公开(公告)号：WO1982000352A1

公开(公告)日：1982-02-04

申请号：PCT/US1981000745

申请日：1981-06-04

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  FURREY J

IPC: G01L23/22

CPC classification number: F02P5/152 ,  G01L23/225 ,  Y02T10/46

Abstract: Analog signal processing circuit (10) for detecting engine knock. A sensor (11) mechanically resonant at characteristic engine knock frequencies provides an analog signal (12) related to engine knock and engine background noise. An envelope detector (15) provides the signal envelope (16) of the sensor signal. An integrator means (17) provides an average signal (18) related to the average of the envelope signal while an attenuator (19) and subsequent filter (20) (integrator) provide an integrated and attenuated signal (21) which responds faster to amplitude changes in the envelope signal (16) than the average signal (18). The integrated and attenuated signal level is set below the average signal level for conditions of no-knock. A comparator (23) receives both the average signal (18) and the integrated and attenuated signal (21) and provides an output signal (27) indicating knock detection in response to the amplitude of the integrated and attenuated signal exceeding the amplitude of the average signal. Preferably the knock detection output (27) of the comparator (23) is latched and the comparator is reset by periodic engine pulses (26).

Abstract translation: 用于检测发动机爆震的模拟信号处理电路（10）。 在特征性引擎爆震频率下机械共振的传感器（11）提供与发动机爆震和发动机背景噪声相关的模拟信号（12）。 包络检测器（15）提供传感器信号的信号包络（16）。 积分器装置（17）提供与包络信号的平均值相关的平均信号（18），而衰减器（19）和后续滤波器（20）（积分器）提供积分和衰减信号（21），其响应更快到振幅 包络信号（16）的变化大于平均信号（18）。 集成和衰减的信号电平设置在无敲击条件下的平均信号电平以下。 比较器（23）接收平均信号（18）和积分和衰减信号（21），并响应于积分和衰减信号的振幅超过平均值的幅度而提供指示爆震检测的输出信号（27） 信号。 优选地，比较器（23）的爆震检测输出（27）被锁存，并且比较器由周期性的发动机脉冲（26）复位。