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System and method for estimating volumetric efficiency for engines with intake and exhaust cam phasers

A technology of cam phaser and exhaust cam, which is applied in the direction of machine/engine, combustion engine, engine control, etc. It can solve the problems of reducing accuracy, increasing calibration work and time for mathematical relations, etc.

Active Publication Date: 2009-03-11
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mathematical relationships often increase calibration effort and time
also reduces accuracy

Method used

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  • System and method for estimating volumetric efficiency for engines with intake and exhaust cam phasers
  • System and method for estimating volumetric efficiency for engines with intake and exhaust cam phasers
  • System and method for estimating volumetric efficiency for engines with intake and exhaust cam phasers

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Embodiment Construction

[0024] The following descriptions of preferred embodiments are merely illustrative in nature and in no way limit the invention and its application or use. For simplicity, the same reference numbers are used in the drawings to refer to similar elements. As used herein, the term module refers to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated or group) and memory, a combinational logic circuit that executes one or more software or firmware programs Or other suitable components that provide the described functionality.

[0025] The present disclosure uses a look-up table to determine the VE for which the cam phaser is in the "park" position. Mathematical functions are then used to represent the intake and exhaust cam phaser effects. The mathematical function may be based on engine speed, load, intake camshaft position, exhaust camshaft position, and / or other sensed or modeled variables. Since the mathematical function on...

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Abstract

The invention provides a system and method for estimating engine volumetric efficiency with intake and exhaust cam phaser. An engine control module comprises a table that outputs a parked VE estimate based on an input parameter when intake and exhaust cam phasers of an engine are in a parked position. A calculation module calculates VE estimate when the intake and exhaust cam phasers are not in a parked position based on the parked VE estimate and a mathematical relationship.

Description

[0001] This application claims priority to US Provisional Application No. 60 / 961,546, filed July 20, 2007. The content of the above application is incorporated herein by reference. technical field [0002] The present invention relates to engine control systems, and more particularly to engine control systems for engines having intake and exhaust cam phasers. Background technique [0003] The contents in this section merely provide background information related to the present disclosure and may not constitute prior art. [0004] In a four-stroke unsupercharged engine, the theoretical maximum amount of air that can be drawn into each cylinder during the intake cycle is equal to the cylinder's working volume. Since each cylinder has an intake stroke every two revolutions of the crankshaft, the theoretical maximum amount of air drawn in during each revolution of the crankshaft is equal to half its displacement. The actual amount of air taken in by the engine compared to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00
CPCF02D2200/0411Y02T10/18F02D41/18F02D2041/001F02D2200/0402F02D13/0219F02D41/1458Y02T10/12
Inventor L·K·维金斯K·P·杜德克J·迈尔Y·G·京岑内克
Owner GM GLOBAL TECH OPERATIONS LLC