Walsh-Optimum_Knock_Sensor_Location_(Final_Paper)[1].pdf (396.62 kB)
Optimum knock sensor location through experimental modal analysis of engine cylinder block
conference contribution
posted on 2011-12-05, 11:19 authored by Yatin V. Chaudhary, Stephen Walsh, Om Prakash Singh, C. SubramoniamThe knock sensor is provided on an engine cylinder block to detect abnormal engine combustion (knocking) and to provide feedback to engine control unit (ECU). The ECU then modifies the engine input and avoids knocking. A commonly used knock sensor is an accelerometer that detects cylinder wall vibration and estimates knocking of the engine. Selecting the location of a knock sensor in many cases involves a challenging trial and error approach that depends upon the measurement of the knock signal at many locations on engine structure. However, a cylinder block exhibits many structural resonances. Thus, a large vibration signal at the surface of cylinder block can be either due to knocking of the engine or due to the resonances of the cylinder block structure because of normal excitation forces. Hence, this conventional method does not always yield reliable results. The aim of the work reported in this paper is to experimentally determine the inherent dynamic characteristics of a cylinder block and to combine this with a calculation of the fundamental knock frequency and, thus, to identify the optimum location for the knock sensor.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
SAE 17th Small Engine Technology ConferenceIssue
SAE Technical Paper 2011- 32-0637Citation
CHAUDHARY, Y.V. ... et al, 2011. Optimum knock sensor location through experimental modal analysis of engine cylinder block. Presented at: the 17th Small Engine Technology Conference (SETC 2011). 8th-10th November 2011, Sapporo, Japan.Publisher
© SAE Japan and SAE InternationalVersion
- VoR (Version of Record)
Publication date
2011Notes
This is a conference paper.Publisher version
Book series
JSAE paper; 20119637Language
- en