Device for adjusting the phase position between the camshaft and the crankshaft
A device for adjusting the phase position between a camshaft and a crankshaft is provided. A quick and precise electronic adjustment for mechanical adjustment devices for adjusting the phase position between a camshaft and a crankshaft have previously not been known. The adjustment device is a component of an electronic circuit, either automatically adjusting the desired phase position directly or indirectly via another parameter, with the circuit including at least one loop between the control device and the adjustment path, by which a quick and precise adjustment can be achieved. Such arrangements are needed for a quick and precise adjustment of the phase position of a camshaft in reference to a crankshaft in internal combustion engines.
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This application is a continuation of PCT/DE2003/003620, filed Oct. 31, 2003, which is incorporated herein by reference as if fully set forth.
BACKGROUNDThe invention relates to a device for adjusting the phase position between a camshaft and a crankshaft of an internal combustion engine.
In internal combustion engines, the crankshaft drives one or more camshafts via a primary drive, provided, for example, as a toothed belt. For this purpose, a camshaft timing gear is mounted to each camshaft, by which the primary drive drives the camshaft. Here, at any time a transmission of the angle of rotation of the crankshaft occurs, in which a 720° angle of rotation of the crankshaft φK is transmitted into a 360° angle of rotation of the camshaft φN. Therefore, through this coupling the two angles of rotation are constant in reference to one another. In most applications, this fixed coupling of crankshaft and camshaft results in a ratio of
However, the operational characteristics of an internal combustion engine can be optimized, particularly with regard of fuel consumption, exhaust emission, and running performance, when the system of camshaft and crankshaft, coupled via the primary drive, can be modified.
DE 100 38 354 A1 discloses an arrangement for adjusting the angle of rotation of a camshaft relative to a crankshaft using a wobble plate mechanism. Here, a second drive additionally acts on the camshaft via a wobble plate mechanism, which is arranged between the camshaft phasing gear and the camshaft. This causes the camshaft to be adjustable relative to the crankshaft.
SUMMARYThe objective of the invention is to provide a simple and cost effective adjustment device, by which the phase position between the camshaft and the crankshaft can be adjusted.
This objective is attained according to the invention. Here, the adjustment device is a component of an electronic circuit automatically adjusting the desired phase position either directly or indirectly via another parameter, with the circuit comprising a control device and a control path having a structure specified for that application.
The advantage of the invention lies in the fact that such an adjustment device, having such an electronic circuit, can adjust very quickly and precisely the desired value in the control path.
Advantageous further developments also result from the invention as further described below. Here, for example, the target value can be adjusted with the adjustment device even more quickly and more precisely by way of compensating variable disturbances, or by adjusting a cascading positioning or by way of a state control.
BRIEF DESCRIPTION OF THE DRAWINGSIn the following, the invention will be explained in greater detail using three exemplary embodiments shown in the figures. In the drawings:
In the present exemplary embodiment the effect of the variable disturbance of the crank shaft rotational speed z is not collected only when it effects the control variable, but is already used for the pre-adjustment of the adjustment member 3. For example, the rotational speed of the sprocket or the belt pulley can be determined from the rotational speed of the crankshaft. The rotational speed z can be related to a corresponding self-inducting voltage yR at the electric motor.
In
Here, a time controlled input value w(t) is entered in to a pre-filter 5. The pre-filter generates an output value uw(t) therefrom, which forms together with a value ur(t) created by a state control 6 an input value u(t) for the state differential equation 7. Furthermore, the actual value x(t0) at the time to is fed to the state differential equation 7. Using these values the state differential equation 7 calculates the state x(t). The state can be measured either directly or indirectly via a measuring device 8, with the measurement being able to influence the state control 6, which again influences the input value u(t) for the state differential equation 7. Additionally, the actual value x(t) can be fed to the output equation 9 for further processing, which then creates an output value y(t) for the control path 10. In the circuit shown, the control path 10 is formed by the state differential equation 7 and the output equation 9, which create the variable control. The control device 11, controlling the variable control, is essentially formed by the measuring device 8 and the state control 6. In the exemplary embodiment the control device 11 also includes the pre-filter 5.
All exemplary embodiments may be combined with one another in various ways depending on the particular application.
Claims
1. An electronically driven mechanical adjustment device for adjusting a phase position (φ) between a camshaft and a crankshaft, comprising an adjuster that is part of an electronic circuit, for automatically adjusting a desired phase position (φ) between the camshaft and the crankshaft, and the circuit including at least one loop, in which an output value is fed back to the input.
2. An adjustment device according to claim 1, wherein the electronic circuit includes a compensation for variable disturbances (2).
3. An adjustment device according to claim 1, wherein the electronic circuit includes several control loops, nested parallel in a cascading fashion, with at least one circuit being superordinate to another one.
4. Control device according to claim 1, wherein the circuit in which the adjustment device is arranged includes a state control (10, 11).
Type: Application
Filed: Jun 20, 2005
Publication Date: Oct 20, 2005
Applicant: AFT Atlas Fahrzeugtechnik GmbH (Werdohl)
Inventors: Dirk Neubauer (Nachrodt-Wiblingwerde), Detlef Axmacher (Iserlohn), Markus Wilke (Nurtingen), Massimiliano Gasparro (Halver), Frank Pachan (Dortmund), Lars Pfutzenreuter (Werdohl)
Application Number: 11/156,904