| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for controlling the valve timing of a DOHC engine capable of performing feedback control of the closing timings of suction and exhaust valves in optimum to the operation state of an engine and with high precision. SOLUTION: This method for controlling the valve timing of a DOHC engine 1 is such that VVT(variable valve timing mechanisms) 25 and 26 are situated on suction and exhaust cam shafts 17 and 18, rotation of a crank shaft 6 is transmitted to the exhaust cam shaft 18 through the VVT 26 on the exhaust side, rotation of the exhaust cam shaft 18 is transmitted to the suction cam shaft 17 through the VVT 25 on the suction side, and the closing timings of the suction and exhaust valves driven by the cam shafts 17 and 18, respectively, are controlled according to the operation state of the engine 1. The target angle of the exhaust cam shaft 18 represented by a crank reference and the target angle of the cam shaft 17 on the suction side represented by a differential angle from the target angle is determined from a preset table, and a differential angle from the exhaust cam shaft 18 of the suction cam shaft 17 is measured, and feedback control of the YYT 25 on the suction side is executed such that the measuring value of the differential angle of the suction cam shaft 17 coincides with the target angle (a differential angle).
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