| 摘要 |
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.
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