公开(公告)号：US09890725B2

公开(公告)日：2018-02-13

申请号：US14896110

申请日：2014-05-16

申请人： DENSO CORPORATION

发明人： Mikiyasu Matsuoka ,  Shingo Nakata

IPC分类号： G01N37/00 ,  F02D41/12 ,  F02D41/14 ,  F02D41/22 ,  G01N27/406 ,  G01M15/10 ,  G01N33/00

CPC分类号： F02D41/123 ,  F02D41/1456 ,  F02D41/1495 ,  F02D41/1496 ,  F02D41/222 ,  G01M15/104 ,  G01N27/4065 ,  G01N33/007

摘要： A constant current circuit is controlled to stop a constant current Ics (Ics=0) flowing between sensor electrodes of an oxygen sensor, in a period before the oxygen sensor becomes active, during a fuel cut of an engine, and after the engine stops. When an abnormality (for example, a failure) occurs in the constant current circuit, a sensor output equivalent to an output of the oxygen sensor of when the constant current circuit is controlled to stop the constant current Ics is different from a normal sensor output. An abnormality diagnosis is executed to determine a presence or absence of the abnormality in the constant current circuit depending on whether the output of the oxygen sensor is out of a predetermined normal range, in a period before the oxygen sensor becomes active, during a fuel cut of an engine, and after the engine stops (when the constant current circuit is controlled to stop the constant current Ics).

公开(公告)号：US09702836B2

公开(公告)日：2017-07-11

申请号：US13818227

申请日：2010-09-08

申请人： Hiroki Nishijima

发明人： Hiroki Nishijima

IPC分类号： G01N25/00 ,  F02D41/14 ,  F02D41/22 ,  G01N15/06 ,  G01N27/04

CPC分类号： G01N25/00 ,  F01N2560/05 ,  F02D41/1446 ,  F02D41/1466 ,  F02D41/1494 ,  F02D41/1495 ,  F02D41/1496 ,  F02D41/222 ,  G01N15/0656 ,  G01N27/04 ,  Y02T10/40

摘要： An object of the present invention is to reliably detect clogging in a cover even during a period corresponding to a dead zone of a detection apparatus. A PM sensor includes an element section, an element temperature detection section, a heater, and an element cover. An ECU detects clogging in the element cover based on a difference between an element temperature and an exhaust temperature when the exhaust temperature rises. Furthermore, the ECU detects clogging in the element cover based on temperature rising characteristics of the element section observed when the element section is heated by the heater. Thus, even during the period corresponding to the dead zone of the PM sensor, clogging in the element cover can be reliably detected, thus improving the reliability of the sensor.

公开(公告)号：US20150362456A1

公开(公告)日：2015-12-17

申请号：US14681159

申请日：2015-04-08

申请人： DENSO CORPORATION

发明人： Masafumi UMENO

IPC分类号： G01N27/406 ,  F02D41/14 ,  F02D41/30

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

摘要： A control circuit includes a sweep circuit for supplying a sweep current to a gas concentration sensor, a current detection resistor for detecting a sensor current flowing in the gas concentration sensor, a calculation circuit for calculating an impedance of the gas concentration sensor based on the sensor current and an inter-terminal voltage of the gas concentration sensor, and a protective element for suppressing external noise from being applied to the sweep circuit and the calculation circuit. The sweep current is divided to flow in a first protective element and the gas concentration sensor. The sensor current is divided to flow in a second protective element and the current detection resistor. The calculation circuit calculates a loss current flowing to the first protective element or a second loss current flowing to the second protective element and calculates the sensor current based on the calculated current.

摘要翻译： 控制电路包括用于向气体浓度传感器提供扫频电流的扫描电路，用于检测在气体浓度传感器中流动的传感器电流的电流检测电阻器，用于基于传感器计算气体浓度传感器的阻抗的计算电路 电流和气体浓度传感器的端子间电压，以及用于抑制外部噪声施加到扫描电路和计算电路的保护元件。 扫描电流被分为在第一保护元件和气体浓度传感器中流动。 传感器电流被分成在第二保护元件和电流检测电阻器中流动。 计算电路计算流向第一保护元件的损耗电流或流过第二保护元件的第二损耗电流，并基于计算出的电流来计算传感器电流。

公开(公告)号：US20100206280A1

公开(公告)日：2010-08-19

申请号：US12555499

申请日：2009-09-08

申请人： Masahiko Nomura ,  Koji Hashimoto

发明人： Masahiko Nomura ,  Koji Hashimoto

IPC分类号： F02D41/00 ,  F02M51/00 ,  F02D41/30

CPC分类号： F02D41/146 ,  F02D41/1455 ,  F02D41/1494 ,  F02D41/1496 ,  F02D41/2435 ,  F02D41/2454 ,  F02D41/2474 ,  F02D41/3005

