| 摘要 |
A reverse rotation control apparatus for a two-cycle engine of a motor vehicle which can be implemented inexpensively while preventing exhaust gas composition and ignition performance from degradation. The apparatus includes a variety of sensors for generating a variety of information signals corresponding to engine operating states, and an ignition control unit (10A) for generating an ignition signal (P) for the engine (1) on the basis of the variety of information. The sensors include at least a rotation sensor (6) for generating a rotation signal (SG) and a reverse rotation switch (23) for generating a reverse rotation command signal (RW). The ignition control unit (10A) includes an ignition timing retard control means for causing an ignition timing of the engine (1) to retard beyond a top dead center (TDC) upon inputting of the reverse rotation command signal (RW), an engine rotation number decision means for deciding whether or not a rotation number (Re) of the engine (1) is lowered to a predetermined rotation number (ReW) suited for the reverse rotation control, and an excessively advanced ignition signal generating means for outputting only once an ignition signal (P) advanced excessively relative to a normal advanced ignition timing when the engine rotation number (Re) is lowered to the predetermined rotation number (ReW) suited for the reverse rotation control.
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