| 摘要 |
The present invention provides a controlled-compression direct-power-cycle engine for performing the direct-power-cycle, wherein the air is compressed with three compression processes and cooled to a controlled temperature before ignition, the engine power output is controlled by both the compressor-transmission and the servo-intake-valve; the three compression processes are the initial-compression-process, the intermediate-compression-process, the final-compression-process, wherein, the initial-compression-process is performed by the turbocharger, the intermediate-compressor-process is performed by a screw type compressor, a rotary type compressor, or a scroll type intermediate-compressor, the final-compression-process is performed by the pistons of the combustion chambers; said intermediate-compressor is coupled to the compressor-transmission for adjusting the compression-capacity according to the instruction signals from the engine control unit, which computes the required compression-capacity by the user's power demand and the pressure in the cooling tank; said final-compression-process adjusts the actual-pressure-ratio with the actuation-time of the servo-intake-valve; said servo-intake-valve is opened for 5-60 degree of crankshaft rotation and is shut at a point between 90 degree BTC and 10 degree BTC according to instruction signals from the engine control unit; wherein the compressor-transmission is set to provide a higher airflow and said servo-intake-valve is shut at an earlier crankshaft reference angle to increase the actual-pressure-ratio of the final-compression-process for operating the direct-power-cycle at a high power output, whereas the compressor-transmission is set to provide a lower airflow and said servo-intake-valve is shut at a later crankshaft reference angle to decrease the actual-pressure-ratio of the final-compression-process for operating the direct-power-cycle at a lower power output.
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