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1.发明授权Gas concentration measuring apparatus designed to minimize error component contained in output 失效气体浓度测量装置设计用于最小化输出中包含的误差分量公开(公告)号：US06849174B2
公开(公告)日：2005-02-01
申请号：US10373289
申请日：2003-02-26
IPC分类号： G01N27/41 , G01N27/00 , G01N27/26 , G01N27/407 , G01N27/416 , G01N27/417 , G01N27/419
CPC分类号： G01N27/4067
摘要： A gas concentration measuring apparatus which has a gas sensor designed to measure, for example, the concentrations of O2 and HOx contained in exhaust emissions of an automotive engine is provided. The apparatus includes a signal processing circuit which converts a current signal outputted from the gas sensor as a function of the concentration of either of O2 and NOx into a voltage signal. The gas sensor and the signal processing circuit are connected electrically through a conductor. The conductor has a length which is determined as a function of a level of the current signal outputted from the gas sensor. The weaker the level of the current signal is, the shorter the length of the conductor. This minimizes addition of electrical noises to the current signal outputted from the gas sensor.
摘要翻译： 提供了一种气体浓度测量装置，其具有设计用于测量例如汽车发动机的废气排放中所含的O 2和HO x的浓度的气体传感器。 该装置包括信号处理电路，其将从气体传感器输出的电流信号作为O2和NOx中的任一个的浓度变换为电压信号。 气体传感器和信号处理电路通过导体电连接。 导体具有根据从气体传感器输出的电流信号的电平确定的长度。 电流信号的电平越弱，导体长度越短。 这最小化了从气体传感器输出的电流信号中增加电噪声。
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2.发明授权公开(公告)号：US06547955B1
公开(公告)日：2003-04-15
申请号：US09453518
申请日：1999-12-03
IPC分类号： G01N27407
CPC分类号： G01N27/4067
摘要： A gas concentration measuring apparatus which has a gas sensor designed to measure, for example, the concentrations of O2 and HOx contained in exhaust emissions of an automotive engine is provided. The apparatus includes a signal processing circuit which converts a current signal outputted from the gas sensor as a function of the concentration of either of O2 and HOx into a voltage signal. The gas sensor and the signal processing circuit are connected electrically through a conductor. The conductor has a length which is determined as a function of a level of the current signal outputted from the gas sensor. The weaker the level of the current signal is, the shorter the length of the conductor. This minimizes addition of electrical noises to the current signal outputted from the gas sensor.
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3.发明授权
公开(公告)号：US5980710A
公开(公告)日：1999-11-09
申请号：US64155
申请日：1998-04-22
IPC分类号： G01N27/41 , G01N27/26 , G01N27/406
CPC分类号： G01N27/4065 , Y10T29/49004 , Y10T29/49083 , Y10T29/49101
摘要： An A/F sensor generates a current signal corresponding to an air-fuel ratio in response to a voltage applied by a bias control circuit. After a sensor current is received as a voltage signal via a voltage follower, it is outputted to an A/D converter having a predetermined input voltage range, 0 to 5V. A sensor current detection circuit has a plurality of current detection resistors. In order to variably set the resistance value by the sensor current detection circuit, a switch circuit is switched in accordance with the sensor current depending on whether the A/F value to be detected is in the zone near the stoichiometric ratio or in other air-fuel ratio zones.
摘要翻译： 响应于由偏置控制电路施加的电压，A / F传感器产生对应于空燃比的电流信号。 在通过电压跟随器接收到作为电压信号的传感器电流之后，将其输出到具有0至5V的预定输入电压范围的A / D转换器。 传感器电流检测电路具有多个电流检测电阻。 为了通过传感器电流检测电路可变地设置电阻值，根据检测的A / F值是否处于接近化学计量比的区域或其他空气 - 电流检测电路中，根据传感器电流切换开关电路， 燃料比区。
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公开(公告)号：US06868712B2
公开(公告)日：2005-03-22
申请号：US10032582
申请日：2002-01-02
CPC分类号： F02D41/1495 , F02D41/1456 , Y10T436/218
摘要： An A/F signal proportional to an oxygen concentration in the exhaust gas from an internal combustion engine is output upon application of a voltage based on an instruction from a microcomputer. At the time an element resistance is detected, a bias instruction signal Vr from the microcomputer is converted by a D/A converter 21 to an analog signal Vb. An output voltage Vc obtained by removing high frequency components from the analog signal Vb through an LPF 22 is input to a bias control circuit 40. During this time period in which the element resistance is detected, an accurate A/F signal is not output. Therefore, the A/F signal that has theretofore prevailed is held by a Sample/Hold circuit 70 to thereby prevent the use of an erroneous A/F signal. Namely, at the time of detecting the element resistance, the detected value of the oxygen concentration is prevented from becoming abnormal. As a result, an accurate A/F control can be executed using the detected element resistance.
