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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.

Active Publication Date: 2008-03-19
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods ignore engine torque at low engine torque and have a negative impact on fuel economy
Also, these methods have a negative impact on noise, vibration and rough work at high engine torque

Method used

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  • Cylinder deactivation torque limit for noise, vibration, and harshness
  • Cylinder deactivation torque limit for noise, vibration, and harshness
  • Cylinder deactivation torque limit for noise, vibration, and harshness

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Embodiment Construction

[0014] The following description is exemplary only in nature and is not intended to limit the scope, application or usage of the invention. It should be understood that throughout the drawings, corresponding reference characters indicate like or corresponding parts and features. As used herein, communication refers to operation using all engine cylinders. Deactivation refers to operation using less than all engine cylinders (one or more cylinders are not activated). As used herein, the term module refers to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated or grouped) and memory, combinational logic circuits and / or Or other suitable elements that can provide the described functions.

[0015] Referring now to FIG. 1 , a vehicle 10 includes an engine 12 for driving a transmission 14 . The transmission 14 is an automatic or manual transmission driven by the engine 12 through a corresponding torque converter or clutch 16 . ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D17/00
CPCF02D41/0087F02D17/02
Inventor K·C·王A·E·小斯皮查W·R·文纳三世
Owner GM GLOBAL TECH OPERATIONS LLC
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