公开(公告)号：US5993641A

公开(公告)日：1999-11-30

申请号：US996885

申请日：1997-12-23

申请人： Kazuhiro Okazaki ,  Satoshi Haseda ,  Koji Jono ,  Masayuki Takami ,  Tomomichi Mizoguchi

发明人： Kazuhiro Okazaki ,  Satoshi Haseda ,  Koji Jono ,  Masayuki Takami ,  Tomomichi Mizoguchi

IPC分类号： G01N27/41 ,  F02D41/14 ,  G01N27/26 ,  G01N27/407 ,  G01F1/64 ,  G01N17/00

CPC分类号： G01N27/407 ,  F02D41/1456 ,  F02D41/1476

摘要： An A/F sensor outputs a linear air-fuel ratio detection signal proportional to the oxygen concentration in an exhaust gas from an engine upon application of a voltage. A computer controls the applied-voltage in a stoichiometric control region, a lean burn control region, an atmosphere detection region and a rich control region to have a fixed value such that the change rate of the applied-voltage is reduced to be less than that in other regions. In addition, when changing the voltage applied to the A/F sensor, the computer variably sets the voltage change speed sequentially. Thus, the influence of the capacitive characteristic of the A/F sensor is eliminated.

摘要翻译： A / F传感器在施加电压时输出与发动机的排气中的氧浓度成比例的线性空燃比检测信号。 计算机控制化学计量控制区域，稀燃控制区域，气氛检测区域和富控制区域中的施加电压，以具有固定值，使得施加电压的变化率减小到小于 在其他地区。 此外，当改变施加到A / F传感器的电压时，计算机可变地依次设定电压变化速度。 因此，消除了A / F传感器的电容特性的影响。

公开(公告)号：US5935400A

公开(公告)日：1999-08-10

申请号：US947398

申请日：1997-10-08

申请人： Masayuki Takami ,  Tomomichi Mizoguchi ,  Satoshi Haseda ,  Kazuhiro Okazaki

发明人： Masayuki Takami ,  Tomomichi Mizoguchi ,  Satoshi Haseda ,  Kazuhiro Okazaki

IPC分类号： G01N27/41 ,  G01N27/406 ,  G01N27/416 ,  G01N27/26

CPC分类号： G01N27/4067

摘要： An A/F sensor is driven by a voltage applied thereto at a command issued by a microprocessor, outputting an A/F detection signal which is linearly proportional to the concentration of oxygen. The microprocessor controls the voltage applied to the A/F sensor to bring a current flowing through the A/F sensor to a predetermined value in a zone outside a predetermined air-fuel ratio detection zone. In this outside zone, the applied voltage is controlled in accordance with a characteristic different from a positive characteristic in a normal positive characteristic in a voltage-current relation. That is, in a rich zone outside the air-fuel ratio detection zone, the applied voltage is controlled so as to make the applied voltage approach a maximum value of the electromotive force of the A/F sensor. In a lean zone outside the air-fuel ratio detection zone, on the other hand, the applied voltage is controlled so as to make the applied voltage approach a minimum value of the electromotive force of the A/F sensor.

摘要翻译： A / F传感器由以微处理器发出的命令施加的电压驱动，输出与氧气浓度成线性比例的A / F检测信号。 微处理器控制施加到A / F传感器的电压，使流过A / F传感器的电流在预定空燃比检测区域外的区域中达到预定值。 在该外部区域中，施加的电压根据与电压 - 电流关系中的正常正特性中的正特性不同的特性来控制。 也就是说，在空燃比检测区域外的浓区域中，控制施加电压，使施加电压接近A / F传感器的电动势的最大值。 另一方面，在空燃比检测区域内的贫气区域中，控制施加电压，使施加电压接近A / F传感器的电动势的最小值。

公开(公告)号：US6084418A

公开(公告)日：2000-07-04

申请号：US38005

申请日：1998-03-11

申请人： Masayuki Takami ,  Tomomichi Mizoguchi ,  Satoshi Haseda ,  Kazuhiro Okazaki ,  Koji Jono

