| 摘要 |
<p>A combination, in an expansible chamber engine having at least one cam driven piston (174), of a piston drive cam (18) profile that alternately drives the piston to a higher or lower top dead center TDC position producing different expansion ratios, of a valve operating arrangement that shifts firing position between the two TDC positions selecting an expansion ratio, of a charge volume limiting system that limits the charge by controlling intake valve open duration and reduces throttling losses, and of a control system that limits the maximum charge volume or intake displacement in accordance with the firing TDC and the supercharged pressure thereby avoiding pre-ignition firing and allowing supercharger compression to replace cylinder compression instead of adding to it.</p> |