摘要翻译： 与来自内燃机的废气中的氧气浓度成比例的A / F信号是在基于微型计算机的指令施加电压时输出的。 在检测到元件电阻时，来自微型计算机的偏置指令信号Vr由D / A转换器21转换成模拟信号Vb。 将通过LPF22从模拟信号Vb除去高频分量而获得的输出电压Vc输入到偏置控制电路40.在检测到元件电阻的该时间段期间，不输出精确的A / F信号。 因此，由采样/保持电路70保持已经存在的A / F信号，从而防止使用错误的A / F信号。 也就是说，在检测元件电阻时，防止氧浓度的检测值变得异常。 结果，可以使用检测到的元件电阻来执行精确的A / F控制。
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公开(公告)号：US06347544B1
公开(公告)日：2002-02-19
申请号：US09064163
申请日：1998-04-22
IPC分类号： G01N2700
CPC分类号： F02D41/1495 , F02D41/1456 , Y10T436/218
摘要： An A/F signal proportional to an oxygen concentration in the exhaust gas from an internal combustion engine is output upon application of a voltage based on an instruction from a microcomputer. At the time an element resistance is detected, a bias instruction signal Vr from the microcomputer is converted by a D/A converter 21 to an analog signal Vb. An output voltage Vc obtained by removing high frequency components from the analog signal Vb through an LPF 22 is input to a bias control circuit 40. During this time period in which the element resistance is detected, an accurate A/F signal is not output. Therefore, the A/F signal that has theretofore prevailed is held by a Sample/Hold circuit 70 to thereby prevent the use of an erroneous A/F signal. Namely, at the time of detecting the element resistance, the detected value of the oxygen concentration is prevented from becoming abnormal. As a result, an accurate A/F control can be executed using the detected element resistance.
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6.发明授权公开(公告)号：US06226861B1
公开(公告)日：2001-05-08
申请号：US09370896
申请日：1999-08-10
IPC分类号： H05B300
CPC分类号： G01N27/4065 , Y10T29/49004 , Y10T29/49083 , Y10T29/49101
摘要： An A/F sensor generates a current signal corresponding to an air-fuel ratio in response to a voltage applied by a bias control circuit. After a sensor current is received as a voltage signal via a voltage follower, it is outputted to an A/D converter having a predetermined input voltage range, 0 to 5V. A sensor current detection circuit has a plurality of current detection resistors. In order to variably set the resistance value by the sensor current detection circuit, a switch circuit is switched in accordance with the sensor current depending on whether the A/F value to be detected is in the zone near the stoichiometric ratio or in other air-fuel ratio zones.
摘要翻译： 响应于由偏置控制电路施加的电压，A / F传感器产生对应于空燃比的电流信号。 在通过电压跟随器接收到作为电压信号的传感器电流之后，将其输出到具有0至5V的预定输入电压范围的A / D转换器。 传感器电流检测电路具有多个电流检测电阻。 为了通过传感器电流检测电路可变地设置电阻值，根据检测的A / F值是否处于接近化学计量比的区域或其他空气 - 电流检测电路中，根据传感器电流切换开关电路， 燃料比区。
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公开(公告)号：US6164125A
公开(公告)日：2000-12-26
申请号：US55784
申请日：1998-04-07
IPC分类号： F02D41/14 , G01N27/417 , G01N33/00 , G01M19/00
CPC分类号： G01N27/4175 , F02D41/1456 , F02D41/1494 , F02D41/1495
摘要： A gas concentration sensor voltage and current (in both heater on and heater off states) are detected and compared with predetermined thresholds, respectively, by a microcomputer. Based on a combination of the comparison results, the presence or absence of trouble in the system is detected and trouble location in the system is specified. In addition or alternatively, the sensor voltage is compared with thresholds to determine whether it is outside of a normal zone. The voltage may be actually detected or calculated. If the voltage is outside the normal zone, sensor voltage is reduced to zero or restricted to a predetermined limit.
摘要翻译： 通过微型计算机分别检测气体浓度传感器电压和电流（两者在加热器开启和加热器关闭状态）并与预定阈值进行比较。 基于比较结果的组合，检测系统中存在或不存在故障，并指定系统中的故障定位。 另外或替代地，将传感器电压与阈值进行比较以确定其是否在正常区域之外。 可以实际检测或计算电压。 如果电压在正常区域之外，则传感器电压降低到零或限制在预定的极限。
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公开(公告)号：US6067841A
公开(公告)日：2000-05-30
申请号：US64784
申请日：1998-04-23
IPC分类号： G01N27/41 , F02D41/00 , F02D41/06 , F02D41/14 , F02D41/34 , G01N27/12 , G01N27/406 , G01N27/416 , G01N27/419 , G01N33/00 , G01N7/00 , G01L3/26 , G01N27/26
CPC分类号： G01N27/4067 , F02D41/068 , F02D41/1455 , F02D41/1456 , F02D41/1496 , F02D41/008
摘要： A method that detects an air-fuel ratio in each cylinder of an internal combustion engine by properly setting a cycle of detecting an element resistance of an A/F oxygen concentration sensor. Although an actual A/F signal is at the stoichiometric ratio in each cylinder at exhaust timing cycle in a practical engine rotational speed range, the ratio is largely deviated to the rich side in the #1 cylinder. The first element resistance detection timing cycle coincides with generation timing of the actual A/F signal, so that the A/F signal cannot be detected. When the element resistance detection timing cycle is preset so as to be longer than the exhaust timing cycle, the second actual A/F signal detection timing for the #1 cylinder does not coincide with the element resistance detection timing. Consequently, the actual A/F signal of the #1 cylinder can be detected as an A/F signal by the A/F sensor.
摘要翻译： 通过适当地设定检测A / F氧浓度传感器的元件电阻的周期来检测内燃机的各气缸的空燃比的方法。 虽然实际的A / F信号在实际的发动机转速范围内在排气定时周期处于每个气缸中的化学计量比，但该比率在很大程度上偏离＃1气缸中的浓侧。 第一元件电阻检测定时周期与实际A / F信号的产生定时一致，从而不能检测到A / F信号。 当元件电阻检测定时周期被预设为比排气定时周期长时，＃1气缸的第二实际A / F信号检测定时与元件电阻检测定时不一致。 因此，可以通过A / F传感器将＃1气缸的实际A / F信号检测为A / F信号。
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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。
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公开(公告)号：US06442998B1
公开(公告)日：2002-09-03
申请号：US09899845
申请日：2001-07-09
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.
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