| 摘要 |
The method involves of varying the opening and closing of combustion chamber inlet and exhaust valves as a function of the load on the engine, and a prolonged retention of the burned gases in the combustion chamber prior to admitting a fresh charge, minimising the mixing of the fresh and burned gases. The retention of burned gases in the combustion chamber is carried out by delaying the closure of the exhaust valve to beyond the piston tdc point or preventing its opening before bdc, and restricting the duration for which the exhaust valve is open to only a portion of the piston's upward travel. The procedure can be applied, for example, by installing a variable throttle (10) in the exhaust duct (2) after the exhaust valve (12). |
