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首页> 外文期刊>Procedia Manufacturing >Variable Valve Timing for a Camless Stepping Valve Engine
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Variable Valve Timing for a Camless Stepping Valve Engine

机译：无透雕阀发动机的可变气门正时

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Variable valve timing (VVT) enables the valve events to vary with RPM for optimum engine performance. It alters the timing on the camshaft using pneumatic, hydraulic or electromechanical means. The Cameless Stepping Valve system uses software controlled valve events. Here, VVT is achieved by advancing/retarding valve events using only the direction of the piston and interpolated virtual angles on the flywheel. The engine model used has an optimum RPM of 24000, which translates to a period of 2.5mS. A 10angle increment on the flywheel corresponds to 6.9μS. As a result, a retardation/advance of 10would mean that the valve will open/close 6.9μS after the current/previous TDC. A 9bit real-time digital counter was triggered to count the calculated angles at every Otto Cycle so that advance/retard is updated at every RPM. In this project, it was demonstrated that valve event control is possible using interpolation of virtual angles on the flywheel, replacing a multi-tooth timing wheel. The proposed technique is more accurate and robust.
机译：可变气门定时（VVT）使阀门事件能够随着RPM而变化，以实现最佳发动机性能。它使用气动，液压或机电装置改变凸轮轴上的时序。无丝步进阀系统使用软件受控阀门事件。这里，通过仅使用活塞的方向和飞轮上的内插虚距来实现通过推进/延迟阀事件来实现VVT。使用的发动机型号的最佳RPM为24000，转化为2.5ms的时间。飞轮上的10angle增量对应于6.9μs。结果，延迟/前进10发生意味着在当前/上一个TDC之后阀门将打开/关闭6.9μs。触发9bit实时数字计数器以在每个OTTO循环处计算计算的角度，以便在每个RPM处更新预先/延迟。在该项目中，证明了使用飞轮上虚拟角度的插值来实现阀门事件控制，更换多齿时序轮。所提出的技术更准确且坚固。

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