发明人： Masayuki Takami ,  Tomomichi Mizoguchi ,  Satoshi Haseda ,  Kazuhiro Okazaki ,  Koji Jono

IPC分类号： F02D41/14 ,  G01N27/406 ,  G01N33/00 ,  G01N27/04 ,  G01N27/419 ,  G01R27/08 ,  G01R27/22

CPC分类号： G01N27/4067 ,  F02D41/1494 ,  F02D41/1496 ,  F02D41/1456

摘要： An air-fuel ratio sensor generates linear air-fuel ratio detection signals proportional to concentration of oxygen in exhaust gas from an engine in response to a command voltage from a microprocessor. A bias command signal generated by the microprocessor is provided to a D/A converter which converts it to an analog signal. Thereafter, the signal is provided to an LPF for removing the high frequency components of the analog signal. Output voltage of the LPF is provided to a bias control circuit. A single AC signal which has a predetermined frequency and which is provided with a predetermined time constant (about 159 .mu.s) by the LPF is applied to the air-fuel ratio sensor. Element resistance of the air-fuel ratio sensor is detected based on the voltage of the AC signal and the change in the current level of the air-fuel ratio sensor caused by the application of the AC signal.

摘要翻译： 空燃比传感器响应于来自微处理器的命令电压产生与来自发动机的废气中的氧浓度成比例的线性空燃比检测信号。 由微处理器产生的偏置指令信号被提供给将其转换为模拟信号的D / A转换器。 此后，将信号提供给LPF，以去除模拟信号的高频分量。 LPF的输出电压被提供给偏置控制电路。 具有预定频率并且由LPF提供预定时间常数（约159μs）的单个AC信号被施加到空燃比传感器。 基于交流信号的电压和由于施加交流信号引起的空燃比传感器的当前电平的变化来检测空燃比传感器的元件电阻。

公开(公告)号：US5833836A

公开(公告)日：1998-11-10

申请号：US764652

申请日：1996-12-11

申请人： Masayuki Takami ,  Satoshi Haseda ,  Tomomichi Mizoguchi

发明人： Masayuki Takami ,  Satoshi Haseda ,  Tomomichi Mizoguchi

IPC分类号： G01N27/41 ,  F02D41/14 ,  G01N27/406 ,  G01N27/419 ,  G01N27/407

CPC分类号： G01N27/4065 ,  F02D41/1496 ,  F02D41/1456

摘要： To achieve change-over from detection of an internal resistance of an oxygen sensor S to detection of a threshold current effectively in a short time, a positive desired voltage for measuring a threshold current is applied to an oxygen sensor S to detect the threshold current and then a negative voltage for measuring a temperature is applied to the oxygen sensor S for a short time to detect an internal resistance of the oxygen sensor. After that, when the voltage applied to the oxygen sensor S is restored to a positive desired voltage for measuring the threshold current, by applying a voltage higher than this positive desired voltage temporarily to the oxygen sensor S, discharge or recharge of electric charges due to electrostatic capacitance components of the oxygen sensor S is completed quickly to reduce the time required for convergence to the threshold current when the voltage is changed. As a result, it is possible to reduce the time during which the threshold current cannot be detected.

摘要翻译： 为了实现从氧传感器S的内部电阻的检测到在短时间内有效检测阈值电流的切换，将用于测量阈值电流的正期望电压施加到氧传感器S以检测阈值电流，并且 然后用于测量温度的负电压短时间施加到氧传感器S以检测氧传感器的内阻。 此后，当向氧传感器S施加的电压恢复到用于测量阈值电流的正期望电压时，通过将高于该正期望电压的电压临时施加到氧传感器S，由于电荷的放电或再充电 氧传感器S的静电电容分量快速完成，以便在电压变化时减少收敛到阈值电流所需的时间。 结果，可以减少不能检测到阈值电流的时间。

