公开(公告)号：US09175582B1

公开(公告)日：2015-11-03

申请号：US14338873

申请日：2014-07-23

申请人： Zhijian James Wu ,  Steven J Gorgas ,  Brian P Gebby ,  Ethan E Bayer ,  Kevin V Rafalo ,  Julian D John ,  Jacob A Kohn

发明人： Zhijian James Wu ,  Steven J Gorgas ,  Brian P Gebby ,  Ethan E Bayer ,  Kevin V Rafalo ,  Julian D John ,  Jacob A Kohn

IPC分类号： F01L1/34 ,  G01M15/04 ,  F02D41/04

CPC分类号： F02D41/0097 ,  F01L13/0015 ,  F01L2800/11 ,  F01L2820/041 ,  F02D41/0002 ,  F02D41/04 ,  F02D41/221 ,  F02D2041/001 ,  F02D2041/228 ,  G01M15/042 ,  Y02T10/42

摘要： An engine system and method for variable valve lift (VVL) diagnostic techniques are provided. In one exemplary implementation, the techniques include receiving, at a controller, a camshaft position signal indicative of detected edges of teeth of a camshaft toothed member that is coupled to a camshaft of an engine. The camshaft is configured to actuate a VVL system, which is configured to control a lift of a valve of the engine. The techniques also include calculating, at the controller, a camshaft speed signal indicative of a rotational speed of the camshaft based on the camshaft position signal. A valve stuck index (VSI) value is then calculated, at the controller, based on the camshaft speed signal. The techniques also include determining, at the controller, whether the valve is stuck based on a comparison of the VSI value to a predetermined threshold.

摘要翻译： 提供了一种用于可变气门升程（VVL）诊断技术的发动机系统和方法。 在一个示例性实施例中，技术包括在控制器处接收指示联接到发动机的凸轮轴的凸轮轴齿形构件的齿的检测到的边缘的凸轮轴位置信号。 凸轮轴构造成致动VVL系统，其被构造成控制发动机的阀的升程。 这些技术还包括在控制器处基于凸轮轴位置信号来计算指示凸轮轴的转速的凸轮轴速度信号。 然后根据凸轮轴转速信号在控制器处计算阀门卡死指数（VSI）值。 这些技术还包括在控制器处基于VSI值与预定阈值的比较来确定阀是否被卡住。