Abstract
Monitoring of combustion in a cylinder is getting important to operate an engine safely and to do most suitable combustion for environment prevention for an electronically controlled marine diesel engine.
Generally a pressure sensor installed on a cylinder is used to monitor combustion condition but there are problems such as durability of the sensor under severe environment such as high temperature and high pressure.
As new combustion monitoring technology, authors installed a strain gauge on a cylinder head bolt and installed a load washer between a cylinder head bolt and a nut. They are tested by a marine diesel engine and signals from them are analyzed.
The signal of the strain gauge or the load washer had strong correlation with the cylinder pressure and it is possible to estimate the ignition time by the signal of the strain gauge or the load washer.