公开(公告)号：US6096187A

公开(公告)日：2000-08-01

申请号：US64154

申请日：1998-04-22

申请人： Tomomichi Mizoguchi ,  Masayuki Takami ,  Syuichi Nakano

发明人： Tomomichi Mizoguchi ,  Masayuki Takami ,  Syuichi Nakano

IPC分类号： G01N27/41 ,  G01N27/419

CPC分类号： G01N27/419

摘要： A detecting unit of an oxygen sensor as an A/F sensor has a solid electrolyte layer and a diffusion resistance layer and generates a current value according to the concentration of oxygen in an exhaust gas by applying a voltage across electrodes on an exhaust gas side and an atmosphere side of the solid electrolyte layer. An oxygen supply/exhaust unit has a solid electrolyte layer and a pair of electrodes formed on both faces of the solid electrolyte layer, and supplies oxygen near to the electrode on the atmosphere side of the detecting unit or exhausts oxygen near the electrode. A control unit controls, in response to a limit current value detected by a current detection unit, the amount of supply or exhaust of oxygen of the oxygen supply/exhaust unit on the basis of the detected current value. A control target value of a current flowing in the solid electrolyte layer is variably set so that amount of oxygen moving in the solid electrolyte layers are equal, thereby controlling the amount of supply or exhaust of oxygen of the oxygen supply/exhaust unit.

摘要翻译： 作为A / F传感器的氧传感器的检测单元具有固体电解质层和扩散电阻层，并且通过在排气侧侧的电极施加电压而根据排气中的氧浓度生成电流值， 固体电解质层的气氛侧。 氧气供给/排出单元具有在固体电解质层的两面形成的固体电解质层和一对电极，在检测单元的气氛侧的电极附近供给氧，或排出电极附近的氧。 控制单元根据检测到的电流值，响应于由电流检测单元检测到的极限电流值，控制氧供给/排出单元的供氧量或排气量。 在固体电解质层中流动的电流的控制目标值可变地设定为使得在固体电解质层中移动的氧的量相等，从而控制供氧排气单元的供氧量或排出量。

公开(公告)号：US06397659B1

公开(公告)日：2002-06-04

申请号：US09270754

申请日：1999-03-17

申请人： Tomomichi Mizoguchi ,  Masayuki Takami

发明人： Tomomichi Mizoguchi ,  Masayuki Takami

IPC分类号： G01N33497

CPC分类号： G01N27/407

摘要： A/F ratio sensor includes an element portion using a solid electrolytic layer, and generates a sensor current in proportion to an oxygen concentration in an exhaust gas when a voltage is applied thereto. A bias control circuit switches the voltage applied to the A/F ratio sensor to an element resistance detection voltage during an element resistance detection with a given time constant, and detects the sensor current flowing at that time. A comparing circuit detects an amount of voltage change reaching a given value. A timing decision circuit decides a detection of voltage and current changes during the decision timing of the comparing circuit. A data output circuit measures the current change relative to the voltage change in response to the timing decision of the timing decision circuit. In this apparatus, the voltage change and the current change are detected when the applied voltage, which change with the given time constant, reaches to the given reference voltage Vref. In other words, the amount of the current change &Dgr;I of the sensor current is detected before the voltage, which change with the given time constant, converges to the voltage V0.

摘要翻译： A / F比传感器包括使用固体电解质层的元件部分，并且当施加电压时，产生与排气中的氧浓度成比例的传感器电流。 在给定时间常数的元件电阻检测期间，偏置控制电路将施加到A / F比传感器的电压切换为元件电阻检测电压，并且检测当时流动的传感器电流。 比较电路检测达到给定值的电压变化量。 定时判定电路在比较电路的判定定时期间决定电压和电流变化的检测。 数据输出电路响应于定时决定电路的定时决定来测量相对于电压变化的电流变化。 在该装置中，当以给定时间常数变化的施加电压达到给定参考电压Vref时，检测电压变化和电流变化。 换句话说，在以给定时间常数变化的电压收敛到电压V0之前，检测传感器电流的电流变化量DELTAI。

