公开(公告)号：US06453724B1

公开(公告)日：2002-09-24

申请号：US09399949

申请日：1999-09-20

申请人： Tomoo Kawase ,  Eiichi Kurokawa ,  Satoshi Hada ,  Toshiyuki Suzuki

发明人： Tomoo Kawase ,  Eiichi Kurokawa ,  Satoshi Hada ,  Toshiyuki Suzuki

IPC分类号： G01N700

CPC分类号： G01N27/4067 ,  G01N33/0037 ,  Y02A50/245

摘要： A gas concentration sensor comprises a pump cell for detecting an oxygen concentration in an exhaust gas and a sensor cell for detecting a NOx concentration in the exhaust gas. A porous diffusive layer is interposed between these cells. Furthermore, the sensor comprises a heater for heating these cells. A control circuit produces a sensor cell voltage having an A.C. component to detect the impedance of sensor cell. The electric power supplied to the heater is controlled based on a detected impedance value of the sensor cell.

摘要翻译： 气体浓度传感器包括用于检测排气中的氧浓度的泵室和用于检测废气中的NOx浓度的传感器单元。 这些细胞之间插入多孔扩散层。 此外，传感器包括用于加热这些电池的加热器。 控制电路产生具有交流分量的传感器电池电压，以检测传感器单元的阻抗。 基于检测到的传感器单元的阻抗值来控制提供给加热器的电力。

公开(公告)号：US06442998B1

公开(公告)日：2002-09-03

申请号：US09899845

申请日：2001-07-09

申请人： Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada ,  Toshiyuki Suzuki ,  Satoshi Nakamura

发明人： Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada ,  Toshiyuki Suzuki ,  Satoshi Nakamura

IPC分类号： G01N27416

摘要： A gas concentration measuring apparatus is provided which measures the concentration of two kinds of gas components such as O2 and NOx contained in exhaust gasses of an internal combustion engine of automotive vehicles. The apparatus has a gas sensor which includes a first cell responsive to application of a voltage to discharge O2 in the exhaust gasses to the outside and produce an electric current as a function of concentration of the discharged O2 and a second cell responsive to application of a voltage to produce an electric current as a function of concentration of NOx in the exhaust gasses from which the O2 is discharged by the first cell. The apparatus offsets an error component of the electric current produced by the second cell which depends upon O2 contained in the exhaust gasses.

公开(公告)号：US06478940B1

公开(公告)日：2002-11-12

申请号：US09383383

申请日：1999-08-26

申请人： Toshiyuki Suzuki ,  Eiichi Kurokawa ,  Satoshi Hada ,  Tomoo Kawase

发明人： Toshiyuki Suzuki ,  Eiichi Kurokawa ,  Satoshi Hada ,  Tomoo Kawase

IPC分类号： G01N2741

CPC分类号： G01N27/4065

摘要： A limit-current type A/F sensor produces element current responsive to oxygen concentration in the exhaust gas when a voltage is applied to its sensor element portion. An application voltage control circuit comprises an operational amplifier and resistors. An output of the control circuit is applied to one terminal of the A/F sensor via a driver circuit. The other terminal of the A/F sensor is connected to an output terminal of an operational amplifier via a current-detecting resistor. The element current value, detected by the current-detecting resistor, is returned to the application voltage control circuit via a buffer. In the application voltage control circuit, adjustment of the gain is performed in such a manner that the inclination of the application voltage line on the V-I coordinate becomes larger than the inclination equivalent to the A.C. impedance of the sensor element in the sensor activated condition.

摘要翻译： 当电压施加到其传感器元件部分时，极限电流型A / F传感器产生响应于排气中的氧浓度的元件电流。 施加电压控制电路包括运算放大器和电阻器。 控制电路的输出通过驱动电路施加到A / F传感器的一个端子。 A / F传感器的另一个端子通过电流检测电阻连接到运算放大器的输出端。 由电流检测电阻检测的元件电流值通过缓冲器返回到施加电压控制电路。 在施加电压控制电路中，以使得V-I坐标上的施加电压线的倾斜度大于传感器激活状态下传感器元件的交流阻抗等于倾斜度的方式进行增益调整。

公开(公告)号：US06383354B1

公开(公告)日：2002-05-07

申请号：US09394030

申请日：1999-09-13

申请人： Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada ,  Toshiyuki Suzuki

发明人： Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada ,  Toshiyuki Suzuki

IPC分类号： G01N27407

CPC分类号： G01N27/4074

摘要： A gas concentration sensing apparatus includes a gas introducing portion for introducing a measurement gas. A first cell opposed to the gas introduction portion operates for pumping oxygen from the measurement gas in the gas introducing portion. A second cell opposed to the gas introducing portion operates for sensing a concentration in a specific component of the measurement gas from which oxygen has been pumped by the first cell. There is a reference gas chamber to which at least one of the first cell and the second cell is exposed. The one of the first cell and the second cell which is exposed to the reference gas chamber includes an electrode facing the gas introducing portion. A current flowing through the first cell is sensed. A voltage is applied to the first cell in response to the sensed current through the first cell. A current flowing through the second cell is sensed. A voltage is applied to the second cell in response to the sensed current through the second cell. A voltage at the electrode is floated from a voltage of 0 V.

