A unit of autoscan engine-combustion-process analyzer incorporating
CAS software was used to study engine combustion. A
high-revolution encoder was installed on the frame bolted onto
the frame of the engine test bed. This flexible coupling enabled
the encoder to function well under vibration condition. Then,
the encoder was calibrated against the mark top dead center
(TDC) of the crankshaft. A Thermo-COMP Quartz pressure sensor
6061B Kistler water-cooled precision cylinder pressure sensor was
installed to study pressure rise and the peak pressure of the combustion
system. A workshop-machined adapter was used to mount
the sensor in one existing bore for glow plug. Cylinder pressure
signals were passed onto a 5041C-Kistler-charge amplifier before
being recorded on a computer data-acquisition system.