EXHAUST TIMING CONTROL SYSTEM FOR A TWO-CYCLE ENGINE

摘要

THE PRESENT INVENTION PROVIDES AN EXHAUST TIMING CONTROL SYSTEM (10) FOR A TWO-CYCLE ENGINE, CAPABLE OF ACHIEVING THE SELF-CLEANING OF A CONTROL VALVE (11) WITHOUT DETERIORATING THE DRIVING PERFORMANCE OF THE TWO-CYCLE ENGINE. AN EXHAUST TIMING CONTROL SYSTEM (10) FOR A TWO-CYCLE ENGINE IS PROVIDED WITH A CONTROL VALVE (11) FOR OPENING AND CLOSING THE UPPER PART OF THE EXHAUST PORT (7) TO CHANGE THE VERTICAL POSITION OF THE UPPER END OF THE EXHAUST PORT (7) SUBSTANTIALLY, AND THE CONTROL VALVE (11) IS OPENED WHILE THE ENGINE SPEED IS IN A HIGH-SPEED RANGE AND IS CLOSED WHILE THE ENGINE SPEED IS IN A LOW-SPEED RANGE. THE CONTROL VALVE (11) IS SET FORCIBLY IN AN OPEN STATE UPON THE DETECTION OF THE DECREASE OF THE ENGINE SPEED PAST A THRESHOLD ENGINE SPEED. (FIG. 9).