This application is a 371 of PCT/EP2008/064542 filed Oct.27, 2008, which in turn claims the priority of DE 10 2007 054 547.0 filed Nov.15, 2007, the priority of both applications is hereby claimed and both applications are incorporated by reference herein.这个应用程序是一个371的PCT / EP2008/064542申请10月27日,2008年,进而主张德10 2007 054 547.0提出的优先级11月15日,2007年,两个应用程序的优先级是在此宣称,两个应用程序中通过引用。
FIELD OF THE INVENTION 发明的领域
The invention relates to an engine control strategy for a hydraulic camshaft adjuster with mechanical central locking, in particular a vane-type hydraulic camshaft adjuster, having the features of the preamble of claim 1.本发明涉及发动机控制策略与机械液压凸轮轴调节器中央锁定,尤其是叶片式液压凸轮轴调节器,在权利要求1的序言的特点。 Camshafts of internal combustion engines are usually driven by crankshafts via a chain or a toothed belt, and here, are continuously adjusted in a closed control loop, with typical adjustment ranges being 40° to 60° crank angle.Crank angles to be set are stored in characteristic maps.Adjustments take place for example hydraulically, fed from the engine oil circuit by means of an electrically actuated control valve, and
1 permit optimized valve control times by means of the parameters of engine load and rotational speed.Depending on the engine concept and number of adjusters, it is thus poible to obtain a considerable reduction in fuel consumption and exhaust-gas emiions and an increase in power and torque.凸轮轴的内燃机通常是由曲轴通过链或齿形带,在这里,不断调整在一个封闭的控制回路,典型的调整范围是40°60°曲柄角度。曲柄角度设置存储在特征地图。例如液压调整发生,美联储从发动机油路通过一个电驱动控制阀,并允许通过优化阀控制倍发动机负载和转速的参数。根据发动机概念和数量的调节器,因此可以获得相当大的减少燃料消耗和废气排放,提高功率和扭矩。
In the state in which they are not hydraulically braced, camshafts and, fixedly connected thereto, rotors of a hydraulic camshaft adjuster tend to perform acoustically noticeable oscillations on account of alternating torques on the camshaft.Said oscillations can be prevented by means of a mechanical connection of the rotor to the stator and therefore to the crankshaft.A known mechanical connection of said type is the camshaft adjuster locked in the center, that is to say between the LATE and EARLY end stops.Two locking pistons which are axially movable in the rotor, and which are also referred to as pins, can be preed by means of spring force into a locking slot which is positioned opposite in an axially arranged locking cover which is fixedly screwed to the stator, and thereby
2 lock the rotor and stator to one another in a rotationally fixed manner.Unlocking takes place hydraulically by means of oil preure from the lubricating oil circuit of the engine, which oil preure is deflected to the locking pistons by means of a controlled supply of current to a solenoid valve and moves said locking pistons axially out of the locking slot into the rotor such that the rotor and stator are rotatable relative to one another.的状态,他们不是液压支撑,凸轮轴,固定连接,转子的液压凸轮轴调节器倾向于执行听觉上明显的振荡的凸轮轴上的交变扭矩。说振荡可以预防通过机械连接的转子定子,因此曲轴。一个已知的机械连接的类型是凸轮轴调节器锁在中心,也就是说之间初末结束停止。两个活塞锁定在转子轴向移动,也被称为别针,可以通过弹力压成相反的锁槽定位在一个轴向锁定封面安排固定螺纹定子,从而锁定转子和定子旋转固定的方式。解锁发生液压通过油压润滑油电路的引擎,这油压偏转到锁定活塞通过一个电磁阀控制的电流供应和行动表示活塞轴向锁定的锁槽的转子,转子和定子旋转相对于另一个。
Non-hydraulically braced states are typical of the starting of the engine, during which the low rotational speed of the oil pump and the correspondingly low oil preure in the lubricating circuit of the engine may be insufficient for an oil preure which holds the position of the rotor relative to the stator.As the rotational speed of the engine increases, friction torques are generated on the camshafts counter to the rotational
3 direction thereof, which friction torques aist central locking if the rotor of the camshaft adjuster has been shut down between the central locking position (CLP) and the EARLY end stop.However, if the rotor of the camshaft adjuster has been shut down between the LATE end stop and CLP upon the stopping of the engine, the adjustment of said rotor by means of friction torques takes place exclusively in the LATE direction, and it is not poible for the rotor to reach the CLP without sufficient oil preure.Non-hydraulically支撑国家的典型的引擎开始,在此期间的低转速油泵和相应的低油压在发动机的润滑电路可能不足为油压持有相对于定子转子的位置。随着发动机转速的增加,摩擦力矩产生的凸轮轴与转动的方向,这些摩擦扭矩协助中央锁定的转子凸轮轴调节器被关闭中央锁定位置(CLP)和早期结束停止。然而,如果转子之间的凸轮轴调节器被关闭末结束停止,CLP的停止发动机,调整表示转子的摩擦扭矩发生只在已故的方向,并为转子是不可能达到CLP没有足够的油压。 U.S.Pat.No.6,450,137 B2 discloses a camshaft adjuster whose rotor can be pushed hydraulically relative to the stator either to the EARLY end stop or to the LATE end stop.An electrical control valve connects an inlet to oil under preure from a pump and an unpreurized return to an oil reservoir alternately to the EARLY end stop or the LATE end stop.The electric control valve is adjusted by a control device.To prevent noises from the camshaft drive, it is the aim for the rotor to be rotated
4 mechanically relative to the stator by the crankshaft during the starting of the engine in such a way that the rotor can be locked centrally with the stator.However, if the rotor of the camshaft adjuster has been shut down between the LATE end stop and CLP upon the stopping of the engine, the adjustment of said rotor by means of friction torques takes place exclusively in the LATE direction, and the CLP can thus be reached only with difficulty and unreliably, such that the acoustically noticeable oscillation of the camshaft is not prevented.美国帕特。6450137号B2披露的凸轮轴调节器可以推液压相对于定子转子早期结束停止或结束停止。电子控制阀连接一个进口石油的压力下一个泵和一个非承压的回到交替油藏早期结束停止或结束停止。电动调节阀是由控制装置调整。防止噪音凸轮轴驱动,它的目标是旋转机械的转子相对于定子的曲轴在发动机的起动的方式可以锁定转子与定子集中。然而,如果转子之间的凸轮轴调节器被关闭末结束停止,CLP的停止发动机,调整表示转子的摩擦扭矩发生只在已故的方向,和CLP因此可以达到只有困难和unreliably,这样的听觉上明显的振荡凸轮轴不阻止。
