Filter damper for piezo-electric sensor to detect fuel injection timing of engine
专利汇可以提供Filter damper for piezo-electric sensor to detect fuel injection timing of engine专利检索，专利查询，专利分析的服务。并且PURPOSE: To make easier discrimination when the signal of afterflow is processed by connecting a condenser and an inductance, set up to specific value, in parallel with piezo-electric element in order to fetch only signal generated on the basis of injection sound.
CONSTITUTION: The filter damper device 2 connected with the piezo-electric sensor 1 consists of the resistance element R and the condenser C and the inductance L, connected in parallel with each other to the sensor 1. The values of C and L are set up such that the resonance frequency f
s =1/2π(LC)
1/2 becomes 170kW200kHz and also the characteristic impedance (L/C)
1/2 becomes 1,000W10,000. Thus, of voltage signals generated by the piezo-electric element 1 on the basis of sounds generated by the fuel injection value, the voltage signal of a frequency near the resonance frequency of the damper device 2 is passed to the output terminal 4 without division, and the other signals are vanished or reduced.
COPYRIGHT: (C)1981,JPO&Japio，下面是Filter damper for piezo-electric sensor to detect fuel injection timing of engine专利的具体信息内容。
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