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Control arrangement for a valve operating assembly and a method for controlling the closing movement of a valve operating assembly

A control device, valve operation technology, applied to valve devices, non-mechanically actuated valves, engine components, etc., to achieve the effect of efficient and stable operation and reliable structure

Active Publication Date: 2011-09-21
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However at a later stage the connection is re-established, but this must happen slowly enough to ensure smooth operation and prevent damage to the components involved

Method used

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  • Control arrangement for a valve operating assembly and a method for controlling the closing movement of a valve operating assembly
  • Control arrangement for a valve operating assembly and a method for controlling the closing movement of a valve operating assembly
  • Control arrangement for a valve operating assembly and a method for controlling the closing movement of a valve operating assembly

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Embodiment Construction

[0016] figure 1 A schematic diagram of a piston engine 1 is shown to the extent relevant for understanding the invention. Gas exchange of cylinders (not shown) in the piston engine 1 is performed under the control of gas exchange valves (ie, intake and exhaust valves) located on the cylinder head 2 . Only the intake valves 3 are shown and they are operated by a valve train 6 which is normally guided by a cam profile of a cam arrangement 5 arranged on a camshaft 4 of the engine. The force-transmitting connection between each valve gear 6 and the corresponding cam gear 5 is realized via a control device 7 .

[0017] exist Figure 2 to Figure 6 The control device 7 is shown in more detail in . The control device 7 comprises a body portion 8 which is usually attached to the engine block. A piston device 9 is movably arranged in the body part 8 . The upper end of the piston arrangement 9 is arranged in force transmission connection with the valve train 6 (not shown closer). T...

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PUM

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Abstract

A control arrangement for, and a method for controlling the closing movement of, a valve operating assembly in a piston engine adapted between a cam device (5) of a camshaft (4) of the engine (1 ) and an inlet valve mechanism (6) arranged to open and close the inlet valve (3) in association with a cylinder of the engine. The control arrangement (7) comprises a body part (8), in which a piston de not vice (9) is movably arranged to be in force transmission connection with the camshaft (4) and the valve mechanism (6), the body part (8) and the piston device (9) together defining a first chamber(13), into which hydraulic medium can be selectively fed for providing a delay in the closing of the inlet valve (3). The body part (8) is provided with a first duct (16) for releasing of pressure inthe first chamber (13) under control of a gu ide member (10) movably arranged in the body part (8) between the cam device (5) and the piston device (9). The guide member (10) includes a third chamber(18), which is arranged to be in communication with the first duct (16) and a control piston (20) located in said third chamber (18) and movably arranged with regard to the guide member (10) for controlling pressure medium flow through said third chamber (18).

Description

technical field [0001] The invention relates to a control device for a valve operating assembly in a piston engine according to the preamble of claim 1 and a method for controlling the closing movement of a valve operating assembly in a piston engine according to the preamble of claim 6 . Background technique [0002] In the operation of a four-stroke internal combustion engine there are situations where during the compression stroke the cylinder does not have enough air for self-ignition to occur. This situation is especially likely to occur during engine starting and during load changes. One solution is to provide delayed closing of the intake valves to prolong the opening time of the intake valves when required. An example of such a variable intake valve closing (VIC) arrangement is disclosed in patent publication WO2008 / 000899. [0003] When the delay function is used during the closing phase of the intake valve, the valve lifter element is temporarily not directly co...

Claims

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Application Information

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IPC IPC(8): F01L9/02F01L1/255F01L1/14F01L9/14
CPCF01L1/16F01L2013/0089F01L1/146F01L9/025F01L1/255F01L9/14
Inventor 马格努斯·松德斯滕
Owner WARTSILA FINLAND OY