摘要翻译： 气体浓度检测装置包括用于导入测量气体的气体导入部。 与气体引入部相对的第一电池用于从气体导入部中的测量气体中泵送氧气。 与气体导入部相对的第二电池用于感测由第一电池泵送氧气的测定气体的特定成分中的浓度。 存在第一电池和第二电池中的至少一个被暴露的参考气室。 暴露于参考气室的第一电池和第二电池中的一个包括面对气体导入部分的电极。 感测流过第一单元的电流。 响应于通过第一单元的感测电流，向第一单元施加电压。 感测流经第二单元的电流。 响应于通过第二单元的感测电流，向第二单元施加电压。 电极上的电压从0V的电压浮起。

公开(公告)号：US06656337B2

公开(公告)日：2003-12-02

申请号：US09984663

申请日：2001-10-30

申请人： Eiichi Kurokawa ,  Satoshi Hada ,  Toshiyuki Suzuki ,  Mitsunobu Niwa

发明人： Eiichi Kurokawa ,  Satoshi Hada ,  Toshiyuki Suzuki ,  Mitsunobu Niwa

IPC分类号： G01N27407

CPC分类号： G01N27/4175 ,  G01N27/419

摘要： A gas concentration measuring apparatus is provided which includes a gas concentration sensor consisting of a pump cell, a sensor cell, and a monitor cell. The pump cell works to determine the concentration of O2. The sensor cell works to decompose an oxygen containing gas such as NOx and provide an output indicative of the concentration of NOx. The apparatus also includes an applying voltage determining circuit which looks up a predetermined voltage-to-current relation to determine a target voltage to be applied to the pump cell as a function of the current produced by the pump cell so as to preclude the pump cell from decomposing the oxygen containing gas component, thereby minimizing an error in determining the concentration of oxygen containing gas as a function of the output of the sensor cell.

公开(公告)号：US06336354B1

公开(公告)日：2002-01-08

申请号：US09497179

申请日：2000-02-03

申请人： Toshiyuki Suzuki ,  Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada

发明人： Toshiyuki Suzuki ,  Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada

IPC分类号： G01N2712

CPC分类号： G01N27/4067

摘要： A gas concentration measuring apparatus is provided which measures the concentration of a given gas using a gas sensor. The gas sensor includes a sensor element producing a gas concentration signal indicative of the concentration of the gas, a heater heating the sensor element, and an insulator disposed between the sensor element and the heater. The apparatus includes a heater control circuit which may provisionally supply electrical power to the heater by applying a Pulse-Width-Modulated signal. The heater control circuit performs a switching operation to supply power to the heater cyclically. The apparatus corrects an error contained in the gas concentration signal arising from a leakage current flowing into the sensor element through the insulator during the switching operation of the heater control circuit.

摘要翻译： 提供一种气体浓度测量装置，其使用气体传感器测量给定气体的浓度。 气体传感器包括产生指示气体浓度的气体浓度信号的传感器元件，加热传感器元件的加热器和设置在传感器元件和加热器之间的绝缘体。 该装置包括加热器控制电路，该加热器控制电路可通过施加脉冲宽度调制信号临时向加热器供电。 加热器控制电路执行切换操作以循环地向加热器供电。 该装置在加热器控制电路的切换操作期间，通过绝缘体校正由流入传感器元件的漏电流引起的气体浓度信号中包含的误差。

公开(公告)号：US20070284248A1

公开(公告)日：2007-12-13

申请号：US11797961

申请日：2007-05-09

申请人： Tomoo Kawase ,  Eiichi Kurokawa ,  Satoshi Hada ,  Toshiyuki Suzuki ,  Katsuhide Akimoto

发明人： Tomoo Kawase ,  Eiichi Kurokawa ,  Satoshi Hada ,  Toshiyuki Suzuki ,  Katsuhide Akimoto

IPC分类号： G01N27/26

CPC分类号： G01N27/419 ,  F02D41/1454 ,  F02D41/28 ,  G01R1/203 ,  G01R15/08 ,  G01R19/0092

摘要： A gas concentration measuring apparatus for use in air-fuel ratio control of automotive engines is designed to determine the concentration of oxygen within a wide and a narrow range using a sensor current flowing through a sensor element. The apparatus includes an amplifier circuit equipped with an operational amplifier and a plurality of amplifying resistors and a switch. The switch is responsive to a request signal to switch a relation in electrical connection between an operational amplifier and the amplifying resistors to distribute the amplifying resistors into an input resistor and a feedback resistor for the operational amplifier to change an amplification factor of the amplifier circuit. This results in a change in resolution of measurement of the concentration of oxygen, thereby ensuring enhanced accuracy in determining the concentration of oxygen in a selected one of the narrow and wide ranges.

