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Estimation of the exhaust pressure of a vehicle

An exhaust pressure, vehicle technology, applied in the field of vehicle exhaust pressure estimation, can solve problems such as inability to implement and provide guidance

Active Publication Date: 2012-11-07
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the document cannot provide guidance on the implementation of such a model

Method used

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  • Estimation of the exhaust pressure of a vehicle
  • Estimation of the exhaust pressure of a vehicle
  • Estimation of the exhaust pressure of a vehicle

Examples

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Embodiment Construction

[0040] The invention provides a simple and effective method for estimating the instantaneous exhaust pressure of a vehicle engine. It is known that the engine is connected to an exhaust gas collector. The vehicle is usually a motor vehicle. In particular, the engine may be a gasoline heat engine. The engine can be supercharged or naturally aspirated. The engine may have three, four, or six cylinders, or another number of cylinders. The vehicle includes at least one camshaft that controls intake and exhaust valves. The vehicle may include a camshaft for the intake valve and a camshaft for the exhaust valve, or a single shaft that performs both functions. The vehicle may also include or not include phase adjusters for the camshaft, intake shaft, and / or exhaust shaft. The vehicle may or may not include an EGR (exhaust gas recirculation) device and / or an IAE (to be exhausted air injection) device.

[0041] The method of the present invention will be described below through spec...

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Abstract

The invention relates to a method for estimating the instantaneous exhaust pressure of a vehicle engine, the engine being connected to an exhaust manifold, the vehicle including at least one camshaft controlling intake and exhaust valves. The method is characterized in that it includes the steps of determining an engine speed and a total gas fill in the exhaust; calculating intermediate pressure ratios from mappings having the engine speed and the total fill as inputs; calculating an overall pressure ratio via interpolation of the intermediate pressure ratios; and multiplying the overall pressure ratio by a reference exhaust pressure, the product of the multiplication determining the instantaneous exhaust pressure. The method enables simple and efficient estimation of the instantaneous exhaust pressure of a vehicle engine.

Description

[0001] The present invention claims the priority of French patent application 1051305 filed on February 24, 2010, the content (text, drawings, and claims) of which are incorporated herein by reference. Technical field [0002] The invention relates to a method for estimating the instantaneous exhaust pressure of a vehicle engine. Background technique [0003] The instantaneous exhaust pressure is a parameter that can be used to improve the accuracy of the estimation model of the engine's fresh air filling amount. The estimated value of the fresh air filling amount is especially one of the main estimated values ​​for testing engine characteristics. [0004] Integrating the pressure sensor in the exhaust line of the vehicle in order to measure the instantaneous exhaust pressure is costly and requires very important adaptation to the exhaust line. Therefore, an alternative solution for determining the instantaneous exhaust pressure is desired. [0005] The patent document FR-A-2919388 ...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D41/24
CPCF02D2041/1433F02D41/0007F02D2041/001Y02T10/144F02D41/2422F02D41/145F02D41/2416Y02T10/12Y02T10/40
Inventor F·特雷勒P·奎伊
Owner PEZHO SITROEN AUTOMOBILS SA
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