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Lost motion variable valve actuation system for engine braking and early exhaust opening

A technology of engine braking and exhaust valves, applied in engine control, engine components, machines/engines, etc.

Active Publication Date: 2012-04-11
JACOBS VEHICLE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, lost motion VVA systems that provide early valve opening and spilled oil near peak lift have the risk of increased valve-piston contact if the relief, which may occur, for example, due to a clogged relief hole or a broken valve spring, is ineffective

Method used

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  • Lost motion variable valve actuation system for engine braking and early exhaust opening
  • Lost motion variable valve actuation system for engine braking and early exhaust opening
  • Lost motion variable valve actuation system for engine braking and early exhaust opening

Examples

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Embodiment Construction

[0038] Reference will now be made in detail to the embodiments of the invention, examples of which are illustrated in the accompanying drawings. Embodiments of the present invention may be used to provide variable valve actuation for compression-release engine braking and brake gas recirculation during engine braking mode of engine operation, as well as early exhaust during positive power mode of engine operation The door opens.

[0039] figure 1 is a block diagram showing the valve actuation system 100 according to the first embodiment of the present invention. The valve actuation system 100 may include a first motion imparting device 102, such as a cam having one or more raised portions or protrusions, which operably contacts a lost motion system 104, which in turn may be operably connected to One or more engine valves 106 . The valve actuation system may also include a second motion imparting device 103 operatively connected to the one or more engine valves 106 . It sho...

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PUM

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Abstract

A method and system for actuating an internal combustion engine exhaust vaive to provide compression release actuation during an engine braking mode of engine operation and early exhaust valve opening actuation during a positive power mode of engine operation is disclosed. The system may include a first cam having a compression release lobe and an early exhaust valve opening lobe connected to a hydraulic lost motion system including a first rocker arm. A hydraulically actuated piston may be selectively extended from the hydraulic lost motion system to provide the exhaust valve with compression release actuation or early exhaust valve opening actuation. The hydraulicaily actuated piston may be provided as a slave piston in a master-slave piston circuit in a fixed housing, or alternatively, as a hydraulic piston slidably disposed in a rocker arm. The method and system may further provide exhaust gas recirculation and / or brake gas recirculation in combination with compression release actuation and early exhaust valve opening actuation.

Description

technical field [0001] The present invention generally relates to a system for actuating one or more engine valves of an internal combustion engine. In particular, the present invention relates to a lost motion system for providing variable valve actuation (VVA) to engine braking and early exhaust opening (EEO). Background technique [0002] Internal combustion engines typically actuate the engine valves using mechanical, electric, or hydro-mechanical valve actuation systems. These systems may include combinations of pushrods, camshafts, and rocker arms that are rotationally driven by the engine crankshaft. When a camshaft is used to actuate engine valves, the timing of valve actuation may be fixed by the size and location of a raised portion on the camshaft. [0003] Every time the camshaft rotates 360 degrees, the engine completes a full cycle consisting of four strokes, namely expansion, exhaust, intake and compression. The intake and exhaust valves can be closed and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D13/04F01L1/34F01L1/18
CPCF01L13/06F01L13/065F01L2001/467F01L1/181F01L1/08F02D13/04
Inventor J·A·施沃布尔
Owner JACOBS VEHICLE SYST
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