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Variable valve timing for large-sized two-stroke diesel engine with camshaft

A diesel engine, two-stroke technology, applied to engine components, combustion engines, machines/engines, etc.

Active Publication Date: 2011-09-21
曼能解决方案(曼能解决方案德国股份公司)分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the overall fuel efficiency of these conventional two-stroke diesel engines is almost the same as that of an electronically controlled variable valve timing engine, although conventional two-stroke diesel engines have somewhat poorer combustion efficiency

Method used

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  • Variable valve timing for large-sized two-stroke diesel engine with camshaft
  • Variable valve timing for large-sized two-stroke diesel engine with camshaft
  • Variable valve timing for large-sized two-stroke diesel engine with camshaft

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Embodiment Construction

[0024] figure 1 is a cross-sectional view through one of the cylinders 1 of the engine according to the preferred embodiment of the invention, seen from the front of the engine. The engine is a turbocharged, single-flow, low-speed, two-stroke crosshead diesel engine, which may be a propulsion engine in a ship or a prime mover in a power plant. These engines typically have 3 to 14 in-line cylinders.

[0025] Pistons 2 are housed within cylinder 1 and together define a combustion chamber 3 . A piston rod 4 connects the piston 2 to a crosshead (not shown). The cylinder 1 is of the uniflow type and is provided with a scavenging port 5 at its lower end and an exhaust valve 6 at its top. Cylinder 1 receives air from a scavenging receiver (not shown) which is supplied with scavenging air supercharged by a turbocharger (not shown).

[0026] The camshaft 7 extends along the length of the engine. Camshaft 7 is made into one with exhaust cam, indicator cam, thrust disc and sprocket ...

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Abstract

The present invention relates to a large-sized two-stroke diesel engine with hydraulic push rod type camshaft for driving the exhaust valve actuating system. The hydraulic push rod is connected to a cThe present invention relates to a large-sized two-stroke diesel engine with hydraulic push rod type camshaft for driving the exhaust valve actuating system. The hydraulic push rod is connected to a capacity control apparatus, which is capable of absorbing proper hydraulic liquid from the hydraulic push rod under the instruction of an electronic control unit. The capacity control apparatus comprisapacity control apparatus, which is capable of absorbing proper hydraulic liquid from the hydraulic push rod under the instruction of an electronic control unit. The capacity control apparatus comprises an elastically offset control piston limiting a capacity control chamber. The characteristic of the control piston can be affected by the electronic control unit by a hydraulic valve, the hydraulices an elastically offset control piston limiting a capacity control chamber. The characteristic of the control piston can be affected by the electronic control unit by a hydraulic valve, the hydraulic valve selectively connects the control chamber limited by the control piston to a hydraulic energy accumulator.valve selectively connects the control chamber limited by the control piston to a hydraulic energy accumulator.

Description

technical field [0001] The present invention relates to a large two-stroke diesel engine with camshaft-operated exhaust valves, and in particular to a large two-stroke diesel engine with camshaft-operated exhaust valves with variable timing. Background technique [0002] High fuel efficiency and low emissions are extremely important design aspects of large two-stroke diesel engines. In the past, attempts have been made to improve the fuel efficiency of these engines by applying exhaust valve actuation systems with electronically controlled variable valve timing. Typically, these known variable timing valve actuation systems operate using a source of high pressure hydraulic fluid, such as a pump station, and a hydraulic valve system that controls the hydraulic flow to a corresponding hydraulic exhaust valve actuator. High pressure hydraulic fluid powers the exhaust valve actuator which opens the exhaust valve against the pressure in the combustion chamber and the air spring ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/34F01L9/02
CPCF01L1/34F01L2001/34426F01L9/10Y02T10/12
Inventor 波尔·岑克
Owner 曼能解决方案(曼能解决方案德国股份公司)分公司