIs和ΔIm。 微型计算机基于单元的输出变化量ΔIp，ΔIs和ΔIm，对传感器单元检测到的NOx的浓度进行校正和传感器单元的劣化诊断。 当传感器单元电流Is小于监视单元电流Im时，微型计算机确定NOx传感器具有异常。

公开(公告)号：US20170010236A1

公开(公告)日：2017-01-12

申请号：US15120629

申请日：2015-04-08

Applicant: DENSO CORPORATION

Inventor： Yoshihiro SAKASHITA ,  Yukihiro YAMASHITA ,  Ryozo KAYAMA

IPC: G01N27/406 ,  F01N11/00 ,  G01N27/409 ,  F01N9/00

CPC classification number: G01N27/4067 ,  F01N9/00 ,  F01N11/002 ,  F01N11/007 ,  F01N2560/025 ,  F01N2560/20 ,  F02D41/1446 ,  F02D41/146 ,  F02D41/1494 ,  G01N27/409

Abstract: An exhaust gas sensor includes a sensor element having a plurality of cells, and a heater heating the sensor element. A heater control device for the exhaust gas sensor includes a heater power control unit that performs an impedance control, in which an energization of the heater is controlled by detecting an impedance of one cell to be measured, of the plurality of cells, such that the impedance of the one cell agrees with a target impedance. The heater power control unit, in the impedance control, estimates a temperature of the other cell other than the one cell based on at least one parameter of an energization condition of the heater and an operating condition of the internal-combustion engine, and corrects the target impedance so that the temperature of the other cell becomes lower than or equal to a permissible upper limit temperature.

Abstract translation: 排气传感器包括具有多个电池的传感器元件和加热该传感器元件的加热器。 一种用于废气传感器的加热器控制装置包括：加热器功率控制单元，其执行阻抗控制，其中通过检测多个单元的一个测量单元的阻抗来控制加热器的通电，使得 一个电池的阻抗与目标阻抗一致。 阻抗控制中的加热器功率控制单元基于加热器的通电条件和内燃机的运行状态的至少一个参数，估计除了一个电池之外的另一个电池的温度，并校正 目标阻抗使得另一个电池的温度变得低于或等于允许的上限温度。

公开(公告)号：US20170219513A1

公开(公告)日：2017-08-03

申请号：US15328732

申请日：2015-07-24

Applicant: DENSO CORPORATION

Inventor： Ryozo KAYAMA ,  Yukihiro YAMASHITA

IPC: G01N27/406 ,  G01N27/407 ,  G01N27/41

Abstract: A gas concentration detection device includes a pump cell, a sensor cell, a monitor cell, a sensor current detection unit detecting a current outputted by the sensor cell, a monitor current detection unit detecting a current outputted by the monitor cell, a voltage adjustment unit adjusting a pump cell voltage applied to the pump cell, and a sensitivity determination unit determining a gas sensitivity of at least one of the sensor cell or the monitor cell. The voltage adjustment unit changes the pump cell voltage from a target voltage into a detection voltage where the concentration of the residual oxygen supplied to the sensor cell and the monitor cell is increased. The sensitivity determination unit determines the gas sensitivity based on a detection current detected by at least one of the sensor current detection unit or the monitor current detection unit in accordance with the concentration of the residual oxygen.

公开(公告)号：US20170009685A1

公开(公告)日：2017-01-12

申请号：US15120615

申请日：2015-04-08

Applicant: DENSO CORPORATION

Inventor： Yoshihiro SAKASHITA ,  Yukihiro YAMASHITA ,  Ryozo KAYAMA

IPC: F02D41/06 ,  F02D41/14 ,  G01N27/417

CPC classification number: F02D41/064 ,  F02D41/146 ,  F02D41/1461 ,  F02D41/1494 ,  G01N27/4067 ,  G01N27/417

Abstract: A heater control device for an exhaust gas sensor disposed in an exhaust gas passage of an internal combustion engine and including a sensor element having a plurality of cells, and a heater heating the sensor element includes: a heater power control unit configured to execute a temp rising control, in which an impedance of one cell to be measured, of the plurality of cells, is detected and a temperature of the sensor element is raised until the impedance of the one cell reaches a target impedance by setting a power control value of the heater as a heating power control value. The heater power control unit continues the temp rising control until an extension period elapses that is needed for the other cell other than the one cell to reach an activation temperature after the impedance of the one cell reaches the target impedance.

Abstract translation: 一种用于排气传感器的加热器控制装置，其设置在内燃机的排气通道中，并且包括具有多个单元的传感器元件，以及加热所述传感器元件的加热器，包括：加热器功率控制单元，被配置为执行温度 检测多个单元中的一个要测量的单元的阻抗的上升控制，并且通过设置一个单元的功率控制值来提高传感器元件的温度，直到一个单元的阻抗达到目标阻抗 加热器作为加热功率控制值。 加热器功率控制单元继续温度升高控制，直到在一个单元的阻抗达到目标阻抗之后，一个单元之外的另一个单元所需的延长时间段达到激活温度。

公开(公告)号：US20180106755A1

公开(公告)日：2018-04-19

申请号：US15837083

申请日：2017-12-11

Applicant: DENSO CORPORATION

Inventor： Ryozo KAYAMA ,  Yukihiro YAMASHITA ,  Yoshihiro SAKASHITA

IPC: G01N27/419 ,  G01N27/417 ,  G01N27/409 ,  F01N11/00 ,  G01N27/41

CPC classification number: G01N27/419 ,  F01N11/007 ,  G01N27/409 ,  G01N27/41 ,  G01N27/4175 ,  Y02T10/47

Abstract: A NOx sensor includes a pump cell, a monitor cell, and a sensor cell, and the pump cell discharges an oxygen in an exhaust gas introduced into a chamber. The sensor cell outputs a detected signal depending on a concentration of a NOx according to a gas after the oxygen is discharged. A microcomputer of a sensor control circuit temporarily changes an amount of the oxygen discharged by the pump cell, and then calculates output change amounts ΔIp, ΔIs, and ΔIm of the cells. The microcomputer performs a correction of the concentration of the NOx detected by the sensor cell and a deterioration diagnosis of the sensor cell, based on the output change amounts ΔIp, ΔIs, and ΔIm of the cells. When the sensor cell current Is is smaller than the monitor cell current Im, the microcomputer determines that the NOx sensor has an abnormality.