摘要： A vehicle-mounted engine control apparatus can accurately measure the resistance value of a label resistor arranged in an exhaust gas sensor for correcting characteristic variation thereof by using a reduced number of wires. An electric heater of the exhaust gas sensor, which is powered from a second power supply wire, as well as the label resistor and air fuel ratio measurement elements are connected to the apparatus which is powered from an on-vehicle battery through a first power supply wire. A power feed voltage of the apparatus is input to a multichannel AD converter through voltage dividing resistors, so that a positive end potential of the label resistor is measured alternatively. A negative end potential of the label resistor is input to the converter as a divided voltage thereof with a fixed resistor. The label resistance value is calculated from a fixed resistor current and a label resistor voltage.

摘要翻译： 车载发动机控制装置可以精确地测量布置在废气传感器中的标签电阻器的电阻值，以通过使用减少数量的电线来校正其特性变化。 由第二电源线供电的排气传感器的电加热器以及标签电阻器和空燃比测量元件连接到由车载电池通过第一电源供电的设备 线。 该装置的馈电电压通过分压电阻器输入到多通道AD转换器，从而交替地测量标签电阻器的正端电位。 标签电阻器的负端电位以固定电阻器的分压输入到转换器。 标签电阻值由固定电阻电流和标签电阻电压计算。

公开(公告)号：US06769417B1

公开(公告)日：2004-08-03

申请号：US10633570

申请日：2003-08-05

申请人： Masaki Ueno ,  Hideharu Yamazaki ,  Tetsuo Endo

发明人： Masaki Ueno ,  Hideharu Yamazaki ,  Tetsuo Endo

IPC分类号： F02M3302

CPC分类号： F01N13/009 ,  F01N3/0814 ,  F01N3/0835 ,  F01N3/0878 ,  F01N11/00 ,  F01N2560/028 ,  F02D41/0235 ,  F02D41/1441 ,  F02D41/1459 ,  F02D41/1495 ,  F02D41/1496 ,  F02D2041/1472 ,  F02D2041/228 ,  F02M26/15 ,  Y02T10/20 ,  Y02T10/47

摘要： After an internal combustion engine 1 has started to operate, a changing timing is detected at which a humidity represented by the output signal of a humidity sensor 23 disposed downstream of a hydrocarbon adsorbent 12 changes to a tendency to monotonously increase from a low humidity to a high humidity. Data representing a total amount of moisture carried by an exhaust gas emitted by the internal combustion engine 1 to the hydrocarbon adsorbent 12 up to the changing timing is acquired as a deterioration evaluating parameter. The deteriorated state of the hydrocarbon adsorbent is evaluated based on the deterioration evaluating parameter. The changing timing is detected as a timing at which the relative humidity represented by the output signal of the humidity sensor 23 has changed from a low humidity to a high humidity by a preset value. The preset value is variably set in order to compensate for characteristic changes of the humidity sensor 23 and variations of individual humidity sensors. The deteriorated state of the hydrocarbon adsorbent can thus adequately be monitored while compensating for the characteristic changes of the humidity sensor and the variations of individual humidity sensors.

摘要翻译： 在内燃机1开始运行之后，检测出由位于碳氢化合物吸附剂12的下游侧的湿度传感器23的输出信号所表示的湿度变化为从低湿度向单调增加的趋势的变更时刻 高湿度 获取表示由内燃机1向碳氢化合物吸附剂12排出的废气在变更时刻所携带的水分总量的数据作为劣化评价参数。 基于劣化评价参数来评价烃吸附剂的劣化状态。 作为将由湿度传感器23的输出信号表示的相对湿度从低湿度变为高湿度的预定值的时刻，检测出变更时刻。 为了补偿湿度传感器23的特性变化和各个湿度传感器的变化，可以设定预设值。 因此可以充分监测烃吸附剂的劣化状态，同时补偿湿度传感器的特性变化和各个湿度传感器的变化。

公开(公告)号：US06679238B2

公开(公告)日：2004-01-20

申请号：US10101988

申请日：2002-03-19

申请人： Yonas Nebiyeloul-Kifle ,  Kenneth C. Swartz ,  Eric H. Gassenfeit

发明人： Yonas Nebiyeloul-Kifle ,  Kenneth C. Swartz ,  Eric H. Gassenfeit

IPC分类号： F02D4100

CPC分类号： G01M15/104 ,  F02D41/1456 ,  F02D41/1494 ,  F02D41/1495 ,  F02D41/1496 ,  F02D2041/1417

摘要： A method and apparatus determine exhaust gas temperature and control the heater of a heated exhaust gas oxygen sensor. Heater failures are diagnosed based on the level of current flowing through the heater. Exhaust gas temperature is determined by using a Kalman filter. The exhaust gas temperature sensor is eliminated while maintaining a high degree of accuracy. Current flowing through the heater is used to calculate the temperature of the heater. The temperature of the heater is compared to a desired temperature range and the current to the heater is adjusted to maintain the desired temperature range.

