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A Simple QC Test for Knock Sensors
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English
Abstract
A simple set-up for quick and purely electrical QC testing of knock sensors is described in this paper. The main goal is to measure the “impedance” frequency response function of the sensors. The advantages of the test procedure described in this paper are as follows: Simple “pseudo” one channel measurement, from the operator's point of view. Electrical testing, i.e. no need for shakers, power amplifiers, elaborate fixtures etc.. Pulse excitation, thus very fast - in the order of 100ms for one measurement test. No averaging needed. Standard frequency response function display is used, i.e. no complex postprocessing needed. The only requirement is a small junction box with the necessary transformer and some electronics. The power supply for the junction box is the analyzer. The testing method can be extended to other types of transducers such as accelerometers.
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Citation
Gade, S., Matzen, S., and Herlufsen, H., "A Simple QC Test for Knock Sensors," SAE Technical Paper 972002, 1997, https://doi.org/10.4271/972002.Also In
References
- “Automotive Handbook” 3rd BOSCH 1-65091-372-X
- “Piezoelectric Accelerometers and Vibration Pramplifiers” Brüel & Kjær Handbook
- Gade Herlufsen “Windows to FFT Analysis” Brüel & Kjær Technical Reviews nos. 3 & 4 1987
- Herlufsen “Dual Channel FFT Analysis” Brüel & Kjær Technical Reviews nos. 1 & 2 1984