公开(公告)号：US06258232B1

公开(公告)日：2001-07-10

申请号：US09218083

申请日：1998-12-22

申请人： Jun Hasegawa ,  Yukihiro Yamashita ,  Tomomichi Mizoguchi ,  Masayuki Takami

发明人： Jun Hasegawa ,  Yukihiro Yamashita ,  Tomomichi Mizoguchi ,  Masayuki Takami

IPC分类号： G01N27407

CPC分类号： F02D41/1494 ,  F02D41/1456 ,  G01N27/4067

摘要： A sensor element of an A/F sensor is constructed to laminate and integrate a solid electrolyte and a heater. The A/F sensor outputs a linear A/F detection signal proportional to the oxygen concentration in exhaust gases, when voltage is applied. An ECU controls the heater through heater control circuit to keep the sensor element at a predetermined activation temperature. The ECU detects an element resistance on the basis of the voltage applied to the sensor element and sensor current caused by the applied voltage, and converts the element resistance to an element temperature. During the temperature increasing of the A/F sensor, the current supply to the heater is duty-controlled according to the element temperature changing rate (the temperature increasing rate of the sensor element). Accordingly, the temperature increasing characteristics of the sensor is satisfactorily maintained, and disadvantages such as an element cracking are prevented.

摘要翻译： A / F传感器的传感器元件被构造成层压和集成固体电解质和加热器。 当施加电压时，A / F传感器输出与排气中的氧浓度成比例的线性A / F检测信号。 ECU通过加热器控制电路控制加热器，以将传感器元件保持在预定的活化温度。 ECU根据施加到传感器元件的电压和由施加电压引起的传感器电流检测元件电阻，并将元件电阻转换为元件温度。 在A / F传感器的温度升高期间，根据元件温度变化率（传感器元件的升温速率）对加热器的电流进行占空比控制。 因此，能够令人满意地保持传感器的升温特性，防止元件破裂等缺点。

公开(公告)号：US5781878A

公开(公告)日：1998-07-14

申请号：US655097

申请日：1996-06-04

申请人： Tomomichi Mizoguchi ,  Masayuki Takami ,  Kazuhiro Okazaki

发明人： Tomomichi Mizoguchi ,  Masayuki Takami ,  Kazuhiro Okazaki

IPC分类号： F02D41/14 ,  G01N27/417 ,  G01N33/00 ,  G01M15/00

CPC分类号： F02D41/1495 ,  G01N27/4175

摘要： An oxygen sensor has a detecting device unit for outputting a sensor current such as a limiting current of which a value is constant even though a sensing voltage applied to the oxygen sensor changes in a limiting current generating region and corresponds to an air-fuel ratio of a combustion gas and a heater for heating the detecting device unit to keep a resistance of the detecting device unit even though the oxygen sensor is degraded. When the sensing voltage is changed to a second sensing voltage of a resistance governing region, a current peak occurs in the sensor current, and a peak current value is detected. Because the peak current value decreases as the oxygen sensor is gradually degraded, when the peak current value is lower than a degradation judging value, it is judged that the oxygen sensor is degraded. Therefore, the diagnosis of the degradation of the oxygen sensor can be performed with a high accuracy.

摘要翻译： 氧传感器具有检测装置单元，用于输出传感器电流，例如其值恒定的限制电流，即使施加到氧传感器的感测电压在极限电流产生区域中变化，并且对应于空燃比 用于加热检测装置单元以保持检测装置单元的电阻的燃烧气体和加热器，即使氧传感器劣化。 当感测电压变为电阻控制区域的第二感测电压时，传感器电流发生电流峰值，并检测峰值电流值。 由于峰值电流值随氧传感器逐渐劣化而降低，所以当峰值电流值低于劣化判定值时，判断为氧传感器劣化。 因此，能够高精度地进行氧传感器的劣化的诊断。