摘要翻译： 一种方法和装置确定废气温度并控制加热的排气氧传感器的加热器。 加热器故障根据流经加热器的电流水平进行诊断。 废气温度通过使用卡尔曼滤波器来确定。 废气温度传感器被消除，同时保持高精度。 使用流过加热器的电流来计算加热器的温度。 将加热器的温度与期望的温度范围进行比较，并且调节到加热器的电流以保持期望的温度范围。

公开(公告)号：US20030196428A1

公开(公告)日：2003-10-23

申请号：US10408121

申请日：2003-04-08

发明人： Hisashi Iida ,  Mitsuo Hara ,  Hideki Suzuki ,  Yoshiyuki Okamoto

IPC分类号： F01N003/00 ,  F01N003/02 ,  F01N003/10

CPC分类号： F02D41/1441 ,  F01N3/10 ,  F01N13/009 ,  F01N13/0093 ,  F01N2570/00 ,  F01N2570/12 ,  F01N2570/14 ,  F02D41/1456 ,  F02D41/1494 ,  F02D41/1496

摘要： A first oxygen sensor is mounted on an exhaust pipe. An ECU determines an electric power to be fed to a sensor heater, by a heater control quantity calculating block, in accordance with a difference between an actual impedance and a target impedance calculated by a running condition determining block and a specific gas sensitivity priority determining block. As a result, the detection sensitivity of the oxygen sensor to a rich component or a lean component is improved according to the running condition. This improved output is detected by an output detecting block and reflected on the air/fuel ratio control so that an air/fuel ratio is controlled thereby.

摘要翻译： 第一氧传感器安装在排气管上。 ECU根据由运行条件判定块计算出的实际阻抗与目标阻抗之间的差异以及特定气体灵敏度优先级确定块，根据加热器控制量计算块，确定要传送到传感器加热器的电力 。 结果，根据运行条件，氧传感器对浓组分或稀组分的检测灵敏度得到改善。 该改善的输出由输出检测块检测并反映在空/燃比控制上，从而控制空燃比。

公开(公告)号：US06294075B1

公开(公告)日：2001-09-25

申请号：US09499430

申请日：2000-02-07

申请人： Luca Poggio ,  Marco Secco ,  Daniele Ceccarini

发明人： Luca Poggio ,  Marco Secco ,  Daniele Ceccarini

IPC分类号： G01N27407

CPC分类号： F02D41/1495 ,  F02D41/1456 ,  F02D41/1494 ,  F02D41/1496

摘要： A method of controlling and diagnosing the heater of a sensor sensitive to the composition of the exhaust gas of an engine; the sensor having at least an electrolytic cell sensitive to oxygen ions, and supplying information relative to the ratio of the mixture supplied to the engine; the method including the steps of: calculating an internal resistance value of the cell on the basis of detected values of the voltage at the terminals of the cell before and after supplying a reference current to the cell; correcting the calculated internal resistance value as a function of the detected ratio of the mixture supplied to the engine; converting the corrected internal resistance value into a current temperature value of the sensor; feedback controlling the temperature of the sensor by regulating the current supplied to the heater by processing the deviation between the current temperature value and an objective temperature; and diagnosing the efficiency of the heater as of the corrected internal resistance value of the cell.

摘要翻译： 一种控制和诊断对发动机废气的组成敏感的传感器的加热器的方法; 所述传感器至少具有对氧离子敏感的电解池，并且提供与提供给发动机的混合物的比率的信息; 该方法包括以下步骤：基于在向单元提供参考电流之前和之后的单元的端子处的电压的检测值来计算单元的内部电阻值; 根据检测到的供给发动机的混合物的比例来校正所计算的内部电阻值; 将校正的内部电阻值转换为传感器的当前温度值; 通过处理当前温度值和目标温度之间的偏差来调节供给加热器的电流来控制传感器的温度; 并且根据电池的校正的内部电阻值来诊断加热器的效率。

