公开(公告)号：WO1997014025A1

公开(公告)日：1997-04-17

申请号：PCT/US1996011403

申请日：1996-07-11

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  HALL, Dale

IPC: G01L23/22

CPC classification number: H01L41/1132 ,  G01L23/222 ,  G01P15/0907

Abstract: A linear type knock sensor (100) is disclosed. It has: a housing assembly (126) adapted to being connectable with an engine and having output leads for providing an output signal to an electronic interface; a transducer assembly having a plurality of piezoelectric ceramic wafers (110, 116) configured to provide a knock signal substantially greater than a noise signal; the piezoelectric ceramic wafers (110, 116) being electrically connected in parallel to provide a high voltage sensitivity at a predetermined capacitance, and wherein the piezoelectric ceramic wafers (110, 116) are placed with a polarized surface of a first wafer facing an opposite polarized surface of a second wafer with both surfaces having a substantially same electrical charge adapted to minimize noise.

Abstract translation: 公开了线性爆震传感器（100）。 它具有：壳体组件（126），其适于可与发动机连接并具有用于向电子接口提供输出信号的输出引线; 换能器组件，其具有多个压电陶瓷晶片（110,116），其配置成提供基本上大于噪声信号的爆震信号; 所述压电陶瓷晶片（110,116）并联电连接以在预定电容下提供高电压灵敏度，并且其中所述压电陶瓷晶片（110,116）设置有面向相反极化的第一晶片的极化表面 具有两个表面的第二晶片的表面具有适于最小化噪声的基本相同的电荷。