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    • 6. 发明授权
    • Variable valve timing system
    • 可变气门正时系统
    • US07938088B2
    • 2011-05-10
    • US12159987
    • 2007-08-29
    • Zenichiro MashikiYasumichi InoueNoboru TakagiHaruyuki Urushihata
    • Zenichiro MashikiYasumichi InoueNoboru TakagiHaruyuki Urushihata
    • F01L1/34
    • F02D41/0002F01L1/352F01L1/356F02D41/221F02D2041/001F02D2041/2027Y02T10/42
    • An ECU transmits a pulsed operation command signal, indicating operation commands for an electric motor used as a VVT actuator, to an electric-motor EDU. The electric-motor EDU recognizes the combination of the direction in which the actuator should be operated (actuator operation direction) and the control mode based on the duty ratio of the operation command signal, and the rotational speed command value based on the frequency of the operation command signal. The electric-motor EDU controls the electric motor according to the control commands. The duty ratio indicating the combination is set such that even if the duty ratio is falsely recognized, a false recognition concerning the actuator operation direction is prevented, such false recognition causing the valve phase to change in an undesirable direction, and even if the actuator operation direction is falsely recognized, the rate of change in the phase is restricted.
    • ECU向电动机EDU发送用于指示用作VVT致动器的电动机的操作命令的脉冲操作指令信号。 电动机EDU基于操作指令信号的占空比和转速指令值,识别执行器应该被操作的方向(致动器操作方向)与控制模式的组合, 操作指令信号。 电动机EDU根据控制指令控制电动机。 设定表示组合的占空比,使得即使占空比被错误识别,也可以防止对致动器操作方向的错误识别,这种错误识别导致阀相在不期望的方向上变化,并且即使致动器操作 方向被错误地认定,阶段的变化率受到限制。