| 摘要 |
<p>The invention discloses an internal combustion engine with super expansion. The engine includes a cylinder (1) and a piston (2). When the piston arrives at the end point of the compression stroke, the compression pressure of intake volume achieving the requested power is in the range of 1.8Mpa to 5Mpa, thereby the combustion temperature and the combustion pressure are improved. The working volume of the cylinder is designed by the super expansion rate depending on the effective pressure for working, wherein the working volume is larger than the intake volume. Making use of the heat energy of combustion gas produced in constant volume expansion stroke, the gas continues to expand in adiabatic condition to form the condition of super expansion work. A part of cooling water jacket is provided on the upper portion of the cylinder. Heat preservation means, but no cooling water jackets are provided on the lower portion of the cylinder, in order to avoid heat loss during the super expansion process. The decrease of the diameter of intake valve, the increase of the diameter of exhaust valve, and the reduction of the lead angle of exhaust can further enhance the effect of super expansion work. The invention can improve the heat efficiency notably, reduce the fuel consumption and pollution.</p> |
