| Popis: |
Use of a high expansion ratio (high compression ratio) in order to increase indicated work, or the downsizing of engine displacement and the use of a turbocharger in order to increase the frequency of use of the high-efficiency operating range, have been proposed as methods of improving the thermal efficiency of spark ignition engines, and are already in commercial use. However, the knock restricts thermal efficiency in both of these methods, and it will be essential to address this issue in order to realize further improvement in engine thermal efficiency. |
