Injection pulse width calculating process for internal combustion engine, involves modeling pressure in combustion chamber by taking into account relation between polytropic coefficient and operating parameters of internal combustion engine

摘要

The process involves modeling the pressure in a combustion chamber (12) of an internal combustion engine (10) by calculating and utilizing a relation defining variations of polytropic state. The pressure modeling by calculation takes into account a relation between the polytropic coefficient and operating parameters of the internal combustion engine. An independent claim is also included for a control apparatus calculating injection pulse width.