公开(公告)号：US5675069A

公开(公告)日：1997-10-07

申请号：US613088

申请日：1996-03-08

申请人： Richard Schleupen ,  Hans-Dieter Schray ,  Bernd Tepass ,  Walter Grote

发明人： Richard Schleupen ,  Hans-Dieter Schray ,  Bernd Tepass ,  Walter Grote

IPC分类号： G01N27/409 ,  F02D41/14 ,  F02D45/00 ,  G01N27/406 ,  G01N7/00

CPC分类号： F02D41/1495 ,  F02D41/1493 ,  F02D41/1496 ,  G01N27/4065

摘要： The invention is directed to a circuit for processing a signal (UL) of a lambda probe having a probe signal terminal on which the signal (UL) is outputted and a probe ground terminal. The circuit includes a voltage source having a plus pole and having a minus pole connected to the probe ground terminal. A first network of passive components is connected between the plus pole and the probe signal terminal for dividing the voltage between the plus pole and the probe signal terminal in a pregiven ratio thereby providing a divided potential as a first analog signal. An analog-to-digital converter has an input and is connected to a chassis ground at a ground potential different than the ground potential at the probe ground terminal. A second network of passive components is connected to the plus pole for supplying a potential proportional to the potential on the plus pole as a second analog signal. The input of the converter is directly connected to the first network to receive the first analog signal and to the second network to receive the second analog signal thereby facilitating digital processing of the first and second analog signals in the converter.

摘要翻译： 本发明涉及一种用于处理具有在其上输出信号（UL）的探针信号端子的探针的信号（UL）的电路和探针接地端子。 电路包括具有正极的电压源，并具有连接到探针接地端子的负极。 无源部件的第一网络连接在正极和探针信号端子之间，用于以预定比率分压正极与探针信号端子之间的电压，从而提供分压电位作为第一模拟信号。 模拟 - 数字转换器具有输入，并且以与探头接地端子处的接地电位不同的接地电位连接到机箱接地。 无源部件的第二网络连接到正极，用于提供与正极上的电位成比例的电位作为第二模拟信号。 转换器的输入直接连接到第一网络以接收第一模拟信号和第二网络以接收第二模拟信号，从而便于转换器中的第一和第二模拟信号的数字处理。

公开(公告)号：US5461902A

公开(公告)日：1995-10-31

申请号：US318103

申请日：1994-10-05

申请人： Yoichi Iwata

发明人： Yoichi Iwata

IPC分类号： G01N27/41 ,  F02B1/04 ,  F02D41/14 ,  G01N27/406 ,  G01N27/16 ,  G01N27/407

CPC分类号： F02D41/1494 ,  F02D41/1496 ,  G01N27/4065 ,  G01N27/4067 ,  F02B1/04

摘要： An oxygen sensor heat controlling apparatus includes: a current-limiting type oxygen sensor whose electrical characteristic varies with a change in an oxygen concentration of exhaust gases from an internal combustion engine, and whose alternating current resistance varies with a change in an operating temperature of the sensor; a voltage source connected with the sensor through a resistor to supply a given voltage to the sensor; a differential amplifier having a first input connected with the sensor and a second input connected with the voltage source through the resistor, the amplifier producing at its output an output signal derived from the difference between the given voltage and an output voltage from the sensor, the output signal being representative of the oxygen concentration of the exhaust gases; a first closed loop circuit which connects the output of the amplifier with the first input of the amplifier via a first feedback resistor so as to control a current flow through the sensor; a second closed loop circuit which connects the output of the amplifier with the second input thereof via a second feedback resistor; a heater for heating the sensor; an oscillation detecting circuit for detecting occurrence of an oscillation at the output of the amplifier and for outputting a pulse when the occurrence of the oscillation is detected; and a current control circuit for applying current to the heater when the oscillation has not occurred, and for stopping the application of current to the heater in response to the pulse.

摘要翻译： 氧传感器热控装置包括：限流型氧传感器，其电特性随着来自内燃机的废气的氧浓度的变化而变化，并且其交流电阻随着工作温度的变化而变化 传感器; 电压源通过电阻器与传感器连接，以向传感器提供给定的电压; 差分放大器，其具有与传感器连接的第一输入端和通过电阻器与电压源连接的第二输入端，该放大器在其输出端产生从该传感器的给定电压和输出电压之间的差导出的输出信号， 输出信号代表废气的氧气浓度; 第一闭环电路，其通过第一反馈电阻器将放大器的输出与放大器的第一输入端连接，以便控制通过传感器的电流; 第二闭环电路，其经由第二反馈电阻器将放大器的输出与其第二输入连接; 用于加热传感器的加热器; 振荡检测电路，用于检测放大器的输出端的振荡的发生，并且在检测到发生振荡时输出脉冲; 以及电流控制电路，用于当没有发生振荡时向加热器施加电流，并且用于响应于脉冲停止向加热器施加电流。