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Mass air flow estimation based on manifold absolute pressure

a mass air flow and absolute pressure technology, applied in the direction of machines/engines, electrical control, instruments, etc., can solve the problems of inaccurate estimation of maf, less accurate than desired, and relatively expensive maf sensors

Inactive Publication Date: 2006-03-30
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] Accordingly, the present invention provides a control system that determines a mass air flow through a throttle of an internal combustion engine (ICE) having an intake manifold. The control system includes a calculator that calculates an estimated mass air flow based on a throttle position and an a

Problems solved by technology

MAF sensors, however, are relatively expensive as compared to other sensors implemented with the ICE.
Although the conventional techniques eliminate the need for a MAF sensor, they are less accurate than desired.
These inaccuracies result from an incorrect estimation of MAF during throttle transient conditions.
More specifically, air flow pulsations that occur as the ICE draws air into the cylinders and delays in processing sensor information result in such cycle-to-cycle variations.

Method used

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  • Mass air flow estimation based on manifold absolute pressure
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  • Mass air flow estimation based on manifold absolute pressure

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Embodiment Construction

[0015] The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements. As used herein, the term module and / or device refers to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, or other suitable components that provide the described functionality.

[0016] Referring now to FIG. 1, a vehicle 10 includes an internal combustion engine 12 having an intake manifold 14. A throttle 16 regulates air flow into the intake manifold 14. More particularly, a throttle blade 18 is articulated based on a driver input (not shown) to regulate air flow through the throttle 16. The intake manifold 14 directs air flow into cylinders 20 of t...

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Abstract

A control system that determines a mass air flow through a throttle of an internal combustion engine (ICE) having an intake manifold includes a calculator that calculates an estimated mass air flow based on a throttle position and an adjustment module that determines an adjustment value. The adjustment value is based on the estimated mass air flow, an estimated manifold absolute pressure and a measured manifold absolute pressure. A multiplier multiplies the estimated mass air flow by the adjustment value to determine the mass air flow.

Description

FIELD OF THE INVENTION [0001] The present invention relates to estimating mass air flow through a throttle of a vehicle, and more particularly to estimating mass air flow based on manifold absolute pressure. BACKGROUND OF THE INVENTION [0002] Internal combustion engines (ICE's) are controlled based on a manifold absolute pressure (MAP) and mass air flow (MAF) signals that are generated by MAP and MAF sensors, respectively. A controller controls emissions and engine performance characteristics of the ICE based on the MAP and MAF signals. For example, critical engine parameters, such as air-to-fuel (A / F) ratio, can be adjusted by knowing the mass of air available for combustion. [0003] MAF sensors are commercially available and have been used with ICE's to provide the required MAF information. MAF sensors, however, are relatively expensive as compared to other sensors implemented with the ICE. Therefore, alternative techniques for determining MAF into the ICE have developed. Two conve...

Claims

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Application Information

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IPC IPC(8): F02D45/00G06F19/00G01M19/00G01M99/00
CPCF02D41/18F02D2200/0402F02D2200/0404G01F1/86F02D2200/0408G01F1/34F02D2200/0406
Inventor MLADENOVIC, LJUBISA M.BUSLEPP, KENNETH J.TROMBLEY, DOUGLAS E.
Owner GM GLOBAL TECH OPERATIONS LLC