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Method and apparatus for continuously variable differential phasing of engine valve operation

A phase adjustment, engine technology, applied in the direction of combustion engine, engine control, engine components, etc., can solve the problem of lack of continuous cam phase adjustment

Active Publication Date: 2012-08-29
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known LIVC systems may have limited advantages when using independent two-position switching mechanisms and lacking continuous cam phasing

Method used

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  • Method and apparatus for continuously variable differential phasing of engine valve operation
  • Method and apparatus for continuously variable differential phasing of engine valve operation
  • Method and apparatus for continuously variable differential phasing of engine valve operation

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Embodiment Construction

[0035] Referring now to the drawings, in which certain exemplary embodiments are depicted for purposes of illustration only and not for purposes of limitation, figure 1 An internal combustion engine 10 and an accompanying control module 5 are schematically shown. Engine 10 is selectively operative in a controlled auto-ignition combustion mode, a homogeneous spark-ignition combustion mode, and a stratified-charge spark-ignition combustion mode.

[0036] Exemplary engine 10 includes a multi-cylinder direct injection four-stroke internal combustion engine having reciprocating pistons 14 slidably movable within cylinders 15 which define a variable volume combustion chamber 16 . Each piston 14 is connected to a rotating crankshaft 12 by which the linear reciprocating motion of the pistons 14 is converted into rotary motion. An air intake system provides intake air to an intake manifold 29 which directs and distributes the air into intake air ducts leading to each combustion chambe...

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PUM

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Abstract

An internal combustion engine includes a crankshaft and first and second cam actuated intake valves. A method for operating the engine includes providing a first intake cam configured to actuate the first cam actuated intake valve, and providing a second intake cam configured to actuate the second cam actuated intake valve. The second intake cam is phase adjustable relative to the crankshaft independently of the phase of the first intake cam relative to the crankshaft. A controller is provided and configured to selectively retard the phase of the second intake cam to effect later closing of the second cam actuated intake valve sufficiently to reduce the effective compression ratio of the engine. Additionally, the first intake cam may be phase adjustable relative to the crankshaft independently of the phase of the second intake cam relative to the crankshaft and the controller may additionally be configured to selectively advance the phase of the first intake cam to effect earlier opening of the first cam actuated intake valve sufficiently to increase internal exhaust gas recirculation.

Description

technical field [0001] The invention relates to the control of engine valves of internal combustion engines. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Internal combustion engines, especially automotive internal combustion engines, are generally divided into two categories, namely spark ignition engines and compression ignition engines. Known spark ignition engines, such as gasoline engines, operate by introducing a fuel / air mixture into a combustion cylinder, which is then compressed during the compression stroke and ignited by a spark plug. Known compression ignition engines, such as diesel engines, operate by introducing or injecting pressurized fuel into a combustion cylinder near top dead center (TDC) of the compression stroke, where the fuel combusts as it is injected. Combustion in known gasoline and diesel engines involves a premixed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/34F02D13/02F02D45/00
CPCF02D13/0207Y02T10/18F01L2001/0537F02D13/0257F01L2001/0473Y02T10/12
Inventor D·J·克莱里P·M·纳特C·D·马里奥特J·昌
Owner GM GLOBAL TECH OPERATIONS LLC