Cylinder deactivation torque limit for noise, vibration, and harshness

A rough working, cylinder technology used in electrical control, engine control, machine/engine, etc. to solve problems such as negative fuel economy effects, neglect of engine torque, etc.
CN101144433AActive Publication Date: 2008-03-19GM GLOBAL TECH OPERATIONS LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GM GLOBAL TECH OPERATIONS LLC
Publication Date
2008-03-19

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Abstract

An engine control system is provided for controlling transitions of an engine between an activated mode in which all cylinders are activated and a deactivated mode in which less than all cylinders are activated. The system includes: a noise, vibration and harshness (NVH) limit module that determines a noise, vibration and harshness (NVH) torque limit based on engine speed and vehicle speed; A mode shift module that transitions the engine between active and inactive modes while noise, vibration, and rough operation.
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Description

technical field

[0001] The present invention relates to methods and systems for displacement-on-demand 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] Some internal combustion engines include engine control systems that deactivate one or more cylinders during operation. This deactivation generally occurs under low load conditions. For example, an 8-cylinder engine can be run with 4 cylinders to improve fuel economy by reducing pumping losses. This process is commonly referred to as displacement on demand or DOD. Operation in which all engine cylinders are used is called the active mode. Deactivated mode refers to operation using less than all engine cylinders (one or more cylinders are not activated).

[0004] The traditional method of controlling the transition of an engine between an active mode and a deactivated ...

Claims

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