公开(公告)号：US20120187908A1

公开(公告)日：2012-07-26

申请号：US13499084

申请日：2010-09-28

申请人： Keisuke Tanigawa ,  Takumi Shimizu ,  Tomomichi Mizoguchi ,  Manabu Sasaki ,  Yoshiaki Kikuchi ,  Ryo Mano ,  Jyunta Izumi ,  Teruo Ishishita

发明人： Keisuke Tanigawa ,  Takumi Shimizu ,  Tomomichi Mizoguchi ,  Manabu Sasaki ,  Yoshiaki Kikuchi ,  Ryo Mano ,  Jyunta Izumi ,  Teruo Ishishita

IPC分类号： H02J7/00

CPC分类号： B60L11/1851 ,  B60L11/1861 ,  G01R19/16542 ,  G01R31/362 ,  G01R31/3658 ,  H01M10/482 ,  H02J7/0013 ,  H02J7/0021 ,  H02J7/0026 ,  Y02T10/7005 ,  Y02T10/7011 ,  Y02T10/7044 ,  Y02T10/705 ,  Y02T10/7055

摘要： A plurality of voltage switching circuits 41 are provided in a switching unit 40 to relatively change a reference voltage to plural levels, thus detecting a spontaneous change of the reference voltage. A range of relative change in the reference voltage by the plurality of voltage switching circuits 41 is set to a usage voltage range 81 or 82 as a part of a total voltage range 80 of each of cells 1a to 1d. This eliminates the need to provide voltage switching circuits 41 required to relatively change the reference voltage over the total voltage range of each of the cells 1a to 1d, making it possible to minimize the number of the voltage switching circuits 41 for each of the cells 1a to 1d. Thus, it is possible to prevent the size of a battery pack control apparatus 2 from increasing.

摘要翻译： 多个电压切换电路41设置在开关单元40中，以将参考电压相对地改变为多个电平，从而检测参考电压的自发变化。 多个电压开关电路41的参考电压的相对变化范围被设定为使用电压范围81或82作为每个单元1a至1d的总电压范围80的一部分。 这样就不需要提供在每个单电池1a至1d的总电压范围内相对地改变参考电压所需的电压开关电路41，使得可以使每个电池1a的电压切换电路41的数量最小化 至1d。 因此，可以防止电池组控制装置2的尺寸增大。

公开(公告)号：US20120001639A1

公开(公告)日：2012-01-05

申请号：US13206841

申请日：2011-08-10

申请人： Tomomichi Mizoguchi ,  Takumi Shimizu ,  Keisuke Tanigawa ,  Manabu Sasaki ,  Yoshiaki Kikuchi ,  Ryo Mano ,  Jyunta Izumi ,  Teruo Ishishita

发明人： Tomomichi Mizoguchi ,  Takumi Shimizu ,  Keisuke Tanigawa ,  Manabu Sasaki ,  Yoshiaki Kikuchi ,  Ryo Mano ,  Jyunta Izumi ,  Teruo Ishishita

IPC分类号： G01N27/416

CPC分类号： G01R19/16542 ,  G01R35/00

摘要： A first monitor circuit 50 and a second monitor circuit 60 each having an identical configuration are provided in a voltage monitor. A threshold switching section 41 switches a threshold of each of switching units 51 and 61 provided in the respective monitor circuits 50 and 60 to a same value. Each of comparators 53 and 63 compares the threshold with a reference voltage to output a result of the comparison. A fault detecting section 42 compares the respective outputs from the comparators 53 and 63 with each other to detect a characteristic shift of the threshold of each of the monitor circuits 50 and 60.

摘要翻译： 在电压监视器中设置具有相同结构的第一监视电路50和第二监视电路60。 阈值切换部分41将设置在各个监视电路50和60中的每个开关单元51和61的阈值切换到相同的值。 比较器53和63中的每一个将阈值与参考电压进行比较，以输出比较结果。 故障检测部分42将比较器53和63的各个输出彼此进行比较，以检测每个监视器电路50和60的阈值的特性偏移。