| 摘要 |
PROBLEM TO BE SOLVED: To perform control of an electromagnetically driven type exhaust valve for an engine by a proper control system. SOLUTION: In an engine provided with two electromagnetically drive type exhaust valves at each cylinder, in a low load state, two exhaust valves are alternately driven during a very low temperature (S1-S3). During low temperature operation, only a specified one exhaust valve is driven (S1, S2→S4, S5). During medium load operation, driving is effected by making the opening timings of two exhaust valves lag from each other (S1→S6, S7). During high load operation, the two exhaust valves are simultaneously driven (S1→S6, S8).
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