CPC F02D 13/0207 (2013.01) [F01L 1/08 (2013.01)] | 6 Claims |
1. A valve control apparatus for an engine that opens and closes an exhaust valve and an intake valve of the engine in conjunction with a crankshaft of the engine, the valve control apparatus comprising:
an exhaust valve opening and closing device opening and closing the exhaust valve during a first exhaust valve opening period; and
an intake valve opening and closing device opening and closing the intake valve during a first intake valve opening period,
wherein
the exhaust valve opening and closing device further opens and closes the exhaust valve during a second exhaust valve opening period relatively shorter than the first exhaust valve opening period within the first intake valve opening period,
the intake valve opening and closing device further opens and closes the intake valve during a second intake valve opening period relatively shorter than the first intake valve opening period within the first exhaust valve opening period,
a piston reciprocating within a cylinder of the engine is located at a top dead center when a crankshaft rotation angle is 0 degrees, 360 degrees, and 720 degrees, and is located at a bottom dead center when the crankshaft rotation angle is 180 degrees and 540 degrees,
a maximum opening point of the exhaust valve in the second exhaust valve opening period falls within a range of 487 degrees to 507 degrees based on the crankshaft rotation angle,
the first intake valve opening period falls within a range of 310 degrees to 590 degrees based on the crankshaft rotation angle,
a maximum opening point of the intake valve in the second intake valve opening period falls within a range of 216 degrees to 236 degrees based on the crankshaft rotation angle, and
the first exhaust valve opening period falls within a range of 120 degrees to 390 degrees based on the crankshaft rotation angle.
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