Process for determining and evaluating the combustion pressure of an
internal combustion engine
    1.
    发明授权
    Process for determining and evaluating the combustion pressure of an internal combustion engine 失效
    用于确定和评估内燃机的燃烧压力的方法

    公开(公告)号:US5020360A

    公开(公告)日:1991-06-04

    申请号:US477981

    申请日:1990-04-27

    摘要: A process for determining the combustion pressure of an internal combustion engine is proposed. Conventional processes of this type have the disadvantage that the determination methods are very costly. Furthermore, stringent requirements are made of the sensors to be used. By comparison, the process proposed here is distinguished in that the combustion pressure is calculated from the combustion chamber pressure (p(.alpha.)) determined with simple sensors, by determining the compression pressure (p.sub.k (.alpha.)). These values for the compression pressure are subtracted from the combustion chamber pressure in order to calculate the combustion pressure p*(.alpha.)). Preferably, the course of the compression pressure is obtained by measuring the combustion chamber pressure values during the compression until top dead center in the working phase and storing them in a memory. The compression values occurring after top dead center are obtained by reflection at an axis extending through top dead center, resulting in a symmetrical curve course for the compression pressure. In this way, the combustion pressure can be calculated particularly simply.

    摘要翻译: PCT No.PCT / DE88 / 00657 Sec。 371日期1990年04月27日第 102(e)日期1990年4月27日PCT提交1988年10月26日PCT公布。 WO89 / 03983 PCT出版物 日期:1989年5月5日。提出了一种用于确定内燃机的燃烧压力的方法。 这种常规方法的缺点是确定方法非常昂贵。 此外,要使用的传感器要求严格。 相比之下,这里提出的方法的区别在于,通过确定压缩压力(pk(α)),从由简单传感器确定的燃烧室压力(p(α))计算燃烧压力。 为了计算燃烧压力p *(α),从燃烧室压力中减去压缩压力的这些值。 优选地,压缩压力的过程通过在压缩期间测量燃烧室压力值直到工作阶段的上止点并将其存储在存储器中来获得。 通过在延伸穿过上止点的轴上的反射获得在上止点之后发生的压缩值,导致压缩压力的对称曲线。 以这种方式,可以特别简单地计算燃烧压力。

    Method of detecting knock in internal combustion engines
    2.
    发明授权
    Method of detecting knock in internal combustion engines 失效
    检测内燃机爆震的方法

    公开(公告)号:US5220821A

    公开(公告)日:1993-06-22

    申请号:US746102

    申请日:1991-08-15

    IPC分类号: F02P5/152 F02P17/12 G01L23/22

    摘要: To detect knock, a detected signal relating to a combustion property in a cylinder of an engine is generated. The detected signal (I) is filtered to select those portions characteristic of knock. However, the filtered signal (I') is only investigated to determine whether knock has occurred, when the unfiltered detected signal (I) meets at least two, and usually four, preset conditions. One preset condition is that the detected signal (I) must have reached a predetermined threshold value (I.sub.s). Other preset conditions for the detected signal include the following: that the maximum value (I.sub.max) of the detected signal (I) is below a predetermined critical value (I.sub.max crit) and that within a predetermined crank angle difference (.DELTA..alpha..sub.F), after reaching the threshold value (I.sub.s), during a predetermined time interval (.DELTA.t) the detected signal (I) does not decrease by more than a first critical amount (.DELTA.I.sub.AbC) and then does not rise by more than a second critical amount (.DELTA.I.sub.AnC).

    摘要翻译: 为了检测爆震,产生与发动机气缸中的燃烧特性相关的检测信号。 对检测到的信号(I)进行滤波以选择敲击特征的部分。 然而,当未滤波的检测信号(I)满足至少两个并且通常为四个预设条件时,仅研究滤波信号(I')以确定是否发生了敲击。 一个预设条件是检测到的信号(I)必须已经达到预定的阈值(Is)。 检测信号的其他预设条件包括以下:检测信号(I)的最大值(Imax)低于预定临界值(Imax crit),并且在预定的曲柄角差(DELTAαF)之后,最大值 达到阈值(Is)时,在预定时间间隔(DELTA t)期间,检测信号(I)没有减少超过第一临界量(DELTA IAbC),然后不上升超过第二临界量 DELTA IAnC)。