| 摘要 |
The present invention aims to prevent cavitation caused by rapid acceleratio n at startup of a jet propulsion boat, and, at the same time, aims to improve acceleration performance. Provided is an engine control system that retards the ignition timing when the engine speed rises rapidly at startup of a jet propulsion boat. The engine control system includes a cavitation-control--mode determination unit, which starts a cavitation-contr ol mode when an engine speed not faster than rpm is maintained for seconds or longer. During the normal sailing, the ignition timing is set by a first ignition-timing setting means. After detecting the mode by the cavitation-control-mode determination unit, an engine speed that is raised up to a speed not slower than 3200 rpm makes switching means (ignition-timing setting-means switch unit) select a second ignition-timing setting means. The second ignition- timing setting means retards the ignition timing from the value for the normal sailing when the engine speed becomes 6500 rpm or faster. Along with the switching of the map for the retard of the ignition timing, the boost pressure control command upper-limit value is switched to the value for the startup, which is smaller than the value for the normal sailing.
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