| 摘要 |
A two-cycle internal combustion engine is of the type having one cylinder ( 2 ), one piston ( 4 ) with connecting rod, one head ( 3 ) closing the cylinder ( 2 ) on the explosion chamber side, one crankcase ( 12 ) closing the cylinder ( 2 ) on the side opposite the explosion chamber, one spark plug ( 5 ) inserted in the head, and one burnt gas exhaust pipe ( 8 ) with inlet port opening onto the internal surface of the cylinder ( 2 ) near bottom dead center of the piston ( 4 ). One air input duct ( 6 ) with combustion chamber inlet ports ( 13 ) is located near bottom dead center of the piston ( 4 ) and inlet ports are located either in the cylinder ( 2 ) near the crankcase ( 12 ) or in the crankcase. One duct ( 7 ) lets lubrication oil into the air input duct ( 6 ) and one sensor ( 9 ) senses rotation speed and angular position of the drive shaft. One fuel injector ( 1 ) is inserted in the cylinder wall ( 2 ) with an inclination such that the fuel jet produced thereby penetrates into the combustion chamber and impacts on the wall of the head ( 3 ) near the spark plug ( 5 ) and at a position such that the piston ( 4 ), at its top dead center, is placed between the injector ( 1 ) and the combustion chamber. A control unit ( 10 ), based on the signals output by the sensor ( 9 ), synchronizes the cyclic movement of the drive shaft with the sparking times of the spark plug ( 5 ) and the opening time of the injector ( 1 ), and also regulates the quantity of fuel injected upon each cycle of the engine based on rotation speed, engine load and accelerator regulation set by the user.
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