| 摘要 |
Processing conditions are determined on the basis of an operation range. After IG-OFF, an intake valve opening timing is advanced to 20° CA BTDC, and an exhaust valve closing timing is retarded to 20° CA ATDC. By controlling the intake and exhaust valve timings as described above, it is possible to reduce the fuel sticking to the intake passage. Particularly in the case of cold engine starting before activation of the catalyst, it is possible to prevent direct exhaust of HC emissions and accordingly to reduce emissions because of the decreased amount of fuel sticking to the intake passage.
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