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Airflow estimation method and apparatus for internal combustion engine

一种内燃发动机、空气流量的技术，应用在测量装置、发动机控制、机器/发动机等方向，能够解决没有实际应用或经济上的可行性等问题

Inactive Publication Date: 2009-02-11
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, speed-density approaches with more complex engine applications such as cam phase change and / or variable valve lift capabilities have not been practical or economically viable

Method used

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  • Airflow estimation method and apparatus for internal combustion engine
  • Airflow estimation method and apparatus for internal combustion engine
  • Airflow estimation method and apparatus for internal combustion engine

Examples

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Embodiment Construction

[0012] Referring now to FIG. 1 , a schematic model of a spark ignition internal combustion engine system (simply referred to as the system) 20 is shown. The system 20 includes, in the most general sense, all engine-related devices affecting or being affected by the gas mass flow and includes the operating environment or atmosphere from which the gas mass flows or to which it flows. The internal combustion engines include naturally aspirated or supercharged internal combustion engines. The atmospheric air 66 is shown entering the system at the fresh air inlet 22 .

[0013] The system includes a plurality of pneumatic components, each typically configured with at least one pair of ports through which a gas mass can flow. For example, an air intake comprising a fresh air inlet 22, an air cleaner 24 and an air intake duct 26 is a first general pneumatic element having a port generally corresponding to said air inlet 22 at one end and a general The ground corresponds to the other...

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PUM

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Abstract

A method of estimating an air charge in at least one combustion cylinder of an internal combustion engine includes calculating cylinder mass air flow based upon a modified volumetric efficiency parameter; and calculating the intake throttle mass air flow based upon a throttle air flow discharge parameter and a fuel enrichment factor. Three models including a mean-value cylinder flow model, a manifold dynamics model, and a throttle flow model are provided to estimate the air charge in the at least one combustion cylinder and to control delivery of fuel to the fuel delivery system.

Description

technical field [0001] The invention relates to the field of engine control of internal combustion engines, and in particular to the estimation of throttle air mass flow used in this control. Background technique [0002] The basic purpose of fuel metering in most gasoline engine applications is to track the amount of air in the cylinder at a predetermined stoichiometric ratio. Therefore, accurate air charge estimation is a critical preprocessing procedure for any viable open-loop fuel control strategy in such engine applications. Since the air charge cannot be measured directly, in some approaches its estimation relies on sensing information including an intake manifold pressure sensor, a mass air flow sensor upstream of the throttle plate, or both. The choice of a particular sensor configuration reflects a compromise between final system cost and minimum performance requirements. Currently, high-cost solutions comprising two sensors are appearing in markets with strict e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/18G01M99/00
CPCF02D41/18F02D2200/0406
Inventor R·C·特林R·章张曼锋
Owner GM GLOBAL TECH OPERATIONS LLC
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