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    • 1. 发明申请
    • MISFIRE DETECTION IN AN INTERNAL COMBUSTION ENGINE
    • 内燃机中的MISFIRE检测
    • US20050033501A1
    • 2005-02-10
    • US10637121
    • 2003-08-08
    • Louis LiuRichard GilbertDonald KultgenJeffrey NaberHanlong Yang
    • Louis LiuRichard GilbertDonald KultgenJeffrey NaberHanlong Yang
    • G01M15/11G01M15/00
    • G01M15/11
    • A method and system for a misfire detection acquires (301) a series of acceleration data (302) representative of acceleration behavior of an engine. The data is sampled (304) to obtain acceleration data samples at a rate sufficient to obtain up to fourth-order perturbations of the data. The samples are filtered (322) to provide bandwidth limited samples, which are provided to at least two channels (325, 329). The samples are pattern matched (332) in a first channel to enhance harmonic phenomena and pattern canceled (330) in a second channel to enhance random phenomena. Hard and random misfires are detected (334) dependent on a magnitude of the filtered acceleration data samples. Preferably, a third channel (335) is added to detect multiple misfires.
    • 用于失火检测的方法和系统获取(301)代表发动机的加速行为的一系列加速度数据(302)。 数据被采样(304)以获得加速度数据样本,其速率足以获得数据的高达四阶扰动。 对样本进行滤波(322)以提供带宽限制的样本,其被提供给至少两个信道(325,329)。 样品在第一通道中被模式匹配(332)以增强第二通道中的谐波现象和模式取消(330),以增强随机现象。 检测到硬和随机的失火(334),这取决于经滤波的加速度数据样本的大小。 优选地,添加第三通道(335)以检测多次失火。
    • 2. 发明授权
    • Exhaust gas sensor
    • 废气传感器
    • US06071476A
    • 2000-06-06
    • US970259
    • 1997-11-14
    • Daniel YoungJeffrey NaberNeil AdamsEdward BalkoPatrick BlosserLinda HratkoGerald KoermerJie XueAdam MoyaChowdary Koripella
    • Daniel YoungJeffrey NaberNeil AdamsEdward BalkoPatrick BlosserLinda HratkoGerald KoermerJie XueAdam MoyaChowdary Koripella
    • G01N25/30G01N27/16G01N25/20
    • G01N25/30G01N27/16
    • A differential calorimetric gas sensor (10) which includes a sensing element (12) having a catalytic layer (14) disposed on a multi-layered substrate (26). Catalytic layer (14) includes an active catalyst region (14a) which oxidizes total combustibles within an exhaust gas stream and a reference catalyst region (14b) which oxidizes selective combustibles within the exhaust gas stream. An electrochemical oxygen source (18) is disposed on an opposite side of multi-layer substrate (26) from sensing element (12). An oxygen sensor cell (170) may be incorporated into electrochemical oxygen source (18). The multi-layered substrate (26) includes a plurality of overlaying insulating layers in which an intermediate layer (60) and a bottom layer (64) support primary heaters (58, 62), and in which another intermediate layer (52) supports compensation heaters (50a, 50b). The primary heaters (58, 62) function to maintain sensor (10) at a substantially constant temperature, while the compensation heaters (50a, 50b) function to restore temperature deviations determined by temperature-sensitive elements (46a, 46b) located on an inner layer (48) overlaying the compensation heaters (50a, 50b) resulting from the catalytic reactions taking place at the surfaces (34a, 34b) of the catalyst regions (14a, 14b). The control circuitry (300) operates to control the primary heater (58, 62) and the compensation heaters (50a, 50b), as well as to minimize the response variations of the temperature-sensitive elements (46a, 46b).
    • 一种差压量气体传感器(10),其包括具有设置在多层基板(26)上的催化层(14)的感测元件(12)。 催化层(14)包括氧化废气流内的总可燃物的活性催化剂区域(14a)和在排气流中氧化选择性可燃物的参考催化剂区域(14b)。 电化学氧源(18)设置在多层基板(26)的与感测元件(12)相对的一侧上。 氧传感器单元(170)可以结合到电化学氧源(18)中。 多层基板(26)包括多个覆盖绝缘层,其中中间层(60)和底层(64)支撑主加热器(58,62),并且其中另一中间层(52)支撑补偿 加热器(50a,50b)。 主加热器(58,62)用于将传感器(10)保持在基本上恒定的温度,而补偿加热器(50a,50b)起到恢复由位于内部的温度敏感元件(46a,46b)确定的温度偏差的作用 覆盖在催化剂区域(14a,14b)的表面(34a,34b)处发生的催化反应产生的补偿加热器(50a,50b)的层(48)。 控制电路(300)操作以控制主加热器(58,62)和补偿加热器(50a,50b),以及使温度敏感元件(46a,46b)的响应变化最小化。