Cylinder recharging strategies for cylinder deactivation
A cylinder deactivation, cylinder technology, applied in the field of cylinder recharge strategy for cylinder deactivation, can solve the problems of pollution, lubricant pull-in, etc.
Inactive Publication Date: 2018-10-23
EATON INTELLIGENT POWER LIMITED
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Problems solved by technology
Negative pressure can pull excess lubricant into the cylinder and create contamination
Method used
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[0023] Reference will now be made in detail to the examples shown in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Directional references such as "left" and "right" are for ease of reference to the drawings. Phrases such as "upward" and "downward" are used to aid in the directionality of flow from a fluid input point to a fluid output point. Fluids in the present disclosure may comprise a variety of constituents, including fresh or ambient air, exhaust, other combustion gases, boil-off fuel, and the like. Lubricating fluids such as oil or synthetic lubricants are inherently flammable, but should be considered part of a fluid circuit separate from the combustion circuit without incidental cross-contamination. The present disclosure focuses primarily on diesel engine operation, but the principles of the present disclosure may be applied to other fueled engines and engine systems...
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A multiple-cylinder diesel engine system comprises an intake valve and an exhaust valve for each of the multiple cylinders. A valve control system is connected to selectively deactivate an intake valve and an exhaust valve for a selected cylinder. A fuel injection control system is connected to selectively deactivate fuel injection to the selected cylinder while increasing fuel to firing cylinders. The multiple cylinder diesel engine enters a cylinder deactivation mode whereby the valve control system deactivates the intake valve and the exhaust valve and the fuel injection control system deactivates the fuel injection to the cylinder while continuing to fire other cylinders of the multiple cylinder diesel engine. The valve control system selectively opens the deactivated intake valve to relieve a negative pressure condition in the deactivated cylinder. Alternatively, the valve control system opens the deactivated exhaust valve to relieve a negative pressure condition in the deactivated cylinder.
Description
technical field [0001] The present application relates to cylinder deactivation of multi-cylinder diesel engines and provides methods and systems for managing cylinder pressure and lubrication systems. Background technique [0002] Cylinder deactivation (CDA) is distinct from cylinder cutoff. Cylinder cutoff cuts off fuel to the cylinders, but continues to cycle the cylinder valves and pistons. Cylinder cut-off is an inefficient energy drain. [0003] Cylinder deactivation stops valve movement and fuel injection to the cylinders. The piston continues to cycle. A certain amount of fluid is trapped in the cylinder, but is liable to leak out. Leaks can cause negative pressure. Negative pressure can pull excess lubricant into the cylinder and create contamination. Contents of the invention [0004] The systems and methods disclosed herein overcome the above disadvantages and improve current technology. Strategies include both cylinder pressure management and lubricatio...
Claims
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IPC IPC(8): F02D13/06F02D13/02F02D41/00F01L13/00
CPCF01L1/053F01L1/344F01L13/0005F01L13/065F01L2001/0537F01L2001/186F01L2013/001F01L2250/04F01L2800/10F01L2820/042F02B3/06F02D13/06F02D35/024F02D41/0007F02D41/0087F02D2041/0012F02D2250/08F02D2400/02F02M26/05F01L9/20Y02T10/12F01L2820/04
Inventor 小詹姆斯·麦卡锡道格拉斯·尼尔森
Owner EATON INTELLIGENT POWER LIMITED