公开(公告)号：US20200088673A1

公开(公告)日：2020-03-19

申请号：US16692339

申请日：2019-11-22

Applicant: DENSO CORPORATION

Inventor： Tadakatsu KOYABU ,  Yuki MURAYAMA ,  Ryozo KAYAMA ,  Akari HASEGAWA ,  Yusuke KAWAMOTO

IPC: G01N27/416 ,  G01N27/407

Abstract: Each of SCUs to includes: a voltage switching unit that performs a first voltage switching to increase an oxygen concentration in a gas chamber and a second voltage switching to decrease the oxygen concentration in the gas chamber after the execution of the first voltage switching; an output change calculation unit that calculates an output change parameter indicating a change in output of the sensor cell according to the voltage switching; a concentration difference calculation unit that calculates a concentration difference parameter indicating a concentration difference in the oxygen concentration or in the concentration of the specific gas in the detection target gas between before the first voltage switching and after the second voltage switching; and a deterioration determination unit that determines a deterioration state of the sensor cell based on the output change parameter and the concentration difference parameter.

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.

公开(公告)号：US20200224575A1

公开(公告)日：2020-07-16

申请号：US16832433

申请日：2020-03-27

Applicant: DENSO CORPORATION

Inventor： Yuki MURAYAMA ,  Ryozo KAYAMA ,  Yusuke TODO ,  Manabu YOSHIDOME

IPC: F01N11/00 ,  G01N27/41 ,  C25B1/04

Abstract: A microcomputer includes a voltage application unit that selectively applies a normal voltage and a removal voltage higher than the normal voltage to a first cell of the exhaust gas sensor. The first cell is configured to remove, based on the removal voltage, oxygen in an exhaust gas from an internal combustion engine. The microcomputer includes an element temperature measurement unit that measures an element temperature parameter indicative of a temperature of the first cell. The microcomputer includes a termination determination unit that determines, based on the element temperature parameter, a termination time of terminating the application of the removal voltage to the first cell by the voltage application unit.

公开(公告)号：US20190219537A1

公开(公告)日：2019-07-18

申请号：US16250151

申请日：2019-01-17

Applicant: DENSO CORPORATION

Inventor： Shoki SHIMIZU ,  Ryozo KAYAMA ,  Tadakatsu KOYABU ,  Yuki MURAYAMA

IPC: G01N27/416 ,  F02D41/22 ,  F02D41/14 ,  G01M15/10 ,  G01N27/41 ,  G05B19/042

CPC classification number: G01N27/4163 ,  F02D41/146 ,  F02D41/1488 ,  F02D41/222 ,  G01M15/102 ,  G01N27/41 ,  G05B19/042

Abstract: In a control device for an exhaust gas sensor, a deterioration determination section determines whether the magnitude of a signal outputted from a second cell has exceeded a threshold to thereby determine whether a first cell has deteriorated. A threshold setting section variably sets the threshold depending on a concentration of the oxygen in the exhaust gas.

公开(公告)号：US20170184536A1

公开(公告)日：2017-06-29

申请号：US15388181

申请日：2016-12-22

Applicant: DENSO CORPORATION

Inventor： Yusuke KAWAMOTO ,  Toru KATAFUCHI ,  Takehito KIMATA ,  Ryozo KAYAMA

IPC: G01N27/406 ,  G01N27/407

CPC classification number: G01N27/4065 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/4163

Abstract: An SCU as a control device for the gas sensor (first and second NOx sensors) includes an applied voltage switching unit for switching an applied voltage of a pump cell when a deterioration detecting function is performed, and a deterioration rate calculation unit for calculating a deterioration rate of a sensor cell based on a slope during a transient change in an output of the sensor cell according to a switching of the applied voltage by the applied voltage switching unit.

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：US20200264127A1

公开(公告)日：2020-08-20

申请号：US16782404

申请日：2020-02-05

Applicant: DENSO CORPORATION

Inventor： Shoki SHIMIZU ,  Ryozo KAYAMA ,  Yuki MURAYAMA

IPC: G01N27/419 ,  G01N27/41 ,  G01N27/406 ,  G01N27/407 ,  G01N33/00

Abstract: A first cell includes a first electrode in a measurement gas chamber and a second electrode in a reference gas chamber. A second cell includes a third electrode in the measurement gas chamber and a fourth electrode in the reference gas chamber to cause a current therebetween that corresponds to a concentration of a specific gas component in detected gas in the measurement chamber. A controller selectively implements a normal control and a reduction control. The normal control is to apply a lower voltage to the first electrode and the second electrode to remove oxygen from the detected gas. The reduction control is to apply a higher voltage to the first electrode and the second electrode to reduce the third electrode that is oxidized. The controller prohibits implementation of the reduction control on determination that implementation of the reduction control.

公开(公告)号：US20180340909A1

公开(公告)日：2018-11-29

申请号：US15988329

申请日：2018-05-24

Applicant: DENSO CORPORATION

Inventor： Tadakatsu KOYABU ,  Tomoo KAWASE ,  Yuki MURAYAMA ,  Ryozo KAYAMA ,  Akari HASEGAWA ,  Shoki SHIMIZU

IPC: G01N27/416 ,  G01M15/10 ,  F01N11/00 ,  G01N27/406 ,  G01N27/407 ,  G01N27/41 ,  G01N27/419 ,  G01N27/409 ,  G01N27/417

Abstract: In a gas sensor, a pump cell adjusts a concentration of oxygen in a gas chamber based of a pump cell supply voltage. A sensor cell detects a concentration of a specific gas in a detection target gas after the pump cell has adjusted the concentration of oxygen. In a sensor control unit, a voltage switching part adjusts the pump cell supply voltage to be supplied to the pump cell. A pump cell output control part adjusts a variation range of a pump cell output current of the pump cell before and after a voltage switching process of the pump cell supply voltage to be within a predetermined variation range. A deteriorated state detection part detects a deteriorated state ratio of the sensor cell based on variation of an output current of the sensor cell due to the voltage switching process performed by the voltage switching part.

公开(公告)号：US20180306074A1

公开(公告)日：2018-10-25

申请号：US15765785

申请日：2016-09-26

Applicant: DENSO CORPORATION

Inventor： Ryozo KAYAMA ,  Masanori KUROSAWA

IPC: F01M13/04 ,  F02D35/00 ,  F02M25/08

CPC classification number: F01M13/04 ,  F01M13/00 ,  F01M2013/027 ,  F02D35/00 ,  F02D41/0032 ,  F02D41/22 ,  F02D2200/0414 ,  F02D2250/08 ,  F02M25/0827 ,  F02M25/0836 ,  F02M25/0854 ,  F02M25/0872

Abstract: An abnormality detection device for an engine system detects an abnormality in a fuel vapor pipe connected to an intake pipe of an engine at a portion upstream of a supercharger in a flow direction of intake air. The abnormality detection device includes an intake air temperature sensor and an abnormality detection portion. The intake air temperature sensor is fitted to the intake pipe on an upstream side of the supercharger in the flow direction of intake air and detects a temperature of intake air mixed with fuel vapor introduced into the intake pipe from the fuel vapor pipe. The abnormality detection portion detects an abnormality in the fuel vapor pipe according to a detection value of intake air detected by the intake air temperature sensor.

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。