| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve ultra-high-efficiency for thermal efficiency by adopting ultra-rapid combustion using a centralized combustion chamber and a multi-point plug, and a mirror cycle, and further to achieve ultra-low NOx by significantly delaying the ignition timing of a spark gap through an ultra-high-efficiency combustion method.SOLUTION: Around a combustion chamber 1, a squish part S including a fine gap between a piston top surface at a top dead center position and a cylinder head wall surface is formed and defined as the centralized combustion chamber. Two or more spark gaps oppose the combustion chamber 1. The ignition timing of the spark gap is controlled to a compression top dead center or after that in a high-load area. Further, in a low-load area, close timing of suction valves 3 and 3' is changed by a valve opening/closing timing control device 15 which varies opening/closing timing of the suction valves. Therefore, a mirror cycle is implemented while reducing an effective suction step.</p> |