摘要翻译： 用于汽车发动机的空燃比控制的气体浓度测量装置设计成使用流过传感器元件的传感器电流来确定宽范围和窄范围内的氧浓度。 该装置包括配备有运算放大器和多个放大电阻器和开关的放大器电路。 开关响应于请求信号以在运算放大器和放大电阻之间的电气连接中切换关系，以将放大电阻器分配到输入电阻器和用于运算放大器的反馈电阻器以改变放大器电路的放大系数。 这导致测量氧浓度的分辨率的变化，从而确保在选定的窄范围和宽范围内确定氧气浓度的提高的准确性。

公开(公告)号：US06651639B2

公开(公告)日：2003-11-25

申请号：US10026801

申请日：2001-12-27

申请人： Satoshi Hada ,  Eiichi Kurokawa ,  Toshiyuki Suzuki

发明人： Satoshi Hada ,  Eiichi Kurokawa ,  Toshiyuki Suzuki

IPC分类号： F02D4100

CPC分类号： F02D41/1494

摘要： An air-fuel ratio sensor is equipped with a sensing element including a solid electrolytic substrate. When the sending element is warmed up and activated by a heater, a microcomputer controls electric power supplied to the heater based on a control base value being set according to a duty ratio=100%. A power profile P1 is determined beforehand to set a target heater power. Through the warm-up heater power control, an actual heater power supplied to the heater is equalized to the target heater power determined according to the power profile P1.

公开(公告)号：US06446488B1

公开(公告)日：2002-09-10

申请号：US09321873

申请日：1999-05-28

申请人： Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada ,  Toshiyuki Suzuki

发明人： Eiichi Kurokawa ,  Tomoo Kawase ,  Satoshi Hada ,  Toshiyuki Suzuki

IPC分类号： G01N700

CPC分类号： G01N27/4065 ,  F02D41/1455 ,  F02D41/1456

摘要： A gas concentration measuring apparatus is provided which may be employed in measuring an air-fuel ratio of mixture sucked into automotive engines. The apparatus includes a gas concentration sensor exposed to a gas and a voltage applying circuit. The gas concentration sensor is responsive to application of voltage to produce a current signal indicative of concentration of the gas. The voltage applying circuit includes an operational amplifier which operates on a source voltage and which outputs the voltage for developing the voltage applied to the gas concentration sensor which has a level changing as a function of voltage inputted to the operational amplifier. The operational amplifier is designed to have an amplitude of each of the voltages inputted to and outputted from the operational amplifier which falls within a given input/output voltage range defined between an upper limit and a lower limit of a source voltage range and near at least one of the upper and lower limits of the source voltage range, thereby allowing the air-fuel ratio to be measured with higher accuracy over a wide range.

摘要翻译： 提供一种气体浓度测量装置，其可用于测量吸入汽车发动机的混合物的空燃比。 该装置包括暴露于气体的气体浓度传感器和电压施加电路。 气体浓度传感器响应于施加电压以产生指示气体浓度的电流信号。 电压施加电路包括运算放大器，该运算放大器基于源电压运行，并且输出用于显现施加到气体浓度传感器的电压的电压，其具有作为输入到运算放大器的电压的函数的电平变化。 运算放大器被设计成具有输入到运算放大器的输出和输出的每个电压的幅度，其落在在源极电压范围的上限和下限之间限定的给定输入/输出电压范围内，并且至少接近 源极电压范围的上限和下限之一，从而允许在较宽范围内以更高精度测量空燃比。

公开(公告)号：US08257565B2

公开(公告)日：2012-09-04

申请号：US12035206

申请日：2008-02-21

申请人： Tomoo Kawase ,  Eiichi Kurokawa ,  Toshiyuki Suzuki ,  Yohei Kawaki

发明人： Tomoo Kawase ,  Eiichi Kurokawa ,  Toshiyuki Suzuki ,  Yohei Kawaki

IPC分类号： G01N27/26 ,  G01N7/00

CPC分类号： G01N27/4065

摘要： A sensor control apparatus includes an applied voltage control circuit connected to the positive terminal of a sensor element. The applied voltage control circuit includes a reference power supply and a noninverting amplifier circuit connected to the reference power supply. An AC power supply circuit, a buffer and a current measurement resistance are connected in series to the negative terminal of the sensor element with the current measurement resistance disposed between the AC power supply circuit and the sensor element. One terminal of the current measurement resistance, which is on the side opposite to the sensor element, is held at a reference voltage (center voltage of an AC voltage generated from the AC power supply circuit). Voltage at an intermediate point between the current measurement resistance and the sensor element is inputted via a low-pass filter to the noninverting amplifier circuit of the applied voltage control circuit.

摘要翻译： 传感器控制装置包括连接到传感器元件的正极端子的施加的电压控制电路。 所施加的电压控制电路包括参考电源和连接到参考电源的同相放大器电路。 交流电源电路，缓冲器和电流测量电阻与传感器元件的负极端子串联连接，电流测量电阻设置在交流电源电路和传感器元件之间。 在与传感器元件相反的一侧的电流测量电阻的一个端子被保持在参考电压（由AC电源电路产生的AC电压的中心电压）。 通过低通滤波器将电流测量电阻与传感器元件之间的中间点处的电压输入到所施加的电压控制电路的同相放大器电路。