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Exhaust valve actuator for large-scale two-stroke diesel engine

An actuator and exhaust valve technology, applied in the direction of engine components, machines/engines, non-mechanically actuated valves, etc., can solve problems such as large hydraulic energy of exhaust valves, fuel saving losses, etc.

Inactive Publication Date: 2009-08-19
曼柴油机和涡轮公司,德国曼柴油机和涡轮欧洲股份公司的联营公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydraulic energy used to open the exhaust valves on large two-stroke diesel engines is considerable, and a significant portion of the fuel savings gained by improving the combustion control of electronically controlled engines is lost in the actuation of the exhaust valves

Method used

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  • Exhaust valve actuator for large-scale two-stroke diesel engine
  • Exhaust valve actuator for large-scale two-stroke diesel engine
  • Exhaust valve actuator for large-scale two-stroke diesel engine

Examples

Experimental program
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Embodiment Construction

[0033] The exhaust valve actuator according to the invention is used to actuate the exhaust valves of a low speed two-stroke diesel engine (not shown), which may be a propulsion engine in a ship or a prime mover in a power plant. These engines typically have 6-16 cylinders and the bore can exceed 1m. The exhaust valves are correspondingly large and can weigh up to 400kg or more. These turbocharged engines range in engine power from 100,000kW (for the largest models) to 1600kW (for the smaller models).

[0034] The operation of the exhaust valve according to the invention is electronically controlled, ie an electronic signal from an electronic control unit determines when the exhaust valve opens and when it closes. The electronic control unit receives signals from sensors that determine the angular position of the crankshaft. The engine thus does not require a camshaft to operate the exhaust valves.

[0035]The exhaust valves are opened and closed by means of exhaust valve a...

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PUM

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Abstract

The invention relates to an exhaust valve actuator for large-scaled two-stroke diesel motor that is able to move between a closed position and an open position along opposite directions. The actuator includes a bidirectional hydraulic piston including a hydraulic closed chamber and a hydraulic open chamber. The bidirectional spring component is connected to the bidirectional piston and forms a mass spring system with the mandrel of exhaust valve actuator and any other mass of the component that accordantly moves therewith. The bidirectional spring component stores energy when the exhaust valve actuator reciprocally moves between the closed position and the open position so as to push the exhaust valve actuator along the opposite direction. An open / closed hydraulic valve alternatively connects the hydraulic closed chamber to a high pressure source and connects a hydraulic open chamber to an oil cylinder, or on the contrary. When the exhaust valve actuator is in an open position and when an electronically controlled hydraulic valve connects the hydraulic open chamber to a high pressure hydraulic fluid source, the closing force of the bidirectional spring and the opening force of the hydraulic open chamber are balanceable.

Description

technical field [0001] The present invention relates to an exhaust valve actuator for a large two-stroke diesel engine of the crosshead type, and in particular to a fluid operated and electronically controlled exhaust valve actuator. Background technique [0002] Large two-stroke engines of the crosshead type, commonly used in the propulsion systems of large ships or as prime movers in power plants, have recently evolved from camshaft-controlled engines to electronically-controlled engines. Electronic controls provide greater flexibility for timing and shaping of fuel injection and exhaust valves. The combustion process is thus better controlled, resulting in more efficient combustion and lower emission values ​​allowing smoke-free operation at all operating speeds, reducing part load fuel consumption and lowering minimum operating speeds. CN1485530 (CN is submitting), JP2004-084670 (JP is submitting), KR2004-20003 (KR is submitting) discloses a large electronically control...

Claims

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Application Information

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IPC IPC(8): F01L9/02F01L1/46
CPCF01L1/08
Inventor 芬·考助普·延森
Owner 曼柴油机和涡轮公司,德国曼柴油机和涡轮欧洲股份公司的联营公司
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